mirror of
https://github.com/mozilla/gecko-dev.git
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259 lines
8.7 KiB
C++
259 lines
8.7 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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/* tokenization of CSS style sheets */
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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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#include "nsCOMPtr.h"
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#include "mozilla/css/Loader.h"
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#include "nsCSSStyleSheet.h"
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class nsIUnicharInputStream;
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// XXX turn this off for minimo builds
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#define CSS_REPORT_PARSE_ERRORS
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#define CSS_BUFFER_SIZE 256
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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, // mIdent
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// A css at keyword (e.g. @foo)
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eCSSToken_AtKeyword, // 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, // mNumber
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eCSSToken_Percentage, // mNumber
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eCSSToken_Dimension, // mNumber + mIdent
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// A css string (e.g. "foo" or 'foo')
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eCSSToken_String, // mSymbol + mIdent + mSymbol
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// Whitespace (e.g. " " or "/* abc */")
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eCSSToken_WhiteSpace, // mIdent
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// A css symbol (e.g. ':', ';', '+', etc.)
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eCSSToken_Symbol, // mSymbol
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// A css1 id (e.g. #foo3)
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eCSSToken_ID, // mIdent
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// Just like eCSSToken_ID, except the part following the '#' is not
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// a valid CSS identifier (eg. starts with a digit, is the empty
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// string, etc).
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eCSSToken_Ref, // mIdent
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eCSSToken_Function, // mIdent
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eCSSToken_URL, // mIdent + mSymbol
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eCSSToken_Bad_URL, // mIdent + mSymbol
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eCSSToken_HTMLComment, // "<!--" or "-->"
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eCSSToken_Includes, // "~="
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eCSSToken_Dashmatch, // "|="
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eCSSToken_Beginsmatch, // "^="
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eCSSToken_Endsmatch, // "$="
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eCSSToken_Containsmatch, // "*="
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eCSSToken_URange, // Low in mInteger, high in mInteger2;
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// mIntegerValid is true if the token is a
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// valid range; mIdent preserves the textual
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// form of the token for error reporting
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// An unterminated string, which is always an error.
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eCSSToken_Bad_String // mSymbol + mIdent
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};
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struct nsCSSToken {
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nsAutoString mIdent NS_OKONHEAP;
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float mNumber;
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PRInt32 mInteger;
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PRInt32 mInteger2;
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nsCSSTokenType mType;
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PRUnichar mSymbol;
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PRPackedBool mIntegerValid; // for number, dimension, urange
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PRPackedBool mHasSign; // for number, percentage, and dimension
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nsCSSToken();
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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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// |aLineNumber == 1| is the beginning of a file, use |aLineNumber == 0|
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// when the line number is unknown.
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// Either aInput or (aBuffer and aCount) must be set.
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void Init(nsIUnicharInputStream* aInput,
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const PRUnichar *aBuffer, PRUint32 aCount,
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nsIURI* aURI, PRUint32 aLineNumber,
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nsCSSStyleSheet* aSheet, mozilla::css::Loader* aLoader);
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void Close();
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static PRBool InitGlobals();
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static void ReleaseGlobals();
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// Set whether or not we are processing SVG
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void SetSVGMode(PRBool aSVGMode) {
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NS_ASSERTION(aSVGMode == PR_TRUE || aSVGMode == PR_FALSE,
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"bad PRBool value");
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mSVGMode = aSVGMode;
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}
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PRBool IsSVGMode() const {
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return mSVGMode;
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}
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#ifdef CSS_REPORT_PARSE_ERRORS
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void AddToError(const nsSubstring& aErrorText);
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void OutputError();
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void ClearError();
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// aMessage must take no parameters
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void ReportUnexpected(const char* aMessage);
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void ReportUnexpectedParams(const char* aMessage,
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const PRUnichar **aParams,
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PRUint32 aParamsLength);
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// aLookingFor is a plain string, not a format string
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void ReportUnexpectedEOF(const char* aLookingFor);
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// aLookingFor is a single character
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void ReportUnexpectedEOF(PRUnichar aLookingFor);
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// aMessage must take 1 parameter (for the string representation of the
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// unexpected token)
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void ReportUnexpectedToken(nsCSSToken& tok, const char *aMessage);
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// aParams's first entry must be null, and we'll fill in the token
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void ReportUnexpectedTokenParams(nsCSSToken& tok,
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const char* aMessage,
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const PRUnichar **aParams,
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PRUint32 aParamsLength);
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#endif
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PRUint32 GetLineNumber() { return mLineNumber; }
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// Get the next token. Return PR_FALSE on EOF. aTokenResult
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// is filled in with the data for the token.
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PRBool Next(nsCSSToken& aTokenResult);
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// Get the next token that may be a string or unquoted URL
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PRBool NextURL(nsCSSToken& aTokenResult);
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// It's really ugly that we have to expose this, but it's the easiest
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// way to do :nth-child() parsing sanely. (In particular, in
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// :nth-child(2n-1), "2n-1" is a dimension, and we need to push the
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// "-1" back so we can read it again as a number.)
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void Pushback(PRUnichar aChar);
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// Reports operating-system level errors, e.g. read failures and
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// out of memory.
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nsresult GetLowLevelError();
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// sometimes the parser wants to make note of a low-level error
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void SetLowLevelError(nsresult aErrorCode);
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protected:
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PRBool EnsureData();
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PRInt32 Read();
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PRInt32 Peek();
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PRBool LookAhead(PRUnichar aChar);
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PRBool LookAheadOrEOF(PRUnichar aChar); // expect either aChar or EOF
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void EatWhiteSpace();
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void ParseAndAppendEscape(nsString& aOutput);
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PRBool ParseIdent(PRInt32 aChar, nsCSSToken& aResult);
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PRBool ParseAtKeyword(PRInt32 aChar, nsCSSToken& aResult);
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PRBool ParseNumber(PRInt32 aChar, nsCSSToken& aResult);
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PRBool ParseRef(PRInt32 aChar, nsCSSToken& aResult);
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PRBool ParseString(PRInt32 aChar, nsCSSToken& aResult);
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PRBool ParseURange(PRInt32 aChar, nsCSSToken& aResult);
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PRBool SkipCComment();
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PRBool GatherIdent(PRInt32 aChar, nsString& aIdent);
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// Only used when input is a stream
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nsCOMPtr<nsIUnicharInputStream> mInputStream;
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PRUnichar mBuffer[CSS_BUFFER_SIZE];
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const PRUnichar *mReadPointer;
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PRUint32 mOffset;
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PRUint32 mCount;
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PRUnichar* mPushback;
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PRInt32 mPushbackCount;
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PRInt32 mPushbackSize;
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PRUnichar mLocalPushback[4];
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nsresult mLowLevelError;
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PRUint32 mLineNumber;
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// True if we are in SVG mode; false in "normal" CSS
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PRPackedBool mSVGMode;
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#ifdef CSS_REPORT_PARSE_ERRORS
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nsXPIDLCString mFileName;
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nsCOMPtr<nsIURI> mURI; // Cached so we know to not refetch mFileName
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PRUint32 mErrorLineNumber, mColNumber, mErrorColNumber;
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nsFixedString mError;
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PRUnichar mErrorBuf[200];
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PRUint64 mWindowID;
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PRBool mWindowIDCached;
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nsCSSStyleSheet* mSheet;
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mozilla::css::Loader* mLoader;
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#endif
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};
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#endif /* nsCSSScanner_h___ */
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