_Core/Lang/Plugins/Parser/TimePlugin.cs

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


namespace ComLib.Lang.Extensions
{

    /* *************************************************************************
    <doc:example>	
    // Time plugin provides a convenient way to represent time in fluent syntax.
    
    var t = 12:30 pm;
    
    if t is 12:30 pm then
	    print it's time to go to lunch!
    </doc:example>
    ***************************************************************************/

    /// <summary>
    /// Combinator for handling dates. noon afternoon. evening, nite midnight
    /// </summary>
    public class TimePlugin : ExprPlugin
    {
        private static string[] _tokens = new string[] { "$NumberToken", "Noon", "noon", "midnight", "Midnight" };
        private static Dictionary<string, TimeSpan> _aliases;

        /// <summary>
        /// Initialize
        /// </summary>
        static TimePlugin()
        {
            _aliases = new Dictionary<string, TimeSpan>();
            _aliases["noon"] = new TimeSpan(12, 0, 0);
            _aliases["Noon"] = new TimeSpan(12, 0, 0);
            _aliases["midnight"] = new TimeSpan(0, 0, 0);
            _aliases["Midnight"] = new TimeSpan(0, 0, 0);
        }


        /// <summary>
        /// Initialize
        /// </summary>
        public TimePlugin()
        {
            _startTokens = _tokens;
        }


        /// <summary>
        /// The grammer for the function declaration
        /// </summary>
        public override string Grammer
        {
            get
            {
                return "( ( noon | Noon | midnight | Midnight ) | ( <number> ( ':' <number> ){1,2} ( am | pm ) ) ";
            }