gecko-dev/layout/style/nsCSSScanner.cpp

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Исходник Ответственный История

Этот файл содержит невидимые символы Юникода!

Этот файл содержит невидимые символы Юникода, которые могут быть отображены не так, как показано ниже. Если это намеренно, можете спокойно проигнорировать это предупреждение. Используйте кнопку Экранировать, чтобы показать скрытые символы.

Этот файл содержит неоднозначные символы Юникода, которые могут быть перепутаны с другими в текущей локали. Если это намеренно, можете спокойно проигнорировать это предупреждение. Используйте кнопку Экранировать, чтобы подсветить эти символы.

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** 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.org code.
*
* 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):
* L. David Baron <dbaron@dbaron.org>
* Daniel Glazman <glazman@netscape.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 ***** */
#include <math.h>
/* tokenization of CSS style sheets */
#include "nsCSSScanner.h"
#include "nsIFactory.h"
#include "nsIInputStream.h"
#include "nsIUnicharInputStream.h"
#include "nsString.h"
#include "nsCRT.h"
// for #ifdef CSS_REPORT_PARSE_ERRORS
#include "nsCOMPtr.h"
#include "nsIServiceManager.h"
#include "nsIComponentManager.h"
#include "nsReadableUtils.h"
#include "nsIURI.h"
#include "nsIConsoleService.h"
#include "nsIScriptError.h"
#include "nsIStringBundle.h"
#include "nsContentUtils.h"
#include "mozilla/Services.h"
#ifdef CSS_REPORT_PARSE_ERRORS
static PRBool gReportErrors = PR_TRUE;
static nsIConsoleService *gConsoleService;
static nsIFactory *gScriptErrorFactory;
static nsIStringBundle *gStringBundle;
#endif
// Don't bother collecting whitespace characters in token's mIdent buffer
#undef COLLECT_WHITESPACE
// Table of character classes
static const PRUnichar CSS_ESCAPE = PRUnichar('\\');
static const PRUint8 IS_HEX_DIGIT = 0x01;
static const PRUint8 START_IDENT = 0x02;
static const PRUint8 IS_IDENT = 0x04;
static const PRUint8 IS_WHITESPACE = 0x08;
#define W IS_WHITESPACE
#define I IS_IDENT
#define S START_IDENT
#define SI IS_IDENT|START_IDENT
#define XI IS_IDENT |IS_HEX_DIGIT
#define XSI IS_IDENT|START_IDENT|IS_HEX_DIGIT
static const PRUint8 gLexTable[256] = {
// TAB LF FF CR
0, 0, 0, 0, 0, 0, 0, 0, 0, W, W, 0, W, W, 0, 0,
//
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
// SPC ! " # $ % & ' ( ) * + , - . /
W, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, I, 0, 0,
// 0 1 2 3 4 5 6 7 8 9 : ; < = > ?
XI, XI, XI, XI, XI, XI, XI, XI, XI, XI, 0, 0, 0, 0, 0, 0,
// @ A B C D E F G H I J K L M N O
0, XSI,XSI,XSI,XSI,XSI,XSI,SI, SI, SI, SI, SI, SI, SI, SI, SI,
// P Q R S T U V W X Y Z [ \ ] ^ _
SI, SI, SI, SI, SI, SI, SI, SI, SI, SI, SI, 0, S, 0, 0, SI,
// ` a b c d e f g h i j k l m n o
0, XSI,XSI,XSI,XSI,XSI,XSI,SI, SI, SI, SI, SI, SI, SI, SI, SI,
// p q r s t u v w x y z { | } ~
SI, SI, SI, SI, SI, SI, SI, SI, SI, SI, SI, 0, 0, 0, 0, 0,
//
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
//
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
// ¡ ¢ £ ¤ ¥ ¦ § ¨ © ª « ¬ ­ ® ¯
0, SI, SI, SI, SI, SI, SI, SI, SI, SI, SI, SI, SI, SI, SI, SI,
// ° ± ² ³ ´ µ ¶ · ¸ ¹ º » ¼ ½ ¾ ¿
SI, SI, SI, SI, SI, SI, SI, SI, SI, SI, SI, SI, SI, SI, SI, SI,
// À Á Â Ã Ä Å Æ Ç È É Ê Ë Ì Í Î Ï
SI, SI, SI, SI, SI, SI, SI, SI, SI, SI, SI, SI, SI, SI, SI, SI,
// Ð Ñ Ò Ó Ô Õ Ö × Ø Ù Ú Û Ü Ý Þ ß
SI, SI, SI, SI, SI, SI, SI, SI, SI, SI, SI, SI, SI, SI, SI, SI,
// à á â ã ä å æ ç è é ê ë ì í î ï
SI, SI, SI, SI, SI, SI, SI, SI, SI, SI, SI, SI, SI, SI, SI, SI,
// ð ñ ò ó ô õ ö ÷ ø ù ú û ü ý þ ÿ
SI, SI, SI, SI, SI, SI, SI, SI, SI, SI, SI, SI, SI, SI, SI, SI,
};
#undef W
#undef S
#undef I
#undef XI
#undef SI
#undef XSI
static inline PRBool
IsIdentStart(PRInt32 aChar)
{
return aChar >= 0 &&
(aChar >= 256 || (gLexTable[aChar] & START_IDENT) != 0);
}
static inline PRBool
StartsIdent(PRInt32 aFirstChar, PRInt32 aSecondChar)
{
return IsIdentStart(aFirstChar) ||
(aFirstChar == '-' && IsIdentStart(aSecondChar));
}
static inline PRBool
IsWhitespace(PRInt32 ch) {
return PRUint32(ch) < 256 && (gLexTable[ch] & IS_WHITESPACE) != 0;
}
static inline PRBool
IsDigit(PRInt32 ch) {
return (ch >= '0') && (ch <= '9');
}
static inline PRBool
IsHexDigit(PRInt32 ch) {
return PRUint32(ch) < 256 && (gLexTable[ch] & IS_HEX_DIGIT) != 0;
}
static inline PRBool
IsIdent(PRInt32 ch) {
return ch >= 0 && (ch >= 256 || (gLexTable[ch] & IS_IDENT) != 0);
}
static inline PRUint32
DecimalDigitValue(PRInt32 ch)
{
return ch - '0';
}
static inline PRUint32
HexDigitValue(PRInt32 ch)
{
if (IsDigit(ch)) {
return DecimalDigitValue(ch);
} else {
// Note: c&7 just keeps the low three bits which causes
// upper and lower case alphabetics to both yield their
// "relative to 10" value for computing the hex value.
return (ch & 0x7) + 9;
}
}
nsCSSToken::nsCSSToken()
{
mType = eCSSToken_Symbol;
}
void
nsCSSToken::AppendToString(nsString& aBuffer)
{
switch (mType) {
case eCSSToken_AtKeyword:
aBuffer.Append(PRUnichar('@')); // fall through intentional
case eCSSToken_Ident:
case eCSSToken_WhiteSpace:
case eCSSToken_Function:
case eCSSToken_URL:
case eCSSToken_InvalidURL:
case eCSSToken_HTMLComment:
case eCSSToken_URange:
aBuffer.Append(mIdent);
if (mType == eCSSToken_Function)
aBuffer.Append(PRUnichar('('));
break;
case eCSSToken_Number:
if (mIntegerValid) {
aBuffer.AppendInt(mInteger, 10);
}
else {
aBuffer.AppendFloat(mNumber);
}
break;
case eCSSToken_Percentage:
NS_ASSERTION(!mIntegerValid, "How did a percentage token get this set?");
aBuffer.AppendFloat(mNumber * 100.0f);
aBuffer.Append(PRUnichar('%')); // STRING USE WARNING: technically, this should be |AppendWithConversion|
break;
case eCSSToken_Dimension:
if (mIntegerValid) {
aBuffer.AppendInt(mInteger, 10);
}
else {
aBuffer.AppendFloat(mNumber);
}
aBuffer.Append(mIdent);
break;
case eCSSToken_String:
aBuffer.Append(mSymbol);
aBuffer.Append(mIdent); // fall through intentional
case eCSSToken_Symbol:
aBuffer.Append(mSymbol);
break;
case eCSSToken_ID:
case eCSSToken_Ref:
aBuffer.Append(PRUnichar('#'));
aBuffer.Append(mIdent);
break;
case eCSSToken_Includes:
aBuffer.AppendLiteral("~=");
break;
case eCSSToken_Dashmatch:
aBuffer.AppendLiteral("|=");
break;
case eCSSToken_Beginsmatch:
aBuffer.AppendLiteral("^=");
break;
case eCSSToken_Endsmatch:
aBuffer.AppendLiteral("$=");
break;
case eCSSToken_Containsmatch:
aBuffer.AppendLiteral("*=");
break;
case eCSSToken_Error:
aBuffer.Append(mSymbol);
aBuffer.Append(mIdent);
break;
default:
NS_ERROR("invalid token type");
break;
}
}
nsCSSScanner::nsCSSScanner()
: mInputStream(nsnull)
, mReadPointer(nsnull)
, mLowLevelError(NS_OK)
#ifdef MOZ_SVG
, mSVGMode(PR_FALSE)
#endif
#ifdef CSS_REPORT_PARSE_ERRORS
, mError(mErrorBuf, NS_ARRAY_LENGTH(mErrorBuf), 0)
#endif
{
MOZ_COUNT_CTOR(nsCSSScanner);
mPushback = mLocalPushback;
mPushbackSize = NS_ARRAY_LENGTH(mLocalPushback);
// No need to init the other members, since they represent state
// which can get cleared. We'll init them every time Init() is
// called.
}
nsCSSScanner::~nsCSSScanner()
{
MOZ_COUNT_DTOR(nsCSSScanner);
Close();
if (mLocalPushback != mPushback) {
delete [] mPushback;
}
}
nsresult
nsCSSScanner::GetLowLevelError()
{
return mLowLevelError;
}
void
nsCSSScanner::SetLowLevelError(nsresult aErrorCode)
{
NS_ASSERTION(aErrorCode != NS_OK, "SetLowLevelError() used to clear error");
NS_ASSERTION(mLowLevelError == NS_OK, "there is already a low-level error");
mLowLevelError = aErrorCode;
}
#ifdef CSS_REPORT_PARSE_ERRORS
#define CSS_ERRORS_PREF "layout.css.report_errors"
static int
CSSErrorsPrefChanged(const char *aPref, void *aClosure)
{
gReportErrors = nsContentUtils::GetBoolPref(CSS_ERRORS_PREF, PR_TRUE);
return NS_OK;
}
#endif
/* static */ PRBool
nsCSSScanner::InitGlobals()
{
#ifdef CSS_REPORT_PARSE_ERRORS
if (gConsoleService && gScriptErrorFactory)
return PR_TRUE;
nsresult rv = CallGetService(NS_CONSOLESERVICE_CONTRACTID, &gConsoleService);
NS_ENSURE_SUCCESS(rv, PR_FALSE);
rv = CallGetClassObject(NS_SCRIPTERROR_CONTRACTID, &gScriptErrorFactory);
NS_ENSURE_SUCCESS(rv, PR_FALSE);
NS_ASSERTION(gConsoleService && gScriptErrorFactory,
"unexpected null pointer without failure");
nsContentUtils::RegisterPrefCallback(CSS_ERRORS_PREF, CSSErrorsPrefChanged, nsnull);
CSSErrorsPrefChanged(CSS_ERRORS_PREF, nsnull);
#endif
return PR_TRUE;
}
/* static */ void
nsCSSScanner::ReleaseGlobals()
{
#ifdef CSS_REPORT_PARSE_ERRORS
nsContentUtils::UnregisterPrefCallback(CSS_ERRORS_PREF, CSSErrorsPrefChanged, nsnull);
NS_IF_RELEASE(gConsoleService);
NS_IF_RELEASE(gScriptErrorFactory);
NS_IF_RELEASE(gStringBundle);
#endif
}
void
nsCSSScanner::Init(nsIUnicharInputStream* aInput,
const PRUnichar * aBuffer, PRUint32 aCount,
nsIURI* aURI, PRUint32 aLineNumber)
{
NS_PRECONDITION(!mInputStream, "Should not have an existing input stream!");
NS_PRECONDITION(!mReadPointer, "Should not have an existing input buffer!");
// Read from stream via my own buffer
if (aInput) {
NS_PRECONDITION(!aBuffer, "Shouldn't have both input and buffer!");
NS_PRECONDITION(aCount == 0, "Shouldn't have count with a stream");
mInputStream = aInput;
mReadPointer = mBuffer;
mCount = 0;
} else {
NS_PRECONDITION(aBuffer, "Either aInput or aBuffer must be set");
// Read directly from the provided buffer
mInputStream = nsnull;
mReadPointer = aBuffer;
mCount = aCount;
}
#ifdef CSS_REPORT_PARSE_ERRORS
// If aURI is the same as mURI, no need to reget mFileName -- it
// shouldn't have changed.
if (aURI != mURI) {
mURI = aURI;
if (aURI) {
aURI->GetSpec(mFileName);
} else {
mFileName.Adopt(NS_strdup("from DOM"));
}
}
#endif // CSS_REPORT_PARSE_ERRORS
mLineNumber = aLineNumber;
// Reset variables that we use to keep track of our progress through the input
mOffset = 0;
mPushbackCount = 0;
mLowLevelError = NS_OK;
#ifdef CSS_REPORT_PARSE_ERRORS
mColNumber = 0;
#endif
}
#ifdef CSS_REPORT_PARSE_ERRORS
// @see REPORT_UNEXPECTED_EOF in nsCSSParser.cpp
#define REPORT_UNEXPECTED_EOF(lf_) \
ReportUnexpectedEOF(#lf_)
void
nsCSSScanner::AddToError(const nsSubstring& aErrorText)
{
if (mError.IsEmpty()) {
mErrorLineNumber = mLineNumber;
mErrorColNumber = mColNumber;
mError = aErrorText;
} else {
mError.Append(NS_LITERAL_STRING(" ") + aErrorText);
}
}
void
nsCSSScanner::ClearError()
{
mError.Truncate();
}
void
nsCSSScanner::OutputError()
{
if (mError.IsEmpty()) return;
// Log it to the Error console
if (InitGlobals() && gReportErrors) {
nsresult rv;
nsCOMPtr<nsIScriptError> errorObject =
do_CreateInstance(gScriptErrorFactory, &rv);
if (NS_SUCCEEDED(rv)) {
rv = errorObject->Init(mError.get(),
NS_ConvertUTF8toUTF16(mFileName).get(),
EmptyString().get(),
mErrorLineNumber,
mErrorColNumber,
nsIScriptError::warningFlag,
"CSS Parser");
if (NS_SUCCEEDED(rv))
gConsoleService->LogMessage(errorObject);
}
}
ClearError();
}
static PRBool
InitStringBundle()
{
if (gStringBundle)
return PR_TRUE;
nsCOMPtr<nsIStringBundleService> sbs =
mozilla::services::GetStringBundleService();
if (!sbs)
return PR_FALSE;
nsresult rv =
sbs->CreateBundle("chrome://global/locale/css.properties", &gStringBundle);
if (NS_FAILED(rv)) {
gStringBundle = nsnull;
return PR_FALSE;
}
return PR_TRUE;
}
#define ENSURE_STRINGBUNDLE \
PR_BEGIN_MACRO if (!InitStringBundle()) return; PR_END_MACRO
// aMessage must take no parameters
void nsCSSScanner::ReportUnexpected(const char* aMessage)
{
ENSURE_STRINGBUNDLE;
nsXPIDLString str;
gStringBundle->GetStringFromName(NS_ConvertASCIItoUTF16(aMessage).get(),
getter_Copies(str));
AddToError(str);
}
void
nsCSSScanner::ReportUnexpectedParams(const char* aMessage,
const PRUnichar **aParams,
PRUint32 aParamsLength)
{
NS_PRECONDITION(aParamsLength > 0, "use the non-params version");
ENSURE_STRINGBUNDLE;
nsXPIDLString str;
gStringBundle->FormatStringFromName(NS_ConvertASCIItoUTF16(aMessage).get(),
aParams, aParamsLength,
getter_Copies(str));
AddToError(str);
}
// aLookingFor is a plain string, not a format string
void
nsCSSScanner::ReportUnexpectedEOF(const char* aLookingFor)
{
ENSURE_STRINGBUNDLE;
nsXPIDLString innerStr;
gStringBundle->GetStringFromName(NS_ConvertASCIItoUTF16(aLookingFor).get(),
getter_Copies(innerStr));
const PRUnichar *params[] = {
innerStr.get()
};
nsXPIDLString str;
gStringBundle->FormatStringFromName(NS_LITERAL_STRING("PEUnexpEOF2").get(),
params, NS_ARRAY_LENGTH(params),
getter_Copies(str));
AddToError(str);
}
// aLookingFor is a single character
void
nsCSSScanner::ReportUnexpectedEOF(PRUnichar aLookingFor)
{
ENSURE_STRINGBUNDLE;
const PRUnichar lookingForStr[] = {
PRUnichar('\''), aLookingFor, PRUnichar('\''), PRUnichar(0)
};
const PRUnichar *params[] = { lookingForStr };
nsXPIDLString str;
gStringBundle->FormatStringFromName(NS_LITERAL_STRING("PEUnexpEOF2").get(),
params, NS_ARRAY_LENGTH(params),
getter_Copies(str));
AddToError(str);
}
// aMessage must take 1 parameter (for the string representation of the
// unexpected token)
void
nsCSSScanner::ReportUnexpectedToken(nsCSSToken& tok,
const char *aMessage)
{
ENSURE_STRINGBUNDLE;
nsAutoString tokenString;
tok.AppendToString(tokenString);
const PRUnichar *params[] = {
tokenString.get()
};
ReportUnexpectedParams(aMessage, params, NS_ARRAY_LENGTH(params));
}
// aParams's first entry must be null, and we'll fill in the token
void
nsCSSScanner::ReportUnexpectedTokenParams(nsCSSToken& tok,
const char* aMessage,
const PRUnichar **aParams,
PRUint32 aParamsLength)
{
NS_PRECONDITION(aParamsLength > 1, "use the non-params version");
NS_PRECONDITION(aParams[0] == nsnull, "first param should be empty");
ENSURE_STRINGBUNDLE;
nsAutoString tokenString;
tok.AppendToString(tokenString);
aParams[0] = tokenString.get();
ReportUnexpectedParams(aMessage, aParams, aParamsLength);
}
#else
#define REPORT_UNEXPECTED_EOF(lf_)
#endif // CSS_REPORT_PARSE_ERRORS
void
nsCSSScanner::Close()
{
mInputStream = nsnull;
mReadPointer = nsnull;
// Clean things up so we don't hold on to memory if our parser gets recycled.
#ifdef CSS_REPORT_PARSE_ERRORS
mFileName.Truncate();
mURI = nsnull;
mError.Truncate();
#endif
if (mPushback != mLocalPushback) {
delete [] mPushback;
mPushback = mLocalPushback;
mPushbackSize = NS_ARRAY_LENGTH(mLocalPushback);
}
}
#ifdef CSS_REPORT_PARSE_ERRORS
#define TAB_STOP_WIDTH 8
#endif
PRBool
nsCSSScanner::EnsureData()
{
if (mOffset < mCount)
return PR_TRUE;
if (!mInputStream)
return PR_FALSE;
mOffset = 0;
nsresult rv = mInputStream->Read(mBuffer, CSS_BUFFER_SIZE, &mCount);
if (NS_FAILED(rv)) {
mCount = 0;
SetLowLevelError(rv);
return PR_FALSE;
}
return mCount > 0;
}
// Returns -1 on error or eof
PRInt32
nsCSSScanner::Read()
{
PRInt32 rv;
if (0 < mPushbackCount) {
rv = PRInt32(mPushback[--mPushbackCount]);
} else {
if (mOffset == mCount && !EnsureData()) {
return -1;
}
rv = PRInt32(mReadPointer[mOffset++]);
// There are four types of newlines in CSS: "\r", "\n", "\r\n", and "\f".
// To simplify dealing with newlines, they are all normalized to "\n" here
if (rv == '\r') {
if (EnsureData() && mReadPointer[mOffset] == '\n') {
mOffset++;
}
rv = '\n';
} else if (rv == '\f') {
rv = '\n';
}
if (rv == '\n') {
// 0 is a magical line number meaning that we don't know (i.e., script)
if (mLineNumber != 0)
++mLineNumber;
#ifdef CSS_REPORT_PARSE_ERRORS
mColNumber = 0;
#endif
}
#ifdef CSS_REPORT_PARSE_ERRORS
else if (rv == '\t') {
mColNumber = ((mColNumber - 1 + TAB_STOP_WIDTH) / TAB_STOP_WIDTH)
* TAB_STOP_WIDTH;
} else if (rv != '\n') {
mColNumber++;
}
#endif
}
//printf("Read => %x\n", rv);
return rv;
}
PRInt32
nsCSSScanner::Peek()
{
if (0 == mPushbackCount) {
PRInt32 ch = Read();
if (ch < 0) {
return -1;
}
mPushback[0] = PRUnichar(ch);
mPushbackCount++;
}
//printf("Peek => %x\n", mLookAhead);
return PRInt32(mPushback[mPushbackCount - 1]);
}
void
nsCSSScanner::Pushback(PRUnichar aChar)
{
if (mPushbackCount == mPushbackSize) { // grow buffer
PRUnichar* newPushback = new PRUnichar[mPushbackSize + 4];
if (nsnull == newPushback) {
return;
}
mPushbackSize += 4;
memcpy(newPushback, mPushback, sizeof(PRUnichar) * mPushbackCount);
if (mPushback != mLocalPushback) {
delete [] mPushback;
}
mPushback = newPushback;
}
mPushback[mPushbackCount++] = aChar;
}
PRBool
nsCSSScanner::LookAhead(PRUnichar aChar)
{
PRInt32 ch = Read();
if (ch < 0) {
return PR_FALSE;
}
if (ch == aChar) {
return PR_TRUE;
}
Pushback(ch);
return PR_FALSE;
}
void
nsCSSScanner::EatWhiteSpace()
{
for (;;) {
PRInt32 ch = Read();
if (ch < 0) {
break;
}
if ((ch != ' ') && (ch != '\n') && (ch != '\t')) {
Pushback(ch);
break;
}
}
}
PRBool
nsCSSScanner::Next(nsCSSToken& aToken)
{
for (;;) { // Infinite loop so we can restart after comments.
PRInt32 ch = Read();
if (ch < 0) {
return PR_FALSE;
}
// UNICODE-RANGE
if ((ch == 'u' || ch == 'U') && Peek() == '+')
return ParseURange(ch, aToken);
// IDENT
if (StartsIdent(ch, Peek()))
return ParseIdent(ch, aToken);
// AT_KEYWORD
if (ch == '@') {
PRInt32 nextChar = Read();
if (nextChar >= 0) {
PRInt32 followingChar = Peek();
Pushback(nextChar);
if (StartsIdent(nextChar, followingChar))
return ParseAtKeyword(ch, aToken);
}
}
// NUMBER or DIM
if ((ch == '.') || (ch == '+') || (ch == '-')) {
PRInt32 nextChar = Peek();
if (IsDigit(nextChar)) {
return ParseNumber(ch, aToken);
}
else if (('.' == nextChar) && ('.' != ch)) {
nextChar = Read();
PRInt32 followingChar = Peek();
Pushback(nextChar);
if (IsDigit(followingChar))
return ParseNumber(ch, aToken);
}
}
if (IsDigit(ch)) {
return ParseNumber(ch, aToken);
}
// ID
if (ch == '#') {
return ParseRef(ch, aToken);
}
// STRING
if ((ch == '"') || (ch == '\'')) {
return ParseString(ch, aToken);
}
// WS
if (IsWhitespace(ch)) {
aToken.mType = eCSSToken_WhiteSpace;
aToken.mIdent.Assign(PRUnichar(ch));
EatWhiteSpace();
return PR_TRUE;
}
if (ch == '/') {
PRInt32 nextChar = Peek();
if (nextChar == '*') {
(void) Read();
#if 0
// If we change our storage data structures such that comments are
// stored (for Editor), we should reenable this code, condition it
// on being in editor mode, and apply glazou's patch from bug
// 60290.
aToken.mIdent.SetCapacity(2);
aToken.mIdent.Assign(PRUnichar(ch));
aToken.mIdent.Append(PRUnichar(nextChar));
return ParseCComment(aToken);
#endif
if (!SkipCComment()) {
return PR_FALSE;
}
continue; // start again at the beginning
}
}
if (ch == '<') { // consume HTML comment tags
if (LookAhead('!')) {
if (LookAhead('-')) {
if (LookAhead('-')) {
aToken.mType = eCSSToken_HTMLComment;
aToken.mIdent.AssignLiteral("<!--");
return PR_TRUE;
}
Pushback('-');
}
Pushback('!');
}
}
if (ch == '-') { // check for HTML comment end
if (LookAhead('-')) {
if (LookAhead('>')) {
aToken.mType = eCSSToken_HTMLComment;
aToken.mIdent.AssignLiteral("-->");
return PR_TRUE;
}
Pushback('-');
}
}
// INCLUDES ("~=") and DASHMATCH ("|=")
if (( ch == '|' ) || ( ch == '~' ) || ( ch == '^' ) ||
( ch == '$' ) || ( ch == '*' )) {
PRInt32 nextChar = Read();
if ( nextChar == '=' ) {
if (ch == '~') {
aToken.mType = eCSSToken_Includes;
}
else if (ch == '|') {
aToken.mType = eCSSToken_Dashmatch;
}
else if (ch == '^') {
aToken.mType = eCSSToken_Beginsmatch;
}
else if (ch == '$') {
aToken.mType = eCSSToken_Endsmatch;
}
else if (ch == '*') {
aToken.mType = eCSSToken_Containsmatch;
}
return PR_TRUE;
} else if (nextChar >= 0) {
Pushback(nextChar);
}
}
aToken.mType = eCSSToken_Symbol;
aToken.mSymbol = ch;
return PR_TRUE;
}
}
PRBool
nsCSSScanner::NextURL(nsCSSToken& aToken)
{
PRInt32 ch = Read();
if (ch < 0) {
return PR_FALSE;
}
// STRING
if ((ch == '"') || (ch == '\'')) {
return ParseString(ch, aToken);
}
// WS
if (IsWhitespace(ch)) {
aToken.mType = eCSSToken_WhiteSpace;
aToken.mIdent.Assign(PRUnichar(ch));
EatWhiteSpace();
return PR_TRUE;
}
// Process a url lexical token. A CSS1 url token can contain
// characters beyond identifier characters (e.g. '/', ':', etc.)
// Because of this the normal rules for tokenizing the input don't
// apply very well. To simplify the parser and relax some of the
// requirements on the scanner we parse url's here. If we find a
// malformed URL then we emit a token of type "InvalidURL" so that
// the CSS1 parser can ignore the invalid input. The parser must
// treat an InvalidURL token like a Function token, and process
// tokens until a matching parenthesis.
aToken.mType = eCSSToken_InvalidURL;
nsString& ident = aToken.mIdent;
ident.SetLength(0);
Pushback(ch);
// start of a non-quoted url (which may be empty)
PRBool ok = PR_TRUE;
for (;;) {
ch = Read();
if (ch < 0) break;
if (ch == CSS_ESCAPE) {
ParseAndAppendEscape(ident);
} else if ((ch == '"') || (ch == '\'') || (ch == '(')) {
// This is an invalid URL spec
ok = PR_FALSE;
Pushback(ch); // push it back so the parser can match tokens and
// then closing parenthesis
break;
} else if (IsWhitespace(ch)) {
// Whitespace is allowed at the end of the URL
EatWhiteSpace();
if (LookAhead(')')) {
Pushback(')'); // leave the closing symbol
// done!
break;
}
// Whitespace is followed by something other than a
// ")". This is an invalid url spec.
ok = PR_FALSE;
break;
} else if (ch == ')') {
Pushback(ch);
// All done
break;
} else {
// A regular url character.
ident.Append(PRUnichar(ch));
}
}
// If the result of the above scanning is ok then change the token
// type to a useful one.
if (ok) {
aToken.mType = eCSSToken_URL;
}
return PR_TRUE;
}
void
nsCSSScanner::ParseAndAppendEscape(nsString& aOutput)
{
PRInt32 ch = Peek();
if (ch < 0) {
aOutput.Append(CSS_ESCAPE);
return;
}
if (IsHexDigit(ch)) {
PRInt32 rv = 0;
int i;
for (i = 0; i < 6; i++) { // up to six digits
ch = Read();
if (ch < 0) {
// Whoops: error or premature eof
break;
}
if (!IsHexDigit(ch) && !IsWhitespace(ch)) {
Pushback(ch);
break;
} else if (IsHexDigit(ch)) {
rv = rv * 16 + HexDigitValue(ch);
} else {
NS_ASSERTION(IsWhitespace(ch), "bad control flow");
// single space ends escape
break;
}
}
if (6 == i) { // look for trailing whitespace and eat it
ch = Peek();
if (IsWhitespace(ch)) {
(void) Read();
}
}
NS_ASSERTION(rv >= 0, "How did rv become negative?");
// "[at most six hexadecimal digits following a backslash] stand
// for the ISO 10646 character with that number, which must not be
// zero. (It is undefined in CSS 2.1 what happens if a style sheet
// does contain a character with Unicode codepoint zero.)"
// -- CSS2.1 section 4.1.3
//
// Silently deleting \0 opens a content-filtration loophole (see
// bug 228856), so what we do instead is pretend the "cancels the
// meaning of special characters" rule applied.
if (rv > 0) {
AppendUCS4ToUTF16(ENSURE_VALID_CHAR(rv), aOutput);
} else {
while (i--)
aOutput.Append('0');
if (IsWhitespace(ch))
Pushback(ch);
}
return;
}
// "Any character except a hexidecimal digit can be escaped to
// remove its special meaning by putting a backslash in front"
// -- CSS1 spec section 7.1
ch = Read(); // Consume the escaped character
if ((ch > 0) && (ch != '\n')) {
aOutput.Append(ch);
}
}
/**
* Gather up the characters in an identifier. The identfier was
* started by "aChar" which will be appended to aIdent. The result
* will be aIdent with all of the identifier characters appended
* until the first non-identifier character is seen. The termination
* character is unread for the future re-reading.
*/
PRBool
nsCSSScanner::GatherIdent(PRInt32 aChar, nsString& aIdent)
{
if (aChar == CSS_ESCAPE) {
ParseAndAppendEscape(aIdent);
}
else if (0 < aChar) {
aIdent.Append(aChar);
}
for (;;) {
// If nothing in pushback, first try to get as much as possible in one go
if (!mPushbackCount && EnsureData()) {
// See how much we can consume and append in one go
PRUint32 n = mOffset;
// Count number of Ident characters that can be processed
while (n < mCount && IsIdent(mReadPointer[n])) {
++n;
}
// Add to the token what we have so far
if (n > mOffset) {
#ifdef CSS_REPORT_PARSE_ERRORS
mColNumber += n - mOffset;
#endif
aIdent.Append(&mReadPointer[mOffset], n - mOffset);
mOffset = n;
}
}
aChar = Read();
if (aChar < 0) break;
if (aChar == CSS_ESCAPE) {
ParseAndAppendEscape(aIdent);
} else if (IsIdent(aChar)) {
aIdent.Append(PRUnichar(aChar));
} else {
Pushback(aChar);
break;
}
}
return PR_TRUE;
}
PRBool
nsCSSScanner::ParseRef(PRInt32 aChar, nsCSSToken& aToken)
{
aToken.mIdent.SetLength(0);
aToken.mType = eCSSToken_Ref;
PRInt32 ch = Read();
if (ch < 0) {
return PR_FALSE;
}
if (IsIdent(ch) || ch == CSS_ESCAPE) {
// First char after the '#' is a valid ident char (or an escape),
// so it makes sense to keep going
if (StartsIdent(ch, Peek())) {
aToken.mType = eCSSToken_ID;
}
return GatherIdent(ch, aToken.mIdent);
}
// No ident chars after the '#'. Just unread |ch| and get out of here.
Pushback(ch);
return PR_TRUE;
}
PRBool
nsCSSScanner::ParseIdent(PRInt32 aChar, nsCSSToken& aToken)
{
nsString& ident = aToken.mIdent;
ident.SetLength(0);
if (!GatherIdent(aChar, ident)) {
return PR_FALSE;
}
nsCSSTokenType tokenType = eCSSToken_Ident;
// look for functions (ie: "ident(")
if (Peek() == PRUnichar('(')) {
Read();
tokenType = eCSSToken_Function;
}
aToken.mType = tokenType;
return PR_TRUE;
}
PRBool
nsCSSScanner::ParseAtKeyword(PRInt32 aChar, nsCSSToken& aToken)
{
aToken.mIdent.SetLength(0);
aToken.mType = eCSSToken_AtKeyword;
return GatherIdent(0, aToken.mIdent);
}
PRBool
nsCSSScanner::ParseNumber(PRInt32 c, nsCSSToken& aToken)
{
NS_PRECONDITION(c == '.' || c == '+' || c == '-' || IsDigit(c),
"Why did we get called?");
aToken.mHasSign = (c == '+' || c == '-');
// Our sign.
PRInt32 sign = c == '-' ? -1 : 1;
// Absolute value of the integer part of the mantissa. This is a double so
// we don't run into overflow issues for consumers that only care about our
// floating-point value while still being able to express the full PRInt32
// range for consumers who want integers.
double intPart = 0;
// Fractional part of the mantissa. This is a double so that when we convert
// to float at the end we'll end up rounding to nearest float instead of
// truncating down (as we would if fracPart were a float and we just
// effectively lost the last several digits).
double fracPart = 0;
// Absolute value of the power of 10 that we should multiply by (only
// relevant for numbers in scientific notation). Has to be a signed integer,
// because multiplication of signed by unsigned converts the unsigned to
// signed, so if we plan to actually multiply by expSign...
PRInt32 exponent = 0;
// Sign of the exponent.
PRInt32 expSign = 1;
if (aToken.mHasSign) {
NS_ASSERTION(c != '.', "How did that happen?");
c = Read();
}
PRBool gotDot = (c == '.');
if (!gotDot) {
// Parse the integer part of the mantisssa
NS_ASSERTION(IsDigit(c), "Why did we get called?");
do {
intPart = 10*intPart + DecimalDigitValue(c);
c = Read();
// The IsDigit check will do the right thing even if Read() returns < 0
} while (IsDigit(c));
gotDot = (c == '.') && IsDigit(Peek());
}
if (gotDot) {
// Parse the fractional part of the mantissa.
c = Read();
NS_ASSERTION(IsDigit(c), "How did we get here?");
// Power of ten by which we need to divide our next digit
float divisor = 10;
do {
fracPart += DecimalDigitValue(c) / divisor;
divisor *= 10;
c = Read();
// The IsDigit check will do the right thing even if Read() returns < 0
} while (IsDigit(c));
}
PRBool gotE = PR_FALSE;
#ifdef MOZ_SVG
if (IsSVGMode() && (c == 'e' || c == 'E')) {
PRInt32 nextChar = Peek();
PRInt32 expSignChar = 0;
if (nextChar == '-' || nextChar == '+') {
expSignChar = Read();
nextChar = Peek();
}
if (IsDigit(nextChar)) {
gotE = PR_TRUE;
if (expSignChar == '-') {
expSign = -1;
}
c = Read();
NS_ASSERTION(IsDigit(c), "Peek() must have lied");
do {
exponent = 10*exponent + DecimalDigitValue(c);
c = Read();
// The IsDigit check will do the right thing even if Read() returns < 0
} while (IsDigit(c));
} else {
if (expSignChar) {
Pushback(expSignChar);
}
}
}
#endif
nsCSSTokenType type = eCSSToken_Number;
// Set mIntegerValid for all cases (except %, below) because we need
// it for the "2n" in :nth-child(2n).
aToken.mIntegerValid = PR_FALSE;
// Time to reassemble our number.
float value = float(sign * (intPart + fracPart));
if (gotE) {
// pow(), not powf(), because at least wince doesn't have the latter.
// And explicitly cast everything to doubles to avoid issues with
// overloaded pow() on Windows.
value *= pow(10.0, double(expSign * exponent));
} else if (!gotDot) {
if (intPart > PR_INT32_MAX) {
// Just clamp it.
intPart = PR_INT32_MAX;
}
aToken.mInteger = PRInt32(sign * intPart);
aToken.mIntegerValid = PR_TRUE;
}
nsString& ident = aToken.mIdent;
ident.Truncate();
// Look at character that terminated the number
if (c >= 0) {
if (StartsIdent(c, Peek())) {
if (!GatherIdent(c, ident)) {
return PR_FALSE;
}
type = eCSSToken_Dimension;
} else if ('%' == c) {
type = eCSSToken_Percentage;
value = value / 100.0f;
aToken.mIntegerValid = PR_FALSE;
} else {
// Put back character that stopped numeric scan
Pushback(c);
}
}
aToken.mNumber = value;
aToken.mType = type;
return PR_TRUE;
}
PRBool
nsCSSScanner::SkipCComment()
{
for (;;) {
PRInt32 ch = Read();
if (ch < 0) break;
if (ch == '*') {
if (LookAhead('/')) {
return PR_TRUE;
}
}
}
REPORT_UNEXPECTED_EOF(PECommentEOF);
return PR_FALSE;
}
PRBool
nsCSSScanner::ParseString(PRInt32 aStop, nsCSSToken& aToken)
{
aToken.mIdent.SetLength(0);
aToken.mType = eCSSToken_String;
aToken.mSymbol = PRUnichar(aStop); // remember how it's quoted
for (;;) {
// If nothing in pushback, first try to get as much as possible in one go
if (!mPushbackCount && EnsureData()) {
// See how much we can consume and append in one go
PRUint32 n = mOffset;
// Count number of characters that can be processed
for (;n < mCount; ++n) {
PRUnichar nextChar = mReadPointer[n];
if ((nextChar == aStop) || (nextChar == CSS_ESCAPE) ||
(nextChar == '\n') || (nextChar == '\r') || (nextChar == '\f')) {
break;
}
#ifdef CSS_REPORT_PARSE_ERRORS
if (nextChar == '\t') {
mColNumber = ((mColNumber - 1 + TAB_STOP_WIDTH) / TAB_STOP_WIDTH)
* TAB_STOP_WIDTH;
} else {
++mColNumber;
}
#endif
}
// Add to the token what we have so far
if (n > mOffset) {
aToken.mIdent.Append(&mReadPointer[mOffset], n - mOffset);
mOffset = n;
}
}
PRInt32 ch = Read();
if (ch < 0 || ch == aStop) {
break;
}
if (ch == '\n') {
aToken.mType = eCSSToken_Error;
#ifdef CSS_REPORT_PARSE_ERRORS
ReportUnexpectedToken(aToken, "SEUnterminatedString");
#endif
break;
}
if (ch == CSS_ESCAPE) {
ParseAndAppendEscape(aToken.mIdent);
} else {
aToken.mIdent.Append(ch);
}
}
return PR_TRUE;
}
// UNICODE-RANGE tokens match the regular expression
//
// u\+[0-9a-f?]{1,6}(-[0-9a-f]{1,6})?
//
// However, some such tokens are "invalid". There are three valid forms:
//
// u+[0-9a-f]{x} 1 <= x <= 6
// u+[0-9a-f]{x}\?{y} 1 <= x+y <= 6
// u+[0-9a-f]{x}-[0-9a-f]{y} 1 <= x <= 6, 1 <= y <= 6
//
// All unicode-range tokens have their text recorded in mIdent; valid ones
// are also decoded into mInteger and mInteger2, and mIntegerValid is set.
PRBool
nsCSSScanner::ParseURange(PRInt32 aChar, nsCSSToken& aResult)
{
PRInt32 intro2 = Read();
PRInt32 ch = Peek();
// We should only ever be called if these things are true.
NS_ASSERTION(aChar == 'u' || aChar == 'U',
"unicode-range called with improper introducer (U)");
NS_ASSERTION(intro2 == '+',
"unicode-range called with improper introducer (+)");
// If the character immediately after the '+' is not a hex digit or
// '?', this is not really a unicode-range token; push everything
// back and scan the U as an ident.
if (!IsHexDigit(ch) && ch != '?') {
Pushback(intro2);
Pushback(aChar);
return ParseIdent(aChar, aResult);
}
aResult.mIdent.Truncate();
aResult.mIdent.Append(aChar);
aResult.mIdent.Append(intro2);
PRBool valid = PR_TRUE;
PRBool haveQues = PR_FALSE;
PRUint32 low = 0;
PRUint32 high = 0;
int i = 0;
for (;;) {
ch = Read();
i++;
if (i == 7 || !(IsHexDigit(ch) || ch == '?')) {
break;
}
aResult.mIdent.Append(ch);
if (IsHexDigit(ch)) {
if (haveQues) {
valid = PR_FALSE; // all question marks should be at the end
}
low = low*16 + HexDigitValue(ch);
high = high*16 + HexDigitValue(ch);
} else {
haveQues = PR_TRUE;
low = low*16 + 0x0;
high = high*16 + 0xF;
}
}
if (ch == '-' && IsHexDigit(Peek())) {
if (haveQues) {
valid = PR_FALSE;
}
aResult.mIdent.Append(ch);
high = 0;
i = 0;
for (;;) {
ch = Read();
i++;
if (i == 7 || !IsHexDigit(ch)) {
break;
}
aResult.mIdent.Append(ch);
high = high*16 + HexDigitValue(ch);
}
}
Pushback(ch);
aResult.mInteger = low;
aResult.mInteger2 = high;
aResult.mIntegerValid = valid;
aResult.mType = eCSSToken_URange;
return PR_TRUE;
}