// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
 
namespace MS.Internal.Xml.XPath
{
    using System;
    using Microsoft.Xml;
    using Microsoft.Xml.XPath;
    using System.Diagnostics;
    using System.Collections;
 
    internal 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 FunctionType _functionType;
        private ArrayList _argumentList;
 
        private string _name = null;
        private string _prefix = null;
 
        public Function(FunctionType ftype, ArrayList argumentList)
        {
            _functionType = ftype;
            _argumentList = new ArrayList(argumentList);
        }
 
        public Function(string prefix, string name, ArrayList argumentList)
        {
            _functionType = FunctionType.FuncUserDefined;
            _prefix = prefix;
            _name = name;
            _argumentList = new ArrayList(argumentList);
        }
 
        public Function(FunctionType ftype)
        {
            _functionType = ftype;
        }
 
        public Function(FunctionType ftype, AstNode arg)
        {
            _functionType = ftype;
            _argumentList = new ArrayList();
            _argumentList.Add(arg);
        }
 
        public override AstType Type { get { return AstType.Function; } }
 
        public override XPathResultType ReturnType
        {
            get
            {
                return ReturnTypes[(int)_functionType];
            }
        }
 
        public FunctionType TypeOfFunction { get { return _functionType; } }
        public ArrayList ArgumentList { get { return _argumentList; } }
        public string Prefix { get { return _prefix; } }
        public string Name { get { return _name; } }
 
        internal static XPathResultType[] ReturnTypes = {
            /* FunctionType.FuncLast            */ XPathResultType.Number ,
            /* FunctionType.FuncPosition        */ XPathResultType.Number ,
            /* FunctionType.FuncCount           */ XPathResultType.Number ,
            /* FunctionType.FuncID              */ XPathResultType.NodeSet,
            /* FunctionType.FuncLocalName       */ XPathResultType.String ,
            /* FunctionType.FuncNameSpaceUri    */ XPathResultType.String ,
            /* FunctionType.FuncName            */ XPathResultType.String ,
            /* FunctionType.FuncString          */ XPathResultType.String ,
            /* FunctionType.FuncBoolean         */ XPathResultType.Boolean,
            /* FunctionType.FuncNumber          */ XPathResultType.Number ,
            /* FunctionType.FuncTrue            */ XPathResultType.Boolean,
            /* FunctionType.FuncFalse           */ XPathResultType.Boolean,
            /* FunctionType.FuncNot             */ XPathResultType.Boolean,
            /* FunctionType.FuncConcat          */ XPathResultType.String ,
            /* FunctionType.FuncStartsWith      */ XPathResultType.Boolean,
            /* FunctionType.FuncContains        */ XPathResultType.Boolean,
            /* FunctionType.FuncSubstringBefore */ XPathResultType.String ,
            /* FunctionType.FuncSubstringAfter  */ XPathResultType.String ,
            /* FunctionType.FuncSubstring       */ XPathResultType.String ,
            /* FunctionType.FuncStringLength    */ XPathResultType.Number ,
            /* FunctionType.FuncNormalize       */ XPathResultType.String ,
            /* FunctionType.FuncTranslate       */ XPathResultType.String ,
            /* FunctionType.FuncLang            */ XPathResultType.Boolean,
            /* FunctionType.FuncSum             */ XPathResultType.Number ,
            /* FunctionType.FuncFloor           */ XPathResultType.Number ,
            /* FunctionType.FuncCeiling         */ XPathResultType.Number ,
            /* FunctionType.FuncRound           */ XPathResultType.Number ,
            /* FunctionType.FuncUserDefined     */ XPathResultType.Any
        };
    }
}