﻿//
//    Copyright (c) 2006-2018 Erik Ylvisaker
//
//    Permission is hereby granted, free of charge, to any person obtaining a copy
//    of this software and associated documentation files (the "Software"), to deal
//    in the Software without restriction, including without limitation the rights
//    to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
//    copies of the Software, and to permit persons to whom the Software is
//    furnished to do so, subject to the following conditions:
//
//    The above copyright notice and this permission notice shall be included in all
//    copies or substantial portions of the Software.
//
//    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
//    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
//    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
//    AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
//    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
//    OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
//    SOFTWARE.
//

using System.Linq;
using System.Text.RegularExpressions;

namespace AgateLib.Diagnostics.CommandLibraries
{
    /// <summary>
    /// Static class which separates a command into its tokens. 
    /// </summary>
    public static class ConsoleTokenizer
    {
        public static string[] Tokenize(string command)
        {
            // regular expression obtained from 
            // http://stackoverflow.com/questions/554013/regular-expression-to-split-on-spaces-unless-in-quotes
            //
            var regexMatches = Regex.Matches(command,
                @"((""((?<token>.*?)(?<!\\)"")|(?<token>[^ ]+))(\s)*)");

            string[] tokens = (from Match m in regexMatches
                               where m.Groups["token"].Success
                               select m.Groups["token"].Value).ToArray();

            return tokens;
        }
    }
}