using System;
using System.Collections.Generic;
using System.Threading;

namespace CPF.ReoGrid.Formula
{
	public class FormulaExtension
	{
		static FormulaExtension()
		{
			try
			{
				FormulaExtension.ParameterSeparator = Thread.CurrentThread.CurrentCulture.TextInfo.ListSeparator;
				FormulaExtension.NumberDecimalSeparator = Thread.CurrentThread.CurrentCulture.NumberFormat.NumberDecimalSeparator;
			}
			catch
			{
			}
		}

		public static Dictionary<string, Func<Cell, object[], object>> CustomFunctions
		{
			get
			{
				bool flag = FormulaExtension.customFunctions == null;
				if (flag)
				{
					FormulaExtension.customFunctions = new Dictionary<string, Func<Cell, object[], object>>();
				}
				return FormulaExtension.customFunctions;
			}
		}

		public static Func<Cell, string, object> NameReferenceProvider { get; set; }

		public static Func<Worksheet, CellPosition, Cell, object> EmptyCellReferenceProvider { get; set; }

		public static void ChangeToStandardFunctionNames()
		{
			bool flag = FormulaExtension.standardFunctionNameProvider == null;
			if (flag)
			{
				FormulaExtension.standardFunctionNameProvider = new StandardFunctionNameProvider();
			}
			Evaluator.functionNameProvider = FormulaExtension.standardFunctionNameProvider;
		}

		public static void ChangeToRussianFunctionNames()
		{
			bool flag = FormulaExtension.russianFunctionNameProvider == null;
			if (flag)
			{
				FormulaExtension.russianFunctionNameProvider = new RussianFunctionNameProvider();
			}
			Evaluator.functionNameProvider = FormulaExtension.russianFunctionNameProvider;
		}

		public static string ParameterSeparator = ",";

		public static string NumberDecimalSeparator = ".";

		internal static Dictionary<string, Func<Cell, object[], object>> customFunctions;

		private static StandardFunctionNameProvider standardFunctionNameProvider = null;

		private static RussianFunctionNameProvider russianFunctionNameProvider = null;
	}
}