_Core/Lang/Integration/ExternalFunctions.cs

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using ComLib.Lang.Helpers;


namespace ComLib.Lang
{
    /// <summary>
    /// Helper class for calling functions
    /// </summary>
    public class ExternalFunctions : IFunctionLookup
    {
        private Dictionary<string, Func<FunctionCallExpr, object>> _customCallbacks;
        private Dictionary<string, string> _lcaseToFormaNameMap;


        /// <summary>
        /// Initialize
        /// </summary>
        public ExternalFunctions()
        {
            _customCallbacks = new Dictionary<string, Func<FunctionCallExpr, object>>();
            _lcaseToFormaNameMap = new Dictionary<string, string>();
        }


        /// <summary>
        /// Registers a custom function callback.
        /// </summary>
        /// <param name="pattern"></param>
        /// <param name="callback">The custom callback</param>
        public void Register(string pattern, Func<FunctionCallExpr, object> callback)
        {
            _customCallbacks[pattern] = callback;
            _lcaseToFormaNameMap[pattern.ToLower()] = pattern;
        }

        
        /// <summary>
        /// Whether or not the function call supplied is a custom function callback that is 
        /// outside of the script.
        /// </summary>
        /// <param name="name">Name of the function</param>
        /// <returns></returns>
        public bool Contains(string name)
        {
            var callback = GetByName(name);
            return callback != null;
        }


        /// <summary>
        /// Get the formal case sensitive function name that matches the case insensitive function name supplied.
        /// </summary>
        /// <param name="name">Name of the function</param>
        /// <returns></returns>
        public string GetMatch(string name)
        {