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Diffstat (limited to 'generic/tclParseExpr.c')
| -rw-r--r-- | generic/tclParseExpr.c | 2079 |
1 files changed, 0 insertions, 2079 deletions
diff --git a/generic/tclParseExpr.c b/generic/tclParseExpr.c deleted file mode 100644 index a1f9d78..0000000 --- a/generic/tclParseExpr.c +++ /dev/null @@ -1,2079 +0,0 @@ -/* - * tclParseExpr.c -- - * - * This file contains procedures that parse Tcl expressions. They - * do so in a general-purpose fashion that can be used for many - * different purposes, including compilation, direct execution, - * code analysis, etc. - * - * Copyright (c) 1997 Sun Microsystems, Inc. - * Copyright (c) 1998-2000 by Scriptics Corporation. - * Contributions from Don Porter, NIST, 2002. (not subject to US copyright) - * - * See the file "license.terms" for information on usage and redistribution - * of this file, and for a DISCLAIMER OF ALL WARRANTIES. - * - * RCS: @(#) $Id: tclParseExpr.c,v 1.17.2.2 2005/05/20 17:19:10 vasiljevic Exp $ - */ - -#include "tclInt.h" - -/* - * The stuff below is a bit of a hack so that this file can be used in - * environments that include no UNIX, i.e. no errno: just arrange to use - * the errno from tclExecute.c here. - */ - -#ifndef TCL_GENERIC_ONLY -#include "tclPort.h" -#else -#define NO_ERRNO_H -#endif - -#ifdef NO_ERRNO_H -extern int errno; /* Use errno from tclExecute.c. */ -#define ERANGE 34 -#endif - -/* - * Boolean variable that controls whether expression parse tracing - * is enabled. - */ - -#ifdef TCL_COMPILE_DEBUG -static int traceParseExpr = 0; -#endif /* TCL_COMPILE_DEBUG */ - -/* - * The ParseInfo structure holds state while parsing an expression. - * A pointer to an ParseInfo record is passed among the routines in - * this module. - */ - -typedef struct ParseInfo { - Tcl_Parse *parsePtr; /* Points to structure to fill in with - * information about the expression. */ - int lexeme; /* Type of last lexeme scanned in expr. - * See below for definitions. Corresponds to - * size characters beginning at start. */ - CONST char *start; /* First character in lexeme. */ - int size; /* Number of bytes in lexeme. */ - CONST char *next; /* Position of the next character to be - * scanned in the expression string. */ - CONST char *prevEnd; /* Points to the character just after the - * last one in the previous lexeme. Used to - * compute size of subexpression tokens. */ - CONST char *originalExpr; /* Points to the start of the expression - * originally passed to Tcl_ParseExpr. */ - CONST char *lastChar; /* Points just after last byte of expr. */ -} ParseInfo; - -/* - * Definitions of the different lexemes that appear in expressions. The - * order of these must match the corresponding entries in the - * operatorStrings array below. - * - * Basic lexemes: - */ - -#define LITERAL 0 -#define FUNC_NAME 1 -#define OPEN_BRACKET 2 -#define OPEN_BRACE 3 -#define OPEN_PAREN 4 -#define CLOSE_PAREN 5 -#define DOLLAR 6 -#define QUOTE 7 -#define COMMA 8 -#define END 9 -#define UNKNOWN 10 -#define UNKNOWN_CHAR 11 - -/* - * Binary numeric operators: - */ - -#define MULT 12 -#define DIVIDE 13 -#define MOD 14 -#define PLUS 15 -#define MINUS 16 -#define LEFT_SHIFT 17 -#define RIGHT_SHIFT 18 -#define LESS 19 -#define GREATER 20 -#define LEQ 21 -#define GEQ 22 -#define EQUAL 23 -#define NEQ 24 -#define BIT_AND 25 -#define BIT_XOR 26 -#define BIT_OR 27 -#define AND 28 -#define OR 29 -#define QUESTY 30 -#define COLON 31 - -/* - * Unary operators. Unary minus and plus are represented by the (binary) - * lexemes MINUS and PLUS. - */ - -#define NOT 32 -#define BIT_NOT 33 - -/* - * Binary string operators: - */ - -#define STREQ 34 -#define STRNEQ 35 - -/* - * Mapping from lexemes to strings; used for debugging messages. These - * entries must match the order and number of the lexeme definitions above. - */ - -static char *lexemeStrings[] = { - "LITERAL", "FUNCNAME", - "[", "{", "(", ")", "$", "\"", ",", "END", "UNKNOWN", "UNKNOWN_CHAR", - "*", "/", "%", "+", "-", - "<<", ">>", "<", ">", "<=", ">=", "==", "!=", - "&", "^", "|", "&&", "||", "?", ":", - "!", "~", "eq", "ne", -}; - -/* - * Declarations for local procedures to this file: - */ - -static int GetLexeme _ANSI_ARGS_((ParseInfo *infoPtr)); -static void LogSyntaxError _ANSI_ARGS_((ParseInfo *infoPtr, - CONST char *extraInfo)); -static int ParseAddExpr _ANSI_ARGS_((ParseInfo *infoPtr)); -static int ParseBitAndExpr _ANSI_ARGS_((ParseInfo *infoPtr)); -static int ParseBitOrExpr _ANSI_ARGS_((ParseInfo *infoPtr)); -static int ParseBitXorExpr _ANSI_ARGS_((ParseInfo *infoPtr)); -static int ParseCondExpr _ANSI_ARGS_((ParseInfo *infoPtr)); -static int ParseEqualityExpr _ANSI_ARGS_((ParseInfo *infoPtr)); -static int ParseLandExpr _ANSI_ARGS_((ParseInfo *infoPtr)); -static int ParseLorExpr _ANSI_ARGS_((ParseInfo *infoPtr)); -static int ParseMaxDoubleLength _ANSI_ARGS_((CONST char *string, - CONST char *end)); -static int ParseMultiplyExpr _ANSI_ARGS_((ParseInfo *infoPtr)); -static int ParsePrimaryExpr _ANSI_ARGS_((ParseInfo *infoPtr)); -static int ParseRelationalExpr _ANSI_ARGS_((ParseInfo *infoPtr)); -static int ParseShiftExpr _ANSI_ARGS_((ParseInfo *infoPtr)); -static int ParseUnaryExpr _ANSI_ARGS_((ParseInfo *infoPtr)); -static void PrependSubExprTokens _ANSI_ARGS_((CONST char *op, - int opBytes, CONST char *src, int srcBytes, - int firstIndex, ParseInfo *infoPtr)); - -/* - * Macro used to debug the execution of the recursive descent parser used - * to parse expressions. - */ - -#ifdef TCL_COMPILE_DEBUG -#define HERE(production, level) \ - if (traceParseExpr) { \ - fprintf(stderr, "%*s%s: lexeme=%s, next=\"%.20s\"\n", \ - (level), " ", (production), \ - lexemeStrings[infoPtr->lexeme], infoPtr->next); \ - } -#else -#define HERE(production, level) -#endif /* TCL_COMPILE_DEBUG */ - -/* - *---------------------------------------------------------------------- - * - * Tcl_ParseExpr -- - * - * Given a string, this procedure parses the first Tcl expression - * in the string and returns information about the structure of - * the expression. This procedure is the top-level interface to the - * the expression parsing module. No more that numBytes bytes will - * be scanned. - * - * Results: - * The return value is TCL_OK if the command was parsed successfully - * and TCL_ERROR otherwise. If an error occurs and interp isn't NULL - * then an error message is left in its result. On a successful return, - * parsePtr is filled in with information about the expression that - * was parsed. - * - * Side effects: - * If there is insufficient space in parsePtr to hold all the - * information about the expression, then additional space is - * malloc-ed. If the procedure returns TCL_OK then the caller must - * eventually invoke Tcl_FreeParse to release any additional space - * that was allocated. - * - *---------------------------------------------------------------------- - */ - -int -Tcl_ParseExpr(interp, string, numBytes, parsePtr) - Tcl_Interp *interp; /* Used for error reporting. */ - CONST char *string; /* The source string to parse. */ - int numBytes; /* Number of bytes in string. If < 0, the - * string consists of all bytes up to the - * first null character. */ - Tcl_Parse *parsePtr; /* Structure to fill with information about - * the parsed expression; any previous - * information in the structure is - * ignored. */ -{ - ParseInfo info; - int code; - - if (numBytes < 0) { - numBytes = (string? strlen(string) : 0); - } -#ifdef TCL_COMPILE_DEBUG - if (traceParseExpr) { - fprintf(stderr, "Tcl_ParseExpr: string=\"%.*s\"\n", - numBytes, string); - } -#endif /* TCL_COMPILE_DEBUG */ - - parsePtr->commentStart = NULL; - parsePtr->commentSize = 0; - parsePtr->commandStart = NULL; - parsePtr->commandSize = 0; - parsePtr->numWords = 0; - parsePtr->tokenPtr = parsePtr->staticTokens; - parsePtr->numTokens = 0; - parsePtr->tokensAvailable = NUM_STATIC_TOKENS; - parsePtr->string = string; - parsePtr->end = (string + numBytes); - parsePtr->interp = interp; - parsePtr->term = string; - parsePtr->incomplete = 0; - - /* - * Initialize the ParseInfo structure that holds state while parsing - * the expression. - */ - - info.parsePtr = parsePtr; - info.lexeme = UNKNOWN; - info.start = NULL; - info.size = 0; - info.next = string; - info.prevEnd = string; - info.originalExpr = string; - info.lastChar = (string + numBytes); /* just after last char of expr */ - - /* - * Get the first lexeme then parse the expression. - */ - - code = GetLexeme(&info); - if (code != TCL_OK) { - goto error; - } - code = ParseCondExpr(&info); - if (code != TCL_OK) { - goto error; - } - if (info.lexeme != END) { - LogSyntaxError(&info, "extra tokens at end of expression"); - goto error; - } - return TCL_OK; - - error: - if (parsePtr->tokenPtr != parsePtr->staticTokens) { - ckfree((char *) parsePtr->tokenPtr); - } - return TCL_ERROR; -} - -/* - *---------------------------------------------------------------------- - * - * ParseCondExpr -- - * - * This procedure parses a Tcl conditional expression: - * condExpr ::= lorExpr ['?' condExpr ':' condExpr] - * - * Note that this is the topmost recursive-descent parsing routine used - * by Tcl_ParseExpr to parse expressions. This avoids an extra procedure - * call since such a procedure would only return the result of calling - * ParseCondExpr. Other recursive-descent procedures that need to parse - * complete expressions also call ParseCondExpr. - * - * Results: - * The return value is TCL_OK on a successful parse and TCL_ERROR - * on failure. If TCL_ERROR is returned, then the interpreter's result - * contains an error message. - * - * Side effects: - * If there is insufficient space in parsePtr to hold all the - * information about the subexpression, then additional space is - * malloc-ed. - * - *---------------------------------------------------------------------- - */ - -static int -ParseCondExpr(infoPtr) - ParseInfo *infoPtr; /* Holds the parse state for the - * expression being parsed. */ -{ - Tcl_Parse *parsePtr = infoPtr->parsePtr; - Tcl_Token *tokenPtr, *firstTokenPtr, *condTokenPtr; - int firstIndex, numToMove, code; - CONST char *srcStart; - - HERE("condExpr", 1); - srcStart = infoPtr->start; - firstIndex = parsePtr->numTokens; - - code = ParseLorExpr(infoPtr); - if (code != TCL_OK) { - return code; - } - - if (infoPtr->lexeme == QUESTY) { - /* - * Emit two tokens: one TCL_TOKEN_SUB_EXPR token for the entire - * conditional expression, and a TCL_TOKEN_OPERATOR token for - * the "?" operator. Note that these two tokens must be inserted - * before the LOR operand tokens generated above. - */ - - if ((parsePtr->numTokens + 1) >= parsePtr->tokensAvailable) { - TclExpandTokenArray(parsePtr); - } - firstTokenPtr = &parsePtr->tokenPtr[firstIndex]; - tokenPtr = (firstTokenPtr + 2); - numToMove = (parsePtr->numTokens - firstIndex); - memmove((VOID *) tokenPtr, (VOID *) firstTokenPtr, - (size_t) (numToMove * sizeof(Tcl_Token))); - parsePtr->numTokens += 2; - - tokenPtr = firstTokenPtr; - tokenPtr->type = TCL_TOKEN_SUB_EXPR; - tokenPtr->start = srcStart; - - tokenPtr++; - tokenPtr->type = TCL_TOKEN_OPERATOR; - tokenPtr->start = infoPtr->start; - tokenPtr->size = 1; - tokenPtr->numComponents = 0; - - /* - * Skip over the '?'. - */ - - code = GetLexeme(infoPtr); - if (code != TCL_OK) { - return code; - } - - /* - * Parse the "then" expression. - */ - - code = ParseCondExpr(infoPtr); - if (code != TCL_OK) { - return code; - } - if (infoPtr->lexeme != COLON) { - LogSyntaxError(infoPtr, "missing colon from ternary conditional"); - return TCL_ERROR; - } - code = GetLexeme(infoPtr); /* skip over the ':' */ - if (code != TCL_OK) { - return code; - } - - /* - * Parse the "else" expression. - */ - - code = ParseCondExpr(infoPtr); - if (code != TCL_OK) { - return code; - } - - /* - * Now set the size-related fields in the '?' subexpression token. - */ - - condTokenPtr = &parsePtr->tokenPtr[firstIndex]; - condTokenPtr->size = (infoPtr->prevEnd - srcStart); - condTokenPtr->numComponents = parsePtr->numTokens - (firstIndex+1); - } - return TCL_OK; -} - -/* - *---------------------------------------------------------------------- - * - * ParseLorExpr -- - * - * This procedure parses a Tcl logical or expression: - * lorExpr ::= landExpr {'||' landExpr} - * - * Results: - * The return value is TCL_OK on a successful parse and TCL_ERROR - * on failure. If TCL_ERROR is returned, then the interpreter's result - * contains an error message. - * - * Side effects: - * If there is insufficient space in parsePtr to hold all the - * information about the subexpression, then additional space is - * malloc-ed. - * - *---------------------------------------------------------------------- - */ - -static int -ParseLorExpr(infoPtr) - ParseInfo *infoPtr; /* Holds the parse state for the - * expression being parsed. */ -{ - Tcl_Parse *parsePtr = infoPtr->parsePtr; - int firstIndex, code; - CONST char *srcStart, *operator; - - HERE("lorExpr", 2); - srcStart = infoPtr->start; - firstIndex = parsePtr->numTokens; - - code = ParseLandExpr(infoPtr); - if (code != TCL_OK) { - return code; - } - - while (infoPtr->lexeme == OR) { - operator = infoPtr->start; - code = GetLexeme(infoPtr); /* skip over the '||' */ - if (code != TCL_OK) { - return code; - } - code = ParseLandExpr(infoPtr); - if (code != TCL_OK) { - return code; - } - - /* - * Generate tokens for the LOR subexpression and the '||' operator. - */ - - PrependSubExprTokens(operator, 2, srcStart, - (infoPtr->prevEnd - srcStart), firstIndex, infoPtr); - } - return TCL_OK; -} - -/* - *---------------------------------------------------------------------- - * - * ParseLandExpr -- - * - * This procedure parses a Tcl logical and expression: - * landExpr ::= bitOrExpr {'&&' bitOrExpr} - * - * Results: - * The return value is TCL_OK on a successful parse and TCL_ERROR - * on failure. If TCL_ERROR is returned, then the interpreter's result - * contains an error message. - * - * Side effects: - * If there is insufficient space in parsePtr to hold all the - * information about the subexpression, then additional space is - * malloc-ed. - * - *---------------------------------------------------------------------- - */ - -static int -ParseLandExpr(infoPtr) - ParseInfo *infoPtr; /* Holds the parse state for the - * expression being parsed. */ -{ - Tcl_Parse *parsePtr = infoPtr->parsePtr; - int firstIndex, code; - CONST char *srcStart, *operator; - - HERE("landExpr", 3); - srcStart = infoPtr->start; - firstIndex = parsePtr->numTokens; - - code = ParseBitOrExpr(infoPtr); - if (code != TCL_OK) { - return code; - } - - while (infoPtr->lexeme == AND) { - operator = infoPtr->start; - code = GetLexeme(infoPtr); /* skip over the '&&' */ - if (code != TCL_OK) { - return code; - } - code = ParseBitOrExpr(infoPtr); - if (code != TCL_OK) { - return code; - } - - /* - * Generate tokens for the LAND subexpression and the '&&' operator. - */ - - PrependSubExprTokens(operator, 2, srcStart, - (infoPtr->prevEnd - srcStart), firstIndex, infoPtr); - } - return TCL_OK; -} - -/* - *---------------------------------------------------------------------- - * - * ParseBitOrExpr -- - * - * This procedure parses a Tcl bitwise or expression: - * bitOrExpr ::= bitXorExpr {'|' bitXorExpr} - * - * Results: - * The return value is TCL_OK on a successful parse and TCL_ERROR - * on failure. If TCL_ERROR is returned, then the interpreter's result - * contains an error message. - * - * Side effects: - * If there is insufficient space in parsePtr to hold all the - * information about the subexpression, then additional space is - * malloc-ed. - * - *---------------------------------------------------------------------- - */ - -static int -ParseBitOrExpr(infoPtr) - ParseInfo *infoPtr; /* Holds the parse state for the - * expression being parsed. */ -{ - Tcl_Parse *parsePtr = infoPtr->parsePtr; - int firstIndex, code; - CONST char *srcStart, *operator; - - HERE("bitOrExpr", 4); - srcStart = infoPtr->start; - firstIndex = parsePtr->numTokens; - - code = ParseBitXorExpr(infoPtr); - if (code != TCL_OK) { - return code; - } - - while (infoPtr->lexeme == BIT_OR) { - operator = infoPtr->start; - code = GetLexeme(infoPtr); /* skip over the '|' */ - if (code != TCL_OK) { - return code; - } - - code = ParseBitXorExpr(infoPtr); - if (code != TCL_OK) { - return code; - } - - /* - * Generate tokens for the BITOR subexpression and the '|' operator. - */ - - PrependSubExprTokens(operator, 1, srcStart, - (infoPtr->prevEnd - srcStart), firstIndex, infoPtr); - } - return TCL_OK; -} - -/* - *---------------------------------------------------------------------- - * - * ParseBitXorExpr -- - * - * This procedure parses a Tcl bitwise exclusive or expression: - * bitXorExpr ::= bitAndExpr {'^' bitAndExpr} - * - * Results: - * The return value is TCL_OK on a successful parse and TCL_ERROR - * on failure. If TCL_ERROR is returned, then the interpreter's result - * contains an error message. - * - * Side effects: - * If there is insufficient space in parsePtr to hold all the - * information about the subexpression, then additional space is - * malloc-ed. - * - *---------------------------------------------------------------------- - */ - -static int -ParseBitXorExpr(infoPtr) - ParseInfo *infoPtr; /* Holds the parse state for the - * expression being parsed. */ -{ - Tcl_Parse *parsePtr = infoPtr->parsePtr; - int firstIndex, code; - CONST char *srcStart, *operator; - - HERE("bitXorExpr", 5); - srcStart = infoPtr->start; - firstIndex = parsePtr->numTokens; - - code = ParseBitAndExpr(infoPtr); - if (code != TCL_OK) { - return code; - } - - while (infoPtr->lexeme == BIT_XOR) { - operator = infoPtr->start; - code = GetLexeme(infoPtr); /* skip over the '^' */ - if (code != TCL_OK) { - return code; - } - - code = ParseBitAndExpr(infoPtr); - if (code != TCL_OK) { - return code; - } - - /* - * Generate tokens for the XOR subexpression and the '^' operator. - */ - - PrependSubExprTokens(operator, 1, srcStart, - (infoPtr->prevEnd - srcStart), firstIndex, infoPtr); - } - return TCL_OK; -} - -/* - *---------------------------------------------------------------------- - * - * ParseBitAndExpr -- - * - * This procedure parses a Tcl bitwise and expression: - * bitAndExpr ::= equalityExpr {'&' equalityExpr} - * - * Results: - * The return value is TCL_OK on a successful parse and TCL_ERROR - * on failure. If TCL_ERROR is returned, then the interpreter's result - * contains an error message. - * - * Side effects: - * If there is insufficient space in parsePtr to hold all the - * information about the subexpression, then additional space is - * malloc-ed. - * - *---------------------------------------------------------------------- - */ - -static int -ParseBitAndExpr(infoPtr) - ParseInfo *infoPtr; /* Holds the parse state for the - * expression being parsed. */ -{ - Tcl_Parse *parsePtr = infoPtr->parsePtr; - int firstIndex, code; - CONST char *srcStart, *operator; - - HERE("bitAndExpr", 6); - srcStart = infoPtr->start; - firstIndex = parsePtr->numTokens; - - code = ParseEqualityExpr(infoPtr); - if (code != TCL_OK) { - return code; - } - - while (infoPtr->lexeme == BIT_AND) { - operator = infoPtr->start; - code = GetLexeme(infoPtr); /* skip over the '&' */ - if (code != TCL_OK) { - return code; - } - code = ParseEqualityExpr(infoPtr); - if (code != TCL_OK) { - return code; - } - - /* - * Generate tokens for the BITAND subexpression and '&' operator. - */ - - PrependSubExprTokens(operator, 1, srcStart, - (infoPtr->prevEnd - srcStart), firstIndex, infoPtr); - } - return TCL_OK; -} - -/* - *---------------------------------------------------------------------- - * - * ParseEqualityExpr -- - * - * This procedure parses a Tcl equality (inequality) expression: - * equalityExpr ::= relationalExpr - * {('==' | '!=' | 'ne' | 'eq') relationalExpr} - * - * Results: - * The return value is TCL_OK on a successful parse and TCL_ERROR - * on failure. If TCL_ERROR is returned, then the interpreter's result - * contains an error message. - * - * Side effects: - * If there is insufficient space in parsePtr to hold all the - * information about the subexpression, then additional space is - * malloc-ed. - * - *---------------------------------------------------------------------- - */ - -static int -ParseEqualityExpr(infoPtr) - ParseInfo *infoPtr; /* Holds the parse state for the - * expression being parsed. */ -{ - Tcl_Parse *parsePtr = infoPtr->parsePtr; - int firstIndex, lexeme, code; - CONST char *srcStart, *operator; - - HERE("equalityExpr", 7); - srcStart = infoPtr->start; - firstIndex = parsePtr->numTokens; - - code = ParseRelationalExpr(infoPtr); - if (code != TCL_OK) { - return code; - } - - lexeme = infoPtr->lexeme; - while ((lexeme == EQUAL) || (lexeme == NEQ) - || (lexeme == STREQ) || (lexeme == STRNEQ)) { - operator = infoPtr->start; - code = GetLexeme(infoPtr); /* skip over ==, !=, 'eq' or 'ne' */ - if (code != TCL_OK) { - return code; - } - code = ParseRelationalExpr(infoPtr); - if (code != TCL_OK) { - return code; - } - - /* - * Generate tokens for the subexpression and '==', '!=', 'eq' or 'ne' - * operator. - */ - - PrependSubExprTokens(operator, 2, srcStart, - (infoPtr->prevEnd - srcStart), firstIndex, infoPtr); - lexeme = infoPtr->lexeme; - } - return TCL_OK; -} - -/* - *---------------------------------------------------------------------- - * - * ParseRelationalExpr -- - * - * This procedure parses a Tcl relational expression: - * relationalExpr ::= shiftExpr {('<' | '>' | '<=' | '>=') shiftExpr} - * - * Results: - * The return value is TCL_OK on a successful parse and TCL_ERROR - * on failure. If TCL_ERROR is returned, then the interpreter's result - * contains an error message. - * - * Side effects: - * If there is insufficient space in parsePtr to hold all the - * information about the subexpression, then additional space is - * malloc-ed. - * - *---------------------------------------------------------------------- - */ - -static int -ParseRelationalExpr(infoPtr) - ParseInfo *infoPtr; /* Holds the parse state for the - * expression being parsed. */ -{ - Tcl_Parse *parsePtr = infoPtr->parsePtr; - int firstIndex, lexeme, operatorSize, code; - CONST char *srcStart, *operator; - - HERE("relationalExpr", 8); - srcStart = infoPtr->start; - firstIndex = parsePtr->numTokens; - - code = ParseShiftExpr(infoPtr); - if (code != TCL_OK) { - return code; - } - - lexeme = infoPtr->lexeme; - while ((lexeme == LESS) || (lexeme == GREATER) || (lexeme == LEQ) - || (lexeme == GEQ)) { - operator = infoPtr->start; - if ((lexeme == LEQ) || (lexeme == GEQ)) { - operatorSize = 2; - } else { - operatorSize = 1; - } - code = GetLexeme(infoPtr); /* skip over the operator */ - if (code != TCL_OK) { - return code; - } - code = ParseShiftExpr(infoPtr); - if (code != TCL_OK) { - return code; - } - - /* - * Generate tokens for the subexpression and the operator. - */ - - PrependSubExprTokens(operator, operatorSize, srcStart, - (infoPtr->prevEnd - srcStart), firstIndex, infoPtr); - lexeme = infoPtr->lexeme; - } - return TCL_OK; -} - -/* - *---------------------------------------------------------------------- - * - * ParseShiftExpr -- - * - * This procedure parses a Tcl shift expression: - * shiftExpr ::= addExpr {('<<' | '>>') addExpr} - * - * Results: - * The return value is TCL_OK on a successful parse and TCL_ERROR - * on failure. If TCL_ERROR is returned, then the interpreter's result - * contains an error message. - * - * Side effects: - * If there is insufficient space in parsePtr to hold all the - * information about the subexpression, then additional space is - * malloc-ed. - * - *---------------------------------------------------------------------- - */ - -static int -ParseShiftExpr(infoPtr) - ParseInfo *infoPtr; /* Holds the parse state for the - * expression being parsed. */ -{ - Tcl_Parse *parsePtr = infoPtr->parsePtr; - int firstIndex, lexeme, code; - CONST char *srcStart, *operator; - - HERE("shiftExpr", 9); - srcStart = infoPtr->start; - firstIndex = parsePtr->numTokens; - - code = ParseAddExpr(infoPtr); - if (code != TCL_OK) { - return code; - } - - lexeme = infoPtr->lexeme; - while ((lexeme == LEFT_SHIFT) || (lexeme == RIGHT_SHIFT)) { - operator = infoPtr->start; - code = GetLexeme(infoPtr); /* skip over << or >> */ - if (code != TCL_OK) { - return code; - } - code = ParseAddExpr(infoPtr); - if (code != TCL_OK) { - return code; - } - - /* - * Generate tokens for the subexpression and '<<' or '>>' operator. - */ - - PrependSubExprTokens(operator, 2, srcStart, - (infoPtr->prevEnd - srcStart), firstIndex, infoPtr); - lexeme = infoPtr->lexeme; - } - return TCL_OK; -} - -/* - *---------------------------------------------------------------------- - * - * ParseAddExpr -- - * - * This procedure parses a Tcl addition expression: - * addExpr ::= multiplyExpr {('+' | '-') multiplyExpr} - * - * Results: - * The return value is TCL_OK on a successful parse and TCL_ERROR - * on failure. If TCL_ERROR is returned, then the interpreter's result - * contains an error message. - * - * Side effects: - * If there is insufficient space in parsePtr to hold all the - * information about the subexpression, then additional space is - * malloc-ed. - * - *---------------------------------------------------------------------- - */ - -static int -ParseAddExpr(infoPtr) - ParseInfo *infoPtr; /* Holds the parse state for the - * expression being parsed. */ -{ - Tcl_Parse *parsePtr = infoPtr->parsePtr; - int firstIndex, lexeme, code; - CONST char *srcStart, *operator; - - HERE("addExpr", 10); - srcStart = infoPtr->start; - firstIndex = parsePtr->numTokens; - - code = ParseMultiplyExpr(infoPtr); - if (code != TCL_OK) { - return code; - } - - lexeme = infoPtr->lexeme; - while ((lexeme == PLUS) || (lexeme == MINUS)) { - operator = infoPtr->start; - code = GetLexeme(infoPtr); /* skip over + or - */ - if (code != TCL_OK) { - return code; - } - code = ParseMultiplyExpr(infoPtr); - if (code != TCL_OK) { - return code; - } - - /* - * Generate tokens for the subexpression and '+' or '-' operator. - */ - - PrependSubExprTokens(operator, 1, srcStart, - (infoPtr->prevEnd - srcStart), firstIndex, infoPtr); - lexeme = infoPtr->lexeme; - } - return TCL_OK; -} - -/* - *---------------------------------------------------------------------- - * - * ParseMultiplyExpr -- - * - * This procedure parses a Tcl multiply expression: - * multiplyExpr ::= unaryExpr {('*' | '/' | '%') unaryExpr} - * - * Results: - * The return value is TCL_OK on a successful parse and TCL_ERROR - * on failure. If TCL_ERROR is returned, then the interpreter's result - * contains an error message. - * - * Side effects: - * If there is insufficient space in parsePtr to hold all the - * information about the subexpression, then additional space is - * malloc-ed. - * - *---------------------------------------------------------------------- - */ - -static int -ParseMultiplyExpr(infoPtr) - ParseInfo *infoPtr; /* Holds the parse state for the - * expression being parsed. */ -{ - Tcl_Parse *parsePtr = infoPtr->parsePtr; - int firstIndex, lexeme, code; - CONST char *srcStart, *operator; - - HERE("multiplyExpr", 11); - srcStart = infoPtr->start; - firstIndex = parsePtr->numTokens; - - code = ParseUnaryExpr(infoPtr); - if (code != TCL_OK) { - return code; - } - - lexeme = infoPtr->lexeme; - while ((lexeme == MULT) || (lexeme == DIVIDE) || (lexeme == MOD)) { - operator = infoPtr->start; - code = GetLexeme(infoPtr); /* skip over * or / or % */ - if (code != TCL_OK) { - return code; - } - code = ParseUnaryExpr(infoPtr); - if (code != TCL_OK) { - return code; - } - - /* - * Generate tokens for the subexpression and * or / or % operator. - */ - - PrependSubExprTokens(operator, 1, srcStart, - (infoPtr->prevEnd - srcStart), firstIndex, infoPtr); - lexeme = infoPtr->lexeme; - } - return TCL_OK; -} - -/* - *---------------------------------------------------------------------- - * - * ParseUnaryExpr -- - * - * This procedure parses a Tcl unary expression: - * unaryExpr ::= ('+' | '-' | '~' | '!') unaryExpr | primaryExpr - * - * Results: - * The return value is TCL_OK on a successful parse and TCL_ERROR - * on failure. If TCL_ERROR is returned, then the interpreter's result - * contains an error message. - * - * Side effects: - * If there is insufficient space in parsePtr to hold all the - * information about the subexpression, then additional space is - * malloc-ed. - * - *---------------------------------------------------------------------- - */ - -static int -ParseUnaryExpr(infoPtr) - ParseInfo *infoPtr; /* Holds the parse state for the - * expression being parsed. */ -{ - Tcl_Parse *parsePtr = infoPtr->parsePtr; - int firstIndex, lexeme, code; - CONST char *srcStart, *operator; - - HERE("unaryExpr", 12); - srcStart = infoPtr->start; - firstIndex = parsePtr->numTokens; - - lexeme = infoPtr->lexeme; - if ((lexeme == PLUS) || (lexeme == MINUS) || (lexeme == BIT_NOT) - || (lexeme == NOT)) { - operator = infoPtr->start; - code = GetLexeme(infoPtr); /* skip over the unary operator */ - if (code != TCL_OK) { - return code; - } - code = ParseUnaryExpr(infoPtr); - if (code != TCL_OK) { - return code; - } - - /* - * Generate tokens for the subexpression and the operator. - */ - - PrependSubExprTokens(operator, 1, srcStart, - (infoPtr->prevEnd - srcStart), firstIndex, infoPtr); - } else { /* must be a primaryExpr */ - code = ParsePrimaryExpr(infoPtr); - if (code != TCL_OK) { - return code; - } - } - return TCL_OK; -} - -/* - *---------------------------------------------------------------------- - * - * ParsePrimaryExpr -- - * - * This procedure parses a Tcl primary expression: - * primaryExpr ::= literal | varReference | quotedString | - * '[' command ']' | mathFuncCall | '(' condExpr ')' - * - * Results: - * The return value is TCL_OK on a successful parse and TCL_ERROR - * on failure. If TCL_ERROR is returned, then the interpreter's result - * contains an error message. - * - * Side effects: - * If there is insufficient space in parsePtr to hold all the - * information about the subexpression, then additional space is - * malloc-ed. - * - *---------------------------------------------------------------------- - */ - -static int -ParsePrimaryExpr(infoPtr) - ParseInfo *infoPtr; /* Holds the parse state for the - * expression being parsed. */ -{ - Tcl_Parse *parsePtr = infoPtr->parsePtr; - Tcl_Interp *interp = parsePtr->interp; - Tcl_Token *tokenPtr, *exprTokenPtr; - Tcl_Parse nested; - CONST char *dollarPtr, *stringStart, *termPtr, *src; - int lexeme, exprIndex, firstIndex, numToMove, code; - - /* - * We simply recurse on parenthesized subexpressions. - */ - - HERE("primaryExpr", 13); - lexeme = infoPtr->lexeme; - if (lexeme == OPEN_PAREN) { - code = GetLexeme(infoPtr); /* skip over the '(' */ - if (code != TCL_OK) { - return code; - } - code = ParseCondExpr(infoPtr); - if (code != TCL_OK) { - return code; - } - if (infoPtr->lexeme != CLOSE_PAREN) { - LogSyntaxError(infoPtr, "looking for close parenthesis"); - return TCL_ERROR; - } - code = GetLexeme(infoPtr); /* skip over the ')' */ - if (code != TCL_OK) { - return code; - } - return TCL_OK; - } - - /* - * Start a TCL_TOKEN_SUB_EXPR token for the primary. - */ - - if (parsePtr->numTokens == parsePtr->tokensAvailable) { - TclExpandTokenArray(parsePtr); - } - exprIndex = parsePtr->numTokens; - exprTokenPtr = &parsePtr->tokenPtr[exprIndex]; - exprTokenPtr->type = TCL_TOKEN_SUB_EXPR; - exprTokenPtr->start = infoPtr->start; - parsePtr->numTokens++; - - /* - * Process the primary then finish setting the fields of the - * TCL_TOKEN_SUB_EXPR token. Note that we can't use the pointer now - * stored in "exprTokenPtr" in the code below since the token array - * might be reallocated. - */ - - firstIndex = parsePtr->numTokens; - switch (lexeme) { - case LITERAL: - /* - * Int or double number. - */ - - tokenizeLiteral: - if (parsePtr->numTokens == parsePtr->tokensAvailable) { - TclExpandTokenArray(parsePtr); - } - tokenPtr = &parsePtr->tokenPtr[parsePtr->numTokens]; - tokenPtr->type = TCL_TOKEN_TEXT; - tokenPtr->start = infoPtr->start; - tokenPtr->size = infoPtr->size; - tokenPtr->numComponents = 0; - parsePtr->numTokens++; - - exprTokenPtr = &parsePtr->tokenPtr[exprIndex]; - exprTokenPtr->size = infoPtr->size; - exprTokenPtr->numComponents = 1; - break; - - case DOLLAR: - /* - * $var variable reference. - */ - - dollarPtr = (infoPtr->next - 1); - code = Tcl_ParseVarName(interp, dollarPtr, - (infoPtr->lastChar - dollarPtr), parsePtr, 1); - if (code != TCL_OK) { - return code; - } - infoPtr->next = dollarPtr + parsePtr->tokenPtr[firstIndex].size; - - exprTokenPtr = &parsePtr->tokenPtr[exprIndex]; - exprTokenPtr->size = parsePtr->tokenPtr[firstIndex].size; - exprTokenPtr->numComponents = - (parsePtr->tokenPtr[firstIndex].numComponents + 1); - break; - - case QUOTE: - /* - * '"' string '"' - */ - - stringStart = infoPtr->next; - code = Tcl_ParseQuotedString(interp, infoPtr->start, - (infoPtr->lastChar - stringStart), parsePtr, 1, &termPtr); - if (code != TCL_OK) { - return code; - } - infoPtr->next = termPtr; - - exprTokenPtr = &parsePtr->tokenPtr[exprIndex]; - exprTokenPtr->size = (termPtr - exprTokenPtr->start); - exprTokenPtr->numComponents = parsePtr->numTokens - firstIndex; - - /* - * If parsing the quoted string resulted in more than one token, - * insert a TCL_TOKEN_WORD token before them. This indicates that - * the quoted string represents a concatenation of multiple tokens. - */ - - if (exprTokenPtr->numComponents > 1) { - if (parsePtr->numTokens >= parsePtr->tokensAvailable) { - TclExpandTokenArray(parsePtr); - } - tokenPtr = &parsePtr->tokenPtr[firstIndex]; - numToMove = (parsePtr->numTokens - firstIndex); - memmove((VOID *) (tokenPtr + 1), (VOID *) tokenPtr, - (size_t) (numToMove * sizeof(Tcl_Token))); - parsePtr->numTokens++; - - exprTokenPtr = &parsePtr->tokenPtr[exprIndex]; - exprTokenPtr->numComponents++; - - tokenPtr->type = TCL_TOKEN_WORD; - tokenPtr->start = exprTokenPtr->start; - tokenPtr->size = exprTokenPtr->size; - tokenPtr->numComponents = (exprTokenPtr->numComponents - 1); - } - break; - - case OPEN_BRACKET: - /* - * '[' command {command} ']' - */ - - if (parsePtr->numTokens == parsePtr->tokensAvailable) { - TclExpandTokenArray(parsePtr); - } - tokenPtr = &parsePtr->tokenPtr[parsePtr->numTokens]; - tokenPtr->type = TCL_TOKEN_COMMAND; - tokenPtr->start = infoPtr->start; - tokenPtr->numComponents = 0; - parsePtr->numTokens++; - - /* - * Call Tcl_ParseCommand repeatedly to parse the nested command(s) - * to find their end, then throw away that parse information. - */ - - src = infoPtr->next; - while (1) { - if (Tcl_ParseCommand(interp, src, (parsePtr->end - src), 1, - &nested) != TCL_OK) { - parsePtr->term = nested.term; - parsePtr->errorType = nested.errorType; - parsePtr->incomplete = nested.incomplete; - return TCL_ERROR; - } - src = (nested.commandStart + nested.commandSize); - - /* - * This is equivalent to Tcl_FreeParse(&nested), but - * presumably inlined here for sake of runtime optimization - */ - - if (nested.tokenPtr != nested.staticTokens) { - ckfree((char *) nested.tokenPtr); - } - - /* - * Check for the closing ']' that ends the command substitution. - * It must have been the last character of the parsed command. - */ - - if ((nested.term < parsePtr->end) && (*nested.term == ']') - && !nested.incomplete) { - break; - } - if (src == parsePtr->end) { - if (parsePtr->interp != NULL) { - Tcl_SetResult(interp, "missing close-bracket", - TCL_STATIC); - } - parsePtr->term = tokenPtr->start; - parsePtr->errorType = TCL_PARSE_MISSING_BRACKET; - parsePtr->incomplete = 1; - return TCL_ERROR; - } - } - tokenPtr->size = (src - tokenPtr->start); - infoPtr->next = src; - - exprTokenPtr = &parsePtr->tokenPtr[exprIndex]; - exprTokenPtr->size = (src - tokenPtr->start); - exprTokenPtr->numComponents = 1; - break; - - case OPEN_BRACE: - /* - * '{' string '}' - */ - - code = Tcl_ParseBraces(interp, infoPtr->start, - (infoPtr->lastChar - infoPtr->start), parsePtr, 1, - &termPtr); - if (code != TCL_OK) { - return code; - } - infoPtr->next = termPtr; - - exprTokenPtr = &parsePtr->tokenPtr[exprIndex]; - exprTokenPtr->size = (termPtr - infoPtr->start); - exprTokenPtr->numComponents = parsePtr->numTokens - firstIndex; - - /* - * If parsing the braced string resulted in more than one token, - * insert a TCL_TOKEN_WORD token before them. This indicates that - * the braced string represents a concatenation of multiple tokens. - */ - - if (exprTokenPtr->numComponents > 1) { - if (parsePtr->numTokens >= parsePtr->tokensAvailable) { - TclExpandTokenArray(parsePtr); - } - tokenPtr = &parsePtr->tokenPtr[firstIndex]; - numToMove = (parsePtr->numTokens - firstIndex); - memmove((VOID *) (tokenPtr + 1), (VOID *) tokenPtr, - (size_t) (numToMove * sizeof(Tcl_Token))); - parsePtr->numTokens++; - - exprTokenPtr = &parsePtr->tokenPtr[exprIndex]; - exprTokenPtr->numComponents++; - - tokenPtr->type = TCL_TOKEN_WORD; - tokenPtr->start = exprTokenPtr->start; - tokenPtr->size = exprTokenPtr->size; - tokenPtr->numComponents = exprTokenPtr->numComponents-1; - } - break; - - case STREQ: - case STRNEQ: - case FUNC_NAME: { - /* - * math_func '(' expr {',' expr} ')' - */ - - ParseInfo savedInfo = *infoPtr; - - code = GetLexeme(infoPtr); /* skip over function name */ - if (code != TCL_OK) { - return code; - } - if (infoPtr->lexeme != OPEN_PAREN) { - int code; - Tcl_DString functionName; - Tcl_HashEntry *hPtr; - Interp *iPtr = (Interp *) infoPtr->parsePtr->interp; - Tcl_Obj *objPtr = Tcl_NewStringObj(savedInfo.start, savedInfo.size); - - /* Check for boolean literals (true, false, yes, no, on, off) */ - Tcl_IncrRefCount(objPtr); - code = Tcl_ConvertToType(NULL, objPtr, &tclBooleanType); - Tcl_DecrRefCount(objPtr); - if (code == TCL_OK) { - *infoPtr = savedInfo; - goto tokenizeLiteral; - } - - /* - * Guess what kind of error we have by trying to tell - * whether we have a function or variable name here. - * Alas, this makes the parser more tightly bound with the - * rest of the interpreter, but that is the only way to - * give a sensible message here. Still, it is not too - * serious as this is only done when generating an error. - */ - - /* - * Look up the name as a function name. We need a writable - * copy (DString) so we can terminate it with a NULL for - * the benefit of Tcl_FindHashEntry which operates on - * NULL-terminated string keys. - */ - Tcl_DStringInit(&functionName); - hPtr = Tcl_FindHashEntry(&iPtr->mathFuncTable, - Tcl_DStringAppend(&functionName, - savedInfo.start, savedInfo.size)); - Tcl_DStringFree(&functionName); - - /* - * Assume that we have an attempted variable reference - * unless we've got a function name, as the set of - * potential function names is typically much smaller. - */ - if (hPtr != NULL) { - LogSyntaxError(infoPtr, - "expected parenthesis enclosing function arguments"); - } else { - LogSyntaxError(infoPtr, - "variable references require preceding $"); - } - return TCL_ERROR; - } - - if (parsePtr->numTokens == parsePtr->tokensAvailable) { - TclExpandTokenArray(parsePtr); - } - tokenPtr = &parsePtr->tokenPtr[parsePtr->numTokens]; - tokenPtr->type = TCL_TOKEN_OPERATOR; - tokenPtr->start = savedInfo.start; - tokenPtr->size = savedInfo.size; - tokenPtr->numComponents = 0; - parsePtr->numTokens++; - - code = GetLexeme(infoPtr); /* skip over '(' */ - if (code != TCL_OK) { - return code; - } - - while (infoPtr->lexeme != CLOSE_PAREN) { - code = ParseCondExpr(infoPtr); - if (code != TCL_OK) { - return code; - } - - if (infoPtr->lexeme == COMMA) { - code = GetLexeme(infoPtr); /* skip over , */ - if (code != TCL_OK) { - return code; - } - } else if (infoPtr->lexeme != CLOSE_PAREN) { - LogSyntaxError(infoPtr, - "missing close parenthesis at end of function call"); - return TCL_ERROR; - } - } - - exprTokenPtr = &parsePtr->tokenPtr[exprIndex]; - exprTokenPtr->size = (infoPtr->next - exprTokenPtr->start); - exprTokenPtr->numComponents = parsePtr->numTokens - firstIndex; - break; - } - - case COMMA: - LogSyntaxError(infoPtr, - "commas can only separate function arguments"); - return TCL_ERROR; - case END: - LogSyntaxError(infoPtr, "premature end of expression"); - return TCL_ERROR; - case UNKNOWN: - LogSyntaxError(infoPtr, "single equality character not legal in expressions"); - return TCL_ERROR; - case UNKNOWN_CHAR: - LogSyntaxError(infoPtr, "character not legal in expressions"); - return TCL_ERROR; - case QUESTY: - LogSyntaxError(infoPtr, "unexpected ternary 'then' separator"); - return TCL_ERROR; - case COLON: - LogSyntaxError(infoPtr, "unexpected ternary 'else' separator"); - return TCL_ERROR; - case CLOSE_PAREN: - LogSyntaxError(infoPtr, "unexpected close parenthesis"); - return TCL_ERROR; - - default: { - char buf[64]; - - sprintf(buf, "unexpected operator %s", lexemeStrings[lexeme]); - LogSyntaxError(infoPtr, buf); - return TCL_ERROR; - } - } - - /* - * Advance to the next lexeme before returning. - */ - - code = GetLexeme(infoPtr); - if (code != TCL_OK) { - return code; - } - parsePtr->term = infoPtr->next; - return TCL_OK; -} - -/* - *---------------------------------------------------------------------- - * - * GetLexeme -- - * - * Lexical scanner for Tcl expressions: scans a single operator or - * other syntactic element from an expression string. - * - * Results: - * TCL_OK is returned unless an error occurred. In that case a standard - * Tcl error code is returned and, if infoPtr->parsePtr->interp is - * non-NULL, the interpreter's result is set to hold an error - * message. TCL_ERROR is returned if an integer overflow, or a - * floating-point overflow or underflow occurred while reading in a - * number. If the lexical analysis is successful, infoPtr->lexeme - * refers to the next symbol in the expression string, and - * infoPtr->next is advanced past the lexeme. Also, if the lexeme is a - * LITERAL or FUNC_NAME, then infoPtr->start is set to the first - * character of the lexeme; otherwise it is set NULL. - * - * Side effects: - * If there is insufficient space in parsePtr to hold all the - * information about the subexpression, then additional space is - * malloc-ed.. - * - *---------------------------------------------------------------------- - */ - -static int -GetLexeme(infoPtr) - ParseInfo *infoPtr; /* Holds state needed to parse the expr, - * including the resulting lexeme. */ -{ - register CONST char *src; /* Points to current source char. */ - char c; - int offset, length, numBytes; - Tcl_Parse *parsePtr = infoPtr->parsePtr; - Tcl_Interp *interp = parsePtr->interp; - Tcl_UniChar ch; - - /* - * Record where the previous lexeme ended. Since we always read one - * lexeme ahead during parsing, this helps us know the source length of - * subexpression tokens. - */ - - infoPtr->prevEnd = infoPtr->next; - - /* - * Scan over leading white space at the start of a lexeme. - */ - - src = infoPtr->next; - numBytes = parsePtr->end - src; - do { - char type; - int scanned = TclParseWhiteSpace(src, numBytes, parsePtr, &type); - src += scanned; numBytes -= scanned; - } while (numBytes && (*src == '\n') && (src++,numBytes--)); - parsePtr->term = src; - if (numBytes == 0) { - infoPtr->lexeme = END; - infoPtr->next = src; - return TCL_OK; - } - - /* - * Try to parse the lexeme first as an integer or floating-point - * number. Don't check for a number if the first character c is - * "+" or "-". If we did, we might treat a binary operator as unary - * by mistake, which would eventually cause a syntax error. - */ - - c = *src; - if ((c != '+') && (c != '-')) { - CONST char *end = infoPtr->lastChar; - if ((length = TclParseInteger(src, (end - src)))) { - /* - * First length bytes look like an integer. Verify by - * attempting the conversion to the largest integer we have. - */ - int code; - Tcl_WideInt wide; - Tcl_Obj *value = Tcl_NewStringObj(src, length); - - Tcl_IncrRefCount(value); - code = Tcl_GetWideIntFromObj(interp, value, &wide); - Tcl_DecrRefCount(value); - if (code == TCL_ERROR) { - parsePtr->errorType = TCL_PARSE_BAD_NUMBER; - return TCL_ERROR; - } - infoPtr->lexeme = LITERAL; - infoPtr->start = src; - infoPtr->size = length; - infoPtr->next = (src + length); - parsePtr->term = infoPtr->next; - return TCL_OK; - } else if ((length = ParseMaxDoubleLength(src, end))) { - /* - * There are length characters that could be a double. - * Let strtod() tells us for sure. Need a writable copy - * so we can set an terminating NULL to keep strtod from - * scanning too far. - */ - char *startPtr, *termPtr; - double doubleValue; - Tcl_DString toParse; - - errno = 0; - Tcl_DStringInit(&toParse); - startPtr = Tcl_DStringAppend(&toParse, src, length); - doubleValue = strtod(startPtr, &termPtr); - Tcl_DStringFree(&toParse); - if (termPtr != startPtr) { - if (errno != 0) { - if (interp != NULL) { - TclExprFloatError(interp, doubleValue); - } - parsePtr->errorType = TCL_PARSE_BAD_NUMBER; - return TCL_ERROR; - } - - /* - * startPtr was the start of a valid double, copied - * from src. - */ - - infoPtr->lexeme = LITERAL; - infoPtr->start = src; - if ((termPtr - startPtr) > length) { - infoPtr->size = length; - } else { - infoPtr->size = (termPtr - startPtr); - } - infoPtr->next = src + infoPtr->size; - parsePtr->term = infoPtr->next; - return TCL_OK; - } - } - } - - /* - * Not an integer or double literal. Initialize the lexeme's fields - * assuming the common case of a single character lexeme. - */ - - infoPtr->start = src; - infoPtr->size = 1; - infoPtr->next = src+1; - parsePtr->term = infoPtr->next; - - switch (*src) { - case '[': - infoPtr->lexeme = OPEN_BRACKET; - return TCL_OK; - - case '{': - infoPtr->lexeme = OPEN_BRACE; - return TCL_OK; - - case '(': - infoPtr->lexeme = OPEN_PAREN; - return TCL_OK; - - case ')': - infoPtr->lexeme = CLOSE_PAREN; - return TCL_OK; - - case '$': - infoPtr->lexeme = DOLLAR; - return TCL_OK; - - case '\"': - infoPtr->lexeme = QUOTE; - return TCL_OK; - - case ',': - infoPtr->lexeme = COMMA; - return TCL_OK; - - case '*': - infoPtr->lexeme = MULT; - return TCL_OK; - - case '/': - infoPtr->lexeme = DIVIDE; - return TCL_OK; - - case '%': - infoPtr->lexeme = MOD; - return TCL_OK; - - case '+': - infoPtr->lexeme = PLUS; - return TCL_OK; - - case '-': - infoPtr->lexeme = MINUS; - return TCL_OK; - - case '?': - infoPtr->lexeme = QUESTY; - return TCL_OK; - - case ':': - infoPtr->lexeme = COLON; - return TCL_OK; - - case '<': - infoPtr->lexeme = LESS; - if ((infoPtr->lastChar - src) > 1) { - switch (src[1]) { - case '<': - infoPtr->lexeme = LEFT_SHIFT; - infoPtr->size = 2; - infoPtr->next = src+2; - break; - case '=': - infoPtr->lexeme = LEQ; - infoPtr->size = 2; - infoPtr->next = src+2; - break; - } - } - parsePtr->term = infoPtr->next; - return TCL_OK; - - case '>': - infoPtr->lexeme = GREATER; - if ((infoPtr->lastChar - src) > 1) { - switch (src[1]) { - case '>': - infoPtr->lexeme = RIGHT_SHIFT; - infoPtr->size = 2; - infoPtr->next = src+2; - break; - case '=': - infoPtr->lexeme = GEQ; - infoPtr->size = 2; - infoPtr->next = src+2; - break; - } - } - parsePtr->term = infoPtr->next; - return TCL_OK; - - case '=': - infoPtr->lexeme = UNKNOWN; - if ((src[1] == '=') && ((infoPtr->lastChar - src) > 1)) { - infoPtr->lexeme = EQUAL; - infoPtr->size = 2; - infoPtr->next = src+2; - } - parsePtr->term = infoPtr->next; - return TCL_OK; - - case '!': - infoPtr->lexeme = NOT; - if ((src[1] == '=') && ((infoPtr->lastChar - src) > 1)) { - infoPtr->lexeme = NEQ; - infoPtr->size = 2; - infoPtr->next = src+2; - } - parsePtr->term = infoPtr->next; - return TCL_OK; - - case '&': - infoPtr->lexeme = BIT_AND; - if ((src[1] == '&') && ((infoPtr->lastChar - src) > 1)) { - infoPtr->lexeme = AND; - infoPtr->size = 2; - infoPtr->next = src+2; - } - parsePtr->term = infoPtr->next; - return TCL_OK; - - case '^': - infoPtr->lexeme = BIT_XOR; - return TCL_OK; - - case '|': - infoPtr->lexeme = BIT_OR; - if ((src[1] == '|') && ((infoPtr->lastChar - src) > 1)) { - infoPtr->lexeme = OR; - infoPtr->size = 2; - infoPtr->next = src+2; - } - parsePtr->term = infoPtr->next; - return TCL_OK; - - case '~': - infoPtr->lexeme = BIT_NOT; - return TCL_OK; - - case 'e': - if ((src[1] == 'q') && ((infoPtr->lastChar - src) > 1)) { - infoPtr->lexeme = STREQ; - infoPtr->size = 2; - infoPtr->next = src+2; - parsePtr->term = infoPtr->next; - return TCL_OK; - } else { - goto checkFuncName; - } - - case 'n': - if ((src[1] == 'e') && ((infoPtr->lastChar - src) > 1)) { - infoPtr->lexeme = STRNEQ; - infoPtr->size = 2; - infoPtr->next = src+2; - parsePtr->term = infoPtr->next; - return TCL_OK; - } else { - goto checkFuncName; - } - - default: - checkFuncName: - length = (infoPtr->lastChar - src); - if (Tcl_UtfCharComplete(src, length)) { - offset = Tcl_UtfToUniChar(src, &ch); - } else { - char utfBytes[TCL_UTF_MAX]; - memcpy(utfBytes, src, (size_t) length); - utfBytes[length] = '\0'; - offset = Tcl_UtfToUniChar(utfBytes, &ch); - } - c = UCHAR(ch); - if (isalpha(UCHAR(c))) { /* INTL: ISO only. */ - infoPtr->lexeme = FUNC_NAME; - while (isalnum(UCHAR(c)) || (c == '_')) { /* INTL: ISO only. */ - src += offset; length -= offset; - if (Tcl_UtfCharComplete(src, length)) { - offset = Tcl_UtfToUniChar(src, &ch); - } else { - char utfBytes[TCL_UTF_MAX]; - memcpy(utfBytes, src, (size_t) length); - utfBytes[length] = '\0'; - offset = Tcl_UtfToUniChar(utfBytes, &ch); - } - c = UCHAR(ch); - } - infoPtr->size = (src - infoPtr->start); - infoPtr->next = src; - parsePtr->term = infoPtr->next; - return TCL_OK; - } - infoPtr->lexeme = UNKNOWN_CHAR; - return TCL_OK; - } -} - -/* - *---------------------------------------------------------------------- - * - * TclParseInteger -- - * - * Scans up to numBytes bytes starting at src, and checks whether - * the leading bytes look like an integer's string representation. - * - * Results: - * Returns 0 if the leading bytes do not look like an integer. - * Otherwise, returns the number of bytes examined that look - * like an integer. This may be less than numBytes if the integer - * is only the leading part of the string. - * - * Side effects: - * None. - * - *---------------------------------------------------------------------- - */ - -int -TclParseInteger(string, numBytes) - register CONST char *string;/* The string to examine. */ - register int numBytes; /* Max number of bytes to scan. */ -{ - register CONST char *p = string; - - /* Take care of introductory "0x" */ - if ((numBytes > 1) && (p[0] == '0') && ((p[1] == 'x') || (p[1] == 'X'))) { - int scanned; - Tcl_UniChar ch; - p+=2; numBytes -= 2; - scanned = TclParseHex(p, numBytes, &ch); - if (scanned) { - return scanned + 2; - } - - /* Recognize the 0 as valid integer, but x is left behind */ - return 1; - } - while (numBytes && isdigit(UCHAR(*p))) { /* INTL: digit */ - numBytes--; p++; - } - if (numBytes == 0) { - return (p - string); - } - if ((*p != '.') && (*p != 'e') && (*p != 'E')) { - return (p - string); - } - return 0; -} - -/* - *---------------------------------------------------------------------- - * - * ParseMaxDoubleLength -- - * - * Scans a sequence of bytes checking that the characters could - * be in a string rep of a double. - * - * Results: - * Returns the number of bytes starting with string, runing to, but - * not including end, all of which could be part of a string rep. - * of a double. Only character identity is used, no actual - * parsing is done. - * - * The legal bytes are '0' - '9', 'A' - 'F', 'a' - 'f', - * '.', '+', '-', 'i', 'I', 'n', 'N', 'p', 'P', 'x', and 'X'. - * This covers the values "Inf" and "Nan" as well as the - * decimal and hexadecimal representations recognized by a - * C99-compliant strtod(). - * - * Side effects: - * None. - * - *---------------------------------------------------------------------- - */ - -static int -ParseMaxDoubleLength(string, end) - register CONST char *string;/* The string to examine. */ - CONST char *end; /* Point to the first character past the end - * of the string we are examining. */ -{ - CONST char *p = string; - while (p < end) { - switch (*p) { - case '0': case '1': case '2': case '3': case '4': case '5': - case '6': case '7': case '8': case '9': case 'A': case 'B': - case 'C': case 'D': case 'E': case 'F': case 'I': case 'N': - case 'P': case 'X': case 'a': case 'b': case 'c': case 'd': - case 'e': case 'f': case 'i': case 'n': case 'p': case 'x': - case '.': case '+': case '-': - p++; - break; - default: - goto done; - } - } - done: - return (p - string); -} - -/* - *---------------------------------------------------------------------- - * - * PrependSubExprTokens -- - * - * This procedure is called after the operands of an subexpression have - * been parsed. It generates two tokens: a TCL_TOKEN_SUB_EXPR token for - * the subexpression, and a TCL_TOKEN_OPERATOR token for its operator. - * These two tokens are inserted before the operand tokens. - * - * Results: - * None. - * - * Side effects: - * If there is insufficient space in parsePtr to hold the new tokens, - * additional space is malloc-ed. - * - *---------------------------------------------------------------------- - */ - -static void -PrependSubExprTokens(op, opBytes, src, srcBytes, firstIndex, infoPtr) - CONST char *op; /* Points to first byte of the operator - * in the source script. */ - int opBytes; /* Number of bytes in the operator. */ - CONST char *src; /* Points to first byte of the subexpression - * in the source script. */ - int srcBytes; /* Number of bytes in subexpression's - * source. */ - int firstIndex; /* Index of first token already emitted for - * operator's first (or only) operand. */ - ParseInfo *infoPtr; /* Holds the parse state for the - * expression being parsed. */ -{ - Tcl_Parse *parsePtr = infoPtr->parsePtr; - Tcl_Token *tokenPtr, *firstTokenPtr; - int numToMove; - - if ((parsePtr->numTokens + 1) >= parsePtr->tokensAvailable) { - TclExpandTokenArray(parsePtr); - } - firstTokenPtr = &parsePtr->tokenPtr[firstIndex]; - tokenPtr = (firstTokenPtr + 2); - numToMove = (parsePtr->numTokens - firstIndex); - memmove((VOID *) tokenPtr, (VOID *) firstTokenPtr, - (size_t) (numToMove * sizeof(Tcl_Token))); - parsePtr->numTokens += 2; - - tokenPtr = firstTokenPtr; - tokenPtr->type = TCL_TOKEN_SUB_EXPR; - tokenPtr->start = src; - tokenPtr->size = srcBytes; - tokenPtr->numComponents = parsePtr->numTokens - (firstIndex + 1); - - tokenPtr++; - tokenPtr->type = TCL_TOKEN_OPERATOR; - tokenPtr->start = op; - tokenPtr->size = opBytes; - tokenPtr->numComponents = 0; -} - -/* - *---------------------------------------------------------------------- - * - * LogSyntaxError -- - * - * This procedure is invoked after an error occurs when parsing an - * expression. It sets the interpreter result to an error message - * describing the error. - * - * Results: - * None. - * - * Side effects: - * Sets the interpreter result to an error message describing the - * expression that was being parsed when the error occurred, and why - * the parser considers that to be a syntax error at all. - * - *---------------------------------------------------------------------- - */ - -static void -LogSyntaxError(infoPtr, extraInfo) - ParseInfo *infoPtr; /* Holds the parse state for the - * expression being parsed. */ - CONST char *extraInfo; /* String to provide extra information - * about the syntax error. */ -{ - int numBytes = (infoPtr->lastChar - infoPtr->originalExpr); - char buffer[100]; - - if (numBytes > 60) { - sprintf(buffer, "syntax error in expression \"%.60s...\"", - infoPtr->originalExpr); - } else { - sprintf(buffer, "syntax error in expression \"%.*s\"", - numBytes, infoPtr->originalExpr); - } - Tcl_ResetResult(infoPtr->parsePtr->interp); - Tcl_AppendStringsToObj(Tcl_GetObjResult(infoPtr->parsePtr->interp), - buffer, ": ", extraInfo, (char *) NULL); - infoPtr->parsePtr->errorType = TCL_PARSE_SYNTAX; - infoPtr->parsePtr->term = infoPtr->start; -} |