_Core/Lang/Plugins/Parser/UnitsPlugin.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>	
    // Units plugin allows the usage of units of measure such as length, weight
    
    enable units;

    // inches, bytes are base types. everything is relative to the base types
    // In examples below, the units will get converted to the measurement on the
    // left hand side. e.g. 3 feet + 5 inches will get converted to datatype
    // LUnit with value in feet and basevalue in inches.    
    var result1 = 3 feet + 5 inches + 10 yards + 2 miles
    var result2 = 1 meg + 30 kb + 50 B + 2 gigs

    // Each unit of measure is based on a basevalue with a relative value.
    // e.g. 
    // type             basevalue   relative values
    // length           inches      feet, yard, mile
    // weight           ounces      milligrams, grams, kilograms
    // computerspace    bytes       kilobytes, megabytes, gigabytes
   
    print feet: #{result1.Value} , inches: #{result1.BaseValue}
    print megs: #{result2.Value} , bytes:  #{result2.BaseValue}
     
    </doc:example>
    ***************************************************************************/

    /// <summary>
    /// Plugin to allow using units such as length, weight, etc.
    /// </summary>
    public class UnitsPlugin : ExprPlugin
    {
        private static string[] _tokens = new string[] { "$Suffix" };


        /// <summary>
        /// Initialize
        /// </summary>
        public UnitsPlugin()
        {
            _startTokens = _tokens;
            _hasStatementSupport = true;
        }


        /// <summary>
        /// The grammer for the function declaration
        /// </summary>
        public override string Grammer
        {
            get