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