/* 	author:   	Christopher O'Neill
	date:		Feb 2001
   	comments: 	cleaner reads in from a file cleans out none letter or digit chars
   	and loLowerCases it before writing it to a new file*/



import java.io.*;
import java.lang.*;
import java.util.*;


public class Clean
{
/****************************************************************
*Method:		Clean											*
*Returns:		String											*
*Recievs:		String str										*
*Purpose:		remove all non letter or digit characters from 	*
*				word and toLowerCase then return				*
****************************************************************/
private String Cleaner( String word )
	{
	String clean = "";
	for ( int i=0; i < word.length(); i++ )
		{
	    if (Character.isLetterOrDigit(word.charAt(i)))
            {
			clean += word.charAt(i);
			}
     	}
	clean = clean.toLowerCase(); //change all letters in the input to lowercase
   	return clean;
  	} // end of clean method


public static void main(String args[] )
	{
	Clean c= new Clean();
	String text;
	StringTokenizer line = new StringTokenizer("");
	String filein = args[0];
	String fileout = args[1];
	String snewline = args[2];
	boolean newline = false;
	if (snewline.equals("/n"));
		{
		newline = true;
		}
	try
		{
		FileWriter fw = new FileWriter(fileout);
		BufferedWriter bw = new BufferedWriter(fw);
		FileReader fr = new FileReader(filein);
		BufferedReader br = new BufferedReader(fr);
		try
			{
			while ((text=br.readLine())!= null)
				{
				line= new StringTokenizer(text);
				try
					{
					while (line.hasMoreTokens())
						{
						// read word from line and stem word
						String word = new String();
						word = line.nextToken();
						if (newline)
							{
							bw.write(c.Cleaner(word));
							bw.newLine();
							}
						else
							{
							bw.write(c.Cleaner(word)+" ");
							}
						}
					if (!newline)
						{
						bw.newLine();
						}
					}
				catch (Exception e)
					{
					System.err.println(e);
					}
				}
			}
		catch(Exception e)
			{
			System.err.println("File Error Durring Reading"+e);
			System.exit(0);
			}
			// try to close file, file is not needed again so if can't close don't exit
		try
			{
			fr.close();
			}
		catch(Exception e)
			{
			System.err.println("Error Closing File During Reading");
			}
		try
			{
			bw.close();
			}
		catch(Exception e)
			{
			System.err.println(e);
			}
		}
	catch(Exception e)
		{
		System.err.println("Input File" + filein +"not found");
		System.exit(1);
		}


	}//main

} //class