зеркало из https://github.com/mozilla/pjs.git
892 строки
23 KiB
C++
892 строки
23 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* The contents of this file are subject to the Netscape Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/NPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All
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* Rights Reserved.
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*
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* Contributor(s):
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*/
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#include "nsCSSScanner.h"
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#include "nsIInputStream.h"
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#include "nsIUnicharInputStream.h"
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#include "nsString.h"
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#include "nsCRT.h"
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#ifdef NS_DEBUG
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static char* kNullPointer = "null pointer";
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#endif
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#ifdef CSS_REPORT_PARSE_ERRORS
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#include "nsCOMPtr.h"
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#include "nsIServiceManager.h"
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#include "nsReadableUtils.h"
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#include "nsIURI.h"
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#include "nsIConsoleService.h"
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#include "nsIScriptError.h"
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#include "nsComponentManagerUtils.h" // put this higher and gcc barfs...
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#endif
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// Don't bother collecting whitespace characters in token's mIdent buffer
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#undef COLLECT_WHITESPACE
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#define BUFFER_SIZE 256
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static const PRUnichar CSS_ESCAPE = PRUnichar('\\');
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static const PRUint8 IS_LATIN1 = 0x01;
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static const PRUint8 IS_DIGIT = 0x02;
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static const PRUint8 IS_HEX_DIGIT = 0x04;
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static const PRUint8 IS_ALPHA = 0x08;
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static const PRUint8 START_IDENT = 0x10;
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static const PRUint8 IS_IDENT = 0x20;
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static const PRUint8 IS_WHITESPACE = 0x40;
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static PRBool gLexTableSetup = PR_FALSE;
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static PRUint8 gLexTable[256];
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static void BuildLexTable()
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{
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gLexTableSetup = PR_TRUE;
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PRUint8* lt = gLexTable;
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int i;
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lt[CSS_ESCAPE] = START_IDENT;
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lt['-'] |= IS_IDENT;
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// XXX add in other whitespace chars
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lt[' '] |= IS_WHITESPACE; // space
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lt['\t'] |= IS_WHITESPACE; // horizontal tab
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lt['\v'] |= IS_WHITESPACE; // vertical tab
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lt['\r'] |= IS_WHITESPACE; // carriage return
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lt['\n'] |= IS_WHITESPACE; // line feed
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lt['\f'] |= IS_WHITESPACE; // form feed
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for (i = 161; i <= 255; i++) {
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lt[i] |= IS_LATIN1 | IS_IDENT | START_IDENT;
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}
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for (i = '0'; i <= '9'; i++) {
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lt[i] |= IS_DIGIT | IS_HEX_DIGIT | IS_IDENT;
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}
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for (i = 'A'; i <= 'Z'; i++) {
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if ((i >= 'A') && (i <= 'F')) {
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lt[i] |= IS_HEX_DIGIT;
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lt[i+32] |= IS_HEX_DIGIT;
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}
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lt[i] |= IS_ALPHA | IS_IDENT | START_IDENT;
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lt[i+32] |= IS_ALPHA | IS_IDENT | START_IDENT;
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}
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}
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nsCSSToken::nsCSSToken()
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{
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mType = eCSSToken_Symbol;
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}
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void
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nsCSSToken::AppendToString(nsString& aBuffer)
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{
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switch (mType) {
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case eCSSToken_AtKeyword:
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aBuffer.Append(PRUnichar('@')); // fall through intentional
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case eCSSToken_Ident:
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case eCSSToken_WhiteSpace:
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case eCSSToken_Function:
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case eCSSToken_URL:
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case eCSSToken_InvalidURL:
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case eCSSToken_HTMLComment:
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aBuffer.Append(mIdent);
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break;
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case eCSSToken_Number:
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if (mIntegerValid) {
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aBuffer.AppendInt(mInteger, 10);
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}
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else {
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aBuffer.AppendFloat(mNumber);
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}
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break;
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case eCSSToken_Percentage:
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if (mIntegerValid) {
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aBuffer.AppendInt(mInteger, 10);
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}
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else {
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aBuffer.AppendFloat(mNumber);
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}
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aBuffer.Append(PRUnichar('%')); // STRING USE WARNING: technically, this should be |AppendWithConversion|
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break;
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case eCSSToken_Dimension:
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if (mIntegerValid) {
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aBuffer.AppendInt(mInteger, 10);
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}
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else {
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aBuffer.AppendFloat(mNumber);
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}
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aBuffer.Append(mIdent);
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break;
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case eCSSToken_String:
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aBuffer.Append(mSymbol);
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aBuffer.Append(mIdent); // fall through intentional
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case eCSSToken_Symbol:
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aBuffer.Append(mSymbol);
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break;
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case eCSSToken_ID:
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aBuffer.Append(PRUnichar('#'));
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aBuffer.Append(mIdent);
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break;
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case eCSSToken_Includes:
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aBuffer.Append(PRUnichar('~'));
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aBuffer.Append(PRUnichar('='));
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break;
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case eCSSToken_Dashmatch:
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aBuffer.Append(PRUnichar('|'));
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aBuffer.Append(PRUnichar('='));
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break;
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default:
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NS_ERROR("invalid token type");
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break;
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}
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}
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MOZ_DECL_CTOR_COUNTER(nsCSSScanner);
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nsCSSScanner::nsCSSScanner()
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{
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MOZ_COUNT_CTOR(nsCSSScanner);
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if (!gLexTableSetup) {
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// XXX need a monitor
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BuildLexTable();
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}
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mInput = nsnull;
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mBuffer = new PRUnichar[BUFFER_SIZE];
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mOffset = 0;
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mCount = 0;
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mPushback = mLocalPushback;
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mPushbackCount = 0;
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mPushbackSize = 4;
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#ifdef CSS_REPORT_PARSE_ERRORS
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mLastRead = 0;
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#endif
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}
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nsCSSScanner::~nsCSSScanner()
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{
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MOZ_COUNT_DTOR(nsCSSScanner);
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Close();
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if (nsnull != mBuffer) {
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delete [] mBuffer;
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mBuffer = nsnull;
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}
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if (mLocalPushback != mPushback) {
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delete [] mPushback;
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}
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}
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void nsCSSScanner::Init(nsIUnicharInputStream* aInput)
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{
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NS_PRECONDITION(nsnull != aInput, kNullPointer);
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Close();
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mInput = aInput;
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NS_IF_ADDREF(aInput);
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}
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#ifdef CSS_REPORT_PARSE_ERRORS
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void nsCSSScanner::InitErrorReporting(nsIURI* aURI)
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{
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if (aURI) {
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aURI->GetSpec(getter_Copies(mFileName));
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} else {
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mFileName = "from DOM";
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}
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mLineNumber = 1;
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mColNumber = 0;
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}
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void nsCSSScanner::ReportError(const nsAReadableString& aError)
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{
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printf("CSS Error (%s :%u.%u): %s.\n",
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mFileName.get(),
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mLineNumber,
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mColNumber,
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NS_ConvertUCS2toUTF8(aError).GetBuffer());
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// Log it to the JavaScript console
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nsCOMPtr<nsIConsoleService> consoleService
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(do_GetService("@mozilla.org/consoleservice;1"));
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nsCOMPtr<nsIScriptError> errorObject
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(do_CreateInstance("@mozilla.org/scripterror;1"));
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if (consoleService && errorObject) {
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nsresult rv;
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PRUnichar *error = ToNewUnicode(aError);
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rv = errorObject->Init(error,
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NS_ConvertASCIItoUCS2(mFileName.get()).GetUnicode(),
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NS_LITERAL_STRING(""),
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mLineNumber,
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mColNumber,
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0,
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"CSS Parser");
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nsMemory::Free(error);
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if (NS_SUCCEEDED(rv))
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consoleService->LogMessage(errorObject);
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}
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}
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#endif // CSS_REPORT_PARSE_ERRORS
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void nsCSSScanner::Close()
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{
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NS_IF_RELEASE(mInput);
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}
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#ifdef CSS_REPORT_PARSE_ERRORS
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#define TAB_STOP_WIDTH 8
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#endif
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// Returns -1 on error or eof
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PRInt32 nsCSSScanner::Read(PRInt32& aErrorCode)
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{
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PRInt32 rv;
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if (0 < mPushbackCount) {
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rv = PRInt32(mPushback[--mPushbackCount]);
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} else {
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if (mCount < 0) {
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return -1;
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}
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if (mOffset == mCount) {
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mOffset = 0;
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aErrorCode = mInput->Read(mBuffer, 0, BUFFER_SIZE, (PRUint32*)&mCount);
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if (NS_FAILED(aErrorCode) || mCount == 0) {
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mCount = 0;
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return -1;
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}
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}
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rv = PRInt32(mBuffer[mOffset++]);
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#ifdef CSS_REPORT_PARSE_ERRORS
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if (((rv == '\n') && (mLastRead != '\r')) || (rv == '\r')) {
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mLineNumber++;
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mColNumber = 0;
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} else if (rv == '\t') {
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mColNumber = ((mColNumber - 1 + TAB_STOP_WIDTH) / TAB_STOP_WIDTH)
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* TAB_STOP_WIDTH;
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} else if (rv != '\n') {
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mColNumber++;
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}
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#endif
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}
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mLastRead = rv;
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//printf("Read => %x\n", rv);
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return rv;
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}
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PRInt32 nsCSSScanner::Peek(PRInt32& aErrorCode)
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{
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if (0 == mPushbackCount) {
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PRInt32 ch = Read(aErrorCode);
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if (ch < 0) {
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return -1;
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}
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mPushback[0] = PRUnichar(ch);
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mPushbackCount++;
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}
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//printf("Peek => %x\n", mLookAhead);
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return PRInt32(mPushback[mPushbackCount - 1]);
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}
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void nsCSSScanner::Unread()
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{
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NS_PRECONDITION((mLastRead >= 0), "double pushback");
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Pushback(PRUnichar(mLastRead));
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mLastRead = -1;
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}
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void nsCSSScanner::Pushback(PRUnichar aChar)
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{
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if (mPushbackCount == mPushbackSize) { // grow buffer
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PRUnichar* newPushback = new PRUnichar[mPushbackSize + 4];
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if (nsnull == newPushback) {
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return;
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}
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mPushbackSize += 4;
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nsCRT::memcpy(newPushback, mPushback, sizeof(PRUnichar) * mPushbackCount);
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if (mPushback != mLocalPushback) {
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delete [] mPushback;
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}
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mPushback = newPushback;
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}
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mPushback[mPushbackCount++] = aChar;
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}
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PRBool nsCSSScanner::LookAhead(PRInt32& aErrorCode, PRUnichar aChar)
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{
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PRInt32 ch = Read(aErrorCode);
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if (ch < 0) {
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return PR_FALSE;
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}
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if (ch == aChar) {
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return PR_TRUE;
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}
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Unread();
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return PR_FALSE;
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}
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PRBool nsCSSScanner::EatWhiteSpace(PRInt32& aErrorCode)
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{
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PRBool eaten = PR_FALSE;
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for (;;) {
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PRInt32 ch = Read(aErrorCode);
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if (ch < 0) {
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break;
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}
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if ((ch == ' ') || (ch == '\n') || (ch == '\r') || (ch == '\t')) {
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eaten = PR_TRUE;
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continue;
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}
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Unread();
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break;
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}
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return eaten;
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}
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PRBool nsCSSScanner::EatNewline(PRInt32& aErrorCode)
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{
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PRInt32 ch = Read(aErrorCode);
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if (ch < 0) {
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return PR_FALSE;
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}
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PRBool eaten = PR_FALSE;
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if (ch == '\r') {
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eaten = PR_TRUE;
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ch = Peek(aErrorCode);
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if (ch == '\n') {
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(void) Read(aErrorCode);
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}
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} else if (ch == '\n') {
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eaten = PR_TRUE;
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} else {
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Unread();
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}
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return eaten;
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}
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PRBool nsCSSScanner::Next(PRInt32& aErrorCode, nsCSSToken& aToken)
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{
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PRInt32 ch = Read(aErrorCode);
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if (ch < 0) {
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return PR_FALSE;
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}
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if (ch < 256) {
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PRUint8* lexTable = gLexTable;
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// IDENT
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if ((lexTable[ch] & START_IDENT) != 0) {
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return ParseIdent(aErrorCode, ch, aToken);
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}
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if (ch == '-') { // possible ident
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PRInt32 nextChar = Peek(aErrorCode);
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if ((0 <= nextChar) && (0 != (lexTable[nextChar] & START_IDENT))) {
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return ParseIdent(aErrorCode, ch, aToken);
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}
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}
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// AT_KEYWORD
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if (ch == '@') {
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PRInt32 nextChar = Peek(aErrorCode);
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if ((nextChar >= 0) && (nextChar <= 255)) {
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if ((lexTable[nextChar] & START_IDENT) != 0) {
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return ParseAtKeyword(aErrorCode, ch, aToken);
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}
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}
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}
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// NUMBER or DIM
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if ((ch == '.') || (ch == '+') || (ch == '-')) {
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PRInt32 nextChar = Peek(aErrorCode);
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if ((nextChar >= 0) && (nextChar <= 255)) {
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if ((lexTable[nextChar] & IS_DIGIT) != 0) {
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return ParseNumber(aErrorCode, ch, aToken);
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}
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else if (('.' == nextChar) && ('.' != ch)) {
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PRInt32 holdNext = Read(aErrorCode);
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nextChar = Peek(aErrorCode);
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if ((0 <= nextChar) && (nextChar <= 255)) {
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if ((lexTable[nextChar] & IS_DIGIT) != 0) {
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Pushback(holdNext);
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return ParseNumber(aErrorCode, ch, aToken);
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}
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}
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Pushback(holdNext);
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}
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}
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}
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if ((lexTable[ch] & IS_DIGIT) != 0) {
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return ParseNumber(aErrorCode, ch, aToken);
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}
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// ID
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if (ch == '#') {
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return ParseID(aErrorCode, ch, aToken);
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}
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// STRING
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if ((ch == '"') || (ch == '\'')) {
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return ParseString(aErrorCode, ch, aToken);
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}
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// WS
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if ((lexTable[ch] & IS_WHITESPACE) != 0) {
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aToken.mType = eCSSToken_WhiteSpace;
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aToken.mIdent.SetLength(0);
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aToken.mIdent.Append(PRUnichar(ch));
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(void) EatWhiteSpace(aErrorCode);
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return PR_TRUE;
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}
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if (ch == '/') {
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PRInt32 nextChar = Peek(aErrorCode);
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if (nextChar == '*') {
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(void) Read(aErrorCode);
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aToken.mIdent.SetLength(0);
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aToken.mIdent.Append(PRUnichar(ch));
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aToken.mIdent.Append(PRUnichar(nextChar));
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return ParseCComment(aErrorCode, aToken);
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}
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}
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if (ch == '<') { // consume HTML comment tags
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if (LookAhead(aErrorCode, '!')) {
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if (LookAhead(aErrorCode, '-')) {
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if (LookAhead(aErrorCode, '-')) {
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aToken.mType = eCSSToken_HTMLComment;
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aToken.mIdent.SetLength(0);
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aToken.mIdent.Append(PRUnichar('<'));
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aToken.mIdent.Append(PRUnichar('!'));
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aToken.mIdent.Append(PRUnichar('-'));
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aToken.mIdent.Append(PRUnichar('-'));
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return PR_TRUE;
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}
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Pushback('-');
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}
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Pushback('!');
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}
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}
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if (ch == '-') { // check for HTML comment end
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if (LookAhead(aErrorCode, '-')) {
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if (LookAhead(aErrorCode, '>')) {
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aToken.mType = eCSSToken_HTMLComment;
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aToken.mIdent.SetLength(0);
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aToken.mIdent.AppendWithConversion('-');
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aToken.mIdent.AppendWithConversion('-');
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aToken.mIdent.AppendWithConversion('>');
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return PR_TRUE;
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}
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Pushback('-');
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}
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}
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// INCLUDES ("~=") and DASHMATCH ("|=")
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if (( ch == '|' ) || ( ch == '~')) {
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PRInt32 nextChar = Read(aErrorCode);
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if ( nextChar == '=' ) {
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aToken.mType = (ch == '~') ? eCSSToken_Includes : eCSSToken_Dashmatch;
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return PR_TRUE;
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} else {
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Pushback(nextChar);
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}
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}
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} else {
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return ParseIdent(aErrorCode, ch, aToken);
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}
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aToken.mType = eCSSToken_Symbol;
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aToken.mSymbol = ch;
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return PR_TRUE;
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}
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PRBool nsCSSScanner::NextURL(PRInt32& aErrorCode, nsCSSToken& aToken)
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{
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PRInt32 ch = Read(aErrorCode);
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if (ch < 0) {
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return PR_FALSE;
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}
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if (ch < 256) {
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PRUint8* lexTable = gLexTable;
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// STRING
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if ((ch == '"') || (ch == '\'')) {
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return ParseString(aErrorCode, ch, aToken);
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}
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|
|
// WS
|
|
if ((lexTable[ch] & IS_WHITESPACE) != 0) {
|
|
aToken.mType = eCSSToken_WhiteSpace;
|
|
aToken.mIdent.SetLength(0);
|
|
aToken.mIdent.Append(PRUnichar(ch));
|
|
(void) EatWhiteSpace(aErrorCode);
|
|
return PR_TRUE;
|
|
}
|
|
if (ch == '/') {
|
|
PRInt32 nextChar = Peek(aErrorCode);
|
|
if (nextChar == '*') {
|
|
(void) Read(aErrorCode);
|
|
aToken.mIdent.SetLength(0);
|
|
aToken.mIdent.Append(PRUnichar(ch));
|
|
aToken.mIdent.Append(PRUnichar(nextChar));
|
|
return ParseCComment(aErrorCode, aToken);
|
|
}
|
|
}
|
|
|
|
// 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. We attempt to eat
|
|
// the right amount of input data when an invalid URL is presented.
|
|
|
|
aToken.mType = eCSSToken_InvalidURL;
|
|
nsString& ident = aToken.mIdent;
|
|
ident.SetLength(0);
|
|
|
|
if (ch == ')') {
|
|
Pushback(ch);
|
|
// empty url spec: this is invalid
|
|
} else {
|
|
// start of a non-quoted url
|
|
Pushback(ch);
|
|
PRBool ok = PR_TRUE;
|
|
for (;;) {
|
|
ch = Read(aErrorCode);
|
|
if (ch < 0) break;
|
|
if (ch == CSS_ESCAPE) {
|
|
ch = ParseEscape(aErrorCode);
|
|
if (0 < ch) {
|
|
ident.Append(PRUnichar(ch));
|
|
}
|
|
} else if ((ch == '"') || (ch == '\'') || (ch == '(')) {
|
|
// This is an invalid URL spec
|
|
ok = PR_FALSE;
|
|
} else if ((256 >= ch) && ((gLexTable[ch] & IS_WHITESPACE) != 0)) {
|
|
// Whitespace is allowed at the end of the URL
|
|
(void) EatWhiteSpace(aErrorCode);
|
|
if (LookAhead(aErrorCode, ')')) {
|
|
Pushback(')'); // leave the closing symbol
|
|
// done!
|
|
break;
|
|
}
|
|
// Whitespace is followed by something other than a
|
|
// ")". This is an invalid url spec.
|
|
ok = PR_FALSE;
|
|
} else if (ch == ')') {
|
|
Unread();
|
|
// 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;
|
|
}
|
|
|
|
|
|
PRInt32 nsCSSScanner::ParseEscape(PRInt32& aErrorCode)
|
|
{
|
|
PRUint8* lexTable = gLexTable;
|
|
PRInt32 ch = Peek(aErrorCode);
|
|
if (ch < 0) {
|
|
return CSS_ESCAPE;
|
|
}
|
|
if ((ch <= 255) && ((lexTable[ch] & IS_HEX_DIGIT) != 0)) {
|
|
PRInt32 rv = 0;
|
|
int i;
|
|
for (i = 0; i < 6; i++) { // up to six digits
|
|
ch = Read(aErrorCode);
|
|
if (ch < 0) {
|
|
// Whoops: error or premature eof
|
|
break;
|
|
}
|
|
if ((lexTable[ch] & IS_HEX_DIGIT) != 0) {
|
|
if ((lexTable[ch] & IS_DIGIT) != 0) {
|
|
rv = rv * 16 + (ch - '0');
|
|
} 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.
|
|
rv = rv * 16 + ((ch & 0x7) + 9);
|
|
}
|
|
}
|
|
else if ((lexTable[ch] & IS_WHITESPACE) != 0) { // single space ends escape
|
|
if (ch == '\r') { // if CR/LF, eat LF too
|
|
ch = Peek(aErrorCode);
|
|
if (ch == '\n') {
|
|
ch = Read(aErrorCode);
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
else {
|
|
Unread();
|
|
break;
|
|
}
|
|
}
|
|
if (6 == i) { // look for trailing whitespace and eat it
|
|
ch = Peek(aErrorCode);
|
|
if ((0 <= ch) && (ch <= 255) &&
|
|
((lexTable[ch] & IS_WHITESPACE) != 0)) {
|
|
ch = Read(aErrorCode);
|
|
// special case: if trailing whitespace is CR/LF, eat both chars (not part of spec, but should be)
|
|
if (ch == '\r') {
|
|
ch = Peek(aErrorCode);
|
|
if (ch == '\n') {
|
|
ch = Read(aErrorCode);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return rv;
|
|
} else {
|
|
// "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
|
|
if (EatNewline(aErrorCode)) { // skip escaped newline
|
|
ch = 0;
|
|
}
|
|
else {
|
|
(void) Read(aErrorCode);
|
|
}
|
|
return 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& aErrorCode, PRInt32 aChar,
|
|
nsString& aIdent)
|
|
{
|
|
if (aChar == CSS_ESCAPE) {
|
|
aChar = ParseEscape(aErrorCode);
|
|
}
|
|
if (0 < aChar) {
|
|
aIdent.Append(PRUnichar(aChar));
|
|
}
|
|
for (;;) {
|
|
aChar = Read(aErrorCode);
|
|
if (aChar < 0) break;
|
|
if (aChar == CSS_ESCAPE) {
|
|
aChar = ParseEscape(aErrorCode);
|
|
if (0 < aChar) {
|
|
aIdent.Append(PRUnichar(aChar));
|
|
}
|
|
} else if ((aChar > 255) || ((gLexTable[aChar] & IS_IDENT) != 0)) {
|
|
aIdent.Append(PRUnichar(aChar));
|
|
} else {
|
|
Unread();
|
|
break;
|
|
}
|
|
}
|
|
return PR_TRUE;
|
|
}
|
|
|
|
PRBool nsCSSScanner::ParseID(PRInt32& aErrorCode,
|
|
PRInt32 aChar,
|
|
nsCSSToken& aToken)
|
|
{
|
|
aToken.mIdent.SetLength(0);
|
|
aToken.mType = eCSSToken_ID;
|
|
return GatherIdent(aErrorCode, 0, aToken.mIdent);
|
|
}
|
|
|
|
PRBool nsCSSScanner::ParseIdent(PRInt32& aErrorCode,
|
|
PRInt32 aChar,
|
|
nsCSSToken& aToken)
|
|
{
|
|
nsString& ident = aToken.mIdent;
|
|
ident.SetLength(0);
|
|
if (!GatherIdent(aErrorCode, aChar, ident)) {
|
|
return PR_FALSE;
|
|
}
|
|
|
|
nsCSSTokenType tokenType = eCSSToken_Ident;
|
|
// look for functions (ie: "ident(")
|
|
if (PRUnichar('(') == PRUnichar(Peek(aErrorCode))) { // this is a function definition
|
|
tokenType = eCSSToken_Function;
|
|
}
|
|
|
|
aToken.mType = tokenType;
|
|
return PR_TRUE;
|
|
}
|
|
|
|
PRBool nsCSSScanner::ParseAtKeyword(PRInt32& aErrorCode, PRInt32 aChar,
|
|
nsCSSToken& aToken)
|
|
{
|
|
aToken.mIdent.SetLength(0);
|
|
aToken.mType = eCSSToken_AtKeyword;
|
|
return GatherIdent(aErrorCode, 0, aToken.mIdent);
|
|
}
|
|
|
|
PRBool nsCSSScanner::ParseNumber(PRInt32& aErrorCode, PRInt32 c,
|
|
nsCSSToken& aToken)
|
|
{
|
|
nsString& ident = aToken.mIdent;
|
|
ident.SetLength(0);
|
|
PRBool gotDot = (c == '.') ? PR_TRUE : PR_FALSE;
|
|
if (c != '+') {
|
|
ident.Append(PRUnichar(c));
|
|
}
|
|
|
|
// Gather up characters that make up the number
|
|
PRUint8* lexTable = gLexTable;
|
|
for (;;) {
|
|
c = Read(aErrorCode);
|
|
if (c < 0) break;
|
|
if (!gotDot && (c == '.')) {
|
|
gotDot = PR_TRUE;
|
|
} else if ((c > 255) || ((lexTable[c] & IS_DIGIT) == 0)) {
|
|
break;
|
|
}
|
|
ident.Append(PRUnichar(c));
|
|
}
|
|
|
|
// Convert number to floating point
|
|
nsCSSTokenType type = eCSSToken_Number;
|
|
PRInt32 ec;
|
|
float value = ident.ToFloat(&ec);
|
|
|
|
// Look at character that terminated the number
|
|
aToken.mIntegerValid = PR_FALSE;
|
|
if (c >= 0) {
|
|
if ((c <= 255) && ((lexTable[c] & START_IDENT) != 0)) {
|
|
ident.SetLength(0);
|
|
if (!GatherIdent(aErrorCode, c, ident)) {
|
|
return PR_FALSE;
|
|
}
|
|
type = eCSSToken_Dimension;
|
|
} else if ('%' == c) {
|
|
type = eCSSToken_Percentage;
|
|
value = value / 100.0f;
|
|
ident.SetLength(0);
|
|
} else {
|
|
// Put back character that stopped numeric scan
|
|
Unread();
|
|
if (!gotDot) {
|
|
aToken.mInteger = ident.ToInteger(&ec);
|
|
aToken.mIntegerValid = PR_TRUE;
|
|
}
|
|
ident.SetLength(0);
|
|
}
|
|
}
|
|
else { // stream ended
|
|
if (!gotDot) {
|
|
aToken.mInteger = ident.ToInteger(&ec);
|
|
aToken.mIntegerValid = PR_TRUE;
|
|
}
|
|
ident.SetLength(0);
|
|
}
|
|
aToken.mNumber = value;
|
|
aToken.mType = type;
|
|
return PR_TRUE;
|
|
}
|
|
|
|
PRBool nsCSSScanner::ParseCComment(PRInt32& aErrorCode, nsCSSToken& aToken)
|
|
{
|
|
nsString& ident = aToken.mIdent;
|
|
for (;;) {
|
|
PRInt32 ch = Read(aErrorCode);
|
|
if (ch < 0) break;
|
|
if (ch == '*') {
|
|
if (LookAhead(aErrorCode, '/')) {
|
|
ident.Append(PRUnichar(ch)); // STRING USE WARNING: technically, this should be |AppendWithConversion|
|
|
ident.AppendWithConversion('/');
|
|
break;
|
|
}
|
|
}
|
|
#ifdef COLLECT_WHITESPACE
|
|
ident.Append(PRUnichar(ch));
|
|
#endif
|
|
}
|
|
aToken.mType = eCSSToken_WhiteSpace;
|
|
return PR_TRUE;
|
|
}
|
|
|
|
#if 0
|
|
PRBool nsCSSScanner::ParseEOLComment(PRInt32& aErrorCode, nsCSSToken& aToken)
|
|
{
|
|
nsString& ident = aToken.mIdent;
|
|
ident.SetLength(0);
|
|
for (;;) {
|
|
if (EatNewline(aErrorCode)) {
|
|
break;
|
|
}
|
|
PRInt32 ch = Read(aErrorCode);
|
|
if (ch < 0) {
|
|
break;
|
|
}
|
|
#ifdef COLLECT_WHITESPACE
|
|
ident.Append(PRUnichar(ch));
|
|
#endif
|
|
}
|
|
aToken.mType = eCSSToken_WhiteSpace;
|
|
return PR_TRUE;
|
|
}
|
|
#endif // 0
|
|
|
|
PRBool nsCSSScanner::GatherString(PRInt32& aErrorCode, PRInt32 aStop,
|
|
nsString& aBuffer)
|
|
{
|
|
for (;;) {
|
|
if (EatNewline(aErrorCode)) {
|
|
break;
|
|
}
|
|
PRInt32 ch = Read(aErrorCode);
|
|
if (ch < 0) {
|
|
return PR_FALSE;
|
|
}
|
|
if (ch == aStop) {
|
|
break;
|
|
}
|
|
if (ch == CSS_ESCAPE) {
|
|
ch = ParseEscape(aErrorCode);
|
|
if (ch < 0) {
|
|
return PR_FALSE;
|
|
}
|
|
}
|
|
if (0 < ch) {
|
|
aBuffer.Append(PRUnichar(ch));
|
|
}
|
|
}
|
|
return PR_TRUE;
|
|
}
|
|
|
|
PRBool nsCSSScanner::ParseString(PRInt32& aErrorCode, PRInt32 aStop,
|
|
nsCSSToken& aToken)
|
|
{
|
|
aToken.mIdent.SetLength(0);
|
|
aToken.mType = eCSSToken_String;
|
|
aToken.mSymbol = PRUnichar(aStop); // remember how it's quoted
|
|
return GatherString(aErrorCode, aStop, aToken.mIdent);
|
|
}
|