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|
/*
* tclParse.c --
*
* This file contains procedures 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. This file also includes a few additional
* procedures such as Tcl_EvalObjv, Tcl_Eval, and Tcl_Eval2, which
* allow scripts to be evaluated directly, without compiling.
*
* Copyright (c) 1997 Sun Microsystems, Inc.
* Copyright (c) 1998 by Scriptics Corporation.
*
* See the file "license.terms" for information on usage and redistribution
* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
*
* RCS: @(#) $Id: tclParse.c,v 1.1.2.8 1999/02/01 21:29:54 stanton Exp $
*/
#include "tclInt.h"
#include "tclPort.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, open bracket, or null.
* 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).
*/
#define TYPE_NORMAL 0
#define TYPE_SPACE 0x1
#define TYPE_COMMAND_END 0x2
#define TYPE_SUBS 0x4
#define TYPE_QUOTE 0x8
#define TYPE_CLOSE_PAREN 0x10
#define TYPE_CLOSE_BRACK 0x20
#define TYPE_BRACE 0x40
#define CHAR_TYPE(c) (typeTable+128)[(int)(c)]
char typeTable[] = {
/*
* 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 procedures defined in this file:
*/
static int CommandComplete _ANSI_ARGS_((char *script,
int length));
static int ParseTokens _ANSI_ARGS_((char *src, int mask,
Tcl_Parse *parsePtr));
static int EvalObjv _ANSI_ARGS_((Tcl_Interp *interp, int objc,
Tcl_Obj *CONST objv[], char *command, int length,
int flags));
/*
*----------------------------------------------------------------------
*
* Tcl_ParseCommand --
*
* Given a string, this procedure 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 procedure returns TCL_OK then the caller must
* eventually invoke Tcl_FreeParse to release any additional space
* that was allocated.
*
*----------------------------------------------------------------------
*/
int
Tcl_ParseCommand(interp, string, numBytes, nested, parsePtr)
Tcl_Interp *interp; /* Interpreter to use for error reporting;
* if NULL, then no error message is
* provided. */
char *string; /* First character of string containing
* one or more Tcl commands. The string
* must be in writable memory and must
* have one additional byte of space at
* string[length] where we can
* temporarily store a 0 sentinel
* character. */
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 char *src; /* Points to current character
* in the command. */
int 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. */
char utfBytes[TCL_UTF_MAX]; /* Holds result of backslash substitution. */
int terminators; /* CHAR_TYPE bits that indicate the end
* of a command. */
char *termPtr; /* Set by Tcl_ParseBraces/QuotedString to
* point to char after terminating one. */
int length, savedChar;
if (numBytes < 0) {
numBytes = (string? strlen(string) : 0);
}
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->incomplete = 0;
if (nested != 0) {
terminators = TYPE_COMMAND_END | TYPE_CLOSE_BRACK;
} else {
terminators = TYPE_COMMAND_END;
}
/*
* Temporarily overwrite the character just after the end of the
* string with a 0 byte. This acts as a sentinel and reduces the
* number of places where we have to check for the end of the
* input string. The original value of the byte is restored at
* the end of the parse.
*/
savedChar = string[numBytes];
string[numBytes] = 0;
/*
* Parse any leading space and comments before the first word of the
* command.
*/
src = string;
while (1) {
while ((CHAR_TYPE(*src) == TYPE_SPACE) || (*src == '\n')) {
src++;
}
if ((*src == '\\') && (src[1] == '\n')) {
/*
* Skip backslash-newline sequence: it should be treated
* just like white space.
*/
if ((src + 2) == parsePtr->end) {
parsePtr->incomplete = 1;
}
src += 2;
continue;
}
if (*src != '#') {
break;
}
if (parsePtr->commentStart == NULL) {
parsePtr->commentStart = src;
}
while (1) {
if (src == parsePtr->end) {
if (nested) {
parsePtr->incomplete = nested;
}
parsePtr->commentSize = src - parsePtr->commentStart;
break;
} else if (*src == '\\') {
if ((src[1] == '\n') && ((src + 2) == parsePtr->end)) {
parsePtr->incomplete = 1;
}
Tcl_UtfBackslash(src, &length, utfBytes);
src += length;
} else if (*src == '\n') {
src++;
parsePtr->commentSize = src - parsePtr->commentStart;
break;
} else {
src++;
}
}
}
/*
* The following loop parses the words of the command, one word
* in each iteration through the loop.
*/
parsePtr->commandStart = src;
while (1) {
/*
* Create the token for the word.
*/
if (parsePtr->numTokens == parsePtr->tokensAvailable) {
TclExpandTokenArray(parsePtr);
}
wordIndex = parsePtr->numTokens;
tokenPtr = &parsePtr->tokenPtr[wordIndex];
tokenPtr->type = TCL_TOKEN_WORD;
/*
* Skip white space before the word. Also skip a backslash-newline
* sequence: it should be treated just like white space.
*/
while (1) {
type = CHAR_TYPE(*src);
if (type == TYPE_SPACE) {
src++;
continue;
} else if ((*src == '\\') && (src[1] == '\n')) {
if ((src + 2) == parsePtr->end) {
parsePtr->incomplete = 1;
}
Tcl_UtfBackslash(src, &length, utfBytes);
src += length;
continue;
}
break;
}
if ((type & terminators) != 0) {
src++;
break;
}
if (src == parsePtr->end) {
break;
}
tokenPtr->start = src;
parsePtr->numTokens++;
parsePtr->numWords++;
/*
* At this point the word can have one of three forms: something
* enclosed in quotes, something enclosed in braces, or an
* unquoted word (anything else).
*/
if (*src == '"') {
if (Tcl_ParseQuotedString(interp, src, (parsePtr->end - src),
parsePtr, 1, &termPtr) != TCL_OK) {
goto error;
}
src = termPtr;
} else if (*src == '{') {
if (Tcl_ParseBraces(interp, src, (parsePtr->end - src),
parsePtr, 1, &termPtr) != TCL_OK) {
goto error;
}
src = termPtr;
} else {
/*
* This is an unquoted word. Call ParseTokens and let it do
* all of the work.
*/
if (ParseTokens(src, TYPE_SPACE|terminators,
parsePtr) != TCL_OK) {
goto error;
}
src = parsePtr->term;
}
/*
* 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 ((tokenPtr->numComponents == 1)
&& (tokenPtr[1].type == TCL_TOKEN_TEXT)) {
tokenPtr->type = TCL_TOKEN_SIMPLE_WORD;
}
/*
* Do two additional checks: (a) make sure we're really at the
* end of a word (there might have been garbage left after a
* quoted or braced word), and (b) check for the end of the
* command.
*/
type = CHAR_TYPE(*src);
if (type == TYPE_SPACE) {
src++;
continue;
} else {
/*
* Backslash-newline (and any following white space) must be
* treated as if it were a space character.
*/
if ((*src == '\\') && (src[1] == '\n')) {
if ((src + 2) == parsePtr->end) {
parsePtr->incomplete = 1;
}
Tcl_UtfBackslash(src, &length, utfBytes);
src += length;
continue;
}
}
if ((type & terminators) != 0) {
src++;
break;
}
if (src == parsePtr->end) {
break;
}
if (interp != NULL) {
if (src[-1] == '"') {
Tcl_SetResult(interp, "extra characters after close-quote",
TCL_STATIC);
} else {
Tcl_SetResult(interp, "extra characters after close-brace",
TCL_STATIC);
}
}
parsePtr->term = src;
goto error;
}
parsePtr->commandSize = src - parsePtr->commandStart;
string[numBytes] = (char) savedChar;
return TCL_OK;
error:
string[numBytes] = (char) savedChar;
if (parsePtr->tokenPtr != parsePtr->staticTokens) {
ckfree((char *) parsePtr->tokenPtr);
}
if (parsePtr->commandStart == NULL) {
parsePtr->commandStart = string;
}
parsePtr->commandSize = parsePtr->term - parsePtr->commandStart;
return TCL_ERROR;
}
/*
*----------------------------------------------------------------------
*
* ParseTokens --
*
* This procedure 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 procedure is used to parse
* unquoted command words (those not in quotes or braces), words in
* quotes, and array indices for variables.
*
* 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 isn't NULL, then an error
* message is left in the interpreter's result.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
static int
ParseTokens(src, mask, parsePtr)
register char *src; /* First character to parse. */
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. */
Tcl_Parse *parsePtr; /* Information about parse in progress.
* Updated with additional tokens and
* termination information. */
{
int type, originalTokens, varToken;
char utfBytes[TCL_UTF_MAX];
Tcl_Token *tokenPtr;
Tcl_Parse nested;
/*
* 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 (1) {
if (parsePtr->numTokens == parsePtr->tokensAvailable) {
TclExpandTokenArray(parsePtr);
}
tokenPtr = &parsePtr->tokenPtr[parsePtr->numTokens];
tokenPtr->start = src;
tokenPtr->numComponents = 0;
type = CHAR_TYPE(*src);
if (type & mask) {
break;
}
if ((type & TYPE_SUBS) == 0) {
/*
* This is a simple range of characters. Scan to find the end
* of the range.
*/
while (1) {
src++;
if (CHAR_TYPE(*src) & (mask | TYPE_SUBS)) {
break;
}
}
tokenPtr->type = TCL_TOKEN_TEXT;
tokenPtr->size = src - tokenPtr->start;
parsePtr->numTokens++;
} else if (*src == '$') {
/*
* 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, parsePtr->end - src,
parsePtr, 1) != TCL_OK) {
return TCL_ERROR;
}
src += parsePtr->tokenPtr[varToken].size;
} else if (*src == '[') {
/*
* Command substitution. Call Tcl_ParseCommand recursively
* (and repeatedly) to parse the nested command(s), then
* throw away the parse information.
*/
src++;
while (1) {
if (Tcl_ParseCommand(parsePtr->interp, src,
parsePtr->end - src, 1, &nested) != TCL_OK) {
parsePtr->term = nested.term;
parsePtr->incomplete = nested.incomplete;
return TCL_ERROR;
}
src = nested.commandStart + nested.commandSize;
if (nested.tokenPtr != nested.staticTokens) {
ckfree((char *) nested.tokenPtr);
}
if ((src[-1] == ']') && !nested.incomplete) {
break;
}
if (src == parsePtr->end) {
if (parsePtr->interp != NULL) {
Tcl_SetResult(parsePtr->interp,
"missing close-bracket", TCL_STATIC);
}
parsePtr->term = tokenPtr->start;
parsePtr->incomplete = 1;
return TCL_ERROR;
}
}
tokenPtr->type = TCL_TOKEN_COMMAND;
tokenPtr->size = src - tokenPtr->start;
parsePtr->numTokens++;
} else if (*src == '\\') {
/*
* Backslash substitution.
*/
if (src[1] == '\n') {
if ((src + 2) == parsePtr->end) {
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) {
break;
}
}
tokenPtr->type = TCL_TOKEN_BS;
Tcl_UtfBackslash(src, &tokenPtr->size, utfBytes);
parsePtr->numTokens++;
src += tokenPtr->size;
} else if (*src == 0) {
/*
* We encountered a null character. If it is the null
* character at the end of the string, then return.
* Otherwise generate a text token for the single
* character.
*/
if (src == parsePtr->end) {
break;
}
tokenPtr->type = TCL_TOKEN_TEXT;
tokenPtr->size = 1;
parsePtr->numTokens++;
src++;
} else {
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.
*/
tokenPtr->type = TCL_TOKEN_TEXT;
tokenPtr->size = 0;
parsePtr->numTokens++;
}
parsePtr->term = src;
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* Tcl_FreeParse --
*
* This procedure 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(parsePtr)
Tcl_Parse *parsePtr; /* Structure that was filled in by a
* previous call to Tcl_ParseCommand. */
{
if (parsePtr->tokenPtr != parsePtr->staticTokens) {
ckfree((char *) parsePtr->tokenPtr);
}
}
/*
*----------------------------------------------------------------------
*
* TclExpandTokenArray --
*
* This procedure is invoked when the current space for tokens in
* a Tcl_Parse structure fills up; it allocates memory to grow the
* token array
*
* Results:
* None.
*
* Side effects:
* Memory is allocated for a new larger token array; the memory
* for the old array is freed, if it had been dynamically allocated.
*
*----------------------------------------------------------------------
*/
void
TclExpandTokenArray(parsePtr)
Tcl_Parse *parsePtr; /* Parse structure whose token space
* has overflowed. */
{
int newCount;
Tcl_Token *newPtr;
newCount = parsePtr->tokensAvailable*2;
newPtr = (Tcl_Token *) ckalloc((unsigned) (newCount * sizeof(Tcl_Token)));
memcpy((VOID *) newPtr, (VOID *) parsePtr->tokenPtr,
(size_t) (parsePtr->tokensAvailable * sizeof(Tcl_Token)));
if (parsePtr->tokenPtr != parsePtr->staticTokens) {
ckfree((char *) parsePtr->tokenPtr);
}
parsePtr->tokenPtr = newPtr;
parsePtr->tokensAvailable = newCount;
}
/*
*----------------------------------------------------------------------
*
* EvalObjv --
*
* This procedure evaluates a Tcl command that has already been
* parsed into words, with one Tcl_Obj holding each word.
*
* Results:
* The return value is a standard Tcl completion code such as
* TCL_OK or TCL_ERROR. A result or error message is left in
* interp's result. If an error occurs, this procedure does
* NOT add any information to the errorInfo variable.
*
* Side effects:
* Depends on the command.
*
*----------------------------------------------------------------------
*/
static int
EvalObjv(interp, objc, objv, command, length, flags)
Tcl_Interp *interp; /* Interpreter in which to evaluate the
* command. Also used for error
* reporting. */
int objc; /* Number of words in command. */
Tcl_Obj *CONST objv[]; /* An array of pointers to objects that are
* the words that make up the command. */
char *command; /* Points to the beginning of the string
* representation of the command; this
* is used for traces. If the string
* representation of the command is
* unknown, an empty string should be
* supplied. */
int length; /* Number of bytes in command; if -1, all
* characters up to the first null byte are
* used. */
int flags; /* Collection of OR-ed bits that control
* the evaluation of the script. Only
* TCL_EVAL_GLOBAL is currently
* supported. */
{
Command *cmdPtr;
Interp *iPtr = (Interp *) interp;
Tcl_Obj **newObjv;
int i, code;
Trace *tracePtr, *nextPtr;
char **argv, *commandCopy;
CallFrame *savedVarFramePtr; /* Saves old copy of iPtr->varFramePtr
* in case TCL_EVAL_GLOBAL was set. */
Tcl_ResetResult(interp);
if (objc == 0) {
return TCL_OK;
}
/*
* If the interpreter was deleted, return an error.
*/
if (iPtr->flags & DELETED) {
Tcl_AppendToObj(Tcl_GetObjResult(interp),
"attempt to call eval in deleted interpreter", -1);
Tcl_SetErrorCode(interp, "CORE", "IDELETE",
"attempt to call eval in deleted interpreter",
(char *) NULL);
return TCL_ERROR;
}
/*
* Check depth of nested calls to Tcl_Eval: if this gets too large,
* it's probably because of an infinite loop somewhere.
*/
if (iPtr->numLevels >= iPtr->maxNestingDepth) {
iPtr->result = "too many nested calls to Tcl_Eval (infinite loop?)";
return TCL_ERROR;
}
iPtr->numLevels++;
/*
* On the Mac, we will never reach the default recursion limit before
* blowing the stack. So we need to do a check here.
*/
if (TclpCheckStackSpace() == 0) {
/*NOTREACHED*/
iPtr->numLevels--;
iPtr->result = "too many nested calls to Tcl_Eval (infinite loop?)";
return TCL_ERROR;
}
/*
* Find the procedure to execute this command. If there isn't one,
* then see if there is a command "unknown". If so, create a new
* word array with "unknown" as the first word and the original
* command words as arguments. Then call ourselves recursively
* to execute it.
*/
cmdPtr = (Command *) Tcl_GetCommandFromObj(interp, objv[0]);
if (cmdPtr == NULL) {
newObjv = (Tcl_Obj **) ckalloc((unsigned)
((objc + 1) * sizeof (Tcl_Obj *)));
for (i = objc-1; i >= 0; i--) {
newObjv[i+1] = objv[i];
}
newObjv[0] = Tcl_NewStringObj("unknown", -1);
Tcl_IncrRefCount(newObjv[0]);
cmdPtr = (Command *) Tcl_GetCommandFromObj(interp, newObjv[0]);
if (cmdPtr == NULL) {
Tcl_AppendStringsToObj(Tcl_GetObjResult(interp),
"invalid command name \"", Tcl_GetString(objv[0]), "\"",
(char *) NULL);
code = TCL_ERROR;
} else {
code = EvalObjv(interp, objc+1, newObjv, command, length, 0);
}
Tcl_DecrRefCount(newObjv[0]);
ckfree((char *) newObjv);
goto done;
}
/*
* Call trace procedures if needed.
*/
argv = NULL;
commandCopy = command;
for (tracePtr = iPtr->tracePtr; tracePtr != NULL; tracePtr = nextPtr) {
nextPtr = tracePtr->nextPtr;
if (iPtr->numLevels > tracePtr->level) {
continue;
}
/*
* This is a bit messy because we have to emulate the old trace
* interface, which uses strings for everything.
*/
if (argv == NULL) {
argv = (char **) ckalloc((unsigned) (objc + 1) * sizeof(char *));
for (i = 0; i < objc; i++) {
argv[i] = Tcl_GetString(objv[i]);
}
argv[objc] = 0;
if (length < 0) {
length = strlen(command);
} else if ((size_t)length < strlen(command)) {
commandCopy = (char *) ckalloc((unsigned) (length + 1));
strncpy(commandCopy, command, (size_t) length);
commandCopy[length] = 0;
}
}
(*tracePtr->proc)(tracePtr->clientData, interp, iPtr->numLevels,
commandCopy, cmdPtr->proc, cmdPtr->clientData,
objc, argv);
}
if (argv != NULL) {
ckfree((char *) argv);
}
if (commandCopy != command) {
ckfree((char *) commandCopy);
}
/*
* Finally, invoke the command's Tcl_ObjCmdProc.
*/
iPtr->cmdCount++;
savedVarFramePtr = iPtr->varFramePtr;
if (flags & TCL_EVAL_GLOBAL) {
iPtr->varFramePtr = NULL;
}
code = (*cmdPtr->objProc)(cmdPtr->objClientData, interp, objc, objv);
iPtr->varFramePtr = savedVarFramePtr;
if (Tcl_AsyncReady()) {
code = Tcl_AsyncInvoke(interp, code);
}
/*
* If the interpreter has a non-empty string result, the result
* object is either empty or stale because some procedure set
* interp->result directly. If so, move the string result to the
* result object, then reset the string result.
*/
if (*(iPtr->result) != 0) {
(void) Tcl_GetObjResult(interp);
}
done:
iPtr->numLevels--;
return code;
}
/*
*----------------------------------------------------------------------
*
* Tcl_EvalObjv --
*
* This procedure evaluates a Tcl command that has already been
* parsed into words, with one Tcl_Obj holding each word.
*
* Results:
* The return value is a standard Tcl completion code such as
* TCL_OK or TCL_ERROR. A result or error message is left in
* interp's result.
*
* Side effects:
* Depends on the command.
*
*----------------------------------------------------------------------
*/
int
Tcl_EvalObjv(interp, objc, objv, flags)
Tcl_Interp *interp; /* Interpreter in which to evaluate the
* command. Also used for error
* reporting. */
int objc; /* Number of words in command. */
Tcl_Obj *CONST objv[]; /* An array of pointers to objects that are
* the words that make up the command. */
int flags; /* Collection of OR-ed bits that control
* the evaluation of the script. Only
* TCL_EVAL_GLOBAL is currently
* supported. */
{
Interp *iPtr = (Interp *)interp;
Trace *tracePtr;
Tcl_DString cmdBuf;
char *cmdString = "";
int cmdLen = 0;
int code = TCL_OK;
for (tracePtr = iPtr->tracePtr; tracePtr; tracePtr = tracePtr->nextPtr) {
/*
* EvalObjv will increment numLevels so use "<" rather than "<="
*/
if (iPtr->numLevels < tracePtr->level) {
int i;
/*
* The command will be needed for an execution trace or stack trace
* generate a command string.
*/
cmdtraced:
Tcl_DStringInit(&cmdBuf);
for (i = 0; i < objc; i++) {
Tcl_DStringAppendElement(&cmdBuf, Tcl_GetString(objv[i]));
}
cmdString = Tcl_DStringValue(&cmdBuf);
cmdLen = Tcl_DStringLength(&cmdBuf);
break;
}
}
/*
* Execute the command if we have not done so already
*/
switch (code) {
case TCL_OK:
code = EvalObjv(interp, objc, objv, cmdString, cmdLen, flags);
if (code == TCL_ERROR && cmdLen == 0)
goto cmdtraced;
break;
case TCL_ERROR:
Tcl_LogCommandInfo(interp, cmdString, cmdString, cmdLen);
break;
default:
/*NOTREACHED*/
break;
}
if (cmdLen != 0) {
Tcl_DStringFree(&cmdBuf);
}
return code;
}
/*
*----------------------------------------------------------------------
*
* Tcl_LogCommandInfo --
*
* This procedure is invoked after an error occurs in an interpreter.
* It adds information to the "errorInfo" variable to describe the
* command that was being executed when the error occurred.
*
* Results:
* None.
*
* Side effects:
* Information about the command is added to errorInfo and the
* line number stored internally in the interpreter is set. If this
* is the first call to this procedure or Tcl_AddObjErrorInfo since
* an error occurred, then old information in errorInfo is
* deleted.
*
*----------------------------------------------------------------------
*/
void
Tcl_LogCommandInfo(interp, script, command, length)
Tcl_Interp *interp; /* Interpreter in which to log information. */
char *script; /* First character in script containing
* command (must be <= command). */
char *command; /* First character in command that
* generated the error. */
int length; /* Number of bytes in command (-1 means
* use all bytes up to first null byte). */
{
char buffer[200];
register char *p;
char *ellipsis = "";
Interp *iPtr = (Interp *) interp;
if (iPtr->flags & ERR_ALREADY_LOGGED) {
/*
* Someone else has already logged error information for this
* command; we shouldn't add anything more.
*/
return;
}
/*
* Compute the line number where the error occurred.
*/
iPtr->errorLine = 1;
for (p = script; p != command; p++) {
if (*p == '\n') {
iPtr->errorLine++;
}
}
/*
* Create an error message to add to errorInfo, including up to a
* maximum number of characters of the command.
*/
if (length < 0) {
length = strlen(command);
}
if (length > 150) {
length = 150;
ellipsis = "...";
}
if (!(iPtr->flags & ERR_IN_PROGRESS)) {
sprintf(buffer, "\n while executing\n\"%.*s%s\"",
length, command, ellipsis);
} else {
sprintf(buffer, "\n invoked from within\n\"%.*s%s\"",
length, command, ellipsis);
}
Tcl_AddObjErrorInfo(interp, buffer, -1);
iPtr->flags &= ~ERR_ALREADY_LOGGED;
}
/*
*----------------------------------------------------------------------
*
* Tcl_EvalTokens --
*
* Given an array of tokens parsed from a Tcl command (e.g., the
* tokens that make up a word or the index for an array variable)
* this procedure evaluates the tokens and concatenates their
* values to form a single result value.
*
* Results:
* The return value is a pointer to a newly allocated Tcl_Obj
* containing the value of the array of tokens. The reference
* count of the returned object has been incremented. If an error
* occurs in evaluating the tokens then a NULL value is returned
* and an error message is left in interp's result.
*
* Side effects:
* A new object is allocated to hold the result.
*
*----------------------------------------------------------------------
*/
Tcl_Obj *
Tcl_EvalTokens(interp, tokenPtr, count)
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. */
{
Tcl_Obj *resultPtr, *indexPtr, *valuePtr, *newPtr;
char buffer[TCL_UTF_MAX];
#ifdef TCL_MEM_DEBUG
# define MAX_VAR_CHARS 5
#else
# define MAX_VAR_CHARS 30
#endif
char nameBuffer[MAX_VAR_CHARS+1];
char *varName, *index;
char *p = NULL; /* Initialized to avoid compiler warning. */
int length, code;
/*
* The only tricky thing about this procedure is that it attempts to
* avoid object creation and string copying whenever possible. For
* example, if the value is just a nested command, then use the
* command's result object directly.
*/
resultPtr = NULL;
for ( ; count > 0; count--, tokenPtr++) {
valuePtr = NULL;
/*
* The switch statement below computes the next value to be
* concat to the result, as either a range of text or an
* object.
*/
switch (tokenPtr->type) {
case TCL_TOKEN_TEXT:
p = tokenPtr->start;
length = tokenPtr->size;
break;
case TCL_TOKEN_BS:
length = Tcl_UtfBackslash(tokenPtr->start, (int *) NULL,
buffer);
p = buffer;
break;
case TCL_TOKEN_COMMAND:
code = Tcl_EvalEx(interp, tokenPtr->start+1, tokenPtr->size-2,
0);
if (code != TCL_OK) {
goto error;
}
valuePtr = Tcl_GetObjResult(interp);
break;
case TCL_TOKEN_VARIABLE:
if (tokenPtr->numComponents == 1) {
indexPtr = NULL;
} else {
indexPtr = Tcl_EvalTokens(interp, tokenPtr+2,
tokenPtr->numComponents - 1);
if (indexPtr == NULL) {
goto error;
}
}
/*
* We have to make a copy of the variable name in order
* to have a null-terminated string. We can't make a
* temporary modification to the script to null-terminate
* the name, because a trace callback might potentially
* reuse the script and be affected by the null character.
*/
if (tokenPtr[1].size <= MAX_VAR_CHARS) {
varName = nameBuffer;
} else {
varName = ckalloc((unsigned) (tokenPtr[1].size + 1));
}
strncpy(varName, tokenPtr[1].start, (size_t) tokenPtr[1].size);
varName[tokenPtr[1].size] = 0;
if (indexPtr != NULL) {
index = TclGetString(indexPtr);
} else {
index = NULL;
}
valuePtr = Tcl_GetObjVar2(interp, varName, index,
TCL_LEAVE_ERR_MSG);
if (varName != nameBuffer) {
ckfree(varName);
}
if (indexPtr != NULL) {
Tcl_DecrRefCount(indexPtr);
}
if (valuePtr == NULL) {
goto error;
}
count -= tokenPtr->numComponents;
tokenPtr += tokenPtr->numComponents;
break;
default:
panic("unexpected token type in Tcl_EvalTokens");
}
/*
* If valuePtr isn't NULL, the next piece of text comes from that
* object; otherwise, take length bytes starting at p.
*/
if (resultPtr == NULL) {
if (valuePtr != NULL) {
resultPtr = valuePtr;
} else {
resultPtr = Tcl_NewStringObj(p, length);
}
Tcl_IncrRefCount(resultPtr);
} else {
if (Tcl_IsShared(resultPtr)) {
newPtr = Tcl_DuplicateObj(resultPtr);
Tcl_DecrRefCount(resultPtr);
resultPtr = newPtr;
Tcl_IncrRefCount(resultPtr);
}
if (valuePtr != NULL) {
p = Tcl_GetStringFromObj(valuePtr, &length);
}
Tcl_AppendToObj(resultPtr, p, length);
}
}
return resultPtr;
error:
if (resultPtr != NULL) {
Tcl_DecrRefCount(resultPtr);
}
return NULL;
}
/*
*----------------------------------------------------------------------
*
* Tcl_EvalEx --
*
* This procedure evaluates a Tcl script without using the compiler
* or byte-code interpreter. It just parses the script, creates
* values for each word of each command, then calls EvalObjv
* to execute each command.
*
* Results:
* The return value is a standard Tcl completion code such as
* TCL_OK or TCL_ERROR. A result or error message is left in
* interp's result.
*
* Side effects:
* Depends on the script.
*
*----------------------------------------------------------------------
*/
int
Tcl_EvalEx(interp, script, numBytes, flags)
Tcl_Interp *interp; /* Interpreter in which to evaluate the
* script. Also used for error reporting. */
char *script; /* First character of script to evaluate. */
int numBytes; /* Number of bytes in script. If < 0, the
* script consists of all bytes up to the
* first null character. */
int flags; /* Collection of OR-ed bits that control
* the evaluation of the script. Only
* TCL_EVAL_GLOBAL is currently
* supported. */
{
Interp *iPtr = (Interp *) interp;
char *p, *next;
Tcl_Parse parse;
#define NUM_STATIC_OBJS 20
Tcl_Obj *staticObjArray[NUM_STATIC_OBJS], **objv;
Tcl_Token *tokenPtr;
int i, code, commandLength, bytesLeft, nested;
CallFrame *savedVarFramePtr; /* Saves old copy of iPtr->varFramePtr
* in case TCL_EVAL_GLOBAL was set. */
/*
* The variables below keep track of how much state has been
* allocated while evaluating the script, so that it can be freed
* properly if an error occurs.
*/
int gotParse = 0, objectsUsed = 0;
if (numBytes < 0) {
numBytes = strlen(script);
}
Tcl_ResetResult(interp);
savedVarFramePtr = iPtr->varFramePtr;
if (flags & TCL_EVAL_GLOBAL) {
iPtr->varFramePtr = NULL;
}
/*
* Each iteration through the following loop parses the next
* command from the script and then executes it.
*/
objv = staticObjArray;
p = script;
bytesLeft = numBytes;
if (iPtr->evalFlags & TCL_BRACKET_TERM) {
nested = 1;
} else {
nested = 0;
}
iPtr->evalFlags = 0;
do {
if (Tcl_ParseCommand(interp, p, bytesLeft, nested, &parse)
!= TCL_OK) {
code = TCL_ERROR;
goto error;
}
gotParse = 1;
if (parse.numWords > 0) {
/*
* Generate an array of objects for the words of the command.
*/
if (parse.numWords <= NUM_STATIC_OBJS) {
objv = staticObjArray;
} else {
objv = (Tcl_Obj **) ckalloc((unsigned)
(parse.numWords * sizeof (Tcl_Obj *)));
}
for (objectsUsed = 0, tokenPtr = parse.tokenPtr;
objectsUsed < parse.numWords;
objectsUsed++, tokenPtr += (tokenPtr->numComponents + 1)) {
objv[objectsUsed] = Tcl_EvalTokens(interp, tokenPtr+1,
tokenPtr->numComponents);
if (objv[objectsUsed] == NULL) {
code = TCL_ERROR;
goto error;
}
}
/*
* Execute the command and free the objects for its words.
*/
code = EvalObjv(interp, objectsUsed, objv, p, bytesLeft, 0);
if (code != TCL_OK) {
goto error;
}
for (i = 0; i < objectsUsed; i++) {
Tcl_DecrRefCount(objv[i]);
}
objectsUsed = 0;
if (objv != staticObjArray) {
ckfree((char *) objv);
objv = staticObjArray;
}
}
/*
* Advance to the next command in the script.
*/
next = parse.commandStart + parse.commandSize;
bytesLeft -= next - p;
p = next;
Tcl_FreeParse(&parse);
gotParse = 0;
if ((nested != 0) && (p > script) && (p[-1] == ']')) {
/*
* We get here in the special case where the TCL_BRACKET_TERM
* flag was set in the interpreter and we reached a close
* bracket in the script. Return immediately.
*/
iPtr->termOffset = (p - 1) - script;
iPtr->varFramePtr = savedVarFramePtr;
return TCL_OK;
}
} while (bytesLeft > 0);
iPtr->termOffset = p - script;
iPtr->varFramePtr = savedVarFramePtr;
return TCL_OK;
error:
/*
* Generate various pieces of error information, such as the line
* number where the error occurred and information to add to the
* errorInfo variable. Then free resources that had been allocated
* to the command.
*/
if ((code == TCL_ERROR) && !(iPtr->flags & ERR_ALREADY_LOGGED)) {
commandLength = parse.commandSize;
if ((parse.commandStart + commandLength) != (script + numBytes)) {
/*
* The command where the error occurred didn't end at the end
* of the script (i.e. it ended at a terminator character such
* as ";". Reduce the length by one so that the error message
* doesn't include the terminator character.
*/
commandLength -= 1;
}
Tcl_LogCommandInfo(interp, script, parse.commandStart, commandLength);
}
for (i = 0; i < objectsUsed; i++) {
Tcl_DecrRefCount(objv[i]);
}
if (gotParse) {
Tcl_FreeParse(&parse);
}
if (objv != staticObjArray) {
ckfree((char *) objv);
}
iPtr->varFramePtr = savedVarFramePtr;
return code;
}
/*
*----------------------------------------------------------------------
*
* Tcl_Eval --
*
* Execute a Tcl command in a string. This procedure executes the
* script directly, rather than compiling it to bytecodes. Before
* the arrival of the bytecode compiler in Tcl 8.0 Tcl_Eval was
* the main procedure used for executing Tcl commands, but nowadays
* it isn't used much.
*
* Results:
* The return value is one of the return codes defined in tcl.h
* (such as TCL_OK), and interp's result contains a value
* to supplement the return code. The value of the result
* will persist only until the next call to Tcl_Eval or Tcl_EvalObj:
* you must copy it or lose it!
*
* Side effects:
* Can be almost arbitrary, depending on the commands in the script.
*
*----------------------------------------------------------------------
*/
int
Tcl_Eval(interp, string)
Tcl_Interp *interp; /* Token for command interpreter (returned
* by previous call to Tcl_CreateInterp). */
char *string; /* Pointer to TCL command to execute. */
{
int code;
code = Tcl_EvalEx(interp, string, -1, 0);
/*
* For backwards compatibility with old C code that predates the
* object system in Tcl 8.0, we have to mirror the object result
* back into the string result (some callers may expect it there).
*/
Tcl_SetResult(interp, TclGetString(Tcl_GetObjResult(interp)),
TCL_VOLATILE);
return code;
}
/*
*----------------------------------------------------------------------
*
* Tcl_ParseVarName --
*
* Given a string starting with a $ sign, parse off a variable
* name and return information about the parse.
*
* 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 procedure returns TCL_OK then the caller must
* eventually invoke Tcl_FreeParse to release any additional space
* that was allocated.
*
*----------------------------------------------------------------------
*/
int
Tcl_ParseVarName(interp, string, numBytes, parsePtr, append)
Tcl_Interp *interp; /* Interpreter to use for error reporting;
* if NULL, then no error message is
* provided. */
char *string; /* String containing variable name. First
* character must be "$". */
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;
char *end, *src;
unsigned char c;
int varIndex, offset;
Tcl_UniChar ch;
if (numBytes >= 0) {
end = string + numBytes;
} else {
end = string + strlen(string);
}
if (!append) {
parsePtr->numWords = 0;
parsePtr->tokenPtr = parsePtr->staticTokens;
parsePtr->numTokens = 0;
parsePtr->tokensAvailable = NUM_STATIC_TOKENS;
parsePtr->string = string;
parsePtr->end = end;
parsePtr->interp = interp;
parsePtr->incomplete = 0;
}
/*
* 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 = string;
if ((parsePtr->numTokens + 2) > parsePtr->tokensAvailable) {
TclExpandTokenArray(parsePtr);
}
tokenPtr = &parsePtr->tokenPtr[parsePtr->numTokens];
tokenPtr->type = TCL_TOKEN_VARIABLE;
tokenPtr->start = src;
varIndex = parsePtr->numTokens;
parsePtr->numTokens++;
tokenPtr++;
src++;
if (src >= end) {
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++;
tokenPtr->type = TCL_TOKEN_TEXT;
tokenPtr->start = src;
tokenPtr->numComponents = 0;
while (1) {
if (src == end) {
if (interp != NULL) {
Tcl_SetResult(interp,
"missing close-brace for variable name",
TCL_STATIC);
}
parsePtr->term = tokenPtr->start-1;
parsePtr->incomplete = 1;
goto error;
}
if (*src == '}') {
break;
}
src++;
}
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 (src != end) {
offset = Tcl_UtfToUniChar(src, &ch);
c = UCHAR(ch);
if (isalnum(c) || (c == '_')) { /* INTL: ISO only. */
src += offset;
continue;
}
if ((c == ':') && (((src+1) != end) && (src[1] == ':'))) {
src += 2;
while ((src != end) && (*src == ':')) {
src += 1;
}
continue;
}
break;
}
tokenPtr->size = src - tokenPtr->start;
if (tokenPtr->size == 0) {
goto justADollarSign;
}
parsePtr->numTokens++;
if ((src != end) && (*src == '(')) {
/*
* 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 (ParseTokens(src+1, TYPE_CLOSE_PAREN, parsePtr)
!= TCL_OK) {
goto error;
}
if ((parsePtr->term == end) || (*parsePtr->term != ')')) {
if (parsePtr->interp != NULL) {
Tcl_SetResult(parsePtr->interp, "missing )",
TCL_STATIC);
}
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:
if (parsePtr->tokenPtr != parsePtr->staticTokens) {
ckfree((char *) parsePtr->tokenPtr);
}
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.
*
*----------------------------------------------------------------------
*/
char *
Tcl_ParseVar(interp, string, termPtr)
Tcl_Interp *interp; /* Context for looking up variable. */
register char *string; /* String containing variable name.
* First character must be "$". */
char **termPtr; /* If non-NULL, points to word to fill
* in with character just after last
* one in the variable specifier. */
{
Tcl_Parse parse;
register Tcl_Obj *objPtr;
if (Tcl_ParseVarName(interp, string, -1, &parse, 0) != TCL_OK) {
return NULL;
}
if (termPtr != NULL) {
*termPtr = string + parse.tokenPtr->size;
}
if (parse.numTokens == 1) {
/*
* There isn't a variable name after all: the $ is just a $.
*/
return "$";
}
objPtr = Tcl_EvalTokens(interp, parse.tokenPtr, parse.numTokens);
if (objPtr == NULL) {
return NULL;
}
/*
* At this point we should have an object containing the value of
* a variable. Just return the string from that object.
*/
#ifdef TCL_COMPILE_DEBUG
if (objPtr->refCount < 2) {
panic("Tcl_ParseVar got temporary object from Tcl_EvalTokens");
}
#endif /*TCL_COMPILE_DEBUG*/
TclDecrRefCount(objPtr);
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 procedure parses the string and
* returns information about the parse.
*
* 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 procedure returns TCL_OK then the caller must
* eventually invoke Tcl_FreeParse to release any additional space
* that was allocated.
*
*----------------------------------------------------------------------
*/
int
Tcl_ParseBraces(interp, string, numBytes, parsePtr, append, termPtr)
Tcl_Interp *interp; /* Interpreter to use for error reporting;
* if NULL, then no error message is
* provided. */
char *string; /* String containing the string in braces.
* The first character must be '{'. */
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. */
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. */
{
char utfBytes[TCL_UTF_MAX]; /* For result of backslash substitution. */
Tcl_Token *tokenPtr;
register char *src, *end;
int startIndex, level, length;
if ((numBytes >= 0) || (string == NULL)) {
end = string + numBytes;
} else {
end = string + strlen(string);
}
if (!append) {
parsePtr->numWords = 0;
parsePtr->tokenPtr = parsePtr->staticTokens;
parsePtr->numTokens = 0;
parsePtr->tokensAvailable = NUM_STATIC_TOKENS;
parsePtr->string = string;
parsePtr->end = end;
parsePtr->interp = interp;
}
src = string+1;
startIndex = parsePtr->numTokens;
if (parsePtr->numTokens == parsePtr->tokensAvailable) {
TclExpandTokenArray(parsePtr);
}
tokenPtr = &parsePtr->tokenPtr[startIndex];
tokenPtr->type = TCL_TOKEN_TEXT;
tokenPtr->start = src;
tokenPtr->numComponents = 0;
level = 1;
while (1) {
while (CHAR_TYPE(*src) == TYPE_NORMAL) {
src++;
}
if (*src == '}') {
level--;
if (level == 0) {
break;
}
src++;
} else if (*src == '{') {
level++;
src++;
} else if (*src == '\\') {
Tcl_UtfBackslash(src, &length, utfBytes);
if (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 ((src + 2) == end) {
parsePtr->incomplete = 1;
}
tokenPtr->size = (src - tokenPtr->start);
if (tokenPtr->size != 0) {
parsePtr->numTokens++;
}
if ((parsePtr->numTokens+1) >= parsePtr->tokensAvailable) {
TclExpandTokenArray(parsePtr);
}
tokenPtr = &parsePtr->tokenPtr[parsePtr->numTokens];
tokenPtr->type = TCL_TOKEN_BS;
tokenPtr->start = src;
tokenPtr->size = length;
tokenPtr->numComponents = 0;
parsePtr->numTokens++;
src += length;
tokenPtr++;
tokenPtr->type = TCL_TOKEN_TEXT;
tokenPtr->start = src;
tokenPtr->numComponents = 0;
} else {
src += length;
}
} else if (src == end) {
if (interp != NULL) {
Tcl_SetResult(interp, "missing close-brace", TCL_STATIC);
}
parsePtr->term = string;
parsePtr->incomplete = 1;
goto error;
} else {
src++;
}
}
/*
* 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;
error:
if (parsePtr->tokenPtr != parsePtr->staticTokens) {
ckfree((char *) parsePtr->tokenPtr);
}
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 procedure parses the
* string and returns information about the parse.
*
* 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 procedure returns TCL_OK then the caller must
* eventually invoke Tcl_FreeParse to release any additional space
* that was allocated.
*
*----------------------------------------------------------------------
*/
int
Tcl_ParseQuotedString(interp, string, numBytes, parsePtr, append, termPtr)
Tcl_Interp *interp; /* Interpreter to use for error reporting;
* if NULL, then no error message is
* provided. */
char *string; /* String containing the quoted string.
* The first character must be '"'. */
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. */
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. */
{
char *end;
if ((numBytes >= 0) || (string == NULL)) {
end = string + numBytes;
} else {
end = string + strlen(string);
}
if (!append) {
parsePtr->numWords = 0;
parsePtr->tokenPtr = parsePtr->staticTokens;
parsePtr->numTokens = 0;
parsePtr->tokensAvailable = NUM_STATIC_TOKENS;
parsePtr->string = string;
parsePtr->end = end;
parsePtr->interp = interp;
}
if (ParseTokens(string+1, TYPE_QUOTE, parsePtr) != TCL_OK) {
goto error;
}
if (*parsePtr->term != '"') {
if (interp != NULL) {
Tcl_SetResult(parsePtr->interp, "missing \"", TCL_STATIC);
}
parsePtr->term = string;
parsePtr->incomplete = 1;
goto error;
}
if (termPtr != NULL) {
*termPtr = (parsePtr->term + 1);
}
return TCL_OK;
error:
if (parsePtr->tokenPtr != parsePtr->staticTokens) {
ckfree((char *) parsePtr->tokenPtr);
}
return TCL_ERROR;
}
/*
*----------------------------------------------------------------------
*
* CommandComplete --
*
* This procedure is shared by Tcl_CommandComplete 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 int
CommandComplete(script, length)
char *script; /* Script to check. */
int length; /* Number of bytes in script. */
{
Tcl_Parse parse;
char *p, *end;
p = script;
end = p + length;
while (Tcl_ParseCommand((Tcl_Interp *) NULL, p, end - p, 0, &parse)
== TCL_OK) {
p = parse.commandStart + parse.commandSize;
if (*p == 0) {
break;
}
}
if (parse.incomplete) {
return 0;
}
return 1;
}
/*
*----------------------------------------------------------------------
*
* Tcl_CommandComplete --
*
* Given a partial or complete Tcl script, this procedure
* 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(script)
char *script; /* Script to check. */
{
return CommandComplete(script, (int) strlen(script));
}
/*
*----------------------------------------------------------------------
*
* TclObjCommandComplete --
*
* Given a partial or complete Tcl command in a Tcl object, this
* procedure 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(objPtr)
Tcl_Obj *objPtr; /* Points to object holding script
* to check. */
{
char *script;
int length;
script = Tcl_GetStringFromObj(objPtr, &length);
return CommandComplete(script, length);
}
/*
*----------------------------------------------------------------------
*
* TclIsLocalScalar --
*
* Check to see if a given string is a legal scalar variable
* name with no namespace qualifiers or substitutions.
*
* Results:
* Returns 1 if the variable is a local scalar.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
int
TclIsLocalScalar(src, len)
CONST char *src;
int len;
{
CONST char *p;
CONST char *lastChar = src + (len - 1);
for (p = src; p <= lastChar; p++) {
if ((CHAR_TYPE(*p) != TYPE_NORMAL) &&
(CHAR_TYPE(*p) != TYPE_COMMAND_END)) {
/*
* TCL_COMMAND_END is returned for the last character
* of the string. By this point we know it isn't
* an array or namespace reference.
*/
return 0;
}
if (*p == '(') {
if (*lastChar == ')') { /* we have an array element */
return 0;
}
} else if (*p == ':') {
if ((p != lastChar) && *(p+1) == ':') { /* qualified name */
return 0;
}
}
}
return 1;
}
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