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//------------------------------------------------------------------------------
// <copyright file="Operator.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
// <owner current="true" primary="true">Microsoft</owner>
//------------------------------------------------------------------------------
namespace MS.Internal.Xml.XPath {
using System;
using System.Xml;
using System.Xml.XPath;
using System.Diagnostics;
using System.Globalization;
internal class Operator : AstNode {
public enum Op { // order is alligned with XPathOperator
INVALID,
/*Logical */
OR,
AND,
/*Equality */
EQ,
NE,
/*Relational*/
LT,
LE,
GT,
GE,
/*Arithmetic*/
PLUS,
MINUS,
MUL,
DIV,
MOD,
/*Union */
UNION,
};
static Op[] invertOp = {
/*INVALID*/ Op.INVALID,
/*OR */ Op.INVALID,
/*END */ Op.INVALID,
/*EQ */ Op.EQ,
/*NE */ Op.NE,
/*LT */ Op.GT,
/*LE */ Op.GE,
/*GT */ Op.LT,
/*GE */ Op.LE,
};
static public Operator.Op InvertOperator(Operator.Op op) {
Debug.Assert(Op.EQ <= op && op <= Op.GE);
return invertOp[(int)op];
}
private Op opType;
private AstNode opnd1;
private AstNode opnd2;
public Operator(Op op, AstNode opnd1, AstNode opnd2) {
this.opType = op;
this.opnd1 = opnd1;
this.opnd2 = opnd2;
}
public override AstType Type { get {return AstType.Operator;} }
public override XPathResultType ReturnType {
get {
if (opType <= Op.GE) {
return XPathResultType.Boolean;
}
if (opType <= Op.MOD) {
return XPathResultType.Number;
}
return XPathResultType.NodeSet;
}
}
public Op OperatorType { get { return opType; } }
public AstNode Operand1 { get { return opnd1; } }
public AstNode Operand2 { get { return opnd2; } }
}
}
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