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ExprParser.h
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00001 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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 TransforMiiX XSLT processor code.
00016  *
00017  * The Initial Developer of the Original Code is
00018  * The MITRE Corporation.
00019  * Portions created by the Initial Developer are Copyright (C) 1999
00020  * the Initial Developer. All Rights Reserved.
00021  *
00022  * Contributor(s):
00023  *   Keith Visco <kvisco@ziplink.net> (Original Author)
00024  *
00025  * Alternatively, the contents of this file may be used under the terms of
00026  * either the GNU General Public License Version 2 or later (the "GPL"), or
00027  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
00028  * in which case the provisions of the GPL or the LGPL are applicable instead
00029  * of those above. If you wish to allow use of your version of this file only
00030  * under the terms of either the GPL or the LGPL, and not to allow others to
00031  * use your version of this file under the terms of the MPL, indicate your
00032  * decision by deleting the provisions above and replace them with the notice
00033  * and other provisions required by the GPL or the LGPL. If you do not delete
00034  * the provisions above, a recipient may use your version of this file under
00035  * the terms of any one of the MPL, the GPL or the LGPL.
00036  *
00037  * ***** END LICENSE BLOCK ***** */
00038 
00045 #ifndef MITREXSL_EXPRPARSER_H
00046 #define MITREXSL_EXPRPARSER_H
00047 
00048 #include "txCore.h"
00049 #include "nsAutoPtr.h"
00050 #include "nsString.h"
00051 
00052 class AttributeValueTemplate;
00053 class Expr;
00054 class txExprLexer;
00055 class FunctionCall;
00056 class LocationStep;
00057 class nsIAtom;
00058 class PredicateList;
00059 class Token;
00060 class txIParseContext;
00061 class txNodeTest;
00062 class txNodeTypeTest;
00063 
00064 class txExprParser
00065 {
00066 public:
00067 
00068     static nsresult createExpr(const nsASingleFragmentString& aExpression,
00069                                txIParseContext* aContext, Expr** aExpr);
00070 
00074     static AttributeValueTemplate* createAttributeValueTemplate
00075         (const nsAFlatString& attValue, txIParseContext* aContext);
00076 
00077 
00078 protected:
00083     static nsresult createBinaryExpr(nsAutoPtr<Expr>& left,
00084                                      nsAutoPtr<Expr>& right, Token* op,
00085                                      Expr** aResult);
00086     static nsresult createExpr(txExprLexer& lexer, txIParseContext* aContext,
00087                                Expr** aResult);
00088     static nsresult createFilter(txExprLexer& lexer, txIParseContext* aContext,
00089                                  Expr** aResult);
00090     static nsresult createFunctionCall(txExprLexer& lexer,
00091                                        txIParseContext* aContext,
00092                                        Expr** aResult);
00093     static nsresult createLocationStep(txExprLexer& lexer,
00094                                        txIParseContext* aContext,
00095                                        Expr** aResult);
00096     static nsresult createNodeTypeTest(txExprLexer& lexer,
00097                                        txNodeTest** aResult);
00098     static nsresult createPathExpr(txExprLexer& lexer,
00099                                    txIParseContext* aContext,
00100                                    Expr** aResult);
00101     static nsresult createUnionExpr(txExprLexer& lexer,
00102                                     txIParseContext* aContext,
00103                                     Expr** aResult);
00104                   
00105     static PRBool isFilterExprToken(Token* aToken);
00106     static PRBool isLocationStepToken(Token* aToken);
00107     static PRBool isNodeTypeToken(Token* aToken);
00108                   
00109     static short precedence(Token* aToken);
00110 
00115     static nsresult resolveQName(const nsAString& aQName, nsIAtom** aPrefix,
00116                                  txIParseContext* aContext,
00117                                  nsIAtom** aLocalName, PRInt32& aNamespace,
00118                                  PRBool aIsNameTest = MB_FALSE);
00119 
00129     static nsresult parsePredicates(PredicateList* aPredicateList,
00130                                     txExprLexer& lexer,
00131                                     txIParseContext* aContext);
00132     static nsresult parseParameters(FunctionCall* aFnCall, txExprLexer& lexer,
00133                                     txIParseContext* aContext);
00134 
00135 };
00136 
00137 #endif