//Copyright (C) 2006 Richard J. Northedge
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

//This file is based on the Util.java source file found in
//the Java WordNet Library (JWNL).  That source file is licensed under BSD.

using System;
using System.Collections;
using System.Collections.Generic;
using System.Text;

namespace BotSharp.MachineLearning.Morph
{
    public class Util
    {
        public static string GetLemma(string[] tokens, BitArray bits, string delimiter)
        {
            StringBuilder buf = new StringBuilder();
            for (int i = 0; i < tokens.Length; i++)
            {
                if (i != 0 && !bits.Get(i - 1))
                {
                    buf.Append(delimiter);
                }
                buf.Append(tokens[i]);
            }
            return buf.ToString();
        }

        public static bool Increment(BitArray bits, int size)
        {
            int i = size - 1;
            while (i >= 0 && bits.Get(i))
            {
                bits.Set(i--, false);
            }
            if (i < 0)
            {
                return false;
            }
            bits.Set(i, true);
            return true;
        }

        public static string[] Split(string str)
        {
            char[] chars = str.ToCharArray();
            List<string> tokens = new List<string>();
            StringBuilder buf = new StringBuilder();
            for (int i = 0; i < chars.Length; i++)
            {
                if ((chars[i] >= 'a' && chars[i] <= 'z') || chars[i] == '\'')
                {
                    buf.Append(chars[i]);
                }
                else
                {
                    if (buf.Length > 0)
                    {
                        tokens.Add(buf.ToString());
                        buf = new StringBuilder();
                    }
                }
            }
            if (buf.Length > 0)
            {
                tokens.Add(buf.ToString());
            }
            return (tokens.ToArray());
        }

        private Util()
        {
        }
    }
}