зеркало из https://github.com/mozilla/gecko-dev.git
220 строки
6.9 KiB
C++
220 строки
6.9 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* 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
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* L. David Baron <dbaron@dbaron.org>
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* Daniel Glazman <glazman@netscape.com>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef nsCSSScanner_h___
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#define nsCSSScanner_h___
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#include "nsString.h"
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class nsIUnicharInputStream;
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// for testing
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#ifdef DEBUG
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#define CSS_REPORT_PARSE_ERRORS
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#endif
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// for #ifdef CSS_REPORT_PARSE_ERRORS
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#include "nsXPIDLString.h"
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class nsIURI;
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// Token types
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enum nsCSSTokenType {
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// A css identifier (e.g. foo)
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eCSSToken_Ident = 0, // mIdent
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// A css at keyword (e.g. @foo)
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eCSSToken_AtKeyword = 1, // mIdent
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// A css number without a percentage or dimension; with percentage;
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// without percentage but with a dimension
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eCSSToken_Number = 2, // mNumber
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eCSSToken_Percentage = 3, // mNumber
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eCSSToken_Dimension = 4, // mNumber + mIdent
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// A css string (e.g. "foo" or 'foo')
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eCSSToken_String = 5, // mSymbol + mIdent + mSymbol
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// Whitespace (e.g. " " or "/* abc */")
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eCSSToken_WhiteSpace = 6, // mIdent
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// A css symbol (e.g. ':', ';', '+', etc.)
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eCSSToken_Symbol = 7, // mSymbol
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// A css1 id (e.g. #foo3)
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eCSSToken_ID = 8, // mIdent
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eCSSToken_Function = 9, // mIdent
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eCSSToken_URL = 10, // mIdent
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eCSSToken_InvalidURL = 11, // doesn't matter
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eCSSToken_HTMLComment = 12, // "<!--" or "-->"
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eCSSToken_Includes = 13, // "~="
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eCSSToken_Dashmatch = 14, // "|="
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eCSSToken_Beginsmatch = 15, // "^="
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eCSSToken_Endsmatch = 16, // "$="
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eCSSToken_Containsmatch = 17 // "*="
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};
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struct nsCSSToken {
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nsCSSTokenType mType;
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PRPackedBool mIntegerValid;
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nsAutoString mIdent;
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float mNumber;
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PRInt32 mInteger;
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PRUnichar mSymbol;
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nsCSSToken();
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PRBool IsDimension() {
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return PRBool((eCSSToken_Dimension == mType) ||
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((eCSSToken_Number == mType) && (mNumber == 0.0f)));
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}
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PRBool IsSymbol(PRUnichar aSymbol) {
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return PRBool((eCSSToken_Symbol == mType) && (mSymbol == aSymbol));
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}
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void AppendToString(nsString& aBuffer);
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};
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// CSS Scanner API. Used to tokenize an input stream using the CSS
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// forward compatible tokenization rules. This implementation is
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// private to this package and is only used internally by the css
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// parser.
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class nsCSSScanner {
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public:
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nsCSSScanner();
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~nsCSSScanner();
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// Init the scanner.
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void Init(nsIUnicharInputStream* aInput, nsIURI* aURI);
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#ifdef CSS_REPORT_PARSE_ERRORS
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void AddToError(const nsAString& aErrorText);
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void OutputError();
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void ClearError();
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#endif
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PRUint32 GetLineNumber();
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// Get the next token. Return nsfalse on EOF or ERROR. aTokenResult
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// is filled in with the data for the token.
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PRBool Next(nsresult& aErrorCode, nsCSSToken& aTokenResult);
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// Get the next token that may be a string or unquoted URL or whitespace
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PRBool NextURL(nsresult& aErrorCode, nsCSSToken& aTokenResult);
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static inline PRBool
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IsIdentStart(PRInt32 aChar, const PRUint8* aLexTable)
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{
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return aChar >= 0 &&
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(aChar >= 256 || (aLexTable[aChar] & START_IDENT) != 0);
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}
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static inline PRBool
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StartsIdent(PRInt32 aFirstChar, PRInt32 aSecondChar,
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const PRUint8* aLexTable)
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{
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return IsIdentStart(aFirstChar, aLexTable) ||
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(aFirstChar == '-' && IsIdentStart(aSecondChar, aLexTable));
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}
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static inline const PRUint8* GetLexTable() {
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return gLexTable;
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}
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protected:
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void Close();
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PRInt32 Read(nsresult& aErrorCode);
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PRInt32 Peek(nsresult& aErrorCode);
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void Unread();
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void Pushback(PRUnichar aChar);
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PRBool LookAhead(nsresult& aErrorCode, PRUnichar aChar);
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PRBool EatWhiteSpace(nsresult& aErrorCode);
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PRBool EatNewline(nsresult& aErrorCode);
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PRInt32 ParseEscape(nsresult& aErrorCode);
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PRBool ParseIdent(nsresult& aErrorCode, PRInt32 aChar, nsCSSToken& aResult);
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PRBool ParseAtKeyword(nsresult& aErrorCode, PRInt32 aChar,
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nsCSSToken& aResult);
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PRBool ParseNumber(nsresult& aErrorCode, PRInt32 aChar, nsCSSToken& aResult);
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PRBool ParseID(nsresult& aErrorCode, PRInt32 aChar, nsCSSToken& aResult);
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PRBool ParseString(nsresult& aErrorCode, PRInt32 aChar, nsCSSToken& aResult);
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#if 0
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PRBool ParseEOLComment(nsresult& aErrorCode, nsCSSToken& aResult);
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PRBool ParseCComment(nsresult& aErrorCode, nsCSSToken& aResult);
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#endif
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PRBool SkipCComment(nsresult& aErrorCode);
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PRBool GatherString(nsresult& aErrorCode, PRInt32 aStop,
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nsString& aString);
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PRBool GatherIdent(nsresult& aErrorCode, PRInt32 aChar, nsString& aIdent);
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nsIUnicharInputStream* mInput;
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PRUnichar* mBuffer;
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PRInt32 mOffset;
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PRInt32 mCount;
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PRUnichar* mPushback;
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PRInt32 mPushbackCount;
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PRInt32 mPushbackSize;
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PRInt32 mLastRead;
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PRUnichar mLocalPushback[4];
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PRUint32 mLineNumber;
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#ifdef CSS_REPORT_PARSE_ERRORS
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nsXPIDLCString mFileName;
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PRUint32 mErrorLineNumber, mColNumber, mErrorColNumber;
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nsString mError;
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#endif
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static const PRUint8 IS_DIGIT;
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static const PRUint8 IS_HEX_DIGIT;
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static const PRUint8 IS_ALPHA;
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static const PRUint8 START_IDENT;
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static const PRUint8 IS_IDENT;
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static const PRUint8 IS_WHITESPACE;
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static PRUint8 gLexTable[256];
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static void BuildLexTable();
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static PRBool CheckLexTable(PRInt32 aChar, PRUint8 aBit, PRUint8* aLexTable);
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};
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#endif /* nsCSSScanner_h___ */
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