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RetroZilla/js/src/jsregexp.c

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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* vim: set sw=4 ts=8 et tw=78:
*
* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Mozilla Communicator client code, released
* March 31, 1998.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
/*
* JS regular expressions, after Perl.
*/
#include "jsstddef.h"
#include <stdlib.h>
#include <string.h>
#include "jstypes.h"
#include "jsarena.h" /* Added by JSIFY */
#include "jsutil.h" /* Added by JSIFY */
#include "jsapi.h"
#include "jsarray.h"
#include "jsatom.h"
#include "jscntxt.h"
#include "jsconfig.h"
#include "jsfun.h"
#include "jsgc.h"
#include "jsinterp.h"
#include "jslock.h"
#include "jsnum.h"
#include "jsobj.h"
#include "jsopcode.h"
#include "jsregexp.h"
#include "jsscan.h"
#include "jsstr.h"
/* Note : contiguity of 'simple opcodes' is important for SimpleMatch() */
typedef enum REOp {
REOP_EMPTY = 0, /* match rest of input against rest of r.e. */
REOP_ALT = 1, /* alternative subexpressions in kid and next */
REOP_SIMPLE_START = 2, /* start of 'simple opcodes' */
REOP_BOL = 2, /* beginning of input (or line if multiline) */
REOP_EOL = 3, /* end of input (or line if multiline) */
REOP_WBDRY = 4, /* match "" at word boundary */
REOP_WNONBDRY = 5, /* match "" at word non-boundary */
REOP_DOT = 6, /* stands for any character */
REOP_DIGIT = 7, /* match a digit char: [0-9] */
REOP_NONDIGIT = 8, /* match a non-digit char: [^0-9] */
REOP_ALNUM = 9, /* match an alphanumeric char: [0-9a-z_A-Z] */
REOP_NONALNUM = 10, /* match a non-alphanumeric char: [^0-9a-z_A-Z] */
REOP_SPACE = 11, /* match a whitespace char */
REOP_NONSPACE = 12, /* match a non-whitespace char */
REOP_BACKREF = 13, /* back-reference (e.g., \1) to a parenthetical */
REOP_FLAT = 14, /* match a flat string */
REOP_FLAT1 = 15, /* match a single char */
REOP_FLATi = 16, /* case-independent REOP_FLAT */
REOP_FLAT1i = 17, /* case-independent REOP_FLAT1 */
REOP_UCFLAT1 = 18, /* single Unicode char */
REOP_UCFLAT1i = 19, /* case-independent REOP_UCFLAT1 */
REOP_UCFLAT = 20, /* flat Unicode string; len immediate counts chars */
REOP_UCFLATi = 21, /* case-independent REOP_UCFLAT */
REOP_CLASS = 22, /* character class with index */
REOP_NCLASS = 23, /* negated character class with index */
REOP_SIMPLE_END = 23, /* end of 'simple opcodes' */
REOP_QUANT = 25, /* quantified atom: atom{1,2} */
REOP_STAR = 26, /* zero or more occurrences of kid */
REOP_PLUS = 27, /* one or more occurrences of kid */
REOP_OPT = 28, /* optional subexpression in kid */
REOP_LPAREN = 29, /* left paren bytecode: kid is u.num'th sub-regexp */
REOP_RPAREN = 30, /* right paren bytecode */
REOP_JUMP = 31, /* for deoptimized closure loops */
REOP_DOTSTAR = 32, /* optimize .* to use a single opcode */
REOP_ANCHOR = 33, /* like .* but skips left context to unanchored r.e. */
REOP_EOLONLY = 34, /* $ not preceded by any pattern */
REOP_BACKREFi = 37, /* case-independent REOP_BACKREF */
REOP_LPARENNON = 41, /* non-capturing version of REOP_LPAREN */
REOP_ASSERT = 43, /* zero width positive lookahead assertion */
REOP_ASSERT_NOT = 44, /* zero width negative lookahead assertion */
REOP_ASSERTTEST = 45, /* sentinel at end of assertion child */
REOP_ASSERTNOTTEST = 46, /* sentinel at end of !assertion child */
REOP_MINIMALSTAR = 47, /* non-greedy version of * */
REOP_MINIMALPLUS = 48, /* non-greedy version of + */
REOP_MINIMALOPT = 49, /* non-greedy version of ? */
REOP_MINIMALQUANT = 50, /* non-greedy version of {} */
REOP_ENDCHILD = 51, /* sentinel at end of quantifier child */
REOP_REPEAT = 52, /* directs execution of greedy quantifier */
REOP_MINIMALREPEAT = 53, /* directs execution of non-greedy quantifier */
REOP_ALTPREREQ = 54, /* prerequisite for ALT, either of two chars */
REOP_ALTPREREQ2 = 55, /* prerequisite for ALT, a char or a class */
REOP_ENDALT = 56, /* end of final alternate */
REOP_CONCAT = 57, /* concatenation of terms (parse time only) */
REOP_END
} REOp;
#define REOP_IS_SIMPLE(op) ((unsigned)((op) - REOP_SIMPLE_START) < \
(unsigned)REOP_SIMPLE_END)
struct RENode {
REOp op; /* r.e. op bytecode */
RENode *next; /* next in concatenation order */
void *kid; /* first operand */
union {
void *kid2; /* second operand */
jsint num; /* could be a number */
size_t parenIndex; /* or a parenthesis index */
struct { /* or a quantifier range */
uintN min;
uintN max;
JSPackedBool greedy;
} range;
struct { /* or a character class */
size_t startIndex;
size_t kidlen; /* length of string at kid, in jschars */
size_t index; /* index into class list */
uint16 bmsize; /* bitmap size, based on max char code */
JSPackedBool sense;
} ucclass;
struct { /* or a literal sequence */
jschar chr; /* of one character */
size_t length; /* or many (via the kid) */
} flat;
struct {
RENode *kid2; /* second operand from ALT */
jschar ch1; /* match char for ALTPREREQ */
jschar ch2; /* ditto, or class index for ALTPREREQ2 */
} altprereq;
} u;
};
#define RE_IS_LETTER(c) (((c >= 'A') && (c <= 'Z')) || \
((c >= 'a') && (c <= 'z')) )
#define RE_IS_LINE_TERM(c) ((c == '\n') || (c == '\r') || \
(c == LINE_SEPARATOR) || (c == PARA_SEPARATOR))
#define CLASS_CACHE_SIZE 4
typedef struct CompilerState {
JSContext *context;
JSTokenStream *tokenStream; /* For reporting errors */
const jschar *cpbegin;
const jschar *cpend;
const jschar *cp;
size_t parenCount;
size_t classCount; /* number of [] encountered */
size_t treeDepth; /* maximum depth of parse tree */
size_t progLength; /* estimated bytecode length */
RENode *result;
size_t classBitmapsMem; /* memory to hold all class bitmaps */
struct {
const jschar *start; /* small cache of class strings */
size_t length; /* since they're often the same */
size_t index;
} classCache[CLASS_CACHE_SIZE];
uint16 flags;
} CompilerState;
typedef struct EmitStateStackEntry {
jsbytecode *altHead; /* start of REOP_ALT* opcode */
jsbytecode *nextAltFixup; /* fixup pointer to next-alt offset */
jsbytecode *nextTermFixup; /* fixup ptr. to REOP_JUMP offset */
jsbytecode *endTermFixup; /* fixup ptr. to REOPT_ALTPREREQ* offset */
RENode *continueNode; /* original REOP_ALT* node being stacked */
jsbytecode continueOp; /* REOP_JUMP or REOP_ENDALT continuation */
JSPackedBool jumpToJumpFlag; /* true if we've patched jump-to-jump to
avoid 16-bit unsigned offset overflow */
} EmitStateStackEntry;
/*
* Immediate operand sizes and getter/setters. Unlike the ones in jsopcode.h,
* the getters and setters take the pc of the offset, not of the opcode before
* the offset.
*/
#define ARG_LEN 2
#define GET_ARG(pc) ((uint16)(((pc)[0] << 8) | (pc)[1]))
#define SET_ARG(pc, arg) ((pc)[0] = (jsbytecode) ((arg) >> 8), \
(pc)[1] = (jsbytecode) (arg))
#define OFFSET_LEN ARG_LEN
#define OFFSET_MAX (JS_BIT(ARG_LEN * 8) - 1)
#define GET_OFFSET(pc) GET_ARG(pc)
/*
* Maximum supported tree depth is maximum size of EmitStateStackEntry stack.
* For sanity, we limit it to 2^24 bytes.
*/
#define TREE_DEPTH_MAX (JS_BIT(24) / sizeof(EmitStateStackEntry))
/*
* The maximum memory that can be allocated for class bitmaps.
* For sanity, we limit it to 2^24 bytes.
*/
#define CLASS_BITMAPS_MEM_LIMIT JS_BIT(24)
/*
* Functions to get size and write/read bytecode that represent small indexes
* compactly.
* Each byte in the code represent 7-bit chunk of the index. 8th bit when set
* indicates that the following byte brings more bits to the index. Otherwise
* this is the last byte in the index bytecode representing highest index bits.
*/
static size_t
GetCompactIndexWidth(size_t index)
{
size_t width;
for (width = 1; (index >>= 7) != 0; ++width) { }
return width;
}
static jsbytecode *
WriteCompactIndex(jsbytecode *pc, size_t index)
{
size_t next;
while ((next = index >> 7) != 0) {
*pc++ = (jsbytecode)(index | 0x80);
index = next;
}
*pc++ = (jsbytecode)index;
return pc;
}
static jsbytecode *
ReadCompactIndex(jsbytecode *pc, size_t *result)
{
size_t nextByte;
nextByte = *pc++;
if ((nextByte & 0x80) == 0) {
/*
* Short-circuit the most common case when compact index <= 127.
*/
*result = nextByte;
} else {
size_t shift = 7;
*result = 0x7F & nextByte;
do {
nextByte = *pc++;
*result |= (nextByte & 0x7F) << shift;
shift += 7;
} while ((nextByte & 0x80) != 0);
}
return pc;
}
typedef struct RECapture {
ptrdiff_t index; /* start of contents, -1 for empty */
size_t length; /* length of capture */
} RECapture;
typedef struct REMatchState {
const jschar *cp;
RECapture parens[1]; /* first of 're->parenCount' captures,
allocated at end of this struct */
} REMatchState;
struct REBackTrackData;
typedef struct REProgState {
jsbytecode *continue_pc; /* current continuation data */
jsbytecode continue_op;
ptrdiff_t index; /* progress in text */
size_t parenSoFar; /* highest indexed paren started */
union {
struct {
uintN min; /* current quantifier limits */
uintN max;
} quantifier;
struct {
size_t top; /* backtrack stack state */
size_t sz;
} assertion;
} u;
} REProgState;
typedef struct REBackTrackData {
size_t sz; /* size of previous stack entry */
jsbytecode *backtrack_pc; /* where to backtrack to */
jsbytecode backtrack_op;
const jschar *cp; /* index in text of match at backtrack */
size_t parenIndex; /* start index of saved paren contents */
size_t parenCount; /* # of saved paren contents */
size_t saveStateStackTop; /* number of parent states */
/* saved parent states follow */
/* saved paren contents follow */
} REBackTrackData;
#define INITIAL_STATESTACK 100
#define INITIAL_BACKTRACK 8000
typedef struct REGlobalData {
JSContext *cx;
JSRegExp *regexp; /* the RE in execution */
JSBool ok; /* runtime error (out_of_memory only?) */
size_t start; /* offset to start at */
ptrdiff_t skipped; /* chars skipped anchoring this r.e. */
const jschar *cpbegin; /* text base address */
const jschar *cpend; /* text limit address */
REProgState *stateStack; /* stack of state of current parents */
size_t stateStackTop;
size_t stateStackLimit;
REBackTrackData *backTrackStack;/* stack of matched-so-far positions */
REBackTrackData *backTrackSP;
size_t backTrackStackSize;
size_t cursz; /* size of current stack entry */
JSArenaPool pool; /* It's faster to use one malloc'd pool
than to malloc/free the three items
that are allocated from this pool */
} REGlobalData;
/*
* 1. If IgnoreCase is false, return ch.
* 2. Let u be ch converted to upper case as if by calling
* String.prototype.toUpperCase on the one-character string ch.
* 3. If u does not consist of a single character, return ch.
* 4. Let cu be u's character.
* 5. If ch's code point value is greater than or equal to decimal 128 and cu's
* code point value is less than decimal 128, then return ch.
* 6. Return cu.
*/
static jschar
upcase(jschar ch)
{
jschar cu = JS_TOUPPER(ch);
if (ch >= 128 && cu < 128)
return ch;
return cu;
}
static jschar
downcase(jschar ch)
{
jschar cl = JS_TOLOWER(ch);
if (cl >= 128 && ch < 128)
return ch;
return cl;
}
/* Construct and initialize an RENode, returning NULL for out-of-memory */
static RENode *
NewRENode(CompilerState *state, REOp op)
{
JSContext *cx;
RENode *ren;
cx = state->context;
JS_ARENA_ALLOCATE_CAST(ren, RENode *, &cx->tempPool, sizeof *ren);
if (!ren) {
JS_ReportOutOfMemory(cx);
return NULL;
}
ren->op = op;
ren->next = NULL;
ren->kid = NULL;
return ren;
}
/*
* Validates and converts hex ascii value.
*/
static JSBool
isASCIIHexDigit(jschar c, uintN *digit)
{
uintN cv = c;
if (cv < '0')
return JS_FALSE;
if (cv <= '9') {
*digit = cv - '0';
return JS_TRUE;
}
cv |= 0x20;
if (cv >= 'a' && cv <= 'f') {
*digit = cv - 'a' + 10;
return JS_TRUE;
}
return JS_FALSE;
}
typedef struct {
REOp op;
const jschar *errPos;
size_t parenIndex;
} REOpData;
/*
* Process the op against the two top operands, reducing them to a single
* operand in the penultimate slot. Update progLength and treeDepth.
*/
static JSBool
ProcessOp(CompilerState *state, REOpData *opData, RENode **operandStack,
intN operandSP)
{
RENode *result;
switch (opData->op) {
case REOP_ALT:
result = NewRENode(state, REOP_ALT);
if (!result)
return JS_FALSE;
result->kid = operandStack[operandSP - 2];
result->u.kid2 = operandStack[operandSP - 1];
operandStack[operandSP - 2] = result;
if (state->treeDepth == TREE_DEPTH_MAX) {
js_ReportCompileErrorNumber(state->context, state->tokenStream,
JSREPORT_TS | JSREPORT_ERROR,
JSMSG_REGEXP_TOO_COMPLEX);
return JS_FALSE;
}
++state->treeDepth;
/*
* Look at both alternates to see if there's a FLAT or a CLASS at
* the start of each. If so, use a prerequisite match.
*/
if (((RENode *) result->kid)->op == REOP_FLAT &&
((RENode *) result->u.kid2)->op == REOP_FLAT &&
(state->flags & JSREG_FOLD) == 0) {
result->op = REOP_ALTPREREQ;
result->u.altprereq.ch1 = ((RENode *) result->kid)->u.flat.chr;
result->u.altprereq.ch2 = ((RENode *) result->u.kid2)->u.flat.chr;
/* ALTPREREQ, <end>, uch1, uch2, <next>, ...,
JUMP, <end> ... ENDALT */
state->progLength += 13;
}
else
if (((RENode *) result->kid)->op == REOP_CLASS &&
((RENode *) result->kid)->u.ucclass.index < 256 &&
((RENode *) result->u.kid2)->op == REOP_FLAT &&
(state->flags & JSREG_FOLD) == 0) {
result->op = REOP_ALTPREREQ2;
result->u.altprereq.ch1 = ((RENode *) result->u.kid2)->u.flat.chr;
result->u.altprereq.ch2 = ((RENode *) result->kid)->u.ucclass.index;
/* ALTPREREQ2, <end>, uch1, uch2, <next>, ...,
JUMP, <end> ... ENDALT */
state->progLength += 13;
}
else
if (((RENode *) result->kid)->op == REOP_FLAT &&
((RENode *) result->u.kid2)->op == REOP_CLASS &&
((RENode *) result->u.kid2)->u.ucclass.index < 256 &&
(state->flags & JSREG_FOLD) == 0) {
result->op = REOP_ALTPREREQ2;
result->u.altprereq.ch1 = ((RENode *) result->kid)->u.flat.chr;
result->u.altprereq.ch2 =
((RENode *) result->u.kid2)->u.ucclass.index;
/* ALTPREREQ2, <end>, uch1, uch2, <next>, ...,
JUMP, <end> ... ENDALT */
state->progLength += 13;
}
else {
/* ALT, <next>, ..., JUMP, <end> ... ENDALT */
state->progLength += 7;
}
break;
case REOP_CONCAT:
result = operandStack[operandSP - 2];
while (result->next)
result = result->next;
result->next = operandStack[operandSP - 1];
break;
case REOP_ASSERT:
case REOP_ASSERT_NOT:
case REOP_LPARENNON:
case REOP_LPAREN:
/* These should have been processed by a close paren. */
js_ReportCompileErrorNumberUC(state->context, state->tokenStream,
JSREPORT_TS | JSREPORT_ERROR,
JSMSG_MISSING_PAREN, opData->errPos);
return JS_FALSE;
default:;
}
return JS_TRUE;
}
/*
* Parser forward declarations.
*/
static JSBool ParseTerm(CompilerState *state);
static JSBool ParseQuantifier(CompilerState *state);
static intN ParseMinMaxQuantifier(CompilerState *state, JSBool ignoreValues);
/*
* Top-down regular expression grammar, based closely on Perl4.
*
* regexp: altern A regular expression is one or more
* altern '|' regexp alternatives separated by vertical bar.
*/
#define INITIAL_STACK_SIZE 128
static JSBool
ParseRegExp(CompilerState *state)
{
size_t parenIndex;
RENode *operand;
REOpData *operatorStack;
RENode **operandStack;
REOp op;
intN i;
JSBool result = JS_FALSE;
intN operatorSP = 0, operatorStackSize = INITIAL_STACK_SIZE;
intN operandSP = 0, operandStackSize = INITIAL_STACK_SIZE;
/* Watch out for empty regexp */
if (state->cp == state->cpend) {
state->result = NewRENode(state, REOP_EMPTY);
return (state->result != NULL);
}
operatorStack = (REOpData *)
JS_malloc(state->context, sizeof(REOpData) * operatorStackSize);
if (!operatorStack)
return JS_FALSE;
operandStack = (RENode **)
JS_malloc(state->context, sizeof(RENode *) * operandStackSize);
if (!operandStack)
goto out;
for (;;) {
parenIndex = state->parenCount;
if (state->cp == state->cpend) {
/*
* If we are at the end of the regexp and we're short one or more
* operands, the regexp must have the form /x|/ or some such, with
* left parentheses making us short more than one operand.
*/
if (operatorSP >= operandSP) {
operand = NewRENode(state, REOP_EMPTY);
if (!operand)
goto out;
goto pushOperand;
}
} else {
switch (*state->cp) {
case '(':
++state->cp;
if (state->cp + 1 < state->cpend &&
*state->cp == '?' &&
(state->cp[1] == '=' ||
state->cp[1] == '!' ||
state->cp[1] == ':')) {
switch (state->cp[1]) {
case '=':
op = REOP_ASSERT;
/* ASSERT, <next>, ... ASSERTTEST */
state->progLength += 4;
break;
case '!':
op = REOP_ASSERT_NOT;
/* ASSERTNOT, <next>, ... ASSERTNOTTEST */
state->progLength += 4;
break;
default:
op = REOP_LPARENNON;
break;
}
state->cp += 2;
} else {
op = REOP_LPAREN;
/* LPAREN, <index>, ... RPAREN, <index> */
state->progLength
+= 2 * (1 + GetCompactIndexWidth(parenIndex));
state->parenCount++;
if (state->parenCount == 65535) {
js_ReportCompileErrorNumber(state->context,
state->tokenStream,
JSREPORT_TS |
JSREPORT_ERROR,
JSMSG_TOO_MANY_PARENS);
goto out;
}
}
goto pushOperator;
case ')':
/*
* If there's no stacked open parenthesis, throw syntax error.
*/
for (i = operatorSP - 1; ; i--) {
if (i < 0) {
js_ReportCompileErrorNumber(state->context,
state->tokenStream,
JSREPORT_TS |
JSREPORT_ERROR,
JSMSG_UNMATCHED_RIGHT_PAREN);
goto out;
}
if (operatorStack[i].op == REOP_ASSERT ||
operatorStack[i].op == REOP_ASSERT_NOT ||
operatorStack[i].op == REOP_LPARENNON ||
operatorStack[i].op == REOP_LPAREN) {
break;
}
}
/* FALL THROUGH */
case '|':
/* Expected an operand before these, so make an empty one */
operand = NewRENode(state, REOP_EMPTY);
if (!operand)
goto out;
goto pushOperand;
default:
if (!ParseTerm(state))
goto out;
operand = state->result;
pushOperand:
if (operandSP == operandStackSize) {
operandStackSize += operandStackSize;
operandStack = (RENode **)
JS_realloc(state->context, operandStack,
sizeof(RENode *) * operandStackSize);
if (!operandStack)
goto out;
}
operandStack[operandSP++] = operand;
break;
}
}
/* At the end; process remaining operators. */
restartOperator:
if (state->cp == state->cpend) {
while (operatorSP) {
--operatorSP;
if (!ProcessOp(state, &operatorStack[operatorSP],
operandStack, operandSP))
goto out;
--operandSP;
}
JS_ASSERT(operandSP == 1);
state->result = operandStack[0];
result = JS_TRUE;
goto out;
}
switch (*state->cp) {
case '|':
/* Process any stacked 'concat' operators */
++state->cp;
while (operatorSP &&
operatorStack[operatorSP - 1].op == REOP_CONCAT) {
--operatorSP;
if (!ProcessOp(state, &operatorStack[operatorSP],
operandStack, operandSP)) {
goto out;
}
--operandSP;
}
op = REOP_ALT;
goto pushOperator;
case ')':
/*
* If there's no stacked open parenthesis, throw syntax error.
*/
for (i = operatorSP - 1; ; i--) {
if (i < 0) {
js_ReportCompileErrorNumber(state->context,
state->tokenStream,
JSREPORT_TS | JSREPORT_ERROR,
JSMSG_UNMATCHED_RIGHT_PAREN);
goto out;
}
if (operatorStack[i].op == REOP_ASSERT ||
operatorStack[i].op == REOP_ASSERT_NOT ||
operatorStack[i].op == REOP_LPARENNON ||
operatorStack[i].op == REOP_LPAREN) {
break;
}
}
++state->cp;
/* Process everything on the stack until the open parenthesis. */
for (;;) {
JS_ASSERT(operatorSP);
--operatorSP;
switch (operatorStack[operatorSP].op) {
case REOP_ASSERT:
case REOP_ASSERT_NOT:
case REOP_LPAREN:
operand = NewRENode(state, operatorStack[operatorSP].op);
if (!operand)
goto out;
operand->u.parenIndex =
operatorStack[operatorSP].parenIndex;
JS_ASSERT(operandSP);
operand->kid = operandStack[operandSP - 1];
operandStack[operandSP - 1] = operand;
if (state->treeDepth == TREE_DEPTH_MAX) {
js_ReportCompileErrorNumber(state->context,
state->tokenStream,
JSREPORT_TS |
JSREPORT_ERROR,
JSMSG_REGEXP_TOO_COMPLEX);
goto out;
}
++state->treeDepth;
/* FALL THROUGH */
case REOP_LPARENNON:
state->result = operandStack[operandSP - 1];
if (!ParseQuantifier(state))
goto out;
operandStack[operandSP - 1] = state->result;
goto restartOperator;
default:
if (!ProcessOp(state, &operatorStack[operatorSP],
operandStack, operandSP))
goto out;
--operandSP;
break;
}
}
break;
case '{':
{
const jschar *errp = state->cp;
if (ParseMinMaxQuantifier(state, JS_TRUE) < 0) {
/*
* This didn't even scan correctly as a quantifier, so we should
* treat it as flat.
*/
op = REOP_CONCAT;
goto pushOperator;
}
state->cp = errp;
/* FALL THROUGH */
}
case '+':
case '*':
case '?':
js_ReportCompileErrorNumberUC(state->context, state->tokenStream,
JSREPORT_TS | JSREPORT_ERROR,
JSMSG_BAD_QUANTIFIER, state->cp);
result = JS_FALSE;
goto out;
default:
/* Anything else is the start of the next term. */
op = REOP_CONCAT;
pushOperator:
if (operatorSP == operatorStackSize) {
operatorStackSize += operatorStackSize;
operatorStack = (REOpData *)
JS_realloc(state->context, operatorStack,
sizeof(REOpData) * operatorStackSize);
if (!operatorStack)
goto out;
}
operatorStack[operatorSP].op = op;
operatorStack[operatorSP].errPos = state->cp;
operatorStack[operatorSP++].parenIndex = parenIndex;
break;
}
}
out:
if (operatorStack)
JS_free(state->context, operatorStack);
if (operandStack)
JS_free(state->context, operandStack);
return result;
}
/*
* Hack two bits in CompilerState.flags, for use within FindParenCount to flag
* its being on the stack, and to propagate errors to its callers.
*/
#define JSREG_FIND_PAREN_COUNT 0x8000
#define JSREG_FIND_PAREN_ERROR 0x4000
/*
* Magic return value from FindParenCount and GetDecimalValue, to indicate
* overflow beyond GetDecimalValue's max parameter, or a computed maximum if
* its findMax parameter is non-null.
*/
#define OVERFLOW_VALUE ((uintN)-1)
static uintN
FindParenCount(CompilerState *state)
{
CompilerState temp;
int i;
if (state->flags & JSREG_FIND_PAREN_COUNT)
return OVERFLOW_VALUE;
/*
* Copy state into temp, flag it so we never report an invalid backref,
* and reset its members to parse the entire regexp. This is obviously
* suboptimal, but GetDecimalValue calls us only if a backref appears to
* refer to a forward parenthetical, which is rare.
*/
temp = *state;
temp.flags |= JSREG_FIND_PAREN_COUNT;
temp.cp = temp.cpbegin;
temp.parenCount = 0;
temp.classCount = 0;
temp.progLength = 0;
temp.treeDepth = 0;
temp.classBitmapsMem = 0;
for (i = 0; i < CLASS_CACHE_SIZE; i++)
temp.classCache[i].start = NULL;
if (!ParseRegExp(&temp)) {
state->flags |= JSREG_FIND_PAREN_ERROR;
return OVERFLOW_VALUE;
}
return temp.parenCount;
}
/*
* Extract and return a decimal value at state->cp. The initial character c
* has already been read. Return OVERFLOW_VALUE if the result exceeds max.
* Callers who pass a non-null findMax should test JSREG_FIND_PAREN_ERROR in
* state->flags to discover whether an error occurred under findMax.
*/
static uintN
GetDecimalValue(jschar c, uintN max, uintN (*findMax)(CompilerState *state),
CompilerState *state)
{
uintN value = JS7_UNDEC(c);
JSBool overflow = (value > max && (!findMax || value > findMax(state)));
/* The following restriction allows simpler overflow checks. */
JS_ASSERT(max <= ((uintN)-1 - 9) / 10);
while (state->cp < state->cpend) {
c = *state->cp;
if (!JS7_ISDEC(c))
break;
value = 10 * value + JS7_UNDEC(c);
if (!overflow && value > max && (!findMax || value > findMax(state)))
overflow = JS_TRUE;
++state->cp;
}
return overflow ? OVERFLOW_VALUE : value;
}
/*
* Calculate the total size of the bitmap required for a class expression.
*/
static JSBool
CalculateBitmapSize(CompilerState *state, RENode *target, const jschar *src,
const jschar *end)
{
uintN max = 0;
JSBool inRange = JS_FALSE;
jschar c, rangeStart = 0;
uintN n, digit, nDigits, i;
target->u.ucclass.bmsize = 0;
target->u.ucclass.sense = JS_TRUE;
if (src == end)
return JS_TRUE;
if (*src == '^') {
++src;
target->u.ucclass.sense = JS_FALSE;
}
while (src != end) {
uintN localMax = 0;
switch (*src) {
case '\\':
++src;
c = *src++;
switch (c) {
case 'b':
localMax = 0x8;
break;
case 'f':
localMax = 0xC;
break;
case 'n':
localMax = 0xA;
break;
case 'r':
localMax = 0xD;
break;
case 't':
localMax = 0x9;
break;
case 'v':
localMax = 0xB;
break;
case 'c':
if (src < end && RE_IS_LETTER(*src)) {
localMax = (jschar) (*src++ & 0x1F);
} else {
--src;
localMax = '\\';
}
break;
case 'x':
nDigits = 2;
goto lexHex;
case 'u':
nDigits = 4;
lexHex:
n = 0;
for (i = 0; (i < nDigits) && (src < end); i++) {
c = *src++;
if (!isASCIIHexDigit(c, &digit)) {
/*
* Back off to accepting the original
*'\' as a literal.
*/
src -= i + 1;
n = '\\';
break;
}
n = (n << 4) | digit;
}
localMax = n;
break;
case 'd':
if (inRange) {
JS_ReportErrorNumber(state->context,
js_GetErrorMessage, NULL,
JSMSG_BAD_CLASS_RANGE);
return JS_FALSE;
}
localMax = '9';
break;
case 'D':
case 's':
case 'S':
case 'w':
case 'W':
if (inRange) {
JS_ReportErrorNumber(state->context,
js_GetErrorMessage, NULL,
JSMSG_BAD_CLASS_RANGE);
return JS_FALSE;
}
target->u.ucclass.bmsize = 65535;
return JS_TRUE;
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
/*
* This is a non-ECMA extension - decimal escapes (in this
* case, octal!) are supposed to be an error inside class
* ranges, but supported here for backwards compatibility.
*
*/
n = JS7_UNDEC(c);
c = *src;
if ('0' <= c && c <= '7') {
src++;
n = 8 * n + JS7_UNDEC(c);
c = *src;
if ('0' <= c && c <= '7') {
src++;
i = 8 * n + JS7_UNDEC(c);
if (i <= 0377)
n = i;
else
src--;
}
}
localMax = n;
break;
default:
localMax = c;
break;
}
break;
default:
localMax = *src++;
break;
}
if (state->flags & JSREG_FOLD) {
c = JS_MAX(upcase((jschar) localMax), downcase((jschar) localMax));
if (c > localMax)
localMax = c;
}
if (inRange) {
if (rangeStart > localMax) {
JS_ReportErrorNumber(state->context,
js_GetErrorMessage, NULL,
JSMSG_BAD_CLASS_RANGE);
return JS_FALSE;
}
inRange = JS_FALSE;
} else {
if (src < end - 1) {
if (*src == '-') {
++src;
inRange = JS_TRUE;
rangeStart = (jschar)localMax;
continue;
}
}
}
if (localMax > max)
max = localMax;
}
target->u.ucclass.bmsize = max;
return JS_TRUE;
}
/*
* item: assertion An item is either an assertion or
* quantatom a quantified atom.
*
* assertion: '^' Assertions match beginning of string
* (or line if the class static property
* RegExp.multiline is true).
* '$' End of string (or line if the class
* static property RegExp.multiline is
* true).
* '\b' Word boundary (between \w and \W).
* '\B' Word non-boundary.
*
* quantatom: atom An unquantified atom.
* quantatom '{' n ',' m '}'
* Atom must occur between n and m times.
* quantatom '{' n ',' '}' Atom must occur at least n times.
* quantatom '{' n '}' Atom must occur exactly n times.
* quantatom '*' Zero or more times (same as {0,}).
* quantatom '+' One or more times (same as {1,}).
* quantatom '?' Zero or one time (same as {0,1}).
*
* any of which can be optionally followed by '?' for ungreedy
*
* atom: '(' regexp ')' A parenthesized regexp (what matched
* can be addressed using a backreference,
* see '\' n below).
* '.' Matches any char except '\n'.
* '[' classlist ']' A character class.
* '[' '^' classlist ']' A negated character class.
* '\f' Form Feed.
* '\n' Newline (Line Feed).
* '\r' Carriage Return.
* '\t' Horizontal Tab.
* '\v' Vertical Tab.
* '\d' A digit (same as [0-9]).
* '\D' A non-digit.
* '\w' A word character, [0-9a-z_A-Z].
* '\W' A non-word character.
* '\s' A whitespace character, [ \b\f\n\r\t\v].
* '\S' A non-whitespace character.
* '\' n A backreference to the nth (n decimal
* and positive) parenthesized expression.
* '\' octal An octal escape sequence (octal must be
* two or three digits long, unless it is
* 0 for the null character).
* '\x' hex A hex escape (hex must be two digits).
* '\u' unicode A unicode escape (must be four digits).
* '\c' ctrl A control character, ctrl is a letter.
* '\' literalatomchar Any character except one of the above
* that follow '\' in an atom.
* otheratomchar Any character not first among the other
* atom right-hand sides.
*/
static JSBool
ParseTerm(CompilerState *state)
{
jschar c = *state->cp++;
uintN nDigits;
uintN num, tmp, n, i;
const jschar *termStart;
switch (c) {
/* assertions and atoms */
case '^':
state->result = NewRENode(state, REOP_BOL);
if (!state->result)
return JS_FALSE;
state->progLength++;
return JS_TRUE;
case '$':
state->result = NewRENode(state, REOP_EOL);
if (!state->result)
return JS_FALSE;
state->progLength++;
return JS_TRUE;
case '\\':
if (state->cp >= state->cpend) {
/* a trailing '\' is an error */
js_ReportCompileErrorNumber(state->context, state->tokenStream,
JSREPORT_TS | JSREPORT_ERROR,
JSMSG_TRAILING_SLASH);
return JS_FALSE;
}
c = *state->cp++;
switch (c) {
/* assertion escapes */
case 'b' :
state->result = NewRENode(state, REOP_WBDRY);
if (!state->result)
return JS_FALSE;
state->progLength++;
return JS_TRUE;
case 'B':
state->result = NewRENode(state, REOP_WNONBDRY);
if (!state->result)
return JS_FALSE;
state->progLength++;
return JS_TRUE;
/* Decimal escape */
case '0':
/* Give a strict warning. See also the note below. */
if (!js_ReportCompileErrorNumber(state->context,
state->tokenStream,
JSREPORT_TS |
JSREPORT_WARNING |
JSREPORT_STRICT,
JSMSG_INVALID_BACKREF)) {
return JS_FALSE;
}
doOctal:
num = 0;
while (state->cp < state->cpend) {
c = *state->cp;
if (c < '0' || '7' < c)
break;
state->cp++;
tmp = 8 * num + (uintN)JS7_UNDEC(c);
if (tmp > 0377)
break;
num = tmp;
}
c = (jschar)num;
doFlat:
state->result = NewRENode(state, REOP_FLAT);
if (!state->result)
return JS_FALSE;
state->result->u.flat.chr = c;
state->result->u.flat.length = 1;
state->progLength += 3;
break;
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
termStart = state->cp - 1;
num = GetDecimalValue(c, state->parenCount, FindParenCount, state);
if (state->flags & JSREG_FIND_PAREN_ERROR)
return JS_FALSE;
if (num == OVERFLOW_VALUE) {
/* Give a strict mode warning. */
if (!js_ReportCompileErrorNumber(state->context,
state->tokenStream,
JSREPORT_TS |
JSREPORT_WARNING |
JSREPORT_STRICT,
(c >= '8')
? JSMSG_INVALID_BACKREF
: JSMSG_BAD_BACKREF)) {
return JS_FALSE;
}
/*
* Note: ECMA 262, 15.10.2.9 says that we should throw a syntax
* error here. However, for compatibility with IE, we treat the
* whole backref as flat if the first character in it is not a
* valid octal character, and as an octal escape otherwise.
*/
state->cp = termStart;
if (c >= '8') {
/* Treat this as flat. termStart - 1 is the \. */
c = '\\';
goto asFlat;
}
/* Treat this as an octal escape. */
goto doOctal;
}
JS_ASSERT(1 <= num && num <= 0x10000);
state->result = NewRENode(state, REOP_BACKREF);
if (!state->result)
return JS_FALSE;
state->result->u.parenIndex = num - 1;
state->progLength
+= 1 + GetCompactIndexWidth(state->result->u.parenIndex);
break;
/* Control escape */
case 'f':
c = 0xC;
goto doFlat;
case 'n':
c = 0xA;
goto doFlat;
case 'r':
c = 0xD;
goto doFlat;
case 't':
c = 0x9;
goto doFlat;
case 'v':
c = 0xB;
goto doFlat;
/* Control letter */
case 'c':
if (state->cp < state->cpend && RE_IS_LETTER(*state->cp)) {
c = (jschar) (*state->cp++ & 0x1F);
} else {
/* back off to accepting the original '\' as a literal */
--state->cp;
c = '\\';
}
goto doFlat;
/* HexEscapeSequence */
case 'x':
nDigits = 2;
goto lexHex;
/* UnicodeEscapeSequence */
case 'u':
nDigits = 4;
lexHex:
n = 0;
for (i = 0; i < nDigits && state->cp < state->cpend; i++) {
uintN digit;
c = *state->cp++;
if (!isASCIIHexDigit(c, &digit)) {
/*
* Back off to accepting the original 'u' or 'x' as a
* literal.
*/
state->cp -= i + 2;
n = *state->cp++;
break;
}
n = (n << 4) | digit;
}
c = (jschar) n;
goto doFlat;
/* Character class escapes */
case 'd':
state->result = NewRENode(state, REOP_DIGIT);
doSimple:
if (!state->result)
return JS_FALSE;
state->progLength++;
break;
case 'D':
state->result = NewRENode(state, REOP_NONDIGIT);
goto doSimple;
case 's':
state->result = NewRENode(state, REOP_SPACE);
goto doSimple;
case 'S':
state->result = NewRENode(state, REOP_NONSPACE);
goto doSimple;
case 'w':
state->result = NewRENode(state, REOP_ALNUM);
goto doSimple;
case 'W':
state->result = NewRENode(state, REOP_NONALNUM);
goto doSimple;
/* IdentityEscape */
default:
state->result = NewRENode(state, REOP_FLAT);
if (!state->result)
return JS_FALSE;
state->result->u.flat.chr = c;
state->result->u.flat.length = 1;
state->result->kid = (void *) (state->cp - 1);
state->progLength += 3;
break;
}
break;
case '[':
state->result = NewRENode(state, REOP_CLASS);
if (!state->result)
return JS_FALSE;
termStart = state->cp;
state->result->u.ucclass.startIndex = termStart - state->cpbegin;
for (;;) {
if (state->cp == state->cpend) {
js_ReportCompileErrorNumberUC(state->context, state->tokenStream,
JSREPORT_TS | JSREPORT_ERROR,
JSMSG_UNTERM_CLASS, termStart);
return JS_FALSE;
}
if (*state->cp == '\\') {
state->cp++;
if (state->cp != state->cpend)
state->cp++;
continue;
}
if (*state->cp == ']') {
state->result->u.ucclass.kidlen = state->cp - termStart;
break;
}
state->cp++;
}
for (i = 0; i < CLASS_CACHE_SIZE; i++) {
if (!state->classCache[i].start) {
state->classCache[i].start = termStart;
state->classCache[i].length = state->result->u.ucclass.kidlen;
state->classCache[i].index = state->classCount;
break;
}
if (state->classCache[i].length ==
state->result->u.ucclass.kidlen) {
for (n = 0; ; n++) {
if (n == state->classCache[i].length) {
state->result->u.ucclass.index
= state->classCache[i].index;
goto claim;
}
if (state->classCache[i].start[n] != termStart[n])
break;
}
}
}
state->result->u.ucclass.index = state->classCount++;
claim:
/*
* Call CalculateBitmapSize now as we want any errors it finds
* to be reported during the parse phase, not at execution.
*/
if (!CalculateBitmapSize(state, state->result, termStart, state->cp++))
return JS_FALSE;
/*
* Update classBitmapsMem with number of bytes to hold bmsize bits,
* which is (bitsCount + 7) / 8 or (highest_bit + 1 + 7) / 8
* or highest_bit / 8 + 1 where highest_bit is u.ucclass.bmsize.
*/
n = (state->result->u.ucclass.bmsize >> 3) + 1;
if (n > CLASS_BITMAPS_MEM_LIMIT - state->classBitmapsMem) {
js_ReportCompileErrorNumber(state->context, state->tokenStream,
JSREPORT_TS | JSREPORT_ERROR,
JSMSG_REGEXP_TOO_COMPLEX);
return JS_FALSE;
}
state->classBitmapsMem += n;
/* CLASS, <index> */
state->progLength
+= 1 + GetCompactIndexWidth(state->result->u.ucclass.index);
break;
case '.':
state->result = NewRENode(state, REOP_DOT);
goto doSimple;
case '{':
{
const jschar *errp = state->cp--;
intN err;
err = ParseMinMaxQuantifier(state, JS_TRUE);
state->cp = errp;
if (err < 0)
goto asFlat;
/* FALL THROUGH */
}
case '*':
case '+':
case '?':
js_ReportCompileErrorNumberUC(state->context, state->tokenStream,
JSREPORT_TS | JSREPORT_ERROR,
JSMSG_BAD_QUANTIFIER, state->cp - 1);
return JS_FALSE;
default:
asFlat:
state->result = NewRENode(state, REOP_FLAT);
if (!state->result)
return JS_FALSE;
state->result->u.flat.chr = c;
state->result->u.flat.length = 1;
state->result->kid = (void *) (state->cp - 1);
state->progLength += 3;
break;
}
return ParseQuantifier(state);
}
static JSBool
ParseQuantifier(CompilerState *state)
{
RENode *term;
term = state->result;
if (state->cp < state->cpend) {
switch (*state->cp) {
case '+':
state->result = NewRENode(state, REOP_QUANT);
if (!state->result)
return JS_FALSE;
state->result->u.range.min = 1;
state->result->u.range.max = (uintN)-1;
/* <PLUS>, <next> ... <ENDCHILD> */
state->progLength += 4;
goto quantifier;
case '*':
state->result = NewRENode(state, REOP_QUANT);
if (!state->result)
return JS_FALSE;
state->result->u.range.min = 0;
state->result->u.range.max = (uintN)-1;
/* <STAR>, <next> ... <ENDCHILD> */
state->progLength += 4;
goto quantifier;
case '?':
state->result = NewRENode(state, REOP_QUANT);
if (!state->result)
return JS_FALSE;
state->result->u.range.min = 0;
state->result->u.range.max = 1;
/* <OPT>, <next> ... <ENDCHILD> */
state->progLength += 4;
goto quantifier;
case '{': /* balance '}' */
{
intN err;
const jschar *errp = state->cp;
err = ParseMinMaxQuantifier(state, JS_FALSE);
if (err == 0)
goto quantifier;
if (err == -1)
return JS_TRUE;
js_ReportCompileErrorNumberUC(state->context,
state->tokenStream,
JSREPORT_TS | JSREPORT_ERROR,
err, errp);
return JS_FALSE;
}
default:;
}
}
return JS_TRUE;
quantifier:
if (state->treeDepth == TREE_DEPTH_MAX) {
js_ReportCompileErrorNumber(state->context, state->tokenStream,
JSREPORT_TS | JSREPORT_ERROR,
JSMSG_REGEXP_TOO_COMPLEX);
return JS_FALSE;
}
++state->treeDepth;
++state->cp;
state->result->kid = term;
if (state->cp < state->cpend && *state->cp == '?') {
++state->cp;
state->result->u.range.greedy = JS_FALSE;
} else {
state->result->u.range.greedy = JS_TRUE;
}
return JS_TRUE;
}
static intN
ParseMinMaxQuantifier(CompilerState *state, JSBool ignoreValues)
{
uintN min, max;
jschar c;
const jschar *errp = state->cp++;
c = *state->cp;
if (JS7_ISDEC(c)) {
++state->cp;
min = GetDecimalValue(c, 0xFFFF, NULL, state);
c = *state->cp;
if (!ignoreValues && min == OVERFLOW_VALUE)
return JSMSG_MIN_TOO_BIG;
if (c == ',') {
c = *++state->cp;
if (JS7_ISDEC(c)) {
++state->cp;
max = GetDecimalValue(c, 0xFFFF, NULL, state);
c = *state->cp;
if (!ignoreValues && max == OVERFLOW_VALUE)
return JSMSG_MAX_TOO_BIG;
if (!ignoreValues && min > max)
return JSMSG_OUT_OF_ORDER;
} else {
max = (uintN)-1;
}
} else {
max = min;
}
if (c == '}') {
state->result = NewRENode(state, REOP_QUANT);
if (!state->result)
return JS_FALSE;
state->result->u.range.min = min;
state->result->u.range.max = max;
/*
* QUANT, <min>, <max>, <next> ... <ENDCHILD>
* where <max> is written as compact(max+1) to make
* (uintN)-1 sentinel to occupy 1 byte, not width_of(max)+1.
*/
state->progLength += (1 + GetCompactIndexWidth(min)
+ GetCompactIndexWidth(max + 1)
+3);
return 0;
}
}
state->cp = errp;
return -1;
}
static JSBool
SetForwardJumpOffset(jsbytecode *jump, jsbytecode *target)
{
ptrdiff_t offset = target - jump;
/* Check that target really points forward. */
JS_ASSERT(offset >= 2);
if ((size_t)offset > OFFSET_MAX)
return JS_FALSE;
jump[0] = JUMP_OFFSET_HI(offset);
jump[1] = JUMP_OFFSET_LO(offset);
return JS_TRUE;
}
/*
* Generate bytecode for the tree rooted at t using an explicit stack instead
* of recursion.
*/
static jsbytecode *
EmitREBytecode(CompilerState *state, JSRegExp *re, size_t treeDepth,
jsbytecode *pc, RENode *t)
{
EmitStateStackEntry *emitStateSP, *emitStateStack;
RECharSet *charSet;
REOp op;
if (treeDepth == 0) {
emitStateStack = NULL;
} else {
emitStateStack =
(EmitStateStackEntry *)JS_malloc(state->context,
sizeof(EmitStateStackEntry) *
treeDepth);
if (!emitStateStack)
return NULL;
}
emitStateSP = emitStateStack;
op = t->op;
for (;;) {
*pc++ = op;
switch (op) {
case REOP_EMPTY:
--pc;
break;
case REOP_ALTPREREQ2:
case REOP_ALTPREREQ:
JS_ASSERT(emitStateSP);
emitStateSP->altHead = pc - 1;
emitStateSP->endTermFixup = pc;
pc += OFFSET_LEN;
SET_ARG(pc, t->u.altprereq.ch1);
pc += ARG_LEN;
SET_ARG(pc, t->u.altprereq.ch2);
pc += ARG_LEN;
emitStateSP->nextAltFixup = pc; /* offset to next alternate */
pc += OFFSET_LEN;
emitStateSP->continueNode = t;
emitStateSP->continueOp = REOP_JUMP;
emitStateSP->jumpToJumpFlag = JS_FALSE;
++emitStateSP;
JS_ASSERT((size_t)(emitStateSP - emitStateStack) <= treeDepth);
t = (RENode *) t->kid;
op = t->op;
continue;
case REOP_JUMP:
emitStateSP->nextTermFixup = pc; /* offset to following term */
pc += OFFSET_LEN;
if (!SetForwardJumpOffset(emitStateSP->nextAltFixup, pc))
goto jump_too_big;
emitStateSP->continueOp = REOP_ENDALT;
++emitStateSP;
JS_ASSERT((size_t)(emitStateSP - emitStateStack) <= treeDepth);
t = t->u.kid2;
op = t->op;
continue;
case REOP_ENDALT:
/*
* If we already patched emitStateSP->nextTermFixup to jump to
* a nearer jump, to avoid 16-bit immediate offset overflow, we
* are done here.
*/
if (emitStateSP->jumpToJumpFlag)
break;
/*
* Fix up the REOP_JUMP offset to go to the op after REOP_ENDALT.
* REOP_ENDALT is executed only on successful match of the last
* alternate in a group.
*/
if (!SetForwardJumpOffset(emitStateSP->nextTermFixup, pc))
goto jump_too_big;
if (t->op != REOP_ALT) {
if (!SetForwardJumpOffset(emitStateSP->endTermFixup, pc))
goto jump_too_big;
}
/*
* If the program is bigger than the REOP_JUMP offset range, then
* we must check for alternates before this one that are part of
* the same group, and fix up their jump offsets to target jumps
* close enough to fit in a 16-bit unsigned offset immediate.
*/
if ((size_t)(pc - re->program) > OFFSET_MAX &&
emitStateSP > emitStateStack) {
EmitStateStackEntry *esp, *esp2;
jsbytecode *alt, *jump;
ptrdiff_t span, header;
esp2 = emitStateSP;
alt = esp2->altHead;
for (esp = esp2 - 1; esp >= emitStateStack; --esp) {
if (esp->continueOp == REOP_ENDALT &&
!esp->jumpToJumpFlag &&
esp->nextTermFixup + OFFSET_LEN == alt &&
(size_t)(pc - ((esp->continueNode->op != REOP_ALT)
? esp->endTermFixup
: esp->nextTermFixup)) > OFFSET_MAX) {
alt = esp->altHead;
jump = esp->nextTermFixup;
/*
* The span must be 1 less than the distance from
* jump offset to jump offset, so we actually jump
* to a REOP_JUMP bytecode, not to its offset!
*/
for (;;) {
JS_ASSERT(jump < esp2->nextTermFixup);
span = esp2->nextTermFixup - jump - 1;
if ((size_t)span <= OFFSET_MAX)
break;
do {
if (--esp2 == esp)
goto jump_too_big;
} while (esp2->continueOp != REOP_ENDALT);
}
jump[0] = JUMP_OFFSET_HI(span);
jump[1] = JUMP_OFFSET_LO(span);
if (esp->continueNode->op != REOP_ALT) {
/*
* We must patch the offset at esp->endTermFixup
* as well, for the REOP_ALTPREREQ{,2} opcodes.
* If we're unlucky and endTermFixup is more than
* OFFSET_MAX bytes from its target, we cheat by
* jumping 6 bytes to the jump whose offset is at
* esp->nextTermFixup, which has the same target.
*/
jump = esp->endTermFixup;
header = esp->nextTermFixup - jump;
span += header;
if ((size_t)span > OFFSET_MAX)
span = header;
jump[0] = JUMP_OFFSET_HI(span);
jump[1] = JUMP_OFFSET_LO(span);
}
esp->jumpToJumpFlag = JS_TRUE;
}
}
}
break;
case REOP_ALT:
JS_ASSERT(emitStateSP);
emitStateSP->altHead = pc - 1;
emitStateSP->nextAltFixup = pc; /* offset to next alternate */
pc += OFFSET_LEN;
emitStateSP->continueNode = t;
emitStateSP->continueOp = REOP_JUMP;
emitStateSP->jumpToJumpFlag = JS_FALSE;
++emitStateSP;
JS_ASSERT((size_t)(emitStateSP - emitStateStack) <= treeDepth);
t = t->kid;
op = t->op;
continue;
case REOP_FLAT:
/*
* Coalesce FLATs if possible and if it would not increase bytecode
* beyond preallocated limit. The latter happens only when bytecode
* size for coalesced string with offset p and length 2 exceeds 6
* bytes preallocated for 2 single char nodes, i.e. when
* 1 + GetCompactIndexWidth(p) + GetCompactIndexWidth(2) > 6 or
* GetCompactIndexWidth(p) > 4.
* Since when GetCompactIndexWidth(p) <= 4 coalescing of 3 or more
* nodes strictly decreases bytecode size, the check has to be
* done only for the first coalescing.
*/
if (t->kid &&
GetCompactIndexWidth((jschar *)t->kid - state->cpbegin) <= 4)
{
while (t->next &&
t->next->op == REOP_FLAT &&
(jschar*)t->kid + t->u.flat.length ==
(jschar*)t->next->kid) {
t->u.flat.length += t->next->u.flat.length;
t->next = t->next->next;
}
}
if (t->kid && t->u.flat.length > 1) {
pc[-1] = (state->flags & JSREG_FOLD) ? REOP_FLATi : REOP_FLAT;
pc = WriteCompactIndex(pc, (jschar *)t->kid - state->cpbegin);
pc = WriteCompactIndex(pc, t->u.flat.length);
} else if (t->u.flat.chr < 256) {
pc[-1] = (state->flags & JSREG_FOLD) ? REOP_FLAT1i : REOP_FLAT1;
*pc++ = (jsbytecode) t->u.flat.chr;
} else {
pc[-1] = (state->flags & JSREG_FOLD)
? REOP_UCFLAT1i
: REOP_UCFLAT1;
SET_ARG(pc, t->u.flat.chr);
pc += ARG_LEN;
}
break;
case REOP_LPAREN:
JS_ASSERT(emitStateSP);
pc = WriteCompactIndex(pc, t->u.parenIndex);
emitStateSP->continueNode = t;
emitStateSP->continueOp = REOP_RPAREN;
++emitStateSP;
JS_ASSERT((size_t)(emitStateSP - emitStateStack) <= treeDepth);
t = (RENode *) t->kid;
op = t->op;
continue;
case REOP_RPAREN:
pc = WriteCompactIndex(pc, t->u.parenIndex);
break;
case REOP_BACKREF:
pc = WriteCompactIndex(pc, t->u.parenIndex);
break;
case REOP_ASSERT:
JS_ASSERT(emitStateSP);
emitStateSP->nextTermFixup = pc;
pc += OFFSET_LEN;
emitStateSP->continueNode = t;
emitStateSP->continueOp = REOP_ASSERTTEST;
++emitStateSP;
JS_ASSERT((size_t)(emitStateSP - emitStateStack) <= treeDepth);
t = (RENode *) t->kid;
op = t->op;
continue;
case REOP_ASSERTTEST:
case REOP_ASSERTNOTTEST:
if (!SetForwardJumpOffset(emitStateSP->nextTermFixup, pc))
goto jump_too_big;
break;
case REOP_ASSERT_NOT:
JS_ASSERT(emitStateSP);
emitStateSP->nextTermFixup = pc;
pc += OFFSET_LEN;
emitStateSP->continueNode = t;
emitStateSP->continueOp = REOP_ASSERTNOTTEST;
++emitStateSP;
JS_ASSERT((size_t)(emitStateSP - emitStateStack) <= treeDepth);
t = (RENode *) t->kid;
op = t->op;
continue;
case REOP_QUANT:
JS_ASSERT(emitStateSP);
if (t->u.range.min == 0 && t->u.range.max == (uintN)-1) {
pc[-1] = (t->u.range.greedy) ? REOP_STAR : REOP_MINIMALSTAR;
} else if (t->u.range.min == 0 && t->u.range.max == 1) {
pc[-1] = (t->u.range.greedy) ? REOP_OPT : REOP_MINIMALOPT;
} else if (t->u.range.min == 1 && t->u.range.max == (uintN) -1) {
pc[-1] = (t->u.range.greedy) ? REOP_PLUS : REOP_MINIMALPLUS;
} else {
if (!t->u.range.greedy)
pc[-1] = REOP_MINIMALQUANT;
pc = WriteCompactIndex(pc, t->u.range.min);
/*
* Write max + 1 to avoid using size_t(max) + 1 bytes
* for (uintN)-1 sentinel.
*/
pc = WriteCompactIndex(pc, t->u.range.max + 1);
}
emitStateSP->nextTermFixup = pc;
pc += OFFSET_LEN;
emitStateSP->continueNode = t;
emitStateSP->continueOp = REOP_ENDCHILD;
++emitStateSP;
JS_ASSERT((size_t)(emitStateSP - emitStateStack) <= treeDepth);
t = (RENode *) t->kid;
op = t->op;
continue;
case REOP_ENDCHILD:
if (!SetForwardJumpOffset(emitStateSP->nextTermFixup, pc))
goto jump_too_big;
break;
case REOP_CLASS:
if (!t->u.ucclass.sense)
pc[-1] = REOP_NCLASS;
pc = WriteCompactIndex(pc, t->u.ucclass.index);
charSet = &re->classList[t->u.ucclass.index];
charSet->converted = JS_FALSE;
charSet->length = t->u.ucclass.bmsize;
charSet->u.src.startIndex = t->u.ucclass.startIndex;
charSet->u.src.length = t->u.ucclass.kidlen;
charSet->sense = t->u.ucclass.sense;
break;
default:
break;
}
t = t->next;
if (t) {
op = t->op;
} else {
if (emitStateSP == emitStateStack)
break;
--emitStateSP;
t = emitStateSP->continueNode;
op = emitStateSP->continueOp;
}
}
cleanup:
if (emitStateStack)
JS_free(state->context, emitStateStack);
return pc;
jump_too_big:
js_ReportCompileErrorNumber(state->context, state->tokenStream,
JSREPORT_TS | JSREPORT_ERROR,
JSMSG_REGEXP_TOO_COMPLEX);
pc = NULL;
goto cleanup;
}
JSRegExp *
js_NewRegExp(JSContext *cx, JSTokenStream *ts,
JSString *str, uintN flags, JSBool flat)
{
JSRegExp *re;
void *mark;
CompilerState state;
size_t resize;
jsbytecode *endPC;
uintN i;
size_t len;
re = NULL;
mark = JS_ARENA_MARK(&cx->tempPool);
len = JSSTRING_LENGTH(str);
state.context = cx;
state.tokenStream = ts;
state.cp = js_UndependString(cx, str);
if (!state.cp)
goto out;
state.cpbegin = state.cp;
state.cpend = state.cp + len;
state.flags = flags;
state.parenCount = 0;
state.classCount = 0;
state.progLength = 0;
state.treeDepth = 0;
state.classBitmapsMem = 0;
for (i = 0; i < CLASS_CACHE_SIZE; i++)
state.classCache[i].start = NULL;
if (len != 0 && flat) {
state.result = NewRENode(&state, REOP_FLAT);
state.result->u.flat.chr = *state.cpbegin;
state.result->u.flat.length = len;
state.result->kid = (void *) state.cpbegin;
/* Flat bytecode: REOP_FLAT compact(string_offset) compact(len). */
state.progLength += 1 + GetCompactIndexWidth(0)
+ GetCompactIndexWidth(len);
} else {
if (!ParseRegExp(&state))
goto out;
}
resize = offsetof(JSRegExp, program) + state.progLength + 1;
re = (JSRegExp *) JS_malloc(cx, resize);
if (!re)
goto out;
re->nrefs = 1;
JS_ASSERT(state.classBitmapsMem <= CLASS_BITMAPS_MEM_LIMIT);
re->classCount = state.classCount;
if (re->classCount) {
re->classList = (RECharSet *)
JS_malloc(cx, re->classCount * sizeof(RECharSet));
if (!re->classList) {
js_DestroyRegExp(cx, re);
re = NULL;
goto out;
}
for (i = 0; i < re->classCount; i++)
re->classList[i].converted = JS_FALSE;
} else {
re->classList = NULL;
}
endPC = EmitREBytecode(&state, re, state.treeDepth, re->program, state.result);
if (!endPC) {
js_DestroyRegExp(cx, re);
re = NULL;
goto out;
}
*endPC++ = REOP_END;
/*
* Check whether size was overestimated and shrink using realloc.
* This is safe since no pointers to newly parsed regexp or its parts
* besides re exist here.
*/
if ((size_t)(endPC - re->program) != state.progLength + 1) {
JSRegExp *tmp;
JS_ASSERT((size_t)(endPC - re->program) < state.progLength + 1);
resize = offsetof(JSRegExp, program) + (endPC - re->program);
tmp = (JSRegExp *) JS_realloc(cx, re, resize);
if (tmp)
re = tmp;
}
re->flags = flags;
re->cloneIndex = 0;
re->parenCount = state.parenCount;
re->source = str;
out:
JS_ARENA_RELEASE(&cx->tempPool, mark);
return re;
}
JSRegExp *
js_NewRegExpOpt(JSContext *cx, JSTokenStream *ts,
JSString *str, JSString *opt, JSBool flat)
{
uintN flags;
jschar *s;
size_t i, n;
char charBuf[2];
flags = 0;
if (opt) {
s = JSSTRING_CHARS(opt);
for (i = 0, n = JSSTRING_LENGTH(opt); i < n; i++) {
switch (s[i]) {
case 'g':
flags |= JSREG_GLOB;
break;
case 'i':
flags |= JSREG_FOLD;
break;
case 'm':
flags |= JSREG_MULTILINE;
break;
default:
charBuf[0] = (char)s[i];
charBuf[1] = '\0';
js_ReportCompileErrorNumber(cx, ts,
JSREPORT_TS | JSREPORT_ERROR,
JSMSG_BAD_FLAG, charBuf);
return NULL;
}
}
}
return js_NewRegExp(cx, ts, str, flags, flat);
}
/*
* Save the current state of the match - the position in the input
* text as well as the position in the bytecode. The state of any
* parent expressions is also saved (preceding state).
* Contents of parenCount parentheses from parenIndex are also saved.
*/
static REBackTrackData *
PushBackTrackState(REGlobalData *gData, REOp op,
jsbytecode *target, REMatchState *x, const jschar *cp,
size_t parenIndex, size_t parenCount)
{
size_t i;
REBackTrackData *result =
(REBackTrackData *) ((char *)gData->backTrackSP + gData->cursz);
size_t sz = sizeof(REBackTrackData) +
gData->stateStackTop * sizeof(REProgState) +
parenCount * sizeof(RECapture);
ptrdiff_t btsize = gData->backTrackStackSize;
ptrdiff_t btincr = ((char *)result + sz) -
((char *)gData->backTrackStack + btsize);
if (btincr > 0) {
ptrdiff_t offset = (char *)result - (char *)gData->backTrackStack;
btincr = JS_ROUNDUP(btincr, btsize);
JS_ARENA_GROW_CAST(gData->backTrackStack, REBackTrackData *,
&gData->pool, btsize, btincr);
if (!gData->backTrackStack) {
JS_ReportOutOfMemory(gData->cx);
gData->ok = JS_FALSE;
return NULL;
}
gData->backTrackStackSize = btsize + btincr;
result = (REBackTrackData *) ((char *)gData->backTrackStack + offset);
}
gData->backTrackSP = result;
result->sz = gData->cursz;
gData->cursz = sz;
result->backtrack_op = op;
result->backtrack_pc = target;
result->cp = cp;
result->parenCount = parenCount;
result->saveStateStackTop = gData->stateStackTop;
JS_ASSERT(gData->stateStackTop);
memcpy(result + 1, gData->stateStack,
sizeof(REProgState) * result->saveStateStackTop);
if (parenCount != 0) {
result->parenIndex = parenIndex;
memcpy((char *)(result + 1) +
sizeof(REProgState) * result->saveStateStackTop,
&x->parens[parenIndex],
sizeof(RECapture) * parenCount);
for (i = 0; i != parenCount; i++)
x->parens[parenIndex + i].index = -1;
}
return result;
}
/*
* Consecutive literal characters.
*/
#if 0
static REMatchState *
FlatNMatcher(REGlobalData *gData, REMatchState *x, jschar *matchChars,
size_t length)
{
size_t i;
if (length > gData->cpend - x->cp)
return NULL;
for (i = 0; i != length; i++) {
if (matchChars[i] != x->cp[i])
return NULL;
}
x->cp += length;
return x;
}
#endif
static REMatchState *
FlatNIMatcher(REGlobalData *gData, REMatchState *x, jschar *matchChars,
size_t length)
{
size_t i;
JS_ASSERT(gData->cpend >= x->cp);
if (length > (size_t)(gData->cpend - x->cp))
return NULL;
for (i = 0; i != length; i++) {
if (upcase(matchChars[i]) != upcase(x->cp[i]))
return NULL;
}
x->cp += length;
return x;
}
/*
* 1. Evaluate DecimalEscape to obtain an EscapeValue E.
* 2. If E is not a character then go to step 6.
* 3. Let ch be E's character.
* 4. Let A be a one-element RECharSet containing the character ch.
* 5. Call CharacterSetMatcher(A, false) and return its Matcher result.
* 6. E must be an integer. Let n be that integer.
* 7. If n=0 or n>NCapturingParens then throw a SyntaxError exception.
* 8. Return an internal Matcher closure that takes two arguments, a State x
* and a Continuation c, and performs the following:
* 1. Let cap be x's captures internal array.
* 2. Let s be cap[n].
* 3. If s is undefined, then call c(x) and return its result.
* 4. Let e be x's endIndex.
* 5. Let len be s's length.
* 6. Let f be e+len.
* 7. If f>InputLength, return failure.
* 8. If there exists an integer i between 0 (inclusive) and len (exclusive)
* such that Canonicalize(s[i]) is not the same character as
* Canonicalize(Input [e+i]), then return failure.
* 9. Let y be the State (f, cap).
* 10. Call c(y) and return its result.
*/
static REMatchState *
BackrefMatcher(REGlobalData *gData, REMatchState *x, size_t parenIndex)
{
size_t len, i;
const jschar *parenContent;
RECapture *cap = &x->parens[parenIndex];
if (cap->index == -1)
return x;
len = cap->length;
if (x->cp + len > gData->cpend)
return NULL;
parenContent = &gData->cpbegin[cap->index];
if (gData->regexp->flags & JSREG_FOLD) {
for (i = 0; i < len; i++) {
if (upcase(parenContent[i]) != upcase(x->cp[i]))
return NULL;
}
} else {
for (i = 0; i < len; i++) {
if (parenContent[i] != x->cp[i])
return NULL;
}
}
x->cp += len;
return x;
}
/* Add a single character to the RECharSet */
static void
AddCharacterToCharSet(RECharSet *cs, jschar c)
{
uintN byteIndex = (uintN)(c >> 3);
JS_ASSERT(c <= cs->length);
cs->u.bits[byteIndex] |= 1 << (c & 0x7);
}
/* Add a character range, c1 to c2 (inclusive) to the RECharSet */
static void
AddCharacterRangeToCharSet(RECharSet *cs, jschar c1, jschar c2)
{
uintN i;
uintN byteIndex1 = (uintN)(c1 >> 3);
uintN byteIndex2 = (uintN)(c2 >> 3);
JS_ASSERT((c2 <= cs->length) && (c1 <= c2));
c1 &= 0x7;
c2 &= 0x7;
if (byteIndex1 == byteIndex2) {
cs->u.bits[byteIndex1] |= ((uint8)0xFF >> (7 - (c2 - c1))) << c1;
} else {
cs->u.bits[byteIndex1] |= 0xFF << c1;
for (i = byteIndex1 + 1; i < byteIndex2; i++)
cs->u.bits[i] = 0xFF;
cs->u.bits[byteIndex2] |= (uint8)0xFF >> (7 - c2);
}
}
/* Compile the source of the class into a RECharSet */
static JSBool
ProcessCharSet(REGlobalData *gData, RECharSet *charSet)
{
const jschar *src, *end;
JSBool inRange = JS_FALSE;
jschar rangeStart = 0;
uintN byteLength, n;
jschar c, thisCh;
intN nDigits, i;
JS_ASSERT(!charSet->converted);
/*
* Assert that startIndex and length points to chars inside [] inside
* source string.
*/
JS_ASSERT(1 <= charSet->u.src.startIndex);
JS_ASSERT(charSet->u.src.startIndex
< JSSTRING_LENGTH(gData->regexp->source));
JS_ASSERT(charSet->u.src.length <= JSSTRING_LENGTH(gData->regexp->source)
- 1 - charSet->u.src.startIndex);
charSet->converted = JS_TRUE;
src = JSSTRING_CHARS(gData->regexp->source) + charSet->u.src.startIndex;
end = src + charSet->u.src.length;
JS_ASSERT(src[-1] == '[');
JS_ASSERT(end[0] == ']');
byteLength = (charSet->length >> 3) + 1;
charSet->u.bits = (uint8 *)JS_malloc(gData->cx, byteLength);
if (!charSet->u.bits) {
JS_ReportOutOfMemory(gData->cx);
gData->ok = JS_FALSE;
return JS_FALSE;
}
memset(charSet->u.bits, 0, byteLength);
if (src == end)
return JS_TRUE;
if (*src == '^') {
JS_ASSERT(charSet->sense == JS_FALSE);
++src;
} else {
JS_ASSERT(charSet->sense == JS_TRUE);
}
while (src != end) {
switch (*src) {
case '\\':
++src;
c = *src++;
switch (c) {
case 'b':
thisCh = 0x8;
break;
case 'f':
thisCh = 0xC;
break;
case 'n':
thisCh = 0xA;
break;
case 'r':
thisCh = 0xD;
break;
case 't':
thisCh = 0x9;
break;
case 'v':
thisCh = 0xB;
break;
case 'c':
if (src < end && JS_ISWORD(*src)) {
thisCh = (jschar)(*src++ & 0x1F);
} else {
--src;
thisCh = '\\';
}
break;
case 'x':
nDigits = 2;
goto lexHex;
case 'u':
nDigits = 4;
lexHex:
n = 0;
for (i = 0; (i < nDigits) && (src < end); i++) {
uintN digit;
c = *src++;
if (!isASCIIHexDigit(c, &digit)) {
/*
* Back off to accepting the original '\'
* as a literal
*/
src -= i + 1;
n = '\\';
break;
}
n = (n << 4) | digit;
}
thisCh = (jschar)n;
break;
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
/*
* This is a non-ECMA extension - decimal escapes (in this
* case, octal!) are supposed to be an error inside class
* ranges, but supported here for backwards compatibility.
*/
n = JS7_UNDEC(c);
c = *src;
if ('0' <= c && c <= '7') {
src++;
n = 8 * n + JS7_UNDEC(c);
c = *src;
if ('0' <= c && c <= '7') {
src++;
i = 8 * n + JS7_UNDEC(c);
if (i <= 0377)
n = i;
else
src--;
}
}
thisCh = (jschar)n;
break;
case 'd':
AddCharacterRangeToCharSet(charSet, '0', '9');
continue; /* don't need range processing */
case 'D':
AddCharacterRangeToCharSet(charSet, 0, '0' - 1);
AddCharacterRangeToCharSet(charSet,
(jschar)('9' + 1),
(jschar)charSet->length);
continue;
case 's':
for (i = (intN)charSet->length; i >= 0; i--)
if (JS_ISSPACE(i))
AddCharacterToCharSet(charSet, (jschar)i);
continue;
case 'S':
for (i = (intN)charSet->length; i >= 0; i--)
if (!JS_ISSPACE(i))
AddCharacterToCharSet(charSet, (jschar)i);
continue;
case 'w':
for (i = (intN)charSet->length; i >= 0; i--)
if (JS_ISWORD(i))
AddCharacterToCharSet(charSet, (jschar)i);
continue;
case 'W':
for (i = (intN)charSet->length; i >= 0; i--)
if (!JS_ISWORD(i))
AddCharacterToCharSet(charSet, (jschar)i);
continue;
default:
thisCh = c;
break;
}
break;
default:
thisCh = *src++;
break;
}
if (inRange) {
if (gData->regexp->flags & JSREG_FOLD) {
AddCharacterRangeToCharSet(charSet, upcase(rangeStart),
upcase(thisCh));
AddCharacterRangeToCharSet(charSet, downcase(rangeStart),
downcase(thisCh));
} else {
AddCharacterRangeToCharSet(charSet, rangeStart, thisCh);
}
inRange = JS_FALSE;
} else {
if (gData->regexp->flags & JSREG_FOLD) {
AddCharacterToCharSet(charSet, upcase(thisCh));
AddCharacterToCharSet(charSet, downcase(thisCh));
} else {
AddCharacterToCharSet(charSet, thisCh);
}
if (src < end - 1) {
if (*src == '-') {
++src;
inRange = JS_TRUE;
rangeStart = thisCh;
}
}
}
}
return JS_TRUE;
}
void
js_DestroyRegExp(JSContext *cx, JSRegExp *re)
{
if (JS_ATOMIC_DECREMENT(&re->nrefs) == 0) {
if (re->classList) {
uintN i;
for (i = 0; i < re->classCount; i++) {
if (re->classList[i].converted)
JS_free(cx, re->classList[i].u.bits);
re->classList[i].u.bits = NULL;
}
JS_free(cx, re->classList);
}
JS_free(cx, re);
}
}
static JSBool
ReallocStateStack(REGlobalData *gData)
{
size_t limit = gData->stateStackLimit;
size_t sz = sizeof(REProgState) * limit;
JS_ARENA_GROW_CAST(gData->stateStack, REProgState *, &gData->pool, sz, sz);
if (!gData->stateStack) {
gData->ok = JS_FALSE;
return JS_FALSE;
}
gData->stateStackLimit = limit + limit;
return JS_TRUE;
}
#define PUSH_STATE_STACK(data) \
JS_BEGIN_MACRO \
++(data)->stateStackTop; \
if ((data)->stateStackTop == (data)->stateStackLimit && \
!ReallocStateStack((data))) { \
return NULL; \
} \
JS_END_MACRO
/*
* Apply the current op against the given input to see if it's going to match
* or fail. Return false if we don't get a match, true if we do. If updatecp is
* true, then update the current state's cp. Always update startpc to the next
* op.
*/
static REMatchState *
SimpleMatch(REGlobalData *gData, REMatchState *x, REOp op,
jsbytecode **startpc, JSBool updatecp)
{
REMatchState *result = NULL;
jschar matchCh;
size_t parenIndex;
size_t offset, length, index;
jsbytecode *pc = *startpc; /* pc has already been incremented past op */
jschar *source;
const jschar *startcp = x->cp;
jschar ch;
RECharSet *charSet;
switch (op) {
case REOP_BOL:
if (x->cp != gData->cpbegin) {
if (!gData->cx->regExpStatics.multiline &&
!(gData->regexp->flags & JSREG_MULTILINE)) {
break;
}
if (!RE_IS_LINE_TERM(x->cp[-1]))
break;
}
result = x;
break;
case REOP_EOL:
if (x->cp != gData->cpend) {
if (!gData->cx->regExpStatics.multiline &&
!(gData->regexp->flags & JSREG_MULTILINE)) {
break;
}
if (!RE_IS_LINE_TERM(*x->cp))
break;
}
result = x;
break;
case REOP_WBDRY:
if ((x->cp == gData->cpbegin || !JS_ISWORD(x->cp[-1])) ^
!(x->cp != gData->cpend && JS_ISWORD(*x->cp))) {
result = x;
}
break;
case REOP_WNONBDRY:
if ((x->cp == gData->cpbegin || !JS_ISWORD(x->cp[-1])) ^
(x->cp != gData->cpend && JS_ISWORD(*x->cp))) {
result = x;
}
break;
case REOP_DOT:
if (x->cp != gData->cpend && !RE_IS_LINE_TERM(*x->cp)) {
result = x;
result->cp++;
}
break;
case REOP_DIGIT:
if (x->cp != gData->cpend && JS_ISDIGIT(*x->cp)) {
result = x;
result->cp++;
}
break;
case REOP_NONDIGIT:
if (x->cp != gData->cpend && !JS_ISDIGIT(*x->cp)) {
result = x;
result->cp++;
}
break;
case REOP_ALNUM:
if (x->cp != gData->cpend && JS_ISWORD(*x->cp)) {
result = x;
result->cp++;
}
break;
case REOP_NONALNUM:
if (x->cp != gData->cpend && !JS_ISWORD(*x->cp)) {
result = x;
result->cp++;
}
break;
case REOP_SPACE:
if (x->cp != gData->cpend && JS_ISSPACE(*x->cp)) {
result = x;
result->cp++;
}
break;
case REOP_NONSPACE:
if (x->cp != gData->cpend && !JS_ISSPACE(*x->cp)) {
result = x;
result->cp++;
}
break;
case REOP_BACKREF:
pc = ReadCompactIndex(pc, &parenIndex);
JS_ASSERT(parenIndex < gData->regexp->parenCount);
result = BackrefMatcher(gData, x, parenIndex);
break;
case REOP_FLAT:
pc = ReadCompactIndex(pc, &offset);
JS_ASSERT(offset < JSSTRING_LENGTH(gData->regexp->source));
pc = ReadCompactIndex(pc, &length);
JS_ASSERT(1 <= length);
JS_ASSERT(length <= JSSTRING_LENGTH(gData->regexp->source) - offset);
if (length <= (size_t)(gData->cpend - x->cp)) {
source = JSSTRING_CHARS(gData->regexp->source) + offset;
for (index = 0; index != length; index++) {
if (source[index] != x->cp[index])
return NULL;
}
x->cp += length;
result = x;
}
break;
case REOP_FLAT1:
matchCh = *pc++;
if (x->cp != gData->cpend && *x->cp == matchCh) {
result = x;
result->cp++;
}
break;
case REOP_FLATi:
pc = ReadCompactIndex(pc, &offset);
JS_ASSERT(offset < JSSTRING_LENGTH(gData->regexp->source));
pc = ReadCompactIndex(pc, &length);
JS_ASSERT(1 <= length);
JS_ASSERT(length <= JSSTRING_LENGTH(gData->regexp->source) - offset);
source = JSSTRING_CHARS(gData->regexp->source);
result = FlatNIMatcher(gData, x, source + offset, length);
break;
case REOP_FLAT1i:
matchCh = *pc++;
if (x->cp != gData->cpend && upcase(*x->cp) == upcase(matchCh)) {
result = x;
result->cp++;
}
break;
case REOP_UCFLAT1:
matchCh = GET_ARG(pc);
pc += ARG_LEN;
if (x->cp != gData->cpend && *x->cp == matchCh) {
result = x;
result->cp++;
}
break;
case REOP_UCFLAT1i:
matchCh = GET_ARG(pc);
pc += ARG_LEN;
if (x->cp != gData->cpend && upcase(*x->cp) == upcase(matchCh)) {
result = x;
result->cp++;
}
break;
case REOP_CLASS:
pc = ReadCompactIndex(pc, &index);
JS_ASSERT(index < gData->regexp->classCount);
if (x->cp != gData->cpend) {
charSet = &gData->regexp->classList[index];
JS_ASSERT(charSet->converted);
ch = *x->cp;
index = ch >> 3;
if (charSet->length != 0 &&
ch <= charSet->length &&
(charSet->u.bits[index] & (1 << (ch & 0x7)))) {
result = x;
result->cp++;
}
}
break;
case REOP_NCLASS:
pc = ReadCompactIndex(pc, &index);
JS_ASSERT(index < gData->regexp->classCount);
if (x->cp != gData->cpend) {
charSet = &gData->regexp->classList[index];
JS_ASSERT(charSet->converted);
ch = *x->cp;
index = ch >> 3;
if (charSet->length == 0 ||
ch > charSet->length ||
!(charSet->u.bits[index] & (1 << (ch & 0x7)))) {
result = x;
result->cp++;
}
}
break;
default:
JS_ASSERT(JS_FALSE);
}
if (result) {
if (!updatecp)
x->cp = startcp;
*startpc = pc;
return result;
}
x->cp = startcp;
return NULL;
}
static REMatchState *
ExecuteREBytecode(REGlobalData *gData, REMatchState *x)
{
REMatchState *result = NULL;
REBackTrackData *backTrackData;
jsbytecode *nextpc, *testpc;
REOp nextop;
RECapture *cap;
REProgState *curState=NULL;
const jschar *startcp;
size_t parenIndex, k;
size_t parenSoFar = 0;
jschar matchCh1, matchCh2;
RECharSet *charSet;
JSBranchCallback onbranch = gData->cx->branchCallback;
uintN onbranchCalls = 0;
#define ONBRANCH_CALLS_MASK 127
#define CHECK_BRANCH() \
JS_BEGIN_MACRO \
if (onbranch && \
(++onbranchCalls & ONBRANCH_CALLS_MASK) == 0 && \
!(*onbranch)(gData->cx, NULL)) { \
gData->ok = JS_FALSE; \
return NULL; \
} \
JS_END_MACRO
JSBool anchor;
jsbytecode *pc = gData->regexp->program;
REOp op = (REOp) *pc++;
/*
* If the first node is a simple match, step the index into the string
* until that match is made, or fail if it can't be found at all.
*/
if (REOP_IS_SIMPLE(op)) {
anchor = JS_FALSE;
while (x->cp <= gData->cpend) {
nextpc = pc; /* reset back to start each time */
result = SimpleMatch(gData, x, op, &nextpc, JS_TRUE);
if (result) {
anchor = JS_TRUE;
x = result;
pc = nextpc; /* accept skip to next opcode */
op = (REOp) *pc++;
break;
}
gData->skipped++;
x->cp++;
}
if (!anchor)
return NULL;
}
for (;;) {
if (REOP_IS_SIMPLE(op)) {
result = SimpleMatch(gData, x, op, &pc, JS_TRUE);
} else {
curState = &gData->stateStack[gData->stateStackTop];
switch (op) {
case REOP_EMPTY:
result = x;
break;
case REOP_ALTPREREQ2:
nextpc = pc + GET_OFFSET(pc); /* start of next op */
pc += ARG_LEN;
matchCh2 = GET_ARG(pc);
pc += ARG_LEN;
k = GET_ARG(pc);
pc += ARG_LEN;
if (x->cp != gData->cpend) {
if (*x->cp == matchCh2)
goto doAlt;
charSet = &gData->regexp->classList[k];
if (!charSet->converted && !ProcessCharSet(gData, charSet))
return NULL;
matchCh1 = *x->cp;
k = matchCh1 >> 3;
if ((charSet->length == 0 ||
matchCh1 > charSet->length ||
!(charSet->u.bits[k] & (1 << (matchCh1 & 0x7)))) ^
charSet->sense) {
goto doAlt;
}
}
result = NULL;
break;
case REOP_ALTPREREQ:
nextpc = pc + GET_OFFSET(pc); /* start of next op */
pc += ARG_LEN;
matchCh1 = GET_ARG(pc);
pc += ARG_LEN;
matchCh2 = GET_ARG(pc);
pc += ARG_LEN;
if (x->cp == gData->cpend ||
(*x->cp != matchCh1 && *x->cp != matchCh2)) {
result = NULL;
break;
}
/* else false thru... */
case REOP_ALT:
doAlt:
nextpc = pc + GET_OFFSET(pc); /* start of next alternate */
pc += ARG_LEN; /* start of this alternate */
curState->parenSoFar = parenSoFar;
PUSH_STATE_STACK(gData);
op = (REOp) *pc++;
startcp = x->cp;
if (REOP_IS_SIMPLE(op)) {
if (!SimpleMatch(gData, x, op, &pc, JS_TRUE)) {
op = (REOp) *nextpc++;
pc = nextpc;
continue;
}
result = x;
op = (REOp) *pc++;
}
nextop = (REOp) *nextpc++;
if (!PushBackTrackState(gData, nextop, nextpc, x, startcp, 0, 0))
return NULL;
continue;
/*
* Occurs at (successful) end of REOP_ALT,
*/
case REOP_JUMP:
if(gData->stateStackTop)
--gData->stateStackTop;
pc += GET_OFFSET(pc);
op = (REOp) *pc++;
continue;
/*
* Occurs at last (successful) end of REOP_ALT,
*/
case REOP_ENDALT:
if(gData->stateStackTop)
--gData->stateStackTop;
op = (REOp) *pc++;
continue;
case REOP_LPAREN:
pc = ReadCompactIndex(pc, &parenIndex);
JS_ASSERT(parenIndex < gData->regexp->parenCount);
if (parenIndex + 1 > parenSoFar)
parenSoFar = parenIndex + 1;
x->parens[parenIndex].index = x->cp - gData->cpbegin;
x->parens[parenIndex].length = 0;
op = (REOp) *pc++;
continue;
case REOP_RPAREN:
pc = ReadCompactIndex(pc, &parenIndex);
JS_ASSERT(parenIndex < gData->regexp->parenCount);
cap = &x->parens[parenIndex];
/*
* FIXME: https://bugzilla.mozilla.org/show_bug.cgi?id=346090
* This wallpaper prevents a case where we somehow took a step
* backward in input while minimally-matching an empty string.
*/
if (x->cp < gData->cpbegin + cap->index)
cap->index = -1;
cap->length = x->cp - (gData->cpbegin + cap->index);
op = (REOp) *pc++;
continue;
case REOP_ASSERT:
nextpc = pc + GET_OFFSET(pc); /* start of term after ASSERT */
pc += ARG_LEN; /* start of ASSERT child */
op = (REOp) *pc++;
testpc = pc;
if (REOP_IS_SIMPLE(op) &&
!SimpleMatch(gData, x, op, &testpc, JS_FALSE)) {
result = NULL;
break;
}
curState->u.assertion.top =
(char *)gData->backTrackSP - (char *)gData->backTrackStack;
curState->u.assertion.sz = gData->cursz;
curState->index = x->cp - gData->cpbegin;
curState->parenSoFar = parenSoFar;
PUSH_STATE_STACK(gData);
if (!PushBackTrackState(gData, REOP_ASSERTTEST,
nextpc, x, x->cp, 0, 0)) {
return NULL;
}
continue;
case REOP_ASSERT_NOT:
nextpc = pc + GET_OFFSET(pc);
pc += ARG_LEN;
op = (REOp) *pc++;
testpc = pc;
if (REOP_IS_SIMPLE(op) /* Note - fail to fail! */ &&
SimpleMatch(gData, x, op, &testpc, JS_FALSE) &&
*testpc == REOP_ASSERTNOTTEST) {
result = NULL;
break;
}
curState->u.assertion.top
= (char *)gData->backTrackSP -
(char *)gData->backTrackStack;
curState->u.assertion.sz = gData->cursz;
curState->index = x->cp - gData->cpbegin;
curState->parenSoFar = parenSoFar;
PUSH_STATE_STACK(gData);
if (!PushBackTrackState(gData, REOP_ASSERTNOTTEST,
nextpc, x, x->cp, 0, 0)) {
return NULL;
}
continue;
case REOP_ASSERTTEST:
if(gData->stateStackTop)
--gData->stateStackTop;
--curState;
x->cp = gData->cpbegin + curState->index;
gData->backTrackSP =
(REBackTrackData *) ((char *)gData->backTrackStack +
curState->u.assertion.top);
gData->cursz = curState->u.assertion.sz;
if (result)
result = x;
break;
case REOP_ASSERTNOTTEST:
if(gData->stateStackTop)
--gData->stateStackTop;
--curState;
x->cp = gData->cpbegin + curState->index;
gData->backTrackSP =
(REBackTrackData *) ((char *)gData->backTrackStack +
curState->u.assertion.top);
gData->cursz = curState->u.assertion.sz;
result = (!result) ? x : NULL;
break;
case REOP_END:
if (x)
return x;
break;
case REOP_STAR:
curState->u.quantifier.min = 0;
curState->u.quantifier.max = (uintN)-1;
goto quantcommon;
case REOP_PLUS:
curState->u.quantifier.min = 1;
curState->u.quantifier.max = (uintN)-1;
goto quantcommon;
case REOP_OPT:
curState->u.quantifier.min = 0;
curState->u.quantifier.max = 1;
goto quantcommon;
case REOP_QUANT:
pc = ReadCompactIndex(pc, &k);
curState->u.quantifier.min = k;
pc = ReadCompactIndex(pc, &k);
/* max is k - 1 to use one byte for (uintN)-1 sentinel. */
curState->u.quantifier.max = k - 1;
JS_ASSERT(curState->u.quantifier.min
<= curState->u.quantifier.max);
quantcommon:
if (curState->u.quantifier.max == 0) {
pc = pc + GET_OFFSET(pc);
op = (REOp) *pc++;
result = x;
continue;
}
/* Step over <next> */
nextpc = pc + ARG_LEN;
op = (REOp) *nextpc++;
startcp = x->cp;
if (REOP_IS_SIMPLE(op)) {
if (!SimpleMatch(gData, x, op, &nextpc, JS_TRUE)) {
if (curState->u.quantifier.min == 0)
result = x;
else
result = NULL;
pc = pc + GET_OFFSET(pc);
break;
}
op = (REOp) *nextpc++;
result = x;
}
curState->index = startcp - gData->cpbegin;
curState->continue_op = REOP_REPEAT;
curState->continue_pc = pc;
curState->parenSoFar = parenSoFar;
PUSH_STATE_STACK(gData);
if (curState->u.quantifier.min == 0 &&
!PushBackTrackState(gData, REOP_REPEAT, pc, x, startcp,
0, 0)) {
return NULL;
}
pc = nextpc;
continue;
case REOP_ENDCHILD: /* marks the end of a quantifier child */
pc = curState[-1].continue_pc;
op = curState[-1].continue_op;
continue;
case REOP_REPEAT:
CHECK_BRANCH();
--curState;
do {
if(gData->stateStackTop)
--gData->stateStackTop;
if (!result) {
/* Failed, see if we have enough children. */
if (curState->u.quantifier.min == 0)
goto repeatDone;
goto break_switch;
}
if (curState->u.quantifier.min == 0 &&
x->cp == gData->cpbegin + curState->index) {
/* matched an empty string, that'll get us nowhere */
result = NULL;
goto break_switch;
}
if (curState->u.quantifier.min != 0)
curState->u.quantifier.min--;
if (curState->u.quantifier.max != (uintN) -1)
curState->u.quantifier.max--;
if (curState->u.quantifier.max == 0)
goto repeatDone;
nextpc = pc + ARG_LEN;
nextop = (REOp) *nextpc;
startcp = x->cp;
if (REOP_IS_SIMPLE(nextop)) {
nextpc++;
if (!SimpleMatch(gData, x, nextop, &nextpc, JS_TRUE)) {
if (curState->u.quantifier.min == 0)
goto repeatDone;
result = NULL;
goto break_switch;
}
result = x;
}
curState->index = startcp - gData->cpbegin;
PUSH_STATE_STACK(gData);
if (curState->u.quantifier.min == 0 &&
!PushBackTrackState(gData, REOP_REPEAT,
pc, x, startcp,
curState->parenSoFar,
parenSoFar -
curState->parenSoFar)) {
return NULL;
}
} while (*nextpc == REOP_ENDCHILD);
pc = nextpc;
op = (REOp) *pc++;
parenSoFar = curState->parenSoFar;
continue;
repeatDone:
result = x;
pc += GET_OFFSET(pc);
goto break_switch;
case REOP_MINIMALSTAR:
curState->u.quantifier.min = 0;
curState->u.quantifier.max = (uintN)-1;
goto minimalquantcommon;
case REOP_MINIMALPLUS:
curState->u.quantifier.min = 1;
curState->u.quantifier.max = (uintN)-1;
goto minimalquantcommon;
case REOP_MINIMALOPT:
curState->u.quantifier.min = 0;
curState->u.quantifier.max = 1;
goto minimalquantcommon;
case REOP_MINIMALQUANT:
pc = ReadCompactIndex(pc, &k);
curState->u.quantifier.min = k;
pc = ReadCompactIndex(pc, &k);
/* See REOP_QUANT comments about k - 1. */
curState->u.quantifier.max = k - 1;
JS_ASSERT(curState->u.quantifier.min
<= curState->u.quantifier.max);
minimalquantcommon:
curState->index = x->cp - gData->cpbegin;
curState->parenSoFar = parenSoFar;
PUSH_STATE_STACK(gData);
if (curState->u.quantifier.min != 0) {
curState->continue_op = REOP_MINIMALREPEAT;
curState->continue_pc = pc;
/* step over <next> */
pc += OFFSET_LEN;
op = (REOp) *pc++;
} else {
if (!PushBackTrackState(gData, REOP_MINIMALREPEAT,
pc, x, x->cp, 0, 0)) {
return NULL;
}
if(gData->stateStackTop)
--gData->stateStackTop;
pc = pc + GET_OFFSET(pc);
op = (REOp) *pc++;
}
continue;
case REOP_MINIMALREPEAT:
CHECK_BRANCH();
if(gData->stateStackTop)
--gData->stateStackTop;
--curState;
if (!result) {
/*
* Non-greedy failure - try to consume another child.
*/
if (curState->u.quantifier.max == (uintN) -1 ||
curState->u.quantifier.max > 0) {
curState->index = x->cp - gData->cpbegin;
curState->continue_op = REOP_MINIMALREPEAT;
curState->continue_pc = pc;
pc += ARG_LEN;
for (k = curState->parenSoFar; k < parenSoFar; k++)
x->parens[k].index = -1;
PUSH_STATE_STACK(gData);
op = (REOp) *pc++;
continue;
}
/* Don't need to adjust pc since we're going to pop. */
break;
}
if (curState->u.quantifier.min == 0 &&
x->cp == gData->cpbegin + curState->index) {
/* Matched an empty string, that'll get us nowhere. */
result = NULL;
break;
}
if (curState->u.quantifier.min != 0)
curState->u.quantifier.min--;
if (curState->u.quantifier.max != (uintN) -1)
curState->u.quantifier.max--;
if (curState->u.quantifier.min != 0) {
curState->continue_op = REOP_MINIMALREPEAT;
curState->continue_pc = pc;
pc += ARG_LEN;
for (k = curState->parenSoFar; k < parenSoFar; k++)
x->parens[k].index = -1;
curState->index = x->cp - gData->cpbegin;
PUSH_STATE_STACK(gData);
op = (REOp) *pc++;
continue;
}
curState->index = x->cp - gData->cpbegin;
curState->parenSoFar = parenSoFar;
PUSH_STATE_STACK(gData);
if (!PushBackTrackState(gData, REOP_MINIMALREPEAT,
pc, x, x->cp,
curState->parenSoFar,
parenSoFar - curState->parenSoFar)) {
return NULL;
}
if(gData->stateStackTop)
--gData->stateStackTop;
pc = pc + GET_OFFSET(pc);
op = (REOp) *pc++;
continue;
default:
JS_ASSERT(JS_FALSE);
result = NULL;
}
break_switch:;
}
/*
* If the match failed and there's a backtrack option, take it.
* Otherwise this is a complete and utter failure.
*/
if (!result) {
if (gData->cursz == 0)
return NULL;
backTrackData = gData->backTrackSP;
gData->cursz = backTrackData->sz;
gData->backTrackSP =
(REBackTrackData *) ((char *)backTrackData - backTrackData->sz);
x->cp = backTrackData->cp;
pc = backTrackData->backtrack_pc;
op = backTrackData->backtrack_op;
gData->stateStackTop = backTrackData->saveStateStackTop;
JS_ASSERT(gData->stateStackTop);
memcpy(gData->stateStack, backTrackData + 1,
sizeof(REProgState) * backTrackData->saveStateStackTop);
curState = &gData->stateStack[gData->stateStackTop - 1];
if (backTrackData->parenCount) {
memcpy(&x->parens[backTrackData->parenIndex],
(char *)(backTrackData + 1) +
sizeof(REProgState) * backTrackData->saveStateStackTop,
sizeof(RECapture) * backTrackData->parenCount);
parenSoFar = backTrackData->parenIndex + backTrackData->parenCount;
} else {
for (k = curState->parenSoFar; k < parenSoFar; k++)
x->parens[k].index = -1;
parenSoFar = curState->parenSoFar;
}
continue;
}
x = result;
/*
* Continue with the expression.
*/
op = (REOp)*pc++;
}
return NULL;
}
static REMatchState *
MatchRegExp(REGlobalData *gData, REMatchState *x)
{
REMatchState *result;
const jschar *cp = x->cp;
const jschar *cp2;
uintN j;
/*
* Have to include the position beyond the last character
* in order to detect end-of-input/line condition.
*/
for (cp2 = cp; cp2 <= gData->cpend; cp2++) {
gData->skipped = cp2 - cp;
x->cp = cp2;
for (j = 0; j < gData->regexp->parenCount; j++)
x->parens[j].index = -1;
result = ExecuteREBytecode(gData, x);
if (!gData->ok || result)
return result;
gData->backTrackSP = gData->backTrackStack;
gData->cursz = 0;
gData->stateStackTop = 0;
cp2 = cp + gData->skipped;
}
return NULL;
}
static REMatchState *
InitMatch(JSContext *cx, REGlobalData *gData, JSRegExp *re)
{
REMatchState *result;
uintN i;
gData->backTrackStackSize = INITIAL_BACKTRACK;
JS_ARENA_ALLOCATE_CAST(gData->backTrackStack, REBackTrackData *,
&gData->pool,
INITIAL_BACKTRACK);
if (!gData->backTrackStack)
goto bad;
gData->backTrackSP = gData->backTrackStack;
gData->cursz = 0;
gData->stateStackLimit = INITIAL_STATESTACK;
JS_ARENA_ALLOCATE_CAST(gData->stateStack, REProgState *,
&gData->pool,
sizeof(REProgState) * INITIAL_STATESTACK);
if (!gData->stateStack)
goto bad;
gData->stateStackTop = 0;
gData->cx = cx;
gData->regexp = re;
gData->ok = JS_TRUE;
JS_ARENA_ALLOCATE_CAST(result, REMatchState *,
&gData->pool,
offsetof(REMatchState, parens)
+ re->parenCount * sizeof(RECapture));
if (!result)
goto bad;
for (i = 0; i < re->classCount; i++) {
if (!re->classList[i].converted &&
!ProcessCharSet(gData, &re->classList[i])) {
return NULL;
}
}
return result;
bad:
JS_ReportOutOfMemory(cx);
gData->ok = JS_FALSE;
return NULL;
}
void
js_RegExpStatics_clear(JSContext *cx, JSRegExpStatics *res)
{
res->input = NULL;
res->pendingInput = NULL;
res->multiline = JS_FALSE;
res->parenCount = 0;
res->lastMatch = res->lastParen = js_EmptySubString;
res->leftContext = res->rightContext = js_EmptySubString;
if (res->moreParens) {
JS_free(cx, res->moreParens);
res->moreParens = NULL;
}
}
JSBool
js_ExecuteRegExp(JSContext *cx, JSRegExp *re, JSString *str, size_t *indexp,
JSBool test, jsval *rval)
{
REGlobalData gData;
REMatchState *x, *result;
const jschar *cp, *ep;
size_t i, length, start;
JSSubString *morepar;
JSBool ok;
JSRegExpStatics *res;
ptrdiff_t matchlen;
uintN num, morenum;
JSString *parstr, *matchstr;
JSObject *obj;
RECapture *parsub = NULL;
/*
* It's safe to load from cp because JSStrings have a zero at the end,
* and we never let cp get beyond cpend.
*/
start = *indexp;
length = JSSTRING_LENGTH(str);
if (start > length)
start = length;
cp = JSSTRING_CHARS(str);
gData.cpbegin = cp;
gData.cpend = cp + length;
cp += start;
gData.start = start;
gData.skipped = 0;
JS_InitArenaPool(&gData.pool, "RegExpPool", 8096, 4);
x = InitMatch(cx, &gData, re);
if (!x) {
ok = JS_FALSE;
goto out;
}
x->cp = cp;
/*
* Call the recursive matcher to do the real work. Return null on mismatch
* whether testing or not. On match, return an extended Array object.
*/
result = MatchRegExp(&gData, x);
ok = gData.ok;
if (!ok)
goto out;
if (!result) {
*rval = JSVAL_NULL;
goto out;
}
cp = result->cp;
i = cp - gData.cpbegin;
*indexp = i;
matchlen = i - (start + gData.skipped);
ep = cp;
cp -= matchlen;
if (test) {
/*
* Testing for a match and updating cx->regExpStatics: don't allocate
* an array object, do return true.
*/
*rval = JSVAL_TRUE;
/* Avoid warning. (gcc doesn't detect that obj is needed iff !test); */
obj = NULL;
} else {
/*
* The array returned on match has element 0 bound to the matched
* string, elements 1 through state.parenCount bound to the paren
* matches, an index property telling the length of the left context,
* and an input property referring to the input string.
*/
obj = js_NewArrayObject(cx, 0, NULL);
if (!obj) {
ok = JS_FALSE;
goto out;
}
*rval = OBJECT_TO_JSVAL(obj);
#define DEFVAL(val, id) { \
ok = js_DefineProperty(cx, obj, id, val, \
JS_PropertyStub, JS_PropertyStub, \
JSPROP_ENUMERATE, NULL); \
if (!ok) { \
cx->weakRoots.newborn[GCX_OBJECT] = NULL; \
cx->weakRoots.newborn[GCX_STRING] = NULL; \
goto out; \
} \
}
matchstr = js_NewStringCopyN(cx, cp, matchlen, 0);
if (!matchstr) {
cx->weakRoots.newborn[GCX_OBJECT] = NULL;
ok = JS_FALSE;
goto out;
}
DEFVAL(STRING_TO_JSVAL(matchstr), INT_TO_JSID(0));
}
res = &cx->regExpStatics;
res->pendingInput = res->input = str;
res->parenCount = re->parenCount;
if (re->parenCount == 0) {
res->lastParen = js_EmptySubString;
} else {
for (num = 0; num < re->parenCount; num++) {
parsub = &result->parens[num];
if (num < 9) {
if (parsub->index == -1) {
res->parens[num].chars = NULL;
res->parens[num].length = 0;
} else {
res->parens[num].chars = gData.cpbegin + parsub->index;
res->parens[num].length = parsub->length;
}
} else {
morenum = num - 9;
morepar = res->moreParens;
if (!morepar) {
res->moreLength = 10;
morepar = (JSSubString*)
JS_malloc(cx, 10 * sizeof(JSSubString));
} else if (morenum >= res->moreLength) {
res->moreLength += 10;
morepar = (JSSubString*)
JS_realloc(cx, morepar,
res->moreLength * sizeof(JSSubString));
}
if (!morepar) {
cx->weakRoots.newborn[GCX_OBJECT] = NULL;
cx->weakRoots.newborn[GCX_STRING] = NULL;
ok = JS_FALSE;
goto out;
}
res->moreParens = morepar;
if (parsub->index == -1) {
morepar[morenum].chars = NULL;
morepar[morenum].length = 0;
} else {
morepar[morenum].chars = gData.cpbegin + parsub->index;
morepar[morenum].length = parsub->length;
}
}
if (test)
continue;
if (parsub->index == -1) {
ok = js_DefineProperty(cx, obj, INT_TO_JSID(num + 1),
JSVAL_VOID, NULL, NULL,
JSPROP_ENUMERATE, NULL);
} else {
parstr = js_NewStringCopyN(cx, gData.cpbegin + parsub->index,
parsub->length, 0);
if (!parstr) {
cx->weakRoots.newborn[GCX_OBJECT] = NULL;
cx->weakRoots.newborn[GCX_STRING] = NULL;
ok = JS_FALSE;
goto out;
}
ok = js_DefineProperty(cx, obj, INT_TO_JSID(num + 1),
STRING_TO_JSVAL(parstr), NULL, NULL,
JSPROP_ENUMERATE, NULL);
}
if (!ok) {
cx->weakRoots.newborn[GCX_OBJECT] = NULL;
cx->weakRoots.newborn[GCX_STRING] = NULL;
goto out;
}
}
if (parsub->index == -1) {
res->lastParen = js_EmptySubString;
} else {
res->lastParen.chars = gData.cpbegin + parsub->index;
res->lastParen.length = parsub->length;
}
}
if (!test) {
/*
* Define the index and input properties last for better for/in loop
* order (so they come after the elements).
*/
DEFVAL(INT_TO_JSVAL(start + gData.skipped),
ATOM_TO_JSID(cx->runtime->atomState.indexAtom));
DEFVAL(STRING_TO_JSVAL(str),
ATOM_TO_JSID(cx->runtime->atomState.inputAtom));
}
#undef DEFVAL
res->lastMatch.chars = cp;
res->lastMatch.length = matchlen;
/*
* For JS1.3 and ECMAv2, emulate Perl5 exactly:
*
* js1.3 "hi", "hi there" "hihitherehi therebye"
*/
res->leftContext.chars = JSSTRING_CHARS(str);
res->leftContext.length = start + gData.skipped;
res->rightContext.chars = ep;
res->rightContext.length = gData.cpend - ep;
out:
if (!ok)
js_RegExpStatics_clear(cx,res);
JS_FinishArenaPool(&gData.pool);
return ok;
}
/************************************************************************/
enum regexp_tinyid {
REGEXP_SOURCE = -1,
REGEXP_GLOBAL = -2,
REGEXP_IGNORE_CASE = -3,
REGEXP_LAST_INDEX = -4,
REGEXP_MULTILINE = -5
};
#define REGEXP_PROP_ATTRS (JSPROP_PERMANENT|JSPROP_SHARED)
static JSPropertySpec regexp_props[] = {
{"source", REGEXP_SOURCE, REGEXP_PROP_ATTRS | JSPROP_READONLY,0,0},
{"global", REGEXP_GLOBAL, REGEXP_PROP_ATTRS | JSPROP_READONLY,0,0},
{"ignoreCase", REGEXP_IGNORE_CASE, REGEXP_PROP_ATTRS | JSPROP_READONLY,0,0},
{"lastIndex", REGEXP_LAST_INDEX, REGEXP_PROP_ATTRS,0,0},
{"multiline", REGEXP_MULTILINE, REGEXP_PROP_ATTRS | JSPROP_READONLY,0,0},
{0,0,0,0,0}
};
static JSBool
regexp_getProperty(JSContext *cx, JSObject *obj, jsval id, jsval *vp)
{
jsint slot;
JSRegExp *re;
if (!JSVAL_IS_INT(id))
return JS_TRUE;
slot = JSVAL_TO_INT(id);
if (slot == REGEXP_LAST_INDEX)
return JS_GetReservedSlot(cx, obj, 0, vp);
JS_LOCK_OBJ(cx, obj);
re = (JSRegExp *) JS_GetInstancePrivate(cx, obj, &js_RegExpClass, NULL);
if (re) {
switch (slot) {
case REGEXP_SOURCE:
*vp = STRING_TO_JSVAL(re->source);
break;
case REGEXP_GLOBAL:
*vp = BOOLEAN_TO_JSVAL((re->flags & JSREG_GLOB) != 0);
break;
case REGEXP_IGNORE_CASE:
*vp = BOOLEAN_TO_JSVAL((re->flags & JSREG_FOLD) != 0);
break;
case REGEXP_MULTILINE:
*vp = BOOLEAN_TO_JSVAL((re->flags & JSREG_MULTILINE) != 0);
break;
}
}
JS_UNLOCK_OBJ(cx, obj);
return JS_TRUE;
}
static JSBool
regexp_setProperty(JSContext *cx, JSObject *obj, jsval id, jsval *vp)
{
JSBool ok;
jsint slot;
jsdouble lastIndex;
ok = JS_TRUE;
if (!JSVAL_IS_INT(id))
return ok;
slot = JSVAL_TO_INT(id);
if (slot == REGEXP_LAST_INDEX) {
if (!js_ValueToNumber(cx, *vp, &lastIndex))
return JS_FALSE;
lastIndex = js_DoubleToInteger(lastIndex);
ok = js_NewNumberValue(cx, lastIndex, vp) &&
JS_SetReservedSlot(cx, obj, 0, *vp);
}
return ok;
}
/*
* RegExp class static properties and their Perl counterparts:
*
* RegExp.input $_
* RegExp.multiline $*
* RegExp.lastMatch $&
* RegExp.lastParen $+
* RegExp.leftContext $`
* RegExp.rightContext $'
*/
enum regexp_static_tinyid {
REGEXP_STATIC_INPUT = -1,
REGEXP_STATIC_MULTILINE = -2,
REGEXP_STATIC_LAST_MATCH = -3,
REGEXP_STATIC_LAST_PAREN = -4,
REGEXP_STATIC_LEFT_CONTEXT = -5,
REGEXP_STATIC_RIGHT_CONTEXT = -6
};
JSBool
js_InitRegExpStatics(JSContext *cx, JSRegExpStatics *res)
{
JSBool in, pd;
JS_ClearRegExpStatics(cx);
in = js_AddRoot(cx, &res->input, "res->input");
pd = js_AddRoot(cx, &res->pendingInput, "res->input");
return in && pd;
}
void
js_FreeRegExpStatics(JSContext *cx, JSRegExpStatics *res)
{
if (res->moreParens) {
JS_free(cx, res->moreParens);
res->moreParens = NULL;
}
js_RemoveRoot(cx->runtime, &res->input);
js_RemoveRoot(cx->runtime, &res->pendingInput);
}
static JSBool
regexp_static_getProperty(JSContext *cx, JSObject *obj, jsval id, jsval *vp)
{
jsint slot;
JSRegExpStatics *res;
JSString *str;
JSSubString *sub;
res = &cx->regExpStatics;
if (!JSVAL_IS_INT(id))
return JS_TRUE;
slot = JSVAL_TO_INT(id);
switch (slot) {
case REGEXP_STATIC_INPUT:
*vp = res->pendingInput ? STRING_TO_JSVAL(res->pendingInput)
: JS_GetEmptyStringValue(cx);
return JS_TRUE;
case REGEXP_STATIC_MULTILINE:
*vp = BOOLEAN_TO_JSVAL(res->multiline);
return JS_TRUE;
case REGEXP_STATIC_LAST_MATCH:
sub = &res->lastMatch;
break;
case REGEXP_STATIC_LAST_PAREN:
sub = &res->lastParen;
break;
case REGEXP_STATIC_LEFT_CONTEXT:
sub = &res->leftContext;
break;
case REGEXP_STATIC_RIGHT_CONTEXT:
sub = &res->rightContext;
break;
default:
sub = REGEXP_PAREN_SUBSTRING(res, slot);
break;
}
str = js_NewStringCopyN(cx, sub->chars, sub->length, 0);
if (!str)
return JS_FALSE;
*vp = STRING_TO_JSVAL(str);
return JS_TRUE;
}
static JSBool
regexp_static_setProperty(JSContext *cx, JSObject *obj, jsval id, jsval *vp)
{
JSRegExpStatics *res;
if (!JSVAL_IS_INT(id))
return JS_TRUE;
res = &cx->regExpStatics;
/* XXX use if-else rather than switch to keep MSVC1.52 from crashing */
if (JSVAL_TO_INT(id) == REGEXP_STATIC_INPUT) {
if (!JSVAL_IS_STRING(*vp) &&
!JS_ConvertValue(cx, *vp, JSTYPE_STRING, vp)) {
return JS_FALSE;
}
res->pendingInput = JSVAL_TO_STRING(*vp);
} else if (JSVAL_TO_INT(id) == REGEXP_STATIC_MULTILINE) {
if (!JSVAL_IS_BOOLEAN(*vp) &&
!JS_ConvertValue(cx, *vp, JSTYPE_BOOLEAN, vp)) {
return JS_FALSE;
}
res->multiline = JSVAL_TO_BOOLEAN(*vp);
}
return JS_TRUE;
}
static JSPropertySpec regexp_static_props[] = {
{"input",
REGEXP_STATIC_INPUT,
JSPROP_ENUMERATE|JSPROP_SHARED,
regexp_static_getProperty, regexp_static_setProperty},
{"multiline",
REGEXP_STATIC_MULTILINE,
JSPROP_ENUMERATE|JSPROP_SHARED,
regexp_static_getProperty, regexp_static_setProperty},
{"lastMatch",
REGEXP_STATIC_LAST_MATCH,
JSPROP_ENUMERATE|JSPROP_READONLY|JSPROP_SHARED,
regexp_static_getProperty, regexp_static_getProperty},
{"lastParen",
REGEXP_STATIC_LAST_PAREN,
JSPROP_ENUMERATE|JSPROP_READONLY|JSPROP_SHARED,
regexp_static_getProperty, regexp_static_getProperty},
{"leftContext",
REGEXP_STATIC_LEFT_CONTEXT,
JSPROP_ENUMERATE|JSPROP_READONLY|JSPROP_SHARED,
regexp_static_getProperty, regexp_static_getProperty},
{"rightContext",
REGEXP_STATIC_RIGHT_CONTEXT,
JSPROP_ENUMERATE|JSPROP_READONLY|JSPROP_SHARED,
regexp_static_getProperty, regexp_static_getProperty},
/* XXX should have block scope and local $1, etc. */
{"$1", 0, JSPROP_ENUMERATE|JSPROP_READONLY|JSPROP_SHARED,
regexp_static_getProperty, regexp_static_getProperty},
{"$2", 1, JSPROP_ENUMERATE|JSPROP_READONLY|JSPROP_SHARED,
regexp_static_getProperty, regexp_static_getProperty},
{"$3", 2, JSPROP_ENUMERATE|JSPROP_READONLY|JSPROP_SHARED,
regexp_static_getProperty, regexp_static_getProperty},
{"$4", 3, JSPROP_ENUMERATE|JSPROP_READONLY|JSPROP_SHARED,
regexp_static_getProperty, regexp_static_getProperty},
{"$5", 4, JSPROP_ENUMERATE|JSPROP_READONLY|JSPROP_SHARED,
regexp_static_getProperty, regexp_static_getProperty},
{"$6", 5, JSPROP_ENUMERATE|JSPROP_READONLY|JSPROP_SHARED,
regexp_static_getProperty, regexp_static_getProperty},
{"$7", 6, JSPROP_ENUMERATE|JSPROP_READONLY|JSPROP_SHARED,
regexp_static_getProperty, regexp_static_getProperty},
{"$8", 7, JSPROP_ENUMERATE|JSPROP_READONLY|JSPROP_SHARED,
regexp_static_getProperty, regexp_static_getProperty},
{"$9", 8, JSPROP_ENUMERATE|JSPROP_READONLY|JSPROP_SHARED,
regexp_static_getProperty, regexp_static_getProperty},
{0,0,0,0,0}
};
static void
regexp_finalize(JSContext *cx, JSObject *obj)
{
JSRegExp *re;
re = (JSRegExp *) JS_GetPrivate(cx, obj);
if (!re)
return;
js_DestroyRegExp(cx, re);
}
/* Forward static prototype. */
static JSBool
regexp_exec(JSContext *cx, JSObject *obj, uintN argc, jsval *argv,
jsval *rval);
static JSBool
regexp_call(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval)
{
return regexp_exec(cx, JSVAL_TO_OBJECT(argv[-2]), argc, argv, rval);
}
#if JS_HAS_XDR
#include "jsxdrapi.h"
static JSBool
regexp_xdrObject(JSXDRState *xdr, JSObject **objp)
{
JSRegExp *re;
JSString *source;
uint32 flagsword;
JSObject *obj;
if (xdr->mode == JSXDR_ENCODE) {
re = (JSRegExp *) JS_GetPrivate(xdr->cx, *objp);
if (!re)
return JS_FALSE;
source = re->source;
flagsword = ((uint32)re->cloneIndex << 16) | re->flags;
}
if (!JS_XDRString(xdr, &source) ||
!JS_XDRUint32(xdr, &flagsword)) {
return JS_FALSE;
}
if (xdr->mode == JSXDR_DECODE) {
obj = js_NewObject(xdr->cx, &js_RegExpClass, NULL, NULL);
if (!obj)
return JS_FALSE;
re = js_NewRegExp(xdr->cx, NULL, source, (uint16)flagsword, JS_FALSE);
if (!re)
return JS_FALSE;
if (!JS_SetPrivate(xdr->cx, obj, re) ||
!js_SetLastIndex(xdr->cx, obj, 0)) {
js_DestroyRegExp(xdr->cx, re);
return JS_FALSE;
}
re->cloneIndex = (uint16)(flagsword >> 16);
*objp = obj;
}
return JS_TRUE;
}
#else /* !JS_HAS_XDR */
#define regexp_xdrObject NULL
#endif /* !JS_HAS_XDR */
static uint32
regexp_mark(JSContext *cx, JSObject *obj, void *arg)
{
JSRegExp *re = (JSRegExp *) JS_GetPrivate(cx, obj);
if (re)
GC_MARK(cx, re->source, "source");
return 0;
}
JSClass js_RegExpClass = {
js_RegExp_str,
JSCLASS_HAS_PRIVATE | JSCLASS_HAS_RESERVED_SLOTS(1) |
JSCLASS_HAS_CACHED_PROTO(JSProto_RegExp),
JS_PropertyStub, JS_PropertyStub,
regexp_getProperty, regexp_setProperty,
JS_EnumerateStub, JS_ResolveStub,
JS_ConvertStub, regexp_finalize,
NULL, NULL,
regexp_call, NULL,
regexp_xdrObject, NULL,
regexp_mark, 0
};
static const jschar empty_regexp_ucstr[] = {'(', '?', ':', ')', 0};
JSBool
js_regexp_toString(JSContext *cx, JSObject *obj, uintN argc, jsval *argv,
jsval *rval)
{
JSRegExp *re;
const jschar *source;
jschar *chars;
size_t length, nflags;
uintN flags;
JSString *str;
if (!JS_InstanceOf(cx, obj, &js_RegExpClass, argv))
return JS_FALSE;
JS_LOCK_OBJ(cx, obj);
re = (JSRegExp *) JS_GetPrivate(cx, obj);
if (!re) {
JS_UNLOCK_OBJ(cx, obj);
*rval = STRING_TO_JSVAL(cx->runtime->emptyString);
return JS_TRUE;
}
source = JSSTRING_CHARS(re->source);
length = JSSTRING_LENGTH(re->source);
if (length == 0) {
source = empty_regexp_ucstr;
length = sizeof(empty_regexp_ucstr) / sizeof(jschar) - 1;
}
length += 2;
nflags = 0;
for (flags = re->flags; flags != 0; flags &= flags - 1)
nflags++;
chars = (jschar*) JS_malloc(cx, (length + nflags + 1) * sizeof(jschar));
if (!chars) {
JS_UNLOCK_OBJ(cx, obj);
return JS_FALSE;
}
chars[0] = '/';
js_strncpy(&chars[1], source, length - 2);
chars[length-1] = '/';
if (nflags) {
if (re->flags & JSREG_GLOB)
chars[length++] = 'g';
if (re->flags & JSREG_FOLD)
chars[length++] = 'i';
if (re->flags & JSREG_MULTILINE)
chars[length++] = 'm';
}
JS_UNLOCK_OBJ(cx, obj);
chars[length] = 0;
str = js_NewString(cx, chars, length, 0);
if (!str) {
JS_free(cx, chars);
return JS_FALSE;
}
*rval = STRING_TO_JSVAL(str);
return JS_TRUE;
}
static JSBool
regexp_compile(JSContext *cx, JSObject *obj, uintN argc, jsval *argv,
jsval *rval)
{
JSString *opt, *str;
JSRegExp *oldre, *re;
JSBool ok, ok2;
JSObject *obj2;
size_t length, nbytes;
const jschar *cp, *start, *end;
jschar *nstart, *ncp, *tmp;
if (!JS_InstanceOf(cx, obj, &js_RegExpClass, argv))
return JS_FALSE;
opt = NULL;
if (argc == 0) {
str = cx->runtime->emptyString;
} else {
if (JSVAL_IS_OBJECT(argv[0])) {
/*
* If we get passed in a RegExp object we construct a new
* RegExp that is a duplicate of it by re-compiling the
* original source code. ECMA requires that it be an error
* here if the flags are specified. (We must use the flags
* from the original RegExp also).
*/
obj2 = JSVAL_TO_OBJECT(argv[0]);
if (obj2 && OBJ_GET_CLASS(cx, obj2) == &js_RegExpClass) {
if (argc >= 2 && !JSVAL_IS_VOID(argv[1])) { /* 'flags' passed */
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL,
JSMSG_NEWREGEXP_FLAGGED);
return JS_FALSE;
}
JS_LOCK_OBJ(cx, obj2);
re = (JSRegExp *) JS_GetPrivate(cx, obj2);
if (!re) {
JS_UNLOCK_OBJ(cx, obj2);
return JS_FALSE;
}
re = js_NewRegExp(cx, NULL, re->source, re->flags, JS_FALSE);
JS_UNLOCK_OBJ(cx, obj2);
goto created;
}
}
str = js_ValueToString(cx, argv[0]);
if (!str)
return JS_FALSE;
argv[0] = STRING_TO_JSVAL(str);
if (argc > 1) {
if (JSVAL_IS_VOID(argv[1])) {
opt = NULL;
} else {
opt = js_ValueToString(cx, argv[1]);
if (!opt)
return JS_FALSE;
argv[1] = STRING_TO_JSVAL(opt);
}
}
/* Escape any naked slashes in the regexp source. */
length = JSSTRING_LENGTH(str);
start = JSSTRING_CHARS(str);
end = start + length;
nstart = ncp = NULL;
for (cp = start; cp < end; cp++) {
if (*cp == '/' && (cp == start || cp[-1] != '\\')) {
nbytes = (++length + 1) * sizeof(jschar);
if (!nstart) {
nstart = (jschar *) JS_malloc(cx, nbytes);
if (!nstart)
return JS_FALSE;
ncp = nstart + (cp - start);
js_strncpy(nstart, start, cp - start);
} else {
tmp = (jschar *) JS_realloc(cx, nstart, nbytes);
if (!tmp) {
JS_free(cx, nstart);
return JS_FALSE;
}
ncp = tmp + (ncp - nstart);
nstart = tmp;
}
*ncp++ = '\\';
}
if (nstart)
*ncp++ = *cp;
}
if (nstart) {
/* Don't forget to store the backstop after the new string. */
JS_ASSERT((size_t)(ncp - nstart) == length);
*ncp = 0;
str = js_NewString(cx, nstart, length, 0);
if (!str) {
JS_free(cx, nstart);
return JS_FALSE;
}
argv[0] = STRING_TO_JSVAL(str);
}
}
re = js_NewRegExpOpt(cx, NULL, str, opt, JS_FALSE);
created:
if (!re)
return JS_FALSE;
JS_LOCK_OBJ(cx, obj);
oldre = (JSRegExp *) JS_GetPrivate(cx, obj);
ok = JS_SetPrivate(cx, obj, re);
ok2 = js_SetLastIndex(cx, obj, 0);
JS_UNLOCK_OBJ(cx, obj);
if (!ok) {
js_DestroyRegExp(cx, re);
return JS_FALSE;
}
if (oldre)
js_DestroyRegExp(cx, oldre);
*rval = OBJECT_TO_JSVAL(obj);
return ok2;
}
static JSBool
regexp_exec_sub(JSContext *cx, JSObject *obj, uintN argc, jsval *argv,
JSBool test, jsval *rval)
{
JSBool ok;
JSRegExp *re;
jsdouble lastIndex;
JSString *str;
size_t i;
ok = JS_InstanceOf(cx, obj, &js_RegExpClass, argv);
if (!ok)
return JS_FALSE;
JS_LOCK_OBJ(cx, obj);
re = (JSRegExp *) JS_GetPrivate(cx, obj);
if (!re) {
JS_UNLOCK_OBJ(cx, obj);
return JS_TRUE;
}
/* NB: we must reach out: after this paragraph, in order to drop re. */
HOLD_REGEXP(cx, re);
if (re->flags & JSREG_GLOB) {
ok = js_GetLastIndex(cx, obj, &lastIndex);
} else {
lastIndex = 0;
}
JS_UNLOCK_OBJ(cx, obj);
if (!ok)
goto out;
/* Now that obj is unlocked, it's safe to (potentially) grab the GC lock. */
if (argc == 0) {
str = cx->regExpStatics.pendingInput;
if (!str) {
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL,
JSMSG_NO_INPUT,
JS_GetStringBytes(re->source),
(re->flags & JSREG_GLOB) ? "g" : "",
(re->flags & JSREG_FOLD) ? "i" : "",
(re->flags & JSREG_MULTILINE) ? "m" : "");
ok = JS_FALSE;
goto out;
}
} else {
str = js_ValueToString(cx, argv[0]);
if (!str) {
ok = JS_FALSE;
goto out;
}
argv[0] = STRING_TO_JSVAL(str);
}
if (lastIndex < 0 || JSSTRING_LENGTH(str) < lastIndex) {
ok = js_SetLastIndex(cx, obj, 0);
*rval = JSVAL_NULL;
} else {
i = (size_t) lastIndex;
ok = js_ExecuteRegExp(cx, re, str, &i, test, rval);
if (ok && (re->flags & JSREG_GLOB))
ok = js_SetLastIndex(cx, obj, (*rval == JSVAL_NULL) ? 0 : i);
}
out:
DROP_REGEXP(cx, re);
return ok;
}
static JSBool
regexp_exec(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval)
{
return regexp_exec_sub(cx, obj, argc, argv, JS_FALSE, rval);
}
static JSBool
regexp_test(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval)
{
if (!regexp_exec_sub(cx, obj, argc, argv, JS_TRUE, rval))
return JS_FALSE;
if (*rval != JSVAL_TRUE)
*rval = JSVAL_FALSE;
return JS_TRUE;
}
static JSFunctionSpec regexp_methods[] = {
#if JS_HAS_TOSOURCE
{js_toSource_str, js_regexp_toString, 0,0,0},
#endif
{js_toString_str, js_regexp_toString, 0,0,0},
{"compile", regexp_compile, 1,0,0},
{"exec", regexp_exec, 0,0,0},
{"test", regexp_test, 0,0,0},
{0,0,0,0,0}
};
static JSBool
RegExp(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval)
{
if (!(cx->fp->flags & JSFRAME_CONSTRUCTING)) {
/*
* If first arg is regexp and no flags are given, just return the arg.
* (regexp_compile detects the regexp + flags case and throws a
* TypeError.) See 10.15.3.1.
*/
if ((argc < 2 || JSVAL_IS_VOID(argv[1])) &&
!JSVAL_IS_PRIMITIVE(argv[0]) &&
OBJ_GET_CLASS(cx, JSVAL_TO_OBJECT(argv[0])) == &js_RegExpClass) {
*rval = argv[0];
return JS_TRUE;
}
/* Otherwise, replace obj with a new RegExp object. */
obj = js_NewObject(cx, &js_RegExpClass, NULL, NULL);
if (!obj)
return JS_FALSE;
/*
* regexp_compile does not use rval to root its temporaries
* so we can use it to root obj.
*/
*rval = OBJECT_TO_JSVAL(obj);
}
return regexp_compile(cx, obj, argc, argv, rval);
}
JSObject *
js_InitRegExpClass(JSContext *cx, JSObject *obj)
{
JSObject *proto, *ctor;
jsval rval;
proto = JS_InitClass(cx, obj, NULL, &js_RegExpClass, RegExp, 1,
regexp_props, regexp_methods,
regexp_static_props, NULL);
if (!proto || !(ctor = JS_GetConstructor(cx, proto)))
return NULL;
if (!JS_AliasProperty(cx, ctor, "input", "$_") ||
!JS_AliasProperty(cx, ctor, "multiline", "$*") ||
!JS_AliasProperty(cx, ctor, "lastMatch", "$&") ||
!JS_AliasProperty(cx, ctor, "lastParen", "$+") ||
!JS_AliasProperty(cx, ctor, "leftContext", "$`") ||
!JS_AliasProperty(cx, ctor, "rightContext", "$'")) {
goto bad;
}
/* Give RegExp.prototype private data so it matches the empty string. */
if (!regexp_compile(cx, proto, 0, NULL, &rval))
goto bad;
return proto;
bad:
JS_DeleteProperty(cx, obj, js_RegExpClass.name);
return NULL;
}
JSObject *
js_NewRegExpObject(JSContext *cx, JSTokenStream *ts,
jschar *chars, size_t length, uintN flags)
{
JSString *str;
JSObject *obj;
JSRegExp *re;
JSTempValueRooter tvr;
str = js_NewStringCopyN(cx, chars, length, 0);
if (!str)
return NULL;
JS_PUSH_TEMP_ROOT_STRING(cx, str, &tvr);
re = js_NewRegExp(cx, ts, str, flags, JS_FALSE);
if (!re) {
JS_POP_TEMP_ROOT(cx, &tvr);
return NULL;
}
obj = js_NewObject(cx, &js_RegExpClass, NULL, NULL);
if (!obj || !JS_SetPrivate(cx, obj, re)) {
js_DestroyRegExp(cx, re);
obj = NULL;
}
if (obj && !js_SetLastIndex(cx, obj, 0))
obj = NULL;
JS_POP_TEMP_ROOT(cx, &tvr);
return obj;
}
JSObject *
js_CloneRegExpObject(JSContext *cx, JSObject *obj, JSObject *parent)
{
JSObject *clone;
JSRegExp *re;
JS_ASSERT(OBJ_GET_CLASS(cx, obj) == &js_RegExpClass);
clone = js_NewObject(cx, &js_RegExpClass, NULL, parent);
if (!clone)
return NULL;
re = JS_GetPrivate(cx, obj);
if (!JS_SetPrivate(cx, clone, re) || !js_SetLastIndex(cx, clone, 0)) {
cx->weakRoots.newborn[GCX_OBJECT] = NULL;
return NULL;
}
HOLD_REGEXP(cx, re);
return clone;
}
JSBool
js_GetLastIndex(JSContext *cx, JSObject *obj, jsdouble *lastIndex)
{
jsval v;
return JS_GetReservedSlot(cx, obj, 0, &v) &&
js_ValueToNumber(cx, v, lastIndex);
}
JSBool
js_SetLastIndex(JSContext *cx, JSObject *obj, jsdouble lastIndex)
{
jsval v;
return js_NewNumberValue(cx, lastIndex, &v) &&
JS_SetReservedSlot(cx, obj, 0, v);
}
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