124 lines
4.5 KiB
C++
124 lines
4.5 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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* The contents of this file are subject to the Mozilla Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the License.
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*
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* The Original Code is TransforMiiX XSLT processor.
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*
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* The Initial Developer of the Original Code is The MITRE Corporation.
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* Portions created by MITRE are Copyright (C) 1999 The MITRE Corporation.
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*
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* Portions created by Keith Visco as a Non MITRE employee,
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* (C) 1999 Keith Visco. All Rights Reserved.
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*
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* Contributor(s):
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* Keith Visco, kvisco@ziplink.net
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* -- original author.
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*
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*/
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/**
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* ExprParser
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* This class is used to parse XSL Expressions
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* @see ExprLexer
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**/
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#ifndef MITREXSL_EXPRPARSER_H
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#define MITREXSL_EXPRPARSER_H
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#include "baseutils.h"
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#include "nsIAtom.h"
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#include "txError.h"
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#include "Expr.h"
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class AttributeValueTemplate;
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class Expr;
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class txExprLexer;
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class FunctionCall;
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class LocationStep;
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class PredicateList;
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class Token;
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class txIParseContext;
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class txNodeTypeTest;
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class txExprParser
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{
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public:
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static nsresult createExpr(const nsASingleFragmentString& aExpression,
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txIParseContext* aContext, Expr** aExpr);
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/**
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* Creates an Attribute Value Template using the given value
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*/
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static AttributeValueTemplate* createAttributeValueTemplate
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(const nsAFlatString& attValue, txIParseContext* aContext);
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protected:
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/**
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* Using nsAutoPtr& to optimize passing the ownership to the
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* created binary expression objects.
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*/
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static nsresult createBinaryExpr(nsAutoPtr<Expr>& left,
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nsAutoPtr<Expr>& right, Token* op,
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Expr** aResult);
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static nsresult createExpr(txExprLexer& lexer, txIParseContext* aContext,
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Expr** aResult);
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static nsresult createFilter(txExprLexer& lexer, txIParseContext* aContext,
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Expr** aResult);
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static nsresult createFunctionCall(txExprLexer& lexer,
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txIParseContext* aContext,
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Expr** aResult);
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static nsresult createLocationStep(txExprLexer& lexer,
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txIParseContext* aContext,
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Expr** aResult);
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static nsresult createNodeTypeTest(txExprLexer& lexer,
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txNodeTest** aResult);
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static nsresult createPathExpr(txExprLexer& lexer,
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txIParseContext* aContext,
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Expr** aResult);
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static nsresult createUnionExpr(txExprLexer& lexer,
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txIParseContext* aContext,
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Expr** aResult);
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static PRBool isFilterExprToken(Token* aToken);
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static PRBool isLocationStepToken(Token* aToken);
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static PRBool isNodeTypeToken(Token* aToken);
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static short precedence(Token* aToken);
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/**
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* Resolve a QName, given the mContext parse context.
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* Returns prefix and localName as well as namespace ID
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*/
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static nsresult resolveQName(const nsAString& aQName, nsIAtom** aPrefix,
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txIParseContext* aContext,
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nsIAtom** aLocalName, PRInt32& aNamespace,
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PRBool aIsNameTest = MB_FALSE);
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/**
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* Using the given lexer, parses the tokens if they represent a
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* predicate list
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* If an error occurs a non-zero String pointer will be returned
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* containing the error message.
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* @param predicateList, the PredicateList to add predicate expressions to
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* @param lexer the ExprLexer to use for parsing tokens
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* @return 0 if successful, or a String pointer to the error message
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*/
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static nsresult parsePredicates(PredicateList* aPredicateList,
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txExprLexer& lexer,
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txIParseContext* aContext);
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static nsresult parseParameters(FunctionCall* aFnCall, txExprLexer& lexer,
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txIParseContext* aContext);
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};
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#endif
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