Operator.cs

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using System.Xml.XPath;
 
namespace MS.Internal.Xml.XPath;
 
internal sealed class Operator : AstNode
{
    public enum Op
    {
        INVALID,
        OR,
        AND,
        EQ,
        NE,
        LT,
        LE,
        GT,
        GE,
        PLUS,
        MINUS,
        MUL,
        DIV,
        MOD,
        UNION
    }
 
    private static readonly Op[] s_invertOp = new Op[9]
    {
        Op.INVALID,
        Op.INVALID,
        Op.INVALID,
        Op.EQ,
        Op.NE,
        Op.GT,
        Op.GE,
        Op.LT,
        Op.LE
    };
 
    private readonly Op _opType;
 
    private readonly AstNode _opnd1;
 
    private readonly AstNode _opnd2;
 
    public override AstType Type => 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 => _opType;
 
    public AstNode Operand1 => _opnd1;
 
    public AstNode Operand2 => _opnd2;
 
    public static Op InvertOperator(Op op)
    {
        return s_invertOp[(int)op];
    }
 
    public Operator(Op op, AstNode opnd1, AstNode opnd2)
    {
        _opType = op;
        _opnd1 = opnd1;
        _opnd2 = opnd2;
    }
}