Function.cs

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using System.Collections.Generic;
using System.Xml.XPath;
 
namespace MS.Internal.Xml.XPath;
 
internal sealed class Function : AstNode
{
    public enum FunctionType
    {
        FuncLast,
        FuncPosition,
        FuncCount,
        FuncID,
        FuncLocalName,
        FuncNameSpaceUri,
        FuncName,
        FuncString,
        FuncBoolean,
        FuncNumber,
        FuncTrue,
        FuncFalse,
        FuncNot,
        FuncConcat,
        FuncStartsWith,
        FuncContains,
        FuncSubstringBefore,
        FuncSubstringAfter,
        FuncSubstring,
        FuncStringLength,
        FuncNormalize,
        FuncTranslate,
        FuncLang,
        FuncSum,
        FuncFloor,
        FuncCeiling,
        FuncRound,
        FuncUserDefined
    }
 
    private readonly FunctionType _functionType;
 
    private readonly List<AstNode> _argumentList;
 
    private readonly string _name;
 
    private readonly string _prefix;
 
    internal static XPathResultType[] ReturnTypes = new XPathResultType[28]
    {
        XPathResultType.Number,
        XPathResultType.Number,
        XPathResultType.Number,
        XPathResultType.NodeSet,
        XPathResultType.String,
        XPathResultType.String,
        XPathResultType.String,
        XPathResultType.String,
        XPathResultType.Boolean,
        XPathResultType.Number,
        XPathResultType.Boolean,
        XPathResultType.Boolean,
        XPathResultType.Boolean,
        XPathResultType.String,
        XPathResultType.Boolean,
        XPathResultType.Boolean,
        XPathResultType.String,
        XPathResultType.String,
        XPathResultType.String,
        XPathResultType.Number,
        XPathResultType.String,
        XPathResultType.String,
        XPathResultType.Boolean,
        XPathResultType.Number,
        XPathResultType.Number,
        XPathResultType.Number,
        XPathResultType.Number,
        XPathResultType.Any
    };
 
    public override AstType Type => AstType.Function;
 
    public override XPathResultType ReturnType => ReturnTypes[(int)_functionType];
 
    public FunctionType TypeOfFunction => _functionType;
 
    public List<AstNode> ArgumentList => _argumentList;
 
    public string Prefix => _prefix;
 
    public string Name => _name;
 
    public Function(FunctionType ftype, List<AstNode> argumentList)
    {
        _functionType = ftype;
        _argumentList = new List<AstNode>(argumentList);
    }
 
    public Function(string prefix, string name, List<AstNode> argumentList)
    {
        _functionType = FunctionType.FuncUserDefined;
        _prefix = prefix;
        _name = name;
        _argumentList = new List<AstNode>(argumentList);
    }
 
    public Function(FunctionType ftype, AstNode arg)
    {
        _functionType = ftype;
        _argumentList = new List<AstNode>();
        _argumentList.Add(arg);
    }
}