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110 lines
4.1 KiB
C++
110 lines
4.1 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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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 "txCore.h"
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#include "nsAutoPtr.h"
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#include "nsString.h"
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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 nsIAtom;
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class PredicateList;
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class Token;
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class txIParseContext;
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class txNodeTest;
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class txExprParser
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{
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public:
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static nsresult createExpr(const nsSubstring& aExpression,
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txIParseContext* aContext, Expr** aExpr)
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{
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return createExprInternal(aExpression, 0, aContext, aExpr);
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}
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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 nsresult createAVT(const nsSubstring& aAttrValue,
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txIParseContext* aContext,
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Expr** aResult);
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protected:
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static nsresult createExprInternal(const nsSubstring& aExpression,
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uint32_t aSubStringPos,
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txIParseContext* aContext,
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Expr** aExpr);
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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 createFilterOrStep(txExprLexer& lexer,
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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 bool isLocationStepToken(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, int32_t& aNamespace,
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bool aIsNameTest = 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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