gecko-dev/layout/style/nsCSSScanner.h
1999-06-10 05:27:01 +00:00

136 lines
4.3 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* The contents of this file are subject to the Netscape Public License
* Version 1.0 (the "NPL"); you may not use this file except in
* compliance with the NPL. You may obtain a copy of the NPL at
* http://www.mozilla.org/NPL/
*
* Software distributed under the NPL is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
* for the specific language governing rights and limitations under the
* NPL.
*
* The Initial Developer of this code under the NPL is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All Rights
* Reserved.
*/
#ifndef nsCSSScanner_h___
#define nsCSSScanner_h___
#include "nsString.h"
class nsIUnicharInputStream;
// 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 "--{w}>"
};
struct nsCSSToken {
nsCSSTokenType mType;
nsAutoString mIdent;
float mNumber;
PRInt32 mInteger;
PRBool mIntegerValid;
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);
// 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);
PRBool ParseEOLComment(PRInt32& aErrorCode, nsCSSToken& aResult);
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];
};
#endif /* nsCSSScanner_h___ */