_Core/Lang/Plugins/Parser/LinqPlugin.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>	
    // Linq plugin is a Light-weight and partial version of Linq style queries and comprehensions
    // NOTE: This has limited functionality as of this release.
    var books = [ 
				    { name: 'book 1', pages: 200, author: 'homey' },
				    { name: 'book 2', pages: 120, author: 'kdog' },
				    { name: 'book 3', pages: 140, author: 'homeslice' }
			    ];
     
    // Case 1: start with source <books> and system auto creates variable <book>
    var favorites = books where book.pages < 150 and book.author == 'kdog';
    
    // Case 2: using from <variable> in <source>
    var favorities = from book in books where book.pages < 150 and book.author == 'kdog';
    </doc:example>
    ***************************************************************************/

    /// <summary>
    /// Combinator for handling comparisons.
    /// </summary>
    public class LinqPlugin : ExprPlugin
    {
        private static string[] _tokens = new string[] { "$IdToken", "select", "from", "where" };
        private static IDictionary<Token, bool> _terminators;


        private string _variableName;
        private Expr _source;
        private Expr _filter;


        static LinqPlugin()
        {
            _terminators = new Dictionary<Token, bool>();
            _terminators[new IdToken("order")] = true;
            _terminators[Tokens.Semicolon] = true;
            _terminators[Tokens.NewLine] = true;
            _terminators[Tokens.Comma] = true;
            _terminators[Tokens.RightParenthesis] = true;
        }


        /// <summary>
        /// Initialize
        /// </summary>
        public LinqPlugin()
        {
            _startTokens = _tokens;
            _precedence = 1;