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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* 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 code.
*
* The Initial Developer of the Original Code is
* The MITRE Corporation.
* Portions created by the Initial Developer are Copyright (C) 1999
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Keith Visco <kvisco@ziplink.net> (Original Author)
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
/**
* ExprParser
* This class is used to parse XSL Expressions
* @see ExprLexer
**/
#ifndef MITREXSL_EXPRPARSER_H
#define MITREXSL_EXPRPARSER_H
#include "txCore.h"
#include "nsAutoPtr.h"
#include "nsString.h"
class AttributeValueTemplate;
class Expr;
class txExprLexer;
class FunctionCall;
class LocationStep;
class nsIAtom;
class PredicateList;
class Token;
class txIParseContext;
class txNodeTest;
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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