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lightning-sunbird  0.9+nobinonly
nsXFormsXPathParser.h
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00001 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
00002 /* ***** BEGIN LICENSE BLOCK *****
00003  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
00004  *
00005  * The contents of this file are subject to the Mozilla Public License Version
00006  * 1.1 (the "License"); you may not use this file except in compliance with
00007  * the License. You may obtain a copy of the License at
00008  * http://www.mozilla.org/MPL/
00009  *
00010  * Software distributed under the License is distributed on an "AS IS" basis,
00011  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
00012  * for the specific language governing rights and limitations under the
00013  * License.
00014  *
00015  * The Original Code is Mozilla XForms support.
00016  *
00017  * The Initial Developer of the Original Code is
00018  * Novell, Inc.
00019  * Portions created by the Initial Developer are Copyright (C) 2004
00020  * the Initial Developer. All Rights Reserved.
00021  *
00022  * Contributor(s):
00023  *  Allan Beaufour <abeaufour@novell.com>
00024  *  David Landwehr <dlandwehr@novell.com>
00025  *
00026  * Alternatively, the contents of this file may be used under the terms of
00027  * either the GNU General Public License Version 2 or later (the "GPL"), or
00028  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
00029  * in which case the provisions of the GPL or the LGPL are applicable instead
00030  * of those above. If you wish to allow use of your version of this file only
00031  * under the terms of either the GPL or the LGPL, and not to allow others to
00032  * use your version of this file under the terms of the MPL, indicate your
00033  * decision by deleting the provisions above and replace them with the notice
00034  * and other provisions required by the GPL or the LGPL. If you do not delete
00035  * the provisions above, a recipient may use your version of this file under
00036  * the terms of any one of the MPL, the GPL or the LGPL.
00037  *
00038  * ***** END LICENSE BLOCK ***** */
00039 
00040 #include "nsXFormsXPathScanner.h"
00041 #include "nsXFormsXPathNode.h"
00042 
00043 #define ANALYZE_STACK_SIZE 120
00044 
00052 class nsXFormsXPathParser {
00053 private:
00054   nsXFormsXPathScanner mScanner;
00055   nsXFormsXPathScanner::XPATHTOKEN mPeek;
00056   
00057   PRBool mUsesDynamicFunc;
00058   
00059   nsXFormsXPathNode* mHead;
00060   int mAnalyzeStackPointer;
00061   int mPredicateLevel;
00062   nsXFormsXPathNode* mStack[ANALYZE_STACK_SIZE];
00063 
00064   nsXFormsXPathScanner::XPATHTOKEN PeekToken();
00065   nsXFormsXPathScanner::XPATHTOKEN PopToken();
00066 
00067   void PushContext(PRInt32 aStartIndex = -100);
00068   void PushContext(nsXFormsXPathNode* mAnalyze);
00069   void EndContext();
00070   void RestartContext();
00071   nsXFormsXPathNode* JustContext();
00072   nsXFormsXPathNode* PopContext();
00073   
00074   PRBool DoRelative();
00075 
00076   void AbbreviatedStep();
00077   void AbsoluteLocationPath();
00078   void AdditiveExpression();
00079   void AndExpr();
00080   void AxisSpecifier();
00081   void EqualityExpr();
00082   void Expr();
00083   void FilterExpr();
00084   void FunctionCall();
00085   void LocationPath();
00086   void MultiplicationExpr();
00087   void NameTest();
00088   void NodeTest();
00089   void NodeType();
00090   void OrExpr();
00091   void PathExpr();
00092   void Predicate();
00093   PRBool PrimaryExpr();
00094   void RelationalExpression();
00095   void RelativeLocationPath();
00096   void Step();
00097   void UnaryExpr();
00098   void UnionExpr();
00099 
00100 #ifdef DEBUG_XF_PARSER
00101   void Dump(nsXFormsXPathNode* aNode);
00102   void DumpWithLevel(nsXFormsXPathNode* aNode, PRInt32 aLevel);
00103   void OutputSubExpression(PRInt32 aOffset, PRInt32 aEndOffset);
00104 #endif
00105 
00106 public:
00107   nsXFormsXPathParser();
00108   ~nsXFormsXPathParser();
00109   
00110   nsXFormsXPathNode* Parse(const nsAString& aExpression);
00111   PRBool UsesDynamicFunc() const;
00112 };