michael@0: /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: /**
michael@0:  * ExprParser
michael@0:  * This class is used to parse XSL Expressions
michael@0:  * @see ExprLexer
michael@0: **/
michael@0: 
michael@0: #ifndef MITREXSL_EXPRPARSER_H
michael@0: #define MITREXSL_EXPRPARSER_H
michael@0: 
michael@0: #include "txCore.h"
michael@0: #include "nsAutoPtr.h"
michael@0: #include "nsString.h"
michael@0: 
michael@0: class AttributeValueTemplate;
michael@0: class Expr;
michael@0: class txExprLexer;
michael@0: class FunctionCall;
michael@0: class LocationStep;
michael@0: class nsIAtom;
michael@0: class PredicateList;
michael@0: class Token;
michael@0: class txIParseContext;
michael@0: class txNodeTest;
michael@0: class txNodeTypeTest;
michael@0: 
michael@0: class txExprParser
michael@0: {
michael@0: public:
michael@0: 
michael@0:     static nsresult createExpr(const nsSubstring& aExpression,
michael@0:                                txIParseContext* aContext, Expr** aExpr)
michael@0:     {
michael@0:         return createExprInternal(aExpression, 0, aContext, aExpr);
michael@0:     }
michael@0: 
michael@0:     /**
michael@0:      * Creates an Attribute Value Template using the given value
michael@0:      */
michael@0:     static nsresult createAVT(const nsSubstring& aAttrValue,
michael@0:                               txIParseContext* aContext,
michael@0:                               Expr** aResult);
michael@0: 
michael@0: 
michael@0: protected:
michael@0:     static nsresult createExprInternal(const nsSubstring& aExpression,
michael@0:                                        uint32_t aSubStringPos,
michael@0:                                        txIParseContext* aContext,
michael@0:                                        Expr** aExpr);
michael@0:     /**
michael@0:      * Using nsAutoPtr& to optimize passing the ownership to the
michael@0:      * created binary expression objects.
michael@0:      */
michael@0:     static nsresult createBinaryExpr(nsAutoPtr<Expr>& left,
michael@0:                                      nsAutoPtr<Expr>& right, Token* op,
michael@0:                                      Expr** aResult);
michael@0:     static nsresult createExpr(txExprLexer& lexer, txIParseContext* aContext,
michael@0:                                Expr** aResult);
michael@0:     static nsresult createFilterOrStep(txExprLexer& lexer,
michael@0:                                        txIParseContext* aContext,
michael@0:                                        Expr** aResult);
michael@0:     static nsresult createFunctionCall(txExprLexer& lexer,
michael@0:                                        txIParseContext* aContext,
michael@0:                                        Expr** aResult);
michael@0:     static nsresult createLocationStep(txExprLexer& lexer,
michael@0:                                        txIParseContext* aContext,
michael@0:                                        Expr** aResult);
michael@0:     static nsresult createNodeTypeTest(txExprLexer& lexer,
michael@0:                                        txNodeTest** aResult);
michael@0:     static nsresult createPathExpr(txExprLexer& lexer,
michael@0:                                    txIParseContext* aContext,
michael@0:                                    Expr** aResult);
michael@0:     static nsresult createUnionExpr(txExprLexer& lexer,
michael@0:                                     txIParseContext* aContext,
michael@0:                                     Expr** aResult);
michael@0:                   
michael@0:     static bool isLocationStepToken(Token* aToken);
michael@0:                   
michael@0:     static short precedence(Token* aToken);
michael@0: 
michael@0:     /**
michael@0:      * Resolve a QName, given the mContext parse context.
michael@0:      * Returns prefix and localName as well as namespace ID
michael@0:      */
michael@0:     static nsresult resolveQName(const nsAString& aQName, nsIAtom** aPrefix,
michael@0:                                  txIParseContext* aContext,
michael@0:                                  nsIAtom** aLocalName, int32_t& aNamespace,
michael@0:                                  bool aIsNameTest = false);
michael@0: 
michael@0:     /**
michael@0:      * Using the given lexer, parses the tokens if they represent a
michael@0:      * predicate list
michael@0:      * If an error occurs a non-zero String pointer will be returned
michael@0:      * containing the error message.
michael@0:      * @param predicateList, the PredicateList to add predicate expressions to
michael@0:      * @param lexer the ExprLexer to use for parsing tokens
michael@0:      * @return 0 if successful, or a String pointer to the error message
michael@0:      */
michael@0:     static nsresult parsePredicates(PredicateList* aPredicateList,
michael@0:                                     txExprLexer& lexer,
michael@0:                                     txIParseContext* aContext);
michael@0:     static nsresult parseParameters(FunctionCall* aFnCall, txExprLexer& lexer,
michael@0:                                     txIParseContext* aContext);
michael@0: 
michael@0: };
michael@0: 
michael@0: #endif