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gecko/js/src/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):
* Nick Fitzgerald <nfitzgerald@mozilla.com>
*
* 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 "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 "jsscan.h"
#include "jsscript.h"
#include "vm/RegExpObject.h"
#include "jsscriptinlines.h"
#if JS_HAS_XML_SUPPORT
#include "jsxml.h"
#endif
using namespace js;
using namespace js::unicode;
#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 (!IsIdentifierStart(c))
return JS_FALSE;
const jschar *end = chars + length;
while (++chars != end) {
c = *chars;
if (!IsIdentifierPart(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;
sourceMap = NULL;
JSSourceHandler listener = cx->debugHooks->sourceHandler;
void *listenerData = cx->debugHooks->sourceHandlerData;
if (listener)
listener(fn, ln, base, length, &listenerTSData, listenerData);
/*
* 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;
/*
* Set |ln| as the beginning line number of the ungot "current token", so
* that js::Parser::statements (and potentially other such methods, in the
* future) can create parse nodes with good source coordinates before they
* explicitly get any tokens.
*
* Switching the parser/lexer so we always get the next token ahead of the
* parser needing it (the so-called "pump-priming" model) might be a better
* way to address the dependency from statements on the current token.
*/
tokens[0].pos.begin.lineno = tokens[0].pos.end.lineno = ln;
return true;
}
TokenStream::~TokenStream()
{
if (flags & TSF_OWNFILENAME)
cx->free_((void *) filename);
if (sourceMap)
cx->free_(sourceMap);
}
/* 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;
}
JS_ALWAYS_INLINE void
TokenStream::updateLineInfoForEOL()
{
prevLinebase = linebase;
linebase = userbuf.addressOfNextRawChar();
lineno++;
}
JS_ALWAYS_INLINE void
TokenStream::updateFlagsForEOL()
{
flags &= ~TSF_DIRTYLINE;
flags |= TSF_EOL;
}
/* 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:
updateLineInfoForEOL();
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();
}
/*
* Return true iff |n| raw characters can be read from this without reading past
* EOF or a newline, and copy those characters into |cp| if so. The characters
* are not consumed: use skipChars(n) to do so after checking that the consumed
* characters had appropriate values.
*/
bool
TokenStream::peekChars(intN n, jschar *cp)
{
intN i, j;
int32 c;
for (i = 0; i < n; i++) {
c = getCharIgnoreEOL();
if (c == EOF)
break;
if (c == '\n') {
ungetCharIgnoreEOL(c);
break;
}
cp[i] = (jschar)c;
}
for (j = i - 1; j >= 0; j--)
ungetCharIgnoreEOL(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 : &currentToken().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 = 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 && (bp[i] == 'x' || 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 = 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 (!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 (c != EOF && IsXMLSpace(c)) {
do {
c = getChar();
if (c == EOF)
break;
} while (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 (IsXMLNamespaceStart(c)) {
JSBool sawColon = JS_FALSE;
if (!tokenbuf.append(c))
goto error;
while ((c = getChar()) != EOF && IsXMLNamePart(c)) {
if (c == ':') {
int nextc;
if (sawColon ||
(nextc = peekChar(),
((flags & TSF_XMLONLYMODE) || nextc != '{') &&
!IsXMLNamePart(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 (IsXMLSpace(c)) {
if (tokenbuf.empty())
goto bad_xml_markup;
inTarget = JS_FALSE;
} else {
if (!(tokenbuf.empty()
? IsXMLNamespaceStart(c)
: IsXMLNamespacePart(c))) {
goto bad_xml_markup;
}
++targetLength;
}
} else {
if (contentIndex < 0 && !IsXMLSpace(c))
contentIndex = tokenbuf.length();
}
if (!tokenbuf.append(c))
goto error;
}
if (targetLength == 0)
goto bad_xml_markup;
if (contentIndex < 0) {
atom = cx->runtime->atomState.emptyAtom;
} else {
atom = js_AtomizeChars(cx, tokenbuf.begin() + contentIndex,
tokenbuf.length() - contentIndex);
if (!atom)
goto error;
}
tokenbuf.shrinkBy(tokenbuf.length() - targetLength);
tp->t_atom2 = atom;
tt = TOK_XMLPI;
finish_xml_markup:
if (!matchChar('>'))
goto bad_xml_markup;
atom = atomize(cx, tokenbuf);
if (!atom)
goto error;
tp->t_atom = atom;
tp->pos.end.lineno = lineno;
goto out;
}
/* An XML start-of-tag character. */
tt = matchChar('/') ? TOK_XMLETAGO : TOK_XMLSTAGO;
out:
*ttp = tt;
*tpp = tp;
return true;
bad_xml_markup:
ReportCompileErrorNumber(cx, this, NULL, JSREPORT_ERROR, JSMSG_BAD_XML_MARKUP);
error:
*ttp = TOK_ERROR;
*tpp = tp;
return false;
}
#endif /* JS_HAS_XML_SUPPORT */
/*
* We have encountered a '\': check for a Unicode escape sequence after it.
* Return 'true' and the character code value (by value) if we found a
* Unicode escape sequence. Otherwise, return 'false'. In both cases, do not
* advance along the buffer.
*/
bool
TokenStream::peekUnicodeEscape(int *result)
{
jschar cp[5];
if (peekChars(5, cp) && cp[0] == 'u' &&
JS7_ISHEX(cp[1]) && JS7_ISHEX(cp[2]) &&
JS7_ISHEX(cp[3]) && JS7_ISHEX(cp[4]))
{
*result = (((((JS7_UNHEX(cp[1]) << 4)
+ JS7_UNHEX(cp[2])) << 4)
+ JS7_UNHEX(cp[3])) << 4)
+ JS7_UNHEX(cp[4]);
return true;
}
return false;
}
bool
TokenStream::matchUnicodeEscapeIdStart(int32 *cp)
{
if (peekUnicodeEscape(cp) && IsIdentifierStart(*cp)) {
skipChars(5);
return true;
}
return false;
}
bool
TokenStream::matchUnicodeEscapeIdent(int32 *cp)
{
if (peekUnicodeEscape(cp) && IsIdentifierPart(*cp)) {
skipChars(5);
return true;
}
return false;
}
/*
* Helper function which returns true if the first length(q) characters in p are
* the same as the characters in q.
*/
static bool
CharsMatch(const jschar *p, const char *q) {
while (*q) {
if (*p++ != *q++)
return false;
}
return true;
}
bool
TokenStream::getAtLine()
{
int c;
jschar cp[5];
uintN i, line, temp;
char filenameBuf[1024];
/*
* Hack for source filters such as the Mozilla XUL preprocessor:
* "//@line 123\n" sets the number of the *next* line after the
* comment to 123. If we reach here, we've already seen "//".
*/
if (peekChars(5, cp) && CharsMatch(cp, "@line")) {
skipChars(5);
while ((c = getChar()) != '\n' && c != EOF && IsSpaceOrBOM2(c))
continue;
if (JS7_ISDEC(c)) {
line = JS7_UNDEC(c);
while ((c = getChar()) != EOF && JS7_ISDEC(c)) {
temp = 10 * line + JS7_UNDEC(c);
if (temp < line) {
/* Ignore overlarge line numbers. */
return true;
}
line = temp;
}
while (c != '\n' && c != EOF && IsSpaceOrBOM2(c))
c = getChar();
i = 0;
if (c == '"') {
while ((c = getChar()) != EOF && c != '"') {
if (c == '\n') {
ungetChar(c);
return true;
}
if ((c >> 8) != 0 || i >= sizeof filenameBuf - 1)
return true;
filenameBuf[i++] = (char) c;
}
if (c == '"') {
while ((c = getChar()) != '\n' && c != EOF && IsSpaceOrBOM2(c))
continue;
}
}
filenameBuf[i] = '\0';
if (c == EOF || c == '\n') {
if (i > 0) {
if (flags & TSF_OWNFILENAME)
cx->free_((void *) filename);
filename = JS_strdup(cx, filenameBuf);
if (!filename)
return false;
flags |= TSF_OWNFILENAME;
}
lineno = line;
}
}
ungetChar(c);
}
return true;
}
bool
TokenStream::getAtSourceMappingURL()
{
jschar peeked[18];
/* Match comments of the form @sourceMappingURL=<url> */
if (peekChars(18, peeked) && CharsMatch(peeked, "@sourceMappingURL=")) {
skipChars(18);
tokenbuf.clear();
jschar c;
while (!IsSpaceOrBOM2((c = getChar())) &&
c && c != jschar(EOF))
tokenbuf.append(c);
if (tokenbuf.empty())
/* The source map's URL was missing, but not quite an exception that
* we should stop and drop everything for, though. */
return true;
int len = tokenbuf.length();
if (sourceMap)
cx->free_(sourceMap);
sourceMap = (jschar *) cx->malloc_(sizeof(jschar) * (len + 1));
if (!sourceMap)
return false;
for (int i = 0; i < len; i++)
sourceMap[i] = tokenbuf[i];
sourceMap[len] = '\0';
}
return true;
}
Token *
TokenStream::newToken(ptrdiff_t adjust)
{
cursor = (cursor + 1) & ntokensMask;
Token *tp = &tokens[cursor];
tp->ptr = userbuf.addressOfNextRawChar() + adjust;
tp->pos.begin.index = tp->ptr - linebase;
tp->pos.begin.lineno = tp->pos.end.lineno = lineno;
return tp;
}
JS_ALWAYS_INLINE JSAtom *
TokenStream::atomize(JSContext *cx, CharBuffer &cb)
{
return js_AtomizeChars(cx, cb.begin(), cb.length());
}
#ifdef DEBUG
bool
IsTokenSane(Token *tp)
{
/*
* Nb: TOK_EOL should never be used in an actual Token; it should only be
* returned as a TokenKind from peekTokenSameLine().
*/
if (tp->type < TOK_ERROR || tp->type >= TOK_LIMIT || tp->type == TOK_EOL)
return false;
if (tp->pos.begin.lineno == tp->pos.end.lineno) {
if (tp->pos.begin.index > tp->pos.end.index)
return false;
} else {
/* Only certain token kinds can be multi-line. */
switch (tp->type) {
case TOK_STRING:
case TOK_XMLATTR:
case TOK_XMLSPACE:
case TOK_XMLTEXT:
case TOK_XMLCOMMENT:
case TOK_XMLCDATA:
case TOK_XMLPI:
break;
default:
return false;
}
}
return true;
}
#endif
bool
TokenStream::putIdentInTokenbuf(const jschar *identStart)
{
int32 c, qc;
const jschar *tmp = userbuf.addressOfNextRawChar();
userbuf.setAddressOfNextRawChar(identStart);
tokenbuf.clear();
for (;;) {
c = getCharIgnoreEOL();
if (!IsIdentifierPart(c)) {
if (c != '\\' || !matchUnicodeEscapeIdent(&qc))
break;
c = qc;
}
if (!tokenbuf.append(c)) {
userbuf.setAddressOfNextRawChar(tmp);
return false;
}
}
userbuf.setAddressOfNextRawChar(tmp);
return true;
}
enum FirstCharKind {
Other,
OneChar,
Ident,
Dot,
Equals,
String,
Dec,
Colon,
Plus,
HexOct,
/* These two must be last, so that |c >= Space| matches both. */
Space,
EOL
};
#define _______ Other
/*
* OneChar: 40, 41, 44, 59, 63, 91, 93, 123, 125: '(', ')', ',', ';', '?', '[', ']', '{', '}'
* Ident: 36, 65..90, 95, 97..122: '$', 'A'..'Z', '_', 'a'..'z'
* Dot: 46: '.'
* Equals: 61: '='
* String: 34, 39: '"', '\''
* Dec: 49..57: '1'..'9'
* Colon: 58: ':'
* Plus: 43: '+'
* HexOct: 48: '0'
* Space: 9, 11, 12: '\t', '\v', '\f'
* EOL: 10, 13: '\n', '\r'
*/
static const uint8 firstCharKinds[] = {
/* 0 1 2 3 4 5 6 7 8 9 */
/* 0+ */ _______, _______, _______, _______, _______, _______, _______, _______, _______, Space,
/* 10+ */ EOL, Space, Space, EOL, _______, _______, _______, _______, _______, _______,
/* 20+ */ _______, _______, _______, _______, _______, _______, _______, _______, _______, _______,
/* 30+ */ _______, _______, Space, _______, String, _______, Ident, _______, _______, String,
/* 40+ */ OneChar, OneChar, _______, Plus, OneChar, _______, Dot, _______, HexOct, Dec,
/* 50+ */ Dec, Dec, Dec, Dec, Dec, Dec, Dec, Dec, Colon, OneChar,
/* 60+ */ _______, Equals, _______, OneChar, _______, Ident, Ident, Ident, Ident, Ident,
/* 70+ */ Ident, Ident, Ident, Ident, Ident, Ident, Ident, Ident, Ident, Ident,
/* 80+ */ Ident, Ident, Ident, Ident, Ident, Ident, Ident, Ident, Ident, Ident,
/* 90+ */ Ident, OneChar, _______, OneChar, _______, Ident, _______, Ident, Ident, Ident,
/* 100+ */ Ident, Ident, Ident, Ident, Ident, Ident, Ident, Ident, Ident, Ident,
/* 110+ */ Ident, Ident, Ident, Ident, Ident, Ident, Ident, Ident, Ident, Ident,
/* 120+ */ Ident, Ident, Ident, OneChar, _______, OneChar, _______, _______
};
#undef _______
TokenKind
TokenStream::getTokenInternal()
{
TokenKind tt;
int c, qc;
Token *tp;
FirstCharKind c1kind;
const jschar *numStart;
bool hasFracOrExp;
const jschar *identStart;
bool hadUnicodeEscape;
#if JS_HAS_XML_SUPPORT
/*
* Look for XML text and tags.
*/
if (flags & (TSF_XMLTEXTMODE|TSF_XMLTAGMODE)) {
if (!getXMLTextOrTag(&tt, &tp))
goto error;
goto out;
}
#endif
retry:
if (JS_UNLIKELY(!userbuf.hasRawChars())) {
tp = newToken(0);
tt = TOK_EOF;
flags |= TSF_EOF;
goto out;
}
c = userbuf.getRawChar();
JS_ASSERT(c != EOF);
/*
* Chars not in the range 0..127 are rare. Getting them out of the way
* early allows subsequent checking to be faster.
*/
if (JS_UNLIKELY(c >= 128)) {
if (IsSpaceOrBOM2(c)) {
if (c == LINE_SEPARATOR || c == PARA_SEPARATOR) {
updateLineInfoForEOL();
updateFlagsForEOL();
}
goto retry;
}
tp = newToken(-1);
/* '$' and '_' don't pass IsLetter, but they're < 128 so never appear here. */
JS_STATIC_ASSERT('$' < 128 && '_' < 128);
if (IsLetter(c)) {
identStart = userbuf.addressOfNextRawChar() - 1;
hadUnicodeEscape = false;
goto identifier;
}
goto badchar;
}
/*
* Get the token kind, based on the first char. The ordering of c1kind
* comparison is based on the frequency of tokens in real code. Minified
* and non-minified code have different characteristics, mostly in that
* whitespace occurs much less in minified code. Token kinds that fall in
* the 'Other' category typically account for less than 2% of all tokens,
* so their order doesn't matter much.
*/
c1kind = FirstCharKind(firstCharKinds[c]);
/*
* Skip over whitespace chars; update line state on EOLs. Even though
* whitespace isn't very common in minified code we have to handle it first
* (and jump back to 'retry') before calling newToken().
*/
if (c1kind >= Space) {
if (c1kind == EOL) {
/* If it's a \r\n sequence: treat as a single EOL, skip over the \n. */
if (c == '\r' && userbuf.hasRawChars())
userbuf.matchRawChar('\n');
updateLineInfoForEOL();
updateFlagsForEOL();
}
goto retry;
}
tp = newToken(-1);
/*
* Look for an unambiguous single-char token.
*/
if (c1kind == OneChar) {
tt = (TokenKind)oneCharTokens[c];
goto out;
}
/*
* Look for an identifier.
*/
if (c1kind == Ident) {
identStart = userbuf.addressOfNextRawChar() - 1;
hadUnicodeEscape = false;
identifier:
for (;;) {
c = getCharIgnoreEOL();
if (c == EOF)
break;
if (!IsIdentifierPart(c)) {
if (c != '\\' || !matchUnicodeEscapeIdent(&qc))
break;
hadUnicodeEscape = true;
}
}
ungetCharIgnoreEOL(c);
/*
* Check for keywords unless we saw Unicode escape or parser asks
* to ignore keywords.
*/
const KeywordInfo *kw;
if (!hadUnicodeEscape &&
!(flags & TSF_KEYWORD_IS_NAME) &&
(kw = FindKeyword(identStart, userbuf.addressOfNextRawChar() - identStart))) {
if (kw->tokentype == TOK_RESERVED) {
if (!ReportCompileErrorNumber(cx, this, NULL, JSREPORT_ERROR,
JSMSG_RESERVED_ID, kw->chars)) {
goto error;
}
} else if (kw->tokentype == TOK_STRICT_RESERVED) {
if (isStrictMode()
? !ReportStrictModeError(cx, this, NULL, NULL, JSMSG_RESERVED_ID, kw->chars)
: !ReportCompileErrorNumber(cx, this, NULL,
JSREPORT_STRICT | JSREPORT_WARNING,
JSMSG_RESERVED_ID, kw->chars)) {
goto error;
}
} else {
if (kw->version <= versionNumber()) {
tt = kw->tokentype;
tp->t_op = (JSOp) kw->op;
goto out;
}
/*
* let/yield are a Mozilla extension starting in JS1.7. If we
* aren't parsing for a version supporting these extensions,
* conform to ES5 and forbid these names in strict mode.
*/
if ((kw->tokentype == TOK_LET || kw->tokentype == TOK_YIELD) &&
!ReportStrictModeError(cx, this, NULL, NULL, JSMSG_RESERVED_ID, kw->chars))
{
goto error;
}
}
}
/*
* Identifiers containing no Unicode escapes can be atomized directly
* from userbuf. The rest must have the escapes converted via
* tokenbuf before atomizing.
*/
JSAtom *atom;
if (!hadUnicodeEscape)
atom = js_AtomizeChars(cx, identStart, userbuf.addressOfNextRawChar() - identStart);
else if (putIdentInTokenbuf(identStart))
atom = atomize(cx, tokenbuf);
else
atom = NULL;
if (!atom)
goto error;
tp->t_op = JSOP_NAME;
tp->t_atom = atom;
tt = TOK_NAME;
goto out;
}
if (c1kind == Dot) {
c = getCharIgnoreEOL();
if (JS7_ISDEC(c)) {
numStart = userbuf.addressOfNextRawChar() - 2;
goto decimal_dot;
}
#if JS_HAS_XML_SUPPORT
if (c == '.') {
tt = TOK_DBLDOT;
goto out;
}
#endif
ungetCharIgnoreEOL(c);
tt = TOK_DOT;
goto out;
}
if (c1kind == Equals) {
if (matchChar('=')) {
tp->t_op = matchChar('=') ? JSOP_STRICTEQ : JSOP_EQ;
tt = TOK_EQOP;
} else {
tp->t_op = JSOP_NOP;
tt = TOK_ASSIGN;
}
goto out;
}
/*
* Look for a string.
*/
if (c1kind == String) {
qc = c;
tokenbuf.clear();
while (true) {
/*
* We need to detect any of these chars: " or ', \n (or its
* equivalents), \\, EOF. We use maybeStrSpecial[] in a manner
* similar to maybeEOL[], see above. Because we detect EOL
* sequences here and put them back immediately, we can use
* getCharIgnoreEOL().
*/
c = getCharIgnoreEOL();
if (maybeStrSpecial[c & 0xff]) {
if (c == qc)
break;
if (c == '\\') {
switch (c = getChar()) {
case 'b': c = '\b'; break;
case 'f': c = '\f'; break;
case 'n': c = '\n'; break;
case 'r': c = '\r'; break;
case 't': c = '\t'; break;
case 'v': c = '\v'; break;
default:
if ('0' <= c && c < '8') {
int32 val = JS7_UNDEC(c);
c = peekChar();
/* Strict mode code allows only \0, then a non-digit. */
if (val != 0 || JS7_ISDEC(c)) {
if (!ReportStrictModeError(cx, this, NULL, NULL,
JSMSG_DEPRECATED_OCTAL)) {
goto error;
}
setOctalCharacterEscape();
}
if ('0' <= c && c < '8') {
val = 8 * val + JS7_UNDEC(c);
getChar();
c = peekChar();
if ('0' <= c && c < '8') {
int32 save = val;
val = 8 * val + JS7_UNDEC(c);
if (val <= 0377)
getChar();
else
val = save;
}
}
c = (jschar)val;
} else if (c == 'u') {
jschar cp[4];
if (peekChars(4, cp) &&
JS7_ISHEX(cp[0]) && JS7_ISHEX(cp[1]) &&
JS7_ISHEX(cp[2]) && JS7_ISHEX(cp[3])) {
c = (((((JS7_UNHEX(cp[0]) << 4)
+ JS7_UNHEX(cp[1])) << 4)
+ JS7_UNHEX(cp[2])) << 4)
+ JS7_UNHEX(cp[3]);
skipChars(4);
} else {
ReportCompileErrorNumber(cx, this, NULL, JSREPORT_ERROR,
JSMSG_MALFORMED_ESCAPE, "Unicode");
goto error;
}
} else if (c == 'x') {
jschar cp[2];
if (peekChars(2, cp) &&
JS7_ISHEX(cp[0]) && JS7_ISHEX(cp[1])) {
c = (JS7_UNHEX(cp[0]) << 4) + JS7_UNHEX(cp[1]);
skipChars(2);
} else {
ReportCompileErrorNumber(cx, this, NULL, JSREPORT_ERROR,
JSMSG_MALFORMED_ESCAPE, "hexadecimal");
goto error;
}
} else if (c == '\n') {
/*
* ES5 7.8.4: an escaped line terminator represents
* no character.
*/
continue;
}
break;
}
} else if (TokenBuf::isRawEOLChar(c) || c == EOF) {
ungetCharIgnoreEOL(c);
ReportCompileErrorNumber(cx, this, NULL, JSREPORT_ERROR,
JSMSG_UNTERMINATED_STRING);
goto error;
}
}
if (!tokenbuf.append(c))
goto error;
}
JSAtom *atom = atomize(cx, tokenbuf);
if (!atom)
goto error;
tp->pos.end.lineno = lineno;
tp->t_op = JSOP_STRING;
tp->t_atom = atom;
tt = TOK_STRING;
goto out;
}
/*
* Look for a decimal number.
*/
if (c1kind == Dec) {
numStart = userbuf.addressOfNextRawChar() - 1;
decimal:
hasFracOrExp = false;
while (JS7_ISDEC(c))
c = getCharIgnoreEOL();
if (c == '.') {
decimal_dot:
hasFracOrExp = true;
do {
c = getCharIgnoreEOL();
} while (JS7_ISDEC(c));
}
if (c == 'e' || c == 'E') {
hasFracOrExp = true;
c = getCharIgnoreEOL();
if (c == '+' || c == '-')
c = getCharIgnoreEOL();
if (!JS7_ISDEC(c)) {
ungetCharIgnoreEOL(c);
ReportCompileErrorNumber(cx, this, NULL, JSREPORT_ERROR,
JSMSG_MISSING_EXPONENT);
goto error;
}
do {
c = getCharIgnoreEOL();
} while (JS7_ISDEC(c));
}
ungetCharIgnoreEOL(c);
if (c != EOF && IsIdentifierStart(c)) {
ReportCompileErrorNumber(cx, this, NULL, JSREPORT_ERROR, JSMSG_IDSTART_AFTER_NUMBER);
goto error;
}
/*
* Unlike identifiers and strings, numbers cannot contain escaped
* chars, so we don't need to use tokenbuf. Instead we can just
* convert the jschars in userbuf directly to the numeric value.
*/
jsdouble dval;
const jschar *dummy;
if (!hasFracOrExp) {
if (!GetPrefixInteger(cx, numStart, userbuf.addressOfNextRawChar(), 10, &dummy, &dval))
goto error;
} else {
if (!js_strtod(cx, numStart, userbuf.addressOfNextRawChar(), &dummy, &dval))
goto error;
}
tp->t_dval = dval;
tt = TOK_NUMBER;
goto out;
}
if (c1kind == Colon) {
#if JS_HAS_XML_SUPPORT
if (matchChar(':')) {
tt = TOK_DBLCOLON;
goto out;
}
#endif
tp->t_op = JSOP_NOP;
tt = TOK_COLON;
goto out;
}
if (c1kind == Plus) {
if (matchChar('=')) {
tp->t_op = JSOP_ADD;
tt = TOK_ASSIGN;
} else if (matchChar('+')) {
tt = TOK_INC;
} else {
tp->t_op = JSOP_POS;
tt = TOK_PLUS;
}
goto out;
}
/*
* Look for a hexadecimal or octal number.
*/
if (c1kind == HexOct) {
int radix;
c = getCharIgnoreEOL();
if (c == 'x' || c == 'X') {
radix = 16;
c = getCharIgnoreEOL();
if (!JS7_ISHEX(c)) {
ungetCharIgnoreEOL(c);
ReportCompileErrorNumber(cx, this, NULL, JSREPORT_ERROR, JSMSG_MISSING_HEXDIGITS);
goto error;
}
numStart = userbuf.addressOfNextRawChar() - 1; /* one past the '0x' */
while (JS7_ISHEX(c))
c = getCharIgnoreEOL();
} else if (JS7_ISDEC(c)) {
radix = 8;
numStart = userbuf.addressOfNextRawChar() - 1; /* one past the '0' */
while (JS7_ISDEC(c)) {
/* Octal integer literals are not permitted in strict mode code. */
if (!ReportStrictModeError(cx, this, NULL, NULL, JSMSG_DEPRECATED_OCTAL))
goto error;
/*
* Outside strict mode, we permit 08 and 09 as decimal numbers,
* which makes our behaviour a superset of the ECMA numeric
* grammar. We might not always be so permissive, so we warn
* about it.
*/
if (c >= '8') {
if (!ReportCompileErrorNumber(cx, this, NULL, JSREPORT_WARNING,
JSMSG_BAD_OCTAL, c == '8' ? "08" : "09")) {
goto error;
}
goto decimal; /* use the decimal scanner for the rest of the number */
}
c = getCharIgnoreEOL();
}
} else {
/* '0' not followed by 'x', 'X' or a digit; scan as a decimal number. */
numStart = userbuf.addressOfNextRawChar() - 1;
goto decimal;
}
ungetCharIgnoreEOL(c);
if (c != EOF && IsIdentifierStart(c)) {
ReportCompileErrorNumber(cx, this, NULL, JSREPORT_ERROR, JSMSG_IDSTART_AFTER_NUMBER);
goto error;
}
jsdouble dval;
const jschar *dummy;
if (!GetPrefixInteger(cx, numStart, userbuf.addressOfNextRawChar(), radix, &dummy, &dval))
goto error;
tp->t_dval = dval;
tt = TOK_NUMBER;
goto out;
}
/*
* This handles everything else.
*/
JS_ASSERT(c1kind == Other);
switch (c) {
case '\\':
hadUnicodeEscape = matchUnicodeEscapeIdStart(&qc);
if (hadUnicodeEscape) {
c = qc;
identStart = userbuf.addressOfNextRawChar() - 6;
goto identifier;
}
goto badchar;
case '|':
if (matchChar(c)) {
tt = TOK_OR;
} else if (matchChar('=')) {
tp->t_op = JSOP_BITOR;
tt = TOK_ASSIGN;
} else {
tt = TOK_BITOR;
}
break;
case '^':
if (matchChar('=')) {
tp->t_op = JSOP_BITXOR;
tt = TOK_ASSIGN;
} else {
tt = TOK_BITXOR;
}
break;
case '&':
if (matchChar(c)) {
tt = TOK_AND;
} else if (matchChar('=')) {
tp->t_op = JSOP_BITAND;
tt = TOK_ASSIGN;
} else {
tt = TOK_BITAND;
}
break;
case '!':
if (matchChar('=')) {
tp->t_op = matchChar('=') ? JSOP_STRICTNE : JSOP_NE;
tt = TOK_EQOP;
} else {
tp->t_op = JSOP_NOT;
tt = TOK_UNARYOP;
}
break;
#if JS_HAS_XML_SUPPORT
case '@':
tt = TOK_AT;
break;
#endif
case '<':
#if JS_HAS_XML_SUPPORT
if ((flags & TSF_OPERAND) && (hasXML() || peekChar() != '!')) {
if (!getXMLMarkup(&tt, &tp))
goto error;
goto out;
}
#endif
/* NB: treat HTML begin-comment as comment-till-end-of-line */
if (matchChar('!')) {
if (matchChar('-')) {
if (matchChar('-')) {
flags |= TSF_IN_HTML_COMMENT;
goto skipline;
}
ungetChar('-');
}
ungetChar('!');
}
if (matchChar(c)) {
tp->t_op = JSOP_LSH;
tt = matchChar('=') ? TOK_ASSIGN : TOK_SHOP;
} else {
tp->t_op = matchChar('=') ? JSOP_LE : JSOP_LT;
tt = TOK_RELOP;
}
break;
case '>':
if (matchChar(c)) {
tp->t_op = matchChar(c) ? JSOP_URSH : JSOP_RSH;
tt = matchChar('=') ? TOK_ASSIGN : TOK_SHOP;
} else {
tp->t_op = matchChar('=') ? JSOP_GE : JSOP_GT;
tt = TOK_RELOP;
}
break;
case '*':
tp->t_op = JSOP_MUL;
tt = matchChar('=') ? TOK_ASSIGN : TOK_STAR;
break;
case '/':
/*
* Look for a single-line comment.
*/
if (matchChar('/')) {
if (cx->hasAtLineOption() && !getAtLine())
goto error;
if (!getAtSourceMappingURL())
goto error;
skipline:
/* Optimize line skipping if we are not in an HTML comment. */
if (flags & TSF_IN_HTML_COMMENT) {
while ((c = getChar()) != EOF && c != '\n') {
if (c == '-' && matchChar('-') && matchChar('>'))
flags &= ~TSF_IN_HTML_COMMENT;
}
} else {
while ((c = getChar()) != EOF && c != '\n')
continue;
}
ungetChar(c);
cursor = (cursor - 1) & ntokensMask;
goto retry;
}
/*
* Look for a multi-line comment.
*/
if (matchChar('*')) {
uintN linenoBefore = lineno;
while ((c = getChar()) != EOF &&
!(c == '*' && matchChar('/'))) {
/* Ignore all characters until comment close. */
}
if (c == EOF) {
ReportCompileErrorNumber(cx, this, NULL, JSREPORT_ERROR,
JSMSG_UNTERMINATED_COMMENT);
goto error;
}
if (linenoBefore != lineno)
updateFlagsForEOL();
cursor = (cursor - 1) & ntokensMask;
goto retry;
}
/*
* Look for a regexp.
*/
if (flags & TSF_OPERAND) {
uintN reflags, length;
JSBool inCharClass = JS_FALSE;
tokenbuf.clear();
for (;;) {
c = getChar();
if (c == '\\') {
if (!tokenbuf.append(c))
goto error;
c = getChar();
} else if (c == '[') {
inCharClass = JS_TRUE;
} else if (c == ']') {
inCharClass = JS_FALSE;
} else if (c == '/' && !inCharClass) {
/* For compat with IE, allow unescaped / in char classes. */
break;
}
if (c == '\n' || c == EOF) {
ungetChar(c);
ReportCompileErrorNumber(cx, this, NULL, JSREPORT_ERROR,
JSMSG_UNTERMINATED_REGEXP);
goto error;
}
if (!tokenbuf.append(c))
goto error;
}
for (reflags = 0, length = tokenbuf.length() + 1; ; length++) {
c = peekChar();
if (c == 'g' && !(reflags & JSREG_GLOB))
reflags |= JSREG_GLOB;
else if (c == 'i' && !(reflags & IgnoreCaseFlag))
reflags |= IgnoreCaseFlag;
else if (c == 'm' && !(reflags & MultilineFlag))
reflags |= MultilineFlag;
else if (c == 'y' && !(reflags & StickyFlag))
reflags |= StickyFlag;
else
break;
getChar();
}
c = peekChar();
if (JS7_ISLET(c)) {
char buf[2] = { '\0' };
tp->pos.begin.index += length + 1;
buf[0] = (char)c;
ReportCompileErrorNumber(cx, this, NULL, JSREPORT_ERROR, JSMSG_BAD_REGEXP_FLAG,
buf);
(void) getChar();
goto error;
}
tp->t_reflags = reflags;
tt = TOK_REGEXP;
break;
}
tp->t_op = JSOP_DIV;
tt = matchChar('=') ? TOK_ASSIGN : TOK_DIVOP;
break;
case '%':
tp->t_op = JSOP_MOD;
tt = matchChar('=') ? TOK_ASSIGN : TOK_DIVOP;
break;
case '~':
tp->t_op = JSOP_BITNOT;
tt = TOK_UNARYOP;
break;
case '-':
if (matchChar('=')) {
tp->t_op = JSOP_SUB;
tt = TOK_ASSIGN;
} else if (matchChar(c)) {
if (peekChar() == '>' && !(flags & TSF_DIRTYLINE)) {
flags &= ~TSF_IN_HTML_COMMENT;
goto skipline;
}
tt = TOK_DEC;
} else {
tp->t_op = JSOP_NEG;
tt = TOK_MINUS;
}
break;
#if JS_HAS_SHARP_VARS
case '#':
{
uint32 n;
c = getCharIgnoreEOL();
if (!JS7_ISDEC(c)) {
ungetCharIgnoreEOL(c);
goto badchar;
}
n = (uint32)JS7_UNDEC(c);
for (;;) {
c = getChar();
if (!JS7_ISDEC(c))
break;
n = 10 * n + JS7_UNDEC(c);
if (n >= UINT16_LIMIT) {
ReportCompileErrorNumber(cx, this, NULL, JSREPORT_ERROR, JSMSG_SHARPVAR_TOO_BIG);
goto error;
}
}
tp->t_dval = (jsdouble) n;
if (cx->hasStrictOption() &&
(c == '=' || c == '#')) {
char buf[20];
JS_snprintf(buf, sizeof buf, "#%u%c", n, c);
if (!ReportCompileErrorNumber(cx, this, NULL, JSREPORT_WARNING | JSREPORT_STRICT,
JSMSG_DEPRECATED_USAGE, buf)) {
goto error;
}
}
if (c == '=')
tt = TOK_DEFSHARP;
else if (c == '#')
tt = TOK_USESHARP;
else
goto badchar;
break;
}
#endif /* JS_HAS_SHARP_VARS */
badchar:
default:
ReportCompileErrorNumber(cx, this, NULL, JSREPORT_ERROR, JSMSG_ILLEGAL_CHARACTER);
goto error;
}
out:
flags |= TSF_DIRTYLINE;
tp->pos.end.index = userbuf.addressOfNextRawChar() - linebase;
tp->type = tt;
JS_ASSERT(IsTokenSane(tp));
return tt;
error:
/*
* For erroneous multi-line tokens we won't have changed end.lineno (it'll
* still be equal to begin.lineno) so we revert end.index to be equal to
* begin.index + 1 (as if it's a 1-char token) to avoid having inconsistent
* begin/end positions. end.index isn't used in error messages anyway.
*/
flags |= TSF_DIRTYLINE;
tp->pos.end.index = tp->pos.begin.index + 1;
tp->type = TOK_ERROR;
JS_ASSERT(IsTokenSane(tp));
#ifdef DEBUG
/*
* Poisoning userbuf on error establishes an invariant: once an erroneous
* token has been seen, userbuf will not be consulted again. This is true
* because the parser will either (a) deal with the TOK_ERROR token by
* aborting parsing immediately; or (b) if the TOK_ERROR token doesn't
* match what it expected, it will unget the token, and the next getToken()
* call will immediately return the just-gotten TOK_ERROR token again
* without consulting userbuf, thanks to the lookahead buffer.
*/
userbuf.poison();
#endif
return TOK_ERROR;
}
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