tokeniser.cs

用c#写的tf/idf代码

/*
Tokenization
Author: Thanh Ngoc Dao - [e-mail]
Copyright (c) 2005 by Thanh Ngoc Dao.
*/

using System;
using System.Collections;
using System.Text.RegularExpressions;


namespace ServiceRanking
{
	/// <summary>
	/// Summary description for Tokeniser.
	/// Partition string into SUBwords
	/// </summary>
	internal class Tokeniser
	{

		public static string[] ArrayListToArray(ArrayList arraylist)
		{
			string[] array=new string[arraylist.Count] ;
			for(int i=0; i < arraylist.Count ; i++) array[i]=(string) arraylist[i];
			return array;
		}

		public string[] Partition(string input)
		{
			Regex r=new Regex("([ \\t{}():;. \n])");			
			input=input.ToLower() ;

			String [] tokens=r.Split(input); 									

			ArrayList filter=new ArrayList() ;

			for (int i=0; i < tokens.Length ; i++)
			{
				MatchCollection mc=r.Matches(tokens[i]);
				if (mc.Count <= 0 && tokens[i].Trim().Length > 0 					 
					&& !StopWordsHandler.IsStopword (tokens[i]) )								
					filter.Add(tokens[i]) ;
				
				
			}
			
			return ArrayListToArray (filter);
		}


		public Tokeniser()
		{
		}
	}
}