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jsscan.cpp
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jsscan.cpp
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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 lexical scanner.
*/
#include <stdio.h> /* first to avoid trouble on some systems */
#include <errno.h>
#include <limits.h>
#include <math.h>
#ifdef HAVE_MEMORY_H
#include <memory.h>
#endif
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include "jstypes.h"
#include "jsstdint.h"
#include "jsarena.h"
#include "jsbit.h"
#include "jsutil.h"
#include "jsprf.h"
#include "jsapi.h"
#include "jsatom.h"
#include "jscntxt.h"
#include "jsversion.h"
#include "jsemit.h"
#include "jsexn.h"
#include "jsnum.h"
#include "jsopcode.h"
#include "jsparse.h"
#include "jsregexp.h"
#include "jsscan.h"
#include "jsscript.h"
#include "jsstaticcheck.h"
#include "jsvector.h"
#include "jsscriptinlines.h"
#if JS_HAS_XML_SUPPORT
#include "jsxml.h"
#endif
using namespace js;
#define JS_KEYWORD(keyword, type, op, version) \
const char js_##keyword##_str[] = #keyword;
#include "jskeyword.tbl"
#undef JS_KEYWORD
static const KeywordInfo keywords[] = {
#define JS_KEYWORD(keyword, type, op, version) \
{js_##keyword##_str, type, op, version},
#include "jskeyword.tbl"
#undef JS_KEYWORD
};
namespace js {
const KeywordInfo *
FindKeyword(const jschar *s, size_t length)
{
JS_ASSERT(length != 0);
register size_t i;
const struct KeywordInfo *kw;
const char *chars;
#define JSKW_LENGTH() length
#define JSKW_AT(column) s[column]
#define JSKW_GOT_MATCH(index) i = (index); goto got_match;
#define JSKW_TEST_GUESS(index) i = (index); goto test_guess;
#define JSKW_NO_MATCH() goto no_match;
#include "jsautokw.h"
#undef JSKW_NO_MATCH
#undef JSKW_TEST_GUESS
#undef JSKW_GOT_MATCH
#undef JSKW_AT
#undef JSKW_LENGTH
got_match:
return &keywords[i];
test_guess:
kw = &keywords[i];
chars = kw->chars;
do {
if (*s++ != (unsigned char)(*chars++))
goto no_match;
} while (--length != 0);
return kw;
no_match:
return NULL;
}
} // namespace js
JSBool
js_IsIdentifier(JSLinearString *str)
{
const jschar *chars = str->chars();
size_t length = str->length();
if (length == 0)
return JS_FALSE;
jschar c = *chars;
if (!JS_ISIDSTART(c))
return JS_FALSE;
const jschar *end = chars + length;
while (++chars != end) {
c = *chars;
if (!JS_ISIDENT(c))
return JS_FALSE;
}
return JS_TRUE;
}
#ifdef _MSC_VER
#pragma warning(push)
#pragma warning(disable:4351)
#endif
/* Initialize members that aren't initialized in |init|. */
TokenStream::TokenStream(JSContext *cx)
: cx(cx), tokens(), cursor(), lookahead(), flags(), listenerTSData(), tokenbuf(cx)
{}
#ifdef _MSC_VER
#pragma warning(pop)
#endif
bool
TokenStream::init(const jschar *base, size_t length, const char *fn, uintN ln, JSVersion v)
{
filename = fn;
lineno = ln;
version = v;
xml = VersionHasXML(v);
userbuf.init(base, length);
linebase = base;
prevLinebase = NULL;
listener = cx->debugHooks->sourceHandler;
listenerData = cx->debugHooks->sourceHandlerData;
/*
* This table holds all the token kinds that satisfy these properties:
* - A single char long.
* - Cannot be a prefix of any longer token (eg. '+' is excluded because
* '+=' is a valid token).
* - Doesn't need tp->t_op set (eg. this excludes '~').
*
* The few token kinds satisfying these properties cover roughly 35--45%
* of the tokens seen in practice.
*
* Nb: oneCharTokens, maybeEOL and maybeStrSpecial could be static, but
* initializing them this way is a bit easier. Don't worry, the time to
* initialize them for each TokenStream is trivial. See bug 639420.
*/
memset(oneCharTokens, 0, sizeof(oneCharTokens));
oneCharTokens[unsigned(';')] = TOK_SEMI;
oneCharTokens[unsigned(',')] = TOK_COMMA;
oneCharTokens[unsigned('?')] = TOK_HOOK;
oneCharTokens[unsigned('[')] = TOK_LB;
oneCharTokens[unsigned(']')] = TOK_RB;
oneCharTokens[unsigned('{')] = TOK_LC;
oneCharTokens[unsigned('}')] = TOK_RC;
oneCharTokens[unsigned('(')] = TOK_LP;
oneCharTokens[unsigned(')')] = TOK_RP;
/* See getChar() for an explanation of maybeEOL[]. */
memset(maybeEOL, 0, sizeof(maybeEOL));
maybeEOL[unsigned('\n')] = true;
maybeEOL[unsigned('\r')] = true;
maybeEOL[unsigned(LINE_SEPARATOR & 0xff)] = true;
maybeEOL[unsigned(PARA_SEPARATOR & 0xff)] = true;
/* See getTokenInternal() for an explanation of maybeStrSpecial[]. */
memset(maybeStrSpecial, 0, sizeof(maybeStrSpecial));
maybeStrSpecial[unsigned('"')] = true;
maybeStrSpecial[unsigned('\'')] = true;
maybeStrSpecial[unsigned('\\')] = true;
maybeStrSpecial[unsigned('\n')] = true;
maybeStrSpecial[unsigned('\r')] = true;
maybeStrSpecial[unsigned(LINE_SEPARATOR & 0xff)] = true;
maybeStrSpecial[unsigned(PARA_SEPARATOR & 0xff)] = true;
maybeStrSpecial[unsigned(EOF & 0xff)] = true;
return true;
}
TokenStream::~TokenStream()
{
if (flags & TSF_OWNFILENAME)
cx->free_((void *) filename);
}
/* Use the fastest available getc. */
#if defined(HAVE_GETC_UNLOCKED)
# define fast_getc getc_unlocked
#elif defined(HAVE__GETC_NOLOCK)
# define fast_getc _getc_nolock
#else
# define fast_getc getc
#endif
JS_FRIEND_API(int)
js_fgets(char *buf, int size, FILE *file)
{
int n, i, c;
JSBool crflag;
n = size - 1;
if (n < 0)
return -1;
crflag = JS_FALSE;
for (i = 0; i < n && (c = fast_getc(file)) != EOF; i++) {
buf[i] = c;
if (c == '\n') { /* any \n ends a line */
i++; /* keep the \n; we know there is room for \0 */
break;
}
if (crflag) { /* \r not followed by \n ends line at the \r */
ungetc(c, file);
break; /* and overwrite c in buf with \0 */
}
crflag = (c == '\r');
}
buf[i] = '\0';
return i;
}
/* This gets the next char, normalizing all EOL sequences to '\n' as it goes. */
int32
TokenStream::getChar()
{
int32 c;
if (JS_LIKELY(userbuf.hasRawChars())) {
c = userbuf.getRawChar();
/*
* Normalize the jschar if it was a newline. We need to detect any of
* these four characters: '\n' (0x000a), '\r' (0x000d),
* LINE_SEPARATOR (0x2028), PARA_SEPARATOR (0x2029). Testing for each
* one in turn is slow, so we use a single probabilistic check, and if
* that succeeds, test for them individually.
*
* We use the bottom 8 bits to index into a lookup table, succeeding
* when d&0xff is 0xa, 0xd, 0x28 or 0x29. Among ASCII chars (which
* are by the far the most common) this gives false positives for '('
* (0x0028) and ')' (0x0029). We could avoid those by incorporating
* the 13th bit of d into the lookup, but that requires extra shifting
* and masking and isn't worthwhile. See TokenStream::init() for the
* initialization of the relevant entries in the table.
*/
if (JS_UNLIKELY(maybeEOL[c & 0xff])) {
if (c == '\n')
goto eol;
if (c == '\r') {
/* if it's a \r\n sequence: treat as a single EOL, skip over the \n */
if (userbuf.hasRawChars())
userbuf.matchRawChar('\n');
goto eol;
}
if (c == LINE_SEPARATOR || c == PARA_SEPARATOR)
goto eol;
}
return c;
}
flags |= TSF_EOF;
return EOF;
eol:
prevLinebase = linebase;
linebase = userbuf.addressOfNextRawChar();
lineno++;
return '\n';
}
/*
* This gets the next char. It does nothing special with EOL sequences, not
* even updating the line counters. It can be used safely if (a) the
* resulting char is guaranteed to be ungotten (by ungetCharIgnoreEOL()) if
* it's an EOL, and (b) the line-related state (lineno, linebase) is not used
* before it's ungotten.
*/
int32
TokenStream::getCharIgnoreEOL()
{
if (JS_LIKELY(userbuf.hasRawChars()))
return userbuf.getRawChar();
flags |= TSF_EOF;
return EOF;
}
void
TokenStream::ungetChar(int32 c)
{
if (c == EOF)
return;
JS_ASSERT(!userbuf.atStart());
userbuf.ungetRawChar();
if (c == '\n') {
#ifdef DEBUG
int32 c2 = userbuf.peekRawChar();
JS_ASSERT(TokenBuf::isRawEOLChar(c2));
#endif
/* if it's a \r\n sequence, also unget the \r */
if (!userbuf.atStart())
userbuf.matchRawCharBackwards('\r');
JS_ASSERT(prevLinebase); /* we should never get more than one EOL char */
linebase = prevLinebase;
prevLinebase = NULL;
lineno--;
} else {
JS_ASSERT(userbuf.peekRawChar() == c);
}
}
void
TokenStream::ungetCharIgnoreEOL(int32 c)
{
if (c == EOF)
return;
JS_ASSERT(!userbuf.atStart());
userbuf.ungetRawChar();
}
/*
* Peek n chars ahead into ts. Return true if n chars were read, false if
* there weren't enough characters in the input stream. This function cannot
* be used to peek into or past a newline.
*/
bool
TokenStream::peekChars(intN n, jschar *cp)
{
intN i, j;
int32 c;
for (i = 0; i < n; i++) {
c = getChar();
if (c == EOF)
break;
if (c == '\n') {
ungetChar(c);
break;
}
cp[i] = (jschar)c;
}
for (j = i - 1; j >= 0; j--)
ungetChar(cp[j]);
return i == n;
}
const jschar *
TokenStream::TokenBuf::findEOL()
{
const jschar *tmp = ptr;
#ifdef DEBUG
/*
* This is the one exception to the "TokenBuf isn't accessed after
* poisoning" rule -- we may end up calling findEOL() in order to set up
* an error.
*/
if (!tmp)
tmp = ptrWhenPoisoned;
#endif
while (true) {
if (tmp >= limit)
break;
if (TokenBuf::isRawEOLChar(*tmp++))
break;
}
return tmp;
}
bool
TokenStream::reportCompileErrorNumberVA(JSParseNode *pn, uintN flags, uintN errorNumber,
va_list ap)
{
JSErrorReport report;
char *message;
jschar *linechars;
char *linebytes;
bool warning;
JSBool ok;
const TokenPos *tp;
uintN i;
if (JSREPORT_IS_STRICT(flags) && !cx->hasStrictOption())
return true;
warning = JSREPORT_IS_WARNING(flags);
if (warning && cx->hasWErrorOption()) {
flags &= ~JSREPORT_WARNING;
warning = false;
}
PodZero(&report);
report.flags = flags;
report.errorNumber = errorNumber;
message = NULL;
linechars = NULL;
linebytes = NULL;
MUST_FLOW_THROUGH("out");
ok = js_ExpandErrorArguments(cx, js_GetErrorMessage, NULL,
errorNumber, &message, &report,
!(flags & JSREPORT_UC), ap);
if (!ok) {
warning = false;
goto out;
}
report.filename = filename;
tp = pn ? &pn->pn_pos : ¤tToken().pos;
report.lineno = tp->begin.lineno;
/*
* Given a token, T, that we want to complain about: if T's (starting)
* lineno doesn't match TokenStream's lineno, that means we've scanned past
* the line that T starts on, which makes it hard to print some or all of
* T's (starting) line for context.
*
* So we don't even try, leaving report.linebuf and friends zeroed. This
* means that any error involving a multi-line token (eg. an unterminated
* multi-line string literal) won't have a context printed.
*/
if (report.lineno == lineno) {
size_t linelength = userbuf.findEOL() - linebase;
linechars = (jschar *)cx->malloc_((linelength + 1) * sizeof(jschar));
if (!linechars) {
warning = false;
goto out;
}
memcpy(linechars, linebase, linelength * sizeof(jschar));
linechars[linelength] = 0;
linebytes = js_DeflateString(cx, linechars, linelength);
if (!linebytes) {
warning = false;
goto out;
}
/* Unicode and char versions of the offending source line, without final \n */
report.linebuf = linebytes;
report.uclinebuf = linechars;
/* The lineno check above means we should only see single-line tokens here. */
JS_ASSERT(tp->begin.lineno == tp->end.lineno);
report.tokenptr = report.linebuf + tp->begin.index;
report.uctokenptr = report.uclinebuf + tp->begin.index;
}
/*
* If there's a runtime exception type associated with this error
* number, set that as the pending exception. For errors occuring at
* compile time, this is very likely to be a JSEXN_SYNTAXERR.
*
* If an exception is thrown but not caught, the JSREPORT_EXCEPTION
* flag will be set in report.flags. Proper behavior for an error
* reporter is to ignore a report with this flag for all but top-level
* compilation errors. The exception will remain pending, and so long
* as the non-top-level "load", "eval", or "compile" native function
* returns false, the top-level reporter will eventually receive the
* uncaught exception report.
*/
if (!js_ErrorToException(cx, message, &report, NULL, NULL)) {
/*
* If debugErrorHook is present then we give it a chance to veto
* sending the error on to the regular error reporter.
*/
bool reportError = true;
if (JSDebugErrorHook hook = cx->debugHooks->debugErrorHook)
reportError = hook(cx, message, &report, cx->debugHooks->debugErrorHookData);
/* Report the error */
if (reportError && cx->errorReporter)
cx->errorReporter(cx, message, &report);
}
out:
if (linebytes)
cx->free_(linebytes);
if (linechars)
cx->free_(linechars);
if (message)
cx->free_(message);
if (report.ucmessage)
cx->free_((void *)report.ucmessage);
if (report.messageArgs) {
if (!(flags & JSREPORT_UC)) {
i = 0;
while (report.messageArgs[i])
cx->free_((void *)report.messageArgs[i++]);
}
cx->free_((void *)report.messageArgs);
}
return warning;
}
bool
js::ReportStrictModeError(JSContext *cx, TokenStream *ts, JSTreeContext *tc, JSParseNode *pn,
uintN errorNumber, ...)
{
JS_ASSERT(ts || tc);
JS_ASSERT(cx == ts->getContext());
/* In strict mode code, this is an error, not merely a warning. */
uintN flags;
if ((ts && ts->isStrictMode()) || (tc && (tc->flags & TCF_STRICT_MODE_CODE))) {
flags = JSREPORT_ERROR;
} else {
if (!cx->hasStrictOption())
return true;
flags = JSREPORT_WARNING;
}
va_list ap;
va_start(ap, errorNumber);
bool result = ts->reportCompileErrorNumberVA(pn, flags, errorNumber, ap);
va_end(ap);
return result;
}
bool
js::ReportCompileErrorNumber(JSContext *cx, TokenStream *ts, JSParseNode *pn,
uintN flags, uintN errorNumber, ...)
{
va_list ap;
/*
* We don't accept a JSTreeContext argument, so we can't implement
* JSREPORT_STRICT_MODE_ERROR here. Use ReportStrictModeError instead,
* or do the checks in the caller and pass plain old JSREPORT_ERROR.
*/
JS_ASSERT(!(flags & JSREPORT_STRICT_MODE_ERROR));
va_start(ap, errorNumber);
JS_ASSERT(cx == ts->getContext());
bool result = ts->reportCompileErrorNumberVA(pn, flags, errorNumber, ap);
va_end(ap);
return result;
}
#if JS_HAS_XML_SUPPORT
bool
TokenStream::getXMLEntity()
{
ptrdiff_t offset, length, i;
int c, d;
JSBool ispair;
jschar *bp, digit;
char *bytes;
JSErrNum msg;
CharBuffer &tb = tokenbuf;
/* Put the entity, including the '&' already scanned, in tokenbuf. */
offset = tb.length();
if (!tb.append('&'))
return false;
while ((c = getChar()) != ';') {
if (c == EOF || c == '\n') {
ReportCompileErrorNumber(cx, this, NULL, JSREPORT_ERROR, JSMSG_END_OF_XML_ENTITY);
return false;
}
if (!tb.append(c))
return false;
}
/* Let length be the number of jschars after the '&', including the ';'. */
length = tb.length() - offset;
bp = tb.begin() + offset;
c = d = 0;
ispair = false;
if (length > 2 && bp[1] == '#') {
/* Match a well-formed XML Character Reference. */
i = 2;
if (length > 3 && JS_TOLOWER(bp[i]) == 'x') {
if (length > 9) /* at most 6 hex digits allowed */
goto badncr;
while (++i < length) {
digit = bp[i];
if (!JS7_ISHEX(digit))
goto badncr;
c = (c << 4) + JS7_UNHEX(digit);
}
} else {
while (i < length) {
digit = bp[i++];
if (!JS7_ISDEC(digit))
goto badncr;
c = (c * 10) + JS7_UNDEC(digit);
if (c < 0)
goto badncr;
}
}
if (0x10000 <= c && c <= 0x10FFFF) {
/* Form a surrogate pair (c, d) -- c is the high surrogate. */
d = 0xDC00 + (c & 0x3FF);
c = 0xD7C0 + (c >> 10);
ispair = true;
} else {
/* Enforce the http://www.w3.org/TR/REC-xml/#wf-Legalchar WFC. */
if (c != 0x9 && c != 0xA && c != 0xD &&
!(0x20 <= c && c <= 0xD7FF) &&
!(0xE000 <= c && c <= 0xFFFD)) {
goto badncr;
}
}
} else {
/* Try to match one of the five XML 1.0 predefined entities. */
switch (length) {
case 3:
if (bp[2] == 't') {
if (bp[1] == 'l')
c = '<';
else if (bp[1] == 'g')
c = '>';
}
break;
case 4:
if (bp[1] == 'a' && bp[2] == 'm' && bp[3] == 'p')
c = '&';
break;
case 5:
if (bp[3] == 'o') {
if (bp[1] == 'a' && bp[2] == 'p' && bp[4] == 's')
c = '\'';
else if (bp[1] == 'q' && bp[2] == 'u' && bp[4] == 't')
c = '"';
}
break;
}
if (c == 0) {
msg = JSMSG_UNKNOWN_XML_ENTITY;
goto bad;
}
}
/* If we matched, retract tokenbuf and store the entity's value. */
*bp++ = (jschar) c;
if (ispair)
*bp++ = (jschar) d;
tb.shrinkBy(tb.end() - bp);
return true;
badncr:
msg = JSMSG_BAD_XML_NCR;
bad:
/* No match: throw a TypeError per ECMA-357 10.3.2.1 step 8(a). */
JS_ASSERT((tb.end() - bp) >= 1);
bytes = js_DeflateString(cx, bp + 1, (tb.end() - bp) - 1);
if (bytes) {
ReportCompileErrorNumber(cx, this, NULL, JSREPORT_ERROR, msg, bytes);
cx->free_(bytes);
}
return false;
}
bool
TokenStream::getXMLTextOrTag(TokenKind *ttp, Token **tpp)
{
TokenKind tt;
int c, qc;
Token *tp;
JSAtom *atom;
/*
* Look for XML text.
*/
if (flags & TSF_XMLTEXTMODE) {
tt = TOK_XMLSPACE; /* veto if non-space, return TOK_XMLTEXT */
tp = newToken(0);
tokenbuf.clear();
qc = (flags & TSF_XMLONLYMODE) ? '<' : '{';
while ((c = getChar()) != qc && c != '<' && c != EOF) {
if (c == '&' && qc == '<') {
if (!getXMLEntity())
goto error;
tt = TOK_XMLTEXT;
continue;
}
if (!JS_ISXMLSPACE(c))
tt = TOK_XMLTEXT;
if (!tokenbuf.append(c))
goto error;
}
ungetChar(c);
if (tokenbuf.empty()) {
atom = NULL;
} else {
atom = atomize(cx, tokenbuf);
if (!atom)
goto error;
}
tp->pos.end.lineno = lineno;
tp->t_op = JSOP_STRING;
tp->t_atom = atom;
goto out;
}
/*
* XML tags.
*/
else {
JS_ASSERT(flags & TSF_XMLTAGMODE);
tp = newToken(0);
c = getChar();
if (JS_ISXMLSPACE(c)) {
do {
c = getChar();
} while (JS_ISXMLSPACE(c));
ungetChar(c);
tp->pos.end.lineno = lineno;
tt = TOK_XMLSPACE;
goto out;
}
if (c == EOF) {
tt = TOK_EOF;
goto out;
}
tokenbuf.clear();
if (JS_ISXMLNSSTART(c)) {
JSBool sawColon = JS_FALSE;
if (!tokenbuf.append(c))
goto error;
while ((c = getChar()) != EOF && JS_ISXMLNAME(c)) {
if (c == ':') {
int nextc;
if (sawColon ||
(nextc = peekChar(),
((flags & TSF_XMLONLYMODE) || nextc != '{') &&
!JS_ISXMLNAME(nextc))) {
ReportCompileErrorNumber(cx, this, NULL, JSREPORT_ERROR,
JSMSG_BAD_XML_QNAME);
goto error;
}
sawColon = JS_TRUE;
}
if (!tokenbuf.append(c))
goto error;
}
ungetChar(c);
atom = atomize(cx, tokenbuf);
if (!atom)
goto error;
tp->t_op = JSOP_STRING;
tp->t_atom = atom;
tt = TOK_XMLNAME;
goto out;
}
switch (c) {
case '{':
if (flags & TSF_XMLONLYMODE)
goto bad_xml_char;
tt = TOK_LC;
goto out;
case '=':
tt = TOK_ASSIGN;
goto out;
case '"':
case '\'':
qc = c;
while ((c = getChar()) != qc) {
if (c == EOF) {
ReportCompileErrorNumber(cx, this, NULL, JSREPORT_ERROR,
JSMSG_UNTERMINATED_STRING);
goto error;
}
/*
* XML attribute values are double-quoted when pretty-printed,
* so escape " if it is expressed directly in a single-quoted
* attribute value.
*/
if (c == '"' && !(flags & TSF_XMLONLYMODE)) {
JS_ASSERT(qc == '\'');
if (!tokenbuf.append(js_quot_entity_str,
strlen(js_quot_entity_str)))
goto error;
continue;
}
if (c == '&' && (flags & TSF_XMLONLYMODE)) {
if (!getXMLEntity())
goto error;
continue;
}
if (!tokenbuf.append(c))
goto error;
}
atom = atomize(cx, tokenbuf);
if (!atom)
goto error;
tp->pos.end.lineno = lineno;
tp->t_op = JSOP_STRING;
tp->t_atom = atom;
tt = TOK_XMLATTR;
goto out;
case '>':
tt = TOK_XMLTAGC;
goto out;
case '/':
if (matchChar('>')) {
tt = TOK_XMLPTAGC;
goto out;
}
/* FALL THROUGH */
bad_xml_char:
default:
ReportCompileErrorNumber(cx, this, NULL, JSREPORT_ERROR, JSMSG_BAD_XML_CHARACTER);
goto error;
}
JS_NOT_REACHED("getXMLTextOrTag 1");
}
JS_NOT_REACHED("getXMLTextOrTag 2");
out:
*ttp = tt;
*tpp = tp;
return true;
error:
*ttp = TOK_ERROR;
*tpp = tp;
return false;
}
/*
* After much testing, it's clear that Postel's advice to protocol designers
* ("be liberal in what you accept, and conservative in what you send") invites
* a natural-law repercussion for JS as "protocol":
*
* "If you are liberal in what you accept, others will utterly fail to be
* conservative in what they send."
*
* Which means you will get <!-- comments to end of line in the middle of .js
* files, and after if conditions whose then statements are on the next line,
* and other wonders. See at least the following bugs:
* - https://bugzilla.mozilla.org/show_bug.cgi?id=309242
* - https://bugzilla.mozilla.org/show_bug.cgi?id=309712
* - https://bugzilla.mozilla.org/show_bug.cgi?id=310993
*
* So without JSOPTION_XML, we changed around Firefox 1.5 never to scan an XML
* comment or CDATA literal. Instead, we always scan <! as the start of an
* HTML comment hack to end of line, used since Netscape 2 to hide script tag
* content from script-unaware browsers.
*
* But this still leaves XML resources with certain internal structure
* vulnerable to being loaded as script cross-origin, and some internal data
* stolen, so for Firefox 3.5 and beyond, we reject programs whose source
* consists only of XML literals. See:
*
* https://bugzilla.mozilla.org/show_bug.cgi?id=336551
*
* The check for this is in jsparse.cpp, Compiler::compileScript.
*/
bool
TokenStream::getXMLMarkup(TokenKind *ttp, Token **tpp)
{
TokenKind tt;
int c;
Token *tp = *tpp;
JSAtom *atom;
JSBool inTarget;
size_t targetLength;
ptrdiff_t contentIndex;
/* Check for XML comment or CDATA section. */
if (matchChar('!')) {
tokenbuf.clear();
/* Scan XML comment. */
if (matchChar('-')) {
if (!matchChar('-'))
goto bad_xml_markup;
while ((c = getChar()) != '-' || !matchChar('-')) {
if (c == EOF)
goto bad_xml_markup;
if (!tokenbuf.append(c))
goto error;
}
tt = TOK_XMLCOMMENT;
tp->t_op = JSOP_XMLCOMMENT;
goto finish_xml_markup;
}
/* Scan CDATA section. */
if (matchChar('[')) {
jschar cp[6];
if (peekChars(6, cp) &&
cp[0] == 'C' &&
cp[1] == 'D' &&
cp[2] == 'A' &&
cp[3] == 'T' &&
cp[4] == 'A' &&
cp[5] == '[') {
skipChars(6);
while ((c = getChar()) != ']' ||
!peekChars(2, cp) ||
cp[0] != ']' ||
cp[1] != '>') {
if (c == EOF)
goto bad_xml_markup;
if (!tokenbuf.append(c))
goto error;
}
getChar(); /* discard ] but not > */
tt = TOK_XMLCDATA;
tp->t_op = JSOP_XMLCDATA;
goto finish_xml_markup;
}
goto bad_xml_markup;
}
}
/* Check for processing instruction. */
if (matchChar('?')) {
inTarget = JS_TRUE;
targetLength = 0;
contentIndex = -1;
tokenbuf.clear();
while ((c = getChar()) != '?' || peekChar() != '>') {
if (c == EOF)
goto bad_xml_markup;
if (inTarget) {
if (JS_ISXMLSPACE(c)) {
if (tokenbuf.empty())
goto bad_xml_markup;