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Diffstat (limited to 'generic/tclParse.c')
| -rw-r--r-- | generic/tclParse.c | 2510 |
1 files changed, 2510 insertions, 0 deletions
diff --git a/generic/tclParse.c b/generic/tclParse.c new file mode 100644 index 0000000..3a04df4 --- /dev/null +++ b/generic/tclParse.c @@ -0,0 +1,2510 @@ +/* + * tclParse.c -- + * + * This file contains functions that parse Tcl scripts. 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 Ajuba Solutions. + * 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. + */ + +#include "tclInt.h" +#include "tclParse.h" +#include <assert.h> + +/* + * The following table provides parsing information about each possible 8-bit + * character. The table is designed to be referenced with either signed or + * unsigned characters, so it has 384 entries. The first 128 entries + * correspond to negative character values, the next 256 correspond to + * positive character values. The last 128 entries are identical to the first + * 128. The table is always indexed with a 128-byte offset (the 128th entry + * corresponds to a character value of 0). + * + * The macro CHAR_TYPE is used to index into the table and return information + * about its character argument. The following return values are defined. + * + * TYPE_NORMAL - All characters that don't have special significance to + * the Tcl parser. + * TYPE_SPACE - The character is a whitespace character other than + * newline. + * TYPE_COMMAND_END - Character is newline or semicolon. + * TYPE_SUBS - Character begins a substitution or has other special + * meaning in ParseTokens: backslash, dollar sign, or + * open bracket. + * TYPE_QUOTE - Character is a double quote. + * TYPE_CLOSE_PAREN - Character is a right parenthesis. + * TYPE_CLOSE_BRACK - Character is a right square bracket. + * TYPE_BRACE - Character is a curly brace (either left or right). + */ + +const char tclCharTypeTable[] = { + /* + * Negative character values, from -128 to -1: + */ + + TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, + TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, + TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, + TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, + TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, + TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, + TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, + TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, + TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, + TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, + TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, + TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, + TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, + TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, + TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, + TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, + TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, + TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, + TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, + TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, + TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, + TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, + TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, + TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, + TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, + TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, + TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, + TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, + TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, + TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, + TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, + TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, + + /* + * Positive character values, from 0-127: + */ + + TYPE_SUBS, TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, + TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, + TYPE_NORMAL, TYPE_SPACE, TYPE_COMMAND_END, TYPE_SPACE, + TYPE_SPACE, TYPE_SPACE, TYPE_NORMAL, TYPE_NORMAL, + TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, + TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, + TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, + TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, + TYPE_SPACE, TYPE_NORMAL, TYPE_QUOTE, TYPE_NORMAL, + TYPE_SUBS, TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, + TYPE_NORMAL, TYPE_CLOSE_PAREN, TYPE_NORMAL, TYPE_NORMAL, + TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, + TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, + TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, + TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, TYPE_COMMAND_END, + TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, + TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, + TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, + TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, + TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, + TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, + TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, + TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, TYPE_SUBS, + TYPE_SUBS, TYPE_CLOSE_BRACK, TYPE_NORMAL, TYPE_NORMAL, + TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, + TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, + TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, + TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, + TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, + TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, + TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, TYPE_BRACE, + TYPE_NORMAL, TYPE_BRACE, TYPE_NORMAL, TYPE_NORMAL, + + /* + * Large unsigned character values, from 128-255: + */ + + TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, + TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, + TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, + TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, + TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, + TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, + TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, + TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, + TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, + TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, + TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, + TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, + TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, + TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, + TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, + TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, + TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, + TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, + TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, + TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, + TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, + TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, + TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, + TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, + TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, + TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, + TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, + TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, + TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, + TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, + TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, + TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, TYPE_NORMAL, +}; + +/* + * Prototypes for local functions defined in this file: + */ + +static inline int CommandComplete(const char *script, int numBytes); +static int ParseComment(const char *src, int numBytes, + Tcl_Parse *parsePtr); +static int ParseTokens(const char *src, int numBytes, int mask, + int flags, Tcl_Parse *parsePtr); +static int ParseWhiteSpace(const char *src, int numBytes, + int *incompletePtr, char *typePtr); +static int ParseAllWhiteSpace(const char *src, int numBytes, + int *incompletePtr); + +/* + *---------------------------------------------------------------------- + * + * TclParseInit -- + * + * Initialize the fields of a Tcl_Parse struct. + * + * Results: + * None. + * + * Side effects: + * The Tcl_Parse struct pointed to by parsePtr gets initialized. + * + *---------------------------------------------------------------------- + */ + +void +TclParseInit( + Tcl_Interp *interp, /* Interpreter to use for error reporting */ + const char *start, /* Start of string to be parsed. */ + int numBytes, /* Total number of bytes in string. If < 0, + * the script consists of all bytes up to the + * first null character. */ + Tcl_Parse *parsePtr) /* Points to struct to initialize */ +{ + parsePtr->numWords = 0; + parsePtr->tokenPtr = parsePtr->staticTokens; + parsePtr->numTokens = 0; + parsePtr->tokensAvailable = NUM_STATIC_TOKENS; + parsePtr->string = start; + parsePtr->end = start + numBytes; + parsePtr->term = parsePtr->end; + parsePtr->interp = interp; + parsePtr->incomplete = 0; + parsePtr->errorType = TCL_PARSE_SUCCESS; +} + +/* + *---------------------------------------------------------------------- + * + * Tcl_ParseCommand -- + * + * Given a string, this function parses the first Tcl command in the + * string and returns information about the structure of the command. + * + * 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 command that was parsed. + * + * Side effects: + * If there is insufficient space in parsePtr to hold all the information + * about the command, then additional space is malloc-ed. If the function + * returns TCL_OK then the caller must eventually invoke Tcl_FreeParse to + * release any additional space that was allocated. + * + *---------------------------------------------------------------------- + */ + +int +Tcl_ParseCommand( + Tcl_Interp *interp, /* Interpreter to use for error reporting; if + * NULL, then no error message is provided. */ + const char *start, /* First character of string containing one or + * more Tcl commands. */ + register int numBytes, /* Total number of bytes in string. If < 0, + * the script consists of all bytes up to the + * first null character. */ + int nested, /* Non-zero means this is a nested command: + * close bracket should be considered a + * command terminator. If zero, then close + * bracket has no special meaning. */ + register Tcl_Parse *parsePtr) + /* Structure to fill in with information about + * the parsed command; any previous + * information in the structure is ignored. */ +{ + register const char *src; /* Points to current character in the + * command. */ + char type; /* Result returned by CHAR_TYPE(*src). */ + Tcl_Token *tokenPtr; /* Pointer to token being filled in. */ + int wordIndex; /* Index of word token for current word. */ + int terminators; /* CHAR_TYPE bits that indicate the end of a + * command. */ + const char *termPtr; /* Set by Tcl_ParseBraces/QuotedString to + * point to char after terminating one. */ + int scanned; + + if ((start == NULL) && (numBytes != 0)) { + if (interp != NULL) { + Tcl_SetObjResult(interp, Tcl_NewStringObj( + "can't parse a NULL pointer", -1)); + } + return TCL_ERROR; + } + if (numBytes < 0) { + numBytes = strlen(start); + } + TclParseInit(interp, start, numBytes, parsePtr); + parsePtr->commentStart = NULL; + parsePtr->commentSize = 0; + parsePtr->commandStart = NULL; + parsePtr->commandSize = 0; + if (nested != 0) { + terminators = TYPE_COMMAND_END | TYPE_CLOSE_BRACK; + } else { + terminators = TYPE_COMMAND_END; + } + + /* + * Parse any leading space and comments before the first word of the + * command. + */ + + scanned = ParseComment(start, numBytes, parsePtr); + src = (start + scanned); + numBytes -= scanned; + if (numBytes == 0) { + if (nested) { + parsePtr->incomplete = nested; + } + } + + /* + * The following loop parses the words of the command, one word in each + * iteration through the loop. + */ + + parsePtr->commandStart = src; + type = CHAR_TYPE(*src); + scanned = 1; /* Can't have missing whitepsace before first word. */ + while (1) { + int expandWord = 0; + + /* Are we at command termination? */ + + if ((numBytes == 0) || (type & terminators) != 0) { + parsePtr->term = src; + parsePtr->commandSize = src + (numBytes != 0) + - parsePtr->commandStart; + return TCL_OK; + } + + /* Are we missing white space after previous word? */ + + if (scanned == 0) { + if (src[-1] == '"') { + if (interp != NULL) { + Tcl_SetObjResult(interp, Tcl_NewStringObj( + "extra characters after close-quote", -1)); + } + parsePtr->errorType = TCL_PARSE_QUOTE_EXTRA; + } else { + if (interp != NULL) { + Tcl_SetObjResult(interp, Tcl_NewStringObj( + "extra characters after close-brace", -1)); + } + parsePtr->errorType = TCL_PARSE_BRACE_EXTRA; + } + parsePtr->term = src; + error: + Tcl_FreeParse(parsePtr); + parsePtr->commandSize = parsePtr->end - parsePtr->commandStart; + return TCL_ERROR; + } + + /* + * Create the token for the word. + */ + + TclGrowParseTokenArray(parsePtr, 1); + wordIndex = parsePtr->numTokens; + tokenPtr = &parsePtr->tokenPtr[wordIndex]; + tokenPtr->type = TCL_TOKEN_WORD; + + tokenPtr->start = src; + parsePtr->numTokens++; + parsePtr->numWords++; + + /* + * At this point the word can have one of four forms: something + * enclosed in quotes, something enclosed in braces, and expanding + * word, or an unquoted word (anything else). + */ + + parseWord: + if (*src == '"') { + if (Tcl_ParseQuotedString(interp, src, numBytes, parsePtr, 1, + &termPtr) != TCL_OK) { + goto error; + } + src = termPtr; + numBytes = parsePtr->end - src; + } else if (*src == '{') { + int expIdx = wordIndex + 1; + Tcl_Token *expPtr; + + if (Tcl_ParseBraces(interp, src, numBytes, parsePtr, 1, + &termPtr) != TCL_OK) { + goto error; + } + src = termPtr; + numBytes = parsePtr->end - src; + + /* + * Check whether the braces contained the word expansion prefix + * {*} + */ + + expPtr = &parsePtr->tokenPtr[expIdx]; + if ((0 == expandWord) + /* Haven't seen prefix already */ + && (1 == parsePtr->numTokens - expIdx) + /* Only one token */ + && (((1 == (size_t) expPtr->size) + /* Same length as prefix */ + && (expPtr->start[0] == '*'))) + /* Is the prefix */ + && (numBytes > 0) && (0 == ParseWhiteSpace(termPtr, + numBytes, &parsePtr->incomplete, &type)) + && (type != TYPE_COMMAND_END) + /* Non-whitespace follows */) { + expandWord = 1; + parsePtr->numTokens--; + goto parseWord; + } + } else { + /* + * This is an unquoted word. Call ParseTokens and let it do all of + * the work. + */ + + if (ParseTokens(src, numBytes, TYPE_SPACE|terminators, + TCL_SUBST_ALL, parsePtr) != TCL_OK) { + goto error; + } + src = parsePtr->term; + numBytes = parsePtr->end - src; + } + + /* + * Finish filling in the token for the word and check for the special + * case of a word consisting of a single range of literal text. + */ + + tokenPtr = &parsePtr->tokenPtr[wordIndex]; + tokenPtr->size = src - tokenPtr->start; + tokenPtr->numComponents = parsePtr->numTokens - (wordIndex + 1); + if (expandWord) { + int i, isLiteral = 1; + + /* + * When a command includes a word that is an expanded literal; for + * example, {*}{1 2 3}, the parser performs that expansion + * immediately, generating several TCL_TOKEN_SIMPLE_WORDs instead + * of a single TCL_TOKEN_EXPAND_WORD that the Tcl_ParseCommand() + * caller might have to expand. This notably makes it simpler for + * those callers that wish to track line endings, such as those + * that implement key parts of TIP 280. + * + * First check whether the thing to be expanded is a literal, + * in the sense of being composed entirely of TCL_TOKEN_TEXT + * tokens. + */ + + for (i = 1; i <= tokenPtr->numComponents; i++) { + if (tokenPtr[i].type != TCL_TOKEN_TEXT) { + isLiteral = 0; + break; + } + } + + if (isLiteral) { + int elemCount = 0, code = TCL_OK, literal = 1; + const char *nextElem, *listEnd, *elemStart; + + /* + * The word to be expanded is a literal, so determine the + * boundaries of the literal string to be treated as a list + * and expanded. That literal string starts at + * tokenPtr[1].start, and includes all bytes up to, but not + * including (tokenPtr[tokenPtr->numComponents].start + + * tokenPtr[tokenPtr->numComponents].size) + */ + + listEnd = (tokenPtr[tokenPtr->numComponents].start + + tokenPtr[tokenPtr->numComponents].size); + nextElem = tokenPtr[1].start; + + /* + * Step through the literal string, parsing and counting list + * elements. + */ + + while (nextElem < listEnd) { + int size; + + code = TclFindElement(NULL, nextElem, listEnd - nextElem, + &elemStart, &nextElem, &size, &literal); + if ((code != TCL_OK) || !literal) { + break; + } + if (elemStart < listEnd) { + elemCount++; + } + } + + if ((code != TCL_OK) || !literal) { + /* + * Some list element could not be parsed, or is not + * present as a literal substring of the script. The + * compiler cannot handle list elements that get generated + * by a call to TclCopyAndCollapse(). Defer the + * handling of this to compile/eval time, where code is + * already in place to report the "attempt to expand a + * non-list" error or expand lists that require + * substitution. + */ + + tokenPtr->type = TCL_TOKEN_EXPAND_WORD; + } else if (elemCount == 0) { + /* + * We are expanding a literal empty list. This means that + * the expanding word completely disappears, leaving no + * word generated this pass through the loop. Adjust + * accounting appropriately. + */ + + parsePtr->numWords--; + parsePtr->numTokens = wordIndex; + } else { + /* + * Recalculate the number of Tcl_Tokens needed to store + * tokens representing the expanded list. + */ + + const char *listStart; + int growthNeeded = wordIndex + 2*elemCount + - parsePtr->numTokens; + + parsePtr->numWords += elemCount - 1; + if (growthNeeded > 0) { + TclGrowParseTokenArray(parsePtr, growthNeeded); + tokenPtr = &parsePtr->tokenPtr[wordIndex]; + } + parsePtr->numTokens = wordIndex + 2*elemCount; + + /* + * Generate a TCL_TOKEN_SIMPLE_WORD token sequence for + * each element of the literal list we are expanding in + * place. Take care with the start and size fields of each + * token so they point to the right literal characters in + * the original script to represent the right expanded + * word value. + */ + + listStart = nextElem = tokenPtr[1].start; + while (nextElem < listEnd) { + int quoted; + + tokenPtr->type = TCL_TOKEN_SIMPLE_WORD; + tokenPtr->numComponents = 1; + + tokenPtr++; + tokenPtr->type = TCL_TOKEN_TEXT; + tokenPtr->numComponents = 0; + TclFindElement(NULL, nextElem, listEnd - nextElem, + &(tokenPtr->start), &nextElem, + &(tokenPtr->size), NULL); + + quoted = (tokenPtr->start[-1] == '{' + || tokenPtr->start[-1] == '"') + && tokenPtr->start > listStart; + tokenPtr[-1].start = tokenPtr->start - quoted; + tokenPtr[-1].size = tokenPtr->start + tokenPtr->size + - tokenPtr[-1].start + quoted; + + tokenPtr++; + } + } + } else { + /* + * The word to be expanded is not a literal, so defer + * expansion to compile/eval time by marking with a + * TCL_TOKEN_EXPAND_WORD token. + */ + + tokenPtr->type = TCL_TOKEN_EXPAND_WORD; + } + } else if ((tokenPtr->numComponents == 1) + && (tokenPtr[1].type == TCL_TOKEN_TEXT)) { + tokenPtr->type = TCL_TOKEN_SIMPLE_WORD; + } + + /* Parse the whitespace between words. */ + + scanned = ParseWhiteSpace(src,numBytes, &parsePtr->incomplete, &type); + src += scanned; + numBytes -= scanned; + } +} + +/* + *---------------------------------------------------------------------- + * + * TclIsSpaceProc -- + * + * Report whether byte is in the set of whitespace characters used by + * Tcl to separate words in scripts or elements in lists. + * + * Results: + * Returns 1, if byte is in the set, 0 otherwise. + * + * Side effects: + * None. + * + *---------------------------------------------------------------------- + */ + +int +TclIsSpaceProc( + char byte) +{ + return CHAR_TYPE(byte) & (TYPE_SPACE) || byte == '\n'; +} + +/* + *---------------------------------------------------------------------- + * + * TclIsBareword-- + * + * Report whether byte is one that can be part of a "bareword". + * This concept is named in expression parsing, where it determines + * what can be a legal function name, but is the same definition used + * in determining what variable names can be parsed as variable + * substitutions without the benefit of enclosing braces. The set of + * ASCII chars that are accepted are the numeric chars ('0'-'9'), + * the alphabetic chars ('a'-'z', 'A'-'Z') and underscore ('_'). + * + * Results: + * Returns 1, if byte is in the accepted set of chars, 0 otherwise. + * + * Side effects: + * None. + * + *---------------------------------------------------------------------- + */ + +int +TclIsBareword( + char byte) +{ + if (byte < '0' || byte > 'z') { + return 0; + } + if (byte <= '9' || byte >= 'a') { + return 1; + } + if (byte == '_') { + return 1; + } + if (byte < 'A' || byte > 'Z') { + return 0; + } + return 1; +} + +/* + *---------------------------------------------------------------------- + * + * ParseWhiteSpace -- + * + * Scans up to numBytes bytes starting at src, consuming white space + * between words as defined by Tcl's parsing rules. + * + * Results: + * Returns the number of bytes recognized as white space. Records at + * parsePtr, information about the parse. Records at typePtr the + * character type of the non-whitespace character that terminated the + * scan. + * + * Side effects: + * None. + * + *---------------------------------------------------------------------- + */ + +static int +ParseWhiteSpace( + const char *src, /* First character to parse. */ + register int numBytes, /* Max number of bytes to scan. */ + int *incompletePtr, /* Set this boolean memory to true if parsing + * indicates an incomplete command. */ + char *typePtr) /* Points to location to store character type + * of character that ends run of whitespace */ +{ + register char type = TYPE_NORMAL; + register const char *p = src; + + while (1) { + while (numBytes && ((type = CHAR_TYPE(*p)) & TYPE_SPACE)) { + numBytes--; + p++; + } + if (numBytes && (type & TYPE_SUBS)) { + if (*p != '\\') { + break; + } + if (--numBytes == 0) { + break; + } + if (p[1] != '\n') { + break; + } + p += 2; + if (--numBytes == 0) { + *incompletePtr = 1; + break; + } + continue; + } + break; + } + *typePtr = type; + return (p - src); +} + +/* + *---------------------------------------------------------------------- + * + * TclParseAllWhiteSpace -- + * + * Scans up to numBytes bytes starting at src, consuming all white space + * including the command-terminating newline characters. + * + * Results: + * Returns the number of bytes recognized as white space. + * + *---------------------------------------------------------------------- + */ + +static int +ParseAllWhiteSpace( + const char *src, /* First character to parse. */ + int numBytes, /* Max number of byes to scan */ + int *incompletePtr) /* Set true if parse is incomplete. */ +{ + char type; + const char *p = src; + + do { + int scanned = ParseWhiteSpace(p, numBytes, incompletePtr, &type); + + p += scanned; + numBytes -= scanned; + } while (numBytes && (*p == '\n') && (p++, --numBytes)); + return (p-src); +} + +int +TclParseAllWhiteSpace( + const char *src, /* First character to parse. */ + int numBytes) /* Max number of byes to scan */ +{ + int dummy; + return ParseAllWhiteSpace(src, numBytes, &dummy); +} + +/* + *---------------------------------------------------------------------- + * + * TclParseHex -- + * + * Scans a hexadecimal number as a Tcl_UniChar value (e.g., for parsing + * \x and \u escape sequences). At most numBytes bytes are scanned. + * + * Results: + * The numeric value is stored in *resultPtr. Returns the number of bytes + * consumed. + * + * Notes: + * Relies on the following properties of the ASCII character set, with + * which UTF-8 is compatible: + * + * The digits '0' .. '9' and the letters 'A' .. 'Z' and 'a' .. 'z' occupy + * consecutive code points, and '0' < 'A' < 'a'. + * + *---------------------------------------------------------------------- + */ + +int +TclParseHex( + const char *src, /* First character to parse. */ + int numBytes, /* Max number of byes to scan */ + int *resultPtr) /* Points to storage provided by caller where + * the character resulting from the + * conversion is to be written. */ +{ + int result = 0; + register const char *p = src; + + while (numBytes--) { + unsigned char digit = UCHAR(*p); + + if (!isxdigit(digit) || (result > 0x10fff)) { + break; + } + + p++; + result <<= 4; + + if (digit >= 'a') { + result |= (10 + digit - 'a'); + } else if (digit >= 'A') { + result |= (10 + digit - 'A'); + } else { + result |= (digit - '0'); + } + } + + *resultPtr = result; + return (p - src); +} + +/* + *---------------------------------------------------------------------- + * + * TclParseBackslash -- + * + * Scans up to numBytes bytes starting at src, consuming a backslash + * sequence as defined by Tcl's parsing rules. + * + * Results: + * Records at readPtr the number of bytes making up the backslash + * sequence. Records at dst the UTF-8 encoded equivalent of that + * backslash sequence. Returns the number of bytes written to dst, at + * most TCL_UTF_MAX. Either readPtr or dst may be NULL, if the results + * are not needed, but the return value is the same either way. + * + * Side effects: + * None. + * + *---------------------------------------------------------------------- + */ + +int +TclParseBackslash( + const char *src, /* Points to the backslash character of a a + * backslash sequence. */ + int numBytes, /* Max number of bytes to scan. */ + int *readPtr, /* NULL, or points to storage where the number + * of bytes scanned should be written. */ + char *dst) /* NULL, or points to buffer where the UTF-8 + * encoding of the backslash sequence is to be + * written. At most TCL_UTF_MAX bytes will be + * written there. */ +{ + register const char *p = src+1; + Tcl_UniChar unichar; + int result; + int count; + char buf[TCL_UTF_MAX]; + + if (numBytes == 0) { + if (readPtr != NULL) { + *readPtr = 0; + } + return 0; + } + + if (dst == NULL) { + dst = buf; + } + + if (numBytes == 1) { + /* + * Can only scan the backslash, so return it. + */ + + result = '\\'; + count = 1; + goto done; + } + + count = 2; + switch (*p) { + /* + * Note: in the conversions below, use absolute values (e.g., 0xa) + * rather than symbolic values (e.g. \n) that get converted by the + * compiler. It's possible that compilers on some platforms will do + * the symbolic conversions differently, which could result in + * non-portable Tcl scripts. + */ + + case 'a': + result = 0x7; + break; + case 'b': + result = 0x8; + break; + case 'f': + result = 0xc; + break; + case 'n': + result = 0xa; + break; + case 'r': + result = 0xd; + break; + case 't': + result = 0x9; + break; + case 'v': + result = 0xb; + break; + case 'x': + count += TclParseHex(p+1, (numBytes > 3) ? 2 : numBytes-2, &result); + if (count == 2) { + /* + * No hexadigits -> This is just "x". + */ + + result = 'x'; + } else { + /* + * Keep only the last byte (2 hex digits). + */ + result = (unsigned char) result; + } + break; + case 'u': + count += TclParseHex(p+1, (numBytes > 5) ? 4 : numBytes-2, &result); + if (count == 2) { + /* + * No hexadigits -> This is just "u". + */ + result = 'u'; + } + break; + case 'U': + count += TclParseHex(p+1, (numBytes > 9) ? 8 : numBytes-2, &result); + if (count == 2) { + /* + * No hexadigits -> This is just "U". + */ + result = 'U'; + } + break; + case '\n': + count--; + do { + p++; + count++; + } while ((count < numBytes) && ((*p == ' ') || (*p == '\t'))); + result = ' '; + break; + case 0: + result = '\\'; + count = 1; + break; + default: + /* + * Check for an octal number \oo?o? + */ + + if (isdigit(UCHAR(*p)) && (UCHAR(*p) < '8')) { /* INTL: digit */ + result = *p - '0'; + p++; + if ((numBytes == 2) || !isdigit(UCHAR(*p)) /* INTL: digit */ + || (UCHAR(*p) >= '8')) { + break; + } + count = 3; + result = (result << 3) + (*p - '0'); + p++; + if ((numBytes == 3) || !isdigit(UCHAR(*p)) /* INTL: digit */ + || (UCHAR(*p) >= '8') || (result >= 0x20)) { + break; + } + count = 4; + result = UCHAR((result << 3) + (*p - '0')); + break; + } + + /* + * We have to convert here in case the user has put a backslash in + * front of a multi-byte utf-8 character. While this means nothing + * special, we shouldn't break up a correct utf-8 character. [Bug + * #217987] test subst-3.2 + */ + + if (Tcl_UtfCharComplete(p, numBytes - 1)) { + count = Tcl_UtfToUniChar(p, &unichar) + 1; /* +1 for '\' */ + } else { + char utfBytes[TCL_UTF_MAX]; + + memcpy(utfBytes, p, (size_t) (numBytes - 1)); + utfBytes[numBytes - 1] = '\0'; + count = Tcl_UtfToUniChar(utfBytes, &unichar) + 1; + } + result = unichar; + break; + } + + done: + if (readPtr != NULL) { + *readPtr = count; + } + return Tcl_UniCharToUtf(result, dst); +} + +/* + *---------------------------------------------------------------------- + * + * ParseComment -- + * + * Scans up to numBytes bytes starting at src, consuming a Tcl comment as + * defined by Tcl's parsing rules. + * + * Results: + * Records in parsePtr information about the parse. Returns the number of + * bytes consumed. + * + * Side effects: + * None. + * + *---------------------------------------------------------------------- + */ + +static int +ParseComment( + const char *src, /* First character to parse. */ + register int numBytes, /* Max number of bytes to scan. */ + Tcl_Parse *parsePtr) /* Information about parse in progress. + * Updated if parsing indicates an incomplete + * command. */ +{ + register const char *p = src; + int incomplete = parsePtr->incomplete; + + while (numBytes) { + int scanned = ParseAllWhiteSpace(p, numBytes, &incomplete); + p += scanned; + numBytes -= scanned; + + if ((numBytes == 0) || (*p != '#')) { + break; + } + if (parsePtr->commentStart == NULL) { + parsePtr->commentStart = p; + } + + p++; + numBytes--; + while (numBytes) { + if (*p == '\n') { + p++; + numBytes--; + break; + } + if (*p == '\\') { + p++; + numBytes--; + if (numBytes == 0) { + break; + } + } + incomplete = (*p == '\n'); + p++; + numBytes--; + } + parsePtr->commentSize = p - parsePtr->commentStart; + } + parsePtr->incomplete = incomplete; + return (p - src); +} + +/* + *---------------------------------------------------------------------- + * + * ParseTokens -- + * + * This function forms the heart of the Tcl parser. It parses one or more + * tokens from a string, up to a termination point specified by the + * caller. This function is used to parse unquoted command words (those + * not in quotes or braces), words in quotes, and array indices for + * variables. No more than numBytes bytes will be scanned. + * + * Results: + * Tokens are added to parsePtr and parsePtr->term is filled in with the + * address of the character that terminated the parse (the first one + * whose CHAR_TYPE matched mask or the character at parsePtr->end). The + * return value is TCL_OK if the parse completed successfully and + * TCL_ERROR otherwise. If a parse error occurs and parsePtr->interp is + * not NULL, then an error message is left in the interpreter's result. + * + * Side effects: + * None. + * + *---------------------------------------------------------------------- + */ + +static int +ParseTokens( + register const char *src, /* First character to parse. */ + register int numBytes, /* Max number of bytes to scan. */ + int mask, /* Specifies when to stop parsing. The parse + * stops at the first unquoted character whose + * CHAR_TYPE contains any of the bits in + * mask. */ + int flags, /* OR-ed bits indicating what substitutions to + * perform: TCL_SUBST_COMMANDS, + * TCL_SUBST_VARIABLES, and + * TCL_SUBST_BACKSLASHES */ + Tcl_Parse *parsePtr) /* Information about parse in progress. + * Updated with additional tokens and + * termination information. */ +{ + char type; + int originalTokens; + int noSubstCmds = !(flags & TCL_SUBST_COMMANDS); + int noSubstVars = !(flags & TCL_SUBST_VARIABLES); + int noSubstBS = !(flags & TCL_SUBST_BACKSLASHES); + Tcl_Token *tokenPtr; + + /* + * Each iteration through the following loop adds one token of type + * TCL_TOKEN_TEXT, TCL_TOKEN_BS, TCL_TOKEN_COMMAND, or TCL_TOKEN_VARIABLE + * to parsePtr. For TCL_TOKEN_VARIABLE tokens, additional tokens are added + * for the parsed variable name. + */ + + originalTokens = parsePtr->numTokens; + while (numBytes && !((type = CHAR_TYPE(*src)) & mask)) { + TclGrowParseTokenArray(parsePtr, 1); + tokenPtr = &parsePtr->tokenPtr[parsePtr->numTokens]; + tokenPtr->start = src; + tokenPtr->numComponents = 0; + + if ((type & TYPE_SUBS) == 0) { + /* + * This is a simple range of characters. Scan to find the end of + * the range. + */ + + while ((++src, --numBytes) + && !(CHAR_TYPE(*src) & (mask | TYPE_SUBS))) { + /* empty loop */ + } + tokenPtr->type = TCL_TOKEN_TEXT; + tokenPtr->size = src - tokenPtr->start; + parsePtr->numTokens++; + } else if (*src == '$') { + int varToken; + + if (noSubstVars) { + tokenPtr->type = TCL_TOKEN_TEXT; + tokenPtr->size = 1; + parsePtr->numTokens++; + src++; + numBytes--; + continue; + } + + /* + * This is a variable reference. Call Tcl_ParseVarName to do all + * the dirty work of parsing the name. + */ + + varToken = parsePtr->numTokens; + if (Tcl_ParseVarName(parsePtr->interp, src, numBytes, parsePtr, + 1) != TCL_OK) { + return TCL_ERROR; + } + src += parsePtr->tokenPtr[varToken].size; + numBytes -= parsePtr->tokenPtr[varToken].size; + } else if (*src == '[') { + Tcl_Parse *nestedPtr; + + if (noSubstCmds) { + tokenPtr->type = TCL_TOKEN_TEXT; + tokenPtr->size = 1; + parsePtr->numTokens++; + src++; + numBytes--; + continue; + } + + /* + * Command substitution. Call Tcl_ParseCommand recursively (and + * repeatedly) to parse the nested command(s), then throw away the + * parse information. + */ + + src++; + numBytes--; + nestedPtr = TclStackAlloc(parsePtr->interp, sizeof(Tcl_Parse)); + while (1) { + if (Tcl_ParseCommand(parsePtr->interp, src, numBytes, 1, + nestedPtr) != TCL_OK) { + parsePtr->errorType = nestedPtr->errorType; + parsePtr->term = nestedPtr->term; + parsePtr->incomplete = nestedPtr->incomplete; + TclStackFree(parsePtr->interp, nestedPtr); + return TCL_ERROR; + } + src = nestedPtr->commandStart + nestedPtr->commandSize; + numBytes = parsePtr->end - src; + Tcl_FreeParse(nestedPtr); + + /* + * Check for the closing ']' that ends the command + * substitution. It must have been the last character of the + * parsed command. + */ + + if ((nestedPtr->term < parsePtr->end) + && (*(nestedPtr->term) == ']') + && !(nestedPtr->incomplete)) { + break; + } + if (numBytes == 0) { + if (parsePtr->interp != NULL) { + Tcl_SetObjResult(parsePtr->interp, Tcl_NewStringObj( + "missing close-bracket", -1)); + } + parsePtr->errorType = TCL_PARSE_MISSING_BRACKET; + parsePtr->term = tokenPtr->start; + parsePtr->incomplete = 1; + TclStackFree(parsePtr->interp, nestedPtr); + return TCL_ERROR; + } + } + TclStackFree(parsePtr->interp, nestedPtr); + tokenPtr->type = TCL_TOKEN_COMMAND; + tokenPtr->size = src - tokenPtr->start; + parsePtr->numTokens++; + } else if (*src == '\\') { + if (noSubstBS) { + tokenPtr->type = TCL_TOKEN_TEXT; + tokenPtr->size = 1; + parsePtr->numTokens++; + src++; + numBytes--; + continue; + } + + /* + * Backslash substitution. + */ + + TclParseBackslash(src, numBytes, &tokenPtr->size, NULL); + + if (tokenPtr->size == 1) { + /* + * Just a backslash, due to end of string. + */ + + tokenPtr->type = TCL_TOKEN_TEXT; + parsePtr->numTokens++; + src++; + numBytes--; + continue; + } + + if (src[1] == '\n') { + if (numBytes == 2) { + parsePtr->incomplete = 1; + } + + /* + * Note: backslash-newline is special in that it is treated + * the same as a space character would be. This means that it + * could terminate the token. + */ + + if (mask & TYPE_SPACE) { + if (parsePtr->numTokens == originalTokens) { + goto finishToken; + } + break; + } + } + + tokenPtr->type = TCL_TOKEN_BS; + parsePtr->numTokens++; + src += tokenPtr->size; + numBytes -= tokenPtr->size; + } else if (*src == 0) { + tokenPtr->type = TCL_TOKEN_TEXT; + tokenPtr->size = 1; + parsePtr->numTokens++; + src++; + numBytes--; + } else { + Tcl_Panic("ParseTokens encountered unknown character"); + } + } + if (parsePtr->numTokens == originalTokens) { + /* + * There was nothing in this range of text. Add an empty token for the + * empty range, so that there is always at least one token added. + */ + + TclGrowParseTokenArray(parsePtr, 1); + tokenPtr = &parsePtr->tokenPtr[parsePtr->numTokens]; + tokenPtr->start = src; + tokenPtr->numComponents = 0; + + finishToken: + tokenPtr->type = TCL_TOKEN_TEXT; + tokenPtr->size = 0; + parsePtr->numTokens++; + } + parsePtr->term = src; + return TCL_OK; +} + +/* + *---------------------------------------------------------------------- + * + * Tcl_FreeParse -- + * + * This function is invoked to free any dynamic storage that may have + * been allocated by a previous call to Tcl_ParseCommand. + * + * Results: + * None. + * + * Side effects: + * If there is any dynamically allocated memory in *parsePtr, it is + * freed. + * + *---------------------------------------------------------------------- + */ + +void +Tcl_FreeParse( + Tcl_Parse *parsePtr) /* Structure that was filled in by a previous + * call to Tcl_ParseCommand. */ +{ + if (parsePtr->tokenPtr != parsePtr->staticTokens) { + ckfree(parsePtr->tokenPtr); + parsePtr->tokenPtr = parsePtr->staticTokens; + } +} + +/* + *---------------------------------------------------------------------- + * + * Tcl_ParseVarName -- + * + * Given a string starting with a $ sign, parse off a variable name and + * return information about the parse. No more than 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, tokenPtr + * and numTokens fields of parsePtr are filled in with information about + * the variable name that was parsed. The "size" field of the first new + * token gives the total number of bytes in the variable name. Other + * fields in parsePtr are undefined. + * + * Side effects: + * If there is insufficient space in parsePtr to hold all the information + * about the command, then additional space is malloc-ed. If the function + * returns TCL_OK then the caller must eventually invoke Tcl_FreeParse to + * release any additional space that was allocated. + * + *---------------------------------------------------------------------- + */ + +int +Tcl_ParseVarName( + Tcl_Interp *interp, /* Interpreter to use for error reporting; if + * NULL, then no error message is provided. */ + const char *start, /* Start of variable substitution string. + * First character must be "$". */ + register int numBytes, /* Total 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 in with information about + * the variable name. */ + int append) /* Non-zero means append tokens to existing + * information in parsePtr; zero means ignore + * existing tokens in parsePtr and + * reinitialize it. */ +{ + Tcl_Token *tokenPtr; + register const char *src; + int varIndex; + unsigned array; + + if ((numBytes == 0) || (start == NULL)) { + return TCL_ERROR; + } + if (numBytes < 0) { + numBytes = strlen(start); + } + + if (!append) { + TclParseInit(interp, start, numBytes, parsePtr); + } + + /* + * Generate one token for the variable, an additional token for the name, + * plus any number of additional tokens for the index, if there is one. + */ + + src = start; + TclGrowParseTokenArray(parsePtr, 2); + tokenPtr = &parsePtr->tokenPtr[parsePtr->numTokens]; + tokenPtr->type = TCL_TOKEN_VARIABLE; + tokenPtr->start = src; + varIndex = parsePtr->numTokens; + parsePtr->numTokens++; + tokenPtr++; + src++; + numBytes--; + if (numBytes == 0) { + goto justADollarSign; + } + tokenPtr->type = TCL_TOKEN_TEXT; + tokenPtr->start = src; + tokenPtr->numComponents = 0; + + /* + * The name of the variable can have three forms: + * 1. The $ sign is followed by an open curly brace. Then the variable + * name is everything up to the next close curly brace, and the + * variable is a scalar variable. + * 2. The $ sign is not followed by an open curly brace. Then the variable + * name is everything up to the next character that isn't a letter, + * digit, or underscore. :: sequences are also considered part of the + * variable name, in order to support namespaces. If the following + * character is an open parenthesis, then the information between + * parentheses is the array element name. + * 3. The $ sign is followed by something that isn't a letter, digit, or + * underscore: in this case, there is no variable name and the token is + * just "$". + */ + + if (*src == '{') { + src++; + numBytes--; + tokenPtr->type = TCL_TOKEN_TEXT; + tokenPtr->start = src; + tokenPtr->numComponents = 0; + + while (numBytes && (*src != '}')) { + numBytes--; + src++; + } + if (numBytes == 0) { + if (parsePtr->interp != NULL) { + Tcl_SetObjResult(parsePtr->interp, Tcl_NewStringObj( + "missing close-brace for variable name", -1)); + } + parsePtr->errorType = TCL_PARSE_MISSING_VAR_BRACE; + parsePtr->term = tokenPtr->start-1; + parsePtr->incomplete = 1; + goto error; + } + tokenPtr->size = src - tokenPtr->start; + tokenPtr[-1].size = src - tokenPtr[-1].start; + parsePtr->numTokens++; + src++; + } else { + tokenPtr->type = TCL_TOKEN_TEXT; + tokenPtr->start = src; + tokenPtr->numComponents = 0; + + while (numBytes) { + if (TclIsBareword(*src)) { + src += 1; + numBytes -= 1; + continue; + } + if ((src[0] == ':') && (numBytes != 1) && (src[1] == ':')) { + src += 2; + numBytes -= 2; + while (numBytes && (*src == ':')) { + src++; + numBytes--; + } + continue; + } + break; + } + + /* + * Support for empty array names here. + */ + + array = (numBytes && (*src == '(')); + tokenPtr->size = src - tokenPtr->start; + if ((tokenPtr->size == 0) && !array) { + goto justADollarSign; + } + parsePtr->numTokens++; + if (array) { + /* + * This is a reference to an array element. Call ParseTokens + * recursively to parse the element name, since it could contain + * any number of substitutions. + */ + + if (TCL_OK != ParseTokens(src+1, numBytes-1, TYPE_CLOSE_PAREN, + TCL_SUBST_ALL, parsePtr)) { + goto error; + } + if ((parsePtr->term == src+numBytes) || (*parsePtr->term != ')')){ + if (parsePtr->interp != NULL) { + Tcl_SetObjResult(parsePtr->interp, Tcl_NewStringObj( + "missing )", -1)); + } + parsePtr->errorType = TCL_PARSE_MISSING_PAREN; + parsePtr->term = src; + parsePtr->incomplete = 1; + goto error; + } + src = parsePtr->term + 1; + } + } + tokenPtr = &parsePtr->tokenPtr[varIndex]; + tokenPtr->size = src - tokenPtr->start; + tokenPtr->numComponents = parsePtr->numTokens - (varIndex + 1); + return TCL_OK; + + /* + * The dollar sign isn't followed by a variable name. Replace the + * TCL_TOKEN_VARIABLE token with a TCL_TOKEN_TEXT token for the dollar + * sign. + */ + + justADollarSign: + tokenPtr = &parsePtr->tokenPtr[varIndex]; + tokenPtr->type = TCL_TOKEN_TEXT; + tokenPtr->size = 1; + tokenPtr->numComponents = 0; + return TCL_OK; + + error: + Tcl_FreeParse(parsePtr); + return TCL_ERROR; +} + +/* + *---------------------------------------------------------------------- + * + * Tcl_ParseVar -- + * + * Given a string starting with a $ sign, parse off a variable name and + * return its value. + * + * Results: + * The return value is the contents of the variable given by the leading + * characters of string. If termPtr isn't NULL, *termPtr gets filled in + * with the address of the character just after the last one in the + * variable specifier. If the variable doesn't exist, then the return + * value is NULL and an error message will be left in interp's result. + * + * Side effects: + * None. + * + *---------------------------------------------------------------------- + */ + +const char * +Tcl_ParseVar( + Tcl_Interp *interp, /* Context for looking up variable. */ + register const char *start, /* Start of variable substitution. First + * character must be "$". */ + const char **termPtr) /* If non-NULL, points to word to fill in with + * character just after last one in the + * variable specifier. */ +{ + register Tcl_Obj *objPtr; + int code; + Tcl_Parse *parsePtr = TclStackAlloc(interp, sizeof(Tcl_Parse)); + + if (Tcl_ParseVarName(interp, start, -1, parsePtr, 0) != TCL_OK) { + TclStackFree(interp, parsePtr); + return NULL; + } + + if (termPtr != NULL) { + *termPtr = start + parsePtr->tokenPtr->size; + } + if (parsePtr->numTokens == 1) { + /* + * There isn't a variable name after all: the $ is just a $. + */ + + TclStackFree(interp, parsePtr); + return "$"; + } + + code = TclSubstTokens(interp, parsePtr->tokenPtr, parsePtr->numTokens, + NULL, 1, NULL, NULL); + Tcl_FreeParse(parsePtr); + TclStackFree(interp, parsePtr); + if (code != TCL_OK) { + return NULL; + } + objPtr = Tcl_GetObjResult(interp); + + /* + * At this point we should have an object containing the value of a + * variable. Just return the string from that object. + * + * Since TclSubstTokens above returned TCL_OK, we know that objPtr + * is shared. It is in both the interp result and the value of the + * variable. Returning the string relies on that to be true. + */ + + assert( Tcl_IsShared(objPtr) ); + + Tcl_ResetResult(interp); + return TclGetString(objPtr); +} + +/* + *---------------------------------------------------------------------- + * + * Tcl_ParseBraces -- + * + * Given a string in braces such as a Tcl command argument or a string + * value in a Tcl expression, this function parses the string and returns + * information about the parse. No more than numBytes bytes will be + * scanned. + * + * Results: + * The return value is TCL_OK if the string 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, tokenPtr + * and numTokens fields of parsePtr are filled in with information about + * the string that was parsed. Other fields in parsePtr are undefined. + * termPtr is set to point to the character just after the last one in + * the braced string. + * + * Side effects: + * If there is insufficient space in parsePtr to hold all the information + * about the command, then additional space is malloc-ed. If the function + * returns TCL_OK then the caller must eventually invoke Tcl_FreeParse to + * release any additional space that was allocated. + * + *---------------------------------------------------------------------- + */ + +int +Tcl_ParseBraces( + Tcl_Interp *interp, /* Interpreter to use for error reporting; if + * NULL, then no error message is provided. */ + const char *start, /* Start of string enclosed in braces. The + * first character must be {'. */ + register int numBytes, /* Total number of bytes in string. If < 0, + * the string consists of all bytes up to the + * first null character. */ + register Tcl_Parse *parsePtr, + /* Structure to fill in with information about + * the string. */ + int append, /* Non-zero means append tokens to existing + * information in parsePtr; zero means ignore + * existing tokens in parsePtr and + * reinitialize it. */ + const char **termPtr) /* If non-NULL, points to word in which to + * store a pointer to the character just after + * the terminating '}' if the parse was + * successful. */ +{ + Tcl_Token *tokenPtr; + register const char *src; + int startIndex, level, length; + + if ((numBytes == 0) || (start == NULL)) { + return TCL_ERROR; + } + if (numBytes < 0) { + numBytes = strlen(start); + } + + if (!append) { + TclParseInit(interp, start, numBytes, parsePtr); + } + + src = start; + startIndex = parsePtr->numTokens; + + TclGrowParseTokenArray(parsePtr, 1); + tokenPtr = &parsePtr->tokenPtr[startIndex]; + tokenPtr->type = TCL_TOKEN_TEXT; + tokenPtr->start = src+1; + tokenPtr->numComponents = 0; + level = 1; + while (1) { + while (++src, --numBytes) { + if (CHAR_TYPE(*src) != TYPE_NORMAL) { + break; + } + } + if (numBytes == 0) { + goto missingBraceError; + } + + switch (*src) { + case '{': + level++; + break; + case '}': + if (--level == 0) { + /* + * Decide if we need to finish emitting a partially-finished + * token. There are 3 cases: + * {abc \newline xyz} or {xyz} + * - finish emitting "xyz" token + * {abc \newline} + * - don't emit token after \newline + * {} - finish emitting zero-sized token + * + * The last case ensures that there is a token (even if empty) + * that describes the braced string. + */ + + if ((src != tokenPtr->start) + || (parsePtr->numTokens == startIndex)) { + tokenPtr->size = (src - tokenPtr->start); + parsePtr->numTokens++; + } + if (termPtr != NULL) { + *termPtr = src+1; + } + return TCL_OK; + } + break; + case '\\': + TclParseBackslash(src, numBytes, &length, NULL); + if ((length > 1) && (src[1] == '\n')) { + /* + * A backslash-newline sequence must be collapsed, even inside + * braces, so we have to split the word into multiple tokens + * so that the backslash-newline can be represented + * explicitly. + */ + + if (numBytes == 2) { + parsePtr->incomplete = 1; + } + tokenPtr->size = (src - tokenPtr->start); + if (tokenPtr->size != 0) { + parsePtr->numTokens++; + } + TclGrowParseTokenArray(parsePtr, 2); + tokenPtr = &parsePtr->tokenPtr[parsePtr->numTokens]; + tokenPtr->type = TCL_TOKEN_BS; + tokenPtr->start = src; + tokenPtr->size = length; + tokenPtr->numComponents = 0; + parsePtr->numTokens++; + + src += length - 1; + numBytes -= length - 1; + tokenPtr++; + tokenPtr->type = TCL_TOKEN_TEXT; + tokenPtr->start = src + 1; + tokenPtr->numComponents = 0; + } else { + src += length - 1; + numBytes -= length - 1; + } + break; + } + } + + missingBraceError: + parsePtr->errorType = TCL_PARSE_MISSING_BRACE; + parsePtr->term = start; + parsePtr->incomplete = 1; + if (parsePtr->interp == NULL) { + /* + * Skip straight to the exit code since we have no interpreter to put + * error message in. + */ + + goto error; + } + + Tcl_SetObjResult(parsePtr->interp, Tcl_NewStringObj( + "missing close-brace", -1)); + + /* + * Guess if the problem is due to comments by searching the source string + * for a possible open brace within the context of a comment. Since we + * aren't performing a full Tcl parse, just look for an open brace + * preceded by a '<whitespace>#' on the same line. + */ + + { + register int openBrace = 0; + + while (--src > start) { + switch (*src) { + case '{': + openBrace = 1; + break; + case '\n': + openBrace = 0; + break; + case '#' : + if (openBrace && TclIsSpaceProc(src[-1])) { + Tcl_AppendToObj(Tcl_GetObjResult(parsePtr->interp), + ": possible unbalanced brace in comment", -1); + goto error; + } + break; + } + } + } + + error: + Tcl_FreeParse(parsePtr); + return TCL_ERROR; +} + +/* + *---------------------------------------------------------------------- + * + * Tcl_ParseQuotedString -- + * + * Given a double-quoted string such as a quoted Tcl command argument or + * a quoted value in a Tcl expression, this function parses the string + * and returns information about the parse. No more than numBytes bytes + * will be scanned. + * + * Results: + * The return value is TCL_OK if the string 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, tokenPtr + * and numTokens fields of parsePtr are filled in with information about + * the string that was parsed. Other fields in parsePtr are undefined. + * termPtr is set to point to the character just after the quoted + * string's terminating close-quote. + * + * Side effects: + * If there is insufficient space in parsePtr to hold all the information + * about the command, then additional space is malloc-ed. If the function + * returns TCL_OK then the caller must eventually invoke Tcl_FreeParse to + * release any additional space that was allocated. + * + *---------------------------------------------------------------------- + */ + +int +Tcl_ParseQuotedString( + Tcl_Interp *interp, /* Interpreter to use for error reporting; if + * NULL, then no error message is provided. */ + const char *start, /* Start of the quoted string. The first + * character must be '"'. */ + register int numBytes, /* Total number of bytes in string. If < 0, + * the string consists of all bytes up to the + * first null character. */ + register Tcl_Parse *parsePtr, + /* Structure to fill in with information about + * the string. */ + int append, /* Non-zero means append tokens to existing + * information in parsePtr; zero means ignore + * existing tokens in parsePtr and + * reinitialize it. */ + const char **termPtr) /* If non-NULL, points to word in which to + * store a pointer to the character just after + * the quoted string's terminating close-quote + * if the parse succeeds. */ +{ + if ((numBytes == 0) || (start == NULL)) { + return TCL_ERROR; + } + if (numBytes < 0) { + numBytes = strlen(start); + } + + if (!append) { + TclParseInit(interp, start, numBytes, parsePtr); + } + + if (TCL_OK != ParseTokens(start+1, numBytes-1, TYPE_QUOTE, TCL_SUBST_ALL, + parsePtr)) { + goto error; + } + if (*parsePtr->term != '"') { + if (parsePtr->interp != NULL) { + Tcl_SetObjResult(parsePtr->interp, Tcl_NewStringObj( + "missing \"", -1)); + } + parsePtr->errorType = TCL_PARSE_MISSING_QUOTE; + parsePtr->term = start; + parsePtr->incomplete = 1; + goto error; + } + if (termPtr != NULL) { + *termPtr = (parsePtr->term + 1); + } + return TCL_OK; + + error: + Tcl_FreeParse(parsePtr); + return TCL_ERROR; +} + +/* + *---------------------------------------------------------------------- + * + * TclSubstParse -- + * + * Token parser used by the [subst] command. Parses the string made up of + * 'numBytes' bytes starting at 'bytes'. Parsing is controlled by the + * flags argument to provide support for the -nobackslashes, -nocommands, + * and -novariables options, as represented by the flag values + * TCL_SUBST_BACKSLASHES, TCL_SUBST_COMMANDS, TCL_SUBST_VARIABLES. + * + * Results: + * None. + * + * Side effects: + * The Tcl_Parse struct '*parsePtr' is filled with parse results. + * The caller is expected to eventually call Tcl_FreeParse() to properly + * cleanup the value written there. + * + * If a parse error occurs, the Tcl_InterpState value '*statePtr' is + * filled with the state created by that error. When *statePtr is written + * to, the caller is expected to make the required calls to either + * Tcl_RestoreInterpState() or Tcl_DiscardInterpState() to dispose of the + * value written there. + * + *---------------------------------------------------------------------- + */ + +void +TclSubstParse( + Tcl_Interp *interp, + const char *bytes, + int numBytes, + int flags, + Tcl_Parse *parsePtr, + Tcl_InterpState *statePtr) +{ + int length = numBytes; + const char *p = bytes; + + TclParseInit(interp, p, length, parsePtr); + + /* + * First parse the string rep of objPtr, as if it were enclosed as a + * "-quoted word in a normal Tcl command. Honor flags that selectively + * inhibit types of substitution. + */ + + if (TCL_OK != ParseTokens(p, length, /* mask */ 0, flags, parsePtr)) { + /* + * There was a parse error. Save the interpreter state for possible + * error reporting later. + */ + + *statePtr = Tcl_SaveInterpState(interp, TCL_ERROR); + + /* + * We need to re-parse to get the portion of the string we can [subst] + * before the parse error. Sadly, all the Tcl_Token's created by the + * first parse attempt are gone, freed according to the public spec + * for the Tcl_Parse* routines. The only clue we have is parse.term, + * which points to either the unmatched opener, or to characters that + * follow a close brace or close quote. + * + * Call ParseTokens again, working on the string up to parse.term. + * Keep repeating until we get a good parse on a prefix. + */ + + do { + parsePtr->numTokens = 0; + parsePtr->tokensAvailable = NUM_STATIC_TOKENS; + parsePtr->end = parsePtr->term; + parsePtr->incomplete = 0; + parsePtr->errorType = TCL_PARSE_SUCCESS; + } while (TCL_OK != + ParseTokens(p, parsePtr->end - p, 0, flags, parsePtr)); + + /* + * The good parse will have to be followed by {, (, or [. + */ + + switch (*(parsePtr->term)) { + case '{': + /* + * Parse error was a missing } in a ${varname} variable + * substitution at the toplevel. We will subst everything up to + * that broken variable substitution before reporting the parse + * error. Substituting the leftover '$' will have no side-effects, + * so the current token stream is fine. + */ + break; + + case '(': + /* + * Parse error was during the parsing of the index part of an + * array variable substitution at the toplevel. + */ + + if (*(parsePtr->term - 1) == '$') { + /* + * Special case where removing the array index left us with + * just a dollar sign (array variable with name the empty + * string as its name), instead of with a scalar variable + * reference. + * + * As in the previous case, existing token stream is OK. + */ + } else { + /* + * The current parse includes a successful parse of a scalar + * variable substitution where there should have been an array + * variable substitution. We remove that mistaken part of the + * parse before moving on. A scalar variable substitution is + * two tokens. + */ + + Tcl_Token *varTokenPtr = + parsePtr->tokenPtr + parsePtr->numTokens - 2; + + if (varTokenPtr->type != TCL_TOKEN_VARIABLE) { + Tcl_Panic("TclSubstParse: programming error"); + } + if (varTokenPtr[1].type != TCL_TOKEN_TEXT) { + Tcl_Panic("TclSubstParse: programming error"); + } + parsePtr->numTokens -= 2; + } + break; + case '[': + /* + * Parse error occurred during parsing of a toplevel command + * substitution. + */ + + parsePtr->end = p + length; + p = parsePtr->term + 1; + length = parsePtr->end - p; + if (length == 0) { + /* + * No commands, just an unmatched [. As in previous cases, + * existing token stream is OK. + */ + } else { + /* + * We want to add the parsing of as many commands as we can + * within that substitution until we reach the actual parse + * error. We'll do additional parsing to determine what length + * to claim for the final TCL_TOKEN_COMMAND token. + */ + + Tcl_Token *tokenPtr; + const char *lastTerm = parsePtr->term; + Tcl_Parse *nestedPtr = + TclStackAlloc(interp, sizeof(Tcl_Parse)); + + while (TCL_OK == + Tcl_ParseCommand(NULL, p, length, 0, nestedPtr)) { + Tcl_FreeParse(nestedPtr); + p = nestedPtr->term + (nestedPtr->term < nestedPtr->end); + length = nestedPtr->end - p; + if ((length == 0) && (nestedPtr->term == nestedPtr->end)) { + /* + * If we run out of string, blame the missing close + * bracket on the last command, and do not evaluate it + * during substitution. + */ + + break; + } + lastTerm = nestedPtr->term; + } + TclStackFree(interp, nestedPtr); + + if (lastTerm == parsePtr->term) { + /* + * Parse error in first command. No commands to subst, add + * no more tokens. + */ + break; + } + + /* + * Create a command substitution token for whatever commands + * got parsed. + */ + + TclGrowParseTokenArray(parsePtr, 1); + tokenPtr = &(parsePtr->tokenPtr[parsePtr->numTokens]); + tokenPtr->start = parsePtr->term; + tokenPtr->numComponents = 0; + tokenPtr->type = TCL_TOKEN_COMMAND; + tokenPtr->size = lastTerm - tokenPtr->start + 1; + parsePtr->numTokens++; + } + break; + + default: + Tcl_Panic("bad parse in TclSubstParse: %c", p[length]); + } + } +} + +/* + *---------------------------------------------------------------------- + * + * TclSubstTokens -- + * + * Accepts an array of count Tcl_Token's, and creates a result value in + * the interp from concatenating the results of performing Tcl + * substitution on each Tcl_Token. Substitution is interrupted if any + * non-TCL_OK completion code arises. + * + * Results: + * The return value is a standard Tcl completion code. The result in + * interp is the substituted value, or an error message if TCL_ERROR is + * returned. If tokensLeftPtr is not NULL, then it points to an int where + * the number of tokens remaining to be processed is written. + * + * Side effects: + * Can be anything, depending on the types of substitution done. + * + *---------------------------------------------------------------------- + */ + +int +TclSubstTokens( + Tcl_Interp *interp, /* Interpreter in which to lookup variables, + * execute nested commands, and report + * errors. */ + Tcl_Token *tokenPtr, /* Pointer to first in an array of tokens to + * evaluate and concatenate. */ + int count, /* Number of tokens to consider at tokenPtr. + * Must be at least 1. */ + int *tokensLeftPtr, /* If not NULL, points to memory where an + * integer representing the number of tokens + * left to be substituted will be written */ + int line, /* The line the script starts on. */ + int *clNextOuter, /* Information about an outer context for */ + const char *outerScript) /* continuation line data. This is set by + * EvalEx() to properly handle [...]-nested + * commands. The 'outerScript' refers to the + * most-outer script containing the embedded + * command, which is refered to by 'script'. + * The 'clNextOuter' refers to the current + * entry in the table of continuation lines in + * this "master script", and the character + * offsets are relative to the 'outerScript' + * as well. + * + * If outerScript == script, then this call is + * for words in the outer-most script or + * command. See Tcl_EvalEx and TclEvalObjEx + * for the places generating arguments for + * which this is true. */ +{ + Tcl_Obj *result; + int code = TCL_OK; +#define NUM_STATIC_POS 20 + int isLiteral, maxNumCL, numCL, i, adjust; + int *clPosition = NULL; + Interp *iPtr = (Interp *) interp; + int inFile = iPtr->evalFlags & TCL_EVAL_FILE; + + /* + * Each pass through this loop will substitute one token, and its + * components, if any. The only thing tricky here is that we go to some + * effort to pass Tcl_Obj's through untouched, to avoid string copying and + * Tcl_Obj creation if possible, to aid performance and limit shimmering. + * + * Further optimization opportunities might be to check for the equivalent + * of Tcl_SetObjResult(interp, Tcl_GetObjResult(interp)) and omit them. + */ + + /* + * For the handling of continuation lines in literals we first check if + * this is actually a literal. For if not we can forego the additional + * processing. Otherwise we pre-allocate a small table to store the + * locations of all continuation lines we find in this literal, if any. + * The table is extended if needed. + */ + + numCL = 0; + maxNumCL = 0; + isLiteral = 1; + for (i=0 ; i < count; i++) { + if ((tokenPtr[i].type != TCL_TOKEN_TEXT) + && (tokenPtr[i].type != TCL_TOKEN_BS)) { + isLiteral = 0; + break; + } + } + + if (isLiteral) { + maxNumCL = NUM_STATIC_POS; + clPosition = ckalloc(maxNumCL * sizeof(int)); + } + + adjust = 0; + result = NULL; + for (; count>0 && code==TCL_OK ; count--, tokenPtr++) { + Tcl_Obj *appendObj = NULL; + const char *append = NULL; + int appendByteLength = 0; + char utfCharBytes[TCL_UTF_MAX]; + + switch (tokenPtr->type) { + case TCL_TOKEN_TEXT: + append = tokenPtr->start; + appendByteLength = tokenPtr->size; + break; + + case TCL_TOKEN_BS: + appendByteLength = TclParseBackslash(tokenPtr->start, + tokenPtr->size, NULL, utfCharBytes); + append = utfCharBytes; + + /* + * If the backslash sequence we found is in a literal, and + * represented a continuation line, we compute and store its + * location (as char offset to the beginning of the _result_ + * script). We may have to extend the table of locations. + * + * Note that the continuation line information is relevant even if + * the word we are processing is not a literal, as it can affect + * nested commands. See the branch for TCL_TOKEN_COMMAND below, + * where the adjustment we are tracking here is taken into + * account. The good thing is that we do not need a table of + * everything, just the number of lines we have to add as + * correction. + */ + + if ((appendByteLength == 1) && (utfCharBytes[0] == ' ') + && (tokenPtr->start[1] == '\n')) { + if (isLiteral) { + int clPos; + + if (result == 0) { + clPos = 0; + } else { + TclGetStringFromObj(result, &clPos); + } + + if (numCL >= maxNumCL) { + maxNumCL *= 2; + clPosition = ckrealloc(clPosition, + maxNumCL * sizeof(int)); + } + clPosition[numCL] = clPos; + numCL++; + } + adjust++; + } + break; + + case TCL_TOKEN_COMMAND: { + /* TIP #280: Transfer line information to nested command */ + iPtr->numLevels++; + code = TclInterpReady(interp); + if (code == TCL_OK) { + /* + * Test cases: info-30.{6,8,9} + */ + + int theline; + + TclAdvanceContinuations(&line, &clNextOuter, + tokenPtr->start - outerScript); + theline = line + adjust; + code = TclEvalEx(interp, tokenPtr->start+1, tokenPtr->size-2, + 0, theline, clNextOuter, outerScript); + + TclAdvanceLines(&line, tokenPtr->start+1, + tokenPtr->start + tokenPtr->size - 1); + + /* + * Restore flag reset by nested eval for future bracketed + * commands and their cmdframe setup + */ + + if (inFile) { + iPtr->evalFlags |= TCL_EVAL_FILE; + } + } + iPtr->numLevels--; + TclResetCancellation(interp, 0); + appendObj = Tcl_GetObjResult(interp); + break; + } + + case TCL_TOKEN_VARIABLE: { + Tcl_Obj *arrayIndex = NULL; + Tcl_Obj *varName = NULL; + + if (tokenPtr->numComponents > 1) { + /* + * Subst the index part of an array variable reference. + */ + + code = TclSubstTokens(interp, tokenPtr+2, + tokenPtr->numComponents - 1, NULL, line, NULL, NULL); + arrayIndex = Tcl_GetObjResult(interp); + Tcl_IncrRefCount(arrayIndex); + } + + if (code == TCL_OK) { + varName = Tcl_NewStringObj(tokenPtr[1].start, + tokenPtr[1].size); + appendObj = Tcl_ObjGetVar2(interp, varName, arrayIndex, + TCL_LEAVE_ERR_MSG); + Tcl_DecrRefCount(varName); + if (appendObj == NULL) { + code = TCL_ERROR; + } + } + + switch (code) { + case TCL_OK: /* Got value */ + case TCL_ERROR: /* Already have error message */ + case TCL_BREAK: /* Will not substitute anyway */ + case TCL_CONTINUE: /* Will not substitute anyway */ + break; + default: + /* + * All other return codes, we will subst the result from the + * code-throwing evaluation. + */ + + appendObj = Tcl_GetObjResult(interp); + } + + if (arrayIndex != NULL) { + Tcl_DecrRefCount(arrayIndex); + } + count -= tokenPtr->numComponents; + tokenPtr += tokenPtr->numComponents; + break; + } + + default: + Tcl_Panic("unexpected token type in TclSubstTokens: %d", + tokenPtr->type); + } + + if ((code == TCL_BREAK) || (code == TCL_CONTINUE)) { + /* + * Inhibit substitution. + */ + continue; + } + + if (result == NULL) { + /* + * First pass through. If we have a Tcl_Obj, just use it. If not, + * create one from our string. + */ + + if (appendObj != NULL) { + result = appendObj; + } else { + result = Tcl_NewStringObj(append, appendByteLength); + } + Tcl_IncrRefCount(result); + } else { + /* + * Subsequent passes. Append to result. + */ + + if (Tcl_IsShared(result)) { + Tcl_DecrRefCount(result); + result = Tcl_DuplicateObj(result); + Tcl_IncrRefCount(result); + } + if (appendObj != NULL) { + Tcl_AppendObjToObj(result, appendObj); + } else { + Tcl_AppendToObj(result, append, appendByteLength); + } + } + } + + if (code != TCL_ERROR) { /* Keep error message in result! */ + if (result != NULL) { + Tcl_SetObjResult(interp, result); + + /* + * If the code found continuation lines (which implies that this + * word is a literal), then we store the accumulated table of + * locations in the thread-global data structure for the bytecode + * compiler to find later, assuming that the literal is a script + * which will be compiled. + */ + + if (numCL) { + TclContinuationsEnter(result, numCL, clPosition); + } + + /* + * Release the temp table we used to collect the locations of + * continuation lines, if any. + */ + + if (maxNumCL) { + ckfree(clPosition); + } + } else { + Tcl_ResetResult(interp); + } + } + if (tokensLeftPtr != NULL) { + *tokensLeftPtr = count; + } + if (result != NULL) { + Tcl_DecrRefCount(result); + } + return code; +} + +/* + *---------------------------------------------------------------------- + * + * CommandComplete -- + * + * This function is shared by TclCommandComplete and + * Tcl_ObjCommandComplete; it does all the real work of seeing whether a + * script is complete + * + * Results: + * 1 is returned if the script is complete, 0 if there are open + * delimiters such as " or (. 1 is also returned if there is a parse + * error in the script other than unmatched delimiters. + * + * Side effects: + * None. + * + *---------------------------------------------------------------------- + */ + +static inline int +CommandComplete( + const char *script, /* Script to check. */ + int numBytes) /* Number of bytes in script. */ +{ + Tcl_Parse parse; + const char *p, *end; + int result; + + p = script; + end = p + numBytes; + while (Tcl_ParseCommand(NULL, p, end - p, 0, &parse) == TCL_OK) { + p = parse.commandStart + parse.commandSize; + if (p >= end) { + break; + } + Tcl_FreeParse(&parse); + } + if (parse.incomplete) { + result = 0; + } else { + result = 1; + } + Tcl_FreeParse(&parse); + return result; +} + +/* + *---------------------------------------------------------------------- + * + * Tcl_CommandComplete -- + * + * Given a partial or complete Tcl script, this function determines + * whether the script is complete in the sense of having matched braces + * and quotes and brackets. + * + * Results: + * 1 is returned if the script is complete, 0 otherwise. 1 is also + * returned if there is a parse error in the script other than unmatched + * delimiters. + * + * Side effects: + * None. + * + *---------------------------------------------------------------------- + */ + +int +Tcl_CommandComplete( + const char *script) /* Script to check. */ +{ + return CommandComplete(script, (int) strlen(script)); +} + +/* + *---------------------------------------------------------------------- + * + * TclObjCommandComplete -- + * + * Given a partial or complete Tcl command in a Tcl object, this function + * determines whether the command is complete in the sense of having + * matched braces and quotes and brackets. + * + * Results: + * 1 is returned if the command is complete, 0 otherwise. + * + * Side effects: + * None. + * + *---------------------------------------------------------------------- + */ + +int +TclObjCommandComplete( + Tcl_Obj *objPtr) /* Points to object holding script to + * check. */ +{ + int length; + const char *script = TclGetStringFromObj(objPtr, &length); + + return CommandComplete(script, length); +} + +/* + * Local Variables: + * mode: c + * c-basic-offset: 4 + * fill-column: 78 + * End: + */ |