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