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Diffstat (limited to 'libxml2/xpath.c')
| -rw-r--r-- | libxml2/xpath.c | 15392 |
1 files changed, 15392 insertions, 0 deletions
diff --git a/libxml2/xpath.c b/libxml2/xpath.c new file mode 100644 index 0000000..113bce6 --- /dev/null +++ b/libxml2/xpath.c @@ -0,0 +1,15392 @@ +/* + * xpath.c: XML Path Language implementation + * XPath is a language for addressing parts of an XML document, + * designed to be used by both XSLT and XPointer + *f + * Reference: W3C Recommendation 16 November 1999 + * http://www.w3.org/TR/1999/REC-xpath-19991116 + * Public reference: + * http://www.w3.org/TR/xpath + * + * See Copyright for the status of this software + * + * Author: daniel@veillard.com + * + */ + +#define IN_LIBXML +#include "libxml.h" + +#include <string.h> + +#ifdef HAVE_SYS_TYPES_H +#include <sys/types.h> +#endif +#ifdef HAVE_MATH_H +#include <math.h> +#endif +#ifdef HAVE_FLOAT_H +#include <float.h> +#endif +#ifdef HAVE_CTYPE_H +#include <ctype.h> +#endif +#ifdef HAVE_SIGNAL_H +#include <signal.h> +#endif + +#include <libxml/xmlmemory.h> +#include <libxml/tree.h> +#include <libxml/valid.h> +#include <libxml/xpath.h> +#include <libxml/xpathInternals.h> +#include <libxml/parserInternals.h> +#include <libxml/hash.h> +#ifdef LIBXML_XPTR_ENABLED +#include <libxml/xpointer.h> +#endif +#ifdef LIBXML_DEBUG_ENABLED +#include <libxml/debugXML.h> +#endif +#include <libxml/xmlerror.h> +#include <libxml/threads.h> +#include <libxml/globals.h> +#ifdef LIBXML_PATTERN_ENABLED +#include <libxml/pattern.h> +#endif + +#include "buf.h" + +#ifdef LIBXML_PATTERN_ENABLED +#define XPATH_STREAMING +#endif + +#define TODO \ + xmlGenericError(xmlGenericErrorContext, \ + "Unimplemented block at %s:%d\n", \ + __FILE__, __LINE__); + +/** + * WITH_TIM_SORT: + * + * Use the Timsort algorithm provided in timsort.h to sort + * nodeset as this is a great improvement over the old Shell sort + * used in xmlXPathNodeSetSort() + */ +#define WITH_TIM_SORT + +/* +* XP_OPTIMIZED_NON_ELEM_COMPARISON: +* If defined, this will use xmlXPathCmpNodesExt() instead of +* xmlXPathCmpNodes(). The new function is optimized comparison of +* non-element nodes; actually it will speed up comparison only if +* xmlXPathOrderDocElems() was called in order to index the elements of +* a tree in document order; Libxslt does such an indexing, thus it will +* benefit from this optimization. +*/ +#define XP_OPTIMIZED_NON_ELEM_COMPARISON + +/* +* XP_OPTIMIZED_FILTER_FIRST: +* If defined, this will optimize expressions like "key('foo', 'val')[b][1]" +* in a way, that it stop evaluation at the first node. +*/ +#define XP_OPTIMIZED_FILTER_FIRST + +/* +* XP_DEBUG_OBJ_USAGE: +* Internal flag to enable tracking of how much XPath objects have been +* created. +*/ +/* #define XP_DEBUG_OBJ_USAGE */ + +/* + * XPATH_MAX_STEPS: + * when compiling an XPath expression we arbitrary limit the maximum + * number of step operation in the compiled expression. 1000000 is + * an insanely large value which should never be reached under normal + * circumstances + */ +#define XPATH_MAX_STEPS 1000000 + +/* + * XPATH_MAX_STACK_DEPTH: + * when evaluating an XPath expression we arbitrary limit the maximum + * number of object allowed to be pushed on the stack. 1000000 is + * an insanely large value which should never be reached under normal + * circumstances + */ +#define XPATH_MAX_STACK_DEPTH 1000000 + +/* + * XPATH_MAX_NODESET_LENGTH: + * when evaluating an XPath expression nodesets are created and we + * arbitrary limit the maximum length of those node set. 10000000 is + * an insanely large value which should never be reached under normal + * circumstances, one would first need to construct an in memory tree + * with more than 10 millions nodes. + */ +#define XPATH_MAX_NODESET_LENGTH 10000000 + +/* + * TODO: + * There are a few spots where some tests are done which depend upon ascii + * data. These should be enhanced for full UTF8 support (see particularly + * any use of the macros IS_ASCII_CHARACTER and IS_ASCII_DIGIT) + */ + +#ifdef XP_OPTIMIZED_NON_ELEM_COMPARISON +/** + * xmlXPathCmpNodesExt: + * @node1: the first node + * @node2: the second node + * + * Compare two nodes w.r.t document order. + * This one is optimized for handling of non-element nodes. + * + * Returns -2 in case of error 1 if first point < second point, 0 if + * it's the same node, -1 otherwise + */ +static int +xmlXPathCmpNodesExt(xmlNodePtr node1, xmlNodePtr node2) { + int depth1, depth2; + int misc = 0, precedence1 = 0, precedence2 = 0; + xmlNodePtr miscNode1 = NULL, miscNode2 = NULL; + xmlNodePtr cur, root; + long l1, l2; + + if ((node1 == NULL) || (node2 == NULL)) + return(-2); + + if (node1 == node2) + return(0); + + /* + * a couple of optimizations which will avoid computations in most cases + */ + switch (node1->type) { + case XML_ELEMENT_NODE: + if (node2->type == XML_ELEMENT_NODE) { + if ((0 > (long) node1->content) && /* TODO: Would a != 0 suffice here? */ + (0 > (long) node2->content) && + (node1->doc == node2->doc)) + { + l1 = -((long) node1->content); + l2 = -((long) node2->content); + if (l1 < l2) + return(1); + if (l1 > l2) + return(-1); + } else + goto turtle_comparison; + } + break; + case XML_ATTRIBUTE_NODE: + precedence1 = 1; /* element is owner */ + miscNode1 = node1; + node1 = node1->parent; + misc = 1; + break; + case XML_TEXT_NODE: + case XML_CDATA_SECTION_NODE: + case XML_COMMENT_NODE: + case XML_PI_NODE: { + miscNode1 = node1; + /* + * Find nearest element node. + */ + if (node1->prev != NULL) { + do { + node1 = node1->prev; + if (node1->type == XML_ELEMENT_NODE) { + precedence1 = 3; /* element in prev-sibl axis */ + break; + } + if (node1->prev == NULL) { + precedence1 = 2; /* element is parent */ + /* + * URGENT TODO: Are there any cases, where the + * parent of such a node is not an element node? + */ + node1 = node1->parent; + break; + } + } while (1); + } else { + precedence1 = 2; /* element is parent */ + node1 = node1->parent; + } + if ((node1 == NULL) || (node1->type != XML_ELEMENT_NODE) || + (0 <= (long) node1->content)) { + /* + * Fallback for whatever case. + */ + node1 = miscNode1; + precedence1 = 0; + } else + misc = 1; + } + break; + case XML_NAMESPACE_DECL: + /* + * TODO: why do we return 1 for namespace nodes? + */ + return(1); + default: + break; + } + switch (node2->type) { + case XML_ELEMENT_NODE: + break; + case XML_ATTRIBUTE_NODE: + precedence2 = 1; /* element is owner */ + miscNode2 = node2; + node2 = node2->parent; + misc = 1; + break; + case XML_TEXT_NODE: + case XML_CDATA_SECTION_NODE: + case XML_COMMENT_NODE: + case XML_PI_NODE: { + miscNode2 = node2; + if (node2->prev != NULL) { + do { + node2 = node2->prev; + if (node2->type == XML_ELEMENT_NODE) { + precedence2 = 3; /* element in prev-sibl axis */ + break; + } + if (node2->prev == NULL) { + precedence2 = 2; /* element is parent */ + node2 = node2->parent; + break; + } + } while (1); + } else { + precedence2 = 2; /* element is parent */ + node2 = node2->parent; + } + if ((node2 == NULL) || (node2->type != XML_ELEMENT_NODE) || + (0 <= (long) node2->content)) + { + node2 = miscNode2; + precedence2 = 0; + } else + misc = 1; + } + break; + case XML_NAMESPACE_DECL: + return(1); + default: + break; + } + if (misc) { + if (node1 == node2) { + if (precedence1 == precedence2) { + /* + * The ugly case; but normally there aren't many + * adjacent non-element nodes around. + */ + cur = miscNode2->prev; + while (cur != NULL) { + if (cur == miscNode1) + return(1); + if (cur->type == XML_ELEMENT_NODE) + return(-1); + cur = cur->prev; + } + return (-1); + } else { + /* + * Evaluate based on higher precedence wrt to the element. + * TODO: This assumes attributes are sorted before content. + * Is this 100% correct? + */ + if (precedence1 < precedence2) + return(1); + else + return(-1); + } + } + /* + * Special case: One of the helper-elements is contained by the other. + * <foo> + * <node2> + * <node1>Text-1(precedence1 == 2)</node1> + * </node2> + * Text-6(precedence2 == 3) + * </foo> + */ + if ((precedence2 == 3) && (precedence1 > 1)) { + cur = node1->parent; + while (cur) { + if (cur == node2) + return(1); + cur = cur->parent; + } + } + if ((precedence1 == 3) && (precedence2 > 1)) { + cur = node2->parent; + while (cur) { + if (cur == node1) + return(-1); + cur = cur->parent; + } + } + } + + /* + * Speedup using document order if availble. + */ + if ((node1->type == XML_ELEMENT_NODE) && + (node2->type == XML_ELEMENT_NODE) && + (0 > (long) node1->content) && + (0 > (long) node2->content) && + (node1->doc == node2->doc)) { + + l1 = -((long) node1->content); + l2 = -((long) node2->content); + if (l1 < l2) + return(1); + if (l1 > l2) + return(-1); + } + +turtle_comparison: + + if (node1 == node2->prev) + return(1); + if (node1 == node2->next) + return(-1); + /* + * compute depth to root + */ + for (depth2 = 0, cur = node2; cur->parent != NULL; cur = cur->parent) { + if (cur->parent == node1) + return(1); + depth2++; + } + root = cur; + for (depth1 = 0, cur = node1; cur->parent != NULL; cur = cur->parent) { + if (cur->parent == node2) + return(-1); + depth1++; + } + /* + * Distinct document (or distinct entities :-( ) case. + */ + if (root != cur) { + return(-2); + } + /* + * get the nearest common ancestor. + */ + while (depth1 > depth2) { + depth1--; + node1 = node1->parent; + } + while (depth2 > depth1) { + depth2--; + node2 = node2->parent; + } + while (node1->parent != node2->parent) { + node1 = node1->parent; + node2 = node2->parent; + /* should not happen but just in case ... */ + if ((node1 == NULL) || (node2 == NULL)) + return(-2); + } + /* + * Find who's first. + */ + if (node1 == node2->prev) + return(1); + if (node1 == node2->next) + return(-1); + /* + * Speedup using document order if availble. + */ + if ((node1->type == XML_ELEMENT_NODE) && + (node2->type == XML_ELEMENT_NODE) && + (0 > (long) node1->content) && + (0 > (long) node2->content) && + (node1->doc == node2->doc)) { + + l1 = -((long) node1->content); + l2 = -((long) node2->content); + if (l1 < l2) + return(1); + if (l1 > l2) + return(-1); + } + + for (cur = node1->next;cur != NULL;cur = cur->next) + if (cur == node2) + return(1); + return(-1); /* assume there is no sibling list corruption */ +} +#endif /* XP_OPTIMIZED_NON_ELEM_COMPARISON */ + +/* + * Wrapper for the Timsort argorithm from timsort.h + */ +#ifdef WITH_TIM_SORT +#define SORT_NAME libxml_domnode +#define SORT_TYPE xmlNodePtr +/** + * wrap_cmp: + * @x: a node + * @y: another node + * + * Comparison function for the Timsort implementation + * + * Returns -2 in case of error -1 if first point < second point, 0 if + * it's the same node, +1 otherwise + */ +static +int wrap_cmp( xmlNodePtr x, xmlNodePtr y ); +#ifdef XP_OPTIMIZED_NON_ELEM_COMPARISON + static int wrap_cmp( xmlNodePtr x, xmlNodePtr y ) + { + int res = xmlXPathCmpNodesExt(x, y); + return res == -2 ? res : -res; + } +#else + static int wrap_cmp( xmlNodePtr x, xmlNodePtr y ) + { + int res = xmlXPathCmpNodes(x, y); + return res == -2 ? res : -res; + } +#endif +#define SORT_CMP(x, y) (wrap_cmp(x, y)) +#include "timsort.h" +#endif /* WITH_TIM_SORT */ + +#if defined(LIBXML_XPATH_ENABLED) || defined(LIBXML_SCHEMAS_ENABLED) + +/************************************************************************ + * * + * Floating point stuff * + * * + ************************************************************************/ + +#ifndef TRIO_REPLACE_STDIO +#define TRIO_PUBLIC static +#endif +#include "trionan.c" + +/* + * The lack of portability of this section of the libc is annoying ! + */ +double xmlXPathNAN = 0; +double xmlXPathPINF = 1; +double xmlXPathNINF = -1; +static double xmlXPathNZERO = 0; /* not exported from headers */ +static int xmlXPathInitialized = 0; + +/** + * xmlXPathInit: + * + * Initialize the XPath environment + */ +void +xmlXPathInit(void) { + if (xmlXPathInitialized) return; + + xmlXPathPINF = trio_pinf(); + xmlXPathNINF = trio_ninf(); + xmlXPathNAN = trio_nan(); + xmlXPathNZERO = trio_nzero(); + + xmlXPathInitialized = 1; +} + +/** + * xmlXPathIsNaN: + * @val: a double value + * + * Provides a portable isnan() function to detect whether a double + * is a NotaNumber. Based on trio code + * http://sourceforge.net/projects/ctrio/ + * + * Returns 1 if the value is a NaN, 0 otherwise + */ +int +xmlXPathIsNaN(double val) { + return(trio_isnan(val)); +} + +/** + * xmlXPathIsInf: + * @val: a double value + * + * Provides a portable isinf() function to detect whether a double + * is a +Infinite or -Infinite. Based on trio code + * http://sourceforge.net/projects/ctrio/ + * + * Returns 1 vi the value is +Infinite, -1 if -Infinite, 0 otherwise + */ +int +xmlXPathIsInf(double val) { + return(trio_isinf(val)); +} + +#endif /* SCHEMAS or XPATH */ +#ifdef LIBXML_XPATH_ENABLED +/** + * xmlXPathGetSign: + * @val: a double value + * + * Provides a portable function to detect the sign of a double + * Modified from trio code + * http://sourceforge.net/projects/ctrio/ + * + * Returns 1 if the value is Negative, 0 if positive + */ +static int +xmlXPathGetSign(double val) { + return(trio_signbit(val)); +} + + +/* + * TODO: when compatibility allows remove all "fake node libxslt" strings + * the test should just be name[0] = ' ' + */ +#ifdef DEBUG_XPATH_EXPRESSION +#define DEBUG_STEP +#define DEBUG_EXPR +#define DEBUG_EVAL_COUNTS +#endif + +static xmlNs xmlXPathXMLNamespaceStruct = { + NULL, + XML_NAMESPACE_DECL, + XML_XML_NAMESPACE, + BAD_CAST "xml", + NULL, + NULL +}; +static xmlNsPtr xmlXPathXMLNamespace = &xmlXPathXMLNamespaceStruct; +#ifndef LIBXML_THREAD_ENABLED +/* + * Optimizer is disabled only when threaded apps are detected while + * the library ain't compiled for thread safety. + */ +static int xmlXPathDisableOptimizer = 0; +#endif + +/************************************************************************ + * * + * Error handling routines * + * * + ************************************************************************/ + +/** + * XP_ERRORNULL: + * @X: the error code + * + * Macro to raise an XPath error and return NULL. + */ +#define XP_ERRORNULL(X) \ + { xmlXPathErr(ctxt, X); return(NULL); } + +/* + * The array xmlXPathErrorMessages corresponds to the enum xmlXPathError + */ +static const char *xmlXPathErrorMessages[] = { + "Ok\n", + "Number encoding\n", + "Unfinished literal\n", + "Start of literal\n", + "Expected $ for variable reference\n", + "Undefined variable\n", + "Invalid predicate\n", + "Invalid expression\n", + "Missing closing curly brace\n", + "Unregistered function\n", + "Invalid operand\n", + "Invalid type\n", + "Invalid number of arguments\n", + "Invalid context size\n", + "Invalid context position\n", + "Memory allocation error\n", + "Syntax error\n", + "Resource error\n", + "Sub resource error\n", + "Undefined namespace prefix\n", + "Encoding error\n", + "Char out of XML range\n", + "Invalid or incomplete context\n", + "Stack usage error\n", + "Forbidden variable\n", + "?? Unknown error ??\n" /* Must be last in the list! */ +}; +#define MAXERRNO ((int)(sizeof(xmlXPathErrorMessages) / \ + sizeof(xmlXPathErrorMessages[0])) - 1) +/** + * xmlXPathErrMemory: + * @ctxt: an XPath context + * @extra: extra informations + * + * Handle a redefinition of attribute error + */ +static void +xmlXPathErrMemory(xmlXPathContextPtr ctxt, const char *extra) +{ + if (ctxt != NULL) { + if (extra) { + xmlChar buf[200]; + + xmlStrPrintf(buf, 200, + "Memory allocation failed : %s\n", + extra); + ctxt->lastError.message = (char *) xmlStrdup(buf); + } else { + ctxt->lastError.message = (char *) + xmlStrdup(BAD_CAST "Memory allocation failed\n"); + } + ctxt->lastError.domain = XML_FROM_XPATH; + ctxt->lastError.code = XML_ERR_NO_MEMORY; + if (ctxt->error != NULL) + ctxt->error(ctxt->userData, &ctxt->lastError); + } else { + if (extra) + __xmlRaiseError(NULL, NULL, NULL, + NULL, NULL, XML_FROM_XPATH, + XML_ERR_NO_MEMORY, XML_ERR_FATAL, NULL, 0, + extra, NULL, NULL, 0, 0, + "Memory allocation failed : %s\n", extra); + else + __xmlRaiseError(NULL, NULL, NULL, + NULL, NULL, XML_FROM_XPATH, + XML_ERR_NO_MEMORY, XML_ERR_FATAL, NULL, 0, + NULL, NULL, NULL, 0, 0, + "Memory allocation failed\n"); + } +} + +/** + * xmlXPathPErrMemory: + * @ctxt: an XPath parser context + * @extra: extra informations + * + * Handle a redefinition of attribute error + */ +static void +xmlXPathPErrMemory(xmlXPathParserContextPtr ctxt, const char *extra) +{ + if (ctxt == NULL) + xmlXPathErrMemory(NULL, extra); + else { + ctxt->error = XPATH_MEMORY_ERROR; + xmlXPathErrMemory(ctxt->context, extra); + } +} + +/** + * xmlXPathErr: + * @ctxt: a XPath parser context + * @error: the error code + * + * Handle an XPath error + */ +void +xmlXPathErr(xmlXPathParserContextPtr ctxt, int error) +{ + if ((error < 0) || (error > MAXERRNO)) + error = MAXERRNO; + if (ctxt == NULL) { + __xmlRaiseError(NULL, NULL, NULL, + NULL, NULL, XML_FROM_XPATH, + error + XML_XPATH_EXPRESSION_OK - XPATH_EXPRESSION_OK, + XML_ERR_ERROR, NULL, 0, + NULL, NULL, NULL, 0, 0, + "%s", xmlXPathErrorMessages[error]); + return; + } + ctxt->error = error; + if (ctxt->context == NULL) { + __xmlRaiseError(NULL, NULL, NULL, + NULL, NULL, XML_FROM_XPATH, + error + XML_XPATH_EXPRESSION_OK - XPATH_EXPRESSION_OK, + XML_ERR_ERROR, NULL, 0, + (const char *) ctxt->base, NULL, NULL, + ctxt->cur - ctxt->base, 0, + "%s", xmlXPathErrorMessages[error]); + return; + } + + /* cleanup current last error */ + xmlResetError(&ctxt->context->lastError); + + ctxt->context->lastError.domain = XML_FROM_XPATH; + ctxt->context->lastError.code = error + XML_XPATH_EXPRESSION_OK - + XPATH_EXPRESSION_OK; + ctxt->context->lastError.level = XML_ERR_ERROR; + ctxt->context->lastError.str1 = (char *) xmlStrdup(ctxt->base); + ctxt->context->lastError.int1 = ctxt->cur - ctxt->base; + ctxt->context->lastError.node = ctxt->context->debugNode; + if (ctxt->context->error != NULL) { + ctxt->context->error(ctxt->context->userData, + &ctxt->context->lastError); + } else { + __xmlRaiseError(NULL, NULL, NULL, + NULL, ctxt->context->debugNode, XML_FROM_XPATH, + error + XML_XPATH_EXPRESSION_OK - XPATH_EXPRESSION_OK, + XML_ERR_ERROR, NULL, 0, + (const char *) ctxt->base, NULL, NULL, + ctxt->cur - ctxt->base, 0, + "%s", xmlXPathErrorMessages[error]); + } + +} + +/** + * xmlXPatherror: + * @ctxt: the XPath Parser context + * @file: the file name + * @line: the line number + * @no: the error number + * + * Formats an error message. + */ +void +xmlXPatherror(xmlXPathParserContextPtr ctxt, const char *file ATTRIBUTE_UNUSED, + int line ATTRIBUTE_UNUSED, int no) { + xmlXPathErr(ctxt, no); +} + +/************************************************************************ + * * + * Utilities * + * * + ************************************************************************/ + +/** + * xsltPointerList: + * + * Pointer-list for various purposes. + */ +typedef struct _xmlPointerList xmlPointerList; +typedef xmlPointerList *xmlPointerListPtr; +struct _xmlPointerList { + void **items; + int number; + int size; +}; +/* +* TODO: Since such a list-handling is used in xmlschemas.c and libxslt +* and here, we should make the functions public. +*/ +static int +xmlPointerListAddSize(xmlPointerListPtr list, + void *item, + int initialSize) +{ + if (list->items == NULL) { + if (initialSize <= 0) + initialSize = 1; + list->items = (void **) xmlMalloc(initialSize * sizeof(void *)); + if (list->items == NULL) { + xmlXPathErrMemory(NULL, + "xmlPointerListCreate: allocating item\n"); + return(-1); + } + list->number = 0; + list->size = initialSize; + } else if (list->size <= list->number) { + if (list->size > 50000000) { + xmlXPathErrMemory(NULL, + "xmlPointerListAddSize: re-allocating item\n"); + return(-1); + } + list->size *= 2; + list->items = (void **) xmlRealloc(list->items, + list->size * sizeof(void *)); + if (list->items == NULL) { + xmlXPathErrMemory(NULL, + "xmlPointerListAddSize: re-allocating item\n"); + list->size = 0; + return(-1); + } + } + list->items[list->number++] = item; + return(0); +} + +/** + * xsltPointerListCreate: + * + * Creates an xsltPointerList structure. + * + * Returns a xsltPointerList structure or NULL in case of an error. + */ +static xmlPointerListPtr +xmlPointerListCreate(int initialSize) +{ + xmlPointerListPtr ret; + + ret = xmlMalloc(sizeof(xmlPointerList)); + if (ret == NULL) { + xmlXPathErrMemory(NULL, + "xmlPointerListCreate: allocating item\n"); + return (NULL); + } + memset(ret, 0, sizeof(xmlPointerList)); + if (initialSize > 0) { + xmlPointerListAddSize(ret, NULL, initialSize); + ret->number = 0; + } + return (ret); +} + +/** + * xsltPointerListFree: + * + * Frees the xsltPointerList structure. This does not free + * the content of the list. + */ +static void +xmlPointerListFree(xmlPointerListPtr list) +{ + if (list == NULL) + return; + if (list->items != NULL) + xmlFree(list->items); + xmlFree(list); +} + +/************************************************************************ + * * + * Parser Types * + * * + ************************************************************************/ + +/* + * Types are private: + */ + +typedef enum { + XPATH_OP_END=0, + XPATH_OP_AND, + XPATH_OP_OR, + XPATH_OP_EQUAL, + XPATH_OP_CMP, + XPATH_OP_PLUS, + XPATH_OP_MULT, + XPATH_OP_UNION, + XPATH_OP_ROOT, + XPATH_OP_NODE, + XPATH_OP_RESET, /* 10 */ + XPATH_OP_COLLECT, + XPATH_OP_VALUE, /* 12 */ + XPATH_OP_VARIABLE, + XPATH_OP_FUNCTION, + XPATH_OP_ARG, + XPATH_OP_PREDICATE, + XPATH_OP_FILTER, /* 17 */ + XPATH_OP_SORT /* 18 */ +#ifdef LIBXML_XPTR_ENABLED + ,XPATH_OP_RANGETO +#endif +} xmlXPathOp; + +typedef enum { + AXIS_ANCESTOR = 1, + AXIS_ANCESTOR_OR_SELF, + AXIS_ATTRIBUTE, + AXIS_CHILD, + AXIS_DESCENDANT, + AXIS_DESCENDANT_OR_SELF, + AXIS_FOLLOWING, + AXIS_FOLLOWING_SIBLING, + AXIS_NAMESPACE, + AXIS_PARENT, + AXIS_PRECEDING, + AXIS_PRECEDING_SIBLING, + AXIS_SELF +} xmlXPathAxisVal; + +typedef enum { + NODE_TEST_NONE = 0, + NODE_TEST_TYPE = 1, + NODE_TEST_PI = 2, + NODE_TEST_ALL = 3, + NODE_TEST_NS = 4, + NODE_TEST_NAME = 5 +} xmlXPathTestVal; + +typedef enum { + NODE_TYPE_NODE = 0, + NODE_TYPE_COMMENT = XML_COMMENT_NODE, + NODE_TYPE_TEXT = XML_TEXT_NODE, + NODE_TYPE_PI = XML_PI_NODE +} xmlXPathTypeVal; + +typedef struct _xmlXPathStepOp xmlXPathStepOp; +typedef xmlXPathStepOp *xmlXPathStepOpPtr; +struct _xmlXPathStepOp { + xmlXPathOp op; /* The identifier of the operation */ + int ch1; /* First child */ + int ch2; /* Second child */ + int value; + int value2; + int value3; + void *value4; + void *value5; + void *cache; + void *cacheURI; +}; + +struct _xmlXPathCompExpr { + int nbStep; /* Number of steps in this expression */ + int maxStep; /* Maximum number of steps allocated */ + xmlXPathStepOp *steps; /* ops for computation of this expression */ + int last; /* index of last step in expression */ + xmlChar *expr; /* the expression being computed */ + xmlDictPtr dict; /* the dictionary to use if any */ +#ifdef DEBUG_EVAL_COUNTS + int nb; + xmlChar *string; +#endif +#ifdef XPATH_STREAMING + xmlPatternPtr stream; +#endif +}; + +/************************************************************************ + * * + * Forward declarations * + * * + ************************************************************************/ +static void +xmlXPathFreeValueTree(xmlNodeSetPtr obj); +static void +xmlXPathReleaseObject(xmlXPathContextPtr ctxt, xmlXPathObjectPtr obj); +static int +xmlXPathCompOpEvalFirst(xmlXPathParserContextPtr ctxt, + xmlXPathStepOpPtr op, xmlNodePtr *first); +static int +xmlXPathCompOpEvalToBoolean(xmlXPathParserContextPtr ctxt, + xmlXPathStepOpPtr op, + int isPredicate); + +/************************************************************************ + * * + * Parser Type functions * + * * + ************************************************************************/ + +/** + * xmlXPathNewCompExpr: + * + * Create a new Xpath component + * + * Returns the newly allocated xmlXPathCompExprPtr or NULL in case of error + */ +static xmlXPathCompExprPtr +xmlXPathNewCompExpr(void) { + xmlXPathCompExprPtr cur; + + cur = (xmlXPathCompExprPtr) xmlMalloc(sizeof(xmlXPathCompExpr)); + if (cur == NULL) { + xmlXPathErrMemory(NULL, "allocating component\n"); + return(NULL); + } + memset(cur, 0, sizeof(xmlXPathCompExpr)); + cur->maxStep = 10; + cur->nbStep = 0; + cur->steps = (xmlXPathStepOp *) xmlMalloc(cur->maxStep * + sizeof(xmlXPathStepOp)); + if (cur->steps == NULL) { + xmlXPathErrMemory(NULL, "allocating steps\n"); + xmlFree(cur); + return(NULL); + } + memset(cur->steps, 0, cur->maxStep * sizeof(xmlXPathStepOp)); + cur->last = -1; +#ifdef DEBUG_EVAL_COUNTS + cur->nb = 0; +#endif + return(cur); +} + +/** + * xmlXPathFreeCompExpr: + * @comp: an XPATH comp + * + * Free up the memory allocated by @comp + */ +void +xmlXPathFreeCompExpr(xmlXPathCompExprPtr comp) +{ + xmlXPathStepOpPtr op; + int i; + + if (comp == NULL) + return; + if (comp->dict == NULL) { + for (i = 0; i < comp->nbStep; i++) { + op = &comp->steps[i]; + if (op->value4 != NULL) { + if (op->op == XPATH_OP_VALUE) + xmlXPathFreeObject(op->value4); + else + xmlFree(op->value4); + } + if (op->value5 != NULL) + xmlFree(op->value5); + } + } else { + for (i = 0; i < comp->nbStep; i++) { + op = &comp->steps[i]; + if (op->value4 != NULL) { + if (op->op == XPATH_OP_VALUE) + xmlXPathFreeObject(op->value4); + } + } + xmlDictFree(comp->dict); + } + if (comp->steps != NULL) { + xmlFree(comp->steps); + } +#ifdef DEBUG_EVAL_COUNTS + if (comp->string != NULL) { + xmlFree(comp->string); + } +#endif +#ifdef XPATH_STREAMING + if (comp->stream != NULL) { + xmlFreePatternList(comp->stream); + } +#endif + if (comp->expr != NULL) { + xmlFree(comp->expr); + } + + xmlFree(comp); +} + +/** + * xmlXPathCompExprAdd: + * @comp: the compiled expression + * @ch1: first child index + * @ch2: second child index + * @op: an op + * @value: the first int value + * @value2: the second int value + * @value3: the third int value + * @value4: the first string value + * @value5: the second string value + * + * Add a step to an XPath Compiled Expression + * + * Returns -1 in case of failure, the index otherwise + */ +static int +xmlXPathCompExprAdd(xmlXPathCompExprPtr comp, int ch1, int ch2, + xmlXPathOp op, int value, + int value2, int value3, void *value4, void *value5) { + if (comp->nbStep >= comp->maxStep) { + xmlXPathStepOp *real; + + if (comp->maxStep >= XPATH_MAX_STEPS) { + xmlXPathErrMemory(NULL, "adding step\n"); + return(-1); + } + comp->maxStep *= 2; + real = (xmlXPathStepOp *) xmlRealloc(comp->steps, + comp->maxStep * sizeof(xmlXPathStepOp)); + if (real == NULL) { + comp->maxStep /= 2; + xmlXPathErrMemory(NULL, "adding step\n"); + return(-1); + } + comp->steps = real; + } + comp->last = comp->nbStep; + comp->steps[comp->nbStep].ch1 = ch1; + comp->steps[comp->nbStep].ch2 = ch2; + comp->steps[comp->nbStep].op = op; + comp->steps[comp->nbStep].value = value; + comp->steps[comp->nbStep].value2 = value2; + comp->steps[comp->nbStep].value3 = value3; + if ((comp->dict != NULL) && + ((op == XPATH_OP_FUNCTION) || (op == XPATH_OP_VARIABLE) || + (op == XPATH_OP_COLLECT))) { + if (value4 != NULL) { + comp->steps[comp->nbStep].value4 = (xmlChar *) + (void *)xmlDictLookup(comp->dict, value4, -1); + xmlFree(value4); + } else + comp->steps[comp->nbStep].value4 = NULL; + if (value5 != NULL) { + comp->steps[comp->nbStep].value5 = (xmlChar *) + (void *)xmlDictLookup(comp->dict, value5, -1); + xmlFree(value5); + } else + comp->steps[comp->nbStep].value5 = NULL; + } else { + comp->steps[comp->nbStep].value4 = value4; + comp->steps[comp->nbStep].value5 = value5; + } + comp->steps[comp->nbStep].cache = NULL; + return(comp->nbStep++); +} + +/** + * xmlXPathCompSwap: + * @comp: the compiled expression + * @op: operation index + * + * Swaps 2 operations in the compiled expression + */ +static void +xmlXPathCompSwap(xmlXPathStepOpPtr op) { + int tmp; + +#ifndef LIBXML_THREAD_ENABLED + /* + * Since this manipulates possibly shared variables, this is + * disabled if one detects that the library is used in a multithreaded + * application + */ + if (xmlXPathDisableOptimizer) + return; +#endif + + tmp = op->ch1; + op->ch1 = op->ch2; + op->ch2 = tmp; +} + +#define PUSH_FULL_EXPR(op, op1, op2, val, val2, val3, val4, val5) \ + xmlXPathCompExprAdd(ctxt->comp, (op1), (op2), \ + (op), (val), (val2), (val3), (val4), (val5)) +#define PUSH_LONG_EXPR(op, val, val2, val3, val4, val5) \ + xmlXPathCompExprAdd(ctxt->comp, ctxt->comp->last, -1, \ + (op), (val), (val2), (val3), (val4), (val5)) + +#define PUSH_LEAVE_EXPR(op, val, val2) \ +xmlXPathCompExprAdd(ctxt->comp, -1, -1, (op), (val), (val2), 0 ,NULL ,NULL) + +#define PUSH_UNARY_EXPR(op, ch, val, val2) \ +xmlXPathCompExprAdd(ctxt->comp, (ch), -1, (op), (val), (val2), 0 ,NULL ,NULL) + +#define PUSH_BINARY_EXPR(op, ch1, ch2, val, val2) \ +xmlXPathCompExprAdd(ctxt->comp, (ch1), (ch2), (op), \ + (val), (val2), 0 ,NULL ,NULL) + +/************************************************************************ + * * + * XPath object cache structures * + * * + ************************************************************************/ + +/* #define XP_DEFAULT_CACHE_ON */ + +#define XP_HAS_CACHE(c) ((c != NULL) && ((c)->cache != NULL)) + +typedef struct _xmlXPathContextCache xmlXPathContextCache; +typedef xmlXPathContextCache *xmlXPathContextCachePtr; +struct _xmlXPathContextCache { + xmlPointerListPtr nodesetObjs; /* contains xmlXPathObjectPtr */ + xmlPointerListPtr stringObjs; /* contains xmlXPathObjectPtr */ + xmlPointerListPtr booleanObjs; /* contains xmlXPathObjectPtr */ + xmlPointerListPtr numberObjs; /* contains xmlXPathObjectPtr */ + xmlPointerListPtr miscObjs; /* contains xmlXPathObjectPtr */ + int maxNodeset; + int maxString; + int maxBoolean; + int maxNumber; + int maxMisc; +#ifdef XP_DEBUG_OBJ_USAGE + int dbgCachedAll; + int dbgCachedNodeset; + int dbgCachedString; + int dbgCachedBool; + int dbgCachedNumber; + int dbgCachedPoint; + int dbgCachedRange; + int dbgCachedLocset; + int dbgCachedUsers; + int dbgCachedXSLTTree; + int dbgCachedUndefined; + + + int dbgReusedAll; + int dbgReusedNodeset; + int dbgReusedString; + int dbgReusedBool; + int dbgReusedNumber; + int dbgReusedPoint; + int dbgReusedRange; + int dbgReusedLocset; + int dbgReusedUsers; + int dbgReusedXSLTTree; + int dbgReusedUndefined; + +#endif +}; + +/************************************************************************ + * * + * Debugging related functions * + * * + ************************************************************************/ + +#define STRANGE \ + xmlGenericError(xmlGenericErrorContext, \ + "Internal error at %s:%d\n", \ + __FILE__, __LINE__); + +#ifdef LIBXML_DEBUG_ENABLED +static void +xmlXPathDebugDumpNode(FILE *output, xmlNodePtr cur, int depth) { + int i; + char shift[100]; + + for (i = 0;((i < depth) && (i < 25));i++) + shift[2 * i] = shift[2 * i + 1] = ' '; + shift[2 * i] = shift[2 * i + 1] = 0; + if (cur == NULL) { + fprintf(output, "%s", shift); + fprintf(output, "Node is NULL !\n"); + return; + + } + + if ((cur->type == XML_DOCUMENT_NODE) || + (cur->type == XML_HTML_DOCUMENT_NODE)) { + fprintf(output, "%s", shift); + fprintf(output, " /\n"); + } else if (cur->type == XML_ATTRIBUTE_NODE) + xmlDebugDumpAttr(output, (xmlAttrPtr)cur, depth); + else + xmlDebugDumpOneNode(output, cur, depth); +} +static void +xmlXPathDebugDumpNodeList(FILE *output, xmlNodePtr cur, int depth) { + xmlNodePtr tmp; + int i; + char shift[100]; + + for (i = 0;((i < depth) && (i < 25));i++) + shift[2 * i] = shift[2 * i + 1] = ' '; + shift[2 * i] = shift[2 * i + 1] = 0; + if (cur == NULL) { + fprintf(output, "%s", shift); + fprintf(output, "Node is NULL !\n"); + return; + + } + + while (cur != NULL) { + tmp = cur; + cur = cur->next; + xmlDebugDumpOneNode(output, tmp, depth); + } +} + +static void +xmlXPathDebugDumpNodeSet(FILE *output, xmlNodeSetPtr cur, int depth) { + int i; + char shift[100]; + + for (i = 0;((i < depth) && (i < 25));i++) + shift[2 * i] = shift[2 * i + 1] = ' '; + shift[2 * i] = shift[2 * i + 1] = 0; + + if (cur == NULL) { + fprintf(output, "%s", shift); + fprintf(output, "NodeSet is NULL !\n"); + return; + + } + + if (cur != NULL) { + fprintf(output, "Set contains %d nodes:\n", cur->nodeNr); + for (i = 0;i < cur->nodeNr;i++) { + fprintf(output, "%s", shift); + fprintf(output, "%d", i + 1); + xmlXPathDebugDumpNode(output, cur->nodeTab[i], depth + 1); + } + } +} + +static void +xmlXPathDebugDumpValueTree(FILE *output, xmlNodeSetPtr cur, int depth) { + int i; + char shift[100]; + + for (i = 0;((i < depth) && (i < 25));i++) + shift[2 * i] = shift[2 * i + 1] = ' '; + shift[2 * i] = shift[2 * i + 1] = 0; + + if ((cur == NULL) || (cur->nodeNr == 0) || (cur->nodeTab[0] == NULL)) { + fprintf(output, "%s", shift); + fprintf(output, "Value Tree is NULL !\n"); + return; + + } + + fprintf(output, "%s", shift); + fprintf(output, "%d", i + 1); + xmlXPathDebugDumpNodeList(output, cur->nodeTab[0]->children, depth + 1); +} +#if defined(LIBXML_XPTR_ENABLED) +static void +xmlXPathDebugDumpLocationSet(FILE *output, xmlLocationSetPtr cur, int depth) { + int i; + char shift[100]; + + for (i = 0;((i < depth) && (i < 25));i++) + shift[2 * i] = shift[2 * i + 1] = ' '; + shift[2 * i] = shift[2 * i + 1] = 0; + + if (cur == NULL) { + fprintf(output, "%s", shift); + fprintf(output, "LocationSet is NULL !\n"); + return; + + } + + for (i = 0;i < cur->locNr;i++) { + fprintf(output, "%s", shift); + fprintf(output, "%d : ", i + 1); + xmlXPathDebugDumpObject(output, cur->locTab[i], depth + 1); + } +} +#endif /* LIBXML_XPTR_ENABLED */ + +/** + * xmlXPathDebugDumpObject: + * @output: the FILE * to dump the output + * @cur: the object to inspect + * @depth: indentation level + * + * Dump the content of the object for debugging purposes + */ +void +xmlXPathDebugDumpObject(FILE *output, xmlXPathObjectPtr cur, int depth) { + int i; + char shift[100]; + + if (output == NULL) return; + + for (i = 0;((i < depth) && (i < 25));i++) + shift[2 * i] = shift[2 * i + 1] = ' '; + shift[2 * i] = shift[2 * i + 1] = 0; + + + fprintf(output, "%s", shift); + + if (cur == NULL) { + fprintf(output, "Object is empty (NULL)\n"); + return; + } + switch(cur->type) { + case XPATH_UNDEFINED: + fprintf(output, "Object is uninitialized\n"); + break; + case XPATH_NODESET: + fprintf(output, "Object is a Node Set :\n"); + xmlXPathDebugDumpNodeSet(output, cur->nodesetval, depth); + break; + case XPATH_XSLT_TREE: + fprintf(output, "Object is an XSLT value tree :\n"); + xmlXPathDebugDumpValueTree(output, cur->nodesetval, depth); + break; + case XPATH_BOOLEAN: + fprintf(output, "Object is a Boolean : "); + if (cur->boolval) fprintf(output, "true\n"); + else fprintf(output, "false\n"); + break; + case XPATH_NUMBER: + switch (xmlXPathIsInf(cur->floatval)) { + case 1: + fprintf(output, "Object is a number : Infinity\n"); + break; + case -1: + fprintf(output, "Object is a number : -Infinity\n"); + break; + default: + if (xmlXPathIsNaN(cur->floatval)) { + fprintf(output, "Object is a number : NaN\n"); + } else if (cur->floatval == 0 && xmlXPathGetSign(cur->floatval) != 0) { + fprintf(output, "Object is a number : 0\n"); + } else { + fprintf(output, "Object is a number : %0g\n", cur->floatval); + } + } + break; + case XPATH_STRING: + fprintf(output, "Object is a string : "); + xmlDebugDumpString(output, cur->stringval); + fprintf(output, "\n"); + break; + case XPATH_POINT: + fprintf(output, "Object is a point : index %d in node", cur->index); + xmlXPathDebugDumpNode(output, (xmlNodePtr) cur->user, depth + 1); + fprintf(output, "\n"); + break; + case XPATH_RANGE: + if ((cur->user2 == NULL) || + ((cur->user2 == cur->user) && (cur->index == cur->index2))) { + fprintf(output, "Object is a collapsed range :\n"); + fprintf(output, "%s", shift); + if (cur->index >= 0) + fprintf(output, "index %d in ", cur->index); + fprintf(output, "node\n"); + xmlXPathDebugDumpNode(output, (xmlNodePtr) cur->user, + depth + 1); + } else { + fprintf(output, "Object is a range :\n"); + fprintf(output, "%s", shift); + fprintf(output, "From "); + if (cur->index >= 0) + fprintf(output, "index %d in ", cur->index); + fprintf(output, "node\n"); + xmlXPathDebugDumpNode(output, (xmlNodePtr) cur->user, + depth + 1); + fprintf(output, "%s", shift); + fprintf(output, "To "); + if (cur->index2 >= 0) + fprintf(output, "index %d in ", cur->index2); + fprintf(output, "node\n"); + xmlXPathDebugDumpNode(output, (xmlNodePtr) cur->user2, + depth + 1); + fprintf(output, "\n"); + } + break; + case XPATH_LOCATIONSET: +#if defined(LIBXML_XPTR_ENABLED) + fprintf(output, "Object is a Location Set:\n"); + xmlXPathDebugDumpLocationSet(output, + (xmlLocationSetPtr) cur->user, depth); +#endif + break; + case XPATH_USERS: + fprintf(output, "Object is user defined\n"); + break; + } +} + +static void +xmlXPathDebugDumpStepOp(FILE *output, xmlXPathCompExprPtr comp, + xmlXPathStepOpPtr op, int depth) { + int i; + char shift[100]; + + for (i = 0;((i < depth) && (i < 25));i++) + shift[2 * i] = shift[2 * i + 1] = ' '; + shift[2 * i] = shift[2 * i + 1] = 0; + + fprintf(output, "%s", shift); + if (op == NULL) { + fprintf(output, "Step is NULL\n"); + return; + } + switch (op->op) { + case XPATH_OP_END: + fprintf(output, "END"); break; + case XPATH_OP_AND: + fprintf(output, "AND"); break; + case XPATH_OP_OR: + fprintf(output, "OR"); break; + case XPATH_OP_EQUAL: + if (op->value) + fprintf(output, "EQUAL ="); + else + fprintf(output, "EQUAL !="); + break; + case XPATH_OP_CMP: + if (op->value) + fprintf(output, "CMP <"); + else + fprintf(output, "CMP >"); + if (!op->value2) + fprintf(output, "="); + break; + case XPATH_OP_PLUS: + if (op->value == 0) + fprintf(output, "PLUS -"); + else if (op->value == 1) + fprintf(output, "PLUS +"); + else if (op->value == 2) + fprintf(output, "PLUS unary -"); + else if (op->value == 3) + fprintf(output, "PLUS unary - -"); + break; + case XPATH_OP_MULT: + if (op->value == 0) + fprintf(output, "MULT *"); + else if (op->value == 1) + fprintf(output, "MULT div"); + else + fprintf(output, "MULT mod"); + break; + case XPATH_OP_UNION: + fprintf(output, "UNION"); break; + case XPATH_OP_ROOT: + fprintf(output, "ROOT"); break; + case XPATH_OP_NODE: + fprintf(output, "NODE"); break; + case XPATH_OP_RESET: + fprintf(output, "RESET"); break; + case XPATH_OP_SORT: + fprintf(output, "SORT"); break; + case XPATH_OP_COLLECT: { + xmlXPathAxisVal axis = (xmlXPathAxisVal)op->value; + xmlXPathTestVal test = (xmlXPathTestVal)op->value2; + xmlXPathTypeVal type = (xmlXPathTypeVal)op->value3; + const xmlChar *prefix = op->value4; + const xmlChar *name = op->value5; + + fprintf(output, "COLLECT "); + switch (axis) { + case AXIS_ANCESTOR: + fprintf(output, " 'ancestors' "); break; + case AXIS_ANCESTOR_OR_SELF: + fprintf(output, " 'ancestors-or-self' "); break; + case AXIS_ATTRIBUTE: + fprintf(output, " 'attributes' "); break; + case AXIS_CHILD: + fprintf(output, " 'child' "); break; + case AXIS_DESCENDANT: + fprintf(output, " 'descendant' "); break; + case AXIS_DESCENDANT_OR_SELF: + fprintf(output, " 'descendant-or-self' "); break; + case AXIS_FOLLOWING: + fprintf(output, " 'following' "); break; + case AXIS_FOLLOWING_SIBLING: + fprintf(output, " 'following-siblings' "); break; + case AXIS_NAMESPACE: + fprintf(output, " 'namespace' "); break; + case AXIS_PARENT: + fprintf(output, " 'parent' "); break; + case AXIS_PRECEDING: + fprintf(output, " 'preceding' "); break; + case AXIS_PRECEDING_SIBLING: + fprintf(output, " 'preceding-sibling' "); break; + case AXIS_SELF: + fprintf(output, " 'self' "); break; + } + switch (test) { + case NODE_TEST_NONE: + fprintf(output, "'none' "); break; + case NODE_TEST_TYPE: + fprintf(output, "'type' "); break; + case NODE_TEST_PI: + fprintf(output, "'PI' "); break; + case NODE_TEST_ALL: + fprintf(output, "'all' "); break; + case NODE_TEST_NS: + fprintf(output, "'namespace' "); break; + case NODE_TEST_NAME: + fprintf(output, "'name' "); break; + } + switch (type) { + case NODE_TYPE_NODE: + fprintf(output, "'node' "); break; + case NODE_TYPE_COMMENT: + fprintf(output, "'comment' "); break; + case NODE_TYPE_TEXT: + fprintf(output, "'text' "); break; + case NODE_TYPE_PI: + fprintf(output, "'PI' "); break; + } + if (prefix != NULL) + fprintf(output, "%s:", prefix); + if (name != NULL) + fprintf(output, "%s", (const char *) name); + break; + + } + case XPATH_OP_VALUE: { + xmlXPathObjectPtr object = (xmlXPathObjectPtr) op->value4; + + fprintf(output, "ELEM "); + xmlXPathDebugDumpObject(output, object, 0); + goto finish; + } + case XPATH_OP_VARIABLE: { + const xmlChar *prefix = op->value5; + const xmlChar *name = op->value4; + + if (prefix != NULL) + fprintf(output, "VARIABLE %s:%s", prefix, name); + else + fprintf(output, "VARIABLE %s", name); + break; + } + case XPATH_OP_FUNCTION: { + int nbargs = op->value; + const xmlChar *prefix = op->value5; + const xmlChar *name = op->value4; + + if (prefix != NULL) + fprintf(output, "FUNCTION %s:%s(%d args)", + prefix, name, nbargs); + else + fprintf(output, "FUNCTION %s(%d args)", name, nbargs); + break; + } + case XPATH_OP_ARG: fprintf(output, "ARG"); break; + case XPATH_OP_PREDICATE: fprintf(output, "PREDICATE"); break; + case XPATH_OP_FILTER: fprintf(output, "FILTER"); break; +#ifdef LIBXML_XPTR_ENABLED + case XPATH_OP_RANGETO: fprintf(output, "RANGETO"); break; +#endif + default: + fprintf(output, "UNKNOWN %d\n", op->op); return; + } + fprintf(output, "\n"); +finish: + if (op->ch1 >= 0) + xmlXPathDebugDumpStepOp(output, comp, &comp->steps[op->ch1], depth + 1); + if (op->ch2 >= 0) + xmlXPathDebugDumpStepOp(output, comp, &comp->steps[op->ch2], depth + 1); +} + +/** + * xmlXPathDebugDumpCompExpr: + * @output: the FILE * for the output + * @comp: the precompiled XPath expression + * @depth: the indentation level. + * + * Dumps the tree of the compiled XPath expression. + */ +void +xmlXPathDebugDumpCompExpr(FILE *output, xmlXPathCompExprPtr comp, + int depth) { + int i; + char shift[100]; + + if ((output == NULL) || (comp == NULL)) return; + + for (i = 0;((i < depth) && (i < 25));i++) + shift[2 * i] = shift[2 * i + 1] = ' '; + shift[2 * i] = shift[2 * i + 1] = 0; + + fprintf(output, "%s", shift); + + fprintf(output, "Compiled Expression : %d elements\n", + comp->nbStep); + i = comp->last; + xmlXPathDebugDumpStepOp(output, comp, &comp->steps[i], depth + 1); +} + +#ifdef XP_DEBUG_OBJ_USAGE + +/* +* XPath object usage related debugging variables. +*/ +static int xmlXPathDebugObjCounterUndefined = 0; +static int xmlXPathDebugObjCounterNodeset = 0; +static int xmlXPathDebugObjCounterBool = 0; +static int xmlXPathDebugObjCounterNumber = 0; +static int xmlXPathDebugObjCounterString = 0; +static int xmlXPathDebugObjCounterPoint = 0; +static int xmlXPathDebugObjCounterRange = 0; +static int xmlXPathDebugObjCounterLocset = 0; +static int xmlXPathDebugObjCounterUsers = 0; +static int xmlXPathDebugObjCounterXSLTTree = 0; +static int xmlXPathDebugObjCounterAll = 0; + +static int xmlXPathDebugObjTotalUndefined = 0; +static int xmlXPathDebugObjTotalNodeset = 0; +static int xmlXPathDebugObjTotalBool = 0; +static int xmlXPathDebugObjTotalNumber = 0; +static int xmlXPathDebugObjTotalString = 0; +static int xmlXPathDebugObjTotalPoint = 0; +static int xmlXPathDebugObjTotalRange = 0; +static int xmlXPathDebugObjTotalLocset = 0; +static int xmlXPathDebugObjTotalUsers = 0; +static int xmlXPathDebugObjTotalXSLTTree = 0; +static int xmlXPathDebugObjTotalAll = 0; + +static int xmlXPathDebugObjMaxUndefined = 0; +static int xmlXPathDebugObjMaxNodeset = 0; +static int xmlXPathDebugObjMaxBool = 0; +static int xmlXPathDebugObjMaxNumber = 0; +static int xmlXPathDebugObjMaxString = 0; +static int xmlXPathDebugObjMaxPoint = 0; +static int xmlXPathDebugObjMaxRange = 0; +static int xmlXPathDebugObjMaxLocset = 0; +static int xmlXPathDebugObjMaxUsers = 0; +static int xmlXPathDebugObjMaxXSLTTree = 0; +static int xmlXPathDebugObjMaxAll = 0; + +/* REVISIT TODO: Make this static when committing */ +static void +xmlXPathDebugObjUsageReset(xmlXPathContextPtr ctxt) +{ + if (ctxt != NULL) { + if (ctxt->cache != NULL) { + xmlXPathContextCachePtr cache = + (xmlXPathContextCachePtr) ctxt->cache; + + cache->dbgCachedAll = 0; + cache->dbgCachedNodeset = 0; + cache->dbgCachedString = 0; + cache->dbgCachedBool = 0; + cache->dbgCachedNumber = 0; + cache->dbgCachedPoint = 0; + cache->dbgCachedRange = 0; + cache->dbgCachedLocset = 0; + cache->dbgCachedUsers = 0; + cache->dbgCachedXSLTTree = 0; + cache->dbgCachedUndefined = 0; + + cache->dbgReusedAll = 0; + cache->dbgReusedNodeset = 0; + cache->dbgReusedString = 0; + cache->dbgReusedBool = 0; + cache->dbgReusedNumber = 0; + cache->dbgReusedPoint = 0; + cache->dbgReusedRange = 0; + cache->dbgReusedLocset = 0; + cache->dbgReusedUsers = 0; + cache->dbgReusedXSLTTree = 0; + cache->dbgReusedUndefined = 0; + } + } + + xmlXPathDebugObjCounterUndefined = 0; + xmlXPathDebugObjCounterNodeset = 0; + xmlXPathDebugObjCounterBool = 0; + xmlXPathDebugObjCounterNumber = 0; + xmlXPathDebugObjCounterString = 0; + xmlXPathDebugObjCounterPoint = 0; + xmlXPathDebugObjCounterRange = 0; + xmlXPathDebugObjCounterLocset = 0; + xmlXPathDebugObjCounterUsers = 0; + xmlXPathDebugObjCounterXSLTTree = 0; + xmlXPathDebugObjCounterAll = 0; + + xmlXPathDebugObjTotalUndefined = 0; + xmlXPathDebugObjTotalNodeset = 0; + xmlXPathDebugObjTotalBool = 0; + xmlXPathDebugObjTotalNumber = 0; + xmlXPathDebugObjTotalString = 0; + xmlXPathDebugObjTotalPoint = 0; + xmlXPathDebugObjTotalRange = 0; + xmlXPathDebugObjTotalLocset = 0; + xmlXPathDebugObjTotalUsers = 0; + xmlXPathDebugObjTotalXSLTTree = 0; + xmlXPathDebugObjTotalAll = 0; + + xmlXPathDebugObjMaxUndefined = 0; + xmlXPathDebugObjMaxNodeset = 0; + xmlXPathDebugObjMaxBool = 0; + xmlXPathDebugObjMaxNumber = 0; + xmlXPathDebugObjMaxString = 0; + xmlXPathDebugObjMaxPoint = 0; + xmlXPathDebugObjMaxRange = 0; + xmlXPathDebugObjMaxLocset = 0; + xmlXPathDebugObjMaxUsers = 0; + xmlXPathDebugObjMaxXSLTTree = 0; + xmlXPathDebugObjMaxAll = 0; + +} + +static void +xmlXPathDebugObjUsageRequested(xmlXPathContextPtr ctxt, + xmlXPathObjectType objType) +{ + int isCached = 0; + + if (ctxt != NULL) { + if (ctxt->cache != NULL) { + xmlXPathContextCachePtr cache = + (xmlXPathContextCachePtr) ctxt->cache; + + isCached = 1; + + cache->dbgReusedAll++; + switch (objType) { + case XPATH_UNDEFINED: + cache->dbgReusedUndefined++; + break; + case XPATH_NODESET: + cache->dbgReusedNodeset++; + break; + case XPATH_BOOLEAN: + cache->dbgReusedBool++; + break; + case XPATH_NUMBER: + cache->dbgReusedNumber++; + break; + case XPATH_STRING: + cache->dbgReusedString++; + break; + case XPATH_POINT: + cache->dbgReusedPoint++; + break; + case XPATH_RANGE: + cache->dbgReusedRange++; + break; + case XPATH_LOCATIONSET: + cache->dbgReusedLocset++; + break; + case XPATH_USERS: + cache->dbgReusedUsers++; + break; + case XPATH_XSLT_TREE: + cache->dbgReusedXSLTTree++; + break; + default: + break; + } + } + } + + switch (objType) { + case XPATH_UNDEFINED: + if (! isCached) + xmlXPathDebugObjTotalUndefined++; + xmlXPathDebugObjCounterUndefined++; + if (xmlXPathDebugObjCounterUndefined > + xmlXPathDebugObjMaxUndefined) + xmlXPathDebugObjMaxUndefined = + xmlXPathDebugObjCounterUndefined; + break; + case XPATH_NODESET: + if (! isCached) + xmlXPathDebugObjTotalNodeset++; + xmlXPathDebugObjCounterNodeset++; + if (xmlXPathDebugObjCounterNodeset > + xmlXPathDebugObjMaxNodeset) + xmlXPathDebugObjMaxNodeset = + xmlXPathDebugObjCounterNodeset; + break; + case XPATH_BOOLEAN: + if (! isCached) + xmlXPathDebugObjTotalBool++; + xmlXPathDebugObjCounterBool++; + if (xmlXPathDebugObjCounterBool > + xmlXPathDebugObjMaxBool) + xmlXPathDebugObjMaxBool = + xmlXPathDebugObjCounterBool; + break; + case XPATH_NUMBER: + if (! isCached) + xmlXPathDebugObjTotalNumber++; + xmlXPathDebugObjCounterNumber++; + if (xmlXPathDebugObjCounterNumber > + xmlXPathDebugObjMaxNumber) + xmlXPathDebugObjMaxNumber = + xmlXPathDebugObjCounterNumber; + break; + case XPATH_STRING: + if (! isCached) + xmlXPathDebugObjTotalString++; + xmlXPathDebugObjCounterString++; + if (xmlXPathDebugObjCounterString > + xmlXPathDebugObjMaxString) + xmlXPathDebugObjMaxString = + xmlXPathDebugObjCounterString; + break; + case XPATH_POINT: + if (! isCached) + xmlXPathDebugObjTotalPoint++; + xmlXPathDebugObjCounterPoint++; + if (xmlXPathDebugObjCounterPoint > + xmlXPathDebugObjMaxPoint) + xmlXPathDebugObjMaxPoint = + xmlXPathDebugObjCounterPoint; + break; + case XPATH_RANGE: + if (! isCached) + xmlXPathDebugObjTotalRange++; + xmlXPathDebugObjCounterRange++; + if (xmlXPathDebugObjCounterRange > + xmlXPathDebugObjMaxRange) + xmlXPathDebugObjMaxRange = + xmlXPathDebugObjCounterRange; + break; + case XPATH_LOCATIONSET: + if (! isCached) + xmlXPathDebugObjTotalLocset++; + xmlXPathDebugObjCounterLocset++; + if (xmlXPathDebugObjCounterLocset > + xmlXPathDebugObjMaxLocset) + xmlXPathDebugObjMaxLocset = + xmlXPathDebugObjCounterLocset; + break; + case XPATH_USERS: + if (! isCached) + xmlXPathDebugObjTotalUsers++; + xmlXPathDebugObjCounterUsers++; + if (xmlXPathDebugObjCounterUsers > + xmlXPathDebugObjMaxUsers) + xmlXPathDebugObjMaxUsers = + xmlXPathDebugObjCounterUsers; + break; + case XPATH_XSLT_TREE: + if (! isCached) + xmlXPathDebugObjTotalXSLTTree++; + xmlXPathDebugObjCounterXSLTTree++; + if (xmlXPathDebugObjCounterXSLTTree > + xmlXPathDebugObjMaxXSLTTree) + xmlXPathDebugObjMaxXSLTTree = + xmlXPathDebugObjCounterXSLTTree; + break; + default: + break; + } + if (! isCached) + xmlXPathDebugObjTotalAll++; + xmlXPathDebugObjCounterAll++; + if (xmlXPathDebugObjCounterAll > + xmlXPathDebugObjMaxAll) + xmlXPathDebugObjMaxAll = + xmlXPathDebugObjCounterAll; +} + +static void +xmlXPathDebugObjUsageReleased(xmlXPathContextPtr ctxt, + xmlXPathObjectType objType) +{ + int isCached = 0; + + if (ctxt != NULL) { + if (ctxt->cache != NULL) { + xmlXPathContextCachePtr cache = + (xmlXPathContextCachePtr) ctxt->cache; + + isCached = 1; + + cache->dbgCachedAll++; + switch (objType) { + case XPATH_UNDEFINED: + cache->dbgCachedUndefined++; + break; + case XPATH_NODESET: + cache->dbgCachedNodeset++; + break; + case XPATH_BOOLEAN: + cache->dbgCachedBool++; + break; + case XPATH_NUMBER: + cache->dbgCachedNumber++; + break; + case XPATH_STRING: + cache->dbgCachedString++; + break; + case XPATH_POINT: + cache->dbgCachedPoint++; + break; + case XPATH_RANGE: + cache->dbgCachedRange++; + break; + case XPATH_LOCATIONSET: + cache->dbgCachedLocset++; + break; + case XPATH_USERS: + cache->dbgCachedUsers++; + break; + case XPATH_XSLT_TREE: + cache->dbgCachedXSLTTree++; + break; + default: + break; + } + + } + } + switch (objType) { + case XPATH_UNDEFINED: + xmlXPathDebugObjCounterUndefined--; + break; + case XPATH_NODESET: + xmlXPathDebugObjCounterNodeset--; + break; + case XPATH_BOOLEAN: + xmlXPathDebugObjCounterBool--; + break; + case XPATH_NUMBER: + xmlXPathDebugObjCounterNumber--; + break; + case XPATH_STRING: + xmlXPathDebugObjCounterString--; + break; + case XPATH_POINT: + xmlXPathDebugObjCounterPoint--; + break; + case XPATH_RANGE: + xmlXPathDebugObjCounterRange--; + break; + case XPATH_LOCATIONSET: + xmlXPathDebugObjCounterLocset--; + break; + case XPATH_USERS: + xmlXPathDebugObjCounterUsers--; + break; + case XPATH_XSLT_TREE: + xmlXPathDebugObjCounterXSLTTree--; + break; + default: + break; + } + xmlXPathDebugObjCounterAll--; +} + +/* REVISIT TODO: Make this static when committing */ +static void +xmlXPathDebugObjUsageDisplay(xmlXPathContextPtr ctxt) +{ + int reqAll, reqNodeset, reqString, reqBool, reqNumber, + reqXSLTTree, reqUndefined; + int caAll = 0, caNodeset = 0, caString = 0, caBool = 0, + caNumber = 0, caXSLTTree = 0, caUndefined = 0; + int reAll = 0, reNodeset = 0, reString = 0, reBool = 0, + reNumber = 0, reXSLTTree = 0, reUndefined = 0; + int leftObjs = xmlXPathDebugObjCounterAll; + + reqAll = xmlXPathDebugObjTotalAll; + reqNodeset = xmlXPathDebugObjTotalNodeset; + reqString = xmlXPathDebugObjTotalString; + reqBool = xmlXPathDebugObjTotalBool; + reqNumber = xmlXPathDebugObjTotalNumber; + reqXSLTTree = xmlXPathDebugObjTotalXSLTTree; + reqUndefined = xmlXPathDebugObjTotalUndefined; + + printf("# XPath object usage:\n"); + + if (ctxt != NULL) { + if (ctxt->cache != NULL) { + xmlXPathContextCachePtr cache = + (xmlXPathContextCachePtr) ctxt->cache; + + reAll = cache->dbgReusedAll; + reqAll += reAll; + reNodeset = cache->dbgReusedNodeset; + reqNodeset += reNodeset; + reString = cache->dbgReusedString; + reqString += reString; + reBool = cache->dbgReusedBool; + reqBool += reBool; + reNumber = cache->dbgReusedNumber; + reqNumber += reNumber; + reXSLTTree = cache->dbgReusedXSLTTree; + reqXSLTTree += reXSLTTree; + reUndefined = cache->dbgReusedUndefined; + reqUndefined += reUndefined; + + caAll = cache->dbgCachedAll; + caBool = cache->dbgCachedBool; + caNodeset = cache->dbgCachedNodeset; + caString = cache->dbgCachedString; + caNumber = cache->dbgCachedNumber; + caXSLTTree = cache->dbgCachedXSLTTree; + caUndefined = cache->dbgCachedUndefined; + + if (cache->nodesetObjs) + leftObjs -= cache->nodesetObjs->number; + if (cache->stringObjs) + leftObjs -= cache->stringObjs->number; + if (cache->booleanObjs) + leftObjs -= cache->booleanObjs->number; + if (cache->numberObjs) + leftObjs -= cache->numberObjs->number; + if (cache->miscObjs) + leftObjs -= cache->miscObjs->number; + } + } + + printf("# all\n"); + printf("# total : %d\n", reqAll); + printf("# left : %d\n", leftObjs); + printf("# created: %d\n", xmlXPathDebugObjTotalAll); + printf("# reused : %d\n", reAll); + printf("# max : %d\n", xmlXPathDebugObjMaxAll); + + printf("# node-sets\n"); + printf("# total : %d\n", reqNodeset); + printf("# created: %d\n", xmlXPathDebugObjTotalNodeset); + printf("# reused : %d\n", reNodeset); + printf("# max : %d\n", xmlXPathDebugObjMaxNodeset); + + printf("# strings\n"); + printf("# total : %d\n", reqString); + printf("# created: %d\n", xmlXPathDebugObjTotalString); + printf("# reused : %d\n", reString); + printf("# max : %d\n", xmlXPathDebugObjMaxString); + + printf("# booleans\n"); + printf("# total : %d\n", reqBool); + printf("# created: %d\n", xmlXPathDebugObjTotalBool); + printf("# reused : %d\n", reBool); + printf("# max : %d\n", xmlXPathDebugObjMaxBool); + + printf("# numbers\n"); + printf("# total : %d\n", reqNumber); + printf("# created: %d\n", xmlXPathDebugObjTotalNumber); + printf("# reused : %d\n", reNumber); + printf("# max : %d\n", xmlXPathDebugObjMaxNumber); + + printf("# XSLT result tree fragments\n"); + printf("# total : %d\n", reqXSLTTree); + printf("# created: %d\n", xmlXPathDebugObjTotalXSLTTree); + printf("# reused : %d\n", reXSLTTree); + printf("# max : %d\n", xmlXPathDebugObjMaxXSLTTree); + + printf("# undefined\n"); + printf("# total : %d\n", reqUndefined); + printf("# created: %d\n", xmlXPathDebugObjTotalUndefined); + printf("# reused : %d\n", reUndefined); + printf("# max : %d\n", xmlXPathDebugObjMaxUndefined); + +} + +#endif /* XP_DEBUG_OBJ_USAGE */ + +#endif /* LIBXML_DEBUG_ENABLED */ + +/************************************************************************ + * * + * XPath object caching * + * * + ************************************************************************/ + +/** + * xmlXPathNewCache: + * + * Create a new object cache + * + * Returns the xmlXPathCache just allocated. + */ +static xmlXPathContextCachePtr +xmlXPathNewCache(void) +{ + xmlXPathContextCachePtr ret; + + ret = (xmlXPathContextCachePtr) xmlMalloc(sizeof(xmlXPathContextCache)); + if (ret == NULL) { + xmlXPathErrMemory(NULL, "creating object cache\n"); + return(NULL); + } + memset(ret, 0 , (size_t) sizeof(xmlXPathContextCache)); + ret->maxNodeset = 100; + ret->maxString = 100; + ret->maxBoolean = 100; + ret->maxNumber = 100; + ret->maxMisc = 100; + return(ret); +} + +static void +xmlXPathCacheFreeObjectList(xmlPointerListPtr list) +{ + int i; + xmlXPathObjectPtr obj; + + if (list == NULL) + return; + + for (i = 0; i < list->number; i++) { + obj = list->items[i]; + /* + * Note that it is already assured that we don't need to + * look out for namespace nodes in the node-set. + */ + if (obj->nodesetval != NULL) { + if (obj->nodesetval->nodeTab != NULL) + xmlFree(obj->nodesetval->nodeTab); + xmlFree(obj->nodesetval); + } + xmlFree(obj); +#ifdef XP_DEBUG_OBJ_USAGE + xmlXPathDebugObjCounterAll--; +#endif + } + xmlPointerListFree(list); +} + +static void +xmlXPathFreeCache(xmlXPathContextCachePtr cache) +{ + if (cache == NULL) + return; + if (cache->nodesetObjs) + xmlXPathCacheFreeObjectList(cache->nodesetObjs); + if (cache->stringObjs) + xmlXPathCacheFreeObjectList(cache->stringObjs); + if (cache->booleanObjs) + xmlXPathCacheFreeObjectList(cache->booleanObjs); + if (cache->numberObjs) + xmlXPathCacheFreeObjectList(cache->numberObjs); + if (cache->miscObjs) + xmlXPathCacheFreeObjectList(cache->miscObjs); + xmlFree(cache); +} + +/** + * xmlXPathContextSetCache: + * + * @ctxt: the XPath context + * @active: enables/disables (creates/frees) the cache + * @value: a value with semantics dependant on @options + * @options: options (currently only the value 0 is used) + * + * Creates/frees an object cache on the XPath context. + * If activates XPath objects (xmlXPathObject) will be cached internally + * to be reused. + * @options: + * 0: This will set the XPath object caching: + * @value: + * This will set the maximum number of XPath objects + * to be cached per slot + * There are 5 slots for: node-set, string, number, boolean, and + * misc objects. Use <0 for the default number (100). + * Other values for @options have currently no effect. + * + * Returns 0 if the setting succeeded, and -1 on API or internal errors. + */ +int +xmlXPathContextSetCache(xmlXPathContextPtr ctxt, + int active, + int value, + int options) +{ + if (ctxt == NULL) + return(-1); + if (active) { + xmlXPathContextCachePtr cache; + + if (ctxt->cache == NULL) { + ctxt->cache = xmlXPathNewCache(); + if (ctxt->cache == NULL) + return(-1); + } + cache = (xmlXPathContextCachePtr) ctxt->cache; + if (options == 0) { + if (value < 0) + value = 100; + cache->maxNodeset = value; + cache->maxString = value; + cache->maxNumber = value; + cache->maxBoolean = value; + cache->maxMisc = value; + } + } else if (ctxt->cache != NULL) { + xmlXPathFreeCache((xmlXPathContextCachePtr) ctxt->cache); + ctxt->cache = NULL; + } + return(0); +} + +/** + * xmlXPathCacheWrapNodeSet: + * @ctxt: the XPath context + * @val: the NodePtr value + * + * This is the cached version of xmlXPathWrapNodeSet(). + * Wrap the Nodeset @val in a new xmlXPathObjectPtr + * + * Returns the created or reused object. + */ +static xmlXPathObjectPtr +xmlXPathCacheWrapNodeSet(xmlXPathContextPtr ctxt, xmlNodeSetPtr val) +{ + if ((ctxt != NULL) && (ctxt->cache != NULL)) { + xmlXPathContextCachePtr cache = + (xmlXPathContextCachePtr) ctxt->cache; + + if ((cache->miscObjs != NULL) && + (cache->miscObjs->number != 0)) + { + xmlXPathObjectPtr ret; + + ret = (xmlXPathObjectPtr) + cache->miscObjs->items[--cache->miscObjs->number]; + ret->type = XPATH_NODESET; + ret->nodesetval = val; +#ifdef XP_DEBUG_OBJ_USAGE + xmlXPathDebugObjUsageRequested(ctxt, XPATH_NODESET); +#endif + return(ret); + } + } + + return(xmlXPathWrapNodeSet(val)); + +} + +/** + * xmlXPathCacheWrapString: + * @ctxt: the XPath context + * @val: the xmlChar * value + * + * This is the cached version of xmlXPathWrapString(). + * Wraps the @val string into an XPath object. + * + * Returns the created or reused object. + */ +static xmlXPathObjectPtr +xmlXPathCacheWrapString(xmlXPathContextPtr ctxt, xmlChar *val) +{ + if ((ctxt != NULL) && (ctxt->cache != NULL)) { + xmlXPathContextCachePtr cache = (xmlXPathContextCachePtr) ctxt->cache; + + if ((cache->stringObjs != NULL) && + (cache->stringObjs->number != 0)) + { + + xmlXPathObjectPtr ret; + + ret = (xmlXPathObjectPtr) + cache->stringObjs->items[--cache->stringObjs->number]; + ret->type = XPATH_STRING; + ret->stringval = val; +#ifdef XP_DEBUG_OBJ_USAGE + xmlXPathDebugObjUsageRequested(ctxt, XPATH_STRING); +#endif + return(ret); + } else if ((cache->miscObjs != NULL) && + (cache->miscObjs->number != 0)) + { + xmlXPathObjectPtr ret; + /* + * Fallback to misc-cache. + */ + ret = (xmlXPathObjectPtr) + cache->miscObjs->items[--cache->miscObjs->number]; + + ret->type = XPATH_STRING; + ret->stringval = val; +#ifdef XP_DEBUG_OBJ_USAGE + xmlXPathDebugObjUsageRequested(ctxt, XPATH_STRING); +#endif + return(ret); + } + } + return(xmlXPathWrapString(val)); +} + +/** + * xmlXPathCacheNewNodeSet: + * @ctxt: the XPath context + * @val: the NodePtr value + * + * This is the cached version of xmlXPathNewNodeSet(). + * Acquire an xmlXPathObjectPtr of type NodeSet and initialize + * it with the single Node @val + * + * Returns the created or reused object. + */ +static xmlXPathObjectPtr +xmlXPathCacheNewNodeSet(xmlXPathContextPtr ctxt, xmlNodePtr val) +{ + if ((ctxt != NULL) && (ctxt->cache)) { + xmlXPathContextCachePtr cache = (xmlXPathContextCachePtr) ctxt->cache; + + if ((cache->nodesetObjs != NULL) && + (cache->nodesetObjs->number != 0)) + { + xmlXPathObjectPtr ret; + /* + * Use the nodset-cache. + */ + ret = (xmlXPathObjectPtr) + cache->nodesetObjs->items[--cache->nodesetObjs->number]; + ret->type = XPATH_NODESET; + ret->boolval = 0; + if (val) { + if ((ret->nodesetval->nodeMax == 0) || + (val->type == XML_NAMESPACE_DECL)) + { + xmlXPathNodeSetAddUnique(ret->nodesetval, val); + } else { + ret->nodesetval->nodeTab[0] = val; + ret->nodesetval->nodeNr = 1; + } + } +#ifdef XP_DEBUG_OBJ_USAGE + xmlXPathDebugObjUsageRequested(ctxt, XPATH_NODESET); +#endif + return(ret); + } else if ((cache->miscObjs != NULL) && + (cache->miscObjs->number != 0)) + { + xmlXPathObjectPtr ret; + /* + * Fallback to misc-cache. + */ + + ret = (xmlXPathObjectPtr) + cache->miscObjs->items[--cache->miscObjs->number]; + + ret->type = XPATH_NODESET; + ret->boolval = 0; + ret->nodesetval = xmlXPathNodeSetCreate(val); + if (ret->nodesetval == NULL) { + ctxt->lastError.domain = XML_FROM_XPATH; + ctxt->lastError.code = XML_ERR_NO_MEMORY; + return(NULL); + } +#ifdef XP_DEBUG_OBJ_USAGE + xmlXPathDebugObjUsageRequested(ctxt, XPATH_NODESET); +#endif + return(ret); + } + } + return(xmlXPathNewNodeSet(val)); +} + +/** + * xmlXPathCacheNewCString: + * @ctxt: the XPath context + * @val: the char * value + * + * This is the cached version of xmlXPathNewCString(). + * Acquire an xmlXPathObjectPtr of type string and of value @val + * + * Returns the created or reused object. + */ +static xmlXPathObjectPtr +xmlXPathCacheNewCString(xmlXPathContextPtr ctxt, const char *val) +{ + if ((ctxt != NULL) && (ctxt->cache)) { + xmlXPathContextCachePtr cache = (xmlXPathContextCachePtr) ctxt->cache; + + if ((cache->stringObjs != NULL) && + (cache->stringObjs->number != 0)) + { + xmlXPathObjectPtr ret; + + ret = (xmlXPathObjectPtr) + cache->stringObjs->items[--cache->stringObjs->number]; + + ret->type = XPATH_STRING; + ret->stringval = xmlStrdup(BAD_CAST val); +#ifdef XP_DEBUG_OBJ_USAGE + xmlXPathDebugObjUsageRequested(ctxt, XPATH_STRING); +#endif + return(ret); + } else if ((cache->miscObjs != NULL) && + (cache->miscObjs->number != 0)) + { + xmlXPathObjectPtr ret; + + ret = (xmlXPathObjectPtr) + cache->miscObjs->items[--cache->miscObjs->number]; + + ret->type = XPATH_STRING; + ret->stringval = xmlStrdup(BAD_CAST val); +#ifdef XP_DEBUG_OBJ_USAGE + xmlXPathDebugObjUsageRequested(ctxt, XPATH_STRING); +#endif + return(ret); + } + } + return(xmlXPathNewCString(val)); +} + +/** + * xmlXPathCacheNewString: + * @ctxt: the XPath context + * @val: the xmlChar * value + * + * This is the cached version of xmlXPathNewString(). + * Acquire an xmlXPathObjectPtr of type string and of value @val + * + * Returns the created or reused object. + */ +static xmlXPathObjectPtr +xmlXPathCacheNewString(xmlXPathContextPtr ctxt, const xmlChar *val) +{ + if ((ctxt != NULL) && (ctxt->cache)) { + xmlXPathContextCachePtr cache = (xmlXPathContextCachePtr) ctxt->cache; + + if ((cache->stringObjs != NULL) && + (cache->stringObjs->number != 0)) + { + xmlXPathObjectPtr ret; + + ret = (xmlXPathObjectPtr) + cache->stringObjs->items[--cache->stringObjs->number]; + ret->type = XPATH_STRING; + if (val != NULL) + ret->stringval = xmlStrdup(val); + else + ret->stringval = xmlStrdup((const xmlChar *)""); +#ifdef XP_DEBUG_OBJ_USAGE + xmlXPathDebugObjUsageRequested(ctxt, XPATH_STRING); +#endif + return(ret); + } else if ((cache->miscObjs != NULL) && + (cache->miscObjs->number != 0)) + { + xmlXPathObjectPtr ret; + + ret = (xmlXPathObjectPtr) + cache->miscObjs->items[--cache->miscObjs->number]; + + ret->type = XPATH_STRING; + if (val != NULL) + ret->stringval = xmlStrdup(val); + else + ret->stringval = xmlStrdup((const xmlChar *)""); +#ifdef XP_DEBUG_OBJ_USAGE + xmlXPathDebugObjUsageRequested(ctxt, XPATH_STRING); +#endif + return(ret); + } + } + return(xmlXPathNewString(val)); +} + +/** + * xmlXPathCacheNewBoolean: + * @ctxt: the XPath context + * @val: the boolean value + * + * This is the cached version of xmlXPathNewBoolean(). + * Acquires an xmlXPathObjectPtr of type boolean and of value @val + * + * Returns the created or reused object. + */ +static xmlXPathObjectPtr +xmlXPathCacheNewBoolean(xmlXPathContextPtr ctxt, int val) +{ + if ((ctxt != NULL) && (ctxt->cache)) { + xmlXPathContextCachePtr cache = (xmlXPathContextCachePtr) ctxt->cache; + + if ((cache->booleanObjs != NULL) && + (cache->booleanObjs->number != 0)) + { + xmlXPathObjectPtr ret; + + ret = (xmlXPathObjectPtr) + cache->booleanObjs->items[--cache->booleanObjs->number]; + ret->type = XPATH_BOOLEAN; + ret->boolval = (val != 0); +#ifdef XP_DEBUG_OBJ_USAGE + xmlXPathDebugObjUsageRequested(ctxt, XPATH_BOOLEAN); +#endif + return(ret); + } else if ((cache->miscObjs != NULL) && + (cache->miscObjs->number != 0)) + { + xmlXPathObjectPtr ret; + + ret = (xmlXPathObjectPtr) + cache->miscObjs->items[--cache->miscObjs->number]; + + ret->type = XPATH_BOOLEAN; + ret->boolval = (val != 0); +#ifdef XP_DEBUG_OBJ_USAGE + xmlXPathDebugObjUsageRequested(ctxt, XPATH_BOOLEAN); +#endif + return(ret); + } + } + return(xmlXPathNewBoolean(val)); +} + +/** + * xmlXPathCacheNewFloat: + * @ctxt: the XPath context + * @val: the double value + * + * This is the cached version of xmlXPathNewFloat(). + * Acquires an xmlXPathObjectPtr of type double and of value @val + * + * Returns the created or reused object. + */ +static xmlXPathObjectPtr +xmlXPathCacheNewFloat(xmlXPathContextPtr ctxt, double val) +{ + if ((ctxt != NULL) && (ctxt->cache)) { + xmlXPathContextCachePtr cache = (xmlXPathContextCachePtr) ctxt->cache; + + if ((cache->numberObjs != NULL) && + (cache->numberObjs->number != 0)) + { + xmlXPathObjectPtr ret; + + ret = (xmlXPathObjectPtr) + cache->numberObjs->items[--cache->numberObjs->number]; + ret->type = XPATH_NUMBER; + ret->floatval = val; +#ifdef XP_DEBUG_OBJ_USAGE + xmlXPathDebugObjUsageRequested(ctxt, XPATH_NUMBER); +#endif + return(ret); + } else if ((cache->miscObjs != NULL) && + (cache->miscObjs->number != 0)) + { + xmlXPathObjectPtr ret; + + ret = (xmlXPathObjectPtr) + cache->miscObjs->items[--cache->miscObjs->number]; + + ret->type = XPATH_NUMBER; + ret->floatval = val; +#ifdef XP_DEBUG_OBJ_USAGE + xmlXPathDebugObjUsageRequested(ctxt, XPATH_NUMBER); +#endif + return(ret); + } + } + return(xmlXPathNewFloat(val)); +} + +/** + * xmlXPathCacheConvertString: + * @ctxt: the XPath context + * @val: an XPath object + * + * This is the cached version of xmlXPathConvertString(). + * Converts an existing object to its string() equivalent + * + * Returns a created or reused object, the old one is freed (cached) + * (or the operation is done directly on @val) + */ + +static xmlXPathObjectPtr +xmlXPathCacheConvertString(xmlXPathContextPtr ctxt, xmlXPathObjectPtr val) { + xmlChar *res = NULL; + + if (val == NULL) + return(xmlXPathCacheNewCString(ctxt, "")); + + switch (val->type) { + case XPATH_UNDEFINED: +#ifdef DEBUG_EXPR + xmlGenericError(xmlGenericErrorContext, "STRING: undefined\n"); +#endif + break; + case XPATH_NODESET: + case XPATH_XSLT_TREE: + res = xmlXPathCastNodeSetToString(val->nodesetval); + break; + case XPATH_STRING: + return(val); + case XPATH_BOOLEAN: + res = xmlXPathCastBooleanToString(val->boolval); + break; + case XPATH_NUMBER: + res = xmlXPathCastNumberToString(val->floatval); + break; + case XPATH_USERS: + case XPATH_POINT: + case XPATH_RANGE: + case XPATH_LOCATIONSET: + TODO; + break; + } + xmlXPathReleaseObject(ctxt, val); + if (res == NULL) + return(xmlXPathCacheNewCString(ctxt, "")); + return(xmlXPathCacheWrapString(ctxt, res)); +} + +/** + * xmlXPathCacheObjectCopy: + * @ctxt: the XPath context + * @val: the original object + * + * This is the cached version of xmlXPathObjectCopy(). + * Acquire a copy of a given object + * + * Returns a created or reused created object. + */ +static xmlXPathObjectPtr +xmlXPathCacheObjectCopy(xmlXPathContextPtr ctxt, xmlXPathObjectPtr val) +{ + if (val == NULL) + return(NULL); + + if (XP_HAS_CACHE(ctxt)) { + switch (val->type) { + case XPATH_NODESET: + return(xmlXPathCacheWrapNodeSet(ctxt, + xmlXPathNodeSetMerge(NULL, val->nodesetval))); + case XPATH_STRING: + return(xmlXPathCacheNewString(ctxt, val->stringval)); + case XPATH_BOOLEAN: + return(xmlXPathCacheNewBoolean(ctxt, val->boolval)); + case XPATH_NUMBER: + return(xmlXPathCacheNewFloat(ctxt, val->floatval)); + default: + break; + } + } + return(xmlXPathObjectCopy(val)); +} + +/** + * xmlXPathCacheConvertBoolean: + * @ctxt: the XPath context + * @val: an XPath object + * + * This is the cached version of xmlXPathConvertBoolean(). + * Converts an existing object to its boolean() equivalent + * + * Returns a created or reused object, the old one is freed (or the operation + * is done directly on @val) + */ +static xmlXPathObjectPtr +xmlXPathCacheConvertBoolean(xmlXPathContextPtr ctxt, xmlXPathObjectPtr val) { + xmlXPathObjectPtr ret; + + if (val == NULL) + return(xmlXPathCacheNewBoolean(ctxt, 0)); + if (val->type == XPATH_BOOLEAN) + return(val); + ret = xmlXPathCacheNewBoolean(ctxt, xmlXPathCastToBoolean(val)); + xmlXPathReleaseObject(ctxt, val); + return(ret); +} + +/** + * xmlXPathCacheConvertNumber: + * @ctxt: the XPath context + * @val: an XPath object + * + * This is the cached version of xmlXPathConvertNumber(). + * Converts an existing object to its number() equivalent + * + * Returns a created or reused object, the old one is freed (or the operation + * is done directly on @val) + */ +static xmlXPathObjectPtr +xmlXPathCacheConvertNumber(xmlXPathContextPtr ctxt, xmlXPathObjectPtr val) { + xmlXPathObjectPtr ret; + + if (val == NULL) + return(xmlXPathCacheNewFloat(ctxt, 0.0)); + if (val->type == XPATH_NUMBER) + return(val); + ret = xmlXPathCacheNewFloat(ctxt, xmlXPathCastToNumber(val)); + xmlXPathReleaseObject(ctxt, val); + return(ret); +} + +/************************************************************************ + * * + * Parser stacks related functions and macros * + * * + ************************************************************************/ + +/** + * xmlXPathSetFrame: + * @ctxt: an XPath parser context + * + * Set the callee evaluation frame + * + * Returns the previous frame value to be restored once done + */ +static int +xmlXPathSetFrame(xmlXPathParserContextPtr ctxt) { + int ret; + + if (ctxt == NULL) + return(0); + ret = ctxt->valueFrame; + ctxt->valueFrame = ctxt->valueNr; + return(ret); +} + +/** + * xmlXPathPopFrame: + * @ctxt: an XPath parser context + * @frame: the previous frame value + * + * Remove the callee evaluation frame + */ +static void +xmlXPathPopFrame(xmlXPathParserContextPtr ctxt, int frame) { + if (ctxt == NULL) + return; + if (ctxt->valueNr < ctxt->valueFrame) { + xmlXPatherror(ctxt, __FILE__, __LINE__, XPATH_STACK_ERROR); + } + ctxt->valueFrame = frame; +} + +/** + * valuePop: + * @ctxt: an XPath evaluation context + * + * Pops the top XPath object from the value stack + * + * Returns the XPath object just removed + */ +xmlXPathObjectPtr +valuePop(xmlXPathParserContextPtr ctxt) +{ + xmlXPathObjectPtr ret; + + if ((ctxt == NULL) || (ctxt->valueNr <= 0)) + return (NULL); + + if (ctxt->valueNr <= ctxt->valueFrame) { + xmlXPatherror(ctxt, __FILE__, __LINE__, XPATH_STACK_ERROR); + return (NULL); + } + + ctxt->valueNr--; + if (ctxt->valueNr > 0) + ctxt->value = ctxt->valueTab[ctxt->valueNr - 1]; + else + ctxt->value = NULL; + ret = ctxt->valueTab[ctxt->valueNr]; + ctxt->valueTab[ctxt->valueNr] = NULL; + return (ret); +} +/** + * valuePush: + * @ctxt: an XPath evaluation context + * @value: the XPath object + * + * Pushes a new XPath object on top of the value stack + * + * returns the number of items on the value stack + */ +int +valuePush(xmlXPathParserContextPtr ctxt, xmlXPathObjectPtr value) +{ + if ((ctxt == NULL) || (value == NULL)) return(-1); + if (ctxt->valueNr >= ctxt->valueMax) { + xmlXPathObjectPtr *tmp; + + if (ctxt->valueMax >= XPATH_MAX_STACK_DEPTH) { + xmlXPathErrMemory(NULL, "XPath stack depth limit reached\n"); + ctxt->error = XPATH_MEMORY_ERROR; + return (0); + } + tmp = (xmlXPathObjectPtr *) xmlRealloc(ctxt->valueTab, + 2 * ctxt->valueMax * + sizeof(ctxt->valueTab[0])); + if (tmp == NULL) { + xmlXPathErrMemory(NULL, "pushing value\n"); + ctxt->error = XPATH_MEMORY_ERROR; + return (0); + } + ctxt->valueMax *= 2; + ctxt->valueTab = tmp; + } + ctxt->valueTab[ctxt->valueNr] = value; + ctxt->value = value; + return (ctxt->valueNr++); +} + +/** + * xmlXPathPopBoolean: + * @ctxt: an XPath parser context + * + * Pops a boolean from the stack, handling conversion if needed. + * Check error with #xmlXPathCheckError. + * + * Returns the boolean + */ +int +xmlXPathPopBoolean (xmlXPathParserContextPtr ctxt) { + xmlXPathObjectPtr obj; + int ret; + + obj = valuePop(ctxt); + if (obj == NULL) { + xmlXPathSetError(ctxt, XPATH_INVALID_OPERAND); + return(0); + } + if (obj->type != XPATH_BOOLEAN) + ret = xmlXPathCastToBoolean(obj); + else + ret = obj->boolval; + xmlXPathReleaseObject(ctxt->context, obj); + return(ret); +} + +/** + * xmlXPathPopNumber: + * @ctxt: an XPath parser context + * + * Pops a number from the stack, handling conversion if needed. + * Check error with #xmlXPathCheckError. + * + * Returns the number + */ +double +xmlXPathPopNumber (xmlXPathParserContextPtr ctxt) { + xmlXPathObjectPtr obj; + double ret; + + obj = valuePop(ctxt); + if (obj == NULL) { + xmlXPathSetError(ctxt, XPATH_INVALID_OPERAND); + return(0); + } + if (obj->type != XPATH_NUMBER) + ret = xmlXPathCastToNumber(obj); + else + ret = obj->floatval; + xmlXPathReleaseObject(ctxt->context, obj); + return(ret); +} + +/** + * xmlXPathPopString: + * @ctxt: an XPath parser context + * + * Pops a string from the stack, handling conversion if needed. + * Check error with #xmlXPathCheckError. + * + * Returns the string + */ +xmlChar * +xmlXPathPopString (xmlXPathParserContextPtr ctxt) { + xmlXPathObjectPtr obj; + xmlChar * ret; + + obj = valuePop(ctxt); + if (obj == NULL) { + xmlXPathSetError(ctxt, XPATH_INVALID_OPERAND); + return(NULL); + } + ret = xmlXPathCastToString(obj); /* this does required strdup */ + /* TODO: needs refactoring somewhere else */ + if (obj->stringval == ret) + obj->stringval = NULL; + xmlXPathReleaseObject(ctxt->context, obj); + return(ret); +} + +/** + * xmlXPathPopNodeSet: + * @ctxt: an XPath parser context + * + * Pops a node-set from the stack, handling conversion if needed. + * Check error with #xmlXPathCheckError. + * + * Returns the node-set + */ +xmlNodeSetPtr +xmlXPathPopNodeSet (xmlXPathParserContextPtr ctxt) { + xmlXPathObjectPtr obj; + xmlNodeSetPtr ret; + + if (ctxt == NULL) return(NULL); + if (ctxt->value == NULL) { + xmlXPathSetError(ctxt, XPATH_INVALID_OPERAND); + return(NULL); + } + if (!xmlXPathStackIsNodeSet(ctxt)) { + xmlXPathSetTypeError(ctxt); + return(NULL); + } + obj = valuePop(ctxt); + ret = obj->nodesetval; +#if 0 + /* to fix memory leak of not clearing obj->user */ + if (obj->boolval && obj->user != NULL) + xmlFreeNodeList((xmlNodePtr) obj->user); +#endif + obj->nodesetval = NULL; + xmlXPathReleaseObject(ctxt->context, obj); + return(ret); +} + +/** + * xmlXPathPopExternal: + * @ctxt: an XPath parser context + * + * Pops an external object from the stack, handling conversion if needed. + * Check error with #xmlXPathCheckError. + * + * Returns the object + */ +void * +xmlXPathPopExternal (xmlXPathParserContextPtr ctxt) { + xmlXPathObjectPtr obj; + void * ret; + + if ((ctxt == NULL) || (ctxt->value == NULL)) { + xmlXPathSetError(ctxt, XPATH_INVALID_OPERAND); + return(NULL); + } + if (ctxt->value->type != XPATH_USERS) { + xmlXPathSetTypeError(ctxt); + return(NULL); + } + obj = valuePop(ctxt); + ret = obj->user; + obj->user = NULL; + xmlXPathReleaseObject(ctxt->context, obj); + return(ret); +} + +/* + * Macros for accessing the content. Those should be used only by the parser, + * and not exported. + * + * Dirty macros, i.e. one need to make assumption on the context to use them + * + * CUR_PTR return the current pointer to the xmlChar to be parsed. + * CUR returns the current xmlChar value, i.e. a 8 bit value + * in ISO-Latin or UTF-8. + * This should be used internally by the parser + * only to compare to ASCII values otherwise it would break when + * running with UTF-8 encoding. + * NXT(n) returns the n'th next xmlChar. Same as CUR is should be used only + * to compare on ASCII based substring. + * SKIP(n) Skip n xmlChar, and must also be used only to skip ASCII defined + * strings within the parser. + * CURRENT Returns the current char value, with the full decoding of + * UTF-8 if we are using this mode. It returns an int. + * NEXT Skip to the next character, this does the proper decoding + * in UTF-8 mode. It also pop-up unfinished entities on the fly. + * It returns the pointer to the current xmlChar. + */ + +#define CUR (*ctxt->cur) +#define SKIP(val) ctxt->cur += (val) +#define NXT(val) ctxt->cur[(val)] +#define CUR_PTR ctxt->cur +#define CUR_CHAR(l) xmlXPathCurrentChar(ctxt, &l) + +#define COPY_BUF(l,b,i,v) \ + if (l == 1) b[i++] = (xmlChar) v; \ + else i += xmlCopyChar(l,&b[i],v) + +#define NEXTL(l) ctxt->cur += l + +#define SKIP_BLANKS \ + while (IS_BLANK_CH(*(ctxt->cur))) NEXT + +#define CURRENT (*ctxt->cur) +#define NEXT ((*ctxt->cur) ? ctxt->cur++: ctxt->cur) + + +#ifndef DBL_DIG +#define DBL_DIG 16 +#endif +#ifndef DBL_EPSILON +#define DBL_EPSILON 1E-9 +#endif + +#define UPPER_DOUBLE 1E9 +#define LOWER_DOUBLE 1E-5 +#define LOWER_DOUBLE_EXP 5 + +#define INTEGER_DIGITS DBL_DIG +#define FRACTION_DIGITS (DBL_DIG + 1 + (LOWER_DOUBLE_EXP)) +#define EXPONENT_DIGITS (3 + 2) + +/** + * xmlXPathFormatNumber: + * @number: number to format + * @buffer: output buffer + * @buffersize: size of output buffer + * + * Convert the number into a string representation. + */ +static void +xmlXPathFormatNumber(double number, char buffer[], int buffersize) +{ + switch (xmlXPathIsInf(number)) { + case 1: + if (buffersize > (int)sizeof("Infinity")) + snprintf(buffer, buffersize, "Infinity"); + break; + case -1: + if (buffersize > (int)sizeof("-Infinity")) + snprintf(buffer, buffersize, "-Infinity"); + break; + default: + if (xmlXPathIsNaN(number)) { + if (buffersize > (int)sizeof("NaN")) + snprintf(buffer, buffersize, "NaN"); + } else if (number == 0 && xmlXPathGetSign(number) != 0) { + snprintf(buffer, buffersize, "0"); + } else if (number == ((int) number)) { + char work[30]; + char *ptr, *cur; + int value = (int) number; + + ptr = &buffer[0]; + if (value == 0) { + *ptr++ = '0'; + } else { + snprintf(work, 29, "%d", value); + cur = &work[0]; + while ((*cur) && (ptr - buffer < buffersize)) { + *ptr++ = *cur++; + } + } + if (ptr - buffer < buffersize) { + *ptr = 0; + } else if (buffersize > 0) { + ptr--; + *ptr = 0; + } + } else { + /* + For the dimension of work, + DBL_DIG is number of significant digits + EXPONENT is only needed for "scientific notation" + 3 is sign, decimal point, and terminating zero + LOWER_DOUBLE_EXP is max number of leading zeroes in fraction + Note that this dimension is slightly (a few characters) + larger than actually necessary. + */ + char work[DBL_DIG + EXPONENT_DIGITS + 3 + LOWER_DOUBLE_EXP]; + int integer_place, fraction_place; + char *ptr; + char *after_fraction; + double absolute_value; + int size; + + absolute_value = fabs(number); + + /* + * First choose format - scientific or regular floating point. + * In either case, result is in work, and after_fraction points + * just past the fractional part. + */ + if ( ((absolute_value > UPPER_DOUBLE) || + (absolute_value < LOWER_DOUBLE)) && + (absolute_value != 0.0) ) { + /* Use scientific notation */ + integer_place = DBL_DIG + EXPONENT_DIGITS + 1; + fraction_place = DBL_DIG - 1; + size = snprintf(work, sizeof(work),"%*.*e", + integer_place, fraction_place, number); + while ((size > 0) && (work[size] != 'e')) size--; + + } + else { + /* Use regular notation */ + if (absolute_value > 0.0) { + integer_place = (int)log10(absolute_value); + if (integer_place > 0) + fraction_place = DBL_DIG - integer_place - 1; + else + fraction_place = DBL_DIG - integer_place; + } else { + fraction_place = 1; + } + size = snprintf(work, sizeof(work), "%0.*f", + fraction_place, number); + } + + /* Remove leading spaces sometimes inserted by snprintf */ + while (work[0] == ' ') { + for (ptr = &work[0];(ptr[0] = ptr[1]);ptr++); + size--; + } + + /* Remove fractional trailing zeroes */ + after_fraction = work + size; + ptr = after_fraction; + while (*(--ptr) == '0') + ; + if (*ptr != '.') + ptr++; + while ((*ptr++ = *after_fraction++) != 0); + + /* Finally copy result back to caller */ + size = strlen(work) + 1; + if (size > buffersize) { + work[buffersize - 1] = 0; + size = buffersize; + } + memmove(buffer, work, size); + } + break; + } +} + + +/************************************************************************ + * * + * Routines to handle NodeSets * + * * + ************************************************************************/ + +/** + * xmlXPathOrderDocElems: + * @doc: an input document + * + * Call this routine to speed up XPath computation on static documents. + * This stamps all the element nodes with the document order + * Like for line information, the order is kept in the element->content + * field, the value stored is actually - the node number (starting at -1) + * to be able to differentiate from line numbers. + * + * Returns the number of elements found in the document or -1 in case + * of error. + */ +long +xmlXPathOrderDocElems(xmlDocPtr doc) { + long count = 0; + xmlNodePtr cur; + + if (doc == NULL) + return(-1); + cur = doc->children; + while (cur != NULL) { + if (cur->type == XML_ELEMENT_NODE) { + cur->content = (void *) (-(++count)); + if (cur->children != NULL) { + cur = cur->children; + continue; + } + } + if (cur->next != NULL) { + cur = cur->next; + continue; + } + do { + cur = cur->parent; + if (cur == NULL) + break; + if (cur == (xmlNodePtr) doc) { + cur = NULL; + break; + } + if (cur->next != NULL) { + cur = cur->next; + break; + } + } while (cur != NULL); + } + return(count); +} + +/** + * xmlXPathCmpNodes: + * @node1: the first node + * @node2: the second node + * + * Compare two nodes w.r.t document order + * + * Returns -2 in case of error 1 if first point < second point, 0 if + * it's the same node, -1 otherwise + */ +int +xmlXPathCmpNodes(xmlNodePtr node1, xmlNodePtr node2) { + int depth1, depth2; + int attr1 = 0, attr2 = 0; + xmlNodePtr attrNode1 = NULL, attrNode2 = NULL; + xmlNodePtr cur, root; + + if ((node1 == NULL) || (node2 == NULL)) + return(-2); + /* + * a couple of optimizations which will avoid computations in most cases + */ + if (node1 == node2) /* trivial case */ + return(0); + if (node1->type == XML_ATTRIBUTE_NODE) { + attr1 = 1; + attrNode1 = node1; + node1 = node1->parent; + } + if (node2->type == XML_ATTRIBUTE_NODE) { + attr2 = 1; + attrNode2 = node2; + node2 = node2->parent; + } + if (node1 == node2) { + if (attr1 == attr2) { + /* not required, but we keep attributes in order */ + if (attr1 != 0) { + cur = attrNode2->prev; + while (cur != NULL) { + if (cur == attrNode1) + return (1); + cur = cur->prev; + } + return (-1); + } + return(0); + } + if (attr2 == 1) + return(1); + return(-1); + } + if ((node1->type == XML_NAMESPACE_DECL) || + (node2->type == XML_NAMESPACE_DECL)) + return(1); + if (node1 == node2->prev) + return(1); + if (node1 == node2->next) + return(-1); + + /* + * Speedup using document order if availble. + */ + if ((node1->type == XML_ELEMENT_NODE) && + (node2->type == XML_ELEMENT_NODE) && + (0 > (long) node1->content) && + (0 > (long) node2->content) && + (node1->doc == node2->doc)) { + long l1, l2; + + l1 = -((long) node1->content); + l2 = -((long) node2->content); + if (l1 < l2) + return(1); + if (l1 > l2) + return(-1); + } + + /* + * compute depth to root + */ + for (depth2 = 0, cur = node2;cur->parent != NULL;cur = cur->parent) { + if (cur == node1) + return(1); + depth2++; + } + root = cur; + for (depth1 = 0, cur = node1;cur->parent != NULL;cur = cur->parent) { + if (cur == node2) + return(-1); + depth1++; + } + /* + * Distinct document (or distinct entities :-( ) case. + */ + if (root != cur) { + return(-2); + } + /* + * get the nearest common ancestor. + */ + while (depth1 > depth2) { + depth1--; + node1 = node1->parent; + } + while (depth2 > depth1) { + depth2--; + node2 = node2->parent; + } + while (node1->parent != node2->parent) { + node1 = node1->parent; + node2 = node2->parent; + /* should not happen but just in case ... */ + if ((node1 == NULL) || (node2 == NULL)) + return(-2); + } + /* + * Find who's first. + */ + if (node1 == node2->prev) + return(1); + if (node1 == node2->next) + return(-1); + /* + * Speedup using document order if availble. + */ + if ((node1->type == XML_ELEMENT_NODE) && + (node2->type == XML_ELEMENT_NODE) && + (0 > (long) node1->content) && + (0 > (long) node2->content) && + (node1->doc == node2->doc)) { + long l1, l2; + + l1 = -((long) node1->content); + l2 = -((long) node2->content); + if (l1 < l2) + return(1); + if (l1 > l2) + return(-1); + } + + for (cur = node1->next;cur != NULL;cur = cur->next) + if (cur == node2) + return(1); + return(-1); /* assume there is no sibling list corruption */ +} + +/** + * xmlXPathNodeSetSort: + * @set: the node set + * + * Sort the node set in document order + */ +void +xmlXPathNodeSetSort(xmlNodeSetPtr set) { +#ifndef WITH_TIM_SORT + int i, j, incr, len; + xmlNodePtr tmp; +#endif + + if (set == NULL) + return; + +#ifndef WITH_TIM_SORT + /* + * Use the old Shell's sort implementation to sort the node-set + * Timsort ought to be quite faster + */ + len = set->nodeNr; + for (incr = len / 2; incr > 0; incr /= 2) { + for (i = incr; i < len; i++) { + j = i - incr; + while (j >= 0) { +#ifdef XP_OPTIMIZED_NON_ELEM_COMPARISON + if (xmlXPathCmpNodesExt(set->nodeTab[j], + set->nodeTab[j + incr]) == -1) +#else + if (xmlXPathCmpNodes(set->nodeTab[j], + set->nodeTab[j + incr]) == -1) +#endif + { + tmp = set->nodeTab[j]; + set->nodeTab[j] = set->nodeTab[j + incr]; + set->nodeTab[j + incr] = tmp; + j -= incr; + } else + break; + } + } + } +#else /* WITH_TIM_SORT */ + libxml_domnode_tim_sort(set->nodeTab, set->nodeNr); +#endif /* WITH_TIM_SORT */ +} + +#define XML_NODESET_DEFAULT 10 +/** + * xmlXPathNodeSetDupNs: + * @node: the parent node of the namespace XPath node + * @ns: the libxml namespace declaration node. + * + * Namespace node in libxml don't match the XPath semantic. In a node set + * the namespace nodes are duplicated and the next pointer is set to the + * parent node in the XPath semantic. + * + * Returns the newly created object. + */ +static xmlNodePtr +xmlXPathNodeSetDupNs(xmlNodePtr node, xmlNsPtr ns) { + xmlNsPtr cur; + + if ((ns == NULL) || (ns->type != XML_NAMESPACE_DECL)) + return(NULL); + if ((node == NULL) || (node->type == XML_NAMESPACE_DECL)) + return((xmlNodePtr) ns); + + /* + * Allocate a new Namespace and fill the fields. + */ + cur = (xmlNsPtr) xmlMalloc(sizeof(xmlNs)); + if (cur == NULL) { + xmlXPathErrMemory(NULL, "duplicating namespace\n"); + return(NULL); + } + memset(cur, 0, sizeof(xmlNs)); + cur->type = XML_NAMESPACE_DECL; + if (ns->href != NULL) + cur->href = xmlStrdup(ns->href); + if (ns->prefix != NULL) + cur->prefix = xmlStrdup(ns->prefix); + cur->next = (xmlNsPtr) node; + return((xmlNodePtr) cur); +} + +/** + * xmlXPathNodeSetFreeNs: + * @ns: the XPath namespace node found in a nodeset. + * + * Namespace nodes in libxml don't match the XPath semantic. In a node set + * the namespace nodes are duplicated and the next pointer is set to the + * parent node in the XPath semantic. Check if such a node needs to be freed + */ +void +xmlXPathNodeSetFreeNs(xmlNsPtr ns) { + if ((ns == NULL) || (ns->type != XML_NAMESPACE_DECL)) + return; + + if ((ns->next != NULL) && (ns->next->type != XML_NAMESPACE_DECL)) { + if (ns->href != NULL) + xmlFree((xmlChar *)ns->href); + if (ns->prefix != NULL) + xmlFree((xmlChar *)ns->prefix); + xmlFree(ns); + } +} + +/** + * xmlXPathNodeSetCreate: + * @val: an initial xmlNodePtr, or NULL + * + * Create a new xmlNodeSetPtr of type double and of value @val + * + * Returns the newly created object. + */ +xmlNodeSetPtr +xmlXPathNodeSetCreate(xmlNodePtr val) { + xmlNodeSetPtr ret; + + ret = (xmlNodeSetPtr) xmlMalloc(sizeof(xmlNodeSet)); + if (ret == NULL) { + xmlXPathErrMemory(NULL, "creating nodeset\n"); + return(NULL); + } + memset(ret, 0 , (size_t) sizeof(xmlNodeSet)); + if (val != NULL) { + ret->nodeTab = (xmlNodePtr *) xmlMalloc(XML_NODESET_DEFAULT * + sizeof(xmlNodePtr)); + if (ret->nodeTab == NULL) { + xmlXPathErrMemory(NULL, "creating nodeset\n"); + xmlFree(ret); + return(NULL); + } + memset(ret->nodeTab, 0 , + XML_NODESET_DEFAULT * (size_t) sizeof(xmlNodePtr)); + ret->nodeMax = XML_NODESET_DEFAULT; + if (val->type == XML_NAMESPACE_DECL) { + xmlNsPtr ns = (xmlNsPtr) val; + + ret->nodeTab[ret->nodeNr++] = + xmlXPathNodeSetDupNs((xmlNodePtr) ns->next, ns); + } else + ret->nodeTab[ret->nodeNr++] = val; + } + return(ret); +} + +/** + * xmlXPathNodeSetCreateSize: + * @size: the initial size of the set + * + * Create a new xmlNodeSetPtr of type double and of value @val + * + * Returns the newly created object. + */ +static xmlNodeSetPtr +xmlXPathNodeSetCreateSize(int size) { + xmlNodeSetPtr ret; + + ret = (xmlNodeSetPtr) xmlMalloc(sizeof(xmlNodeSet)); + if (ret == NULL) { + xmlXPathErrMemory(NULL, "creating nodeset\n"); + return(NULL); + } + memset(ret, 0 , (size_t) sizeof(xmlNodeSet)); + if (size < XML_NODESET_DEFAULT) + size = XML_NODESET_DEFAULT; + ret->nodeTab = (xmlNodePtr *) xmlMalloc(size * sizeof(xmlNodePtr)); + if (ret->nodeTab == NULL) { + xmlXPathErrMemory(NULL, "creating nodeset\n"); + xmlFree(ret); + return(NULL); + } + memset(ret->nodeTab, 0 , size * (size_t) sizeof(xmlNodePtr)); + ret->nodeMax = size; + return(ret); +} + +/** + * xmlXPathNodeSetContains: + * @cur: the node-set + * @val: the node + * + * checks whether @cur contains @val + * + * Returns true (1) if @cur contains @val, false (0) otherwise + */ +int +xmlXPathNodeSetContains (xmlNodeSetPtr cur, xmlNodePtr val) { + int i; + + if ((cur == NULL) || (val == NULL)) return(0); + if (val->type == XML_NAMESPACE_DECL) { + for (i = 0; i < cur->nodeNr; i++) { + if (cur->nodeTab[i]->type == XML_NAMESPACE_DECL) { + xmlNsPtr ns1, ns2; + + ns1 = (xmlNsPtr) val; + ns2 = (xmlNsPtr) cur->nodeTab[i]; + if (ns1 == ns2) + return(1); + if ((ns1->next != NULL) && (ns2->next == ns1->next) && + (xmlStrEqual(ns1->prefix, ns2->prefix))) + return(1); + } + } + } else { + for (i = 0; i < cur->nodeNr; i++) { + if (cur->nodeTab[i] == val) + return(1); + } + } + return(0); +} + +/** + * xmlXPathNodeSetAddNs: + * @cur: the initial node set + * @node: the hosting node + * @ns: a the namespace node + * + * add a new namespace node to an existing NodeSet + * + * Returns 0 in case of success and -1 in case of error + */ +int +xmlXPathNodeSetAddNs(xmlNodeSetPtr cur, xmlNodePtr node, xmlNsPtr ns) { + int i; + + + if ((cur == NULL) || (ns == NULL) || (node == NULL) || + (ns->type != XML_NAMESPACE_DECL) || + (node->type != XML_ELEMENT_NODE)) + return(-1); + + /* @@ with_ns to check whether namespace nodes should be looked at @@ */ + /* + * prevent duplicates + */ + for (i = 0;i < cur->nodeNr;i++) { + if ((cur->nodeTab[i] != NULL) && + (cur->nodeTab[i]->type == XML_NAMESPACE_DECL) && + (((xmlNsPtr)cur->nodeTab[i])->next == (xmlNsPtr) node) && + (xmlStrEqual(ns->prefix, ((xmlNsPtr)cur->nodeTab[i])->prefix))) + return(0); + } + + /* + * grow the nodeTab if needed + */ + if (cur->nodeMax == 0) { + cur->nodeTab = (xmlNodePtr *) xmlMalloc(XML_NODESET_DEFAULT * + sizeof(xmlNodePtr)); + if (cur->nodeTab == NULL) { + xmlXPathErrMemory(NULL, "growing nodeset\n"); + return(-1); + } + memset(cur->nodeTab, 0 , + XML_NODESET_DEFAULT * (size_t) sizeof(xmlNodePtr)); + cur->nodeMax = XML_NODESET_DEFAULT; + } else if (cur->nodeNr == cur->nodeMax) { + xmlNodePtr *temp; + + if (cur->nodeMax >= XPATH_MAX_NODESET_LENGTH) { + xmlXPathErrMemory(NULL, "growing nodeset hit limit\n"); + return(-1); + } + temp = (xmlNodePtr *) xmlRealloc(cur->nodeTab, cur->nodeMax * 2 * + sizeof(xmlNodePtr)); + if (temp == NULL) { + xmlXPathErrMemory(NULL, "growing nodeset\n"); + return(-1); + } + cur->nodeMax *= 2; + cur->nodeTab = temp; + } + cur->nodeTab[cur->nodeNr++] = xmlXPathNodeSetDupNs(node, ns); + return(0); +} + +/** + * xmlXPathNodeSetAdd: + * @cur: the initial node set + * @val: a new xmlNodePtr + * + * add a new xmlNodePtr to an existing NodeSet + * + * Returns 0 in case of success, and -1 in case of error + */ +int +xmlXPathNodeSetAdd(xmlNodeSetPtr cur, xmlNodePtr val) { + int i; + + if ((cur == NULL) || (val == NULL)) return(-1); + + /* @@ with_ns to check whether namespace nodes should be looked at @@ */ + /* + * prevent duplicates + */ + for (i = 0;i < cur->nodeNr;i++) + if (cur->nodeTab[i] == val) return(0); + + /* + * grow the nodeTab if needed + */ + if (cur->nodeMax == 0) { + cur->nodeTab = (xmlNodePtr *) xmlMalloc(XML_NODESET_DEFAULT * + sizeof(xmlNodePtr)); + if (cur->nodeTab == NULL) { + xmlXPathErrMemory(NULL, "growing nodeset\n"); + return(-1); + } + memset(cur->nodeTab, 0 , + XML_NODESET_DEFAULT * (size_t) sizeof(xmlNodePtr)); + cur->nodeMax = XML_NODESET_DEFAULT; + } else if (cur->nodeNr == cur->nodeMax) { + xmlNodePtr *temp; + + if (cur->nodeMax >= XPATH_MAX_NODESET_LENGTH) { + xmlXPathErrMemory(NULL, "growing nodeset hit limit\n"); + return(-1); + } + temp = (xmlNodePtr *) xmlRealloc(cur->nodeTab, cur->nodeMax * 2 * + sizeof(xmlNodePtr)); + if (temp == NULL) { + xmlXPathErrMemory(NULL, "growing nodeset\n"); + return(-1); + } + cur->nodeMax *= 2; + cur->nodeTab = temp; + } + if (val->type == XML_NAMESPACE_DECL) { + xmlNsPtr ns = (xmlNsPtr) val; + + cur->nodeTab[cur->nodeNr++] = + xmlXPathNodeSetDupNs((xmlNodePtr) ns->next, ns); + } else + cur->nodeTab[cur->nodeNr++] = val; + return(0); +} + +/** + * xmlXPathNodeSetAddUnique: + * @cur: the initial node set + * @val: a new xmlNodePtr + * + * add a new xmlNodePtr to an existing NodeSet, optimized version + * when we are sure the node is not already in the set. + * + * Returns 0 in case of success and -1 in case of failure + */ +int +xmlXPathNodeSetAddUnique(xmlNodeSetPtr cur, xmlNodePtr val) { + if ((cur == NULL) || (val == NULL)) return(-1); + + /* @@ with_ns to check whether namespace nodes should be looked at @@ */ + /* + * grow the nodeTab if needed + */ + if (cur->nodeMax == 0) { + cur->nodeTab = (xmlNodePtr *) xmlMalloc(XML_NODESET_DEFAULT * + sizeof(xmlNodePtr)); + if (cur->nodeTab == NULL) { + xmlXPathErrMemory(NULL, "growing nodeset\n"); + return(-1); + } + memset(cur->nodeTab, 0 , + XML_NODESET_DEFAULT * (size_t) sizeof(xmlNodePtr)); + cur->nodeMax = XML_NODESET_DEFAULT; + } else if (cur->nodeNr == cur->nodeMax) { + xmlNodePtr *temp; + + if (cur->nodeMax >= XPATH_MAX_NODESET_LENGTH) { + xmlXPathErrMemory(NULL, "growing nodeset hit limit\n"); + return(-1); + } + temp = (xmlNodePtr *) xmlRealloc(cur->nodeTab, cur->nodeMax * 2 * + sizeof(xmlNodePtr)); + if (temp == NULL) { + xmlXPathErrMemory(NULL, "growing nodeset\n"); + return(-1); + } + cur->nodeTab = temp; + cur->nodeMax *= 2; + } + if (val->type == XML_NAMESPACE_DECL) { + xmlNsPtr ns = (xmlNsPtr) val; + + cur->nodeTab[cur->nodeNr++] = + xmlXPathNodeSetDupNs((xmlNodePtr) ns->next, ns); + } else + cur->nodeTab[cur->nodeNr++] = val; + return(0); +} + +/** + * xmlXPathNodeSetMerge: + * @val1: the first NodeSet or NULL + * @val2: the second NodeSet + * + * Merges two nodesets, all nodes from @val2 are added to @val1 + * if @val1 is NULL, a new set is created and copied from @val2 + * + * Returns @val1 once extended or NULL in case of error. + */ +xmlNodeSetPtr +xmlXPathNodeSetMerge(xmlNodeSetPtr val1, xmlNodeSetPtr val2) { + int i, j, initNr, skip; + xmlNodePtr n1, n2; + + if (val2 == NULL) return(val1); + if (val1 == NULL) { + val1 = xmlXPathNodeSetCreate(NULL); + if (val1 == NULL) + return (NULL); +#if 0 + /* + * TODO: The optimization won't work in every case, since + * those nasty namespace nodes need to be added with + * xmlXPathNodeSetDupNs() to the set; thus a pure + * memcpy is not possible. + * If there was a flag on the nodesetval, indicating that + * some temporary nodes are in, that would be helpfull. + */ + /* + * Optimization: Create an equally sized node-set + * and memcpy the content. + */ + val1 = xmlXPathNodeSetCreateSize(val2->nodeNr); + if (val1 == NULL) + return(NULL); + if (val2->nodeNr != 0) { + if (val2->nodeNr == 1) + *(val1->nodeTab) = *(val2->nodeTab); + else { + memcpy(val1->nodeTab, val2->nodeTab, + val2->nodeNr * sizeof(xmlNodePtr)); + } + val1->nodeNr = val2->nodeNr; + } + return(val1); +#endif + } + + /* @@ with_ns to check whether namespace nodes should be looked at @@ */ + initNr = val1->nodeNr; + + for (i = 0;i < val2->nodeNr;i++) { + n2 = val2->nodeTab[i]; + /* + * check against duplicates + */ + skip = 0; + for (j = 0; j < initNr; j++) { + n1 = val1->nodeTab[j]; + if (n1 == n2) { + skip = 1; + break; + } else if ((n1->type == XML_NAMESPACE_DECL) && + (n2->type == XML_NAMESPACE_DECL)) { + if ((((xmlNsPtr) n1)->next == ((xmlNsPtr) n2)->next) && + (xmlStrEqual(((xmlNsPtr) n1)->prefix, + ((xmlNsPtr) n2)->prefix))) + { + skip = 1; + break; + } + } + } + if (skip) + continue; + + /* + * grow the nodeTab if needed + */ + if (val1->nodeMax == 0) { + val1->nodeTab = (xmlNodePtr *) xmlMalloc(XML_NODESET_DEFAULT * + sizeof(xmlNodePtr)); + if (val1->nodeTab == NULL) { + xmlXPathErrMemory(NULL, "merging nodeset\n"); + return(NULL); + } + memset(val1->nodeTab, 0 , + XML_NODESET_DEFAULT * (size_t) sizeof(xmlNodePtr)); + val1->nodeMax = XML_NODESET_DEFAULT; + } else if (val1->nodeNr == val1->nodeMax) { + xmlNodePtr *temp; + + if (val1->nodeMax >= XPATH_MAX_NODESET_LENGTH) { + xmlXPathErrMemory(NULL, "merging nodeset hit limit\n"); + return(NULL); + } + temp = (xmlNodePtr *) xmlRealloc(val1->nodeTab, val1->nodeMax * 2 * + sizeof(xmlNodePtr)); + if (temp == NULL) { + xmlXPathErrMemory(NULL, "merging nodeset\n"); + return(NULL); + } + val1->nodeTab = temp; + val1->nodeMax *= 2; + } + if (n2->type == XML_NAMESPACE_DECL) { + xmlNsPtr ns = (xmlNsPtr) n2; + + val1->nodeTab[val1->nodeNr++] = + xmlXPathNodeSetDupNs((xmlNodePtr) ns->next, ns); + } else + val1->nodeTab[val1->nodeNr++] = n2; + } + + return(val1); +} + + +/** + * xmlXPathNodeSetMergeAndClear: + * @set1: the first NodeSet or NULL + * @set2: the second NodeSet + * @hasSet2NsNodes: 1 if set2 contains namespaces nodes + * + * Merges two nodesets, all nodes from @set2 are added to @set1 + * if @set1 is NULL, a new set is created and copied from @set2. + * Checks for duplicate nodes. Clears set2. + * + * Returns @set1 once extended or NULL in case of error. + */ +static xmlNodeSetPtr +xmlXPathNodeSetMergeAndClear(xmlNodeSetPtr set1, xmlNodeSetPtr set2, + int hasNullEntries) +{ + if ((set1 == NULL) && (hasNullEntries == 0)) { + /* + * Note that doing a memcpy of the list, namespace nodes are + * just assigned to set1, since set2 is cleared anyway. + */ + set1 = xmlXPathNodeSetCreateSize(set2->nodeNr); + if (set1 == NULL) + return(NULL); + if (set2->nodeNr != 0) { + memcpy(set1->nodeTab, set2->nodeTab, + set2->nodeNr * sizeof(xmlNodePtr)); + set1->nodeNr = set2->nodeNr; + } + } else { + int i, j, initNbSet1; + xmlNodePtr n1, n2; + + if (set1 == NULL) + set1 = xmlXPathNodeSetCreate(NULL); + if (set1 == NULL) + return (NULL); + + initNbSet1 = set1->nodeNr; + for (i = 0;i < set2->nodeNr;i++) { + n2 = set2->nodeTab[i]; + /* + * Skip NULLed entries. + */ + if (n2 == NULL) + continue; + /* + * Skip duplicates. + */ + for (j = 0; j < initNbSet1; j++) { + n1 = set1->nodeTab[j]; + if (n1 == n2) { + goto skip_node; + } else if ((n1->type == XML_NAMESPACE_DECL) && + (n2->type == XML_NAMESPACE_DECL)) + { + if ((((xmlNsPtr) n1)->next == ((xmlNsPtr) n2)->next) && + (xmlStrEqual(((xmlNsPtr) n1)->prefix, + ((xmlNsPtr) n2)->prefix))) + { + /* + * Free the namespace node. + */ + set2->nodeTab[i] = NULL; + xmlXPathNodeSetFreeNs((xmlNsPtr) n2); + goto skip_node; + } + } + } + /* + * grow the nodeTab if needed + */ + if (set1->nodeMax == 0) { + set1->nodeTab = (xmlNodePtr *) xmlMalloc( + XML_NODESET_DEFAULT * sizeof(xmlNodePtr)); + if (set1->nodeTab == NULL) { + xmlXPathErrMemory(NULL, "merging nodeset\n"); + return(NULL); + } + memset(set1->nodeTab, 0, + XML_NODESET_DEFAULT * (size_t) sizeof(xmlNodePtr)); + set1->nodeMax = XML_NODESET_DEFAULT; + } else if (set1->nodeNr >= set1->nodeMax) { + xmlNodePtr *temp; + + if (set1->nodeMax >= XPATH_MAX_NODESET_LENGTH) { + xmlXPathErrMemory(NULL, "merging nodeset hit limit\n"); + return(NULL); + } + temp = (xmlNodePtr *) xmlRealloc( + set1->nodeTab, set1->nodeMax * 2 * sizeof(xmlNodePtr)); + if (temp == NULL) { + xmlXPathErrMemory(NULL, "merging nodeset\n"); + return(NULL); + } + set1->nodeTab = temp; + set1->nodeMax *= 2; + } + if (n2->type == XML_NAMESPACE_DECL) { + xmlNsPtr ns = (xmlNsPtr) n2; + + set1->nodeTab[set1->nodeNr++] = + xmlXPathNodeSetDupNs((xmlNodePtr) ns->next, ns); + } else + set1->nodeTab[set1->nodeNr++] = n2; +skip_node: + {} + } + } + set2->nodeNr = 0; + return(set1); +} + +/** + * xmlXPathNodeSetMergeAndClearNoDupls: + * @set1: the first NodeSet or NULL + * @set2: the second NodeSet + * @hasSet2NsNodes: 1 if set2 contains namespaces nodes + * + * Merges two nodesets, all nodes from @set2 are added to @set1 + * if @set1 is NULL, a new set is created and copied from @set2. + * Doesn't chack for duplicate nodes. Clears set2. + * + * Returns @set1 once extended or NULL in case of error. + */ +static xmlNodeSetPtr +xmlXPathNodeSetMergeAndClearNoDupls(xmlNodeSetPtr set1, xmlNodeSetPtr set2, + int hasNullEntries) +{ + if (set2 == NULL) + return(set1); + if ((set1 == NULL) && (hasNullEntries == 0)) { + /* + * Note that doing a memcpy of the list, namespace nodes are + * just assigned to set1, since set2 is cleared anyway. + */ + set1 = xmlXPathNodeSetCreateSize(set2->nodeNr); + if (set1 == NULL) + return(NULL); + if (set2->nodeNr != 0) { + memcpy(set1->nodeTab, set2->nodeTab, + set2->nodeNr * sizeof(xmlNodePtr)); + set1->nodeNr = set2->nodeNr; + } + } else { + int i; + xmlNodePtr n2; + + if (set1 == NULL) + set1 = xmlXPathNodeSetCreate(NULL); + if (set1 == NULL) + return (NULL); + + for (i = 0;i < set2->nodeNr;i++) { + n2 = set2->nodeTab[i]; + /* + * Skip NULLed entries. + */ + if (n2 == NULL) + continue; + if (set1->nodeMax == 0) { + set1->nodeTab = (xmlNodePtr *) xmlMalloc( + XML_NODESET_DEFAULT * sizeof(xmlNodePtr)); + if (set1->nodeTab == NULL) { + xmlXPathErrMemory(NULL, "merging nodeset\n"); + return(NULL); + } + memset(set1->nodeTab, 0, + XML_NODESET_DEFAULT * (size_t) sizeof(xmlNodePtr)); + set1->nodeMax = XML_NODESET_DEFAULT; + } else if (set1->nodeNr >= set1->nodeMax) { + xmlNodePtr *temp; + + if (set1->nodeMax >= XPATH_MAX_NODESET_LENGTH) { + xmlXPathErrMemory(NULL, "merging nodeset hit limit\n"); + return(NULL); + } + temp = (xmlNodePtr *) xmlRealloc( + set1->nodeTab, set1->nodeMax * 2 * sizeof(xmlNodePtr)); + if (temp == NULL) { + xmlXPathErrMemory(NULL, "merging nodeset\n"); + return(NULL); + } + set1->nodeTab = temp; + set1->nodeMax *= 2; + } + set1->nodeTab[set1->nodeNr++] = n2; + } + } + set2->nodeNr = 0; + return(set1); +} + +/** + * xmlXPathNodeSetDel: + * @cur: the initial node set + * @val: an xmlNodePtr + * + * Removes an xmlNodePtr from an existing NodeSet + */ +void +xmlXPathNodeSetDel(xmlNodeSetPtr cur, xmlNodePtr val) { + int i; + + if (cur == NULL) return; + if (val == NULL) return; + + /* + * find node in nodeTab + */ + for (i = 0;i < cur->nodeNr;i++) + if (cur->nodeTab[i] == val) break; + + if (i >= cur->nodeNr) { /* not found */ +#ifdef DEBUG + xmlGenericError(xmlGenericErrorContext, + "xmlXPathNodeSetDel: Node %s wasn't found in NodeList\n", + val->name); +#endif + return; + } + if ((cur->nodeTab[i] != NULL) && + (cur->nodeTab[i]->type == XML_NAMESPACE_DECL)) + xmlXPathNodeSetFreeNs((xmlNsPtr) cur->nodeTab[i]); + cur->nodeNr--; + for (;i < cur->nodeNr;i++) + cur->nodeTab[i] = cur->nodeTab[i + 1]; + cur->nodeTab[cur->nodeNr] = NULL; +} + +/** + * xmlXPathNodeSetRemove: + * @cur: the initial node set + * @val: the index to remove + * + * Removes an entry from an existing NodeSet list. + */ +void +xmlXPathNodeSetRemove(xmlNodeSetPtr cur, int val) { + if (cur == NULL) return; + if (val >= cur->nodeNr) return; + if ((cur->nodeTab[val] != NULL) && + (cur->nodeTab[val]->type == XML_NAMESPACE_DECL)) + xmlXPathNodeSetFreeNs((xmlNsPtr) cur->nodeTab[val]); + cur->nodeNr--; + for (;val < cur->nodeNr;val++) + cur->nodeTab[val] = cur->nodeTab[val + 1]; + cur->nodeTab[cur->nodeNr] = NULL; +} + +/** + * xmlXPathFreeNodeSet: + * @obj: the xmlNodeSetPtr to free + * + * Free the NodeSet compound (not the actual nodes !). + */ +void +xmlXPathFreeNodeSet(xmlNodeSetPtr obj) { + if (obj == NULL) return; + if (obj->nodeTab != NULL) { + int i; + + /* @@ with_ns to check whether namespace nodes should be looked at @@ */ + for (i = 0;i < obj->nodeNr;i++) + if ((obj->nodeTab[i] != NULL) && + (obj->nodeTab[i]->type == XML_NAMESPACE_DECL)) + xmlXPathNodeSetFreeNs((xmlNsPtr) obj->nodeTab[i]); + xmlFree(obj->nodeTab); + } + xmlFree(obj); +} + +/** + * xmlXPathNodeSetClear: + * @set: the node set to clear + * + * Clears the list from all temporary XPath objects (e.g. namespace nodes + * are feed), but does *not* free the list itself. Sets the length of the + * list to 0. + */ +static void +xmlXPathNodeSetClear(xmlNodeSetPtr set, int hasNsNodes) +{ + if ((set == NULL) || (set->nodeNr <= 0)) + return; + else if (hasNsNodes) { + int i; + xmlNodePtr node; + + for (i = 0; i < set->nodeNr; i++) { + node = set->nodeTab[i]; + if ((node != NULL) && + (node->type == XML_NAMESPACE_DECL)) + xmlXPathNodeSetFreeNs((xmlNsPtr) node); + } + } + set->nodeNr = 0; +} + +/** + * xmlXPathNodeSetClearFromPos: + * @set: the node set to be cleared + * @pos: the start position to clear from + * + * Clears the list from temporary XPath objects (e.g. namespace nodes + * are feed) starting with the entry at @pos, but does *not* free the list + * itself. Sets the length of the list to @pos. + */ +static void +xmlXPathNodeSetClearFromPos(xmlNodeSetPtr set, int pos, int hasNsNodes) +{ + if ((set == NULL) || (set->nodeNr <= 0) || (pos >= set->nodeNr)) + return; + else if ((hasNsNodes)) { + int i; + xmlNodePtr node; + + for (i = pos; i < set->nodeNr; i++) { + node = set->nodeTab[i]; + if ((node != NULL) && + (node->type == XML_NAMESPACE_DECL)) + xmlXPathNodeSetFreeNs((xmlNsPtr) node); + } + } + set->nodeNr = pos; +} + +/** + * xmlXPathFreeValueTree: + * @obj: the xmlNodeSetPtr to free + * + * Free the NodeSet compound and the actual tree, this is different + * from xmlXPathFreeNodeSet() + */ +static void +xmlXPathFreeValueTree(xmlNodeSetPtr obj) { + int i; + + if (obj == NULL) return; + + if (obj->nodeTab != NULL) { + for (i = 0;i < obj->nodeNr;i++) { + if (obj->nodeTab[i] != NULL) { + if (obj->nodeTab[i]->type == XML_NAMESPACE_DECL) { + xmlXPathNodeSetFreeNs((xmlNsPtr) obj->nodeTab[i]); + } else { + xmlFreeNodeList(obj->nodeTab[i]); + } + } + } + xmlFree(obj->nodeTab); + } + xmlFree(obj); +} + +#if defined(DEBUG) || defined(DEBUG_STEP) +/** + * xmlGenericErrorContextNodeSet: + * @output: a FILE * for the output + * @obj: the xmlNodeSetPtr to display + * + * Quick display of a NodeSet + */ +void +xmlGenericErrorContextNodeSet(FILE *output, xmlNodeSetPtr obj) { + int i; + + if (output == NULL) output = xmlGenericErrorContext; + if (obj == NULL) { + fprintf(output, "NodeSet == NULL !\n"); + return; + } + if (obj->nodeNr == 0) { + fprintf(output, "NodeSet is empty\n"); + return; + } + if (obj->nodeTab == NULL) { + fprintf(output, " nodeTab == NULL !\n"); + return; + } + for (i = 0; i < obj->nodeNr; i++) { + if (obj->nodeTab[i] == NULL) { + fprintf(output, " NULL !\n"); + return; + } + if ((obj->nodeTab[i]->type == XML_DOCUMENT_NODE) || + (obj->nodeTab[i]->type == XML_HTML_DOCUMENT_NODE)) + fprintf(output, " /"); + else if (obj->nodeTab[i]->name == NULL) + fprintf(output, " noname!"); + else fprintf(output, " %s", obj->nodeTab[i]->name); + } + fprintf(output, "\n"); +} +#endif + +/** + * xmlXPathNewNodeSet: + * @val: the NodePtr value + * + * Create a new xmlXPathObjectPtr of type NodeSet and initialize + * it with the single Node @val + * + * Returns the newly created object. + */ +xmlXPathObjectPtr +xmlXPathNewNodeSet(xmlNodePtr val) { + xmlXPathObjectPtr ret; + + ret = (xmlXPathObjectPtr) xmlMalloc(sizeof(xmlXPathObject)); + if (ret == NULL) { + xmlXPathErrMemory(NULL, "creating nodeset\n"); + return(NULL); + } + memset(ret, 0 , (size_t) sizeof(xmlXPathObject)); + ret->type = XPATH_NODESET; + ret->boolval = 0; + ret->nodesetval = xmlXPathNodeSetCreate(val); + /* @@ with_ns to check whether namespace nodes should be looked at @@ */ +#ifdef XP_DEBUG_OBJ_USAGE + xmlXPathDebugObjUsageRequested(NULL, XPATH_NODESET); +#endif + return(ret); +} + +/** + * xmlXPathNewValueTree: + * @val: the NodePtr value + * + * Create a new xmlXPathObjectPtr of type Value Tree (XSLT) and initialize + * it with the tree root @val + * + * Returns the newly created object. + */ +xmlXPathObjectPtr +xmlXPathNewValueTree(xmlNodePtr val) { + xmlXPathObjectPtr ret; + + ret = (xmlXPathObjectPtr) xmlMalloc(sizeof(xmlXPathObject)); + if (ret == NULL) { + xmlXPathErrMemory(NULL, "creating result value tree\n"); + return(NULL); + } + memset(ret, 0 , (size_t) sizeof(xmlXPathObject)); + ret->type = XPATH_XSLT_TREE; + ret->boolval = 1; + ret->user = (void *) val; + ret->nodesetval = xmlXPathNodeSetCreate(val); +#ifdef XP_DEBUG_OBJ_USAGE + xmlXPathDebugObjUsageRequested(NULL, XPATH_XSLT_TREE); +#endif + return(ret); +} + +/** + * xmlXPathNewNodeSetList: + * @val: an existing NodeSet + * + * Create a new xmlXPathObjectPtr of type NodeSet and initialize + * it with the Nodeset @val + * + * Returns the newly created object. + */ +xmlXPathObjectPtr +xmlXPathNewNodeSetList(xmlNodeSetPtr val) +{ + xmlXPathObjectPtr ret; + int i; + + if (val == NULL) + ret = NULL; + else if (val->nodeTab == NULL) + ret = xmlXPathNewNodeSet(NULL); + else { + ret = xmlXPathNewNodeSet(val->nodeTab[0]); + if (ret) { + for (i = 1; i < val->nodeNr; ++i) { + if (xmlXPathNodeSetAddUnique(ret->nodesetval, val->nodeTab[i]) + < 0) break; + } + } + } + + return (ret); +} + +/** + * xmlXPathWrapNodeSet: + * @val: the NodePtr value + * + * Wrap the Nodeset @val in a new xmlXPathObjectPtr + * + * Returns the newly created object. + */ +xmlXPathObjectPtr +xmlXPathWrapNodeSet(xmlNodeSetPtr val) { + xmlXPathObjectPtr ret; + + ret = (xmlXPathObjectPtr) xmlMalloc(sizeof(xmlXPathObject)); + if (ret == NULL) { + xmlXPathErrMemory(NULL, "creating node set object\n"); + return(NULL); + } + memset(ret, 0 , (size_t) sizeof(xmlXPathObject)); + ret->type = XPATH_NODESET; + ret->nodesetval = val; +#ifdef XP_DEBUG_OBJ_USAGE + xmlXPathDebugObjUsageRequested(NULL, XPATH_NODESET); +#endif + return(ret); +} + +/** + * xmlXPathFreeNodeSetList: + * @obj: an existing NodeSetList object + * + * Free up the xmlXPathObjectPtr @obj but don't deallocate the objects in + * the list contrary to xmlXPathFreeObject(). + */ +void +xmlXPathFreeNodeSetList(xmlXPathObjectPtr obj) { + if (obj == NULL) return; +#ifdef XP_DEBUG_OBJ_USAGE + xmlXPathDebugObjUsageReleased(NULL, obj->type); +#endif + xmlFree(obj); +} + +/** + * xmlXPathDifference: + * @nodes1: a node-set + * @nodes2: a node-set + * + * Implements the EXSLT - Sets difference() function: + * node-set set:difference (node-set, node-set) + * + * Returns the difference between the two node sets, or nodes1 if + * nodes2 is empty + */ +xmlNodeSetPtr +xmlXPathDifference (xmlNodeSetPtr nodes1, xmlNodeSetPtr nodes2) { + xmlNodeSetPtr ret; + int i, l1; + xmlNodePtr cur; + + if (xmlXPathNodeSetIsEmpty(nodes2)) + return(nodes1); + + ret = xmlXPathNodeSetCreate(NULL); + if (xmlXPathNodeSetIsEmpty(nodes1)) + return(ret); + + l1 = xmlXPathNodeSetGetLength(nodes1); + + for (i = 0; i < l1; i++) { + cur = xmlXPathNodeSetItem(nodes1, i); + if (!xmlXPathNodeSetContains(nodes2, cur)) { + if (xmlXPathNodeSetAddUnique(ret, cur) < 0) + break; + } + } + return(ret); +} + +/** + * xmlXPathIntersection: + * @nodes1: a node-set + * @nodes2: a node-set + * + * Implements the EXSLT - Sets intersection() function: + * node-set set:intersection (node-set, node-set) + * + * Returns a node set comprising the nodes that are within both the + * node sets passed as arguments + */ +xmlNodeSetPtr +xmlXPathIntersection (xmlNodeSetPtr nodes1, xmlNodeSetPtr nodes2) { + xmlNodeSetPtr ret = xmlXPathNodeSetCreate(NULL); + int i, l1; + xmlNodePtr cur; + + if (ret == NULL) + return(ret); + if (xmlXPathNodeSetIsEmpty(nodes1)) + return(ret); + if (xmlXPathNodeSetIsEmpty(nodes2)) + return(ret); + + l1 = xmlXPathNodeSetGetLength(nodes1); + + for (i = 0; i < l1; i++) { + cur = xmlXPathNodeSetItem(nodes1, i); + if (xmlXPathNodeSetContains(nodes2, cur)) { + if (xmlXPathNodeSetAddUnique(ret, cur) < 0) + break; + } + } + return(ret); +} + +/** + * xmlXPathDistinctSorted: + * @nodes: a node-set, sorted by document order + * + * Implements the EXSLT - Sets distinct() function: + * node-set set:distinct (node-set) + * + * Returns a subset of the nodes contained in @nodes, or @nodes if + * it is empty + */ +xmlNodeSetPtr +xmlXPathDistinctSorted (xmlNodeSetPtr nodes) { + xmlNodeSetPtr ret; + xmlHashTablePtr hash; + int i, l; + xmlChar * strval; + xmlNodePtr cur; + + if (xmlXPathNodeSetIsEmpty(nodes)) + return(nodes); + + ret = xmlXPathNodeSetCreate(NULL); + if (ret == NULL) + return(ret); + l = xmlXPathNodeSetGetLength(nodes); + hash = xmlHashCreate (l); + for (i = 0; i < l; i++) { + cur = xmlXPathNodeSetItem(nodes, i); + strval = xmlXPathCastNodeToString(cur); + if (xmlHashLookup(hash, strval) == NULL) { + xmlHashAddEntry(hash, strval, strval); + if (xmlXPathNodeSetAddUnique(ret, cur) < 0) + break; + } else { + xmlFree(strval); + } + } + xmlHashFree(hash, (xmlHashDeallocator) xmlFree); + return(ret); +} + +/** + * xmlXPathDistinct: + * @nodes: a node-set + * + * Implements the EXSLT - Sets distinct() function: + * node-set set:distinct (node-set) + * @nodes is sorted by document order, then #exslSetsDistinctSorted + * is called with the sorted node-set + * + * Returns a subset of the nodes contained in @nodes, or @nodes if + * it is empty + */ +xmlNodeSetPtr +xmlXPathDistinct (xmlNodeSetPtr nodes) { + if (xmlXPathNodeSetIsEmpty(nodes)) + return(nodes); + + xmlXPathNodeSetSort(nodes); + return(xmlXPathDistinctSorted(nodes)); +} + +/** + * xmlXPathHasSameNodes: + * @nodes1: a node-set + * @nodes2: a node-set + * + * Implements the EXSLT - Sets has-same-nodes function: + * boolean set:has-same-node(node-set, node-set) + * + * Returns true (1) if @nodes1 shares any node with @nodes2, false (0) + * otherwise + */ +int +xmlXPathHasSameNodes (xmlNodeSetPtr nodes1, xmlNodeSetPtr nodes2) { + int i, l; + xmlNodePtr cur; + + if (xmlXPathNodeSetIsEmpty(nodes1) || + xmlXPathNodeSetIsEmpty(nodes2)) + return(0); + + l = xmlXPathNodeSetGetLength(nodes1); + for (i = 0; i < l; i++) { + cur = xmlXPathNodeSetItem(nodes1, i); + if (xmlXPathNodeSetContains(nodes2, cur)) + return(1); + } + return(0); +} + +/** + * xmlXPathNodeLeadingSorted: + * @nodes: a node-set, sorted by document order + * @node: a node + * + * Implements the EXSLT - Sets leading() function: + * node-set set:leading (node-set, node-set) + * + * Returns the nodes in @nodes that precede @node in document order, + * @nodes if @node is NULL or an empty node-set if @nodes + * doesn't contain @node + */ +xmlNodeSetPtr +xmlXPathNodeLeadingSorted (xmlNodeSetPtr nodes, xmlNodePtr node) { + int i, l; + xmlNodePtr cur; + xmlNodeSetPtr ret; + + if (node == NULL) + return(nodes); + + ret = xmlXPathNodeSetCreate(NULL); + if (ret == NULL) + return(ret); + if (xmlXPathNodeSetIsEmpty(nodes) || + (!xmlXPathNodeSetContains(nodes, node))) + return(ret); + + l = xmlXPathNodeSetGetLength(nodes); + for (i = 0; i < l; i++) { + cur = xmlXPathNodeSetItem(nodes, i); + if (cur == node) + break; + if (xmlXPathNodeSetAddUnique(ret, cur) < 0) + break; + } + return(ret); +} + +/** + * xmlXPathNodeLeading: + * @nodes: a node-set + * @node: a node + * + * Implements the EXSLT - Sets leading() function: + * node-set set:leading (node-set, node-set) + * @nodes is sorted by document order, then #exslSetsNodeLeadingSorted + * is called. + * + * Returns the nodes in @nodes that precede @node in document order, + * @nodes if @node is NULL or an empty node-set if @nodes + * doesn't contain @node + */ +xmlNodeSetPtr +xmlXPathNodeLeading (xmlNodeSetPtr nodes, xmlNodePtr node) { + xmlXPathNodeSetSort(nodes); + return(xmlXPathNodeLeadingSorted(nodes, node)); +} + +/** + * xmlXPathLeadingSorted: + * @nodes1: a node-set, sorted by document order + * @nodes2: a node-set, sorted by document order + * + * Implements the EXSLT - Sets leading() function: + * node-set set:leading (node-set, node-set) + * + * Returns the nodes in @nodes1 that precede the first node in @nodes2 + * in document order, @nodes1 if @nodes2 is NULL or empty or + * an empty node-set if @nodes1 doesn't contain @nodes2 + */ +xmlNodeSetPtr +xmlXPathLeadingSorted (xmlNodeSetPtr nodes1, xmlNodeSetPtr nodes2) { + if (xmlXPathNodeSetIsEmpty(nodes2)) + return(nodes1); + return(xmlXPathNodeLeadingSorted(nodes1, + xmlXPathNodeSetItem(nodes2, 1))); +} + +/** + * xmlXPathLeading: + * @nodes1: a node-set + * @nodes2: a node-set + * + * Implements the EXSLT - Sets leading() function: + * node-set set:leading (node-set, node-set) + * @nodes1 and @nodes2 are sorted by document order, then + * #exslSetsLeadingSorted is called. + * + * Returns the nodes in @nodes1 that precede the first node in @nodes2 + * in document order, @nodes1 if @nodes2 is NULL or empty or + * an empty node-set if @nodes1 doesn't contain @nodes2 + */ +xmlNodeSetPtr +xmlXPathLeading (xmlNodeSetPtr nodes1, xmlNodeSetPtr nodes2) { + if (xmlXPathNodeSetIsEmpty(nodes2)) + return(nodes1); + if (xmlXPathNodeSetIsEmpty(nodes1)) + return(xmlXPathNodeSetCreate(NULL)); + xmlXPathNodeSetSort(nodes1); + xmlXPathNodeSetSort(nodes2); + return(xmlXPathNodeLeadingSorted(nodes1, + xmlXPathNodeSetItem(nodes2, 1))); +} + +/** + * xmlXPathNodeTrailingSorted: + * @nodes: a node-set, sorted by document order + * @node: a node + * + * Implements the EXSLT - Sets trailing() function: + * node-set set:trailing (node-set, node-set) + * + * Returns the nodes in @nodes that follow @node in document order, + * @nodes if @node is NULL or an empty node-set if @nodes + * doesn't contain @node + */ +xmlNodeSetPtr +xmlXPathNodeTrailingSorted (xmlNodeSetPtr nodes, xmlNodePtr node) { + int i, l; + xmlNodePtr cur; + xmlNodeSetPtr ret; + + if (node == NULL) + return(nodes); + + ret = xmlXPathNodeSetCreate(NULL); + if (ret == NULL) + return(ret); + if (xmlXPathNodeSetIsEmpty(nodes) || + (!xmlXPathNodeSetContains(nodes, node))) + return(ret); + + l = xmlXPathNodeSetGetLength(nodes); + for (i = l - 1; i >= 0; i--) { + cur = xmlXPathNodeSetItem(nodes, i); + if (cur == node) + break; + if (xmlXPathNodeSetAddUnique(ret, cur) < 0) + break; + } + xmlXPathNodeSetSort(ret); /* bug 413451 */ + return(ret); +} + +/** + * xmlXPathNodeTrailing: + * @nodes: a node-set + * @node: a node + * + * Implements the EXSLT - Sets trailing() function: + * node-set set:trailing (node-set, node-set) + * @nodes is sorted by document order, then #xmlXPathNodeTrailingSorted + * is called. + * + * Returns the nodes in @nodes that follow @node in document order, + * @nodes if @node is NULL or an empty node-set if @nodes + * doesn't contain @node + */ +xmlNodeSetPtr +xmlXPathNodeTrailing (xmlNodeSetPtr nodes, xmlNodePtr node) { + xmlXPathNodeSetSort(nodes); + return(xmlXPathNodeTrailingSorted(nodes, node)); +} + +/** + * xmlXPathTrailingSorted: + * @nodes1: a node-set, sorted by document order + * @nodes2: a node-set, sorted by document order + * + * Implements the EXSLT - Sets trailing() function: + * node-set set:trailing (node-set, node-set) + * + * Returns the nodes in @nodes1 that follow the first node in @nodes2 + * in document order, @nodes1 if @nodes2 is NULL or empty or + * an empty node-set if @nodes1 doesn't contain @nodes2 + */ +xmlNodeSetPtr +xmlXPathTrailingSorted (xmlNodeSetPtr nodes1, xmlNodeSetPtr nodes2) { + if (xmlXPathNodeSetIsEmpty(nodes2)) + return(nodes1); + return(xmlXPathNodeTrailingSorted(nodes1, + xmlXPathNodeSetItem(nodes2, 0))); +} + +/** + * xmlXPathTrailing: + * @nodes1: a node-set + * @nodes2: a node-set + * + * Implements the EXSLT - Sets trailing() function: + * node-set set:trailing (node-set, node-set) + * @nodes1 and @nodes2 are sorted by document order, then + * #xmlXPathTrailingSorted is called. + * + * Returns the nodes in @nodes1 that follow the first node in @nodes2 + * in document order, @nodes1 if @nodes2 is NULL or empty or + * an empty node-set if @nodes1 doesn't contain @nodes2 + */ +xmlNodeSetPtr +xmlXPathTrailing (xmlNodeSetPtr nodes1, xmlNodeSetPtr nodes2) { + if (xmlXPathNodeSetIsEmpty(nodes2)) + return(nodes1); + if (xmlXPathNodeSetIsEmpty(nodes1)) + return(xmlXPathNodeSetCreate(NULL)); + xmlXPathNodeSetSort(nodes1); + xmlXPathNodeSetSort(nodes2); + return(xmlXPathNodeTrailingSorted(nodes1, + xmlXPathNodeSetItem(nodes2, 0))); +} + +/************************************************************************ + * * + * Routines to handle extra functions * + * * + ************************************************************************/ + +/** + * xmlXPathRegisterFunc: + * @ctxt: the XPath context + * @name: the function name + * @f: the function implementation or NULL + * + * Register a new function. If @f is NULL it unregisters the function + * + * Returns 0 in case of success, -1 in case of error + */ +int +xmlXPathRegisterFunc(xmlXPathContextPtr ctxt, const xmlChar *name, + xmlXPathFunction f) { + return(xmlXPathRegisterFuncNS(ctxt, name, NULL, f)); +} + +/** + * xmlXPathRegisterFuncNS: + * @ctxt: the XPath context + * @name: the function name + * @ns_uri: the function namespace URI + * @f: the function implementation or NULL + * + * Register a new function. If @f is NULL it unregisters the function + * + * Returns 0 in case of success, -1 in case of error + */ +int +xmlXPathRegisterFuncNS(xmlXPathContextPtr ctxt, const xmlChar *name, + const xmlChar *ns_uri, xmlXPathFunction f) { + if (ctxt == NULL) + return(-1); + if (name == NULL) + return(-1); + + if (ctxt->funcHash == NULL) + ctxt->funcHash = xmlHashCreate(0); + if (ctxt->funcHash == NULL) + return(-1); + if (f == NULL) + return(xmlHashRemoveEntry2(ctxt->funcHash, name, ns_uri, NULL)); + return(xmlHashAddEntry2(ctxt->funcHash, name, ns_uri, XML_CAST_FPTR(f))); +} + +/** + * xmlXPathRegisterFuncLookup: + * @ctxt: the XPath context + * @f: the lookup function + * @funcCtxt: the lookup data + * + * Registers an external mechanism to do function lookup. + */ +void +xmlXPathRegisterFuncLookup (xmlXPathContextPtr ctxt, + xmlXPathFuncLookupFunc f, + void *funcCtxt) { + if (ctxt == NULL) + return; + ctxt->funcLookupFunc = f; + ctxt->funcLookupData = funcCtxt; +} + +/** + * xmlXPathFunctionLookup: + * @ctxt: the XPath context + * @name: the function name + * + * Search in the Function array of the context for the given + * function. + * + * Returns the xmlXPathFunction or NULL if not found + */ +xmlXPathFunction +xmlXPathFunctionLookup(xmlXPathContextPtr ctxt, const xmlChar *name) { + if (ctxt == NULL) + return (NULL); + + if (ctxt->funcLookupFunc != NULL) { + xmlXPathFunction ret; + xmlXPathFuncLookupFunc f; + + f = ctxt->funcLookupFunc; + ret = f(ctxt->funcLookupData, name, NULL); + if (ret != NULL) + return(ret); + } + return(xmlXPathFunctionLookupNS(ctxt, name, NULL)); +} + +/** + * xmlXPathFunctionLookupNS: + * @ctxt: the XPath context + * @name: the function name + * @ns_uri: the function namespace URI + * + * Search in the Function array of the context for the given + * function. + * + * Returns the xmlXPathFunction or NULL if not found + */ +xmlXPathFunction +xmlXPathFunctionLookupNS(xmlXPathContextPtr ctxt, const xmlChar *name, + const xmlChar *ns_uri) { + xmlXPathFunction ret; + + if (ctxt == NULL) + return(NULL); + if (name == NULL) + return(NULL); + + if (ctxt->funcLookupFunc != NULL) { + xmlXPathFuncLookupFunc f; + + f = ctxt->funcLookupFunc; + ret = f(ctxt->funcLookupData, name, ns_uri); + if (ret != NULL) + return(ret); + } + + if (ctxt->funcHash == NULL) + return(NULL); + + XML_CAST_FPTR(ret) = xmlHashLookup2(ctxt->funcHash, name, ns_uri); + return(ret); +} + +/** + * xmlXPathRegisteredFuncsCleanup: + * @ctxt: the XPath context + * + * Cleanup the XPath context data associated to registered functions + */ +void +xmlXPathRegisteredFuncsCleanup(xmlXPathContextPtr ctxt) { + if (ctxt == NULL) + return; + + xmlHashFree(ctxt->funcHash, NULL); + ctxt->funcHash = NULL; +} + +/************************************************************************ + * * + * Routines to handle Variables * + * * + ************************************************************************/ + +/** + * xmlXPathRegisterVariable: + * @ctxt: the XPath context + * @name: the variable name + * @value: the variable value or NULL + * + * Register a new variable value. If @value is NULL it unregisters + * the variable + * + * Returns 0 in case of success, -1 in case of error + */ +int +xmlXPathRegisterVariable(xmlXPathContextPtr ctxt, const xmlChar *name, + xmlXPathObjectPtr value) { + return(xmlXPathRegisterVariableNS(ctxt, name, NULL, value)); +} + +/** + * xmlXPathRegisterVariableNS: + * @ctxt: the XPath context + * @name: the variable name + * @ns_uri: the variable namespace URI + * @value: the variable value or NULL + * + * Register a new variable value. If @value is NULL it unregisters + * the variable + * + * Returns 0 in case of success, -1 in case of error + */ +int +xmlXPathRegisterVariableNS(xmlXPathContextPtr ctxt, const xmlChar *name, + const xmlChar *ns_uri, + xmlXPathObjectPtr value) { + if (ctxt == NULL) + return(-1); + if (name == NULL) + return(-1); + + if (ctxt->varHash == NULL) + ctxt->varHash = xmlHashCreate(0); + if (ctxt->varHash == NULL) + return(-1); + if (value == NULL) + return(xmlHashRemoveEntry2(ctxt->varHash, name, ns_uri, + (xmlHashDeallocator)xmlXPathFreeObject)); + return(xmlHashUpdateEntry2(ctxt->varHash, name, ns_uri, + (void *) value, + (xmlHashDeallocator)xmlXPathFreeObject)); +} + +/** + * xmlXPathRegisterVariableLookup: + * @ctxt: the XPath context + * @f: the lookup function + * @data: the lookup data + * + * register an external mechanism to do variable lookup + */ +void +xmlXPathRegisterVariableLookup(xmlXPathContextPtr ctxt, + xmlXPathVariableLookupFunc f, void *data) { + if (ctxt == NULL) + return; + ctxt->varLookupFunc = f; + ctxt->varLookupData = data; +} + +/** + * xmlXPathVariableLookup: + * @ctxt: the XPath context + * @name: the variable name + * + * Search in the Variable array of the context for the given + * variable value. + * + * Returns a copy of the value or NULL if not found + */ +xmlXPathObjectPtr +xmlXPathVariableLookup(xmlXPathContextPtr ctxt, const xmlChar *name) { + if (ctxt == NULL) + return(NULL); + + if (ctxt->varLookupFunc != NULL) { + xmlXPathObjectPtr ret; + + ret = ((xmlXPathVariableLookupFunc)ctxt->varLookupFunc) + (ctxt->varLookupData, name, NULL); + return(ret); + } + return(xmlXPathVariableLookupNS(ctxt, name, NULL)); +} + +/** + * xmlXPathVariableLookupNS: + * @ctxt: the XPath context + * @name: the variable name + * @ns_uri: the variable namespace URI + * + * Search in the Variable array of the context for the given + * variable value. + * + * Returns the a copy of the value or NULL if not found + */ +xmlXPathObjectPtr +xmlXPathVariableLookupNS(xmlXPathContextPtr ctxt, const xmlChar *name, + const xmlChar *ns_uri) { + if (ctxt == NULL) + return(NULL); + + if (ctxt->varLookupFunc != NULL) { + xmlXPathObjectPtr ret; + + ret = ((xmlXPathVariableLookupFunc)ctxt->varLookupFunc) + (ctxt->varLookupData, name, ns_uri); + if (ret != NULL) return(ret); + } + + if (ctxt->varHash == NULL) + return(NULL); + if (name == NULL) + return(NULL); + + return(xmlXPathCacheObjectCopy(ctxt, (xmlXPathObjectPtr) + xmlHashLookup2(ctxt->varHash, name, ns_uri))); +} + +/** + * xmlXPathRegisteredVariablesCleanup: + * @ctxt: the XPath context + * + * Cleanup the XPath context data associated to registered variables + */ +void +xmlXPathRegisteredVariablesCleanup(xmlXPathContextPtr ctxt) { + if (ctxt == NULL) + return; + + xmlHashFree(ctxt->varHash, (xmlHashDeallocator)xmlXPathFreeObject); + ctxt->varHash = NULL; +} + +/** + * xmlXPathRegisterNs: + * @ctxt: the XPath context + * @prefix: the namespace prefix cannot be NULL or empty string + * @ns_uri: the namespace name + * + * Register a new namespace. If @ns_uri is NULL it unregisters + * the namespace + * + * Returns 0 in case of success, -1 in case of error + */ +int +xmlXPathRegisterNs(xmlXPathContextPtr ctxt, const xmlChar *prefix, + const xmlChar *ns_uri) { + if (ctxt == NULL) + return(-1); + if (prefix == NULL) + return(-1); + if (prefix[0] == 0) + return(-1); + + if (ctxt->nsHash == NULL) + ctxt->nsHash = xmlHashCreate(10); + if (ctxt->nsHash == NULL) + return(-1); + if (ns_uri == NULL) + return(xmlHashRemoveEntry(ctxt->nsHash, prefix, + (xmlHashDeallocator)xmlFree)); + return(xmlHashUpdateEntry(ctxt->nsHash, prefix, (void *) xmlStrdup(ns_uri), + (xmlHashDeallocator)xmlFree)); +} + +/** + * xmlXPathNsLookup: + * @ctxt: the XPath context + * @prefix: the namespace prefix value + * + * Search in the namespace declaration array of the context for the given + * namespace name associated to the given prefix + * + * Returns the value or NULL if not found + */ +const xmlChar * +xmlXPathNsLookup(xmlXPathContextPtr ctxt, const xmlChar *prefix) { + if (ctxt == NULL) + return(NULL); + if (prefix == NULL) + return(NULL); + +#ifdef XML_XML_NAMESPACE + if (xmlStrEqual(prefix, (const xmlChar *) "xml")) + return(XML_XML_NAMESPACE); +#endif + + if (ctxt->namespaces != NULL) { + int i; + + for (i = 0;i < ctxt->nsNr;i++) { + if ((ctxt->namespaces[i] != NULL) && + (xmlStrEqual(ctxt->namespaces[i]->prefix, prefix))) + return(ctxt->namespaces[i]->href); + } + } + + return((const xmlChar *) xmlHashLookup(ctxt->nsHash, prefix)); +} + +/** + * xmlXPathRegisteredNsCleanup: + * @ctxt: the XPath context + * + * Cleanup the XPath context data associated to registered variables + */ +void +xmlXPathRegisteredNsCleanup(xmlXPathContextPtr ctxt) { + if (ctxt == NULL) + return; + + xmlHashFree(ctxt->nsHash, (xmlHashDeallocator)xmlFree); + ctxt->nsHash = NULL; +} + +/************************************************************************ + * * + * Routines to handle Values * + * * + ************************************************************************/ + +/* Allocations are terrible, one needs to optimize all this !!! */ + +/** + * xmlXPathNewFloat: + * @val: the double value + * + * Create a new xmlXPathObjectPtr of type double and of value @val + * + * Returns the newly created object. + */ +xmlXPathObjectPtr +xmlXPathNewFloat(double val) { + xmlXPathObjectPtr ret; + + ret = (xmlXPathObjectPtr) xmlMalloc(sizeof(xmlXPathObject)); + if (ret == NULL) { + xmlXPathErrMemory(NULL, "creating float object\n"); + return(NULL); + } + memset(ret, 0 , (size_t) sizeof(xmlXPathObject)); + ret->type = XPATH_NUMBER; + ret->floatval = val; +#ifdef XP_DEBUG_OBJ_USAGE + xmlXPathDebugObjUsageRequested(NULL, XPATH_NUMBER); +#endif + return(ret); +} + +/** + * xmlXPathNewBoolean: + * @val: the boolean value + * + * Create a new xmlXPathObjectPtr of type boolean and of value @val + * + * Returns the newly created object. + */ +xmlXPathObjectPtr +xmlXPathNewBoolean(int val) { + xmlXPathObjectPtr ret; + + ret = (xmlXPathObjectPtr) xmlMalloc(sizeof(xmlXPathObject)); + if (ret == NULL) { + xmlXPathErrMemory(NULL, "creating boolean object\n"); + return(NULL); + } + memset(ret, 0 , (size_t) sizeof(xmlXPathObject)); + ret->type = XPATH_BOOLEAN; + ret->boolval = (val != 0); +#ifdef XP_DEBUG_OBJ_USAGE + xmlXPathDebugObjUsageRequested(NULL, XPATH_BOOLEAN); +#endif + return(ret); +} + +/** + * xmlXPathNewString: + * @val: the xmlChar * value + * + * Create a new xmlXPathObjectPtr of type string and of value @val + * + * Returns the newly created object. + */ +xmlXPathObjectPtr +xmlXPathNewString(const xmlChar *val) { + xmlXPathObjectPtr ret; + + ret = (xmlXPathObjectPtr) xmlMalloc(sizeof(xmlXPathObject)); + if (ret == NULL) { + xmlXPathErrMemory(NULL, "creating string object\n"); + return(NULL); + } + memset(ret, 0 , (size_t) sizeof(xmlXPathObject)); + ret->type = XPATH_STRING; + if (val != NULL) + ret->stringval = xmlStrdup(val); + else + ret->stringval = xmlStrdup((const xmlChar *)""); +#ifdef XP_DEBUG_OBJ_USAGE + xmlXPathDebugObjUsageRequested(NULL, XPATH_STRING); +#endif + return(ret); +} + +/** + * xmlXPathWrapString: + * @val: the xmlChar * value + * + * Wraps the @val string into an XPath object. + * + * Returns the newly created object. + */ +xmlXPathObjectPtr +xmlXPathWrapString (xmlChar *val) { + xmlXPathObjectPtr ret; + + ret = (xmlXPathObjectPtr) xmlMalloc(sizeof(xmlXPathObject)); + if (ret == NULL) { + xmlXPathErrMemory(NULL, "creating string object\n"); + return(NULL); + } + memset(ret, 0 , (size_t) sizeof(xmlXPathObject)); + ret->type = XPATH_STRING; + ret->stringval = val; +#ifdef XP_DEBUG_OBJ_USAGE + xmlXPathDebugObjUsageRequested(NULL, XPATH_STRING); +#endif + return(ret); +} + +/** + * xmlXPathNewCString: + * @val: the char * value + * + * Create a new xmlXPathObjectPtr of type string and of value @val + * + * Returns the newly created object. + */ +xmlXPathObjectPtr +xmlXPathNewCString(const char *val) { + xmlXPathObjectPtr ret; + + ret = (xmlXPathObjectPtr) xmlMalloc(sizeof(xmlXPathObject)); + if (ret == NULL) { + xmlXPathErrMemory(NULL, "creating string object\n"); + return(NULL); + } + memset(ret, 0 , (size_t) sizeof(xmlXPathObject)); + ret->type = XPATH_STRING; + ret->stringval = xmlStrdup(BAD_CAST val); +#ifdef XP_DEBUG_OBJ_USAGE + xmlXPathDebugObjUsageRequested(NULL, XPATH_STRING); +#endif + return(ret); +} + +/** + * xmlXPathWrapCString: + * @val: the char * value + * + * Wraps a string into an XPath object. + * + * Returns the newly created object. + */ +xmlXPathObjectPtr +xmlXPathWrapCString (char * val) { + return(xmlXPathWrapString((xmlChar *)(val))); +} + +/** + * xmlXPathWrapExternal: + * @val: the user data + * + * Wraps the @val data into an XPath object. + * + * Returns the newly created object. + */ +xmlXPathObjectPtr +xmlXPathWrapExternal (void *val) { + xmlXPathObjectPtr ret; + + ret = (xmlXPathObjectPtr) xmlMalloc(sizeof(xmlXPathObject)); + if (ret == NULL) { + xmlXPathErrMemory(NULL, "creating user object\n"); + return(NULL); + } + memset(ret, 0 , (size_t) sizeof(xmlXPathObject)); + ret->type = XPATH_USERS; + ret->user = val; +#ifdef XP_DEBUG_OBJ_USAGE + xmlXPathDebugObjUsageRequested(NULL, XPATH_USERS); +#endif + return(ret); +} + +/** + * xmlXPathObjectCopy: + * @val: the original object + * + * allocate a new copy of a given object + * + * Returns the newly created object. + */ +xmlXPathObjectPtr +xmlXPathObjectCopy(xmlXPathObjectPtr val) { + xmlXPathObjectPtr ret; + + if (val == NULL) + return(NULL); + + ret = (xmlXPathObjectPtr) xmlMalloc(sizeof(xmlXPathObject)); + if (ret == NULL) { + xmlXPathErrMemory(NULL, "copying object\n"); + return(NULL); + } + memcpy(ret, val , (size_t) sizeof(xmlXPathObject)); +#ifdef XP_DEBUG_OBJ_USAGE + xmlXPathDebugObjUsageRequested(NULL, val->type); +#endif + switch (val->type) { + case XPATH_BOOLEAN: + case XPATH_NUMBER: + case XPATH_POINT: + case XPATH_RANGE: + break; + case XPATH_STRING: + ret->stringval = xmlStrdup(val->stringval); + break; + case XPATH_XSLT_TREE: +#if 0 +/* + Removed 11 July 2004 - the current handling of xslt tmpRVT nodes means that + this previous handling is no longer correct, and can cause some serious + problems (ref. bug 145547) +*/ + if ((val->nodesetval != NULL) && + (val->nodesetval->nodeTab != NULL)) { + xmlNodePtr cur, tmp; + xmlDocPtr top; + + ret->boolval = 1; + top = xmlNewDoc(NULL); + top->name = (char *) + xmlStrdup(val->nodesetval->nodeTab[0]->name); + ret->user = top; + if (top != NULL) { + top->doc = top; + cur = val->nodesetval->nodeTab[0]->children; + while (cur != NULL) { + tmp = xmlDocCopyNode(cur, top, 1); + xmlAddChild((xmlNodePtr) top, tmp); + cur = cur->next; + } + } + + ret->nodesetval = xmlXPathNodeSetCreate((xmlNodePtr) top); + } else + ret->nodesetval = xmlXPathNodeSetCreate(NULL); + /* Deallocate the copied tree value */ + break; +#endif + case XPATH_NODESET: + ret->nodesetval = xmlXPathNodeSetMerge(NULL, val->nodesetval); + /* Do not deallocate the copied tree value */ + ret->boolval = 0; + break; + case XPATH_LOCATIONSET: +#ifdef LIBXML_XPTR_ENABLED + { + xmlLocationSetPtr loc = val->user; + ret->user = (void *) xmlXPtrLocationSetMerge(NULL, loc); + break; + } +#endif + case XPATH_USERS: + ret->user = val->user; + break; + case XPATH_UNDEFINED: + xmlGenericError(xmlGenericErrorContext, + "xmlXPathObjectCopy: unsupported type %d\n", + val->type); + break; + } + return(ret); +} + +/** + * xmlXPathFreeObject: + * @obj: the object to free + * + * Free up an xmlXPathObjectPtr object. + */ +void +xmlXPathFreeObject(xmlXPathObjectPtr obj) { + if (obj == NULL) return; + if ((obj->type == XPATH_NODESET) || (obj->type == XPATH_XSLT_TREE)) { + if (obj->boolval) { +#if 0 + if (obj->user != NULL) { + xmlXPathFreeNodeSet(obj->nodesetval); + xmlFreeNodeList((xmlNodePtr) obj->user); + } else +#endif + obj->type = XPATH_XSLT_TREE; /* TODO: Just for debugging. */ + if (obj->nodesetval != NULL) + xmlXPathFreeValueTree(obj->nodesetval); + } else { + if (obj->nodesetval != NULL) + xmlXPathFreeNodeSet(obj->nodesetval); + } +#ifdef LIBXML_XPTR_ENABLED + } else if (obj->type == XPATH_LOCATIONSET) { + if (obj->user != NULL) + xmlXPtrFreeLocationSet(obj->user); +#endif + } else if (obj->type == XPATH_STRING) { + if (obj->stringval != NULL) + xmlFree(obj->stringval); + } +#ifdef XP_DEBUG_OBJ_USAGE + xmlXPathDebugObjUsageReleased(NULL, obj->type); +#endif + xmlFree(obj); +} + +/** + * xmlXPathReleaseObject: + * @obj: the xmlXPathObjectPtr to free or to cache + * + * Depending on the state of the cache this frees the given + * XPath object or stores it in the cache. + */ +static void +xmlXPathReleaseObject(xmlXPathContextPtr ctxt, xmlXPathObjectPtr obj) +{ +#define XP_CACHE_ADD(sl, o) if (sl == NULL) { \ + sl = xmlPointerListCreate(10); if (sl == NULL) goto free_obj; } \ + if (xmlPointerListAddSize(sl, obj, 0) == -1) goto free_obj; + +#define XP_CACHE_WANTS(sl, n) ((sl == NULL) || ((sl)->number < n)) + + if (obj == NULL) + return; + if ((ctxt == NULL) || (ctxt->cache == NULL)) { + xmlXPathFreeObject(obj); + } else { + xmlXPathContextCachePtr cache = + (xmlXPathContextCachePtr) ctxt->cache; + + switch (obj->type) { + case XPATH_NODESET: + case XPATH_XSLT_TREE: + if (obj->nodesetval != NULL) { + if (obj->boolval) { + /* + * It looks like the @boolval is used for + * evaluation if this an XSLT Result Tree Fragment. + * TODO: Check if this assumption is correct. + */ + obj->type = XPATH_XSLT_TREE; /* just for debugging */ + xmlXPathFreeValueTree(obj->nodesetval); + obj->nodesetval = NULL; + } else if ((obj->nodesetval->nodeMax <= 40) && + (XP_CACHE_WANTS(cache->nodesetObjs, + cache->maxNodeset))) + { + XP_CACHE_ADD(cache->nodesetObjs, obj); + goto obj_cached; + } else { + xmlXPathFreeNodeSet(obj->nodesetval); + obj->nodesetval = NULL; + } + } + break; + case XPATH_STRING: + if (obj->stringval != NULL) + xmlFree(obj->stringval); + + if (XP_CACHE_WANTS(cache->stringObjs, cache->maxString)) { + XP_CACHE_ADD(cache->stringObjs, obj); + goto obj_cached; + } + break; + case XPATH_BOOLEAN: + if (XP_CACHE_WANTS(cache->booleanObjs, cache->maxBoolean)) { + XP_CACHE_ADD(cache->booleanObjs, obj); + goto obj_cached; + } + break; + case XPATH_NUMBER: + if (XP_CACHE_WANTS(cache->numberObjs, cache->maxNumber)) { + XP_CACHE_ADD(cache->numberObjs, obj); + goto obj_cached; + } + break; +#ifdef LIBXML_XPTR_ENABLED + case XPATH_LOCATIONSET: + if (obj->user != NULL) { + xmlXPtrFreeLocationSet(obj->user); + } + goto free_obj; +#endif + default: + goto free_obj; + } + + /* + * Fallback to adding to the misc-objects slot. + */ + if (XP_CACHE_WANTS(cache->miscObjs, cache->maxMisc)) { + XP_CACHE_ADD(cache->miscObjs, obj); + } else + goto free_obj; + +obj_cached: + +#ifdef XP_DEBUG_OBJ_USAGE + xmlXPathDebugObjUsageReleased(ctxt, obj->type); +#endif + + if (obj->nodesetval != NULL) { + xmlNodeSetPtr tmpset = obj->nodesetval; + + /* + * TODO: Due to those nasty ns-nodes, we need to traverse + * the list and free the ns-nodes. + * URGENT TODO: Check if it's actually slowing things down. + * Maybe we shouldn't try to preserve the list. + */ + if (tmpset->nodeNr > 1) { + int i; + xmlNodePtr node; + + for (i = 0; i < tmpset->nodeNr; i++) { + node = tmpset->nodeTab[i]; + if ((node != NULL) && + (node->type == XML_NAMESPACE_DECL)) + { + xmlXPathNodeSetFreeNs((xmlNsPtr) node); + } + } + } else if (tmpset->nodeNr == 1) { + if ((tmpset->nodeTab[0] != NULL) && + (tmpset->nodeTab[0]->type == XML_NAMESPACE_DECL)) + xmlXPathNodeSetFreeNs((xmlNsPtr) tmpset->nodeTab[0]); + } + tmpset->nodeNr = 0; + memset(obj, 0, sizeof(xmlXPathObject)); + obj->nodesetval = tmpset; + } else + memset(obj, 0, sizeof(xmlXPathObject)); + + return; + +free_obj: + /* + * Cache is full; free the object. + */ + if (obj->nodesetval != NULL) + xmlXPathFreeNodeSet(obj->nodesetval); +#ifdef XP_DEBUG_OBJ_USAGE + xmlXPathDebugObjUsageReleased(NULL, obj->type); +#endif + xmlFree(obj); + } + return; +} + + +/************************************************************************ + * * + * Type Casting Routines * + * * + ************************************************************************/ + +/** + * xmlXPathCastBooleanToString: + * @val: a boolean + * + * Converts a boolean to its string value. + * + * Returns a newly allocated string. + */ +xmlChar * +xmlXPathCastBooleanToString (int val) { + xmlChar *ret; + if (val) + ret = xmlStrdup((const xmlChar *) "true"); + else + ret = xmlStrdup((const xmlChar *) "false"); + return(ret); +} + +/** + * xmlXPathCastNumberToString: + * @val: a number + * + * Converts a number to its string value. + * + * Returns a newly allocated string. + */ +xmlChar * +xmlXPathCastNumberToString (double val) { + xmlChar *ret; + switch (xmlXPathIsInf(val)) { + case 1: + ret = xmlStrdup((const xmlChar *) "Infinity"); + break; + case -1: + ret = xmlStrdup((const xmlChar *) "-Infinity"); + break; + default: + if (xmlXPathIsNaN(val)) { + ret = xmlStrdup((const xmlChar *) "NaN"); + } else if (val == 0 && xmlXPathGetSign(val) != 0) { + ret = xmlStrdup((const xmlChar *) "0"); + } else { + /* could be improved */ + char buf[100]; + xmlXPathFormatNumber(val, buf, 99); + buf[99] = 0; + ret = xmlStrdup((const xmlChar *) buf); + } + } + return(ret); +} + +/** + * xmlXPathCastNodeToString: + * @node: a node + * + * Converts a node to its string value. + * + * Returns a newly allocated string. + */ +xmlChar * +xmlXPathCastNodeToString (xmlNodePtr node) { +xmlChar *ret; + if ((ret = xmlNodeGetContent(node)) == NULL) + ret = xmlStrdup((const xmlChar *) ""); + return(ret); +} + +/** + * xmlXPathCastNodeSetToString: + * @ns: a node-set + * + * Converts a node-set to its string value. + * + * Returns a newly allocated string. + */ +xmlChar * +xmlXPathCastNodeSetToString (xmlNodeSetPtr ns) { + if ((ns == NULL) || (ns->nodeNr == 0) || (ns->nodeTab == NULL)) + return(xmlStrdup((const xmlChar *) "")); + + if (ns->nodeNr > 1) + xmlXPathNodeSetSort(ns); + return(xmlXPathCastNodeToString(ns->nodeTab[0])); +} + +/** + * xmlXPathCastToString: + * @val: an XPath object + * + * Converts an existing object to its string() equivalent + * + * Returns the allocated string value of the object, NULL in case of error. + * It's up to the caller to free the string memory with xmlFree(). + */ +xmlChar * +xmlXPathCastToString(xmlXPathObjectPtr val) { + xmlChar *ret = NULL; + + if (val == NULL) + return(xmlStrdup((const xmlChar *) "")); + switch (val->type) { + case XPATH_UNDEFINED: +#ifdef DEBUG_EXPR + xmlGenericError(xmlGenericErrorContext, "String: undefined\n"); +#endif + ret = xmlStrdup((const xmlChar *) ""); + break; + case XPATH_NODESET: + case XPATH_XSLT_TREE: + ret = xmlXPathCastNodeSetToString(val->nodesetval); + break; + case XPATH_STRING: + return(xmlStrdup(val->stringval)); + case XPATH_BOOLEAN: + ret = xmlXPathCastBooleanToString(val->boolval); + break; + case XPATH_NUMBER: { + ret = xmlXPathCastNumberToString(val->floatval); + break; + } + case XPATH_USERS: + case XPATH_POINT: + case XPATH_RANGE: + case XPATH_LOCATIONSET: + TODO + ret = xmlStrdup((const xmlChar *) ""); + break; + } + return(ret); +} + +/** + * xmlXPathConvertString: + * @val: an XPath object + * + * Converts an existing object to its string() equivalent + * + * Returns the new object, the old one is freed (or the operation + * is done directly on @val) + */ +xmlXPathObjectPtr +xmlXPathConvertString(xmlXPathObjectPtr val) { + xmlChar *res = NULL; + + if (val == NULL) + return(xmlXPathNewCString("")); + + switch (val->type) { + case XPATH_UNDEFINED: +#ifdef DEBUG_EXPR + xmlGenericError(xmlGenericErrorContext, "STRING: undefined\n"); +#endif + break; + case XPATH_NODESET: + case XPATH_XSLT_TREE: + res = xmlXPathCastNodeSetToString(val->nodesetval); + break; + case XPATH_STRING: + return(val); + case XPATH_BOOLEAN: + res = xmlXPathCastBooleanToString(val->boolval); + break; + case XPATH_NUMBER: + res = xmlXPathCastNumberToString(val->floatval); + break; + case XPATH_USERS: + case XPATH_POINT: + case XPATH_RANGE: + case XPATH_LOCATIONSET: + TODO; + break; + } + xmlXPathFreeObject(val); + if (res == NULL) + return(xmlXPathNewCString("")); + return(xmlXPathWrapString(res)); +} + +/** + * xmlXPathCastBooleanToNumber: + * @val: a boolean + * + * Converts a boolean to its number value + * + * Returns the number value + */ +double +xmlXPathCastBooleanToNumber(int val) { + if (val) + return(1.0); + return(0.0); +} + +/** + * xmlXPathCastStringToNumber: + * @val: a string + * + * Converts a string to its number value + * + * Returns the number value + */ +double +xmlXPathCastStringToNumber(const xmlChar * val) { + return(xmlXPathStringEvalNumber(val)); +} + +/** + * xmlXPathCastNodeToNumber: + * @node: a node + * + * Converts a node to its number value + * + * Returns the number value + */ +double +xmlXPathCastNodeToNumber (xmlNodePtr node) { + xmlChar *strval; + double ret; + + if (node == NULL) + return(xmlXPathNAN); + strval = xmlXPathCastNodeToString(node); + if (strval == NULL) + return(xmlXPathNAN); + ret = xmlXPathCastStringToNumber(strval); + xmlFree(strval); + + return(ret); +} + +/** + * xmlXPathCastNodeSetToNumber: + * @ns: a node-set + * + * Converts a node-set to its number value + * + * Returns the number value + */ +double +xmlXPathCastNodeSetToNumber (xmlNodeSetPtr ns) { + xmlChar *str; + double ret; + + if (ns == NULL) + return(xmlXPathNAN); + str = xmlXPathCastNodeSetToString(ns); + ret = xmlXPathCastStringToNumber(str); + xmlFree(str); + return(ret); +} + +/** + * xmlXPathCastToNumber: + * @val: an XPath object + * + * Converts an XPath object to its number value + * + * Returns the number value + */ +double +xmlXPathCastToNumber(xmlXPathObjectPtr val) { + double ret = 0.0; + + if (val == NULL) + return(xmlXPathNAN); + switch (val->type) { + case XPATH_UNDEFINED: +#ifdef DEGUB_EXPR + xmlGenericError(xmlGenericErrorContext, "NUMBER: undefined\n"); +#endif + ret = xmlXPathNAN; + break; + case XPATH_NODESET: + case XPATH_XSLT_TREE: + ret = xmlXPathCastNodeSetToNumber(val->nodesetval); + break; + case XPATH_STRING: + ret = xmlXPathCastStringToNumber(val->stringval); + break; + case XPATH_NUMBER: + ret = val->floatval; + break; + case XPATH_BOOLEAN: + ret = xmlXPathCastBooleanToNumber(val->boolval); + break; + case XPATH_USERS: + case XPATH_POINT: + case XPATH_RANGE: + case XPATH_LOCATIONSET: + TODO; + ret = xmlXPathNAN; + break; + } + return(ret); +} + +/** + * xmlXPathConvertNumber: + * @val: an XPath object + * + * Converts an existing object to its number() equivalent + * + * Returns the new object, the old one is freed (or the operation + * is done directly on @val) + */ +xmlXPathObjectPtr +xmlXPathConvertNumber(xmlXPathObjectPtr val) { + xmlXPathObjectPtr ret; + + if (val == NULL) + return(xmlXPathNewFloat(0.0)); + if (val->type == XPATH_NUMBER) + return(val); + ret = xmlXPathNewFloat(xmlXPathCastToNumber(val)); + xmlXPathFreeObject(val); + return(ret); +} + +/** + * xmlXPathCastNumberToBoolean: + * @val: a number + * + * Converts a number to its boolean value + * + * Returns the boolean value + */ +int +xmlXPathCastNumberToBoolean (double val) { + if (xmlXPathIsNaN(val) || (val == 0.0)) + return(0); + return(1); +} + +/** + * xmlXPathCastStringToBoolean: + * @val: a string + * + * Converts a string to its boolean value + * + * Returns the boolean value + */ +int +xmlXPathCastStringToBoolean (const xmlChar *val) { + if ((val == NULL) || (xmlStrlen(val) == 0)) + return(0); + return(1); +} + +/** + * xmlXPathCastNodeSetToBoolean: + * @ns: a node-set + * + * Converts a node-set to its boolean value + * + * Returns the boolean value + */ +int +xmlXPathCastNodeSetToBoolean (xmlNodeSetPtr ns) { + if ((ns == NULL) || (ns->nodeNr == 0)) + return(0); + return(1); +} + +/** + * xmlXPathCastToBoolean: + * @val: an XPath object + * + * Converts an XPath object to its boolean value + * + * Returns the boolean value + */ +int +xmlXPathCastToBoolean (xmlXPathObjectPtr val) { + int ret = 0; + + if (val == NULL) + return(0); + switch (val->type) { + case XPATH_UNDEFINED: +#ifdef DEBUG_EXPR + xmlGenericError(xmlGenericErrorContext, "BOOLEAN: undefined\n"); +#endif + ret = 0; + break; + case XPATH_NODESET: + case XPATH_XSLT_TREE: + ret = xmlXPathCastNodeSetToBoolean(val->nodesetval); + break; + case XPATH_STRING: + ret = xmlXPathCastStringToBoolean(val->stringval); + break; + case XPATH_NUMBER: + ret = xmlXPathCastNumberToBoolean(val->floatval); + break; + case XPATH_BOOLEAN: + ret = val->boolval; + break; + case XPATH_USERS: + case XPATH_POINT: + case XPATH_RANGE: + case XPATH_LOCATIONSET: + TODO; + ret = 0; + break; + } + return(ret); +} + + +/** + * xmlXPathConvertBoolean: + * @val: an XPath object + * + * Converts an existing object to its boolean() equivalent + * + * Returns the new object, the old one is freed (or the operation + * is done directly on @val) + */ +xmlXPathObjectPtr +xmlXPathConvertBoolean(xmlXPathObjectPtr val) { + xmlXPathObjectPtr ret; + + if (val == NULL) + return(xmlXPathNewBoolean(0)); + if (val->type == XPATH_BOOLEAN) + return(val); + ret = xmlXPathNewBoolean(xmlXPathCastToBoolean(val)); + xmlXPathFreeObject(val); + return(ret); +} + +/************************************************************************ + * * + * Routines to handle XPath contexts * + * * + ************************************************************************/ + +/** + * xmlXPathNewContext: + * @doc: the XML document + * + * Create a new xmlXPathContext + * + * Returns the xmlXPathContext just allocated. The caller will need to free it. + */ +xmlXPathContextPtr +xmlXPathNewContext(xmlDocPtr doc) { + xmlXPathContextPtr ret; + + ret = (xmlXPathContextPtr) xmlMalloc(sizeof(xmlXPathContext)); + if (ret == NULL) { + xmlXPathErrMemory(NULL, "creating context\n"); + return(NULL); + } + memset(ret, 0 , (size_t) sizeof(xmlXPathContext)); + ret->doc = doc; + ret->node = NULL; + + ret->varHash = NULL; + + ret->nb_types = 0; + ret->max_types = 0; + ret->types = NULL; + + ret->funcHash = xmlHashCreate(0); + + ret->nb_axis = 0; + ret->max_axis = 0; + ret->axis = NULL; + + ret->nsHash = NULL; + ret->user = NULL; + + ret->contextSize = -1; + ret->proximityPosition = -1; + +#ifdef XP_DEFAULT_CACHE_ON + if (xmlXPathContextSetCache(ret, 1, -1, 0) == -1) { + xmlXPathFreeContext(ret); + return(NULL); + } +#endif + + xmlXPathRegisterAllFunctions(ret); + + return(ret); +} + +/** + * xmlXPathFreeContext: + * @ctxt: the context to free + * + * Free up an xmlXPathContext + */ +void +xmlXPathFreeContext(xmlXPathContextPtr ctxt) { + if (ctxt == NULL) return; + + if (ctxt->cache != NULL) + xmlXPathFreeCache((xmlXPathContextCachePtr) ctxt->cache); + xmlXPathRegisteredNsCleanup(ctxt); + xmlXPathRegisteredFuncsCleanup(ctxt); + xmlXPathRegisteredVariablesCleanup(ctxt); + xmlResetError(&ctxt->lastError); + xmlFree(ctxt); +} + +/************************************************************************ + * * + * Routines to handle XPath parser contexts * + * * + ************************************************************************/ + +#define CHECK_CTXT(ctxt) \ + if (ctxt == NULL) { \ + __xmlRaiseError(NULL, NULL, NULL, \ + NULL, NULL, XML_FROM_XPATH, \ + XML_ERR_INTERNAL_ERROR, XML_ERR_FATAL, \ + __FILE__, __LINE__, \ + NULL, NULL, NULL, 0, 0, \ + "NULL context pointer\n"); \ + return(NULL); \ + } \ + +#define CHECK_CTXT_NEG(ctxt) \ + if (ctxt == NULL) { \ + __xmlRaiseError(NULL, NULL, NULL, \ + NULL, NULL, XML_FROM_XPATH, \ + XML_ERR_INTERNAL_ERROR, XML_ERR_FATAL, \ + __FILE__, __LINE__, \ + NULL, NULL, NULL, 0, 0, \ + "NULL context pointer\n"); \ + return(-1); \ + } \ + + +#define CHECK_CONTEXT(ctxt) \ + if ((ctxt == NULL) || (ctxt->doc == NULL) || \ + (ctxt->doc->children == NULL)) { \ + xmlXPatherror(ctxt, __FILE__, __LINE__, XPATH_INVALID_CTXT); \ + return(NULL); \ + } + + +/** + * xmlXPathNewParserContext: + * @str: the XPath expression + * @ctxt: the XPath context + * + * Create a new xmlXPathParserContext + * + * Returns the xmlXPathParserContext just allocated. + */ +xmlXPathParserContextPtr +xmlXPathNewParserContext(const xmlChar *str, xmlXPathContextPtr ctxt) { + xmlXPathParserContextPtr ret; + + ret = (xmlXPathParserContextPtr) xmlMalloc(sizeof(xmlXPathParserContext)); + if (ret == NULL) { + xmlXPathErrMemory(ctxt, "creating parser context\n"); + return(NULL); + } + memset(ret, 0 , (size_t) sizeof(xmlXPathParserContext)); + ret->cur = ret->base = str; + ret->context = ctxt; + + ret->comp = xmlXPathNewCompExpr(); + if (ret->comp == NULL) { + xmlFree(ret->valueTab); + xmlFree(ret); + return(NULL); + } + if ((ctxt != NULL) && (ctxt->dict != NULL)) { + ret->comp->dict = ctxt->dict; + xmlDictReference(ret->comp->dict); + } + + return(ret); +} + +/** + * xmlXPathCompParserContext: + * @comp: the XPath compiled expression + * @ctxt: the XPath context + * + * Create a new xmlXPathParserContext when processing a compiled expression + * + * Returns the xmlXPathParserContext just allocated. + */ +static xmlXPathParserContextPtr +xmlXPathCompParserContext(xmlXPathCompExprPtr comp, xmlXPathContextPtr ctxt) { + xmlXPathParserContextPtr ret; + + ret = (xmlXPathParserContextPtr) xmlMalloc(sizeof(xmlXPathParserContext)); + if (ret == NULL) { + xmlXPathErrMemory(ctxt, "creating evaluation context\n"); + return(NULL); + } + memset(ret, 0 , (size_t) sizeof(xmlXPathParserContext)); + + /* Allocate the value stack */ + ret->valueTab = (xmlXPathObjectPtr *) + xmlMalloc(10 * sizeof(xmlXPathObjectPtr)); + if (ret->valueTab == NULL) { + xmlFree(ret); + xmlXPathErrMemory(ctxt, "creating evaluation context\n"); + return(NULL); + } + ret->valueNr = 0; + ret->valueMax = 10; + ret->value = NULL; + ret->valueFrame = 0; + + ret->context = ctxt; + ret->comp = comp; + + return(ret); +} + +/** + * xmlXPathFreeParserContext: + * @ctxt: the context to free + * + * Free up an xmlXPathParserContext + */ +void +xmlXPathFreeParserContext(xmlXPathParserContextPtr ctxt) { + if (ctxt->valueTab != NULL) { + xmlFree(ctxt->valueTab); + } + if (ctxt->comp != NULL) { +#ifdef XPATH_STREAMING + if (ctxt->comp->stream != NULL) { + xmlFreePatternList(ctxt->comp->stream); + ctxt->comp->stream = NULL; + } +#endif + xmlXPathFreeCompExpr(ctxt->comp); + } + xmlFree(ctxt); +} + +/************************************************************************ + * * + * The implicit core function library * + * * + ************************************************************************/ + +/** + * xmlXPathNodeValHash: + * @node: a node pointer + * + * Function computing the beginning of the string value of the node, + * used to speed up comparisons + * + * Returns an int usable as a hash + */ +static unsigned int +xmlXPathNodeValHash(xmlNodePtr node) { + int len = 2; + const xmlChar * string = NULL; + xmlNodePtr tmp = NULL; + unsigned int ret = 0; + + if (node == NULL) + return(0); + + if (node->type == XML_DOCUMENT_NODE) { + tmp = xmlDocGetRootElement((xmlDocPtr) node); + if (tmp == NULL) + node = node->children; + else + node = tmp; + + if (node == NULL) + return(0); + } + + switch (node->type) { + case XML_COMMENT_NODE: + case XML_PI_NODE: + case XML_CDATA_SECTION_NODE: + case XML_TEXT_NODE: + string = node->content; + if (string == NULL) + return(0); + if (string[0] == 0) + return(0); + return(((unsigned int) string[0]) + + (((unsigned int) string[1]) << 8)); + case XML_NAMESPACE_DECL: + string = ((xmlNsPtr)node)->href; + if (string == NULL) + return(0); + if (string[0] == 0) + return(0); + return(((unsigned int) string[0]) + + (((unsigned int) string[1]) << 8)); + case XML_ATTRIBUTE_NODE: + tmp = ((xmlAttrPtr) node)->children; + break; + case XML_ELEMENT_NODE: + tmp = node->children; + break; + default: + return(0); + } + while (tmp != NULL) { + switch (tmp->type) { + case XML_COMMENT_NODE: + case XML_PI_NODE: + case XML_CDATA_SECTION_NODE: + case XML_TEXT_NODE: + string = tmp->content; + break; + case XML_NAMESPACE_DECL: + string = ((xmlNsPtr)tmp)->href; + break; + default: + break; + } + if ((string != NULL) && (string[0] != 0)) { + if (len == 1) { + return(ret + (((unsigned int) string[0]) << 8)); + } + if (string[1] == 0) { + len = 1; + ret = (unsigned int) string[0]; + } else { + return(((unsigned int) string[0]) + + (((unsigned int) string[1]) << 8)); + } + } + /* + * Skip to next node + */ + if ((tmp->children != NULL) && (tmp->type != XML_DTD_NODE)) { + if (tmp->children->type != XML_ENTITY_DECL) { + tmp = tmp->children; + continue; + } + } + if (tmp == node) + break; + + if (tmp->next != NULL) { + tmp = tmp->next; + continue; + } + + do { + tmp = tmp->parent; + if (tmp == NULL) + break; + if (tmp == node) { + tmp = NULL; + break; + } + if (tmp->next != NULL) { + tmp = tmp->next; + break; + } + } while (tmp != NULL); + } + return(ret); +} + +/** + * xmlXPathStringHash: + * @string: a string + * + * Function computing the beginning of the string value of the node, + * used to speed up comparisons + * + * Returns an int usable as a hash + */ +static unsigned int +xmlXPathStringHash(const xmlChar * string) { + if (string == NULL) + return((unsigned int) 0); + if (string[0] == 0) + return(0); + return(((unsigned int) string[0]) + + (((unsigned int) string[1]) << 8)); +} + +/** + * xmlXPathCompareNodeSetFloat: + * @ctxt: the XPath Parser context + * @inf: less than (1) or greater than (0) + * @strict: is the comparison strict + * @arg: the node set + * @f: the value + * + * Implement the compare operation between a nodeset and a number + * @ns < @val (1, 1, ... + * @ns <= @val (1, 0, ... + * @ns > @val (0, 1, ... + * @ns >= @val (0, 0, ... + * + * If one object to be compared is a node-set and the other is a number, + * then the comparison will be true if and only if there is a node in the + * node-set such that the result of performing the comparison on the number + * to be compared and on the result of converting the string-value of that + * node to a number using the number function is true. + * + * Returns 0 or 1 depending on the results of the test. + */ +static int +xmlXPathCompareNodeSetFloat(xmlXPathParserContextPtr ctxt, int inf, int strict, + xmlXPathObjectPtr arg, xmlXPathObjectPtr f) { + int i, ret = 0; + xmlNodeSetPtr ns; + xmlChar *str2; + + if ((f == NULL) || (arg == NULL) || + ((arg->type != XPATH_NODESET) && (arg->type != XPATH_XSLT_TREE))) { + xmlXPathReleaseObject(ctxt->context, arg); + xmlXPathReleaseObject(ctxt->context, f); + return(0); + } + ns = arg->nodesetval; + if (ns != NULL) { + for (i = 0;i < ns->nodeNr;i++) { + str2 = xmlXPathCastNodeToString(ns->nodeTab[i]); + if (str2 != NULL) { + valuePush(ctxt, + xmlXPathCacheNewString(ctxt->context, str2)); + xmlFree(str2); + xmlXPathNumberFunction(ctxt, 1); + valuePush(ctxt, xmlXPathCacheObjectCopy(ctxt->context, f)); + ret = xmlXPathCompareValues(ctxt, inf, strict); + if (ret) + break; + } + } + } + xmlXPathReleaseObject(ctxt->context, arg); + xmlXPathReleaseObject(ctxt->context, f); + return(ret); +} + +/** + * xmlXPathCompareNodeSetString: + * @ctxt: the XPath Parser context + * @inf: less than (1) or greater than (0) + * @strict: is the comparison strict + * @arg: the node set + * @s: the value + * + * Implement the compare operation between a nodeset and a string + * @ns < @val (1, 1, ... + * @ns <= @val (1, 0, ... + * @ns > @val (0, 1, ... + * @ns >= @val (0, 0, ... + * + * If one object to be compared is a node-set and the other is a string, + * then the comparison will be true if and only if there is a node in + * the node-set such that the result of performing the comparison on the + * string-value of the node and the other string is true. + * + * Returns 0 or 1 depending on the results of the test. + */ +static int +xmlXPathCompareNodeSetString(xmlXPathParserContextPtr ctxt, int inf, int strict, + xmlXPathObjectPtr arg, xmlXPathObjectPtr s) { + int i, ret = 0; + xmlNodeSetPtr ns; + xmlChar *str2; + + if ((s == NULL) || (arg == NULL) || + ((arg->type != XPATH_NODESET) && (arg->type != XPATH_XSLT_TREE))) { + xmlXPathReleaseObject(ctxt->context, arg); + xmlXPathReleaseObject(ctxt->context, s); + return(0); + } + ns = arg->nodesetval; + if (ns != NULL) { + for (i = 0;i < ns->nodeNr;i++) { + str2 = xmlXPathCastNodeToString(ns->nodeTab[i]); + if (str2 != NULL) { + valuePush(ctxt, + xmlXPathCacheNewString(ctxt->context, str2)); + xmlFree(str2); + valuePush(ctxt, xmlXPathCacheObjectCopy(ctxt->context, s)); + ret = xmlXPathCompareValues(ctxt, inf, strict); + if (ret) + break; + } + } + } + xmlXPathReleaseObject(ctxt->context, arg); + xmlXPathReleaseObject(ctxt->context, s); + return(ret); +} + +/** + * xmlXPathCompareNodeSets: + * @inf: less than (1) or greater than (0) + * @strict: is the comparison strict + * @arg1: the first node set object + * @arg2: the second node set object + * + * Implement the compare operation on nodesets: + * + * If both objects to be compared are node-sets, then the comparison + * will be true if and only if there is a node in the first node-set + * and a node in the second node-set such that the result of performing + * the comparison on the string-values of the two nodes is true. + * .... + * When neither object to be compared is a node-set and the operator + * is <=, <, >= or >, then the objects are compared by converting both + * objects to numbers and comparing the numbers according to IEEE 754. + * .... + * The number function converts its argument to a number as follows: + * - a string that consists of optional whitespace followed by an + * optional minus sign followed by a Number followed by whitespace + * is converted to the IEEE 754 number that is nearest (according + * to the IEEE 754 round-to-nearest rule) to the mathematical value + * represented by the string; any other string is converted to NaN + * + * Conclusion all nodes need to be converted first to their string value + * and then the comparison must be done when possible + */ +static int +xmlXPathCompareNodeSets(int inf, int strict, + xmlXPathObjectPtr arg1, xmlXPathObjectPtr arg2) { + int i, j, init = 0; + double val1; + double *values2; + int ret = 0; + xmlNodeSetPtr ns1; + xmlNodeSetPtr ns2; + + if ((arg1 == NULL) || + ((arg1->type != XPATH_NODESET) && (arg1->type != XPATH_XSLT_TREE))) { + xmlXPathFreeObject(arg2); + return(0); + } + if ((arg2 == NULL) || + ((arg2->type != XPATH_NODESET) && (arg2->type != XPATH_XSLT_TREE))) { + xmlXPathFreeObject(arg1); + xmlXPathFreeObject(arg2); + return(0); + } + + ns1 = arg1->nodesetval; + ns2 = arg2->nodesetval; + + if ((ns1 == NULL) || (ns1->nodeNr <= 0)) { + xmlXPathFreeObject(arg1); + xmlXPathFreeObject(arg2); + return(0); + } + if ((ns2 == NULL) || (ns2->nodeNr <= 0)) { + xmlXPathFreeObject(arg1); + xmlXPathFreeObject(arg2); + return(0); + } + + values2 = (double *) xmlMalloc(ns2->nodeNr * sizeof(double)); + if (values2 == NULL) { + xmlXPathErrMemory(NULL, "comparing nodesets\n"); + xmlXPathFreeObject(arg1); + xmlXPathFreeObject(arg2); + return(0); + } + for (i = 0;i < ns1->nodeNr;i++) { + val1 = xmlXPathCastNodeToNumber(ns1->nodeTab[i]); + if (xmlXPathIsNaN(val1)) + continue; + for (j = 0;j < ns2->nodeNr;j++) { + if (init == 0) { + values2[j] = xmlXPathCastNodeToNumber(ns2->nodeTab[j]); + } + if (xmlXPathIsNaN(values2[j])) + continue; + if (inf && strict) + ret = (val1 < values2[j]); + else if (inf && !strict) + ret = (val1 <= values2[j]); + else if (!inf && strict) + ret = (val1 > values2[j]); + else if (!inf && !strict) + ret = (val1 >= values2[j]); + if (ret) + break; + } + if (ret) + break; + init = 1; + } + xmlFree(values2); + xmlXPathFreeObject(arg1); + xmlXPathFreeObject(arg2); + return(ret); +} + +/** + * xmlXPathCompareNodeSetValue: + * @ctxt: the XPath Parser context + * @inf: less than (1) or greater than (0) + * @strict: is the comparison strict + * @arg: the node set + * @val: the value + * + * Implement the compare operation between a nodeset and a value + * @ns < @val (1, 1, ... + * @ns <= @val (1, 0, ... + * @ns > @val (0, 1, ... + * @ns >= @val (0, 0, ... + * + * If one object to be compared is a node-set and the other is a boolean, + * then the comparison will be true if and only if the result of performing + * the comparison on the boolean and on the result of converting + * the node-set to a boolean using the boolean function is true. + * + * Returns 0 or 1 depending on the results of the test. + */ +static int +xmlXPathCompareNodeSetValue(xmlXPathParserContextPtr ctxt, int inf, int strict, + xmlXPathObjectPtr arg, xmlXPathObjectPtr val) { + if ((val == NULL) || (arg == NULL) || + ((arg->type != XPATH_NODESET) && (arg->type != XPATH_XSLT_TREE))) + return(0); + + switch(val->type) { + case XPATH_NUMBER: + return(xmlXPathCompareNodeSetFloat(ctxt, inf, strict, arg, val)); + case XPATH_NODESET: + case XPATH_XSLT_TREE: + return(xmlXPathCompareNodeSets(inf, strict, arg, val)); + case XPATH_STRING: + return(xmlXPathCompareNodeSetString(ctxt, inf, strict, arg, val)); + case XPATH_BOOLEAN: + valuePush(ctxt, arg); + xmlXPathBooleanFunction(ctxt, 1); + valuePush(ctxt, val); + return(xmlXPathCompareValues(ctxt, inf, strict)); + default: + TODO + } + return(0); +} + +/** + * xmlXPathEqualNodeSetString: + * @arg: the nodeset object argument + * @str: the string to compare to. + * @neq: flag to show whether for '=' (0) or '!=' (1) + * + * Implement the equal operation on XPath objects content: @arg1 == @arg2 + * If one object to be compared is a node-set and the other is a string, + * then the comparison will be true if and only if there is a node in + * the node-set such that the result of performing the comparison on the + * string-value of the node and the other string is true. + * + * Returns 0 or 1 depending on the results of the test. + */ +static int +xmlXPathEqualNodeSetString(xmlXPathObjectPtr arg, const xmlChar * str, int neq) +{ + int i; + xmlNodeSetPtr ns; + xmlChar *str2; + unsigned int hash; + + if ((str == NULL) || (arg == NULL) || + ((arg->type != XPATH_NODESET) && (arg->type != XPATH_XSLT_TREE))) + return (0); + ns = arg->nodesetval; + /* + * A NULL nodeset compared with a string is always false + * (since there is no node equal, and no node not equal) + */ + if ((ns == NULL) || (ns->nodeNr <= 0) ) + return (0); + hash = xmlXPathStringHash(str); + for (i = 0; i < ns->nodeNr; i++) { + if (xmlXPathNodeValHash(ns->nodeTab[i]) == hash) { + str2 = xmlNodeGetContent(ns->nodeTab[i]); + if ((str2 != NULL) && (xmlStrEqual(str, str2))) { + xmlFree(str2); + if (neq) + continue; + return (1); + } else if ((str2 == NULL) && (xmlStrEqual(str, BAD_CAST ""))) { + if (neq) + continue; + return (1); + } else if (neq) { + if (str2 != NULL) + xmlFree(str2); + return (1); + } + if (str2 != NULL) + xmlFree(str2); + } else if (neq) + return (1); + } + return (0); +} + +/** + * xmlXPathEqualNodeSetFloat: + * @arg: the nodeset object argument + * @f: the float to compare to + * @neq: flag to show whether to compare '=' (0) or '!=' (1) + * + * Implement the equal operation on XPath objects content: @arg1 == @arg2 + * If one object to be compared is a node-set and the other is a number, + * then the comparison will be true if and only if there is a node in + * the node-set such that the result of performing the comparison on the + * number to be compared and on the result of converting the string-value + * of that node to a number using the number function is true. + * + * Returns 0 or 1 depending on the results of the test. + */ +static int +xmlXPathEqualNodeSetFloat(xmlXPathParserContextPtr ctxt, + xmlXPathObjectPtr arg, double f, int neq) { + int i, ret=0; + xmlNodeSetPtr ns; + xmlChar *str2; + xmlXPathObjectPtr val; + double v; + + if ((arg == NULL) || + ((arg->type != XPATH_NODESET) && (arg->type != XPATH_XSLT_TREE))) + return(0); + + ns = arg->nodesetval; + if (ns != NULL) { + for (i=0;i<ns->nodeNr;i++) { + str2 = xmlXPathCastNodeToString(ns->nodeTab[i]); + if (str2 != NULL) { + valuePush(ctxt, xmlXPathCacheNewString(ctxt->context, str2)); + xmlFree(str2); + xmlXPathNumberFunction(ctxt, 1); + val = valuePop(ctxt); + v = val->floatval; + xmlXPathReleaseObject(ctxt->context, val); + if (!xmlXPathIsNaN(v)) { + if ((!neq) && (v==f)) { + ret = 1; + break; + } else if ((neq) && (v!=f)) { + ret = 1; + break; + } + } else { /* NaN is unequal to any value */ + if (neq) + ret = 1; + } + } + } + } + + return(ret); +} + + +/** + * xmlXPathEqualNodeSets: + * @arg1: first nodeset object argument + * @arg2: second nodeset object argument + * @neq: flag to show whether to test '=' (0) or '!=' (1) + * + * Implement the equal / not equal operation on XPath nodesets: + * @arg1 == @arg2 or @arg1 != @arg2 + * If both objects to be compared are node-sets, then the comparison + * will be true if and only if there is a node in the first node-set and + * a node in the second node-set such that the result of performing the + * comparison on the string-values of the two nodes is true. + * + * (needless to say, this is a costly operation) + * + * Returns 0 or 1 depending on the results of the test. + */ +static int +xmlXPathEqualNodeSets(xmlXPathObjectPtr arg1, xmlXPathObjectPtr arg2, int neq) { + int i, j; + unsigned int *hashs1; + unsigned int *hashs2; + xmlChar **values1; + xmlChar **values2; + int ret = 0; + xmlNodeSetPtr ns1; + xmlNodeSetPtr ns2; + + if ((arg1 == NULL) || + ((arg1->type != XPATH_NODESET) && (arg1->type != XPATH_XSLT_TREE))) + return(0); + if ((arg2 == NULL) || + ((arg2->type != XPATH_NODESET) && (arg2->type != XPATH_XSLT_TREE))) + return(0); + + ns1 = arg1->nodesetval; + ns2 = arg2->nodesetval; + + if ((ns1 == NULL) || (ns1->nodeNr <= 0)) + return(0); + if ((ns2 == NULL) || (ns2->nodeNr <= 0)) + return(0); + + /* + * for equal, check if there is a node pertaining to both sets + */ + if (neq == 0) + for (i = 0;i < ns1->nodeNr;i++) + for (j = 0;j < ns2->nodeNr;j++) + if (ns1->nodeTab[i] == ns2->nodeTab[j]) + return(1); + + values1 = (xmlChar **) xmlMalloc(ns1->nodeNr * sizeof(xmlChar *)); + if (values1 == NULL) { + xmlXPathErrMemory(NULL, "comparing nodesets\n"); + return(0); + } + hashs1 = (unsigned int *) xmlMalloc(ns1->nodeNr * sizeof(unsigned int)); + if (hashs1 == NULL) { + xmlXPathErrMemory(NULL, "comparing nodesets\n"); + xmlFree(values1); + return(0); + } + memset(values1, 0, ns1->nodeNr * sizeof(xmlChar *)); + values2 = (xmlChar **) xmlMalloc(ns2->nodeNr * sizeof(xmlChar *)); + if (values2 == NULL) { + xmlXPathErrMemory(NULL, "comparing nodesets\n"); + xmlFree(hashs1); + xmlFree(values1); + return(0); + } + hashs2 = (unsigned int *) xmlMalloc(ns2->nodeNr * sizeof(unsigned int)); + if (hashs2 == NULL) { + xmlXPathErrMemory(NULL, "comparing nodesets\n"); + xmlFree(hashs1); + xmlFree(values1); + xmlFree(values2); + return(0); + } + memset(values2, 0, ns2->nodeNr * sizeof(xmlChar *)); + for (i = 0;i < ns1->nodeNr;i++) { + hashs1[i] = xmlXPathNodeValHash(ns1->nodeTab[i]); + for (j = 0;j < ns2->nodeNr;j++) { + if (i == 0) + hashs2[j] = xmlXPathNodeValHash(ns2->nodeTab[j]); + if (hashs1[i] != hashs2[j]) { + if (neq) { + ret = 1; + break; + } + } + else { + if (values1[i] == NULL) + values1[i] = xmlNodeGetContent(ns1->nodeTab[i]); + if (values2[j] == NULL) + values2[j] = xmlNodeGetContent(ns2->nodeTab[j]); + ret = xmlStrEqual(values1[i], values2[j]) ^ neq; + if (ret) + break; + } + } + if (ret) + break; + } + for (i = 0;i < ns1->nodeNr;i++) + if (values1[i] != NULL) + xmlFree(values1[i]); + for (j = 0;j < ns2->nodeNr;j++) + if (values2[j] != NULL) + xmlFree(values2[j]); + xmlFree(values1); + xmlFree(values2); + xmlFree(hashs1); + xmlFree(hashs2); + return(ret); +} + +static int +xmlXPathEqualValuesCommon(xmlXPathParserContextPtr ctxt, + xmlXPathObjectPtr arg1, xmlXPathObjectPtr arg2) { + int ret = 0; + /* + *At this point we are assured neither arg1 nor arg2 + *is a nodeset, so we can just pick the appropriate routine. + */ + switch (arg1->type) { + case XPATH_UNDEFINED: +#ifdef DEBUG_EXPR + xmlGenericError(xmlGenericErrorContext, + "Equal: undefined\n"); +#endif + break; + case XPATH_BOOLEAN: + switch (arg2->type) { + case XPATH_UNDEFINED: +#ifdef DEBUG_EXPR + xmlGenericError(xmlGenericErrorContext, + "Equal: undefined\n"); +#endif + break; + case XPATH_BOOLEAN: +#ifdef DEBUG_EXPR + xmlGenericError(xmlGenericErrorContext, + "Equal: %d boolean %d \n", + arg1->boolval, arg2->boolval); +#endif + ret = (arg1->boolval == arg2->boolval); + break; + case XPATH_NUMBER: + ret = (arg1->boolval == + xmlXPathCastNumberToBoolean(arg2->floatval)); + break; + case XPATH_STRING: + if ((arg2->stringval == NULL) || + (arg2->stringval[0] == 0)) ret = 0; + else + ret = 1; + ret = (arg1->boolval == ret); + break; + case XPATH_USERS: + case XPATH_POINT: + case XPATH_RANGE: + case XPATH_LOCATIONSET: + TODO + break; + case XPATH_NODESET: + case XPATH_XSLT_TREE: + break; + } + break; + case XPATH_NUMBER: + switch (arg2->type) { + case XPATH_UNDEFINED: +#ifdef DEBUG_EXPR + xmlGenericError(xmlGenericErrorContext, + "Equal: undefined\n"); +#endif + break; + case XPATH_BOOLEAN: + ret = (arg2->boolval== + xmlXPathCastNumberToBoolean(arg1->floatval)); + break; + case XPATH_STRING: + valuePush(ctxt, arg2); + xmlXPathNumberFunction(ctxt, 1); + arg2 = valuePop(ctxt); + /* no break on purpose */ + case XPATH_NUMBER: + /* Hand check NaN and Infinity equalities */ + if (xmlXPathIsNaN(arg1->floatval) || + xmlXPathIsNaN(arg2->floatval)) { + ret = 0; + } else if (xmlXPathIsInf(arg1->floatval) == 1) { + if (xmlXPathIsInf(arg2->floatval) == 1) + ret = 1; + else + ret = 0; + } else if (xmlXPathIsInf(arg1->floatval) == -1) { + if (xmlXPathIsInf(arg2->floatval) == -1) + ret = 1; + else + ret = 0; + } else if (xmlXPathIsInf(arg2->floatval) == 1) { + if (xmlXPathIsInf(arg1->floatval) == 1) + ret = 1; + else + ret = 0; + } else if (xmlXPathIsInf(arg2->floatval) == -1) { + if (xmlXPathIsInf(arg1->floatval) == -1) + ret = 1; + else + ret = 0; + } else { + ret = (arg1->floatval == arg2->floatval); + } + break; + case XPATH_USERS: + case XPATH_POINT: + case XPATH_RANGE: + case XPATH_LOCATIONSET: + TODO + break; + case XPATH_NODESET: + case XPATH_XSLT_TREE: + break; + } + break; + case XPATH_STRING: + switch (arg2->type) { + case XPATH_UNDEFINED: +#ifdef DEBUG_EXPR + xmlGenericError(xmlGenericErrorContext, + "Equal: undefined\n"); +#endif + break; + case XPATH_BOOLEAN: + if ((arg1->stringval == NULL) || + (arg1->stringval[0] == 0)) ret = 0; + else + ret = 1; + ret = (arg2->boolval == ret); + break; + case XPATH_STRING: + ret = xmlStrEqual(arg1->stringval, arg2->stringval); + break; + case XPATH_NUMBER: + valuePush(ctxt, arg1); + xmlXPathNumberFunction(ctxt, 1); + arg1 = valuePop(ctxt); + /* Hand check NaN and Infinity equalities */ + if (xmlXPathIsNaN(arg1->floatval) || + xmlXPathIsNaN(arg2->floatval)) { + ret = 0; + } else if (xmlXPathIsInf(arg1->floatval) == 1) { + if (xmlXPathIsInf(arg2->floatval) == 1) + ret = 1; + else + ret = 0; + } else if (xmlXPathIsInf(arg1->floatval) == -1) { + if (xmlXPathIsInf(arg2->floatval) == -1) + ret = 1; + else + ret = 0; + } else if (xmlXPathIsInf(arg2->floatval) == 1) { + if (xmlXPathIsInf(arg1->floatval) == 1) + ret = 1; + else + ret = 0; + } else if (xmlXPathIsInf(arg2->floatval) == -1) { + if (xmlXPathIsInf(arg1->floatval) == -1) + ret = 1; + else + ret = 0; + } else { + ret = (arg1->floatval == arg2->floatval); + } + break; + case XPATH_USERS: + case XPATH_POINT: + case XPATH_RANGE: + case XPATH_LOCATIONSET: + TODO + break; + case XPATH_NODESET: + case XPATH_XSLT_TREE: + break; + } + break; + case XPATH_USERS: + case XPATH_POINT: + case XPATH_RANGE: + case XPATH_LOCATIONSET: + TODO + break; + case XPATH_NODESET: + case XPATH_XSLT_TREE: + break; + } + xmlXPathReleaseObject(ctxt->context, arg1); + xmlXPathReleaseObject(ctxt->context, arg2); + return(ret); +} + +/** + * xmlXPathEqualValues: + * @ctxt: the XPath Parser context + * + * Implement the equal operation on XPath objects content: @arg1 == @arg2 + * + * Returns 0 or 1 depending on the results of the test. + */ +int +xmlXPathEqualValues(xmlXPathParserContextPtr ctxt) { + xmlXPathObjectPtr arg1, arg2, argtmp; + int ret = 0; + + if ((ctxt == NULL) || (ctxt->context == NULL)) return(0); + arg2 = valuePop(ctxt); + arg1 = valuePop(ctxt); + if ((arg1 == NULL) || (arg2 == NULL)) { + if (arg1 != NULL) + xmlXPathReleaseObject(ctxt->context, arg1); + else + xmlXPathReleaseObject(ctxt->context, arg2); + XP_ERROR0(XPATH_INVALID_OPERAND); + } + + if (arg1 == arg2) { +#ifdef DEBUG_EXPR + xmlGenericError(xmlGenericErrorContext, + "Equal: by pointer\n"); +#endif + xmlXPathFreeObject(arg1); + return(1); + } + + /* + *If either argument is a nodeset, it's a 'special case' + */ + if ((arg2->type == XPATH_NODESET) || (arg2->type == XPATH_XSLT_TREE) || + (arg1->type == XPATH_NODESET) || (arg1->type == XPATH_XSLT_TREE)) { + /* + *Hack it to assure arg1 is the nodeset + */ + if ((arg1->type != XPATH_NODESET) && (arg1->type != XPATH_XSLT_TREE)) { + argtmp = arg2; + arg2 = arg1; + arg1 = argtmp; + } + switch (arg2->type) { + case XPATH_UNDEFINED: +#ifdef DEBUG_EXPR + xmlGenericError(xmlGenericErrorContext, + "Equal: undefined\n"); +#endif + break; + case XPATH_NODESET: + case XPATH_XSLT_TREE: + ret = xmlXPathEqualNodeSets(arg1, arg2, 0); + break; + case XPATH_BOOLEAN: + if ((arg1->nodesetval == NULL) || + (arg1->nodesetval->nodeNr == 0)) ret = 0; + else + ret = 1; + ret = (ret == arg2->boolval); + break; + case XPATH_NUMBER: + ret = xmlXPathEqualNodeSetFloat(ctxt, arg1, arg2->floatval, 0); + break; + case XPATH_STRING: + ret = xmlXPathEqualNodeSetString(arg1, arg2->stringval, 0); + break; + case XPATH_USERS: + case XPATH_POINT: + case XPATH_RANGE: + case XPATH_LOCATIONSET: + TODO + break; + } + xmlXPathReleaseObject(ctxt->context, arg1); + xmlXPathReleaseObject(ctxt->context, arg2); + return(ret); + } + + return (xmlXPathEqualValuesCommon(ctxt, arg1, arg2)); +} + +/** + * xmlXPathNotEqualValues: + * @ctxt: the XPath Parser context + * + * Implement the equal operation on XPath objects content: @arg1 == @arg2 + * + * Returns 0 or 1 depending on the results of the test. + */ +int +xmlXPathNotEqualValues(xmlXPathParserContextPtr ctxt) { + xmlXPathObjectPtr arg1, arg2, argtmp; + int ret = 0; + + if ((ctxt == NULL) || (ctxt->context == NULL)) return(0); + arg2 = valuePop(ctxt); + arg1 = valuePop(ctxt); + if ((arg1 == NULL) || (arg2 == NULL)) { + if (arg1 != NULL) + xmlXPathReleaseObject(ctxt->context, arg1); + else + xmlXPathReleaseObject(ctxt->context, arg2); + XP_ERROR0(XPATH_INVALID_OPERAND); + } + + if (arg1 == arg2) { +#ifdef DEBUG_EXPR + xmlGenericError(xmlGenericErrorContext, + "NotEqual: by pointer\n"); +#endif + xmlXPathReleaseObject(ctxt->context, arg1); + return(0); + } + + /* + *If either argument is a nodeset, it's a 'special case' + */ + if ((arg2->type == XPATH_NODESET) || (arg2->type == XPATH_XSLT_TREE) || + (arg1->type == XPATH_NODESET) || (arg1->type == XPATH_XSLT_TREE)) { + /* + *Hack it to assure arg1 is the nodeset + */ + if ((arg1->type != XPATH_NODESET) && (arg1->type != XPATH_XSLT_TREE)) { + argtmp = arg2; + arg2 = arg1; + arg1 = argtmp; + } + switch (arg2->type) { + case XPATH_UNDEFINED: +#ifdef DEBUG_EXPR + xmlGenericError(xmlGenericErrorContext, + "NotEqual: undefined\n"); +#endif + break; + case XPATH_NODESET: + case XPATH_XSLT_TREE: + ret = xmlXPathEqualNodeSets(arg1, arg2, 1); + break; + case XPATH_BOOLEAN: + if ((arg1->nodesetval == NULL) || + (arg1->nodesetval->nodeNr == 0)) ret = 0; + else + ret = 1; + ret = (ret != arg2->boolval); + break; + case XPATH_NUMBER: + ret = xmlXPathEqualNodeSetFloat(ctxt, arg1, arg2->floatval, 1); + break; + case XPATH_STRING: + ret = xmlXPathEqualNodeSetString(arg1, arg2->stringval,1); + break; + case XPATH_USERS: + case XPATH_POINT: + case XPATH_RANGE: + case XPATH_LOCATIONSET: + TODO + break; + } + xmlXPathReleaseObject(ctxt->context, arg1); + xmlXPathReleaseObject(ctxt->context, arg2); + return(ret); + } + + return (!xmlXPathEqualValuesCommon(ctxt, arg1, arg2)); +} + +/** + * xmlXPathCompareValues: + * @ctxt: the XPath Parser context + * @inf: less than (1) or greater than (0) + * @strict: is the comparison strict + * + * Implement the compare operation on XPath objects: + * @arg1 < @arg2 (1, 1, ... + * @arg1 <= @arg2 (1, 0, ... + * @arg1 > @arg2 (0, 1, ... + * @arg1 >= @arg2 (0, 0, ... + * + * When neither object to be compared is a node-set and the operator is + * <=, <, >=, >, then the objects are compared by converted both objects + * to numbers and comparing the numbers according to IEEE 754. The < + * comparison will be true if and only if the first number is less than the + * second number. The <= comparison will be true if and only if the first + * number is less than or equal to the second number. The > comparison + * will be true if and only if the first number is greater than the second + * number. The >= comparison will be true if and only if the first number + * is greater than or equal to the second number. + * + * Returns 1 if the comparison succeeded, 0 if it failed + */ +int +xmlXPathCompareValues(xmlXPathParserContextPtr ctxt, int inf, int strict) { + int ret = 0, arg1i = 0, arg2i = 0; + xmlXPathObjectPtr arg1, arg2; + + if ((ctxt == NULL) || (ctxt->context == NULL)) return(0); + arg2 = valuePop(ctxt); + arg1 = valuePop(ctxt); + if ((arg1 == NULL) || (arg2 == NULL)) { + if (arg1 != NULL) + xmlXPathReleaseObject(ctxt->context, arg1); + else + xmlXPathReleaseObject(ctxt->context, arg2); + XP_ERROR0(XPATH_INVALID_OPERAND); + } + + if ((arg2->type == XPATH_NODESET) || (arg2->type == XPATH_XSLT_TREE) || + (arg1->type == XPATH_NODESET) || (arg1->type == XPATH_XSLT_TREE)) { + /* + * If either argument is a XPATH_NODESET or XPATH_XSLT_TREE the two arguments + * are not freed from within this routine; they will be freed from the + * called routine, e.g. xmlXPathCompareNodeSets or xmlXPathCompareNodeSetValue + */ + if (((arg2->type == XPATH_NODESET) || (arg2->type == XPATH_XSLT_TREE)) && + ((arg1->type == XPATH_NODESET) || (arg1->type == XPATH_XSLT_TREE))){ + ret = xmlXPathCompareNodeSets(inf, strict, arg1, arg2); + } else { + if ((arg1->type == XPATH_NODESET) || (arg1->type == XPATH_XSLT_TREE)) { + ret = xmlXPathCompareNodeSetValue(ctxt, inf, strict, + arg1, arg2); + } else { + ret = xmlXPathCompareNodeSetValue(ctxt, !inf, strict, + arg2, arg1); + } + } + return(ret); + } + + if (arg1->type != XPATH_NUMBER) { + valuePush(ctxt, arg1); + xmlXPathNumberFunction(ctxt, 1); + arg1 = valuePop(ctxt); + } + if (arg1->type != XPATH_NUMBER) { + xmlXPathFreeObject(arg1); + xmlXPathFreeObject(arg2); + XP_ERROR0(XPATH_INVALID_OPERAND); + } + if (arg2->type != XPATH_NUMBER) { + valuePush(ctxt, arg2); + xmlXPathNumberFunction(ctxt, 1); + arg2 = valuePop(ctxt); + } + if (arg2->type != XPATH_NUMBER) { + xmlXPathReleaseObject(ctxt->context, arg1); + xmlXPathReleaseObject(ctxt->context, arg2); + XP_ERROR0(XPATH_INVALID_OPERAND); + } + /* + * Add tests for infinity and nan + * => feedback on 3.4 for Inf and NaN + */ + /* Hand check NaN and Infinity comparisons */ + if (xmlXPathIsNaN(arg1->floatval) || xmlXPathIsNaN(arg2->floatval)) { + ret=0; + } else { + arg1i=xmlXPathIsInf(arg1->floatval); + arg2i=xmlXPathIsInf(arg2->floatval); + if (inf && strict) { + if ((arg1i == -1 && arg2i != -1) || + (arg2i == 1 && arg1i != 1)) { + ret = 1; + } else if (arg1i == 0 && arg2i == 0) { + ret = (arg1->floatval < arg2->floatval); + } else { + ret = 0; + } + } + else if (inf && !strict) { + if (arg1i == -1 || arg2i == 1) { + ret = 1; + } else if (arg1i == 0 && arg2i == 0) { + ret = (arg1->floatval <= arg2->floatval); + } else { + ret = 0; + } + } + else if (!inf && strict) { + if ((arg1i == 1 && arg2i != 1) || + (arg2i == -1 && arg1i != -1)) { + ret = 1; + } else if (arg1i == 0 && arg2i == 0) { + ret = (arg1->floatval > arg2->floatval); + } else { + ret = 0; + } + } + else if (!inf && !strict) { + if (arg1i == 1 || arg2i == -1) { + ret = 1; + } else if (arg1i == 0 && arg2i == 0) { + ret = (arg1->floatval >= arg2->floatval); + } else { + ret = 0; + } + } + } + xmlXPathReleaseObject(ctxt->context, arg1); + xmlXPathReleaseObject(ctxt->context, arg2); + return(ret); +} + +/** + * xmlXPathValueFlipSign: + * @ctxt: the XPath Parser context + * + * Implement the unary - operation on an XPath object + * The numeric operators convert their operands to numbers as if + * by calling the number function. + */ +void +xmlXPathValueFlipSign(xmlXPathParserContextPtr ctxt) { + if ((ctxt == NULL) || (ctxt->context == NULL)) return; + CAST_TO_NUMBER; + CHECK_TYPE(XPATH_NUMBER); + if (xmlXPathIsNaN(ctxt->value->floatval)) + ctxt->value->floatval=xmlXPathNAN; + else if (xmlXPathIsInf(ctxt->value->floatval) == 1) + ctxt->value->floatval=xmlXPathNINF; + else if (xmlXPathIsInf(ctxt->value->floatval) == -1) + ctxt->value->floatval=xmlXPathPINF; + else if (ctxt->value->floatval == 0) { + if (xmlXPathGetSign(ctxt->value->floatval) == 0) + ctxt->value->floatval = xmlXPathNZERO; + else + ctxt->value->floatval = 0; + } + else + ctxt->value->floatval = - ctxt->value->floatval; +} + +/** + * xmlXPathAddValues: + * @ctxt: the XPath Parser context + * + * Implement the add operation on XPath objects: + * The numeric operators convert their operands to numbers as if + * by calling the number function. + */ +void +xmlXPathAddValues(xmlXPathParserContextPtr ctxt) { + xmlXPathObjectPtr arg; + double val; + + arg = valuePop(ctxt); + if (arg == NULL) + XP_ERROR(XPATH_INVALID_OPERAND); + val = xmlXPathCastToNumber(arg); + xmlXPathReleaseObject(ctxt->context, arg); + CAST_TO_NUMBER; + CHECK_TYPE(XPATH_NUMBER); + ctxt->value->floatval += val; +} + +/** + * xmlXPathSubValues: + * @ctxt: the XPath Parser context + * + * Implement the subtraction operation on XPath objects: + * The numeric operators convert their operands to numbers as if + * by calling the number function. + */ +void +xmlXPathSubValues(xmlXPathParserContextPtr ctxt) { + xmlXPathObjectPtr arg; + double val; + + arg = valuePop(ctxt); + if (arg == NULL) + XP_ERROR(XPATH_INVALID_OPERAND); + val = xmlXPathCastToNumber(arg); + xmlXPathReleaseObject(ctxt->context, arg); + CAST_TO_NUMBER; + CHECK_TYPE(XPATH_NUMBER); + ctxt->value->floatval -= val; +} + +/** + * xmlXPathMultValues: + * @ctxt: the XPath Parser context + * + * Implement the multiply operation on XPath objects: + * The numeric operators convert their operands to numbers as if + * by calling the number function. + */ +void +xmlXPathMultValues(xmlXPathParserContextPtr ctxt) { + xmlXPathObjectPtr arg; + double val; + + arg = valuePop(ctxt); + if (arg == NULL) + XP_ERROR(XPATH_INVALID_OPERAND); + val = xmlXPathCastToNumber(arg); + xmlXPathReleaseObject(ctxt->context, arg); + CAST_TO_NUMBER; + CHECK_TYPE(XPATH_NUMBER); + ctxt->value->floatval *= val; +} + +/** + * xmlXPathDivValues: + * @ctxt: the XPath Parser context + * + * Implement the div operation on XPath objects @arg1 / @arg2: + * The numeric operators convert their operands to numbers as if + * by calling the number function. + */ +void +xmlXPathDivValues(xmlXPathParserContextPtr ctxt) { + xmlXPathObjectPtr arg; + double val; + + arg = valuePop(ctxt); + if (arg == NULL) + XP_ERROR(XPATH_INVALID_OPERAND); + val = xmlXPathCastToNumber(arg); + xmlXPathReleaseObject(ctxt->context, arg); + CAST_TO_NUMBER; + CHECK_TYPE(XPATH_NUMBER); + if (xmlXPathIsNaN(val) || xmlXPathIsNaN(ctxt->value->floatval)) + ctxt->value->floatval = xmlXPathNAN; + else if (val == 0 && xmlXPathGetSign(val) != 0) { + if (ctxt->value->floatval == 0) + ctxt->value->floatval = xmlXPathNAN; + else if (ctxt->value->floatval > 0) + ctxt->value->floatval = xmlXPathNINF; + else if (ctxt->value->floatval < 0) + ctxt->value->floatval = xmlXPathPINF; + } + else if (val == 0) { + if (ctxt->value->floatval == 0) + ctxt->value->floatval = xmlXPathNAN; + else if (ctxt->value->floatval > 0) + ctxt->value->floatval = xmlXPathPINF; + else if (ctxt->value->floatval < 0) + ctxt->value->floatval = xmlXPathNINF; + } else + ctxt->value->floatval /= val; +} + +/** + * xmlXPathModValues: + * @ctxt: the XPath Parser context + * + * Implement the mod operation on XPath objects: @arg1 / @arg2 + * The numeric operators convert their operands to numbers as if + * by calling the number function. + */ +void +xmlXPathModValues(xmlXPathParserContextPtr ctxt) { + xmlXPathObjectPtr arg; + double arg1, arg2; + + arg = valuePop(ctxt); + if (arg == NULL) + XP_ERROR(XPATH_INVALID_OPERAND); + arg2 = xmlXPathCastToNumber(arg); + xmlXPathReleaseObject(ctxt->context, arg); + CAST_TO_NUMBER; + CHECK_TYPE(XPATH_NUMBER); + arg1 = ctxt->value->floatval; + if (arg2 == 0) + ctxt->value->floatval = xmlXPathNAN; + else { + ctxt->value->floatval = fmod(arg1, arg2); + } +} + +/************************************************************************ + * * + * The traversal functions * + * * + ************************************************************************/ + +/* + * A traversal function enumerates nodes along an axis. + * Initially it must be called with NULL, and it indicates + * termination on the axis by returning NULL. + */ +typedef xmlNodePtr (*xmlXPathTraversalFunction) + (xmlXPathParserContextPtr ctxt, xmlNodePtr cur); + +/* + * xmlXPathTraversalFunctionExt: + * A traversal function enumerates nodes along an axis. + * Initially it must be called with NULL, and it indicates + * termination on the axis by returning NULL. + * The context node of the traversal is specified via @contextNode. + */ +typedef xmlNodePtr (*xmlXPathTraversalFunctionExt) + (xmlNodePtr cur, xmlNodePtr contextNode); + +/* + * xmlXPathNodeSetMergeFunction: + * Used for merging node sets in xmlXPathCollectAndTest(). + */ +typedef xmlNodeSetPtr (*xmlXPathNodeSetMergeFunction) + (xmlNodeSetPtr, xmlNodeSetPtr, int); + + +/** + * xmlXPathNextSelf: + * @ctxt: the XPath Parser context + * @cur: the current node in the traversal + * + * Traversal function for the "self" direction + * The self axis contains just the context node itself + * + * Returns the next element following that axis + */ +xmlNodePtr +xmlXPathNextSelf(xmlXPathParserContextPtr ctxt, xmlNodePtr cur) { + if ((ctxt == NULL) || (ctxt->context == NULL)) return(NULL); + if (cur == NULL) + return(ctxt->context->node); + return(NULL); +} + +/** + * xmlXPathNextChild: + * @ctxt: the XPath Parser context + * @cur: the current node in the traversal + * + * Traversal function for the "child" direction + * The child axis contains the children of the context node in document order. + * + * Returns the next element following that axis + */ +xmlNodePtr +xmlXPathNextChild(xmlXPathParserContextPtr ctxt, xmlNodePtr cur) { + if ((ctxt == NULL) || (ctxt->context == NULL)) return(NULL); + if (cur == NULL) { + if (ctxt->context->node == NULL) return(NULL); + switch (ctxt->context->node->type) { + case XML_ELEMENT_NODE: + case XML_TEXT_NODE: + case XML_CDATA_SECTION_NODE: + case XML_ENTITY_REF_NODE: + case XML_ENTITY_NODE: + case XML_PI_NODE: + case XML_COMMENT_NODE: + case XML_NOTATION_NODE: + case XML_DTD_NODE: + return(ctxt->context->node->children); + case XML_DOCUMENT_NODE: + case XML_DOCUMENT_TYPE_NODE: + case XML_DOCUMENT_FRAG_NODE: + case XML_HTML_DOCUMENT_NODE: +#ifdef LIBXML_DOCB_ENABLED + case XML_DOCB_DOCUMENT_NODE: +#endif + return(((xmlDocPtr) ctxt->context->node)->children); + case XML_ELEMENT_DECL: + case XML_ATTRIBUTE_DECL: + case XML_ENTITY_DECL: + case XML_ATTRIBUTE_NODE: + case XML_NAMESPACE_DECL: + case XML_XINCLUDE_START: + case XML_XINCLUDE_END: + return(NULL); + } + return(NULL); + } + if ((cur->type == XML_DOCUMENT_NODE) || + (cur->type == XML_HTML_DOCUMENT_NODE)) + return(NULL); + return(cur->next); +} + +/** + * xmlXPathNextChildElement: + * @ctxt: the XPath Parser context + * @cur: the current node in the traversal + * + * Traversal function for the "child" direction and nodes of type element. + * The child axis contains the children of the context node in document order. + * + * Returns the next element following that axis + */ +static xmlNodePtr +xmlXPathNextChildElement(xmlXPathParserContextPtr ctxt, xmlNodePtr cur) { + if ((ctxt == NULL) || (ctxt->context == NULL)) return(NULL); + if (cur == NULL) { + cur = ctxt->context->node; + if (cur == NULL) return(NULL); + /* + * Get the first element child. + */ + switch (cur->type) { + case XML_ELEMENT_NODE: + case XML_DOCUMENT_FRAG_NODE: + case XML_ENTITY_REF_NODE: /* URGENT TODO: entify-refs as well? */ + case XML_ENTITY_NODE: + cur = cur->children; + if (cur != NULL) { + if (cur->type == XML_ELEMENT_NODE) + return(cur); + do { + cur = cur->next; + } while ((cur != NULL) && + (cur->type != XML_ELEMENT_NODE)); + return(cur); + } + return(NULL); + case XML_DOCUMENT_NODE: + case XML_HTML_DOCUMENT_NODE: +#ifdef LIBXML_DOCB_ENABLED + case XML_DOCB_DOCUMENT_NODE: +#endif + return(xmlDocGetRootElement((xmlDocPtr) cur)); + default: + return(NULL); + } + return(NULL); + } + /* + * Get the next sibling element node. + */ + switch (cur->type) { + case XML_ELEMENT_NODE: + case XML_TEXT_NODE: + case XML_ENTITY_REF_NODE: + case XML_ENTITY_NODE: + case XML_CDATA_SECTION_NODE: + case XML_PI_NODE: + case XML_COMMENT_NODE: + case XML_XINCLUDE_END: + break; + /* case XML_DTD_NODE: */ /* URGENT TODO: DTD-node as well? */ + default: + return(NULL); + } + if (cur->next != NULL) { + if (cur->next->type == XML_ELEMENT_NODE) + return(cur->next); + cur = cur->next; + do { + cur = cur->next; + } while ((cur != NULL) && (cur->type != XML_ELEMENT_NODE)); + return(cur); + } + return(NULL); +} + +#if 0 +/** + * xmlXPathNextDescendantOrSelfElemParent: + * @ctxt: the XPath Parser context + * @cur: the current node in the traversal + * + * Traversal function for the "descendant-or-self" axis. + * Additionally it returns only nodes which can be parents of + * element nodes. + * + * + * Returns the next element following that axis + */ +static xmlNodePtr +xmlXPathNextDescendantOrSelfElemParent(xmlNodePtr cur, + xmlNodePtr contextNode) +{ + if (cur == NULL) { + if (contextNode == NULL) + return(NULL); + switch (contextNode->type) { + case XML_ELEMENT_NODE: + case XML_XINCLUDE_START: + case XML_DOCUMENT_FRAG_NODE: + case XML_DOCUMENT_NODE: +#ifdef LIBXML_DOCB_ENABLED + case XML_DOCB_DOCUMENT_NODE: +#endif + case XML_HTML_DOCUMENT_NODE: + return(contextNode); + default: + return(NULL); + } + return(NULL); + } else { + xmlNodePtr start = cur; + + while (cur != NULL) { + switch (cur->type) { + case XML_ELEMENT_NODE: + /* TODO: OK to have XInclude here? */ + case XML_XINCLUDE_START: + case XML_DOCUMENT_FRAG_NODE: + if (cur != start) + return(cur); + if (cur->children != NULL) { + cur = cur->children; + continue; + } + break; + /* Not sure if we need those here. */ + case XML_DOCUMENT_NODE: +#ifdef LIBXML_DOCB_ENABLED + case XML_DOCB_DOCUMENT_NODE: +#endif + case XML_HTML_DOCUMENT_NODE: + if (cur != start) + return(cur); + return(xmlDocGetRootElement((xmlDocPtr) cur)); + default: + break; + } + +next_sibling: + if ((cur == NULL) || (cur == contextNode)) + return(NULL); + if (cur->next != NULL) { + cur = cur->next; + } else { + cur = cur->parent; + goto next_sibling; + } + } + } + return(NULL); +} +#endif + +/** + * xmlXPathNextDescendant: + * @ctxt: the XPath Parser context + * @cur: the current node in the traversal + * + * Traversal function for the "descendant" direction + * the descendant axis contains the descendants of the context node in document + * order; a descendant is a child or a child of a child and so on. + * + * Returns the next element following that axis + */ +xmlNodePtr +xmlXPathNextDescendant(xmlXPathParserContextPtr ctxt, xmlNodePtr cur) { + if ((ctxt == NULL) || (ctxt->context == NULL)) return(NULL); + if (cur == NULL) { + if (ctxt->context->node == NULL) + return(NULL); + if ((ctxt->context->node->type == XML_ATTRIBUTE_NODE) || + (ctxt->context->node->type == XML_NAMESPACE_DECL)) + return(NULL); + + if (ctxt->context->node == (xmlNodePtr) ctxt->context->doc) + return(ctxt->context->doc->children); + return(ctxt->context->node->children); + } + + if (cur->type == XML_NAMESPACE_DECL) + return(NULL); + if (cur->children != NULL) { + /* + * Do not descend on entities declarations + */ + if (cur->children->type != XML_ENTITY_DECL) { + cur = cur->children; + /* + * Skip DTDs + */ + if (cur->type != XML_DTD_NODE) + return(cur); + } + } + + if (cur == ctxt->context->node) return(NULL); + + while (cur->next != NULL) { + cur = cur->next; + if ((cur->type != XML_ENTITY_DECL) && + (cur->type != XML_DTD_NODE)) + return(cur); + } + + do { + cur = cur->parent; + if (cur == NULL) break; + if (cur == ctxt->context->node) return(NULL); + if (cur->next != NULL) { + cur = cur->next; + return(cur); + } + } while (cur != NULL); + return(cur); +} + +/** + * xmlXPathNextDescendantOrSelf: + * @ctxt: the XPath Parser context + * @cur: the current node in the traversal + * + * Traversal function for the "descendant-or-self" direction + * the descendant-or-self axis contains the context node and the descendants + * of the context node in document order; thus the context node is the first + * node on the axis, and the first child of the context node is the second node + * on the axis + * + * Returns the next element following that axis + */ +xmlNodePtr +xmlXPathNextDescendantOrSelf(xmlXPathParserContextPtr ctxt, xmlNodePtr cur) { + if ((ctxt == NULL) || (ctxt->context == NULL)) return(NULL); + if (cur == NULL) + return(ctxt->context->node); + + if (ctxt->context->node == NULL) + return(NULL); + if ((ctxt->context->node->type == XML_ATTRIBUTE_NODE) || + (ctxt->context->node->type == XML_NAMESPACE_DECL)) + return(NULL); + + return(xmlXPathNextDescendant(ctxt, cur)); +} + +/** + * xmlXPathNextParent: + * @ctxt: the XPath Parser context + * @cur: the current node in the traversal + * + * Traversal function for the "parent" direction + * The parent axis contains the parent of the context node, if there is one. + * + * Returns the next element following that axis + */ +xmlNodePtr +xmlXPathNextParent(xmlXPathParserContextPtr ctxt, xmlNodePtr cur) { + if ((ctxt == NULL) || (ctxt->context == NULL)) return(NULL); + /* + * the parent of an attribute or namespace node is the element + * to which the attribute or namespace node is attached + * Namespace handling !!! + */ + if (cur == NULL) { + if (ctxt->context->node == NULL) return(NULL); + switch (ctxt->context->node->type) { + case XML_ELEMENT_NODE: + case XML_TEXT_NODE: + case XML_CDATA_SECTION_NODE: + case XML_ENTITY_REF_NODE: + case XML_ENTITY_NODE: + case XML_PI_NODE: + case XML_COMMENT_NODE: + case XML_NOTATION_NODE: + case XML_DTD_NODE: + case XML_ELEMENT_DECL: + case XML_ATTRIBUTE_DECL: + case XML_XINCLUDE_START: + case XML_XINCLUDE_END: + case XML_ENTITY_DECL: + if (ctxt->context->node->parent == NULL) + return((xmlNodePtr) ctxt->context->doc); + if ((ctxt->context->node->parent->type == XML_ELEMENT_NODE) && + ((ctxt->context->node->parent->name[0] == ' ') || + (xmlStrEqual(ctxt->context->node->parent->name, + BAD_CAST "fake node libxslt")))) + return(NULL); + return(ctxt->context->node->parent); + case XML_ATTRIBUTE_NODE: { + xmlAttrPtr att = (xmlAttrPtr) ctxt->context->node; + + return(att->parent); + } + case XML_DOCUMENT_NODE: + case XML_DOCUMENT_TYPE_NODE: + case XML_DOCUMENT_FRAG_NODE: + case XML_HTML_DOCUMENT_NODE: +#ifdef LIBXML_DOCB_ENABLED + case XML_DOCB_DOCUMENT_NODE: +#endif + return(NULL); + case XML_NAMESPACE_DECL: { + xmlNsPtr ns = (xmlNsPtr) ctxt->context->node; + + if ((ns->next != NULL) && + (ns->next->type != XML_NAMESPACE_DECL)) + return((xmlNodePtr) ns->next); + return(NULL); + } + } + } + return(NULL); +} + +/** + * xmlXPathNextAncestor: + * @ctxt: the XPath Parser context + * @cur: the current node in the traversal + * + * Traversal function for the "ancestor" direction + * the ancestor axis contains the ancestors of the context node; the ancestors + * of the context node consist of the parent of context node and the parent's + * parent and so on; the nodes are ordered in reverse document order; thus the + * parent is the first node on the axis, and the parent's parent is the second + * node on the axis + * + * Returns the next element following that axis + */ +xmlNodePtr +xmlXPathNextAncestor(xmlXPathParserContextPtr ctxt, xmlNodePtr cur) { + if ((ctxt == NULL) || (ctxt->context == NULL)) return(NULL); + /* + * the parent of an attribute or namespace node is the element + * to which the attribute or namespace node is attached + * !!!!!!!!!!!!! + */ + if (cur == NULL) { + if (ctxt->context->node == NULL) return(NULL); + switch (ctxt->context->node->type) { + case XML_ELEMENT_NODE: + case XML_TEXT_NODE: + case XML_CDATA_SECTION_NODE: + case XML_ENTITY_REF_NODE: + case XML_ENTITY_NODE: + case XML_PI_NODE: + case XML_COMMENT_NODE: + case XML_DTD_NODE: + case XML_ELEMENT_DECL: + case XML_ATTRIBUTE_DECL: + case XML_ENTITY_DECL: + case XML_NOTATION_NODE: + case XML_XINCLUDE_START: + case XML_XINCLUDE_END: + if (ctxt->context->node->parent == NULL) + return((xmlNodePtr) ctxt->context->doc); + if ((ctxt->context->node->parent->type == XML_ELEMENT_NODE) && + ((ctxt->context->node->parent->name[0] == ' ') || + (xmlStrEqual(ctxt->context->node->parent->name, + BAD_CAST "fake node libxslt")))) + return(NULL); + return(ctxt->context->node->parent); + case XML_ATTRIBUTE_NODE: { + xmlAttrPtr tmp = (xmlAttrPtr) ctxt->context->node; + + return(tmp->parent); + } + case XML_DOCUMENT_NODE: + case XML_DOCUMENT_TYPE_NODE: + case XML_DOCUMENT_FRAG_NODE: + case XML_HTML_DOCUMENT_NODE: +#ifdef LIBXML_DOCB_ENABLED + case XML_DOCB_DOCUMENT_NODE: +#endif + return(NULL); + case XML_NAMESPACE_DECL: { + xmlNsPtr ns = (xmlNsPtr) ctxt->context->node; + + if ((ns->next != NULL) && + (ns->next->type != XML_NAMESPACE_DECL)) + return((xmlNodePtr) ns->next); + /* Bad, how did that namespace end up here ? */ + return(NULL); + } + } + return(NULL); + } + if (cur == ctxt->context->doc->children) + return((xmlNodePtr) ctxt->context->doc); + if (cur == (xmlNodePtr) ctxt->context->doc) + return(NULL); + switch (cur->type) { + case XML_ELEMENT_NODE: + case XML_TEXT_NODE: + case XML_CDATA_SECTION_NODE: + case XML_ENTITY_REF_NODE: + case XML_ENTITY_NODE: + case XML_PI_NODE: + case XML_COMMENT_NODE: + case XML_NOTATION_NODE: + case XML_DTD_NODE: + case XML_ELEMENT_DECL: + case XML_ATTRIBUTE_DECL: + case XML_ENTITY_DECL: + case XML_XINCLUDE_START: + case XML_XINCLUDE_END: + if (cur->parent == NULL) + return(NULL); + if ((cur->parent->type == XML_ELEMENT_NODE) && + ((cur->parent->name[0] == ' ') || + (xmlStrEqual(cur->parent->name, + BAD_CAST "fake node libxslt")))) + return(NULL); + return(cur->parent); + case XML_ATTRIBUTE_NODE: { + xmlAttrPtr att = (xmlAttrPtr) ctxt->context->node; + + return(att->parent); + } + case XML_NAMESPACE_DECL: { + xmlNsPtr ns = (xmlNsPtr) ctxt->context->node; + + if ((ns->next != NULL) && + (ns->next->type != XML_NAMESPACE_DECL)) + return((xmlNodePtr) ns->next); + /* Bad, how did that namespace end up here ? */ + return(NULL); + } + case XML_DOCUMENT_NODE: + case XML_DOCUMENT_TYPE_NODE: + case XML_DOCUMENT_FRAG_NODE: + case XML_HTML_DOCUMENT_NODE: +#ifdef LIBXML_DOCB_ENABLED + case XML_DOCB_DOCUMENT_NODE: +#endif + return(NULL); + } + return(NULL); +} + +/** + * xmlXPathNextAncestorOrSelf: + * @ctxt: the XPath Parser context + * @cur: the current node in the traversal + * + * Traversal function for the "ancestor-or-self" direction + * he ancestor-or-self axis contains the context node and ancestors of + * the context node in reverse document order; thus the context node is + * the first node on the axis, and the context node's parent the second; + * parent here is defined the same as with the parent axis. + * + * Returns the next element following that axis + */ +xmlNodePtr +xmlXPathNextAncestorOrSelf(xmlXPathParserContextPtr ctxt, xmlNodePtr cur) { + if ((ctxt == NULL) || (ctxt->context == NULL)) return(NULL); + if (cur == NULL) + return(ctxt->context->node); + return(xmlXPathNextAncestor(ctxt, cur)); +} + +/** + * xmlXPathNextFollowingSibling: + * @ctxt: the XPath Parser context + * @cur: the current node in the traversal + * + * Traversal function for the "following-sibling" direction + * The following-sibling axis contains the following siblings of the context + * node in document order. + * + * Returns the next element following that axis + */ +xmlNodePtr +xmlXPathNextFollowingSibling(xmlXPathParserContextPtr ctxt, xmlNodePtr cur) { + if ((ctxt == NULL) || (ctxt->context == NULL)) return(NULL); + if ((ctxt->context->node->type == XML_ATTRIBUTE_NODE) || + (ctxt->context->node->type == XML_NAMESPACE_DECL)) + return(NULL); + if (cur == (xmlNodePtr) ctxt->context->doc) + return(NULL); + if (cur == NULL) + return(ctxt->context->node->next); + return(cur->next); +} + +/** + * xmlXPathNextPrecedingSibling: + * @ctxt: the XPath Parser context + * @cur: the current node in the traversal + * + * Traversal function for the "preceding-sibling" direction + * The preceding-sibling axis contains the preceding siblings of the context + * node in reverse document order; the first preceding sibling is first on the + * axis; the sibling preceding that node is the second on the axis and so on. + * + * Returns the next element following that axis + */ +xmlNodePtr +xmlXPathNextPrecedingSibling(xmlXPathParserContextPtr ctxt, xmlNodePtr cur) { + if ((ctxt == NULL) || (ctxt->context == NULL)) return(NULL); + if ((ctxt->context->node->type == XML_ATTRIBUTE_NODE) || + (ctxt->context->node->type == XML_NAMESPACE_DECL)) + return(NULL); + if (cur == (xmlNodePtr) ctxt->context->doc) + return(NULL); + if (cur == NULL) + return(ctxt->context->node->prev); + if ((cur->prev != NULL) && (cur->prev->type == XML_DTD_NODE)) { + cur = cur->prev; + if (cur == NULL) + return(ctxt->context->node->prev); + } + return(cur->prev); +} + +/** + * xmlXPathNextFollowing: + * @ctxt: the XPath Parser context + * @cur: the current node in the traversal + * + * Traversal function for the "following" direction + * The following axis contains all nodes in the same document as the context + * node that are after the context node in document order, excluding any + * descendants and excluding attribute nodes and namespace nodes; the nodes + * are ordered in document order + * + * Returns the next element following that axis + */ +xmlNodePtr +xmlXPathNextFollowing(xmlXPathParserContextPtr ctxt, xmlNodePtr cur) { + if ((ctxt == NULL) || (ctxt->context == NULL)) return(NULL); + if ((cur != NULL) && (cur->type != XML_ATTRIBUTE_NODE) && + (cur->type != XML_NAMESPACE_DECL) && (cur->children != NULL)) + return(cur->children); + + if (cur == NULL) { + cur = ctxt->context->node; + if (cur->type == XML_NAMESPACE_DECL) + return(NULL); + if (cur->type == XML_ATTRIBUTE_NODE) + cur = cur->parent; + } + if (cur == NULL) return(NULL) ; /* ERROR */ + if (cur->next != NULL) return(cur->next) ; + do { + cur = cur->parent; + if (cur == NULL) break; + if (cur == (xmlNodePtr) ctxt->context->doc) return(NULL); + if (cur->next != NULL) return(cur->next); + } while (cur != NULL); + return(cur); +} + +/* + * xmlXPathIsAncestor: + * @ancestor: the ancestor node + * @node: the current node + * + * Check that @ancestor is a @node's ancestor + * + * returns 1 if @ancestor is a @node's ancestor, 0 otherwise. + */ +static int +xmlXPathIsAncestor(xmlNodePtr ancestor, xmlNodePtr node) { + if ((ancestor == NULL) || (node == NULL)) return(0); + if (node->type == XML_NAMESPACE_DECL) + return(0); + if (ancestor->type == XML_NAMESPACE_DECL) + return(0); + /* nodes need to be in the same document */ + if (ancestor->doc != node->doc) return(0); + /* avoid searching if ancestor or node is the root node */ + if (ancestor == (xmlNodePtr) node->doc) return(1); + if (node == (xmlNodePtr) ancestor->doc) return(0); + while (node->parent != NULL) { + if (node->parent == ancestor) + return(1); + node = node->parent; + } + return(0); +} + +/** + * xmlXPathNextPreceding: + * @ctxt: the XPath Parser context + * @cur: the current node in the traversal + * + * Traversal function for the "preceding" direction + * the preceding axis contains all nodes in the same document as the context + * node that are before the context node in document order, excluding any + * ancestors and excluding attribute nodes and namespace nodes; the nodes are + * ordered in reverse document order + * + * Returns the next element following that axis + */ +xmlNodePtr +xmlXPathNextPreceding(xmlXPathParserContextPtr ctxt, xmlNodePtr cur) +{ + if ((ctxt == NULL) || (ctxt->context == NULL)) return(NULL); + if (cur == NULL) { + cur = ctxt->context->node; + if (cur->type == XML_NAMESPACE_DECL) + return(NULL); + if (cur->type == XML_ATTRIBUTE_NODE) + return(cur->parent); + } + if ((cur == NULL) || (cur->type == XML_NAMESPACE_DECL)) + return (NULL); + if ((cur->prev != NULL) && (cur->prev->type == XML_DTD_NODE)) + cur = cur->prev; + do { + if (cur->prev != NULL) { + for (cur = cur->prev; cur->last != NULL; cur = cur->last) ; + return (cur); + } + + cur = cur->parent; + if (cur == NULL) + return (NULL); + if (cur == ctxt->context->doc->children) + return (NULL); + } while (xmlXPathIsAncestor(cur, ctxt->context->node)); + return (cur); +} + +/** + * xmlXPathNextPrecedingInternal: + * @ctxt: the XPath Parser context + * @cur: the current node in the traversal + * + * Traversal function for the "preceding" direction + * the preceding axis contains all nodes in the same document as the context + * node that are before the context node in document order, excluding any + * ancestors and excluding attribute nodes and namespace nodes; the nodes are + * ordered in reverse document order + * This is a faster implementation but internal only since it requires a + * state kept in the parser context: ctxt->ancestor. + * + * Returns the next element following that axis + */ +static xmlNodePtr +xmlXPathNextPrecedingInternal(xmlXPathParserContextPtr ctxt, + xmlNodePtr cur) +{ + if ((ctxt == NULL) || (ctxt->context == NULL)) return(NULL); + if (cur == NULL) { + cur = ctxt->context->node; + if (cur == NULL) + return (NULL); + if (cur->type == XML_NAMESPACE_DECL) + return (NULL); + ctxt->ancestor = cur->parent; + } + if (cur->type == XML_NAMESPACE_DECL) + return(NULL); + if ((cur->prev != NULL) && (cur->prev->type == XML_DTD_NODE)) + cur = cur->prev; + while (cur->prev == NULL) { + cur = cur->parent; + if (cur == NULL) + return (NULL); + if (cur == ctxt->context->doc->children) + return (NULL); + if (cur != ctxt->ancestor) + return (cur); + ctxt->ancestor = cur->parent; + } + cur = cur->prev; + while (cur->last != NULL) + cur = cur->last; + return (cur); +} + +/** + * xmlXPathNextNamespace: + * @ctxt: the XPath Parser context + * @cur: the current attribute in the traversal + * + * Traversal function for the "namespace" direction + * the namespace axis contains the namespace nodes of the context node; + * the order of nodes on this axis is implementation-defined; the axis will + * be empty unless the context node is an element + * + * We keep the XML namespace node at the end of the list. + * + * Returns the next element following that axis + */ +xmlNodePtr +xmlXPathNextNamespace(xmlXPathParserContextPtr ctxt, xmlNodePtr cur) { + if ((ctxt == NULL) || (ctxt->context == NULL)) return(NULL); + if (ctxt->context->node->type != XML_ELEMENT_NODE) return(NULL); + if (cur == NULL) { + if (ctxt->context->tmpNsList != NULL) + xmlFree(ctxt->context->tmpNsList); + ctxt->context->tmpNsList = + xmlGetNsList(ctxt->context->doc, ctxt->context->node); + ctxt->context->tmpNsNr = 0; + if (ctxt->context->tmpNsList != NULL) { + while (ctxt->context->tmpNsList[ctxt->context->tmpNsNr] != NULL) { + ctxt->context->tmpNsNr++; + } + } + return((xmlNodePtr) xmlXPathXMLNamespace); + } + if (ctxt->context->tmpNsNr > 0) { + return (xmlNodePtr)ctxt->context->tmpNsList[--ctxt->context->tmpNsNr]; + } else { + if (ctxt->context->tmpNsList != NULL) + xmlFree(ctxt->context->tmpNsList); + ctxt->context->tmpNsList = NULL; + return(NULL); + } +} + +/** + * xmlXPathNextAttribute: + * @ctxt: the XPath Parser context + * @cur: the current attribute in the traversal + * + * Traversal function for the "attribute" direction + * TODO: support DTD inherited default attributes + * + * Returns the next element following that axis + */ +xmlNodePtr +xmlXPathNextAttribute(xmlXPathParserContextPtr ctxt, xmlNodePtr cur) { + if ((ctxt == NULL) || (ctxt->context == NULL)) return(NULL); + if (ctxt->context->node == NULL) + return(NULL); + if (ctxt->context->node->type != XML_ELEMENT_NODE) + return(NULL); + if (cur == NULL) { + if (ctxt->context->node == (xmlNodePtr) ctxt->context->doc) + return(NULL); + return((xmlNodePtr)ctxt->context->node->properties); + } + return((xmlNodePtr)cur->next); +} + +/************************************************************************ + * * + * NodeTest Functions * + * * + ************************************************************************/ + +#define IS_FUNCTION 200 + + +/************************************************************************ + * * + * Implicit tree core function library * + * * + ************************************************************************/ + +/** + * xmlXPathRoot: + * @ctxt: the XPath Parser context + * + * Initialize the context to the root of the document + */ +void +xmlXPathRoot(xmlXPathParserContextPtr ctxt) { + if ((ctxt == NULL) || (ctxt->context == NULL)) + return; + ctxt->context->node = (xmlNodePtr) ctxt->context->doc; + valuePush(ctxt, xmlXPathCacheNewNodeSet(ctxt->context, + ctxt->context->node)); +} + +/************************************************************************ + * * + * The explicit core function library * + *http://www.w3.org/Style/XSL/Group/1999/07/xpath-19990705.html#corelib * + * * + ************************************************************************/ + + +/** + * xmlXPathLastFunction: + * @ctxt: the XPath Parser context + * @nargs: the number of arguments + * + * Implement the last() XPath function + * number last() + * The last function returns the number of nodes in the context node list. + */ +void +xmlXPathLastFunction(xmlXPathParserContextPtr ctxt, int nargs) { + CHECK_ARITY(0); + if (ctxt->context->contextSize >= 0) { + valuePush(ctxt, + xmlXPathCacheNewFloat(ctxt->context, + (double) ctxt->context->contextSize)); +#ifdef DEBUG_EXPR + xmlGenericError(xmlGenericErrorContext, + "last() : %d\n", ctxt->context->contextSize); +#endif + } else { + XP_ERROR(XPATH_INVALID_CTXT_SIZE); + } +} + +/** + * xmlXPathPositionFunction: + * @ctxt: the XPath Parser context + * @nargs: the number of arguments + * + * Implement the position() XPath function + * number position() + * The position function returns the position of the context node in the + * context node list. The first position is 1, and so the last position + * will be equal to last(). + */ +void +xmlXPathPositionFunction(xmlXPathParserContextPtr ctxt, int nargs) { + CHECK_ARITY(0); + if (ctxt->context->proximityPosition >= 0) { + valuePush(ctxt, + xmlXPathCacheNewFloat(ctxt->context, + (double) ctxt->context->proximityPosition)); +#ifdef DEBUG_EXPR + xmlGenericError(xmlGenericErrorContext, "position() : %d\n", + ctxt->context->proximityPosition); +#endif + } else { + XP_ERROR(XPATH_INVALID_CTXT_POSITION); + } +} + +/** + * xmlXPathCountFunction: + * @ctxt: the XPath Parser context + * @nargs: the number of arguments + * + * Implement the count() XPath function + * number count(node-set) + */ +void +xmlXPathCountFunction(xmlXPathParserContextPtr ctxt, int nargs) { + xmlXPathObjectPtr cur; + + CHECK_ARITY(1); + if ((ctxt->value == NULL) || + ((ctxt->value->type != XPATH_NODESET) && + (ctxt->value->type != XPATH_XSLT_TREE))) + XP_ERROR(XPATH_INVALID_TYPE); + cur = valuePop(ctxt); + + if ((cur == NULL) || (cur->nodesetval == NULL)) + valuePush(ctxt, xmlXPathCacheNewFloat(ctxt->context, (double) 0)); + else if ((cur->type == XPATH_NODESET) || (cur->type == XPATH_XSLT_TREE)) { + valuePush(ctxt, xmlXPathCacheNewFloat(ctxt->context, + (double) cur->nodesetval->nodeNr)); + } else { + if ((cur->nodesetval->nodeNr != 1) || + (cur->nodesetval->nodeTab == NULL)) { + valuePush(ctxt, xmlXPathCacheNewFloat(ctxt->context, (double) 0)); + } else { + xmlNodePtr tmp; + int i = 0; + + tmp = cur->nodesetval->nodeTab[0]; + if ((tmp != NULL) && (tmp->type != XML_NAMESPACE_DECL)) { + tmp = tmp->children; + while (tmp != NULL) { + tmp = tmp->next; + i++; + } + } + valuePush(ctxt, xmlXPathCacheNewFloat(ctxt->context, (double) i)); + } + } + xmlXPathReleaseObject(ctxt->context, cur); +} + +/** + * xmlXPathGetElementsByIds: + * @doc: the document + * @ids: a whitespace separated list of IDs + * + * Selects elements by their unique ID. + * + * Returns a node-set of selected elements. + */ +static xmlNodeSetPtr +xmlXPathGetElementsByIds (xmlDocPtr doc, const xmlChar *ids) { + xmlNodeSetPtr ret; + const xmlChar *cur = ids; + xmlChar *ID; + xmlAttrPtr attr; + xmlNodePtr elem = NULL; + + if (ids == NULL) return(NULL); + + ret = xmlXPathNodeSetCreate(NULL); + if (ret == NULL) + return(ret); + + while (IS_BLANK_CH(*cur)) cur++; + while (*cur != 0) { + while ((!IS_BLANK_CH(*cur)) && (*cur != 0)) + cur++; + + ID = xmlStrndup(ids, cur - ids); + if (ID != NULL) { + /* + * We used to check the fact that the value passed + * was an NCName, but this generated much troubles for + * me and Aleksey Sanin, people blatantly violated that + * constaint, like Visa3D spec. + * if (xmlValidateNCName(ID, 1) == 0) + */ + attr = xmlGetID(doc, ID); + if (attr != NULL) { + if (attr->type == XML_ATTRIBUTE_NODE) + elem = attr->parent; + else if (attr->type == XML_ELEMENT_NODE) + elem = (xmlNodePtr) attr; + else + elem = NULL; + if (elem != NULL) + xmlXPathNodeSetAdd(ret, elem); + } + xmlFree(ID); + } + + while (IS_BLANK_CH(*cur)) cur++; + ids = cur; + } + return(ret); +} + +/** + * xmlXPathIdFunction: + * @ctxt: the XPath Parser context + * @nargs: the number of arguments + * + * Implement the id() XPath function + * node-set id(object) + * The id function selects elements by their unique ID + * (see [5.2.1 Unique IDs]). When the argument to id is of type node-set, + * then the result is the union of the result of applying id to the + * string value of each of the nodes in the argument node-set. When the + * argument to id is of any other type, the argument is converted to a + * string as if by a call to the string function; the string is split + * into a whitespace-separated list of tokens (whitespace is any sequence + * of characters matching the production S); the result is a node-set + * containing the elements in the same document as the context node that + * have a unique ID equal to any of the tokens in the list. + */ +void +xmlXPathIdFunction(xmlXPathParserContextPtr ctxt, int nargs) { + xmlChar *tokens; + xmlNodeSetPtr ret; + xmlXPathObjectPtr obj; + + CHECK_ARITY(1); + obj = valuePop(ctxt); + if (obj == NULL) XP_ERROR(XPATH_INVALID_OPERAND); + if ((obj->type == XPATH_NODESET) || (obj->type == XPATH_XSLT_TREE)) { + xmlNodeSetPtr ns; + int i; + + ret = xmlXPathNodeSetCreate(NULL); + /* + * FIXME -- in an out-of-memory condition this will behave badly. + * The solution is not clear -- we already popped an item from + * ctxt, so the object is in a corrupt state. + */ + + if (obj->nodesetval != NULL) { + for (i = 0; i < obj->nodesetval->nodeNr; i++) { + tokens = + xmlXPathCastNodeToString(obj->nodesetval->nodeTab[i]); + ns = xmlXPathGetElementsByIds(ctxt->context->doc, tokens); + ret = xmlXPathNodeSetMerge(ret, ns); + xmlXPathFreeNodeSet(ns); + if (tokens != NULL) + xmlFree(tokens); + } + } + xmlXPathReleaseObject(ctxt->context, obj); + valuePush(ctxt, xmlXPathCacheWrapNodeSet(ctxt->context, ret)); + return; + } + obj = xmlXPathCacheConvertString(ctxt->context, obj); + ret = xmlXPathGetElementsByIds(ctxt->context->doc, obj->stringval); + valuePush(ctxt, xmlXPathCacheWrapNodeSet(ctxt->context, ret)); + xmlXPathReleaseObject(ctxt->context, obj); + return; +} + +/** + * xmlXPathLocalNameFunction: + * @ctxt: the XPath Parser context + * @nargs: the number of arguments + * + * Implement the local-name() XPath function + * string local-name(node-set?) + * The local-name function returns a string containing the local part + * of the name of the node in the argument node-set that is first in + * document order. If the node-set is empty or the first node has no + * name, an empty string is returned. If the argument is omitted it + * defaults to the context node. + */ +void +xmlXPathLocalNameFunction(xmlXPathParserContextPtr ctxt, int nargs) { + xmlXPathObjectPtr cur; + + if (ctxt == NULL) return; + + if (nargs == 0) { + valuePush(ctxt, xmlXPathCacheNewNodeSet(ctxt->context, + ctxt->context->node)); + nargs = 1; + } + + CHECK_ARITY(1); + if ((ctxt->value == NULL) || + ((ctxt->value->type != XPATH_NODESET) && + (ctxt->value->type != XPATH_XSLT_TREE))) + XP_ERROR(XPATH_INVALID_TYPE); + cur = valuePop(ctxt); + + if ((cur->nodesetval == NULL) || (cur->nodesetval->nodeNr == 0)) { + valuePush(ctxt, xmlXPathCacheNewCString(ctxt->context, "")); + } else { + int i = 0; /* Should be first in document order !!!!! */ + switch (cur->nodesetval->nodeTab[i]->type) { + case XML_ELEMENT_NODE: + case XML_ATTRIBUTE_NODE: + case XML_PI_NODE: + if (cur->nodesetval->nodeTab[i]->name[0] == ' ') + valuePush(ctxt, xmlXPathCacheNewCString(ctxt->context, "")); + else + valuePush(ctxt, + xmlXPathCacheNewString(ctxt->context, + cur->nodesetval->nodeTab[i]->name)); + break; + case XML_NAMESPACE_DECL: + valuePush(ctxt, xmlXPathCacheNewString(ctxt->context, + ((xmlNsPtr)cur->nodesetval->nodeTab[i])->prefix)); + break; + default: + valuePush(ctxt, xmlXPathCacheNewCString(ctxt->context, "")); + } + } + xmlXPathReleaseObject(ctxt->context, cur); +} + +/** + * xmlXPathNamespaceURIFunction: + * @ctxt: the XPath Parser context + * @nargs: the number of arguments + * + * Implement the namespace-uri() XPath function + * string namespace-uri(node-set?) + * The namespace-uri function returns a string containing the + * namespace URI of the expanded name of the node in the argument + * node-set that is first in document order. If the node-set is empty, + * the first node has no name, or the expanded name has no namespace + * URI, an empty string is returned. If the argument is omitted it + * defaults to the context node. + */ +void +xmlXPathNamespaceURIFunction(xmlXPathParserContextPtr ctxt, int nargs) { + xmlXPathObjectPtr cur; + + if (ctxt == NULL) return; + + if (nargs == 0) { + valuePush(ctxt, xmlXPathCacheNewNodeSet(ctxt->context, + ctxt->context->node)); + nargs = 1; + } + CHECK_ARITY(1); + if ((ctxt->value == NULL) || + ((ctxt->value->type != XPATH_NODESET) && + (ctxt->value->type != XPATH_XSLT_TREE))) + XP_ERROR(XPATH_INVALID_TYPE); + cur = valuePop(ctxt); + + if ((cur->nodesetval == NULL) || (cur->nodesetval->nodeNr == 0)) { + valuePush(ctxt, xmlXPathCacheNewCString(ctxt->context, "")); + } else { + int i = 0; /* Should be first in document order !!!!! */ + switch (cur->nodesetval->nodeTab[i]->type) { + case XML_ELEMENT_NODE: + case XML_ATTRIBUTE_NODE: + if (cur->nodesetval->nodeTab[i]->ns == NULL) + valuePush(ctxt, xmlXPathCacheNewCString(ctxt->context, "")); + else + valuePush(ctxt, xmlXPathCacheNewString(ctxt->context, + cur->nodesetval->nodeTab[i]->ns->href)); + break; + default: + valuePush(ctxt, xmlXPathCacheNewCString(ctxt->context, "")); + } + } + xmlXPathReleaseObject(ctxt->context, cur); +} + +/** + * xmlXPathNameFunction: + * @ctxt: the XPath Parser context + * @nargs: the number of arguments + * + * Implement the name() XPath function + * string name(node-set?) + * The name function returns a string containing a QName representing + * the name of the node in the argument node-set that is first in document + * order. The QName must represent the name with respect to the namespace + * declarations in effect on the node whose name is being represented. + * Typically, this will be the form in which the name occurred in the XML + * source. This need not be the case if there are namespace declarations + * in effect on the node that associate multiple prefixes with the same + * namespace. However, an implementation may include information about + * the original prefix in its representation of nodes; in this case, an + * implementation can ensure that the returned string is always the same + * as the QName used in the XML source. If the argument it omitted it + * defaults to the context node. + * Libxml keep the original prefix so the "real qualified name" used is + * returned. + */ +static void +xmlXPathNameFunction(xmlXPathParserContextPtr ctxt, int nargs) +{ + xmlXPathObjectPtr cur; + + if (nargs == 0) { + valuePush(ctxt, xmlXPathCacheNewNodeSet(ctxt->context, + ctxt->context->node)); + nargs = 1; + } + + CHECK_ARITY(1); + if ((ctxt->value == NULL) || + ((ctxt->value->type != XPATH_NODESET) && + (ctxt->value->type != XPATH_XSLT_TREE))) + XP_ERROR(XPATH_INVALID_TYPE); + cur = valuePop(ctxt); + + if ((cur->nodesetval == NULL) || (cur->nodesetval->nodeNr == 0)) { + valuePush(ctxt, xmlXPathCacheNewCString(ctxt->context, "")); + } else { + int i = 0; /* Should be first in document order !!!!! */ + + switch (cur->nodesetval->nodeTab[i]->type) { + case XML_ELEMENT_NODE: + case XML_ATTRIBUTE_NODE: + if (cur->nodesetval->nodeTab[i]->name[0] == ' ') + valuePush(ctxt, + xmlXPathCacheNewCString(ctxt->context, "")); + else if ((cur->nodesetval->nodeTab[i]->ns == NULL) || + (cur->nodesetval->nodeTab[i]->ns->prefix == NULL)) { + valuePush(ctxt, + xmlXPathCacheNewString(ctxt->context, + cur->nodesetval->nodeTab[i]->name)); + } else { + xmlChar *fullname; + + fullname = xmlBuildQName(cur->nodesetval->nodeTab[i]->name, + cur->nodesetval->nodeTab[i]->ns->prefix, + NULL, 0); + if (fullname == cur->nodesetval->nodeTab[i]->name) + fullname = xmlStrdup(cur->nodesetval->nodeTab[i]->name); + if (fullname == NULL) { + XP_ERROR(XPATH_MEMORY_ERROR); + } + valuePush(ctxt, xmlXPathCacheWrapString( + ctxt->context, fullname)); + } + break; + default: + valuePush(ctxt, xmlXPathCacheNewNodeSet(ctxt->context, + cur->nodesetval->nodeTab[i])); + xmlXPathLocalNameFunction(ctxt, 1); + } + } + xmlXPathReleaseObject(ctxt->context, cur); +} + + +/** + * xmlXPathStringFunction: + * @ctxt: the XPath Parser context + * @nargs: the number of arguments + * + * Implement the string() XPath function + * string string(object?) + * The string function converts an object to a string as follows: + * - A node-set is converted to a string by returning the value of + * the node in the node-set that is first in document order. + * If the node-set is empty, an empty string is returned. + * - A number is converted to a string as follows + * + NaN is converted to the string NaN + * + positive zero is converted to the string 0 + * + negative zero is converted to the string 0 + * + positive infinity is converted to the string Infinity + * + negative infinity is converted to the string -Infinity + * + if the number is an integer, the number is represented in + * decimal form as a Number with no decimal point and no leading + * zeros, preceded by a minus sign (-) if the number is negative + * + otherwise, the number is represented in decimal form as a + * Number including a decimal point with at least one digit + * before the decimal point and at least one digit after the + * decimal point, preceded by a minus sign (-) if the number + * is negative; there must be no leading zeros before the decimal + * point apart possibly from the one required digit immediately + * before the decimal point; beyond the one required digit + * after the decimal point there must be as many, but only as + * many, more digits as are needed to uniquely distinguish the + * number from all other IEEE 754 numeric values. + * - The boolean false value is converted to the string false. + * The boolean true value is converted to the string true. + * + * If the argument is omitted, it defaults to a node-set with the + * context node as its only member. + */ +void +xmlXPathStringFunction(xmlXPathParserContextPtr ctxt, int nargs) { + xmlXPathObjectPtr cur; + + if (ctxt == NULL) return; + if (nargs == 0) { + valuePush(ctxt, + xmlXPathCacheWrapString(ctxt->context, + xmlXPathCastNodeToString(ctxt->context->node))); + return; + } + + CHECK_ARITY(1); + cur = valuePop(ctxt); + if (cur == NULL) XP_ERROR(XPATH_INVALID_OPERAND); + valuePush(ctxt, xmlXPathCacheConvertString(ctxt->context, cur)); +} + +/** + * xmlXPathStringLengthFunction: + * @ctxt: the XPath Parser context + * @nargs: the number of arguments + * + * Implement the string-length() XPath function + * number string-length(string?) + * The string-length returns the number of characters in the string + * (see [3.6 Strings]). If the argument is omitted, it defaults to + * the context node converted to a string, in other words the value + * of the context node. + */ +void +xmlXPathStringLengthFunction(xmlXPathParserContextPtr ctxt, int nargs) { + xmlXPathObjectPtr cur; + + if (nargs == 0) { + if ((ctxt == NULL) || (ctxt->context == NULL)) + return; + if (ctxt->context->node == NULL) { + valuePush(ctxt, xmlXPathCacheNewFloat(ctxt->context, 0)); + } else { + xmlChar *content; + + content = xmlXPathCastNodeToString(ctxt->context->node); + valuePush(ctxt, xmlXPathCacheNewFloat(ctxt->context, + xmlUTF8Strlen(content))); + xmlFree(content); + } + return; + } + CHECK_ARITY(1); + CAST_TO_STRING; + CHECK_TYPE(XPATH_STRING); + cur = valuePop(ctxt); + valuePush(ctxt, xmlXPathCacheNewFloat(ctxt->context, + xmlUTF8Strlen(cur->stringval))); + xmlXPathReleaseObject(ctxt->context, cur); +} + +/** + * xmlXPathConcatFunction: + * @ctxt: the XPath Parser context + * @nargs: the number of arguments + * + * Implement the concat() XPath function + * string concat(string, string, string*) + * The concat function returns the concatenation of its arguments. + */ +void +xmlXPathConcatFunction(xmlXPathParserContextPtr ctxt, int nargs) { + xmlXPathObjectPtr cur, newobj; + xmlChar *tmp; + + if (ctxt == NULL) return; + if (nargs < 2) { + CHECK_ARITY(2); + } + + CAST_TO_STRING; + cur = valuePop(ctxt); + if ((cur == NULL) || (cur->type != XPATH_STRING)) { + xmlXPathReleaseObject(ctxt->context, cur); + return; + } + nargs--; + + while (nargs > 0) { + CAST_TO_STRING; + newobj = valuePop(ctxt); + if ((newobj == NULL) || (newobj->type != XPATH_STRING)) { + xmlXPathReleaseObject(ctxt->context, newobj); + xmlXPathReleaseObject(ctxt->context, cur); + XP_ERROR(XPATH_INVALID_TYPE); + } + tmp = xmlStrcat(newobj->stringval, cur->stringval); + newobj->stringval = cur->stringval; + cur->stringval = tmp; + xmlXPathReleaseObject(ctxt->context, newobj); + nargs--; + } + valuePush(ctxt, cur); +} + +/** + * xmlXPathContainsFunction: + * @ctxt: the XPath Parser context + * @nargs: the number of arguments + * + * Implement the contains() XPath function + * boolean contains(string, string) + * The contains function returns true if the first argument string + * contains the second argument string, and otherwise returns false. + */ +void +xmlXPathContainsFunction(xmlXPathParserContextPtr ctxt, int nargs) { + xmlXPathObjectPtr hay, needle; + + CHECK_ARITY(2); + CAST_TO_STRING; + CHECK_TYPE(XPATH_STRING); + needle = valuePop(ctxt); + CAST_TO_STRING; + hay = valuePop(ctxt); + + if ((hay == NULL) || (hay->type != XPATH_STRING)) { + xmlXPathReleaseObject(ctxt->context, hay); + xmlXPathReleaseObject(ctxt->context, needle); + XP_ERROR(XPATH_INVALID_TYPE); + } + if (xmlStrstr(hay->stringval, needle->stringval)) + valuePush(ctxt, xmlXPathCacheNewBoolean(ctxt->context, 1)); + else + valuePush(ctxt, xmlXPathCacheNewBoolean(ctxt->context, 0)); + xmlXPathReleaseObject(ctxt->context, hay); + xmlXPathReleaseObject(ctxt->context, needle); +} + +/** + * xmlXPathStartsWithFunction: + * @ctxt: the XPath Parser context + * @nargs: the number of arguments + * + * Implement the starts-with() XPath function + * boolean starts-with(string, string) + * The starts-with function returns true if the first argument string + * starts with the second argument string, and otherwise returns false. + */ +void +xmlXPathStartsWithFunction(xmlXPathParserContextPtr ctxt, int nargs) { + xmlXPathObjectPtr hay, needle; + int n; + + CHECK_ARITY(2); + CAST_TO_STRING; + CHECK_TYPE(XPATH_STRING); + needle = valuePop(ctxt); + CAST_TO_STRING; + hay = valuePop(ctxt); + + if ((hay == NULL) || (hay->type != XPATH_STRING)) { + xmlXPathReleaseObject(ctxt->context, hay); + xmlXPathReleaseObject(ctxt->context, needle); + XP_ERROR(XPATH_INVALID_TYPE); + } + n = xmlStrlen(needle->stringval); + if (xmlStrncmp(hay->stringval, needle->stringval, n)) + valuePush(ctxt, xmlXPathCacheNewBoolean(ctxt->context, 0)); + else + valuePush(ctxt, xmlXPathCacheNewBoolean(ctxt->context, 1)); + xmlXPathReleaseObject(ctxt->context, hay); + xmlXPathReleaseObject(ctxt->context, needle); +} + +/** + * xmlXPathSubstringFunction: + * @ctxt: the XPath Parser context + * @nargs: the number of arguments + * + * Implement the substring() XPath function + * string substring(string, number, number?) + * The substring function returns the substring of the first argument + * starting at the position specified in the second argument with + * length specified in the third argument. For example, + * substring("12345",2,3) returns "234". If the third argument is not + * specified, it returns the substring starting at the position specified + * in the second argument and continuing to the end of the string. For + * example, substring("12345",2) returns "2345". More precisely, each + * character in the string (see [3.6 Strings]) is considered to have a + * numeric position: the position of the first character is 1, the position + * of the second character is 2 and so on. The returned substring contains + * those characters for which the position of the character is greater than + * or equal to the second argument and, if the third argument is specified, + * less than the sum of the second and third arguments; the comparisons + * and addition used for the above follow the standard IEEE 754 rules. Thus: + * - substring("12345", 1.5, 2.6) returns "234" + * - substring("12345", 0, 3) returns "12" + * - substring("12345", 0 div 0, 3) returns "" + * - substring("12345", 1, 0 div 0) returns "" + * - substring("12345", -42, 1 div 0) returns "12345" + * - substring("12345", -1 div 0, 1 div 0) returns "" + */ +void +xmlXPathSubstringFunction(xmlXPathParserContextPtr ctxt, int nargs) { + xmlXPathObjectPtr str, start, len; + double le=0, in; + int i, l, m; + xmlChar *ret; + + if (nargs < 2) { + CHECK_ARITY(2); + } + if (nargs > 3) { + CHECK_ARITY(3); + } + /* + * take care of possible last (position) argument + */ + if (nargs == 3) { + CAST_TO_NUMBER; + CHECK_TYPE(XPATH_NUMBER); + len = valuePop(ctxt); + le = len->floatval; + xmlXPathReleaseObject(ctxt->context, len); + } + + CAST_TO_NUMBER; + CHECK_TYPE(XPATH_NUMBER); + start = valuePop(ctxt); + in = start->floatval; + xmlXPathReleaseObject(ctxt->context, start); + CAST_TO_STRING; + CHECK_TYPE(XPATH_STRING); + str = valuePop(ctxt); + m = xmlUTF8Strlen((const unsigned char *)str->stringval); + + /* + * If last pos not present, calculate last position + */ + if (nargs != 3) { + le = (double)m; + if (in < 1.0) + in = 1.0; + } + + /* Need to check for the special cases where either + * the index is NaN, the length is NaN, or both + * arguments are infinity (relying on Inf + -Inf = NaN) + */ + if (!xmlXPathIsInf(in) && !xmlXPathIsNaN(in + le)) { + /* + * To meet the requirements of the spec, the arguments + * must be converted to integer format before + * initial index calculations are done + * + * First we go to integer form, rounding up + * and checking for special cases + */ + i = (int) in; + if (((double)i)+0.5 <= in) i++; + + if (xmlXPathIsInf(le) == 1) { + l = m; + if (i < 1) + i = 1; + } + else if (xmlXPathIsInf(le) == -1 || le < 0.0) + l = 0; + else { + l = (int) le; + if (((double)l)+0.5 <= le) l++; + } + + /* Now we normalize inidices */ + i -= 1; + l += i; + if (i < 0) + i = 0; + if (l > m) + l = m; + + /* number of chars to copy */ + l -= i; + + ret = xmlUTF8Strsub(str->stringval, i, l); + } + else { + ret = NULL; + } + if (ret == NULL) + valuePush(ctxt, xmlXPathCacheNewCString(ctxt->context, "")); + else { + valuePush(ctxt, xmlXPathCacheNewString(ctxt->context, ret)); + xmlFree(ret); + } + xmlXPathReleaseObject(ctxt->context, str); +} + +/** + * xmlXPathSubstringBeforeFunction: + * @ctxt: the XPath Parser context + * @nargs: the number of arguments + * + * Implement the substring-before() XPath function + * string substring-before(string, string) + * The substring-before function returns the substring of the first + * argument string that precedes the first occurrence of the second + * argument string in the first argument string, or the empty string + * if the first argument string does not contain the second argument + * string. For example, substring-before("1999/04/01","/") returns 1999. + */ +void +xmlXPathSubstringBeforeFunction(xmlXPathParserContextPtr ctxt, int nargs) { + xmlXPathObjectPtr str; + xmlXPathObjectPtr find; + xmlBufPtr target; + const xmlChar *point; + int offset; + + CHECK_ARITY(2); + CAST_TO_STRING; + find = valuePop(ctxt); + CAST_TO_STRING; + str = valuePop(ctxt); + + target = xmlBufCreate(); + if (target) { + point = xmlStrstr(str->stringval, find->stringval); + if (point) { + offset = (int)(point - str->stringval); + xmlBufAdd(target, str->stringval, offset); + } + valuePush(ctxt, xmlXPathCacheNewString(ctxt->context, + xmlBufContent(target))); + xmlBufFree(target); + } + xmlXPathReleaseObject(ctxt->context, str); + xmlXPathReleaseObject(ctxt->context, find); +} + +/** + * xmlXPathSubstringAfterFunction: + * @ctxt: the XPath Parser context + * @nargs: the number of arguments + * + * Implement the substring-after() XPath function + * string substring-after(string, string) + * The substring-after function returns the substring of the first + * argument string that follows the first occurrence of the second + * argument string in the first argument string, or the empty stringi + * if the first argument string does not contain the second argument + * string. For example, substring-after("1999/04/01","/") returns 04/01, + * and substring-after("1999/04/01","19") returns 99/04/01. + */ +void +xmlXPathSubstringAfterFunction(xmlXPathParserContextPtr ctxt, int nargs) { + xmlXPathObjectPtr str; + xmlXPathObjectPtr find; + xmlBufPtr target; + const xmlChar *point; + int offset; + + CHECK_ARITY(2); + CAST_TO_STRING; + find = valuePop(ctxt); + CAST_TO_STRING; + str = valuePop(ctxt); + + target = xmlBufCreate(); + if (target) { + point = xmlStrstr(str->stringval, find->stringval); + if (point) { + offset = (int)(point - str->stringval) + xmlStrlen(find->stringval); + xmlBufAdd(target, &str->stringval[offset], + xmlStrlen(str->stringval) - offset); + } + valuePush(ctxt, xmlXPathCacheNewString(ctxt->context, + xmlBufContent(target))); + xmlBufFree(target); + } + xmlXPathReleaseObject(ctxt->context, str); + xmlXPathReleaseObject(ctxt->context, find); +} + +/** + * xmlXPathNormalizeFunction: + * @ctxt: the XPath Parser context + * @nargs: the number of arguments + * + * Implement the normalize-space() XPath function + * string normalize-space(string?) + * The normalize-space function returns the argument string with white + * space normalized by stripping leading and trailing whitespace + * and replacing sequences of whitespace characters by a single + * space. Whitespace characters are the same allowed by the S production + * in XML. If the argument is omitted, it defaults to the context + * node converted to a string, in other words the value of the context node. + */ +void +xmlXPathNormalizeFunction(xmlXPathParserContextPtr ctxt, int nargs) { + xmlXPathObjectPtr obj = NULL; + xmlChar *source = NULL; + xmlBufPtr target; + xmlChar blank; + + if (ctxt == NULL) return; + if (nargs == 0) { + /* Use current context node */ + valuePush(ctxt, + xmlXPathCacheWrapString(ctxt->context, + xmlXPathCastNodeToString(ctxt->context->node))); + nargs = 1; + } + + CHECK_ARITY(1); + CAST_TO_STRING; + CHECK_TYPE(XPATH_STRING); + obj = valuePop(ctxt); + source = obj->stringval; + + target = xmlBufCreate(); + if (target && source) { + + /* Skip leading whitespaces */ + while (IS_BLANK_CH(*source)) + source++; + + /* Collapse intermediate whitespaces, and skip trailing whitespaces */ + blank = 0; + while (*source) { + if (IS_BLANK_CH(*source)) { + blank = 0x20; + } else { + if (blank) { + xmlBufAdd(target, &blank, 1); + blank = 0; + } + xmlBufAdd(target, source, 1); + } + source++; + } + valuePush(ctxt, xmlXPathCacheNewString(ctxt->context, + xmlBufContent(target))); + xmlBufFree(target); + } + xmlXPathReleaseObject(ctxt->context, obj); +} + +/** + * xmlXPathTranslateFunction: + * @ctxt: the XPath Parser context + * @nargs: the number of arguments + * + * Implement the translate() XPath function + * string translate(string, string, string) + * The translate function returns the first argument string with + * occurrences of characters in the second argument string replaced + * by the character at the corresponding position in the third argument + * string. For example, translate("bar","abc","ABC") returns the string + * BAr. If there is a character in the second argument string with no + * character at a corresponding position in the third argument string + * (because the second argument string is longer than the third argument + * string), then occurrences of that character in the first argument + * string are removed. For example, translate("--aaa--","abc-","ABC") + * returns "AAA". If a character occurs more than once in second + * argument string, then the first occurrence determines the replacement + * character. If the third argument string is longer than the second + * argument string, then excess characters are ignored. + */ +void +xmlXPathTranslateFunction(xmlXPathParserContextPtr ctxt, int nargs) { + xmlXPathObjectPtr str; + xmlXPathObjectPtr from; + xmlXPathObjectPtr to; + xmlBufPtr target; + int offset, max; + xmlChar ch; + const xmlChar *point; + xmlChar *cptr; + + CHECK_ARITY(3); + + CAST_TO_STRING; + to = valuePop(ctxt); + CAST_TO_STRING; + from = valuePop(ctxt); + CAST_TO_STRING; + str = valuePop(ctxt); + + target = xmlBufCreate(); + if (target) { + max = xmlUTF8Strlen(to->stringval); + for (cptr = str->stringval; (ch=*cptr); ) { + offset = xmlUTF8Strloc(from->stringval, cptr); + if (offset >= 0) { + if (offset < max) { + point = xmlUTF8Strpos(to->stringval, offset); + if (point) + xmlBufAdd(target, point, xmlUTF8Strsize(point, 1)); + } + } else + xmlBufAdd(target, cptr, xmlUTF8Strsize(cptr, 1)); + + /* Step to next character in input */ + cptr++; + if ( ch & 0x80 ) { + /* if not simple ascii, verify proper format */ + if ( (ch & 0xc0) != 0xc0 ) { + xmlGenericError(xmlGenericErrorContext, + "xmlXPathTranslateFunction: Invalid UTF8 string\n"); + /* not asserting an XPath error is probably better */ + break; + } + /* then skip over remaining bytes for this char */ + while ( (ch <<= 1) & 0x80 ) + if ( (*cptr++ & 0xc0) != 0x80 ) { + xmlGenericError(xmlGenericErrorContext, + "xmlXPathTranslateFunction: Invalid UTF8 string\n"); + /* not asserting an XPath error is probably better */ + break; + } + if (ch & 0x80) /* must have had error encountered */ + break; + } + } + } + valuePush(ctxt, xmlXPathCacheNewString(ctxt->context, + xmlBufContent(target))); + xmlBufFree(target); + xmlXPathReleaseObject(ctxt->context, str); + xmlXPathReleaseObject(ctxt->context, from); + xmlXPathReleaseObject(ctxt->context, to); +} + +/** + * xmlXPathBooleanFunction: + * @ctxt: the XPath Parser context + * @nargs: the number of arguments + * + * Implement the boolean() XPath function + * boolean boolean(object) + * The boolean function converts its argument to a boolean as follows: + * - a number is true if and only if it is neither positive or + * negative zero nor NaN + * - a node-set is true if and only if it is non-empty + * - a string is true if and only if its length is non-zero + */ +void +xmlXPathBooleanFunction(xmlXPathParserContextPtr ctxt, int nargs) { + xmlXPathObjectPtr cur; + + CHECK_ARITY(1); + cur = valuePop(ctxt); + if (cur == NULL) XP_ERROR(XPATH_INVALID_OPERAND); + cur = xmlXPathCacheConvertBoolean(ctxt->context, cur); + valuePush(ctxt, cur); +} + +/** + * xmlXPathNotFunction: + * @ctxt: the XPath Parser context + * @nargs: the number of arguments + * + * Implement the not() XPath function + * boolean not(boolean) + * The not function returns true if its argument is false, + * and false otherwise. + */ +void +xmlXPathNotFunction(xmlXPathParserContextPtr ctxt, int nargs) { + CHECK_ARITY(1); + CAST_TO_BOOLEAN; + CHECK_TYPE(XPATH_BOOLEAN); + ctxt->value->boolval = ! ctxt->value->boolval; +} + +/** + * xmlXPathTrueFunction: + * @ctxt: the XPath Parser context + * @nargs: the number of arguments + * + * Implement the true() XPath function + * boolean true() + */ +void +xmlXPathTrueFunction(xmlXPathParserContextPtr ctxt, int nargs) { + CHECK_ARITY(0); + valuePush(ctxt, xmlXPathCacheNewBoolean(ctxt->context, 1)); +} + +/** + * xmlXPathFalseFunction: + * @ctxt: the XPath Parser context + * @nargs: the number of arguments + * + * Implement the false() XPath function + * boolean false() + */ +void +xmlXPathFalseFunction(xmlXPathParserContextPtr ctxt, int nargs) { + CHECK_ARITY(0); + valuePush(ctxt, xmlXPathCacheNewBoolean(ctxt->context, 0)); +} + +/** + * xmlXPathLangFunction: + * @ctxt: the XPath Parser context + * @nargs: the number of arguments + * + * Implement the lang() XPath function + * boolean lang(string) + * The lang function returns true or false depending on whether the + * language of the context node as specified by xml:lang attributes + * is the same as or is a sublanguage of the language specified by + * the argument string. The language of the context node is determined + * by the value of the xml:lang attribute on the context node, or, if + * the context node has no xml:lang attribute, by the value of the + * xml:lang attribute on the nearest ancestor of the context node that + * has an xml:lang attribute. If there is no such attribute, then lang + * returns false. If there is such an attribute, then lang returns + * true if the attribute value is equal to the argument ignoring case, + * or if there is some suffix starting with - such that the attribute + * value is equal to the argument ignoring that suffix of the attribute + * value and ignoring case. + */ +void +xmlXPathLangFunction(xmlXPathParserContextPtr ctxt, int nargs) { + xmlXPathObjectPtr val = NULL; + const xmlChar *theLang = NULL; + const xmlChar *lang; + int ret = 0; + int i; + + CHECK_ARITY(1); + CAST_TO_STRING; + CHECK_TYPE(XPATH_STRING); + val = valuePop(ctxt); + lang = val->stringval; + theLang = xmlNodeGetLang(ctxt->context->node); + if ((theLang != NULL) && (lang != NULL)) { + for (i = 0;lang[i] != 0;i++) + if (toupper(lang[i]) != toupper(theLang[i])) + goto not_equal; + if ((theLang[i] == 0) || (theLang[i] == '-')) + ret = 1; + } +not_equal: + if (theLang != NULL) + xmlFree((void *)theLang); + + xmlXPathReleaseObject(ctxt->context, val); + valuePush(ctxt, xmlXPathCacheNewBoolean(ctxt->context, ret)); +} + +/** + * xmlXPathNumberFunction: + * @ctxt: the XPath Parser context + * @nargs: the number of arguments + * + * Implement the number() XPath function + * number number(object?) + */ +void +xmlXPathNumberFunction(xmlXPathParserContextPtr ctxt, int nargs) { + xmlXPathObjectPtr cur; + double res; + + if (ctxt == NULL) return; + if (nargs == 0) { + if (ctxt->context->node == NULL) { + valuePush(ctxt, xmlXPathCacheNewFloat(ctxt->context, 0.0)); + } else { + xmlChar* content = xmlNodeGetContent(ctxt->context->node); + + res = xmlXPathStringEvalNumber(content); + valuePush(ctxt, xmlXPathCacheNewFloat(ctxt->context, res)); + xmlFree(content); + } + return; + } + + CHECK_ARITY(1); + cur = valuePop(ctxt); + valuePush(ctxt, xmlXPathCacheConvertNumber(ctxt->context, cur)); +} + +/** + * xmlXPathSumFunction: + * @ctxt: the XPath Parser context + * @nargs: the number of arguments + * + * Implement the sum() XPath function + * number sum(node-set) + * The sum function returns the sum of the values of the nodes in + * the argument node-set. + */ +void +xmlXPathSumFunction(xmlXPathParserContextPtr ctxt, int nargs) { + xmlXPathObjectPtr cur; + int i; + double res = 0.0; + + CHECK_ARITY(1); + if ((ctxt->value == NULL) || + ((ctxt->value->type != XPATH_NODESET) && + (ctxt->value->type != XPATH_XSLT_TREE))) + XP_ERROR(XPATH_INVALID_TYPE); + cur = valuePop(ctxt); + + if ((cur->nodesetval != NULL) && (cur->nodesetval->nodeNr != 0)) { + for (i = 0; i < cur->nodesetval->nodeNr; i++) { + res += xmlXPathCastNodeToNumber(cur->nodesetval->nodeTab[i]); + } + } + valuePush(ctxt, xmlXPathCacheNewFloat(ctxt->context, res)); + xmlXPathReleaseObject(ctxt->context, cur); +} + +/* + * To assure working code on multiple platforms, we want to only depend + * upon the characteristic truncation of converting a floating point value + * to an integer. Unfortunately, because of the different storage sizes + * of our internal floating point value (double) and integer (int), we + * can't directly convert (see bug 301162). This macro is a messy + * 'workaround' + */ +#define XTRUNC(f, v) \ + f = fmod((v), INT_MAX); \ + f = (v) - (f) + (double)((int)(f)); + +/** + * xmlXPathFloorFunction: + * @ctxt: the XPath Parser context + * @nargs: the number of arguments + * + * Implement the floor() XPath function + * number floor(number) + * The floor function returns the largest (closest to positive infinity) + * number that is not greater than the argument and that is an integer. + */ +void +xmlXPathFloorFunction(xmlXPathParserContextPtr ctxt, int nargs) { + double f; + + CHECK_ARITY(1); + CAST_TO_NUMBER; + CHECK_TYPE(XPATH_NUMBER); + + XTRUNC(f, ctxt->value->floatval); + if (f != ctxt->value->floatval) { + if (ctxt->value->floatval > 0) + ctxt->value->floatval = f; + else + ctxt->value->floatval = f - 1; + } +} + +/** + * xmlXPathCeilingFunction: + * @ctxt: the XPath Parser context + * @nargs: the number of arguments + * + * Implement the ceiling() XPath function + * number ceiling(number) + * The ceiling function returns the smallest (closest to negative infinity) + * number that is not less than the argument and that is an integer. + */ +void +xmlXPathCeilingFunction(xmlXPathParserContextPtr ctxt, int nargs) { + double f; + + CHECK_ARITY(1); + CAST_TO_NUMBER; + CHECK_TYPE(XPATH_NUMBER); + +#if 0 + ctxt->value->floatval = ceil(ctxt->value->floatval); +#else + XTRUNC(f, ctxt->value->floatval); + if (f != ctxt->value->floatval) { + if (ctxt->value->floatval > 0) + ctxt->value->floatval = f + 1; + else { + if (ctxt->value->floatval < 0 && f == 0) + ctxt->value->floatval = xmlXPathNZERO; + else + ctxt->value->floatval = f; + } + + } +#endif +} + +/** + * xmlXPathRoundFunction: + * @ctxt: the XPath Parser context + * @nargs: the number of arguments + * + * Implement the round() XPath function + * number round(number) + * The round function returns the number that is closest to the + * argument and that is an integer. If there are two such numbers, + * then the one that is even is returned. + */ +void +xmlXPathRoundFunction(xmlXPathParserContextPtr ctxt, int nargs) { + double f; + + CHECK_ARITY(1); + CAST_TO_NUMBER; + CHECK_TYPE(XPATH_NUMBER); + + if ((xmlXPathIsNaN(ctxt->value->floatval)) || + (xmlXPathIsInf(ctxt->value->floatval) == 1) || + (xmlXPathIsInf(ctxt->value->floatval) == -1) || + (ctxt->value->floatval == 0.0)) + return; + + XTRUNC(f, ctxt->value->floatval); + if (ctxt->value->floatval < 0) { + if (ctxt->value->floatval < f - 0.5) + ctxt->value->floatval = f - 1; + else + ctxt->value->floatval = f; + if (ctxt->value->floatval == 0) + ctxt->value->floatval = xmlXPathNZERO; + } else { + if (ctxt->value->floatval < f + 0.5) + ctxt->value->floatval = f; + else + ctxt->value->floatval = f + 1; + } +} + +/************************************************************************ + * * + * The Parser * + * * + ************************************************************************/ + +/* + * a few forward declarations since we use a recursive call based + * implementation. + */ +static void xmlXPathCompileExpr(xmlXPathParserContextPtr ctxt, int sort); +static void xmlXPathCompPredicate(xmlXPathParserContextPtr ctxt, int filter); +static void xmlXPathCompLocationPath(xmlXPathParserContextPtr ctxt); +static void xmlXPathCompRelativeLocationPath(xmlXPathParserContextPtr ctxt); +static xmlChar * xmlXPathParseNameComplex(xmlXPathParserContextPtr ctxt, + int qualified); + +/** + * xmlXPathCurrentChar: + * @ctxt: the XPath parser context + * @cur: pointer to the beginning of the char + * @len: pointer to the length of the char read + * + * The current char value, if using UTF-8 this may actually span multiple + * bytes in the input buffer. + * + * Returns the current char value and its length + */ + +static int +xmlXPathCurrentChar(xmlXPathParserContextPtr ctxt, int *len) { + unsigned char c; + unsigned int val; + const xmlChar *cur; + + if (ctxt == NULL) + return(0); + cur = ctxt->cur; + + /* + * We are supposed to handle UTF8, check it's valid + * From rfc2044: encoding of the Unicode values on UTF-8: + * + * UCS-4 range (hex.) UTF-8 octet sequence (binary) + * 0000 0000-0000 007F 0xxxxxxx + * 0000 0080-0000 07FF 110xxxxx 10xxxxxx + * 0000 0800-0000 FFFF 1110xxxx 10xxxxxx 10xxxxxx + * + * Check for the 0x110000 limit too + */ + c = *cur; + if (c & 0x80) { + if ((cur[1] & 0xc0) != 0x80) + goto encoding_error; + if ((c & 0xe0) == 0xe0) { + + if ((cur[2] & 0xc0) != 0x80) + goto encoding_error; + if ((c & 0xf0) == 0xf0) { + if (((c & 0xf8) != 0xf0) || + ((cur[3] & 0xc0) != 0x80)) + goto encoding_error; + /* 4-byte code */ + *len = 4; + val = (cur[0] & 0x7) << 18; + val |= (cur[1] & 0x3f) << 12; + val |= (cur[2] & 0x3f) << 6; + val |= cur[3] & 0x3f; + } else { + /* 3-byte code */ + *len = 3; + val = (cur[0] & 0xf) << 12; + val |= (cur[1] & 0x3f) << 6; + val |= cur[2] & 0x3f; + } + } else { + /* 2-byte code */ + *len = 2; + val = (cur[0] & 0x1f) << 6; + val |= cur[1] & 0x3f; + } + if (!IS_CHAR(val)) { + XP_ERROR0(XPATH_INVALID_CHAR_ERROR); + } + return(val); + } else { + /* 1-byte code */ + *len = 1; + return((int) *cur); + } +encoding_error: + /* + * If we detect an UTF8 error that probably means that the + * input encoding didn't get properly advertised in the + * declaration header. Report the error and switch the encoding + * to ISO-Latin-1 (if you don't like this policy, just declare the + * encoding !) + */ + *len = 0; + XP_ERROR0(XPATH_ENCODING_ERROR); +} + +/** + * xmlXPathParseNCName: + * @ctxt: the XPath Parser context + * + * parse an XML namespace non qualified name. + * + * [NS 3] NCName ::= (Letter | '_') (NCNameChar)* + * + * [NS 4] NCNameChar ::= Letter | Digit | '.' | '-' | '_' | + * CombiningChar | Extender + * + * Returns the namespace name or NULL + */ + +xmlChar * +xmlXPathParseNCName(xmlXPathParserContextPtr ctxt) { + const xmlChar *in; + xmlChar *ret; + int count = 0; + + if ((ctxt == NULL) || (ctxt->cur == NULL)) return(NULL); + /* + * Accelerator for simple ASCII names + */ + in = ctxt->cur; + if (((*in >= 0x61) && (*in <= 0x7A)) || + ((*in >= 0x41) && (*in <= 0x5A)) || + (*in == '_')) { + in++; + while (((*in >= 0x61) && (*in <= 0x7A)) || + ((*in >= 0x41) && (*in <= 0x5A)) || + ((*in >= 0x30) && (*in <= 0x39)) || + (*in == '_') || (*in == '.') || + (*in == '-')) + in++; + if ((*in == ' ') || (*in == '>') || (*in == '/') || + (*in == '[') || (*in == ']') || (*in == ':') || + (*in == '@') || (*in == '*')) { + count = in - ctxt->cur; + if (count == 0) + return(NULL); + ret = xmlStrndup(ctxt->cur, count); + ctxt->cur = in; + return(ret); + } + } + return(xmlXPathParseNameComplex(ctxt, 0)); +} + + +/** + * xmlXPathParseQName: + * @ctxt: the XPath Parser context + * @prefix: a xmlChar ** + * + * parse an XML qualified name + * + * [NS 5] QName ::= (Prefix ':')? LocalPart + * + * [NS 6] Prefix ::= NCName + * + * [NS 7] LocalPart ::= NCName + * + * Returns the function returns the local part, and prefix is updated + * to get the Prefix if any. + */ + +static xmlChar * +xmlXPathParseQName(xmlXPathParserContextPtr ctxt, xmlChar **prefix) { + xmlChar *ret = NULL; + + *prefix = NULL; + ret = xmlXPathParseNCName(ctxt); + if (ret && CUR == ':') { + *prefix = ret; + NEXT; + ret = xmlXPathParseNCName(ctxt); + } + return(ret); +} + +/** + * xmlXPathParseName: + * @ctxt: the XPath Parser context + * + * parse an XML name + * + * [4] NameChar ::= Letter | Digit | '.' | '-' | '_' | ':' | + * CombiningChar | Extender + * + * [5] Name ::= (Letter | '_' | ':') (NameChar)* + * + * Returns the namespace name or NULL + */ + +xmlChar * +xmlXPathParseName(xmlXPathParserContextPtr ctxt) { + const xmlChar *in; + xmlChar *ret; + size_t count = 0; + + if ((ctxt == NULL) || (ctxt->cur == NULL)) return(NULL); + /* + * Accelerator for simple ASCII names + */ + in = ctxt->cur; + if (((*in >= 0x61) && (*in <= 0x7A)) || + ((*in >= 0x41) && (*in <= 0x5A)) || + (*in == '_') || (*in == ':')) { + in++; + while (((*in >= 0x61) && (*in <= 0x7A)) || + ((*in >= 0x41) && (*in <= 0x5A)) || + ((*in >= 0x30) && (*in <= 0x39)) || + (*in == '_') || (*in == '-') || + (*in == ':') || (*in == '.')) + in++; + if ((*in > 0) && (*in < 0x80)) { + count = in - ctxt->cur; + if (count > XML_MAX_NAME_LENGTH) { + ctxt->cur = in; + XP_ERRORNULL(XPATH_EXPR_ERROR); + } + ret = xmlStrndup(ctxt->cur, count); + ctxt->cur = in; + return(ret); + } + } + return(xmlXPathParseNameComplex(ctxt, 1)); +} + +static xmlChar * +xmlXPathParseNameComplex(xmlXPathParserContextPtr ctxt, int qualified) { + xmlChar buf[XML_MAX_NAMELEN + 5]; + int len = 0, l; + int c; + + /* + * Handler for more complex cases + */ + c = CUR_CHAR(l); + if ((c == ' ') || (c == '>') || (c == '/') || /* accelerators */ + (c == '[') || (c == ']') || (c == '@') || /* accelerators */ + (c == '*') || /* accelerators */ + (!IS_LETTER(c) && (c != '_') && + ((!qualified) || (c != ':')))) { + return(NULL); + } + + while ((c != ' ') && (c != '>') && (c != '/') && /* test bigname.xml */ + ((IS_LETTER(c)) || (IS_DIGIT(c)) || + (c == '.') || (c == '-') || + (c == '_') || ((qualified) && (c == ':')) || + (IS_COMBINING(c)) || + (IS_EXTENDER(c)))) { + COPY_BUF(l,buf,len,c); + NEXTL(l); + c = CUR_CHAR(l); + if (len >= XML_MAX_NAMELEN) { + /* + * Okay someone managed to make a huge name, so he's ready to pay + * for the processing speed. + */ + xmlChar *buffer; + int max = len * 2; + + if (len > XML_MAX_NAME_LENGTH) { + XP_ERRORNULL(XPATH_EXPR_ERROR); + } + buffer = (xmlChar *) xmlMallocAtomic(max * sizeof(xmlChar)); + if (buffer == NULL) { + XP_ERRORNULL(XPATH_MEMORY_ERROR); + } + memcpy(buffer, buf, len); + while ((IS_LETTER(c)) || (IS_DIGIT(c)) || /* test bigname.xml */ + (c == '.') || (c == '-') || + (c == '_') || ((qualified) && (c == ':')) || + (IS_COMBINING(c)) || + (IS_EXTENDER(c))) { + if (len + 10 > max) { + if (max > XML_MAX_NAME_LENGTH) { + XP_ERRORNULL(XPATH_EXPR_ERROR); + } + max *= 2; + buffer = (xmlChar *) xmlRealloc(buffer, + max * sizeof(xmlChar)); + if (buffer == NULL) { + XP_ERRORNULL(XPATH_MEMORY_ERROR); + } + } + COPY_BUF(l,buffer,len,c); + NEXTL(l); + c = CUR_CHAR(l); + } + buffer[len] = 0; + return(buffer); + } + } + if (len == 0) + return(NULL); + return(xmlStrndup(buf, len)); +} + +#define MAX_FRAC 20 + +/* + * These are used as divisors for the fractional part of a number. + * Since the table includes 1.0 (representing '0' fractional digits), + * it must be dimensioned at MAX_FRAC+1 (bug 133921) + */ +static double my_pow10[MAX_FRAC+1] = { + 1.0, 10.0, 100.0, 1000.0, 10000.0, + 100000.0, 1000000.0, 10000000.0, 100000000.0, 1000000000.0, + 10000000000.0, 100000000000.0, 1000000000000.0, 10000000000000.0, + 100000000000000.0, + 1000000000000000.0, 10000000000000000.0, 100000000000000000.0, + 1000000000000000000.0, 10000000000000000000.0, 100000000000000000000.0 +}; + +/** + * xmlXPathStringEvalNumber: + * @str: A string to scan + * + * [30a] Float ::= Number ('e' Digits?)? + * + * [30] Number ::= Digits ('.' Digits?)? + * | '.' Digits + * [31] Digits ::= [0-9]+ + * + * Compile a Number in the string + * In complement of the Number expression, this function also handles + * negative values : '-' Number. + * + * Returns the double value. + */ +double +xmlXPathStringEvalNumber(const xmlChar *str) { + const xmlChar *cur = str; + double ret; + int ok = 0; + int isneg = 0; + int exponent = 0; + int is_exponent_negative = 0; +#ifdef __GNUC__ + unsigned long tmp = 0; + double temp; +#endif + if (cur == NULL) return(0); + while (IS_BLANK_CH(*cur)) cur++; + if ((*cur != '.') && ((*cur < '0') || (*cur > '9')) && (*cur != '-')) { + return(xmlXPathNAN); + } + if (*cur == '-') { + isneg = 1; + cur++; + } + +#ifdef __GNUC__ + /* + * tmp/temp is a workaround against a gcc compiler bug + * http://veillard.com/gcc.bug + */ + ret = 0; + while ((*cur >= '0') && (*cur <= '9')) { + ret = ret * 10; + tmp = (*cur - '0'); + ok = 1; + cur++; + temp = (double) tmp; + ret = ret + temp; + } +#else + ret = 0; + while ((*cur >= '0') && (*cur <= '9')) { + ret = ret * 10 + (*cur - '0'); + ok = 1; + cur++; + } +#endif + + if (*cur == '.') { + int v, frac = 0; + double fraction = 0; + + cur++; + if (((*cur < '0') || (*cur > '9')) && (!ok)) { + return(xmlXPathNAN); + } + while (((*cur >= '0') && (*cur <= '9')) && (frac < MAX_FRAC)) { + v = (*cur - '0'); + fraction = fraction * 10 + v; + frac = frac + 1; + cur++; + } + fraction /= my_pow10[frac]; + ret = ret + fraction; + while ((*cur >= '0') && (*cur <= '9')) + cur++; + } + if ((*cur == 'e') || (*cur == 'E')) { + cur++; + if (*cur == '-') { + is_exponent_negative = 1; + cur++; + } else if (*cur == '+') { + cur++; + } + while ((*cur >= '0') && (*cur <= '9')) { + exponent = exponent * 10 + (*cur - '0'); + cur++; + } + } + while (IS_BLANK_CH(*cur)) cur++; + if (*cur != 0) return(xmlXPathNAN); + if (isneg) ret = -ret; + if (is_exponent_negative) exponent = -exponent; + ret *= pow(10.0, (double)exponent); + return(ret); +} + +/** + * xmlXPathCompNumber: + * @ctxt: the XPath Parser context + * + * [30] Number ::= Digits ('.' Digits?)? + * | '.' Digits + * [31] Digits ::= [0-9]+ + * + * Compile a Number, then push it on the stack + * + */ +static void +xmlXPathCompNumber(xmlXPathParserContextPtr ctxt) +{ + double ret = 0.0; + int ok = 0; + int exponent = 0; + int is_exponent_negative = 0; +#ifdef __GNUC__ + unsigned long tmp = 0; + double temp; +#endif + + CHECK_ERROR; + if ((CUR != '.') && ((CUR < '0') || (CUR > '9'))) { + XP_ERROR(XPATH_NUMBER_ERROR); + } +#ifdef __GNUC__ + /* + * tmp/temp is a workaround against a gcc compiler bug + * http://veillard.com/gcc.bug + */ + ret = 0; + while ((CUR >= '0') && (CUR <= '9')) { + ret = ret * 10; + tmp = (CUR - '0'); + ok = 1; + NEXT; + temp = (double) tmp; + ret = ret + temp; + } +#else + ret = 0; + while ((CUR >= '0') && (CUR <= '9')) { + ret = ret * 10 + (CUR - '0'); + ok = 1; + NEXT; + } +#endif + if (CUR == '.') { + int v, frac = 0; + double fraction = 0; + + NEXT; + if (((CUR < '0') || (CUR > '9')) && (!ok)) { + XP_ERROR(XPATH_NUMBER_ERROR); + } + while ((CUR >= '0') && (CUR <= '9') && (frac < MAX_FRAC)) { + v = (CUR - '0'); + fraction = fraction * 10 + v; + frac = frac + 1; + NEXT; + } + fraction /= my_pow10[frac]; + ret = ret + fraction; + while ((CUR >= '0') && (CUR <= '9')) + NEXT; + } + if ((CUR == 'e') || (CUR == 'E')) { + NEXT; + if (CUR == '-') { + is_exponent_negative = 1; + NEXT; + } else if (CUR == '+') { + NEXT; + } + while ((CUR >= '0') && (CUR <= '9')) { + exponent = exponent * 10 + (CUR - '0'); + NEXT; + } + if (is_exponent_negative) + exponent = -exponent; + ret *= pow(10.0, (double) exponent); + } + PUSH_LONG_EXPR(XPATH_OP_VALUE, XPATH_NUMBER, 0, 0, + xmlXPathCacheNewFloat(ctxt->context, ret), NULL); +} + +/** + * xmlXPathParseLiteral: + * @ctxt: the XPath Parser context + * + * Parse a Literal + * + * [29] Literal ::= '"' [^"]* '"' + * | "'" [^']* "'" + * + * Returns the value found or NULL in case of error + */ +static xmlChar * +xmlXPathParseLiteral(xmlXPathParserContextPtr ctxt) { + const xmlChar *q; + xmlChar *ret = NULL; + + if (CUR == '"') { + NEXT; + q = CUR_PTR; + while ((IS_CHAR_CH(CUR)) && (CUR != '"')) + NEXT; + if (!IS_CHAR_CH(CUR)) { + XP_ERRORNULL(XPATH_UNFINISHED_LITERAL_ERROR); + } else { + ret = xmlStrndup(q, CUR_PTR - q); + NEXT; + } + } else if (CUR == '\'') { + NEXT; + q = CUR_PTR; + while ((IS_CHAR_CH(CUR)) && (CUR != '\'')) + NEXT; + if (!IS_CHAR_CH(CUR)) { + XP_ERRORNULL(XPATH_UNFINISHED_LITERAL_ERROR); + } else { + ret = xmlStrndup(q, CUR_PTR - q); + NEXT; + } + } else { + XP_ERRORNULL(XPATH_START_LITERAL_ERROR); + } + return(ret); +} + +/** + * xmlXPathCompLiteral: + * @ctxt: the XPath Parser context + * + * Parse a Literal and push it on the stack. + * + * [29] Literal ::= '"' [^"]* '"' + * | "'" [^']* "'" + * + * TODO: xmlXPathCompLiteral memory allocation could be improved. + */ +static void +xmlXPathCompLiteral(xmlXPathParserContextPtr ctxt) { + const xmlChar *q; + xmlChar *ret = NULL; + + if (CUR == '"') { + NEXT; + q = CUR_PTR; + while ((IS_CHAR_CH(CUR)) && (CUR != '"')) + NEXT; + if (!IS_CHAR_CH(CUR)) { + XP_ERROR(XPATH_UNFINISHED_LITERAL_ERROR); + } else { + ret = xmlStrndup(q, CUR_PTR - q); + NEXT; + } + } else if (CUR == '\'') { + NEXT; + q = CUR_PTR; + while ((IS_CHAR_CH(CUR)) && (CUR != '\'')) + NEXT; + if (!IS_CHAR_CH(CUR)) { + XP_ERROR(XPATH_UNFINISHED_LITERAL_ERROR); + } else { + ret = xmlStrndup(q, CUR_PTR - q); + NEXT; + } + } else { + XP_ERROR(XPATH_START_LITERAL_ERROR); + } + if (ret == NULL) return; + PUSH_LONG_EXPR(XPATH_OP_VALUE, XPATH_STRING, 0, 0, + xmlXPathCacheNewString(ctxt->context, ret), NULL); + xmlFree(ret); +} + +/** + * xmlXPathCompVariableReference: + * @ctxt: the XPath Parser context + * + * Parse a VariableReference, evaluate it and push it on the stack. + * + * The variable bindings consist of a mapping from variable names + * to variable values. The value of a variable is an object, which can be + * of any of the types that are possible for the value of an expression, + * and may also be of additional types not specified here. + * + * Early evaluation is possible since: + * The variable bindings [...] used to evaluate a subexpression are + * always the same as those used to evaluate the containing expression. + * + * [36] VariableReference ::= '$' QName + */ +static void +xmlXPathCompVariableReference(xmlXPathParserContextPtr ctxt) { + xmlChar *name; + xmlChar *prefix; + + SKIP_BLANKS; + if (CUR != '$') { + XP_ERROR(XPATH_VARIABLE_REF_ERROR); + } + NEXT; + name = xmlXPathParseQName(ctxt, &prefix); + if (name == NULL) { + XP_ERROR(XPATH_VARIABLE_REF_ERROR); + } + ctxt->comp->last = -1; + PUSH_LONG_EXPR(XPATH_OP_VARIABLE, 0, 0, 0, + name, prefix); + SKIP_BLANKS; + if ((ctxt->context != NULL) && (ctxt->context->flags & XML_XPATH_NOVAR)) { + XP_ERROR(XPATH_FORBID_VARIABLE_ERROR); + } +} + +/** + * xmlXPathIsNodeType: + * @name: a name string + * + * Is the name given a NodeType one. + * + * [38] NodeType ::= 'comment' + * | 'text' + * | 'processing-instruction' + * | 'node' + * + * Returns 1 if true 0 otherwise + */ +int +xmlXPathIsNodeType(const xmlChar *name) { + if (name == NULL) + return(0); + + if (xmlStrEqual(name, BAD_CAST "node")) + return(1); + if (xmlStrEqual(name, BAD_CAST "text")) + return(1); + if (xmlStrEqual(name, BAD_CAST "comment")) + return(1); + if (xmlStrEqual(name, BAD_CAST "processing-instruction")) + return(1); + return(0); +} + +/** + * xmlXPathCompFunctionCall: + * @ctxt: the XPath Parser context + * + * [16] FunctionCall ::= FunctionName '(' ( Argument ( ',' Argument)*)? ')' + * [17] Argument ::= Expr + * + * Compile a function call, the evaluation of all arguments are + * pushed on the stack + */ +static void +xmlXPathCompFunctionCall(xmlXPathParserContextPtr ctxt) { + xmlChar *name; + xmlChar *prefix; + int nbargs = 0; + int sort = 1; + + name = xmlXPathParseQName(ctxt, &prefix); + if (name == NULL) { + xmlFree(prefix); + XP_ERROR(XPATH_EXPR_ERROR); + } + SKIP_BLANKS; +#ifdef DEBUG_EXPR + if (prefix == NULL) + xmlGenericError(xmlGenericErrorContext, "Calling function %s\n", + name); + else + xmlGenericError(xmlGenericErrorContext, "Calling function %s:%s\n", + prefix, name); +#endif + + if (CUR != '(') { + XP_ERROR(XPATH_EXPR_ERROR); + } + NEXT; + SKIP_BLANKS; + + /* + * Optimization for count(): we don't need the node-set to be sorted. + */ + if ((prefix == NULL) && (name[0] == 'c') && + xmlStrEqual(name, BAD_CAST "count")) + { + sort = 0; + } + ctxt->comp->last = -1; + if (CUR != ')') { + while (CUR != 0) { + int op1 = ctxt->comp->last; + ctxt->comp->last = -1; + xmlXPathCompileExpr(ctxt, sort); + if (ctxt->error != XPATH_EXPRESSION_OK) { + xmlFree(name); + xmlFree(prefix); + return; + } + PUSH_BINARY_EXPR(XPATH_OP_ARG, op1, ctxt->comp->last, 0, 0); + nbargs++; + if (CUR == ')') break; + if (CUR != ',') { + XP_ERROR(XPATH_EXPR_ERROR); + } + NEXT; + SKIP_BLANKS; + } + } + PUSH_LONG_EXPR(XPATH_OP_FUNCTION, nbargs, 0, 0, + name, prefix); + NEXT; + SKIP_BLANKS; +} + +/** + * xmlXPathCompPrimaryExpr: + * @ctxt: the XPath Parser context + * + * [15] PrimaryExpr ::= VariableReference + * | '(' Expr ')' + * | Literal + * | Number + * | FunctionCall + * + * Compile a primary expression. + */ +static void +xmlXPathCompPrimaryExpr(xmlXPathParserContextPtr ctxt) { + SKIP_BLANKS; + if (CUR == '$') xmlXPathCompVariableReference(ctxt); + else if (CUR == '(') { + NEXT; + SKIP_BLANKS; + xmlXPathCompileExpr(ctxt, 1); + CHECK_ERROR; + if (CUR != ')') { + XP_ERROR(XPATH_EXPR_ERROR); + } + NEXT; + SKIP_BLANKS; + } else if (IS_ASCII_DIGIT(CUR) || (CUR == '.' && IS_ASCII_DIGIT(NXT(1)))) { + xmlXPathCompNumber(ctxt); + } else if ((CUR == '\'') || (CUR == '"')) { + xmlXPathCompLiteral(ctxt); + } else { + xmlXPathCompFunctionCall(ctxt); + } + SKIP_BLANKS; +} + +/** + * xmlXPathCompFilterExpr: + * @ctxt: the XPath Parser context + * + * [20] FilterExpr ::= PrimaryExpr + * | FilterExpr Predicate + * + * Compile a filter expression. + * Square brackets are used to filter expressions in the same way that + * they are used in location paths. It is an error if the expression to + * be filtered does not evaluate to a node-set. The context node list + * used for evaluating the expression in square brackets is the node-set + * to be filtered listed in document order. + */ + +static void +xmlXPathCompFilterExpr(xmlXPathParserContextPtr ctxt) { + xmlXPathCompPrimaryExpr(ctxt); + CHECK_ERROR; + SKIP_BLANKS; + + while (CUR == '[') { + xmlXPathCompPredicate(ctxt, 1); + SKIP_BLANKS; + } + + +} + +/** + * xmlXPathScanName: + * @ctxt: the XPath Parser context + * + * Trickery: parse an XML name but without consuming the input flow + * Needed to avoid insanity in the parser state. + * + * [4] NameChar ::= Letter | Digit | '.' | '-' | '_' | ':' | + * CombiningChar | Extender + * + * [5] Name ::= (Letter | '_' | ':') (NameChar)* + * + * [6] Names ::= Name (S Name)* + * + * Returns the Name parsed or NULL + */ + +static xmlChar * +xmlXPathScanName(xmlXPathParserContextPtr ctxt) { + int len = 0, l; + int c; + const xmlChar *cur; + xmlChar *ret; + + cur = ctxt->cur; + + c = CUR_CHAR(l); + if ((c == ' ') || (c == '>') || (c == '/') || /* accelerators */ + (!IS_LETTER(c) && (c != '_') && + (c != ':'))) { + return(NULL); + } + + while ((c != ' ') && (c != '>') && (c != '/') && /* test bigname.xml */ + ((IS_LETTER(c)) || (IS_DIGIT(c)) || + (c == '.') || (c == '-') || + (c == '_') || (c == ':') || + (IS_COMBINING(c)) || + (IS_EXTENDER(c)))) { + len += l; + NEXTL(l); + c = CUR_CHAR(l); + } + ret = xmlStrndup(cur, ctxt->cur - cur); + ctxt->cur = cur; + return(ret); +} + +/** + * xmlXPathCompPathExpr: + * @ctxt: the XPath Parser context + * + * [19] PathExpr ::= LocationPath + * | FilterExpr + * | FilterExpr '/' RelativeLocationPath + * | FilterExpr '//' RelativeLocationPath + * + * Compile a path expression. + * The / operator and // operators combine an arbitrary expression + * and a relative location path. It is an error if the expression + * does not evaluate to a node-set. + * The / operator does composition in the same way as when / is + * used in a location path. As in location paths, // is short for + * /descendant-or-self::node()/. + */ + +static void +xmlXPathCompPathExpr(xmlXPathParserContextPtr ctxt) { + int lc = 1; /* Should we branch to LocationPath ? */ + xmlChar *name = NULL; /* we may have to preparse a name to find out */ + + SKIP_BLANKS; + if ((CUR == '$') || (CUR == '(') || + (IS_ASCII_DIGIT(CUR)) || + (CUR == '\'') || (CUR == '"') || + (CUR == '.' && IS_ASCII_DIGIT(NXT(1)))) { + lc = 0; + } else if (CUR == '*') { + /* relative or absolute location path */ + lc = 1; + } else if (CUR == '/') { + /* relative or absolute location path */ + lc = 1; + } else if (CUR == '@') { + /* relative abbreviated attribute location path */ + lc = 1; + } else if (CUR == '.') { + /* relative abbreviated attribute location path */ + lc = 1; + } else { + /* + * Problem is finding if we have a name here whether it's: + * - a nodetype + * - a function call in which case it's followed by '(' + * - an axis in which case it's followed by ':' + * - a element name + * We do an a priori analysis here rather than having to + * maintain parsed token content through the recursive function + * calls. This looks uglier but makes the code easier to + * read/write/debug. + */ + SKIP_BLANKS; + name = xmlXPathScanName(ctxt); + if ((name != NULL) && (xmlStrstr(name, (xmlChar *) "::") != NULL)) { +#ifdef DEBUG_STEP + xmlGenericError(xmlGenericErrorContext, + "PathExpr: Axis\n"); +#endif + lc = 1; + xmlFree(name); + } else if (name != NULL) { + int len =xmlStrlen(name); + + + while (NXT(len) != 0) { + if (NXT(len) == '/') { + /* element name */ +#ifdef DEBUG_STEP + xmlGenericError(xmlGenericErrorContext, + "PathExpr: AbbrRelLocation\n"); +#endif + lc = 1; + break; + } else if (IS_BLANK_CH(NXT(len))) { + /* ignore blanks */ + ; + } else if (NXT(len) == ':') { +#ifdef DEBUG_STEP + xmlGenericError(xmlGenericErrorContext, + "PathExpr: AbbrRelLocation\n"); +#endif + lc = 1; + break; + } else if ((NXT(len) == '(')) { + /* Note Type or Function */ + if (xmlXPathIsNodeType(name)) { +#ifdef DEBUG_STEP + xmlGenericError(xmlGenericErrorContext, + "PathExpr: Type search\n"); +#endif + lc = 1; + } else { +#ifdef DEBUG_STEP + xmlGenericError(xmlGenericErrorContext, + "PathExpr: function call\n"); +#endif + lc = 0; + } + break; + } else if ((NXT(len) == '[')) { + /* element name */ +#ifdef DEBUG_STEP + xmlGenericError(xmlGenericErrorContext, + "PathExpr: AbbrRelLocation\n"); +#endif + lc = 1; + break; + } else if ((NXT(len) == '<') || (NXT(len) == '>') || + (NXT(len) == '=')) { + lc = 1; + break; + } else { + lc = 1; + break; + } + len++; + } + if (NXT(len) == 0) { +#ifdef DEBUG_STEP + xmlGenericError(xmlGenericErrorContext, + "PathExpr: AbbrRelLocation\n"); +#endif + /* element name */ + lc = 1; + } + xmlFree(name); + } else { + /* make sure all cases are covered explicitly */ + XP_ERROR(XPATH_EXPR_ERROR); + } + } + + if (lc) { + if (CUR == '/') { + PUSH_LEAVE_EXPR(XPATH_OP_ROOT, 0, 0); + } else { + PUSH_LEAVE_EXPR(XPATH_OP_NODE, 0, 0); + } + xmlXPathCompLocationPath(ctxt); + } else { + xmlXPathCompFilterExpr(ctxt); + CHECK_ERROR; + if ((CUR == '/') && (NXT(1) == '/')) { + SKIP(2); + SKIP_BLANKS; + + PUSH_LONG_EXPR(XPATH_OP_COLLECT, AXIS_DESCENDANT_OR_SELF, + NODE_TEST_TYPE, NODE_TYPE_NODE, NULL, NULL); + PUSH_UNARY_EXPR(XPATH_OP_RESET, ctxt->comp->last, 1, 0); + + xmlXPathCompRelativeLocationPath(ctxt); + } else if (CUR == '/') { + xmlXPathCompRelativeLocationPath(ctxt); + } + } + SKIP_BLANKS; +} + +/** + * xmlXPathCompUnionExpr: + * @ctxt: the XPath Parser context + * + * [18] UnionExpr ::= PathExpr + * | UnionExpr '|' PathExpr + * + * Compile an union expression. + */ + +static void +xmlXPathCompUnionExpr(xmlXPathParserContextPtr ctxt) { + xmlXPathCompPathExpr(ctxt); + CHECK_ERROR; + SKIP_BLANKS; + while (CUR == '|') { + int op1 = ctxt->comp->last; + PUSH_LEAVE_EXPR(XPATH_OP_NODE, 0, 0); + + NEXT; + SKIP_BLANKS; + xmlXPathCompPathExpr(ctxt); + + PUSH_BINARY_EXPR(XPATH_OP_UNION, op1, ctxt->comp->last, 0, 0); + + SKIP_BLANKS; + } +} + +/** + * xmlXPathCompUnaryExpr: + * @ctxt: the XPath Parser context + * + * [27] UnaryExpr ::= UnionExpr + * | '-' UnaryExpr + * + * Compile an unary expression. + */ + +static void +xmlXPathCompUnaryExpr(xmlXPathParserContextPtr ctxt) { + int minus = 0; + int found = 0; + + SKIP_BLANKS; + while (CUR == '-') { + minus = 1 - minus; + found = 1; + NEXT; + SKIP_BLANKS; + } + + xmlXPathCompUnionExpr(ctxt); + CHECK_ERROR; + if (found) { + if (minus) + PUSH_UNARY_EXPR(XPATH_OP_PLUS, ctxt->comp->last, 2, 0); + else + PUSH_UNARY_EXPR(XPATH_OP_PLUS, ctxt->comp->last, 3, 0); + } +} + +/** + * xmlXPathCompMultiplicativeExpr: + * @ctxt: the XPath Parser context + * + * [26] MultiplicativeExpr ::= UnaryExpr + * | MultiplicativeExpr MultiplyOperator UnaryExpr + * | MultiplicativeExpr 'div' UnaryExpr + * | MultiplicativeExpr 'mod' UnaryExpr + * [34] MultiplyOperator ::= '*' + * + * Compile an Additive expression. + */ + +static void +xmlXPathCompMultiplicativeExpr(xmlXPathParserContextPtr ctxt) { + xmlXPathCompUnaryExpr(ctxt); + CHECK_ERROR; + SKIP_BLANKS; + while ((CUR == '*') || + ((CUR == 'd') && (NXT(1) == 'i') && (NXT(2) == 'v')) || + ((CUR == 'm') && (NXT(1) == 'o') && (NXT(2) == 'd'))) { + int op = -1; + int op1 = ctxt->comp->last; + + if (CUR == '*') { + op = 0; + NEXT; + } else if (CUR == 'd') { + op = 1; + SKIP(3); + } else if (CUR == 'm') { + op = 2; + SKIP(3); + } + SKIP_BLANKS; + xmlXPathCompUnaryExpr(ctxt); + CHECK_ERROR; + PUSH_BINARY_EXPR(XPATH_OP_MULT, op1, ctxt->comp->last, op, 0); + SKIP_BLANKS; + } +} + +/** + * xmlXPathCompAdditiveExpr: + * @ctxt: the XPath Parser context + * + * [25] AdditiveExpr ::= MultiplicativeExpr + * | AdditiveExpr '+' MultiplicativeExpr + * | AdditiveExpr '-' MultiplicativeExpr + * + * Compile an Additive expression. + */ + +static void +xmlXPathCompAdditiveExpr(xmlXPathParserContextPtr ctxt) { + + xmlXPathCompMultiplicativeExpr(ctxt); + CHECK_ERROR; + SKIP_BLANKS; + while ((CUR == '+') || (CUR == '-')) { + int plus; + int op1 = ctxt->comp->last; + + if (CUR == '+') plus = 1; + else plus = 0; + NEXT; + SKIP_BLANKS; + xmlXPathCompMultiplicativeExpr(ctxt); + CHECK_ERROR; + PUSH_BINARY_EXPR(XPATH_OP_PLUS, op1, ctxt->comp->last, plus, 0); + SKIP_BLANKS; + } +} + +/** + * xmlXPathCompRelationalExpr: + * @ctxt: the XPath Parser context + * + * [24] RelationalExpr ::= AdditiveExpr + * | RelationalExpr '<' AdditiveExpr + * | RelationalExpr '>' AdditiveExpr + * | RelationalExpr '<=' AdditiveExpr + * | RelationalExpr '>=' AdditiveExpr + * + * A <= B > C is allowed ? Answer from James, yes with + * (AdditiveExpr <= AdditiveExpr) > AdditiveExpr + * which is basically what got implemented. + * + * Compile a Relational expression, then push the result + * on the stack + */ + +static void +xmlXPathCompRelationalExpr(xmlXPathParserContextPtr ctxt) { + xmlXPathCompAdditiveExpr(ctxt); + CHECK_ERROR; + SKIP_BLANKS; + while ((CUR == '<') || + (CUR == '>') || + ((CUR == '<') && (NXT(1) == '=')) || + ((CUR == '>') && (NXT(1) == '='))) { + int inf, strict; + int op1 = ctxt->comp->last; + + if (CUR == '<') inf = 1; + else inf = 0; + if (NXT(1) == '=') strict = 0; + else strict = 1; + NEXT; + if (!strict) NEXT; + SKIP_BLANKS; + xmlXPathCompAdditiveExpr(ctxt); + CHECK_ERROR; + PUSH_BINARY_EXPR(XPATH_OP_CMP, op1, ctxt->comp->last, inf, strict); + SKIP_BLANKS; + } +} + +/** + * xmlXPathCompEqualityExpr: + * @ctxt: the XPath Parser context + * + * [23] EqualityExpr ::= RelationalExpr + * | EqualityExpr '=' RelationalExpr + * | EqualityExpr '!=' RelationalExpr + * + * A != B != C is allowed ? Answer from James, yes with + * (RelationalExpr = RelationalExpr) = RelationalExpr + * (RelationalExpr != RelationalExpr) != RelationalExpr + * which is basically what got implemented. + * + * Compile an Equality expression. + * + */ +static void +xmlXPathCompEqualityExpr(xmlXPathParserContextPtr ctxt) { + xmlXPathCompRelationalExpr(ctxt); + CHECK_ERROR; + SKIP_BLANKS; + while ((CUR == '=') || ((CUR == '!') && (NXT(1) == '='))) { + int eq; + int op1 = ctxt->comp->last; + + if (CUR == '=') eq = 1; + else eq = 0; + NEXT; + if (!eq) NEXT; + SKIP_BLANKS; + xmlXPathCompRelationalExpr(ctxt); + CHECK_ERROR; + PUSH_BINARY_EXPR(XPATH_OP_EQUAL, op1, ctxt->comp->last, eq, 0); + SKIP_BLANKS; + } +} + +/** + * xmlXPathCompAndExpr: + * @ctxt: the XPath Parser context + * + * [22] AndExpr ::= EqualityExpr + * | AndExpr 'and' EqualityExpr + * + * Compile an AND expression. + * + */ +static void +xmlXPathCompAndExpr(xmlXPathParserContextPtr ctxt) { + xmlXPathCompEqualityExpr(ctxt); + CHECK_ERROR; + SKIP_BLANKS; + while ((CUR == 'a') && (NXT(1) == 'n') && (NXT(2) == 'd')) { + int op1 = ctxt->comp->last; + SKIP(3); + SKIP_BLANKS; + xmlXPathCompEqualityExpr(ctxt); + CHECK_ERROR; + PUSH_BINARY_EXPR(XPATH_OP_AND, op1, ctxt->comp->last, 0, 0); + SKIP_BLANKS; + } +} + +/** + * xmlXPathCompileExpr: + * @ctxt: the XPath Parser context + * + * [14] Expr ::= OrExpr + * [21] OrExpr ::= AndExpr + * | OrExpr 'or' AndExpr + * + * Parse and compile an expression + */ +static void +xmlXPathCompileExpr(xmlXPathParserContextPtr ctxt, int sort) { + xmlXPathCompAndExpr(ctxt); + CHECK_ERROR; + SKIP_BLANKS; + while ((CUR == 'o') && (NXT(1) == 'r')) { + int op1 = ctxt->comp->last; + SKIP(2); + SKIP_BLANKS; + xmlXPathCompAndExpr(ctxt); + CHECK_ERROR; + PUSH_BINARY_EXPR(XPATH_OP_OR, op1, ctxt->comp->last, 0, 0); + SKIP_BLANKS; + } + if ((sort) && (ctxt->comp->steps[ctxt->comp->last].op != XPATH_OP_VALUE)) { + /* more ops could be optimized too */ + /* + * This is the main place to eliminate sorting for + * operations which don't require a sorted node-set. + * E.g. count(). + */ + PUSH_UNARY_EXPR(XPATH_OP_SORT, ctxt->comp->last , 0, 0); + } +} + +/** + * xmlXPathCompPredicate: + * @ctxt: the XPath Parser context + * @filter: act as a filter + * + * [8] Predicate ::= '[' PredicateExpr ']' + * [9] PredicateExpr ::= Expr + * + * Compile a predicate expression + */ +static void +xmlXPathCompPredicate(xmlXPathParserContextPtr ctxt, int filter) { + int op1 = ctxt->comp->last; + + SKIP_BLANKS; + if (CUR != '[') { + XP_ERROR(XPATH_INVALID_PREDICATE_ERROR); + } + NEXT; + SKIP_BLANKS; + + ctxt->comp->last = -1; + /* + * This call to xmlXPathCompileExpr() will deactivate sorting + * of the predicate result. + * TODO: Sorting is still activated for filters, since I'm not + * sure if needed. Normally sorting should not be needed, since + * a filter can only diminish the number of items in a sequence, + * but won't change its order; so if the initial sequence is sorted, + * subsequent sorting is not needed. + */ + if (! filter) + xmlXPathCompileExpr(ctxt, 0); + else + xmlXPathCompileExpr(ctxt, 1); + CHECK_ERROR; + + if (CUR != ']') { + XP_ERROR(XPATH_INVALID_PREDICATE_ERROR); + } + + if (filter) + PUSH_BINARY_EXPR(XPATH_OP_FILTER, op1, ctxt->comp->last, 0, 0); + else + PUSH_BINARY_EXPR(XPATH_OP_PREDICATE, op1, ctxt->comp->last, 0, 0); + + NEXT; + SKIP_BLANKS; +} + +/** + * xmlXPathCompNodeTest: + * @ctxt: the XPath Parser context + * @test: pointer to a xmlXPathTestVal + * @type: pointer to a xmlXPathTypeVal + * @prefix: placeholder for a possible name prefix + * + * [7] NodeTest ::= NameTest + * | NodeType '(' ')' + * | 'processing-instruction' '(' Literal ')' + * + * [37] NameTest ::= '*' + * | NCName ':' '*' + * | QName + * [38] NodeType ::= 'comment' + * | 'text' + * | 'processing-instruction' + * | 'node' + * + * Returns the name found and updates @test, @type and @prefix appropriately + */ +static xmlChar * +xmlXPathCompNodeTest(xmlXPathParserContextPtr ctxt, xmlXPathTestVal *test, + xmlXPathTypeVal *type, const xmlChar **prefix, + xmlChar *name) { + int blanks; + + if ((test == NULL) || (type == NULL) || (prefix == NULL)) { + STRANGE; + return(NULL); + } + *type = (xmlXPathTypeVal) 0; + *test = (xmlXPathTestVal) 0; + *prefix = NULL; + SKIP_BLANKS; + + if ((name == NULL) && (CUR == '*')) { + /* + * All elements + */ + NEXT; + *test = NODE_TEST_ALL; + return(NULL); + } + + if (name == NULL) + name = xmlXPathParseNCName(ctxt); + if (name == NULL) { + XP_ERRORNULL(XPATH_EXPR_ERROR); + } + + blanks = IS_BLANK_CH(CUR); + SKIP_BLANKS; + if (CUR == '(') { + NEXT; + /* + * NodeType or PI search + */ + if (xmlStrEqual(name, BAD_CAST "comment")) + *type = NODE_TYPE_COMMENT; + else if (xmlStrEqual(name, BAD_CAST "node")) + *type = NODE_TYPE_NODE; + else if (xmlStrEqual(name, BAD_CAST "processing-instruction")) + *type = NODE_TYPE_PI; + else if (xmlStrEqual(name, BAD_CAST "text")) + *type = NODE_TYPE_TEXT; + else { + if (name != NULL) + xmlFree(name); + XP_ERRORNULL(XPATH_EXPR_ERROR); + } + + *test = NODE_TEST_TYPE; + + SKIP_BLANKS; + if (*type == NODE_TYPE_PI) { + /* + * Specific case: search a PI by name. + */ + if (name != NULL) + xmlFree(name); + name = NULL; + if (CUR != ')') { + name = xmlXPathParseLiteral(ctxt); + CHECK_ERROR NULL; + *test = NODE_TEST_PI; + SKIP_BLANKS; + } + } + if (CUR != ')') { + if (name != NULL) + xmlFree(name); + XP_ERRORNULL(XPATH_UNCLOSED_ERROR); + } + NEXT; + return(name); + } + *test = NODE_TEST_NAME; + if ((!blanks) && (CUR == ':')) { + NEXT; + + /* + * Since currently the parser context don't have a + * namespace list associated: + * The namespace name for this prefix can be computed + * only at evaluation time. The compilation is done + * outside of any context. + */ +#if 0 + *prefix = xmlXPathNsLookup(ctxt->context, name); + if (name != NULL) + xmlFree(name); + if (*prefix == NULL) { + XP_ERROR0(XPATH_UNDEF_PREFIX_ERROR); + } +#else + *prefix = name; +#endif + + if (CUR == '*') { + /* + * All elements + */ + NEXT; + *test = NODE_TEST_ALL; + return(NULL); + } + + name = xmlXPathParseNCName(ctxt); + if (name == NULL) { + XP_ERRORNULL(XPATH_EXPR_ERROR); + } + } + return(name); +} + +/** + * xmlXPathIsAxisName: + * @name: a preparsed name token + * + * [6] AxisName ::= 'ancestor' + * | 'ancestor-or-self' + * | 'attribute' + * | 'child' + * | 'descendant' + * | 'descendant-or-self' + * | 'following' + * | 'following-sibling' + * | 'namespace' + * | 'parent' + * | 'preceding' + * | 'preceding-sibling' + * | 'self' + * + * Returns the axis or 0 + */ +static xmlXPathAxisVal +xmlXPathIsAxisName(const xmlChar *name) { + xmlXPathAxisVal ret = (xmlXPathAxisVal) 0; + switch (name[0]) { + case 'a': + if (xmlStrEqual(name, BAD_CAST "ancestor")) + ret = AXIS_ANCESTOR; + if (xmlStrEqual(name, BAD_CAST "ancestor-or-self")) + ret = AXIS_ANCESTOR_OR_SELF; + if (xmlStrEqual(name, BAD_CAST "attribute")) + ret = AXIS_ATTRIBUTE; + break; + case 'c': + if (xmlStrEqual(name, BAD_CAST "child")) + ret = AXIS_CHILD; + break; + case 'd': + if (xmlStrEqual(name, BAD_CAST "descendant")) + ret = AXIS_DESCENDANT; + if (xmlStrEqual(name, BAD_CAST "descendant-or-self")) + ret = AXIS_DESCENDANT_OR_SELF; + break; + case 'f': + if (xmlStrEqual(name, BAD_CAST "following")) + ret = AXIS_FOLLOWING; + if (xmlStrEqual(name, BAD_CAST "following-sibling")) + ret = AXIS_FOLLOWING_SIBLING; + break; + case 'n': + if (xmlStrEqual(name, BAD_CAST "namespace")) + ret = AXIS_NAMESPACE; + break; + case 'p': + if (xmlStrEqual(name, BAD_CAST "parent")) + ret = AXIS_PARENT; + if (xmlStrEqual(name, BAD_CAST "preceding")) + ret = AXIS_PRECEDING; + if (xmlStrEqual(name, BAD_CAST "preceding-sibling")) + ret = AXIS_PRECEDING_SIBLING; + break; + case 's': + if (xmlStrEqual(name, BAD_CAST "self")) + ret = AXIS_SELF; + break; + } + return(ret); +} + +/** + * xmlXPathCompStep: + * @ctxt: the XPath Parser context + * + * [4] Step ::= AxisSpecifier NodeTest Predicate* + * | AbbreviatedStep + * + * [12] AbbreviatedStep ::= '.' | '..' + * + * [5] AxisSpecifier ::= AxisName '::' + * | AbbreviatedAxisSpecifier + * + * [13] AbbreviatedAxisSpecifier ::= '@'? + * + * Modified for XPtr range support as: + * + * [4xptr] Step ::= AxisSpecifier NodeTest Predicate* + * | AbbreviatedStep + * | 'range-to' '(' Expr ')' Predicate* + * + * Compile one step in a Location Path + * A location step of . is short for self::node(). This is + * particularly useful in conjunction with //. For example, the + * location path .//para is short for + * self::node()/descendant-or-self::node()/child::para + * and so will select all para descendant elements of the context + * node. + * Similarly, a location step of .. is short for parent::node(). + * For example, ../title is short for parent::node()/child::title + * and so will select the title children of the parent of the context + * node. + */ +static void +xmlXPathCompStep(xmlXPathParserContextPtr ctxt) { +#ifdef LIBXML_XPTR_ENABLED + int rangeto = 0; + int op2 = -1; +#endif + + SKIP_BLANKS; + if ((CUR == '.') && (NXT(1) == '.')) { + SKIP(2); + SKIP_BLANKS; + PUSH_LONG_EXPR(XPATH_OP_COLLECT, AXIS_PARENT, + NODE_TEST_TYPE, NODE_TYPE_NODE, NULL, NULL); + } else if (CUR == '.') { + NEXT; + SKIP_BLANKS; + } else { + xmlChar *name = NULL; + const xmlChar *prefix = NULL; + xmlXPathTestVal test = (xmlXPathTestVal) 0; + xmlXPathAxisVal axis = (xmlXPathAxisVal) 0; + xmlXPathTypeVal type = (xmlXPathTypeVal) 0; + int op1; + + /* + * The modification needed for XPointer change to the production + */ +#ifdef LIBXML_XPTR_ENABLED + if (ctxt->xptr) { + name = xmlXPathParseNCName(ctxt); + if ((name != NULL) && (xmlStrEqual(name, BAD_CAST "range-to"))) { + op2 = ctxt->comp->last; + xmlFree(name); + SKIP_BLANKS; + if (CUR != '(') { + XP_ERROR(XPATH_EXPR_ERROR); + } + NEXT; + SKIP_BLANKS; + + xmlXPathCompileExpr(ctxt, 1); + /* PUSH_BINARY_EXPR(XPATH_OP_RANGETO, op2, ctxt->comp->last, 0, 0); */ + CHECK_ERROR; + + SKIP_BLANKS; + if (CUR != ')') { + XP_ERROR(XPATH_EXPR_ERROR); + } + NEXT; + rangeto = 1; + goto eval_predicates; + } + } +#endif + if (CUR == '*') { + axis = AXIS_CHILD; + } else { + if (name == NULL) + name = xmlXPathParseNCName(ctxt); + if (name != NULL) { + axis = xmlXPathIsAxisName(name); + if (axis != 0) { + SKIP_BLANKS; + if ((CUR == ':') && (NXT(1) == ':')) { + SKIP(2); + xmlFree(name); + name = NULL; + } else { + /* an element name can conflict with an axis one :-\ */ + axis = AXIS_CHILD; + } + } else { + axis = AXIS_CHILD; + } + } else if (CUR == '@') { + NEXT; + axis = AXIS_ATTRIBUTE; + } else { + axis = AXIS_CHILD; + } + } + + if (ctxt->error != XPATH_EXPRESSION_OK) { + xmlFree(name); + return; + } + + name = xmlXPathCompNodeTest(ctxt, &test, &type, &prefix, name); + if (test == 0) + return; + + if ((prefix != NULL) && (ctxt->context != NULL) && + (ctxt->context->flags & XML_XPATH_CHECKNS)) { + if (xmlXPathNsLookup(ctxt->context, prefix) == NULL) { + xmlXPathErr(ctxt, XPATH_UNDEF_PREFIX_ERROR); + } + } +#ifdef DEBUG_STEP + xmlGenericError(xmlGenericErrorContext, + "Basis : computing new set\n"); +#endif + +#ifdef DEBUG_STEP + xmlGenericError(xmlGenericErrorContext, "Basis : "); + if (ctxt->value == NULL) + xmlGenericError(xmlGenericErrorContext, "no value\n"); + else if (ctxt->value->nodesetval == NULL) + xmlGenericError(xmlGenericErrorContext, "Empty\n"); + else + xmlGenericErrorContextNodeSet(stdout, ctxt->value->nodesetval); +#endif + +#ifdef LIBXML_XPTR_ENABLED +eval_predicates: +#endif + op1 = ctxt->comp->last; + ctxt->comp->last = -1; + + SKIP_BLANKS; + while (CUR == '[') { + xmlXPathCompPredicate(ctxt, 0); + } + +#ifdef LIBXML_XPTR_ENABLED + if (rangeto) { + PUSH_BINARY_EXPR(XPATH_OP_RANGETO, op2, op1, 0, 0); + } else +#endif + PUSH_FULL_EXPR(XPATH_OP_COLLECT, op1, ctxt->comp->last, axis, + test, type, (void *)prefix, (void *)name); + + } +#ifdef DEBUG_STEP + xmlGenericError(xmlGenericErrorContext, "Step : "); + if (ctxt->value == NULL) + xmlGenericError(xmlGenericErrorContext, "no value\n"); + else if (ctxt->value->nodesetval == NULL) + xmlGenericError(xmlGenericErrorContext, "Empty\n"); + else + xmlGenericErrorContextNodeSet(xmlGenericErrorContext, + ctxt->value->nodesetval); +#endif +} + +/** + * xmlXPathCompRelativeLocationPath: + * @ctxt: the XPath Parser context + * + * [3] RelativeLocationPath ::= Step + * | RelativeLocationPath '/' Step + * | AbbreviatedRelativeLocationPath + * [11] AbbreviatedRelativeLocationPath ::= RelativeLocationPath '//' Step + * + * Compile a relative location path. + */ +static void +xmlXPathCompRelativeLocationPath +(xmlXPathParserContextPtr ctxt) { + SKIP_BLANKS; + if ((CUR == '/') && (NXT(1) == '/')) { + SKIP(2); + SKIP_BLANKS; + PUSH_LONG_EXPR(XPATH_OP_COLLECT, AXIS_DESCENDANT_OR_SELF, + NODE_TEST_TYPE, NODE_TYPE_NODE, NULL, NULL); + } else if (CUR == '/') { + NEXT; + SKIP_BLANKS; + } + xmlXPathCompStep(ctxt); + CHECK_ERROR; + SKIP_BLANKS; + while (CUR == '/') { + if ((CUR == '/') && (NXT(1) == '/')) { + SKIP(2); + SKIP_BLANKS; + PUSH_LONG_EXPR(XPATH_OP_COLLECT, AXIS_DESCENDANT_OR_SELF, + NODE_TEST_TYPE, NODE_TYPE_NODE, NULL, NULL); + xmlXPathCompStep(ctxt); + } else if (CUR == '/') { + NEXT; + SKIP_BLANKS; + xmlXPathCompStep(ctxt); + } + SKIP_BLANKS; + } +} + +/** + * xmlXPathCompLocationPath: + * @ctxt: the XPath Parser context + * + * [1] LocationPath ::= RelativeLocationPath + * | AbsoluteLocationPath + * [2] AbsoluteLocationPath ::= '/' RelativeLocationPath? + * | AbbreviatedAbsoluteLocationPath + * [10] AbbreviatedAbsoluteLocationPath ::= + * '//' RelativeLocationPath + * + * Compile a location path + * + * // is short for /descendant-or-self::node()/. For example, + * //para is short for /descendant-or-self::node()/child::para and + * so will select any para element in the document (even a para element + * that is a document element will be selected by //para since the + * document element node is a child of the root node); div//para is + * short for div/descendant-or-self::node()/child::para and so will + * select all para descendants of div children. + */ +static void +xmlXPathCompLocationPath(xmlXPathParserContextPtr ctxt) { + SKIP_BLANKS; + if (CUR != '/') { + xmlXPathCompRelativeLocationPath(ctxt); + } else { + while (CUR == '/') { + if ((CUR == '/') && (NXT(1) == '/')) { + SKIP(2); + SKIP_BLANKS; + PUSH_LONG_EXPR(XPATH_OP_COLLECT, AXIS_DESCENDANT_OR_SELF, + NODE_TEST_TYPE, NODE_TYPE_NODE, NULL, NULL); + xmlXPathCompRelativeLocationPath(ctxt); + } else if (CUR == '/') { + NEXT; + SKIP_BLANKS; + if ((CUR != 0 ) && + ((IS_ASCII_LETTER(CUR)) || (CUR == '_') || (CUR == '.') || + (CUR == '@') || (CUR == '*'))) + xmlXPathCompRelativeLocationPath(ctxt); + } + CHECK_ERROR; + } + } +} + +/************************************************************************ + * * + * XPath precompiled expression evaluation * + * * + ************************************************************************/ + +static int +xmlXPathCompOpEval(xmlXPathParserContextPtr ctxt, xmlXPathStepOpPtr op); + +#ifdef DEBUG_STEP +static void +xmlXPathDebugDumpStepAxis(xmlXPathStepOpPtr op, + int nbNodes) +{ + xmlGenericError(xmlGenericErrorContext, "new step : "); + switch (op->value) { + case AXIS_ANCESTOR: + xmlGenericError(xmlGenericErrorContext, "axis 'ancestors' "); + break; + case AXIS_ANCESTOR_OR_SELF: + xmlGenericError(xmlGenericErrorContext, + "axis 'ancestors-or-self' "); + break; + case AXIS_ATTRIBUTE: + xmlGenericError(xmlGenericErrorContext, "axis 'attributes' "); + break; + case AXIS_CHILD: + xmlGenericError(xmlGenericErrorContext, "axis 'child' "); + break; + case AXIS_DESCENDANT: + xmlGenericError(xmlGenericErrorContext, "axis 'descendant' "); + break; + case AXIS_DESCENDANT_OR_SELF: + xmlGenericError(xmlGenericErrorContext, + "axis 'descendant-or-self' "); + break; + case AXIS_FOLLOWING: + xmlGenericError(xmlGenericErrorContext, "axis 'following' "); + break; + case AXIS_FOLLOWING_SIBLING: + xmlGenericError(xmlGenericErrorContext, + "axis 'following-siblings' "); + break; + case AXIS_NAMESPACE: + xmlGenericError(xmlGenericErrorContext, "axis 'namespace' "); + break; + case AXIS_PARENT: + xmlGenericError(xmlGenericErrorContext, "axis 'parent' "); + break; + case AXIS_PRECEDING: + xmlGenericError(xmlGenericErrorContext, "axis 'preceding' "); + break; + case AXIS_PRECEDING_SIBLING: + xmlGenericError(xmlGenericErrorContext, + "axis 'preceding-sibling' "); + break; + case AXIS_SELF: + xmlGenericError(xmlGenericErrorContext, "axis 'self' "); + break; + } + xmlGenericError(xmlGenericErrorContext, + " context contains %d nodes\n", nbNodes); + switch (op->value2) { + case NODE_TEST_NONE: + xmlGenericError(xmlGenericErrorContext, + " searching for none !!!\n"); + break; + case NODE_TEST_TYPE: + xmlGenericError(xmlGenericErrorContext, + " searching for type %d\n", op->value3); + break; + case NODE_TEST_PI: + xmlGenericError(xmlGenericErrorContext, + " searching for PI !!!\n"); + break; + case NODE_TEST_ALL: + xmlGenericError(xmlGenericErrorContext, + " searching for *\n"); + break; + case NODE_TEST_NS: + xmlGenericError(xmlGenericErrorContext, + " searching for namespace %s\n", + op->value5); + break; + case NODE_TEST_NAME: + xmlGenericError(xmlGenericErrorContext, + " searching for name %s\n", op->value5); + if (op->value4) + xmlGenericError(xmlGenericErrorContext, + " with namespace %s\n", op->value4); + break; + } + xmlGenericError(xmlGenericErrorContext, "Testing : "); +} +#endif /* DEBUG_STEP */ + +static int +xmlXPathCompOpEvalPredicate(xmlXPathParserContextPtr ctxt, + xmlXPathStepOpPtr op, + xmlNodeSetPtr set, + int contextSize, + int hasNsNodes) +{ + if (op->ch1 != -1) { + xmlXPathCompExprPtr comp = ctxt->comp; + /* + * Process inner predicates first. + */ + if (comp->steps[op->ch1].op != XPATH_OP_PREDICATE) { + /* + * TODO: raise an internal error. + */ + } + contextSize = xmlXPathCompOpEvalPredicate(ctxt, + &comp->steps[op->ch1], set, contextSize, hasNsNodes); + CHECK_ERROR0; + if (contextSize <= 0) + return(0); + } + if (op->ch2 != -1) { + xmlXPathContextPtr xpctxt = ctxt->context; + xmlNodePtr contextNode, oldContextNode; + xmlDocPtr oldContextDoc; + int i, res, contextPos = 0, newContextSize; + xmlXPathStepOpPtr exprOp; + xmlXPathObjectPtr contextObj = NULL, exprRes = NULL; + +#ifdef LIBXML_XPTR_ENABLED + /* + * URGENT TODO: Check the following: + * We don't expect location sets if evaluating prediates, right? + * Only filters should expect location sets, right? + */ +#endif + /* + * SPEC XPath 1.0: + * "For each node in the node-set to be filtered, the + * PredicateExpr is evaluated with that node as the + * context node, with the number of nodes in the + * node-set as the context size, and with the proximity + * position of the node in the node-set with respect to + * the axis as the context position;" + * @oldset is the node-set" to be filtered. + * + * SPEC XPath 1.0: + * "only predicates change the context position and + * context size (see [2.4 Predicates])." + * Example: + * node-set context pos + * nA 1 + * nB 2 + * nC 3 + * After applying predicate [position() > 1] : + * node-set context pos + * nB 1 + * nC 2 + */ + oldContextNode = xpctxt->node; + oldContextDoc = xpctxt->doc; + /* + * Get the expression of this predicate. + */ + exprOp = &ctxt->comp->steps[op->ch2]; + newContextSize = 0; + for (i = 0; i < set->nodeNr; i++) { + if (set->nodeTab[i] == NULL) + continue; + + contextNode = set->nodeTab[i]; + xpctxt->node = contextNode; + xpctxt->contextSize = contextSize; + xpctxt->proximityPosition = ++contextPos; + + /* + * Also set the xpath document in case things like + * key() are evaluated in the predicate. + */ + if ((contextNode->type != XML_NAMESPACE_DECL) && + (contextNode->doc != NULL)) + xpctxt->doc = contextNode->doc; + /* + * Evaluate the predicate expression with 1 context node + * at a time; this node is packaged into a node set; this + * node set is handed over to the evaluation mechanism. + */ + if (contextObj == NULL) + contextObj = xmlXPathCacheNewNodeSet(xpctxt, contextNode); + else { + if (xmlXPathNodeSetAddUnique(contextObj->nodesetval, + contextNode) < 0) { + ctxt->error = XPATH_MEMORY_ERROR; + goto evaluation_exit; + } + } + + valuePush(ctxt, contextObj); + + res = xmlXPathCompOpEvalToBoolean(ctxt, exprOp, 1); + + if ((ctxt->error != XPATH_EXPRESSION_OK) || (res == -1)) { + xmlXPathNodeSetClear(set, hasNsNodes); + newContextSize = 0; + goto evaluation_exit; + } + + if (res != 0) { + newContextSize++; + } else { + /* + * Remove the entry from the initial node set. + */ + set->nodeTab[i] = NULL; + if (contextNode->type == XML_NAMESPACE_DECL) + xmlXPathNodeSetFreeNs((xmlNsPtr) contextNode); + } + if (ctxt->value == contextObj) { + /* + * Don't free the temporary XPath object holding the + * context node, in order to avoid massive recreation + * inside this loop. + */ + valuePop(ctxt); + xmlXPathNodeSetClear(contextObj->nodesetval, hasNsNodes); + } else { + /* + * TODO: The object was lost in the evaluation machinery. + * Can this happen? Maybe in internal-error cases. + */ + contextObj = NULL; + } + } + + if (contextObj != NULL) { + if (ctxt->value == contextObj) + valuePop(ctxt); + xmlXPathReleaseObject(xpctxt, contextObj); + } +evaluation_exit: + if (exprRes != NULL) + xmlXPathReleaseObject(ctxt->context, exprRes); + /* + * Reset/invalidate the context. + */ + xpctxt->node = oldContextNode; + xpctxt->doc = oldContextDoc; + xpctxt->contextSize = -1; + xpctxt->proximityPosition = -1; + return(newContextSize); + } + return(contextSize); +} + +static int +xmlXPathCompOpEvalPositionalPredicate(xmlXPathParserContextPtr ctxt, + xmlXPathStepOpPtr op, + xmlNodeSetPtr set, + int contextSize, + int minPos, + int maxPos, + int hasNsNodes) +{ + if (op->ch1 != -1) { + xmlXPathCompExprPtr comp = ctxt->comp; + if (comp->steps[op->ch1].op != XPATH_OP_PREDICATE) { + /* + * TODO: raise an internal error. + */ + } + contextSize = xmlXPathCompOpEvalPredicate(ctxt, + &comp->steps[op->ch1], set, contextSize, hasNsNodes); + CHECK_ERROR0; + if (contextSize <= 0) + return(0); + } + /* + * Check if the node set contains a sufficient number of nodes for + * the requested range. + */ + if (contextSize < minPos) { + xmlXPathNodeSetClear(set, hasNsNodes); + return(0); + } + if (op->ch2 == -1) { + /* + * TODO: Can this ever happen? + */ + return (contextSize); + } else { + xmlDocPtr oldContextDoc; + int i, pos = 0, newContextSize = 0, contextPos = 0, res; + xmlXPathStepOpPtr exprOp; + xmlXPathObjectPtr contextObj = NULL, exprRes = NULL; + xmlNodePtr oldContextNode, contextNode = NULL; + xmlXPathContextPtr xpctxt = ctxt->context; + int frame; + +#ifdef LIBXML_XPTR_ENABLED + /* + * URGENT TODO: Check the following: + * We don't expect location sets if evaluating prediates, right? + * Only filters should expect location sets, right? + */ +#endif /* LIBXML_XPTR_ENABLED */ + + /* + * Save old context. + */ + oldContextNode = xpctxt->node; + oldContextDoc = xpctxt->doc; + /* + * Get the expression of this predicate. + */ + exprOp = &ctxt->comp->steps[op->ch2]; + for (i = 0; i < set->nodeNr; i++) { + xmlXPathObjectPtr tmp; + + if (set->nodeTab[i] == NULL) + continue; + + contextNode = set->nodeTab[i]; + xpctxt->node = contextNode; + xpctxt->contextSize = contextSize; + xpctxt->proximityPosition = ++contextPos; + + /* + * Initialize the new set. + * Also set the xpath document in case things like + * key() evaluation are attempted on the predicate + */ + if ((contextNode->type != XML_NAMESPACE_DECL) && + (contextNode->doc != NULL)) + xpctxt->doc = contextNode->doc; + /* + * Evaluate the predicate expression with 1 context node + * at a time; this node is packaged into a node set; this + * node set is handed over to the evaluation mechanism. + */ + if (contextObj == NULL) + contextObj = xmlXPathCacheNewNodeSet(xpctxt, contextNode); + else { + if (xmlXPathNodeSetAddUnique(contextObj->nodesetval, + contextNode) < 0) { + ctxt->error = XPATH_MEMORY_ERROR; + goto evaluation_exit; + } + } + + frame = xmlXPathSetFrame(ctxt); + valuePush(ctxt, contextObj); + res = xmlXPathCompOpEvalToBoolean(ctxt, exprOp, 1); + tmp = valuePop(ctxt); + xmlXPathPopFrame(ctxt, frame); + + if ((ctxt->error != XPATH_EXPRESSION_OK) || (res == -1)) { + while (tmp != contextObj) { + /* + * Free up the result + * then pop off contextObj, which will be freed later + */ + xmlXPathReleaseObject(xpctxt, tmp); + tmp = valuePop(ctxt); + } + goto evaluation_error; + } + /* push the result back onto the stack */ + valuePush(ctxt, tmp); + + if (res) + pos++; + + if (res && (pos >= minPos) && (pos <= maxPos)) { + /* + * Fits in the requested range. + */ + newContextSize++; + if (minPos == maxPos) { + /* + * Only 1 node was requested. + */ + if (contextNode->type == XML_NAMESPACE_DECL) { + /* + * As always: take care of those nasty + * namespace nodes. + */ + set->nodeTab[i] = NULL; + } + xmlXPathNodeSetClear(set, hasNsNodes); + set->nodeNr = 1; + set->nodeTab[0] = contextNode; + goto evaluation_exit; + } + if (pos == maxPos) { + /* + * We are done. + */ + xmlXPathNodeSetClearFromPos(set, i +1, hasNsNodes); + goto evaluation_exit; + } + } else { + /* + * Remove the entry from the initial node set. + */ + set->nodeTab[i] = NULL; + if (contextNode->type == XML_NAMESPACE_DECL) + xmlXPathNodeSetFreeNs((xmlNsPtr) contextNode); + } + if (exprRes != NULL) { + xmlXPathReleaseObject(ctxt->context, exprRes); + exprRes = NULL; + } + if (ctxt->value == contextObj) { + /* + * Don't free the temporary XPath object holding the + * context node, in order to avoid massive recreation + * inside this loop. + */ + valuePop(ctxt); + xmlXPathNodeSetClear(contextObj->nodesetval, hasNsNodes); + } else { + /* + * The object was lost in the evaluation machinery. + * Can this happen? Maybe in case of internal-errors. + */ + contextObj = NULL; + } + } + goto evaluation_exit; + +evaluation_error: + xmlXPathNodeSetClear(set, hasNsNodes); + newContextSize = 0; + +evaluation_exit: + if (contextObj != NULL) { + if (ctxt->value == contextObj) + valuePop(ctxt); + xmlXPathReleaseObject(xpctxt, contextObj); + } + if (exprRes != NULL) + xmlXPathReleaseObject(ctxt->context, exprRes); + /* + * Reset/invalidate the context. + */ + xpctxt->node = oldContextNode; + xpctxt->doc = oldContextDoc; + xpctxt->contextSize = -1; + xpctxt->proximityPosition = -1; + return(newContextSize); + } + return(contextSize); +} + +static int +xmlXPathIsPositionalPredicate(xmlXPathParserContextPtr ctxt, + xmlXPathStepOpPtr op, + int *maxPos) +{ + + xmlXPathStepOpPtr exprOp; + + /* + * BIG NOTE: This is not intended for XPATH_OP_FILTER yet! + */ + + /* + * If not -1, then ch1 will point to: + * 1) For predicates (XPATH_OP_PREDICATE): + * - an inner predicate operator + * 2) For filters (XPATH_OP_FILTER): + * - an inner filter operater OR + * - an expression selecting the node set. + * E.g. "key('a', 'b')" or "(//foo | //bar)". + */ + if ((op->op != XPATH_OP_PREDICATE) && (op->op != XPATH_OP_FILTER)) + return(0); + + if (op->ch2 != -1) { + exprOp = &ctxt->comp->steps[op->ch2]; + } else + return(0); + + if ((exprOp != NULL) && + (exprOp->op == XPATH_OP_VALUE) && + (exprOp->value4 != NULL) && + (((xmlXPathObjectPtr) exprOp->value4)->type == XPATH_NUMBER)) + { + /* + * We have a "[n]" predicate here. + * TODO: Unfortunately this simplistic test here is not + * able to detect a position() predicate in compound + * expressions like "[@attr = 'a" and position() = 1], + * and even not the usage of position() in + * "[position() = 1]"; thus - obviously - a position-range, + * like it "[position() < 5]", is also not detected. + * Maybe we could rewrite the AST to ease the optimization. + */ + *maxPos = (int) ((xmlXPathObjectPtr) exprOp->value4)->floatval; + + if (((xmlXPathObjectPtr) exprOp->value4)->floatval == + (float) *maxPos) + { + return(1); + } + } + return(0); +} + +static int +xmlXPathNodeCollectAndTest(xmlXPathParserContextPtr ctxt, + xmlXPathStepOpPtr op, + xmlNodePtr * first, xmlNodePtr * last, + int toBool) +{ + +#define XP_TEST_HIT \ + if (hasAxisRange != 0) { \ + if (++pos == maxPos) { \ + if (addNode(seq, cur) < 0) \ + ctxt->error = XPATH_MEMORY_ERROR; \ + goto axis_range_end; } \ + } else { \ + if (addNode(seq, cur) < 0) \ + ctxt->error = XPATH_MEMORY_ERROR; \ + if (breakOnFirstHit) goto first_hit; } + +#define XP_TEST_HIT_NS \ + if (hasAxisRange != 0) { \ + if (++pos == maxPos) { \ + hasNsNodes = 1; \ + if (xmlXPathNodeSetAddNs(seq, xpctxt->node, (xmlNsPtr) cur) < 0) \ + ctxt->error = XPATH_MEMORY_ERROR; \ + goto axis_range_end; } \ + } else { \ + hasNsNodes = 1; \ + if (xmlXPathNodeSetAddNs(seq, xpctxt->node, (xmlNsPtr) cur) < 0) \ + ctxt->error = XPATH_MEMORY_ERROR; \ + if (breakOnFirstHit) goto first_hit; } + + xmlXPathAxisVal axis = (xmlXPathAxisVal) op->value; + xmlXPathTestVal test = (xmlXPathTestVal) op->value2; + xmlXPathTypeVal type = (xmlXPathTypeVal) op->value3; + const xmlChar *prefix = op->value4; + const xmlChar *name = op->value5; + const xmlChar *URI = NULL; + +#ifdef DEBUG_STEP + int nbMatches = 0, prevMatches = 0; +#endif + int total = 0, hasNsNodes = 0; + /* The popped object holding the context nodes */ + xmlXPathObjectPtr obj; + /* The set of context nodes for the node tests */ + xmlNodeSetPtr contextSeq; + int contextIdx; + xmlNodePtr contextNode; + /* The final resulting node set wrt to all context nodes */ + xmlNodeSetPtr outSeq; + /* + * The temporary resulting node set wrt 1 context node. + * Used to feed predicate evaluation. + */ + xmlNodeSetPtr seq; + xmlNodePtr cur; + /* First predicate operator */ + xmlXPathStepOpPtr predOp; + int maxPos; /* The requested position() (when a "[n]" predicate) */ + int hasPredicateRange, hasAxisRange, pos, size, newSize; + int breakOnFirstHit; + + xmlXPathTraversalFunction next = NULL; + int (*addNode) (xmlNodeSetPtr, xmlNodePtr); + xmlXPathNodeSetMergeFunction mergeAndClear; + xmlNodePtr oldContextNode; + xmlXPathContextPtr xpctxt = ctxt->context; + + + CHECK_TYPE0(XPATH_NODESET); + obj = valuePop(ctxt); + /* + * Setup namespaces. + */ + if (prefix != NULL) { + URI = xmlXPathNsLookup(xpctxt, prefix); + if (URI == NULL) { + xmlXPathReleaseObject(xpctxt, obj); + XP_ERROR0(XPATH_UNDEF_PREFIX_ERROR); + } + } + /* + * Setup axis. + * + * MAYBE FUTURE TODO: merging optimizations: + * - If the nodes to be traversed wrt to the initial nodes and + * the current axis cannot overlap, then we could avoid searching + * for duplicates during the merge. + * But the question is how/when to evaluate if they cannot overlap. + * Example: if we know that for two initial nodes, the one is + * not in the ancestor-or-self axis of the other, then we could safely + * avoid a duplicate-aware merge, if the axis to be traversed is e.g. + * the descendant-or-self axis. + */ + mergeAndClear = xmlXPathNodeSetMergeAndClear; + switch (axis) { + case AXIS_ANCESTOR: + first = NULL; + next = xmlXPathNextAncestor; + break; + case AXIS_ANCESTOR_OR_SELF: + first = NULL; + next = xmlXPathNextAncestorOrSelf; + break; + case AXIS_ATTRIBUTE: + first = NULL; + last = NULL; + next = xmlXPathNextAttribute; + mergeAndClear = xmlXPathNodeSetMergeAndClearNoDupls; + break; + case AXIS_CHILD: + last = NULL; + if (((test == NODE_TEST_NAME) || (test == NODE_TEST_ALL)) && + (type == NODE_TYPE_NODE)) + { + /* + * Optimization if an element node type is 'element'. + */ + next = xmlXPathNextChildElement; + } else + next = xmlXPathNextChild; + mergeAndClear = xmlXPathNodeSetMergeAndClearNoDupls; + break; + case AXIS_DESCENDANT: + last = NULL; + next = xmlXPathNextDescendant; + break; + case AXIS_DESCENDANT_OR_SELF: + last = NULL; + next = xmlXPathNextDescendantOrSelf; + break; + case AXIS_FOLLOWING: + last = NULL; + next = xmlXPathNextFollowing; + break; + case AXIS_FOLLOWING_SIBLING: + last = NULL; + next = xmlXPathNextFollowingSibling; + break; + case AXIS_NAMESPACE: + first = NULL; + last = NULL; + next = (xmlXPathTraversalFunction) xmlXPathNextNamespace; + mergeAndClear = xmlXPathNodeSetMergeAndClearNoDupls; + break; + case AXIS_PARENT: + first = NULL; + next = xmlXPathNextParent; + break; + case AXIS_PRECEDING: + first = NULL; + next = xmlXPathNextPrecedingInternal; + break; + case AXIS_PRECEDING_SIBLING: + first = NULL; + next = xmlXPathNextPrecedingSibling; + break; + case AXIS_SELF: + first = NULL; + last = NULL; + next = xmlXPathNextSelf; + mergeAndClear = xmlXPathNodeSetMergeAndClearNoDupls; + break; + } + +#ifdef DEBUG_STEP + xmlXPathDebugDumpStepAxis(op, + (obj->nodesetval != NULL) ? obj->nodesetval->nodeNr : 0); +#endif + + if (next == NULL) { + xmlXPathReleaseObject(xpctxt, obj); + return(0); + } + contextSeq = obj->nodesetval; + if ((contextSeq == NULL) || (contextSeq->nodeNr <= 0)) { + xmlXPathReleaseObject(xpctxt, obj); + valuePush(ctxt, xmlXPathCacheWrapNodeSet(xpctxt, NULL)); + return(0); + } + /* + * Predicate optimization --------------------------------------------- + * If this step has a last predicate, which contains a position(), + * then we'll optimize (although not exactly "position()", but only + * the short-hand form, i.e., "[n]". + * + * Example - expression "/foo[parent::bar][1]": + * + * COLLECT 'child' 'name' 'node' foo -- op (we are here) + * ROOT -- op->ch1 + * PREDICATE -- op->ch2 (predOp) + * PREDICATE -- predOp->ch1 = [parent::bar] + * SORT + * COLLECT 'parent' 'name' 'node' bar + * NODE + * ELEM Object is a number : 1 -- predOp->ch2 = [1] + * + */ + maxPos = 0; + predOp = NULL; + hasPredicateRange = 0; + hasAxisRange = 0; + if (op->ch2 != -1) { + /* + * There's at least one predicate. 16 == XPATH_OP_PREDICATE + */ + predOp = &ctxt->comp->steps[op->ch2]; + if (xmlXPathIsPositionalPredicate(ctxt, predOp, &maxPos)) { + if (predOp->ch1 != -1) { + /* + * Use the next inner predicate operator. + */ + predOp = &ctxt->comp->steps[predOp->ch1]; + hasPredicateRange = 1; + } else { + /* + * There's no other predicate than the [n] predicate. + */ + predOp = NULL; + hasAxisRange = 1; + } + } + } + breakOnFirstHit = ((toBool) && (predOp == NULL)) ? 1 : 0; + /* + * Axis traversal ----------------------------------------------------- + */ + /* + * 2.3 Node Tests + * - For the attribute axis, the principal node type is attribute. + * - For the namespace axis, the principal node type is namespace. + * - For other axes, the principal node type is element. + * + * A node test * is true for any node of the + * principal node type. For example, child::* will + * select all element children of the context node + */ + oldContextNode = xpctxt->node; + addNode = xmlXPathNodeSetAddUnique; + outSeq = NULL; + seq = NULL; + contextNode = NULL; + contextIdx = 0; + + + while (((contextIdx < contextSeq->nodeNr) || (contextNode != NULL)) && + (ctxt->error == XPATH_EXPRESSION_OK)) { + xpctxt->node = contextSeq->nodeTab[contextIdx++]; + + if (seq == NULL) { + seq = xmlXPathNodeSetCreate(NULL); + if (seq == NULL) { + total = 0; + goto error; + } + } + /* + * Traverse the axis and test the nodes. + */ + pos = 0; + cur = NULL; + hasNsNodes = 0; + do { + cur = next(ctxt, cur); + if (cur == NULL) + break; + + /* + * QUESTION TODO: What does the "first" and "last" stuff do? + */ + if ((first != NULL) && (*first != NULL)) { + if (*first == cur) + break; + if (((total % 256) == 0) && +#ifdef XP_OPTIMIZED_NON_ELEM_COMPARISON + (xmlXPathCmpNodesExt(*first, cur) >= 0)) +#else + (xmlXPathCmpNodes(*first, cur) >= 0)) +#endif + { + break; + } + } + if ((last != NULL) && (*last != NULL)) { + if (*last == cur) + break; + if (((total % 256) == 0) && +#ifdef XP_OPTIMIZED_NON_ELEM_COMPARISON + (xmlXPathCmpNodesExt(cur, *last) >= 0)) +#else + (xmlXPathCmpNodes(cur, *last) >= 0)) +#endif + { + break; + } + } + + total++; + +#ifdef DEBUG_STEP + xmlGenericError(xmlGenericErrorContext, " %s", cur->name); +#endif + + switch (test) { + case NODE_TEST_NONE: + total = 0; + STRANGE + goto error; + case NODE_TEST_TYPE: + if (type == NODE_TYPE_NODE) { + switch (cur->type) { + case XML_DOCUMENT_NODE: + case XML_HTML_DOCUMENT_NODE: +#ifdef LIBXML_DOCB_ENABLED + case XML_DOCB_DOCUMENT_NODE: +#endif + case XML_ELEMENT_NODE: + case XML_ATTRIBUTE_NODE: + case XML_PI_NODE: + case XML_COMMENT_NODE: + case XML_CDATA_SECTION_NODE: + case XML_TEXT_NODE: + XP_TEST_HIT + break; + case XML_NAMESPACE_DECL: { + if (axis == AXIS_NAMESPACE) { + XP_TEST_HIT_NS + } else { + hasNsNodes = 1; + XP_TEST_HIT + } + break; + } + default: + break; + } + } else if (cur->type == type) { + if (cur->type == XML_NAMESPACE_DECL) + XP_TEST_HIT_NS + else + XP_TEST_HIT + } else if ((type == NODE_TYPE_TEXT) && + (cur->type == XML_CDATA_SECTION_NODE)) + { + XP_TEST_HIT + } + break; + case NODE_TEST_PI: + if ((cur->type == XML_PI_NODE) && + ((name == NULL) || xmlStrEqual(name, cur->name))) + { + XP_TEST_HIT + } + break; + case NODE_TEST_ALL: + if (axis == AXIS_ATTRIBUTE) { + if (cur->type == XML_ATTRIBUTE_NODE) + { + if (prefix == NULL) + { + XP_TEST_HIT + } else if ((cur->ns != NULL) && + (xmlStrEqual(URI, cur->ns->href))) + { + XP_TEST_HIT + } + } + } else if (axis == AXIS_NAMESPACE) { + if (cur->type == XML_NAMESPACE_DECL) + { + XP_TEST_HIT_NS + } + } else { + if (cur->type == XML_ELEMENT_NODE) { + if (prefix == NULL) + { + XP_TEST_HIT + + } else if ((cur->ns != NULL) && + (xmlStrEqual(URI, cur->ns->href))) + { + XP_TEST_HIT + } + } + } + break; + case NODE_TEST_NS:{ + TODO; + break; + } + case NODE_TEST_NAME: + if (axis == AXIS_ATTRIBUTE) { + if (cur->type != XML_ATTRIBUTE_NODE) + break; + } else if (axis == AXIS_NAMESPACE) { + if (cur->type != XML_NAMESPACE_DECL) + break; + } else { + if (cur->type != XML_ELEMENT_NODE) + break; + } + switch (cur->type) { + case XML_ELEMENT_NODE: + if (xmlStrEqual(name, cur->name)) { + if (prefix == NULL) { + if (cur->ns == NULL) + { + XP_TEST_HIT + } + } else { + if ((cur->ns != NULL) && + (xmlStrEqual(URI, cur->ns->href))) + { + XP_TEST_HIT + } + } + } + break; + case XML_ATTRIBUTE_NODE:{ + xmlAttrPtr attr = (xmlAttrPtr) cur; + + if (xmlStrEqual(name, attr->name)) { + if (prefix == NULL) { + if ((attr->ns == NULL) || + (attr->ns->prefix == NULL)) + { + XP_TEST_HIT + } + } else { + if ((attr->ns != NULL) && + (xmlStrEqual(URI, + attr->ns->href))) + { + XP_TEST_HIT + } + } + } + break; + } + case XML_NAMESPACE_DECL: + if (cur->type == XML_NAMESPACE_DECL) { + xmlNsPtr ns = (xmlNsPtr) cur; + + if ((ns->prefix != NULL) && (name != NULL) + && (xmlStrEqual(ns->prefix, name))) + { + XP_TEST_HIT_NS + } + } + break; + default: + break; + } + break; + } /* switch(test) */ + } while ((cur != NULL) && (ctxt->error == XPATH_EXPRESSION_OK)); + + goto apply_predicates; + +axis_range_end: /* ----------------------------------------------------- */ + /* + * We have a "/foo[n]", and position() = n was reached. + * Note that we can have as well "/foo/::parent::foo[1]", so + * a duplicate-aware merge is still needed. + * Merge with the result. + */ + if (outSeq == NULL) { + outSeq = seq; + seq = NULL; + } else + outSeq = mergeAndClear(outSeq, seq, 0); + /* + * Break if only a true/false result was requested. + */ + if (toBool) + break; + continue; + +first_hit: /* ---------------------------------------------------------- */ + /* + * Break if only a true/false result was requested and + * no predicates existed and a node test succeeded. + */ + if (outSeq == NULL) { + outSeq = seq; + seq = NULL; + } else + outSeq = mergeAndClear(outSeq, seq, 0); + break; + +#ifdef DEBUG_STEP + if (seq != NULL) + nbMatches += seq->nodeNr; +#endif + +apply_predicates: /* --------------------------------------------------- */ + if (ctxt->error != XPATH_EXPRESSION_OK) + goto error; + + /* + * Apply predicates. + */ + if ((predOp != NULL) && (seq->nodeNr > 0)) { + /* + * E.g. when we have a "/foo[some expression][n]". + */ + /* + * QUESTION TODO: The old predicate evaluation took into + * account location-sets. + * (E.g. ctxt->value->type == XPATH_LOCATIONSET) + * Do we expect such a set here? + * All what I learned now from the evaluation semantics + * does not indicate that a location-set will be processed + * here, so this looks OK. + */ + /* + * Iterate over all predicates, starting with the outermost + * predicate. + * TODO: Problem: we cannot execute the inner predicates first + * since we cannot go back *up* the operator tree! + * Options we have: + * 1) Use of recursive functions (like is it currently done + * via xmlXPathCompOpEval()) + * 2) Add a predicate evaluation information stack to the + * context struct + * 3) Change the way the operators are linked; we need a + * "parent" field on xmlXPathStepOp + * + * For the moment, I'll try to solve this with a recursive + * function: xmlXPathCompOpEvalPredicate(). + */ + size = seq->nodeNr; + if (hasPredicateRange != 0) + newSize = xmlXPathCompOpEvalPositionalPredicate(ctxt, + predOp, seq, size, maxPos, maxPos, hasNsNodes); + else + newSize = xmlXPathCompOpEvalPredicate(ctxt, + predOp, seq, size, hasNsNodes); + + if (ctxt->error != XPATH_EXPRESSION_OK) { + total = 0; + goto error; + } + /* + * Add the filtered set of nodes to the result node set. + */ + if (newSize == 0) { + /* + * The predicates filtered all nodes out. + */ + xmlXPathNodeSetClear(seq, hasNsNodes); + } else if (seq->nodeNr > 0) { + /* + * Add to result set. + */ + if (outSeq == NULL) { + if (size != newSize) { + /* + * We need to merge and clear here, since + * the sequence will contained NULLed entries. + */ + outSeq = mergeAndClear(NULL, seq, 1); + } else { + outSeq = seq; + seq = NULL; + } + } else + outSeq = mergeAndClear(outSeq, seq, + (size != newSize) ? 1: 0); + /* + * Break if only a true/false result was requested. + */ + if (toBool) + break; + } + } else if (seq->nodeNr > 0) { + /* + * Add to result set. + */ + if (outSeq == NULL) { + outSeq = seq; + seq = NULL; + } else { + outSeq = mergeAndClear(outSeq, seq, 0); + } + } + } + +error: + if ((obj->boolval) && (obj->user != NULL)) { + /* + * QUESTION TODO: What does this do and why? + * TODO: Do we have to do this also for the "error" + * cleanup further down? + */ + ctxt->value->boolval = 1; + ctxt->value->user = obj->user; + obj->user = NULL; + obj->boolval = 0; + } + xmlXPathReleaseObject(xpctxt, obj); + + /* + * Ensure we return at least an emtpy set. + */ + if (outSeq == NULL) { + if ((seq != NULL) && (seq->nodeNr == 0)) + outSeq = seq; + else + outSeq = xmlXPathNodeSetCreate(NULL); + /* XXX what if xmlXPathNodeSetCreate returned NULL here? */ + } + if ((seq != NULL) && (seq != outSeq)) { + xmlXPathFreeNodeSet(seq); + } + /* + * Hand over the result. Better to push the set also in + * case of errors. + */ + valuePush(ctxt, xmlXPathCacheWrapNodeSet(xpctxt, outSeq)); + /* + * Reset the context node. + */ + xpctxt->node = oldContextNode; + /* + * When traversing the namespace axis in "toBool" mode, it's + * possible that tmpNsList wasn't freed. + */ + if (xpctxt->tmpNsList != NULL) { + xmlFree(xpctxt->tmpNsList); + xpctxt->tmpNsList = NULL; + } + +#ifdef DEBUG_STEP + xmlGenericError(xmlGenericErrorContext, + "\nExamined %d nodes, found %d nodes at that step\n", + total, nbMatches); +#endif + + return(total); +} + +static int +xmlXPathCompOpEvalFilterFirst(xmlXPathParserContextPtr ctxt, + xmlXPathStepOpPtr op, xmlNodePtr * first); + +/** + * xmlXPathCompOpEvalFirst: + * @ctxt: the XPath parser context with the compiled expression + * @op: an XPath compiled operation + * @first: the first elem found so far + * + * Evaluate the Precompiled XPath operation searching only the first + * element in document order + * + * Returns the number of examined objects. + */ +static int +xmlXPathCompOpEvalFirst(xmlXPathParserContextPtr ctxt, + xmlXPathStepOpPtr op, xmlNodePtr * first) +{ + int total = 0, cur; + xmlXPathCompExprPtr comp; + xmlXPathObjectPtr arg1, arg2; + + CHECK_ERROR0; + comp = ctxt->comp; + switch (op->op) { + case XPATH_OP_END: + return (0); + case XPATH_OP_UNION: + total = + xmlXPathCompOpEvalFirst(ctxt, &comp->steps[op->ch1], + first); + CHECK_ERROR0; + if ((ctxt->value != NULL) + && (ctxt->value->type == XPATH_NODESET) + && (ctxt->value->nodesetval != NULL) + && (ctxt->value->nodesetval->nodeNr >= 1)) { + /* + * limit tree traversing to first node in the result + */ + /* + * OPTIMIZE TODO: This implicitely sorts + * the result, even if not needed. E.g. if the argument + * of the count() function, no sorting is needed. + * OPTIMIZE TODO: How do we know if the node-list wasn't + * aready sorted? + */ + if (ctxt->value->nodesetval->nodeNr > 1) + xmlXPathNodeSetSort(ctxt->value->nodesetval); + *first = ctxt->value->nodesetval->nodeTab[0]; + } + cur = + xmlXPathCompOpEvalFirst(ctxt, &comp->steps[op->ch2], + first); + CHECK_ERROR0; + CHECK_TYPE0(XPATH_NODESET); + arg2 = valuePop(ctxt); + + CHECK_TYPE0(XPATH_NODESET); + arg1 = valuePop(ctxt); + + arg1->nodesetval = xmlXPathNodeSetMerge(arg1->nodesetval, + arg2->nodesetval); + valuePush(ctxt, arg1); + xmlXPathReleaseObject(ctxt->context, arg2); + /* optimizer */ + if (total > cur) + xmlXPathCompSwap(op); + return (total + cur); + case XPATH_OP_ROOT: + xmlXPathRoot(ctxt); + return (0); + case XPATH_OP_NODE: + if (op->ch1 != -1) + total += xmlXPathCompOpEval(ctxt, &comp->steps[op->ch1]); + CHECK_ERROR0; + if (op->ch2 != -1) + total += xmlXPathCompOpEval(ctxt, &comp->steps[op->ch2]); + CHECK_ERROR0; + valuePush(ctxt, xmlXPathCacheNewNodeSet(ctxt->context, + ctxt->context->node)); + return (total); + case XPATH_OP_RESET: + if (op->ch1 != -1) + total += xmlXPathCompOpEval(ctxt, &comp->steps[op->ch1]); + CHECK_ERROR0; + if (op->ch2 != -1) + total += xmlXPathCompOpEval(ctxt, &comp->steps[op->ch2]); + CHECK_ERROR0; + ctxt->context->node = NULL; + return (total); + case XPATH_OP_COLLECT:{ + if (op->ch1 == -1) + return (total); + + total = xmlXPathCompOpEval(ctxt, &comp->steps[op->ch1]); + CHECK_ERROR0; + + total += xmlXPathNodeCollectAndTest(ctxt, op, first, NULL, 0); + return (total); + } + case XPATH_OP_VALUE: + valuePush(ctxt, + xmlXPathCacheObjectCopy(ctxt->context, + (xmlXPathObjectPtr) op->value4)); + return (0); + case XPATH_OP_SORT: + if (op->ch1 != -1) + total += + xmlXPathCompOpEvalFirst(ctxt, &comp->steps[op->ch1], + first); + CHECK_ERROR0; + if ((ctxt->value != NULL) + && (ctxt->value->type == XPATH_NODESET) + && (ctxt->value->nodesetval != NULL) + && (ctxt->value->nodesetval->nodeNr > 1)) + xmlXPathNodeSetSort(ctxt->value->nodesetval); + return (total); +#ifdef XP_OPTIMIZED_FILTER_FIRST + case XPATH_OP_FILTER: + total += xmlXPathCompOpEvalFilterFirst(ctxt, op, first); + return (total); +#endif + default: + return (xmlXPathCompOpEval(ctxt, op)); + } +} + +/** + * xmlXPathCompOpEvalLast: + * @ctxt: the XPath parser context with the compiled expression + * @op: an XPath compiled operation + * @last: the last elem found so far + * + * Evaluate the Precompiled XPath operation searching only the last + * element in document order + * + * Returns the number of nodes traversed + */ +static int +xmlXPathCompOpEvalLast(xmlXPathParserContextPtr ctxt, xmlXPathStepOpPtr op, + xmlNodePtr * last) +{ + int total = 0, cur; + xmlXPathCompExprPtr comp; + xmlXPathObjectPtr arg1, arg2; + xmlNodePtr bak; + xmlDocPtr bakd; + int pp; + int cs; + + CHECK_ERROR0; + comp = ctxt->comp; + switch (op->op) { + case XPATH_OP_END: + return (0); + case XPATH_OP_UNION: + bakd = ctxt->context->doc; + bak = ctxt->context->node; + pp = ctxt->context->proximityPosition; + cs = ctxt->context->contextSize; + total = + xmlXPathCompOpEvalLast(ctxt, &comp->steps[op->ch1], last); + CHECK_ERROR0; + if ((ctxt->value != NULL) + && (ctxt->value->type == XPATH_NODESET) + && (ctxt->value->nodesetval != NULL) + && (ctxt->value->nodesetval->nodeNr >= 1)) { + /* + * limit tree traversing to first node in the result + */ + if (ctxt->value->nodesetval->nodeNr > 1) + xmlXPathNodeSetSort(ctxt->value->nodesetval); + *last = + ctxt->value->nodesetval->nodeTab[ctxt->value-> + nodesetval->nodeNr - + 1]; + } + ctxt->context->doc = bakd; + ctxt->context->node = bak; + ctxt->context->proximityPosition = pp; + ctxt->context->contextSize = cs; + cur = + xmlXPathCompOpEvalLast(ctxt, &comp->steps[op->ch2], last); + CHECK_ERROR0; + if ((ctxt->value != NULL) + && (ctxt->value->type == XPATH_NODESET) + && (ctxt->value->nodesetval != NULL) + && (ctxt->value->nodesetval->nodeNr >= 1)) { /* TODO: NOP ? */ + } + CHECK_TYPE0(XPATH_NODESET); + arg2 = valuePop(ctxt); + + CHECK_TYPE0(XPATH_NODESET); + arg1 = valuePop(ctxt); + + arg1->nodesetval = xmlXPathNodeSetMerge(arg1->nodesetval, + arg2->nodesetval); + valuePush(ctxt, arg1); + xmlXPathReleaseObject(ctxt->context, arg2); + /* optimizer */ + if (total > cur) + xmlXPathCompSwap(op); + return (total + cur); + case XPATH_OP_ROOT: + xmlXPathRoot(ctxt); + return (0); + case XPATH_OP_NODE: + if (op->ch1 != -1) + total += xmlXPathCompOpEval(ctxt, &comp->steps[op->ch1]); + CHECK_ERROR0; + if (op->ch2 != -1) + total += xmlXPathCompOpEval(ctxt, &comp->steps[op->ch2]); + CHECK_ERROR0; + valuePush(ctxt, xmlXPathCacheNewNodeSet(ctxt->context, + ctxt->context->node)); + return (total); + case XPATH_OP_RESET: + if (op->ch1 != -1) + total += xmlXPathCompOpEval(ctxt, &comp->steps[op->ch1]); + CHECK_ERROR0; + if (op->ch2 != -1) + total += xmlXPathCompOpEval(ctxt, &comp->steps[op->ch2]); + CHECK_ERROR0; + ctxt->context->node = NULL; + return (total); + case XPATH_OP_COLLECT:{ + if (op->ch1 == -1) + return (0); + + total += xmlXPathCompOpEval(ctxt, &comp->steps[op->ch1]); + CHECK_ERROR0; + + total += xmlXPathNodeCollectAndTest(ctxt, op, NULL, last, 0); + return (total); + } + case XPATH_OP_VALUE: + valuePush(ctxt, + xmlXPathCacheObjectCopy(ctxt->context, + (xmlXPathObjectPtr) op->value4)); + return (0); + case XPATH_OP_SORT: + if (op->ch1 != -1) + total += + xmlXPathCompOpEvalLast(ctxt, &comp->steps[op->ch1], + last); + CHECK_ERROR0; + if ((ctxt->value != NULL) + && (ctxt->value->type == XPATH_NODESET) + && (ctxt->value->nodesetval != NULL) + && (ctxt->value->nodesetval->nodeNr > 1)) + xmlXPathNodeSetSort(ctxt->value->nodesetval); + return (total); + default: + return (xmlXPathCompOpEval(ctxt, op)); + } +} + +#ifdef XP_OPTIMIZED_FILTER_FIRST +static int +xmlXPathCompOpEvalFilterFirst(xmlXPathParserContextPtr ctxt, + xmlXPathStepOpPtr op, xmlNodePtr * first) +{ + int total = 0; + xmlXPathCompExprPtr comp; + xmlXPathObjectPtr res; + xmlXPathObjectPtr obj; + xmlNodeSetPtr oldset; + xmlNodePtr oldnode; + xmlDocPtr oldDoc; + int i; + + CHECK_ERROR0; + comp = ctxt->comp; + /* + * Optimization for ()[last()] selection i.e. the last elem + */ + if ((op->ch1 != -1) && (op->ch2 != -1) && + (comp->steps[op->ch1].op == XPATH_OP_SORT) && + (comp->steps[op->ch2].op == XPATH_OP_SORT)) { + int f = comp->steps[op->ch2].ch1; + + if ((f != -1) && + (comp->steps[f].op == XPATH_OP_FUNCTION) && + (comp->steps[f].value5 == NULL) && + (comp->steps[f].value == 0) && + (comp->steps[f].value4 != NULL) && + (xmlStrEqual + (comp->steps[f].value4, BAD_CAST "last"))) { + xmlNodePtr last = NULL; + + total += + xmlXPathCompOpEvalLast(ctxt, + &comp->steps[op->ch1], + &last); + CHECK_ERROR0; + /* + * The nodeset should be in document order, + * Keep only the last value + */ + if ((ctxt->value != NULL) && + (ctxt->value->type == XPATH_NODESET) && + (ctxt->value->nodesetval != NULL) && + (ctxt->value->nodesetval->nodeTab != NULL) && + (ctxt->value->nodesetval->nodeNr > 1)) { + ctxt->value->nodesetval->nodeTab[0] = + ctxt->value->nodesetval->nodeTab[ctxt-> + value-> + nodesetval-> + nodeNr - + 1]; + ctxt->value->nodesetval->nodeNr = 1; + *first = *(ctxt->value->nodesetval->nodeTab); + } + return (total); + } + } + + if (op->ch1 != -1) + total += xmlXPathCompOpEval(ctxt, &comp->steps[op->ch1]); + CHECK_ERROR0; + if (op->ch2 == -1) + return (total); + if (ctxt->value == NULL) + return (total); + +#ifdef LIBXML_XPTR_ENABLED + oldnode = ctxt->context->node; + /* + * Hum are we filtering the result of an XPointer expression + */ + if (ctxt->value->type == XPATH_LOCATIONSET) { + xmlXPathObjectPtr tmp = NULL; + xmlLocationSetPtr newlocset = NULL; + xmlLocationSetPtr oldlocset; + + /* + * Extract the old locset, and then evaluate the result of the + * expression for all the element in the locset. use it to grow + * up a new locset. + */ + CHECK_TYPE0(XPATH_LOCATIONSET); + obj = valuePop(ctxt); + oldlocset = obj->user; + ctxt->context->node = NULL; + + if ((oldlocset == NULL) || (oldlocset->locNr == 0)) { + ctxt->context->contextSize = 0; + ctxt->context->proximityPosition = 0; + if (op->ch2 != -1) + total += xmlXPathCompOpEval(ctxt, &comp->steps[op->ch2]); + res = valuePop(ctxt); + if (res != NULL) { + xmlXPathReleaseObject(ctxt->context, res); + } + valuePush(ctxt, obj); + CHECK_ERROR0; + return (total); + } + newlocset = xmlXPtrLocationSetCreate(NULL); + + for (i = 0; i < oldlocset->locNr; i++) { + /* + * Run the evaluation with a node list made of a + * single item in the nodelocset. + */ + ctxt->context->node = oldlocset->locTab[i]->user; + ctxt->context->contextSize = oldlocset->locNr; + ctxt->context->proximityPosition = i + 1; + if (tmp == NULL) { + tmp = xmlXPathCacheNewNodeSet(ctxt->context, + ctxt->context->node); + } else { + if (xmlXPathNodeSetAddUnique(tmp->nodesetval, + ctxt->context->node) < 0) { + ctxt->error = XPATH_MEMORY_ERROR; + } + } + valuePush(ctxt, tmp); + if (op->ch2 != -1) + total += xmlXPathCompOpEval(ctxt, &comp->steps[op->ch2]); + if (ctxt->error != XPATH_EXPRESSION_OK) { + xmlXPathFreeObject(obj); + return(0); + } + /* + * The result of the evaluation need to be tested to + * decided whether the filter succeeded or not + */ + res = valuePop(ctxt); + if (xmlXPathEvaluatePredicateResult(ctxt, res)) { + xmlXPtrLocationSetAdd(newlocset, + xmlXPathCacheObjectCopy(ctxt->context, + oldlocset->locTab[i])); + } + /* + * Cleanup + */ + if (res != NULL) { + xmlXPathReleaseObject(ctxt->context, res); + } + if (ctxt->value == tmp) { + valuePop(ctxt); + xmlXPathNodeSetClear(tmp->nodesetval, 1); + /* + * REVISIT TODO: Don't create a temporary nodeset + * for everly iteration. + */ + /* OLD: xmlXPathFreeObject(res); */ + } else + tmp = NULL; + ctxt->context->node = NULL; + /* + * Only put the first node in the result, then leave. + */ + if (newlocset->locNr > 0) { + *first = (xmlNodePtr) oldlocset->locTab[i]->user; + break; + } + } + if (tmp != NULL) { + xmlXPathReleaseObject(ctxt->context, tmp); + } + /* + * The result is used as the new evaluation locset. + */ + xmlXPathReleaseObject(ctxt->context, obj); + ctxt->context->node = NULL; + ctxt->context->contextSize = -1; + ctxt->context->proximityPosition = -1; + valuePush(ctxt, xmlXPtrWrapLocationSet(newlocset)); + ctxt->context->node = oldnode; + return (total); + } +#endif /* LIBXML_XPTR_ENABLED */ + + /* + * Extract the old set, and then evaluate the result of the + * expression for all the element in the set. use it to grow + * up a new set. + */ + CHECK_TYPE0(XPATH_NODESET); + obj = valuePop(ctxt); + oldset = obj->nodesetval; + + oldnode = ctxt->context->node; + oldDoc = ctxt->context->doc; + ctxt->context->node = NULL; + + if ((oldset == NULL) || (oldset->nodeNr == 0)) { + ctxt->context->contextSize = 0; + ctxt->context->proximityPosition = 0; + /* QUESTION TODO: Why was this code commented out? + if (op->ch2 != -1) + total += + xmlXPathCompOpEval(ctxt, + &comp->steps[op->ch2]); + CHECK_ERROR0; + res = valuePop(ctxt); + if (res != NULL) + xmlXPathFreeObject(res); + */ + valuePush(ctxt, obj); + ctxt->context->node = oldnode; + CHECK_ERROR0; + } else { + xmlNodeSetPtr newset; + xmlXPathObjectPtr tmp = NULL; + /* + * Initialize the new set. + * Also set the xpath document in case things like + * key() evaluation are attempted on the predicate + */ + newset = xmlXPathNodeSetCreate(NULL); + /* XXX what if xmlXPathNodeSetCreate returned NULL? */ + + for (i = 0; i < oldset->nodeNr; i++) { + /* + * Run the evaluation with a node list made of + * a single item in the nodeset. + */ + ctxt->context->node = oldset->nodeTab[i]; + if ((oldset->nodeTab[i]->type != XML_NAMESPACE_DECL) && + (oldset->nodeTab[i]->doc != NULL)) + ctxt->context->doc = oldset->nodeTab[i]->doc; + if (tmp == NULL) { + tmp = xmlXPathCacheNewNodeSet(ctxt->context, + ctxt->context->node); + } else { + if (xmlXPathNodeSetAddUnique(tmp->nodesetval, + ctxt->context->node) < 0) { + ctxt->error = XPATH_MEMORY_ERROR; + } + } + valuePush(ctxt, tmp); + ctxt->context->contextSize = oldset->nodeNr; + ctxt->context->proximityPosition = i + 1; + if (op->ch2 != -1) + total += xmlXPathCompOpEval(ctxt, &comp->steps[op->ch2]); + if (ctxt->error != XPATH_EXPRESSION_OK) { + xmlXPathFreeNodeSet(newset); + xmlXPathFreeObject(obj); + return(0); + } + /* + * The result of the evaluation needs to be tested to + * decide whether the filter succeeded or not + */ + res = valuePop(ctxt); + if (xmlXPathEvaluatePredicateResult(ctxt, res)) { + if (xmlXPathNodeSetAdd(newset, oldset->nodeTab[i]) < 0) + ctxt->error = XPATH_MEMORY_ERROR; + } + /* + * Cleanup + */ + if (res != NULL) { + xmlXPathReleaseObject(ctxt->context, res); + } + if (ctxt->value == tmp) { + valuePop(ctxt); + /* + * Don't free the temporary nodeset + * in order to avoid massive recreation inside this + * loop. + */ + xmlXPathNodeSetClear(tmp->nodesetval, 1); + } else + tmp = NULL; + ctxt->context->node = NULL; + /* + * Only put the first node in the result, then leave. + */ + if (newset->nodeNr > 0) { + *first = *(newset->nodeTab); + break; + } + } + if (tmp != NULL) { + xmlXPathReleaseObject(ctxt->context, tmp); + } + /* + * The result is used as the new evaluation set. + */ + xmlXPathReleaseObject(ctxt->context, obj); + ctxt->context->node = NULL; + ctxt->context->contextSize = -1; + ctxt->context->proximityPosition = -1; + /* may want to move this past the '}' later */ + ctxt->context->doc = oldDoc; + valuePush(ctxt, xmlXPathCacheWrapNodeSet(ctxt->context, newset)); + } + ctxt->context->node = oldnode; + return(total); +} +#endif /* XP_OPTIMIZED_FILTER_FIRST */ + +/** + * xmlXPathCompOpEval: + * @ctxt: the XPath parser context with the compiled expression + * @op: an XPath compiled operation + * + * Evaluate the Precompiled XPath operation + * Returns the number of nodes traversed + */ +static int +xmlXPathCompOpEval(xmlXPathParserContextPtr ctxt, xmlXPathStepOpPtr op) +{ + int total = 0; + int equal, ret; + xmlXPathCompExprPtr comp; + xmlXPathObjectPtr arg1, arg2; + xmlNodePtr bak; + xmlDocPtr bakd; + int pp; + int cs; + + CHECK_ERROR0; + comp = ctxt->comp; + switch (op->op) { + case XPATH_OP_END: + return (0); + case XPATH_OP_AND: + bakd = ctxt->context->doc; + bak = ctxt->context->node; + pp = ctxt->context->proximityPosition; + cs = ctxt->context->contextSize; + total += xmlXPathCompOpEval(ctxt, &comp->steps[op->ch1]); + CHECK_ERROR0; + xmlXPathBooleanFunction(ctxt, 1); + if ((ctxt->value == NULL) || (ctxt->value->boolval == 0)) + return (total); + arg2 = valuePop(ctxt); + ctxt->context->doc = bakd; + ctxt->context->node = bak; + ctxt->context->proximityPosition = pp; + ctxt->context->contextSize = cs; + total += xmlXPathCompOpEval(ctxt, &comp->steps[op->ch2]); + if (ctxt->error) { + xmlXPathFreeObject(arg2); + return(0); + } + xmlXPathBooleanFunction(ctxt, 1); + arg1 = valuePop(ctxt); + arg1->boolval &= arg2->boolval; + valuePush(ctxt, arg1); + xmlXPathReleaseObject(ctxt->context, arg2); + return (total); + case XPATH_OP_OR: + bakd = ctxt->context->doc; + bak = ctxt->context->node; + pp = ctxt->context->proximityPosition; + cs = ctxt->context->contextSize; + total += xmlXPathCompOpEval(ctxt, &comp->steps[op->ch1]); + CHECK_ERROR0; + xmlXPathBooleanFunction(ctxt, 1); + if ((ctxt->value == NULL) || (ctxt->value->boolval == 1)) + return (total); + arg2 = valuePop(ctxt); + ctxt->context->doc = bakd; + ctxt->context->node = bak; + ctxt->context->proximityPosition = pp; + ctxt->context->contextSize = cs; + total += xmlXPathCompOpEval(ctxt, &comp->steps[op->ch2]); + if (ctxt->error) { + xmlXPathFreeObject(arg2); + return(0); + } + xmlXPathBooleanFunction(ctxt, 1); + arg1 = valuePop(ctxt); + arg1->boolval |= arg2->boolval; + valuePush(ctxt, arg1); + xmlXPathReleaseObject(ctxt->context, arg2); + return (total); + case XPATH_OP_EQUAL: + bakd = ctxt->context->doc; + bak = ctxt->context->node; + pp = ctxt->context->proximityPosition; + cs = ctxt->context->contextSize; + total += xmlXPathCompOpEval(ctxt, &comp->steps[op->ch1]); + CHECK_ERROR0; + ctxt->context->doc = bakd; + ctxt->context->node = bak; + ctxt->context->proximityPosition = pp; + ctxt->context->contextSize = cs; + total += xmlXPathCompOpEval(ctxt, &comp->steps[op->ch2]); + CHECK_ERROR0; + if (op->value) + equal = xmlXPathEqualValues(ctxt); + else + equal = xmlXPathNotEqualValues(ctxt); + valuePush(ctxt, xmlXPathCacheNewBoolean(ctxt->context, equal)); + return (total); + case XPATH_OP_CMP: + bakd = ctxt->context->doc; + bak = ctxt->context->node; + pp = ctxt->context->proximityPosition; + cs = ctxt->context->contextSize; + total += xmlXPathCompOpEval(ctxt, &comp->steps[op->ch1]); + CHECK_ERROR0; + ctxt->context->doc = bakd; + ctxt->context->node = bak; + ctxt->context->proximityPosition = pp; + ctxt->context->contextSize = cs; + total += xmlXPathCompOpEval(ctxt, &comp->steps[op->ch2]); + CHECK_ERROR0; + ret = xmlXPathCompareValues(ctxt, op->value, op->value2); + valuePush(ctxt, xmlXPathCacheNewBoolean(ctxt->context, ret)); + return (total); + case XPATH_OP_PLUS: + bakd = ctxt->context->doc; + bak = ctxt->context->node; + pp = ctxt->context->proximityPosition; + cs = ctxt->context->contextSize; + total += xmlXPathCompOpEval(ctxt, &comp->steps[op->ch1]); + CHECK_ERROR0; + if (op->ch2 != -1) { + ctxt->context->doc = bakd; + ctxt->context->node = bak; + ctxt->context->proximityPosition = pp; + ctxt->context->contextSize = cs; + total += xmlXPathCompOpEval(ctxt, &comp->steps[op->ch2]); + } + CHECK_ERROR0; + if (op->value == 0) + xmlXPathSubValues(ctxt); + else if (op->value == 1) + xmlXPathAddValues(ctxt); + else if (op->value == 2) + xmlXPathValueFlipSign(ctxt); + else if (op->value == 3) { + CAST_TO_NUMBER; + CHECK_TYPE0(XPATH_NUMBER); + } + return (total); + case XPATH_OP_MULT: + bakd = ctxt->context->doc; + bak = ctxt->context->node; + pp = ctxt->context->proximityPosition; + cs = ctxt->context->contextSize; + total += xmlXPathCompOpEval(ctxt, &comp->steps[op->ch1]); + CHECK_ERROR0; + ctxt->context->doc = bakd; + ctxt->context->node = bak; + ctxt->context->proximityPosition = pp; + ctxt->context->contextSize = cs; + total += xmlXPathCompOpEval(ctxt, &comp->steps[op->ch2]); + CHECK_ERROR0; + if (op->value == 0) + xmlXPathMultValues(ctxt); + else if (op->value == 1) + xmlXPathDivValues(ctxt); + else if (op->value == 2) + xmlXPathModValues(ctxt); + return (total); + case XPATH_OP_UNION: + bakd = ctxt->context->doc; + bak = ctxt->context->node; + pp = ctxt->context->proximityPosition; + cs = ctxt->context->contextSize; + total += xmlXPathCompOpEval(ctxt, &comp->steps[op->ch1]); + CHECK_ERROR0; + ctxt->context->doc = bakd; + ctxt->context->node = bak; + ctxt->context->proximityPosition = pp; + ctxt->context->contextSize = cs; + total += xmlXPathCompOpEval(ctxt, &comp->steps[op->ch2]); + CHECK_ERROR0; + CHECK_TYPE0(XPATH_NODESET); + arg2 = valuePop(ctxt); + + CHECK_TYPE0(XPATH_NODESET); + arg1 = valuePop(ctxt); + + if ((arg1->nodesetval == NULL) || + ((arg2->nodesetval != NULL) && + (arg2->nodesetval->nodeNr != 0))) + { + arg1->nodesetval = xmlXPathNodeSetMerge(arg1->nodesetval, + arg2->nodesetval); + } + + valuePush(ctxt, arg1); + xmlXPathReleaseObject(ctxt->context, arg2); + return (total); + case XPATH_OP_ROOT: + xmlXPathRoot(ctxt); + return (total); + case XPATH_OP_NODE: + if (op->ch1 != -1) + total += xmlXPathCompOpEval(ctxt, &comp->steps[op->ch1]); + CHECK_ERROR0; + if (op->ch2 != -1) + total += xmlXPathCompOpEval(ctxt, &comp->steps[op->ch2]); + CHECK_ERROR0; + valuePush(ctxt, xmlXPathCacheNewNodeSet(ctxt->context, + ctxt->context->node)); + return (total); + case XPATH_OP_RESET: + if (op->ch1 != -1) + total += xmlXPathCompOpEval(ctxt, &comp->steps[op->ch1]); + CHECK_ERROR0; + if (op->ch2 != -1) + total += xmlXPathCompOpEval(ctxt, &comp->steps[op->ch2]); + CHECK_ERROR0; + ctxt->context->node = NULL; + return (total); + case XPATH_OP_COLLECT:{ + if (op->ch1 == -1) + return (total); + + total += xmlXPathCompOpEval(ctxt, &comp->steps[op->ch1]); + CHECK_ERROR0; + + total += xmlXPathNodeCollectAndTest(ctxt, op, NULL, NULL, 0); + return (total); + } + case XPATH_OP_VALUE: + valuePush(ctxt, + xmlXPathCacheObjectCopy(ctxt->context, + (xmlXPathObjectPtr) op->value4)); + return (total); + case XPATH_OP_VARIABLE:{ + xmlXPathObjectPtr val; + + if (op->ch1 != -1) + total += + xmlXPathCompOpEval(ctxt, &comp->steps[op->ch1]); + if (op->value5 == NULL) { + val = xmlXPathVariableLookup(ctxt->context, op->value4); + if (val == NULL) { + ctxt->error = XPATH_UNDEF_VARIABLE_ERROR; + return(0); + } + valuePush(ctxt, val); + } else { + const xmlChar *URI; + + URI = xmlXPathNsLookup(ctxt->context, op->value5); + if (URI == NULL) { + xmlGenericError(xmlGenericErrorContext, + "xmlXPathCompOpEval: variable %s bound to undefined prefix %s\n", + (char *) op->value4, (char *)op->value5); + ctxt->error = XPATH_UNDEF_PREFIX_ERROR; + return (total); + } + val = xmlXPathVariableLookupNS(ctxt->context, + op->value4, URI); + if (val == NULL) { + ctxt->error = XPATH_UNDEF_VARIABLE_ERROR; + return(0); + } + valuePush(ctxt, val); + } + return (total); + } + case XPATH_OP_FUNCTION:{ + xmlXPathFunction func; + const xmlChar *oldFunc, *oldFuncURI; + int i; + int frame; + + frame = xmlXPathSetFrame(ctxt); + if (op->ch1 != -1) { + total += + xmlXPathCompOpEval(ctxt, &comp->steps[op->ch1]); + if (ctxt->error != XPATH_EXPRESSION_OK) { + xmlXPathPopFrame(ctxt, frame); + return (total); + } + } + if (ctxt->valueNr < ctxt->valueFrame + op->value) { + xmlGenericError(xmlGenericErrorContext, + "xmlXPathCompOpEval: parameter error\n"); + ctxt->error = XPATH_INVALID_OPERAND; + xmlXPathPopFrame(ctxt, frame); + return (total); + } + for (i = 0; i < op->value; i++) { + if (ctxt->valueTab[(ctxt->valueNr - 1) - i] == NULL) { + xmlGenericError(xmlGenericErrorContext, + "xmlXPathCompOpEval: parameter error\n"); + ctxt->error = XPATH_INVALID_OPERAND; + xmlXPathPopFrame(ctxt, frame); + return (total); + } + } + if (op->cache != NULL) + XML_CAST_FPTR(func) = op->cache; + else { + const xmlChar *URI = NULL; + + if (op->value5 == NULL) + func = + xmlXPathFunctionLookup(ctxt->context, + op->value4); + else { + URI = xmlXPathNsLookup(ctxt->context, op->value5); + if (URI == NULL) { + xmlGenericError(xmlGenericErrorContext, + "xmlXPathCompOpEval: function %s bound to undefined prefix %s\n", + (char *)op->value4, (char *)op->value5); + xmlXPathPopFrame(ctxt, frame); + ctxt->error = XPATH_UNDEF_PREFIX_ERROR; + return (total); + } + func = xmlXPathFunctionLookupNS(ctxt->context, + op->value4, URI); + } + if (func == NULL) { + xmlGenericError(xmlGenericErrorContext, + "xmlXPathCompOpEval: function %s not found\n", + (char *)op->value4); + XP_ERROR0(XPATH_UNKNOWN_FUNC_ERROR); + } + op->cache = XML_CAST_FPTR(func); + op->cacheURI = (void *) URI; + } + oldFunc = ctxt->context->function; + oldFuncURI = ctxt->context->functionURI; + ctxt->context->function = op->value4; + ctxt->context->functionURI = op->cacheURI; + func(ctxt, op->value); + ctxt->context->function = oldFunc; + ctxt->context->functionURI = oldFuncURI; + xmlXPathPopFrame(ctxt, frame); + return (total); + } + case XPATH_OP_ARG: + bakd = ctxt->context->doc; + bak = ctxt->context->node; + pp = ctxt->context->proximityPosition; + cs = ctxt->context->contextSize; + if (op->ch1 != -1) { + total += xmlXPathCompOpEval(ctxt, &comp->steps[op->ch1]); + ctxt->context->contextSize = cs; + ctxt->context->proximityPosition = pp; + ctxt->context->node = bak; + ctxt->context->doc = bakd; + CHECK_ERROR0; + } + if (op->ch2 != -1) { + total += xmlXPathCompOpEval(ctxt, &comp->steps[op->ch2]); + ctxt->context->contextSize = cs; + ctxt->context->proximityPosition = pp; + ctxt->context->node = bak; + ctxt->context->doc = bakd; + CHECK_ERROR0; + } + return (total); + case XPATH_OP_PREDICATE: + case XPATH_OP_FILTER:{ + xmlXPathObjectPtr res; + xmlXPathObjectPtr obj, tmp; + xmlNodeSetPtr newset = NULL; + xmlNodeSetPtr oldset; + xmlNodePtr oldnode; + xmlDocPtr oldDoc; + int i; + + /* + * Optimization for ()[1] selection i.e. the first elem + */ + if ((op->ch1 != -1) && (op->ch2 != -1) && +#ifdef XP_OPTIMIZED_FILTER_FIRST + /* + * FILTER TODO: Can we assume that the inner processing + * will result in an ordered list if we have an + * XPATH_OP_FILTER? + * What about an additional field or flag on + * xmlXPathObject like @sorted ? This way we wouln'd need + * to assume anything, so it would be more robust and + * easier to optimize. + */ + ((comp->steps[op->ch1].op == XPATH_OP_SORT) || /* 18 */ + (comp->steps[op->ch1].op == XPATH_OP_FILTER)) && /* 17 */ +#else + (comp->steps[op->ch1].op == XPATH_OP_SORT) && +#endif + (comp->steps[op->ch2].op == XPATH_OP_VALUE)) { /* 12 */ + xmlXPathObjectPtr val; + + val = comp->steps[op->ch2].value4; + if ((val != NULL) && (val->type == XPATH_NUMBER) && + (val->floatval == 1.0)) { + xmlNodePtr first = NULL; + + total += + xmlXPathCompOpEvalFirst(ctxt, + &comp->steps[op->ch1], + &first); + CHECK_ERROR0; + /* + * The nodeset should be in document order, + * Keep only the first value + */ + if ((ctxt->value != NULL) && + (ctxt->value->type == XPATH_NODESET) && + (ctxt->value->nodesetval != NULL) && + (ctxt->value->nodesetval->nodeNr > 1)) + ctxt->value->nodesetval->nodeNr = 1; + return (total); + } + } + /* + * Optimization for ()[last()] selection i.e. the last elem + */ + if ((op->ch1 != -1) && (op->ch2 != -1) && + (comp->steps[op->ch1].op == XPATH_OP_SORT) && + (comp->steps[op->ch2].op == XPATH_OP_SORT)) { + int f = comp->steps[op->ch2].ch1; + + if ((f != -1) && + (comp->steps[f].op == XPATH_OP_FUNCTION) && + (comp->steps[f].value5 == NULL) && + (comp->steps[f].value == 0) && + (comp->steps[f].value4 != NULL) && + (xmlStrEqual + (comp->steps[f].value4, BAD_CAST "last"))) { + xmlNodePtr last = NULL; + + total += + xmlXPathCompOpEvalLast(ctxt, + &comp->steps[op->ch1], + &last); + CHECK_ERROR0; + /* + * The nodeset should be in document order, + * Keep only the last value + */ + if ((ctxt->value != NULL) && + (ctxt->value->type == XPATH_NODESET) && + (ctxt->value->nodesetval != NULL) && + (ctxt->value->nodesetval->nodeTab != NULL) && + (ctxt->value->nodesetval->nodeNr > 1)) { + ctxt->value->nodesetval->nodeTab[0] = + ctxt->value->nodesetval->nodeTab[ctxt-> + value-> + nodesetval-> + nodeNr - + 1]; + ctxt->value->nodesetval->nodeNr = 1; + } + return (total); + } + } + /* + * Process inner predicates first. + * Example "index[parent::book][1]": + * ... + * PREDICATE <-- we are here "[1]" + * PREDICATE <-- process "[parent::book]" first + * SORT + * COLLECT 'parent' 'name' 'node' book + * NODE + * ELEM Object is a number : 1 + */ + if (op->ch1 != -1) + total += + xmlXPathCompOpEval(ctxt, &comp->steps[op->ch1]); + CHECK_ERROR0; + if (op->ch2 == -1) + return (total); + if (ctxt->value == NULL) + return (total); + + oldnode = ctxt->context->node; + +#ifdef LIBXML_XPTR_ENABLED + /* + * Hum are we filtering the result of an XPointer expression + */ + if (ctxt->value->type == XPATH_LOCATIONSET) { + xmlLocationSetPtr newlocset = NULL; + xmlLocationSetPtr oldlocset; + + /* + * Extract the old locset, and then evaluate the result of the + * expression for all the element in the locset. use it to grow + * up a new locset. + */ + CHECK_TYPE0(XPATH_LOCATIONSET); + obj = valuePop(ctxt); + oldlocset = obj->user; + ctxt->context->node = NULL; + + if ((oldlocset == NULL) || (oldlocset->locNr == 0)) { + ctxt->context->contextSize = 0; + ctxt->context->proximityPosition = 0; + if (op->ch2 != -1) + total += + xmlXPathCompOpEval(ctxt, + &comp->steps[op->ch2]); + res = valuePop(ctxt); + if (res != NULL) { + xmlXPathReleaseObject(ctxt->context, res); + } + valuePush(ctxt, obj); + CHECK_ERROR0; + return (total); + } + newlocset = xmlXPtrLocationSetCreate(NULL); + + for (i = 0; i < oldlocset->locNr; i++) { + /* + * Run the evaluation with a node list made of a + * single item in the nodelocset. + */ + ctxt->context->node = oldlocset->locTab[i]->user; + ctxt->context->contextSize = oldlocset->locNr; + ctxt->context->proximityPosition = i + 1; + tmp = xmlXPathCacheNewNodeSet(ctxt->context, + ctxt->context->node); + valuePush(ctxt, tmp); + + if (op->ch2 != -1) + total += + xmlXPathCompOpEval(ctxt, + &comp->steps[op->ch2]); + if (ctxt->error != XPATH_EXPRESSION_OK) { + xmlXPathFreeObject(obj); + return(0); + } + + /* + * The result of the evaluation need to be tested to + * decided whether the filter succeeded or not + */ + res = valuePop(ctxt); + if (xmlXPathEvaluatePredicateResult(ctxt, res)) { + xmlXPtrLocationSetAdd(newlocset, + xmlXPathObjectCopy + (oldlocset->locTab[i])); + } + + /* + * Cleanup + */ + if (res != NULL) { + xmlXPathReleaseObject(ctxt->context, res); + } + if (ctxt->value == tmp) { + res = valuePop(ctxt); + xmlXPathReleaseObject(ctxt->context, res); + } + + ctxt->context->node = NULL; + } + + /* + * The result is used as the new evaluation locset. + */ + xmlXPathReleaseObject(ctxt->context, obj); + ctxt->context->node = NULL; + ctxt->context->contextSize = -1; + ctxt->context->proximityPosition = -1; + valuePush(ctxt, xmlXPtrWrapLocationSet(newlocset)); + ctxt->context->node = oldnode; + return (total); + } +#endif /* LIBXML_XPTR_ENABLED */ + + /* + * Extract the old set, and then evaluate the result of the + * expression for all the element in the set. use it to grow + * up a new set. + */ + CHECK_TYPE0(XPATH_NODESET); + obj = valuePop(ctxt); + oldset = obj->nodesetval; + + oldnode = ctxt->context->node; + oldDoc = ctxt->context->doc; + ctxt->context->node = NULL; + + if ((oldset == NULL) || (oldset->nodeNr == 0)) { + ctxt->context->contextSize = 0; + ctxt->context->proximityPosition = 0; +/* + if (op->ch2 != -1) + total += + xmlXPathCompOpEval(ctxt, + &comp->steps[op->ch2]); + CHECK_ERROR0; + res = valuePop(ctxt); + if (res != NULL) + xmlXPathFreeObject(res); +*/ + valuePush(ctxt, obj); + ctxt->context->node = oldnode; + CHECK_ERROR0; + } else { + tmp = NULL; + /* + * Initialize the new set. + * Also set the xpath document in case things like + * key() evaluation are attempted on the predicate + */ + newset = xmlXPathNodeSetCreate(NULL); + /* + * SPEC XPath 1.0: + * "For each node in the node-set to be filtered, the + * PredicateExpr is evaluated with that node as the + * context node, with the number of nodes in the + * node-set as the context size, and with the proximity + * position of the node in the node-set with respect to + * the axis as the context position;" + * @oldset is the node-set" to be filtered. + * + * SPEC XPath 1.0: + * "only predicates change the context position and + * context size (see [2.4 Predicates])." + * Example: + * node-set context pos + * nA 1 + * nB 2 + * nC 3 + * After applying predicate [position() > 1] : + * node-set context pos + * nB 1 + * nC 2 + * + * removed the first node in the node-set, then + * the context position of the + */ + for (i = 0; i < oldset->nodeNr; i++) { + /* + * Run the evaluation with a node list made of + * a single item in the nodeset. + */ + ctxt->context->node = oldset->nodeTab[i]; + if ((oldset->nodeTab[i]->type != XML_NAMESPACE_DECL) && + (oldset->nodeTab[i]->doc != NULL)) + ctxt->context->doc = oldset->nodeTab[i]->doc; + if (tmp == NULL) { + tmp = xmlXPathCacheNewNodeSet(ctxt->context, + ctxt->context->node); + } else { + if (xmlXPathNodeSetAddUnique(tmp->nodesetval, + ctxt->context->node) < 0) { + ctxt->error = XPATH_MEMORY_ERROR; + } + } + valuePush(ctxt, tmp); + ctxt->context->contextSize = oldset->nodeNr; + ctxt->context->proximityPosition = i + 1; + /* + * Evaluate the predicate against the context node. + * Can/should we optimize position() predicates + * here (e.g. "[1]")? + */ + if (op->ch2 != -1) + total += + xmlXPathCompOpEval(ctxt, + &comp->steps[op->ch2]); + if (ctxt->error != XPATH_EXPRESSION_OK) { + xmlXPathFreeNodeSet(newset); + xmlXPathFreeObject(obj); + return(0); + } + + /* + * The result of the evaluation needs to be tested to + * decide whether the filter succeeded or not + */ + /* + * OPTIMIZE TODO: Can we use + * xmlXPathNodeSetAdd*Unique()* instead? + */ + res = valuePop(ctxt); + if (xmlXPathEvaluatePredicateResult(ctxt, res)) { + if (xmlXPathNodeSetAdd(newset, oldset->nodeTab[i]) + < 0) + ctxt->error = XPATH_MEMORY_ERROR; + } + + /* + * Cleanup + */ + if (res != NULL) { + xmlXPathReleaseObject(ctxt->context, res); + } + if (ctxt->value == tmp) { + valuePop(ctxt); + xmlXPathNodeSetClear(tmp->nodesetval, 1); + /* + * Don't free the temporary nodeset + * in order to avoid massive recreation inside this + * loop. + */ + } else + tmp = NULL; + ctxt->context->node = NULL; + } + if (tmp != NULL) + xmlXPathReleaseObject(ctxt->context, tmp); + /* + * The result is used as the new evaluation set. + */ + xmlXPathReleaseObject(ctxt->context, obj); + ctxt->context->node = NULL; + ctxt->context->contextSize = -1; + ctxt->context->proximityPosition = -1; + /* may want to move this past the '}' later */ + ctxt->context->doc = oldDoc; + valuePush(ctxt, + xmlXPathCacheWrapNodeSet(ctxt->context, newset)); + } + ctxt->context->node = oldnode; + return (total); + } + case XPATH_OP_SORT: + if (op->ch1 != -1) + total += xmlXPathCompOpEval(ctxt, &comp->steps[op->ch1]); + CHECK_ERROR0; + if ((ctxt->value != NULL) && + (ctxt->value->type == XPATH_NODESET) && + (ctxt->value->nodesetval != NULL) && + (ctxt->value->nodesetval->nodeNr > 1)) + { + xmlXPathNodeSetSort(ctxt->value->nodesetval); + } + return (total); +#ifdef LIBXML_XPTR_ENABLED + case XPATH_OP_RANGETO:{ + xmlXPathObjectPtr range; + xmlXPathObjectPtr res, obj; + xmlXPathObjectPtr tmp; + xmlLocationSetPtr newlocset = NULL; + xmlLocationSetPtr oldlocset; + xmlNodeSetPtr oldset; + int i, j; + + if (op->ch1 != -1) + total += + xmlXPathCompOpEval(ctxt, &comp->steps[op->ch1]); + if (op->ch2 == -1) + return (total); + + if (ctxt->value->type == XPATH_LOCATIONSET) { + /* + * Extract the old locset, and then evaluate the result of the + * expression for all the element in the locset. use it to grow + * up a new locset. + */ + CHECK_TYPE0(XPATH_LOCATIONSET); + obj = valuePop(ctxt); + oldlocset = obj->user; + + if ((oldlocset == NULL) || (oldlocset->locNr == 0)) { + ctxt->context->node = NULL; + ctxt->context->contextSize = 0; + ctxt->context->proximityPosition = 0; + total += xmlXPathCompOpEval(ctxt,&comp->steps[op->ch2]); + res = valuePop(ctxt); + if (res != NULL) { + xmlXPathReleaseObject(ctxt->context, res); + } + valuePush(ctxt, obj); + CHECK_ERROR0; + return (total); + } + newlocset = xmlXPtrLocationSetCreate(NULL); + + for (i = 0; i < oldlocset->locNr; i++) { + /* + * Run the evaluation with a node list made of a + * single item in the nodelocset. + */ + ctxt->context->node = oldlocset->locTab[i]->user; + ctxt->context->contextSize = oldlocset->locNr; + ctxt->context->proximityPosition = i + 1; + tmp = xmlXPathCacheNewNodeSet(ctxt->context, + ctxt->context->node); + valuePush(ctxt, tmp); + + if (op->ch2 != -1) + total += + xmlXPathCompOpEval(ctxt, + &comp->steps[op->ch2]); + if (ctxt->error != XPATH_EXPRESSION_OK) { + xmlXPathFreeObject(obj); + return(0); + } + + res = valuePop(ctxt); + if (res->type == XPATH_LOCATIONSET) { + xmlLocationSetPtr rloc = + (xmlLocationSetPtr)res->user; + for (j=0; j<rloc->locNr; j++) { + range = xmlXPtrNewRange( + oldlocset->locTab[i]->user, + oldlocset->locTab[i]->index, + rloc->locTab[j]->user2, + rloc->locTab[j]->index2); + if (range != NULL) { + xmlXPtrLocationSetAdd(newlocset, range); + } + } + } else { + range = xmlXPtrNewRangeNodeObject( + (xmlNodePtr)oldlocset->locTab[i]->user, res); + if (range != NULL) { + xmlXPtrLocationSetAdd(newlocset,range); + } + } + + /* + * Cleanup + */ + if (res != NULL) { + xmlXPathReleaseObject(ctxt->context, res); + } + if (ctxt->value == tmp) { + res = valuePop(ctxt); + xmlXPathReleaseObject(ctxt->context, res); + } + + ctxt->context->node = NULL; + } + } else { /* Not a location set */ + CHECK_TYPE0(XPATH_NODESET); + obj = valuePop(ctxt); + oldset = obj->nodesetval; + ctxt->context->node = NULL; + + newlocset = xmlXPtrLocationSetCreate(NULL); + + if (oldset != NULL) { + for (i = 0; i < oldset->nodeNr; i++) { + /* + * Run the evaluation with a node list made of a single item + * in the nodeset. + */ + ctxt->context->node = oldset->nodeTab[i]; + /* + * OPTIMIZE TODO: Avoid recreation for every iteration. + */ + tmp = xmlXPathCacheNewNodeSet(ctxt->context, + ctxt->context->node); + valuePush(ctxt, tmp); + + if (op->ch2 != -1) + total += + xmlXPathCompOpEval(ctxt, + &comp->steps[op->ch2]); + if (ctxt->error != XPATH_EXPRESSION_OK) { + xmlXPathFreeObject(obj); + return(0); + } + + res = valuePop(ctxt); + range = + xmlXPtrNewRangeNodeObject(oldset->nodeTab[i], + res); + if (range != NULL) { + xmlXPtrLocationSetAdd(newlocset, range); + } + + /* + * Cleanup + */ + if (res != NULL) { + xmlXPathReleaseObject(ctxt->context, res); + } + if (ctxt->value == tmp) { + res = valuePop(ctxt); + xmlXPathReleaseObject(ctxt->context, res); + } + + ctxt->context->node = NULL; + } + } + } + + /* + * The result is used as the new evaluation set. + */ + xmlXPathReleaseObject(ctxt->context, obj); + ctxt->context->node = NULL; + ctxt->context->contextSize = -1; + ctxt->context->proximityPosition = -1; + valuePush(ctxt, xmlXPtrWrapLocationSet(newlocset)); + return (total); + } +#endif /* LIBXML_XPTR_ENABLED */ + } + xmlGenericError(xmlGenericErrorContext, + "XPath: unknown precompiled operation %d\n", op->op); + ctxt->error = XPATH_INVALID_OPERAND; + return (total); +} + +/** + * xmlXPathCompOpEvalToBoolean: + * @ctxt: the XPath parser context + * + * Evaluates if the expression evaluates to true. + * + * Returns 1 if true, 0 if false and -1 on API or internal errors. + */ +static int +xmlXPathCompOpEvalToBoolean(xmlXPathParserContextPtr ctxt, + xmlXPathStepOpPtr op, + int isPredicate) +{ + xmlXPathObjectPtr resObj = NULL; + +start: + /* comp = ctxt->comp; */ + switch (op->op) { + case XPATH_OP_END: + return (0); + case XPATH_OP_VALUE: + resObj = (xmlXPathObjectPtr) op->value4; + if (isPredicate) + return(xmlXPathEvaluatePredicateResult(ctxt, resObj)); + return(xmlXPathCastToBoolean(resObj)); + case XPATH_OP_SORT: + /* + * We don't need sorting for boolean results. Skip this one. + */ + if (op->ch1 != -1) { + op = &ctxt->comp->steps[op->ch1]; + goto start; + } + return(0); + case XPATH_OP_COLLECT: + if (op->ch1 == -1) + return(0); + + xmlXPathCompOpEval(ctxt, &ctxt->comp->steps[op->ch1]); + if (ctxt->error != XPATH_EXPRESSION_OK) + return(-1); + + xmlXPathNodeCollectAndTest(ctxt, op, NULL, NULL, 1); + if (ctxt->error != XPATH_EXPRESSION_OK) + return(-1); + + resObj = valuePop(ctxt); + if (resObj == NULL) + return(-1); + break; + default: + /* + * Fallback to call xmlXPathCompOpEval(). + */ + xmlXPathCompOpEval(ctxt, op); + if (ctxt->error != XPATH_EXPRESSION_OK) + return(-1); + + resObj = valuePop(ctxt); + if (resObj == NULL) + return(-1); + break; + } + + if (resObj) { + int res; + + if (resObj->type == XPATH_BOOLEAN) { + res = resObj->boolval; + } else if (isPredicate) { + /* + * For predicates a result of type "number" is handled + * differently: + * SPEC XPath 1.0: + * "If the result is a number, the result will be converted + * to true if the number is equal to the context position + * and will be converted to false otherwise;" + */ + res = xmlXPathEvaluatePredicateResult(ctxt, resObj); + } else { + res = xmlXPathCastToBoolean(resObj); + } + xmlXPathReleaseObject(ctxt->context, resObj); + return(res); + } + + return(0); +} + +#ifdef XPATH_STREAMING +/** + * xmlXPathRunStreamEval: + * @ctxt: the XPath parser context with the compiled expression + * + * Evaluate the Precompiled Streamable XPath expression in the given context. + */ +static int +xmlXPathRunStreamEval(xmlXPathContextPtr ctxt, xmlPatternPtr comp, + xmlXPathObjectPtr *resultSeq, int toBool) +{ + int max_depth, min_depth; + int from_root; + int ret, depth; + int eval_all_nodes; + xmlNodePtr cur = NULL, limit = NULL; + xmlStreamCtxtPtr patstream = NULL; + + int nb_nodes = 0; + + if ((ctxt == NULL) || (comp == NULL)) + return(-1); + max_depth = xmlPatternMaxDepth(comp); + if (max_depth == -1) + return(-1); + if (max_depth == -2) + max_depth = 10000; + min_depth = xmlPatternMinDepth(comp); + if (min_depth == -1) + return(-1); + from_root = xmlPatternFromRoot(comp); + if (from_root < 0) + return(-1); +#if 0 + printf("stream eval: depth %d from root %d\n", max_depth, from_root); +#endif + + if (! toBool) { + if (resultSeq == NULL) + return(-1); + *resultSeq = xmlXPathCacheNewNodeSet(ctxt, NULL); + if (*resultSeq == NULL) + return(-1); + } + + /* + * handle the special cases of "/" amd "." being matched + */ + if (min_depth == 0) { + if (from_root) { + /* Select "/" */ + if (toBool) + return(1); + xmlXPathNodeSetAddUnique((*resultSeq)->nodesetval, + (xmlNodePtr) ctxt->doc); + } else { + /* Select "self::node()" */ + if (toBool) + return(1); + xmlXPathNodeSetAddUnique((*resultSeq)->nodesetval, ctxt->node); + } + } + if (max_depth == 0) { + return(0); + } + + if (from_root) { + cur = (xmlNodePtr)ctxt->doc; + } else if (ctxt->node != NULL) { + switch (ctxt->node->type) { + case XML_ELEMENT_NODE: + case XML_DOCUMENT_NODE: + case XML_DOCUMENT_FRAG_NODE: + case XML_HTML_DOCUMENT_NODE: +#ifdef LIBXML_DOCB_ENABLED + case XML_DOCB_DOCUMENT_NODE: +#endif + cur = ctxt->node; + break; + case XML_ATTRIBUTE_NODE: + case XML_TEXT_NODE: + case XML_CDATA_SECTION_NODE: + case XML_ENTITY_REF_NODE: + case XML_ENTITY_NODE: + case XML_PI_NODE: + case XML_COMMENT_NODE: + case XML_NOTATION_NODE: + case XML_DTD_NODE: + case XML_DOCUMENT_TYPE_NODE: + case XML_ELEMENT_DECL: + case XML_ATTRIBUTE_DECL: + case XML_ENTITY_DECL: + case XML_NAMESPACE_DECL: + case XML_XINCLUDE_START: + case XML_XINCLUDE_END: + break; + } + limit = cur; + } + if (cur == NULL) { + return(0); + } + + patstream = xmlPatternGetStreamCtxt(comp); + if (patstream == NULL) { + /* + * QUESTION TODO: Is this an error? + */ + return(0); + } + + eval_all_nodes = xmlStreamWantsAnyNode(patstream); + + if (from_root) { + ret = xmlStreamPush(patstream, NULL, NULL); + if (ret < 0) { + } else if (ret == 1) { + if (toBool) + goto return_1; + xmlXPathNodeSetAddUnique((*resultSeq)->nodesetval, cur); + } + } + depth = 0; + goto scan_children; +next_node: + do { + nb_nodes++; + + switch (cur->type) { + case XML_ELEMENT_NODE: + case XML_TEXT_NODE: + case XML_CDATA_SECTION_NODE: + case XML_COMMENT_NODE: + case XML_PI_NODE: + if (cur->type == XML_ELEMENT_NODE) { + ret = xmlStreamPush(patstream, cur->name, + (cur->ns ? cur->ns->href : NULL)); + } else if (eval_all_nodes) + ret = xmlStreamPushNode(patstream, NULL, NULL, cur->type); + else + break; + + if (ret < 0) { + /* NOP. */ + } else if (ret == 1) { + if (toBool) + goto return_1; + if (xmlXPathNodeSetAddUnique((*resultSeq)->nodesetval, cur) + < 0) { + ctxt->lastError.domain = XML_FROM_XPATH; + ctxt->lastError.code = XML_ERR_NO_MEMORY; + } + } + if ((cur->children == NULL) || (depth >= max_depth)) { + ret = xmlStreamPop(patstream); + while (cur->next != NULL) { + cur = cur->next; + if ((cur->type != XML_ENTITY_DECL) && + (cur->type != XML_DTD_NODE)) + goto next_node; + } + } + default: + break; + } + +scan_children: + if (cur->type == XML_NAMESPACE_DECL) break; + if ((cur->children != NULL) && (depth < max_depth)) { + /* + * Do not descend on entities declarations + */ + if (cur->children->type != XML_ENTITY_DECL) { + cur = cur->children; + depth++; + /* + * Skip DTDs + */ + if (cur->type != XML_DTD_NODE) + continue; + } + } + + if (cur == limit) + break; + + while (cur->next != NULL) { + cur = cur->next; + if ((cur->type != XML_ENTITY_DECL) && + (cur->type != XML_DTD_NODE)) + goto next_node; + } + + do { + cur = cur->parent; + depth--; + if ((cur == NULL) || (cur == limit)) + goto done; + if (cur->type == XML_ELEMENT_NODE) { + ret = xmlStreamPop(patstream); + } else if ((eval_all_nodes) && + ((cur->type == XML_TEXT_NODE) || + (cur->type == XML_CDATA_SECTION_NODE) || + (cur->type == XML_COMMENT_NODE) || + (cur->type == XML_PI_NODE))) + { + ret = xmlStreamPop(patstream); + } + if (cur->next != NULL) { + cur = cur->next; + break; + } + } while (cur != NULL); + + } while ((cur != NULL) && (depth >= 0)); + +done: + +#if 0 + printf("stream eval: checked %d nodes selected %d\n", + nb_nodes, retObj->nodesetval->nodeNr); +#endif + + if (patstream) + xmlFreeStreamCtxt(patstream); + return(0); + +return_1: + if (patstream) + xmlFreeStreamCtxt(patstream); + return(1); +} +#endif /* XPATH_STREAMING */ + +/** + * xmlXPathRunEval: + * @ctxt: the XPath parser context with the compiled expression + * @toBool: evaluate to a boolean result + * + * Evaluate the Precompiled XPath expression in the given context. + */ +static int +xmlXPathRunEval(xmlXPathParserContextPtr ctxt, int toBool) +{ + xmlXPathCompExprPtr comp; + + if ((ctxt == NULL) || (ctxt->comp == NULL)) + return(-1); + + if (ctxt->valueTab == NULL) { + /* Allocate the value stack */ + ctxt->valueTab = (xmlXPathObjectPtr *) + xmlMalloc(10 * sizeof(xmlXPathObjectPtr)); + if (ctxt->valueTab == NULL) { + xmlXPathPErrMemory(ctxt, "creating evaluation context\n"); + xmlFree(ctxt); + } + ctxt->valueNr = 0; + ctxt->valueMax = 10; + ctxt->value = NULL; + ctxt->valueFrame = 0; + } +#ifdef XPATH_STREAMING + if (ctxt->comp->stream) { + int res; + + if (toBool) { + /* + * Evaluation to boolean result. + */ + res = xmlXPathRunStreamEval(ctxt->context, + ctxt->comp->stream, NULL, 1); + if (res != -1) + return(res); + } else { + xmlXPathObjectPtr resObj = NULL; + + /* + * Evaluation to a sequence. + */ + res = xmlXPathRunStreamEval(ctxt->context, + ctxt->comp->stream, &resObj, 0); + + if ((res != -1) && (resObj != NULL)) { + valuePush(ctxt, resObj); + return(0); + } + if (resObj != NULL) + xmlXPathReleaseObject(ctxt->context, resObj); + } + /* + * QUESTION TODO: This falls back to normal XPath evaluation + * if res == -1. Is this intended? + */ + } +#endif + comp = ctxt->comp; + if (comp->last < 0) { + xmlGenericError(xmlGenericErrorContext, + "xmlXPathRunEval: last is less than zero\n"); + return(-1); + } + if (toBool) + return(xmlXPathCompOpEvalToBoolean(ctxt, + &comp->steps[comp->last], 0)); + else + xmlXPathCompOpEval(ctxt, &comp->steps[comp->last]); + + return(0); +} + +/************************************************************************ + * * + * Public interfaces * + * * + ************************************************************************/ + +/** + * xmlXPathEvalPredicate: + * @ctxt: the XPath context + * @res: the Predicate Expression evaluation result + * + * Evaluate a predicate result for the current node. + * A PredicateExpr is evaluated by evaluating the Expr and converting + * the result to a boolean. If the result is a number, the result will + * be converted to true if the number is equal to the position of the + * context node in the context node list (as returned by the position + * function) and will be converted to false otherwise; if the result + * is not a number, then the result will be converted as if by a call + * to the boolean function. + * + * Returns 1 if predicate is true, 0 otherwise + */ +int +xmlXPathEvalPredicate(xmlXPathContextPtr ctxt, xmlXPathObjectPtr res) { + if ((ctxt == NULL) || (res == NULL)) return(0); + switch (res->type) { + case XPATH_BOOLEAN: + return(res->boolval); + case XPATH_NUMBER: + return(res->floatval == ctxt->proximityPosition); + case XPATH_NODESET: + case XPATH_XSLT_TREE: + if (res->nodesetval == NULL) + return(0); + return(res->nodesetval->nodeNr != 0); + case XPATH_STRING: + return((res->stringval != NULL) && + (xmlStrlen(res->stringval) != 0)); + default: + STRANGE + } + return(0); +} + +/** + * xmlXPathEvaluatePredicateResult: + * @ctxt: the XPath Parser context + * @res: the Predicate Expression evaluation result + * + * Evaluate a predicate result for the current node. + * A PredicateExpr is evaluated by evaluating the Expr and converting + * the result to a boolean. If the result is a number, the result will + * be converted to true if the number is equal to the position of the + * context node in the context node list (as returned by the position + * function) and will be converted to false otherwise; if the result + * is not a number, then the result will be converted as if by a call + * to the boolean function. + * + * Returns 1 if predicate is true, 0 otherwise + */ +int +xmlXPathEvaluatePredicateResult(xmlXPathParserContextPtr ctxt, + xmlXPathObjectPtr res) { + if ((ctxt == NULL) || (res == NULL)) return(0); + switch (res->type) { + case XPATH_BOOLEAN: + return(res->boolval); + case XPATH_NUMBER: +#if defined(__BORLANDC__) || (defined(_MSC_VER) && (_MSC_VER == 1200)) + return((res->floatval == ctxt->context->proximityPosition) && + (!xmlXPathIsNaN(res->floatval))); /* MSC pbm Mark Vakoc !*/ +#else + return(res->floatval == ctxt->context->proximityPosition); +#endif + case XPATH_NODESET: + case XPATH_XSLT_TREE: + if (res->nodesetval == NULL) + return(0); + return(res->nodesetval->nodeNr != 0); + case XPATH_STRING: + return((res->stringval != NULL) && (res->stringval[0] != 0)); +#ifdef LIBXML_XPTR_ENABLED + case XPATH_LOCATIONSET:{ + xmlLocationSetPtr ptr = res->user; + if (ptr == NULL) + return(0); + return (ptr->locNr != 0); + } +#endif + default: + STRANGE + } + return(0); +} + +#ifdef XPATH_STREAMING +/** + * xmlXPathTryStreamCompile: + * @ctxt: an XPath context + * @str: the XPath expression + * + * Try to compile the XPath expression as a streamable subset. + * + * Returns the compiled expression or NULL if failed to compile. + */ +static xmlXPathCompExprPtr +xmlXPathTryStreamCompile(xmlXPathContextPtr ctxt, const xmlChar *str) { + /* + * Optimization: use streaming patterns when the XPath expression can + * be compiled to a stream lookup + */ + xmlPatternPtr stream; + xmlXPathCompExprPtr comp; + xmlDictPtr dict = NULL; + const xmlChar **namespaces = NULL; + xmlNsPtr ns; + int i, j; + + if ((!xmlStrchr(str, '[')) && (!xmlStrchr(str, '(')) && + (!xmlStrchr(str, '@'))) { + const xmlChar *tmp; + + /* + * We don't try to handle expressions using the verbose axis + * specifiers ("::"), just the simplied form at this point. + * Additionally, if there is no list of namespaces available and + * there's a ":" in the expression, indicating a prefixed QName, + * then we won't try to compile either. xmlPatterncompile() needs + * to have a list of namespaces at compilation time in order to + * compile prefixed name tests. + */ + tmp = xmlStrchr(str, ':'); + if ((tmp != NULL) && + ((ctxt == NULL) || (ctxt->nsNr == 0) || (tmp[1] == ':'))) + return(NULL); + + if (ctxt != NULL) { + dict = ctxt->dict; + if (ctxt->nsNr > 0) { + namespaces = xmlMalloc(2 * (ctxt->nsNr + 1) * sizeof(xmlChar*)); + if (namespaces == NULL) { + xmlXPathErrMemory(ctxt, "allocating namespaces array\n"); + return(NULL); + } + for (i = 0, j = 0; (j < ctxt->nsNr); j++) { + ns = ctxt->namespaces[j]; + namespaces[i++] = ns->href; + namespaces[i++] = ns->prefix; + } + namespaces[i++] = NULL; + namespaces[i] = NULL; + } + } + + stream = xmlPatterncompile(str, dict, XML_PATTERN_XPATH, + &namespaces[0]); + if (namespaces != NULL) { + xmlFree((xmlChar **)namespaces); + } + if ((stream != NULL) && (xmlPatternStreamable(stream) == 1)) { + comp = xmlXPathNewCompExpr(); + if (comp == NULL) { + xmlXPathErrMemory(ctxt, "allocating streamable expression\n"); + return(NULL); + } + comp->stream = stream; + comp->dict = dict; + if (comp->dict) + xmlDictReference(comp->dict); + return(comp); + } + xmlFreePattern(stream); + } + return(NULL); +} +#endif /* XPATH_STREAMING */ + +static void +xmlXPathOptimizeExpression(xmlXPathCompExprPtr comp, xmlXPathStepOpPtr op) +{ + /* + * Try to rewrite "descendant-or-self::node()/foo" to an optimized + * internal representation. + */ + + if ((op->op == XPATH_OP_COLLECT /* 11 */) && + (op->ch1 != -1) && + (op->ch2 == -1 /* no predicate */)) + { + xmlXPathStepOpPtr prevop = &comp->steps[op->ch1]; + + if ((prevop->op == XPATH_OP_COLLECT /* 11 */) && + ((xmlXPathAxisVal) prevop->value == + AXIS_DESCENDANT_OR_SELF) && + (prevop->ch2 == -1) && + ((xmlXPathTestVal) prevop->value2 == NODE_TEST_TYPE) && + ((xmlXPathTypeVal) prevop->value3 == NODE_TYPE_NODE)) + { + /* + * This is a "descendant-or-self::node()" without predicates. + * Try to eliminate it. + */ + + switch ((xmlXPathAxisVal) op->value) { + case AXIS_CHILD: + case AXIS_DESCENDANT: + /* + * Convert "descendant-or-self::node()/child::" or + * "descendant-or-self::node()/descendant::" to + * "descendant::" + */ + op->ch1 = prevop->ch1; + op->value = AXIS_DESCENDANT; + break; + case AXIS_SELF: + case AXIS_DESCENDANT_OR_SELF: + /* + * Convert "descendant-or-self::node()/self::" or + * "descendant-or-self::node()/descendant-or-self::" to + * to "descendant-or-self::" + */ + op->ch1 = prevop->ch1; + op->value = AXIS_DESCENDANT_OR_SELF; + break; + default: + break; + } + } + } + + /* OP_VALUE has invalid ch1. */ + if (op->op == XPATH_OP_VALUE) + return; + + /* Recurse */ + if (op->ch1 != -1) + xmlXPathOptimizeExpression(comp, &comp->steps[op->ch1]); + if (op->ch2 != -1) + xmlXPathOptimizeExpression(comp, &comp->steps[op->ch2]); +} + +/** + * xmlXPathCtxtCompile: + * @ctxt: an XPath context + * @str: the XPath expression + * + * Compile an XPath expression + * + * Returns the xmlXPathCompExprPtr resulting from the compilation or NULL. + * the caller has to free the object. + */ +xmlXPathCompExprPtr +xmlXPathCtxtCompile(xmlXPathContextPtr ctxt, const xmlChar *str) { + xmlXPathParserContextPtr pctxt; + xmlXPathCompExprPtr comp; + +#ifdef XPATH_STREAMING + comp = xmlXPathTryStreamCompile(ctxt, str); + if (comp != NULL) + return(comp); +#endif + + xmlXPathInit(); + + pctxt = xmlXPathNewParserContext(str, ctxt); + if (pctxt == NULL) + return NULL; + xmlXPathCompileExpr(pctxt, 1); + + if( pctxt->error != XPATH_EXPRESSION_OK ) + { + xmlXPathFreeParserContext(pctxt); + return(NULL); + } + + if (*pctxt->cur != 0) { + /* + * aleksey: in some cases this line prints *second* error message + * (see bug #78858) and probably this should be fixed. + * However, we are not sure that all error messages are printed + * out in other places. It's not critical so we leave it as-is for now + */ + xmlXPatherror(pctxt, __FILE__, __LINE__, XPATH_EXPR_ERROR); + comp = NULL; + } else { + comp = pctxt->comp; + pctxt->comp = NULL; + } + xmlXPathFreeParserContext(pctxt); + + if (comp != NULL) { + comp->expr = xmlStrdup(str); +#ifdef DEBUG_EVAL_COUNTS + comp->string = xmlStrdup(str); + comp->nb = 0; +#endif + if ((comp->nbStep > 1) && (comp->last >= 0)) { + xmlXPathOptimizeExpression(comp, &comp->steps[comp->last]); + } + } + return(comp); +} + +/** + * xmlXPathCompile: + * @str: the XPath expression + * + * Compile an XPath expression + * + * Returns the xmlXPathCompExprPtr resulting from the compilation or NULL. + * the caller has to free the object. + */ +xmlXPathCompExprPtr +xmlXPathCompile(const xmlChar *str) { + return(xmlXPathCtxtCompile(NULL, str)); +} + +/** + * xmlXPathCompiledEvalInternal: + * @comp: the compiled XPath expression + * @ctxt: the XPath context + * @resObj: the resulting XPath object or NULL + * @toBool: 1 if only a boolean result is requested + * + * Evaluate the Precompiled XPath expression in the given context. + * The caller has to free @resObj. + * + * Returns the xmlXPathObjectPtr resulting from the evaluation or NULL. + * the caller has to free the object. + */ +static int +xmlXPathCompiledEvalInternal(xmlXPathCompExprPtr comp, + xmlXPathContextPtr ctxt, + xmlXPathObjectPtr *resObj, + int toBool) +{ + xmlXPathParserContextPtr pctxt; +#ifndef LIBXML_THREAD_ENABLED + static int reentance = 0; +#endif + int res; + + CHECK_CTXT_NEG(ctxt) + + if (comp == NULL) + return(-1); + xmlXPathInit(); + +#ifndef LIBXML_THREAD_ENABLED + reentance++; + if (reentance > 1) + xmlXPathDisableOptimizer = 1; +#endif + +#ifdef DEBUG_EVAL_COUNTS + comp->nb++; + if ((comp->string != NULL) && (comp->nb > 100)) { + fprintf(stderr, "100 x %s\n", comp->string); + comp->nb = 0; + } +#endif + pctxt = xmlXPathCompParserContext(comp, ctxt); + res = xmlXPathRunEval(pctxt, toBool); + + if (resObj) { + if (pctxt->value == NULL) { + xmlGenericError(xmlGenericErrorContext, + "xmlXPathCompiledEval: evaluation failed\n"); + *resObj = NULL; + } else { + *resObj = valuePop(pctxt); + } + } + + /* + * Pop all remaining objects from the stack. + */ + if (pctxt->valueNr > 0) { + xmlXPathObjectPtr tmp; + int stack = 0; + + do { + tmp = valuePop(pctxt); + if (tmp != NULL) { + stack++; + xmlXPathReleaseObject(ctxt, tmp); + } + } while (tmp != NULL); + if ((stack != 0) && + ((toBool) || ((resObj) && (*resObj)))) + { + xmlGenericError(xmlGenericErrorContext, + "xmlXPathCompiledEval: %d objects left on the stack.\n", + stack); + } + } + + if ((pctxt->error != XPATH_EXPRESSION_OK) && (resObj) && (*resObj)) { + xmlXPathFreeObject(*resObj); + *resObj = NULL; + } + pctxt->comp = NULL; + xmlXPathFreeParserContext(pctxt); +#ifndef LIBXML_THREAD_ENABLED + reentance--; +#endif + + return(res); +} + +/** + * xmlXPathCompiledEval: + * @comp: the compiled XPath expression + * @ctx: the XPath context + * + * Evaluate the Precompiled XPath expression in the given context. + * + * Returns the xmlXPathObjectPtr resulting from the evaluation or NULL. + * the caller has to free the object. + */ +xmlXPathObjectPtr +xmlXPathCompiledEval(xmlXPathCompExprPtr comp, xmlXPathContextPtr ctx) +{ + xmlXPathObjectPtr res = NULL; + + xmlXPathCompiledEvalInternal(comp, ctx, &res, 0); + return(res); +} + +/** + * xmlXPathCompiledEvalToBoolean: + * @comp: the compiled XPath expression + * @ctxt: the XPath context + * + * Applies the XPath boolean() function on the result of the given + * compiled expression. + * + * Returns 1 if the expression evaluated to true, 0 if to false and + * -1 in API and internal errors. + */ +int +xmlXPathCompiledEvalToBoolean(xmlXPathCompExprPtr comp, + xmlXPathContextPtr ctxt) +{ + return(xmlXPathCompiledEvalInternal(comp, ctxt, NULL, 1)); +} + +/** + * xmlXPathEvalExpr: + * @ctxt: the XPath Parser context + * + * Parse and evaluate an XPath expression in the given context, + * then push the result on the context stack + */ +void +xmlXPathEvalExpr(xmlXPathParserContextPtr ctxt) { +#ifdef XPATH_STREAMING + xmlXPathCompExprPtr comp; +#endif + + if (ctxt == NULL) return; + +#ifdef XPATH_STREAMING + comp = xmlXPathTryStreamCompile(ctxt->context, ctxt->base); + if (comp != NULL) { + if (ctxt->comp != NULL) + xmlXPathFreeCompExpr(ctxt->comp); + ctxt->comp = comp; + if (ctxt->cur != NULL) + while (*ctxt->cur != 0) ctxt->cur++; + } else +#endif + { + xmlXPathCompileExpr(ctxt, 1); + if ((ctxt->error == XPATH_EXPRESSION_OK) && + (ctxt->comp != NULL) && + (ctxt->comp->nbStep > 1) && + (ctxt->comp->last >= 0)) + { + xmlXPathOptimizeExpression(ctxt->comp, + &ctxt->comp->steps[ctxt->comp->last]); + } + } + CHECK_ERROR; + xmlXPathRunEval(ctxt, 0); +} + +/** + * xmlXPathEval: + * @str: the XPath expression + * @ctx: the XPath context + * + * Evaluate the XPath Location Path in the given context. + * + * Returns the xmlXPathObjectPtr resulting from the evaluation or NULL. + * the caller has to free the object. + */ +xmlXPathObjectPtr +xmlXPathEval(const xmlChar *str, xmlXPathContextPtr ctx) { + xmlXPathParserContextPtr ctxt; + xmlXPathObjectPtr res, tmp, init = NULL; + int stack = 0; + + CHECK_CTXT(ctx) + + xmlXPathInit(); + + ctxt = xmlXPathNewParserContext(str, ctx); + if (ctxt == NULL) + return NULL; + xmlXPathEvalExpr(ctxt); + + if (ctxt->value == NULL) { + xmlGenericError(xmlGenericErrorContext, + "xmlXPathEval: evaluation failed\n"); + res = NULL; + } else if ((*ctxt->cur != 0) && (ctxt->comp != NULL) +#ifdef XPATH_STREAMING + && (ctxt->comp->stream == NULL) +#endif + ) { + xmlXPatherror(ctxt, __FILE__, __LINE__, XPATH_EXPR_ERROR); + res = NULL; + } else { + res = valuePop(ctxt); + } + + do { + tmp = valuePop(ctxt); + if (tmp != NULL) { + if (tmp != init) + stack++; + xmlXPathReleaseObject(ctx, tmp); + } + } while (tmp != NULL); + if ((stack != 0) && (res != NULL)) { + xmlGenericError(xmlGenericErrorContext, + "xmlXPathEval: %d object left on the stack\n", + stack); + } + if (ctxt->error != XPATH_EXPRESSION_OK) { + xmlXPathFreeObject(res); + res = NULL; + } + + xmlXPathFreeParserContext(ctxt); + return(res); +} + +/** + * xmlXPathSetContextNode: + * @node: the node to to use as the context node + * @ctx: the XPath context + * + * Sets 'node' as the context node. The node must be in the same + * document as that associated with the context. + * + * Returns -1 in case of error or 0 if successful + */ +int +xmlXPathSetContextNode(xmlNodePtr node, xmlXPathContextPtr ctx) { + if ((node == NULL) || (ctx == NULL)) + return(-1); + + if (node->doc == ctx->doc) { + ctx->node = node; + return(0); + } + return(-1); +} + +/** + * xmlXPathNodeEval: + * @node: the node to to use as the context node + * @str: the XPath expression + * @ctx: the XPath context + * + * Evaluate the XPath Location Path in the given context. The node 'node' + * is set as the context node. The context node is not restored. + * + * Returns the xmlXPathObjectPtr resulting from the evaluation or NULL. + * the caller has to free the object. + */ +xmlXPathObjectPtr +xmlXPathNodeEval(xmlNodePtr node, const xmlChar *str, xmlXPathContextPtr ctx) { + if (str == NULL) + return(NULL); + if (xmlXPathSetContextNode(node, ctx) < 0) + return(NULL); + return(xmlXPathEval(str, ctx)); +} + +/** + * xmlXPathEvalExpression: + * @str: the XPath expression + * @ctxt: the XPath context + * + * Evaluate the XPath expression in the given context. + * + * Returns the xmlXPathObjectPtr resulting from the evaluation or NULL. + * the caller has to free the object. + */ +xmlXPathObjectPtr +xmlXPathEvalExpression(const xmlChar *str, xmlXPathContextPtr ctxt) { + xmlXPathParserContextPtr pctxt; + xmlXPathObjectPtr res, tmp; + int stack = 0; + + CHECK_CTXT(ctxt) + + xmlXPathInit(); + + pctxt = xmlXPathNewParserContext(str, ctxt); + if (pctxt == NULL) + return NULL; + xmlXPathEvalExpr(pctxt); + + if ((*pctxt->cur != 0) || (pctxt->error != XPATH_EXPRESSION_OK)) { + xmlXPatherror(pctxt, __FILE__, __LINE__, XPATH_EXPR_ERROR); + res = NULL; + } else { + res = valuePop(pctxt); + } + do { + tmp = valuePop(pctxt); + if (tmp != NULL) { + xmlXPathReleaseObject(ctxt, tmp); + stack++; + } + } while (tmp != NULL); + if ((stack != 0) && (res != NULL)) { + xmlGenericError(xmlGenericErrorContext, + "xmlXPathEvalExpression: %d object left on the stack\n", + stack); + } + xmlXPathFreeParserContext(pctxt); + return(res); +} + +/************************************************************************ + * * + * Extra functions not pertaining to the XPath spec * + * * + ************************************************************************/ +/** + * xmlXPathEscapeUriFunction: + * @ctxt: the XPath Parser context + * @nargs: the number of arguments + * + * Implement the escape-uri() XPath function + * string escape-uri(string $str, bool $escape-reserved) + * + * This function applies the URI escaping rules defined in section 2 of [RFC + * 2396] to the string supplied as $uri-part, which typically represents all + * or part of a URI. The effect of the function is to replace any special + * character in the string by an escape sequence of the form %xx%yy..., + * where xxyy... is the hexadecimal representation of the octets used to + * represent the character in UTF-8. + * + * The set of characters that are escaped depends on the setting of the + * boolean argument $escape-reserved. + * + * If $escape-reserved is true, all characters are escaped other than lower + * case letters a-z, upper case letters A-Z, digits 0-9, and the characters + * referred to in [RFC 2396] as "marks": specifically, "-" | "_" | "." | "!" + * | "~" | "*" | "'" | "(" | ")". The "%" character itself is escaped only + * if it is not followed by two hexadecimal digits (that is, 0-9, a-f, and + * A-F). + * + * If $escape-reserved is false, the behavior differs in that characters + * referred to in [RFC 2396] as reserved characters are not escaped. These + * characters are ";" | "/" | "?" | ":" | "@" | "&" | "=" | "+" | "$" | ",". + * + * [RFC 2396] does not define whether escaped URIs should use lower case or + * upper case for hexadecimal digits. To ensure that escaped URIs can be + * compared using string comparison functions, this function must always use + * the upper-case letters A-F. + * + * Generally, $escape-reserved should be set to true when escaping a string + * that is to form a single part of a URI, and to false when escaping an + * entire URI or URI reference. + * + * In the case of non-ascii characters, the string is encoded according to + * utf-8 and then converted according to RFC 2396. + * + * Examples + * xf:escape-uri ("gopher://spinaltap.micro.umn.edu/00/Weather/California/Los%20Angeles#ocean"), true()) + * returns "gopher%3A%2F%2Fspinaltap.micro.umn.edu%2F00%2FWeather%2FCalifornia%2FLos%20Angeles%23ocean" + * xf:escape-uri ("gopher://spinaltap.micro.umn.edu/00/Weather/California/Los%20Angeles#ocean"), false()) + * returns "gopher://spinaltap.micro.umn.edu/00/Weather/California/Los%20Angeles%23ocean" + * + */ +static void +xmlXPathEscapeUriFunction(xmlXPathParserContextPtr ctxt, int nargs) { + xmlXPathObjectPtr str; + int escape_reserved; + xmlBufPtr target; + xmlChar *cptr; + xmlChar escape[4]; + + CHECK_ARITY(2); + + escape_reserved = xmlXPathPopBoolean(ctxt); + + CAST_TO_STRING; + str = valuePop(ctxt); + + target = xmlBufCreate(); + + escape[0] = '%'; + escape[3] = 0; + + if (target) { + for (cptr = str->stringval; *cptr; cptr++) { + if ((*cptr >= 'A' && *cptr <= 'Z') || + (*cptr >= 'a' && *cptr <= 'z') || + (*cptr >= '0' && *cptr <= '9') || + *cptr == '-' || *cptr == '_' || *cptr == '.' || + *cptr == '!' || *cptr == '~' || *cptr == '*' || + *cptr == '\''|| *cptr == '(' || *cptr == ')' || + (*cptr == '%' && + ((cptr[1] >= 'A' && cptr[1] <= 'F') || + (cptr[1] >= 'a' && cptr[1] <= 'f') || + (cptr[1] >= '0' && cptr[1] <= '9')) && + ((cptr[2] >= 'A' && cptr[2] <= 'F') || + (cptr[2] >= 'a' && cptr[2] <= 'f') || + (cptr[2] >= '0' && cptr[2] <= '9'))) || + (!escape_reserved && + (*cptr == ';' || *cptr == '/' || *cptr == '?' || + *cptr == ':' || *cptr == '@' || *cptr == '&' || + *cptr == '=' || *cptr == '+' || *cptr == '$' || + *cptr == ','))) { + xmlBufAdd(target, cptr, 1); + } else { + if ((*cptr >> 4) < 10) + escape[1] = '0' + (*cptr >> 4); + else + escape[1] = 'A' - 10 + (*cptr >> 4); + if ((*cptr & 0xF) < 10) + escape[2] = '0' + (*cptr & 0xF); + else + escape[2] = 'A' - 10 + (*cptr & 0xF); + + xmlBufAdd(target, &escape[0], 3); + } + } + } + valuePush(ctxt, xmlXPathCacheNewString(ctxt->context, + xmlBufContent(target))); + xmlBufFree(target); + xmlXPathReleaseObject(ctxt->context, str); +} + +/** + * xmlXPathRegisterAllFunctions: + * @ctxt: the XPath context + * + * Registers all default XPath functions in this context + */ +void +xmlXPathRegisterAllFunctions(xmlXPathContextPtr ctxt) +{ + xmlXPathRegisterFunc(ctxt, (const xmlChar *)"boolean", + xmlXPathBooleanFunction); + xmlXPathRegisterFunc(ctxt, (const xmlChar *)"ceiling", + xmlXPathCeilingFunction); + xmlXPathRegisterFunc(ctxt, (const xmlChar *)"count", + xmlXPathCountFunction); + xmlXPathRegisterFunc(ctxt, (const xmlChar *)"concat", + xmlXPathConcatFunction); + xmlXPathRegisterFunc(ctxt, (const xmlChar *)"contains", + xmlXPathContainsFunction); + xmlXPathRegisterFunc(ctxt, (const xmlChar *)"id", + xmlXPathIdFunction); + xmlXPathRegisterFunc(ctxt, (const xmlChar *)"false", + xmlXPathFalseFunction); + xmlXPathRegisterFunc(ctxt, (const xmlChar *)"floor", + xmlXPathFloorFunction); + xmlXPathRegisterFunc(ctxt, (const xmlChar *)"last", + xmlXPathLastFunction); + xmlXPathRegisterFunc(ctxt, (const xmlChar *)"lang", + xmlXPathLangFunction); + xmlXPathRegisterFunc(ctxt, (const xmlChar *)"local-name", + xmlXPathLocalNameFunction); + xmlXPathRegisterFunc(ctxt, (const xmlChar *)"not", + xmlXPathNotFunction); + xmlXPathRegisterFunc(ctxt, (const xmlChar *)"name", + xmlXPathNameFunction); + xmlXPathRegisterFunc(ctxt, (const xmlChar *)"namespace-uri", + xmlXPathNamespaceURIFunction); + xmlXPathRegisterFunc(ctxt, (const xmlChar *)"normalize-space", + xmlXPathNormalizeFunction); + xmlXPathRegisterFunc(ctxt, (const xmlChar *)"number", + xmlXPathNumberFunction); + xmlXPathRegisterFunc(ctxt, (const xmlChar *)"position", + xmlXPathPositionFunction); + xmlXPathRegisterFunc(ctxt, (const xmlChar *)"round", + xmlXPathRoundFunction); + xmlXPathRegisterFunc(ctxt, (const xmlChar *)"string", + xmlXPathStringFunction); + xmlXPathRegisterFunc(ctxt, (const xmlChar *)"string-length", + xmlXPathStringLengthFunction); + xmlXPathRegisterFunc(ctxt, (const xmlChar *)"starts-with", + xmlXPathStartsWithFunction); + xmlXPathRegisterFunc(ctxt, (const xmlChar *)"substring", + xmlXPathSubstringFunction); + xmlXPathRegisterFunc(ctxt, (const xmlChar *)"substring-before", + xmlXPathSubstringBeforeFunction); + xmlXPathRegisterFunc(ctxt, (const xmlChar *)"substring-after", + xmlXPathSubstringAfterFunction); + xmlXPathRegisterFunc(ctxt, (const xmlChar *)"sum", + xmlXPathSumFunction); + xmlXPathRegisterFunc(ctxt, (const xmlChar *)"true", + xmlXPathTrueFunction); + xmlXPathRegisterFunc(ctxt, (const xmlChar *)"translate", + xmlXPathTranslateFunction); + + xmlXPathRegisterFuncNS(ctxt, (const xmlChar *)"escape-uri", + (const xmlChar *)"http://www.w3.org/2002/08/xquery-functions", + xmlXPathEscapeUriFunction); +} + +#endif /* LIBXML_XPATH_ENABLED */ +#define bottom_xpath +#include "elfgcchack.h" |