gecko-dev/layout/style/nsCSSScanner.h

191 lines
6.0 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: NPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Netscape 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/NPL/
*
* 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@fas.harvard.edu>
* Daniel Glazman <glazman@netscape.com>
*
*
* Alternatively, the contents of this file may be used under the terms of
* either 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 NPL, 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 NPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#ifndef nsCSSScanner_h___
#define nsCSSScanner_h___
#include "nsString.h"
class nsIUnicharInputStream;
// for testing
#ifdef DEBUG_dbaron
#define CSS_REPORT_PARSE_ERRORS
#endif
// for #ifdef CSS_REPORT_PARSE_ERRORS
#include "nsXPIDLString.h"
class nsIURI;
// Token types
enum nsCSSTokenType {
// A css identifier (e.g. foo)
eCSSToken_Ident = 0, // mIdent
// A css at keyword (e.g. @foo)
eCSSToken_AtKeyword = 1, // mIdent
// A css number without a percentage or dimension; with percentage;
// without percentage but with a dimension
eCSSToken_Number = 2, // mNumber
eCSSToken_Percentage = 3, // mNumber
eCSSToken_Dimension = 4, // mNumber + mIdent
// A css string (e.g. "foo" or 'foo')
eCSSToken_String = 5, // mSymbol + mIdent + mSymbol
// Whitespace (e.g. " " or "/* abc */")
eCSSToken_WhiteSpace = 6, // mIdent
// A css symbol (e.g. ':', ';', '+', etc.)
eCSSToken_Symbol = 7, // mSymbol
// A css1 id (e.g. #foo3)
eCSSToken_ID = 8, // mIdent
eCSSToken_Function = 9, // mIdent
eCSSToken_URL = 10, // mIdent
eCSSToken_InvalidURL = 11, // doesn't matter
eCSSToken_HTMLComment = 12, // "<!--" or "-->"
eCSSToken_Includes = 13, // "~="
eCSSToken_Dashmatch = 14, // "|="
eCSSToken_Beginsmatch = 15, // "^="
eCSSToken_Endsmatch = 16, // "$="
eCSSToken_Containsmatch = 17 // "*="
};
struct nsCSSToken {
nsCSSTokenType mType;
PRPackedBool mIntegerValid;
nsAutoString mIdent;
float mNumber;
PRInt32 mInteger;
PRUnichar mSymbol;
nsCSSToken();
PRBool IsDimension() {
return PRBool((eCSSToken_Dimension == mType) ||
((eCSSToken_Number == mType) && (mNumber == 0.0f)));
}
PRBool IsSymbol(PRUnichar aSymbol) {
return PRBool((eCSSToken_Symbol == mType) && (mSymbol == aSymbol));
}
void AppendToString(nsString& aBuffer);
};
// CSS Scanner API. Used to tokenize an input stream using the CSS
// forward compatible tokenization rules. This implementation is
// private to this package and is only used internally by the css
// parser.
class nsCSSScanner {
public:
nsCSSScanner();
~nsCSSScanner();
// Init the scanner.
void Init(nsIUnicharInputStream* aInput, nsIURI* aURI);
#ifdef CSS_REPORT_PARSE_ERRORS
void AddToError(const nsAString& aErrorText);
void OutputError();
void ClearError();
#endif
PRUint32 GetLineNumber();
// Get the next token. Return nsfalse on EOF or ERROR. aTokenResult
// is filled in with the data for the token.
PRBool Next(PRInt32& aErrorCode, nsCSSToken& aTokenResult);
// Get the next token that may be a string or unquoted URL or whitespace
PRBool NextURL(PRInt32& aErrorCode, nsCSSToken& aTokenResult);
protected:
void Close();
PRInt32 Read(PRInt32& aErrorCode);
PRInt32 Peek(PRInt32& aErrorCode);
void Unread();
void Pushback(PRUnichar aChar);
PRBool LookAhead(PRInt32& aErrorCode, PRUnichar aChar);
PRBool EatWhiteSpace(PRInt32& aErrorCode);
PRBool EatNewline(PRInt32& aErrorCode);
PRInt32 ParseEscape(PRInt32& aErrorCode);
PRBool ParseIdent(PRInt32& aErrorCode, PRInt32 aChar, nsCSSToken& aResult);
PRBool ParseAtKeyword(PRInt32& aErrorCode, PRInt32 aChar,
nsCSSToken& aResult);
PRBool ParseNumber(PRInt32& aErrorCode, PRInt32 aChar, nsCSSToken& aResult);
PRBool ParseID(PRInt32& aErrorCode, PRInt32 aChar, nsCSSToken& aResult);
PRBool ParseString(PRInt32& aErrorCode, PRInt32 aChar, nsCSSToken& aResult);
#if 0
PRBool ParseEOLComment(PRInt32& aErrorCode, nsCSSToken& aResult);
#endif
PRBool ParseCComment(PRInt32& aErrorCode, nsCSSToken& aResult);
PRBool GatherString(PRInt32& aErrorCode, PRInt32 aStop,
nsString& aString);
PRBool GatherIdent(PRInt32& aErrorCode, PRInt32 aChar, nsString& aIdent);
nsIUnicharInputStream* mInput;
PRUnichar* mBuffer;
PRInt32 mOffset;
PRInt32 mCount;
PRUnichar* mPushback;
PRInt32 mPushbackCount;
PRInt32 mPushbackSize;
PRInt32 mLastRead;
PRUnichar mLocalPushback[4];
PRUint32 mLineNumber;
#ifdef CSS_REPORT_PARSE_ERRORS
nsXPIDLCString mFileName;
PRUint32 mErrorLineNumber, mColNumber, mErrorColNumber;
nsString mError;
#endif
};
#endif /* nsCSSScanner_h___ */