package ajaxstutter;

/* Jeff Offutt  - June 1989 (C version)           */
/* stutter checks for repeat words in a text file.*/
/* Java version Spring 2008, with help from       */
/* Steven Baker, SWE 437                          */
/**
 * Ravitej Syamala - February 2008
 * Modified for dynamic loading: 
 *  - added isStutter to check stutter is present. 
 */
import java.io.*;
import javax.servlet.http.HttpServletResponse;

public class ajaxstutterClass
{
    /**
     * Returns true if there is a stutter, else false. 
     * @param testPassage 
     * @param response
     * @throws IOException
     */
public static boolean isStutter(String testPassage) throws IOException
{
   int numberOfLines = 1;
   String line = null;
   String lastWord = null;
   String lines[] = testPassage.split("\n");
   for (int n = 0; n < lines.length; n++)
   {
       line = "\n" + lines[n] + "\n";
       // Remove all non alpha-numeric characters
       // This replaces the IsDelimit() function in the C version.
       line = line.replaceAll("[^a-zA-Z0-9 ]", "");
       // A small improvement over the C version - ignore case in the comparison
       line = line.toLowerCase();

       // Splits the line into words and puts in an array of strings
       String[] words = line.split(" ");

       // Compare with the last word on the previous line
       if (words[0].equals(lastWord))
       {
           return true;

       // Stop before the end, nothing to compare the last word with
       }
       for (int i = 0; i < (words.length - 1); i++)
       {
           // Check to see if the current and subsequent words are the same
           if (words[i].equals (words[i + 1]))
           {
               return true;
           }
       }

       // Save last word in the line
       lastWord = words[words.length - 1];
       numberOfLines++;
   }
   return false;
}

    /**
     * This method reads input feild and prints out the stutters into 
     * the response stream using append. Each stutter is delimited by !1 and !2
     * because it ends up being easier to handle (client-side) than more XML. 
     * @param response
     * @throws IOException
     */
public static void checkStutter(String testPassage, HttpServletResponse response) throws IOException
{
   int numberOfLines = 1;
   String line = null;
   String lastWord = null;
   String lines[] = testPassage.split("\n");
   for (int n = 0; n < lines.length; n++)
   {
       line = lines[n];
       // Remove all non alpha-numeric characters
       // This replaces the IsDelimit() function in the C version.
       line = line.replaceAll("[^a-zA-Z0-9 ]", "");
       // A small improvement over the C version - ignore case in the comparison
       line = line.toLowerCase();

       // Splits the line into words and puts in an array of strings
       String[] words = line.split(" ");

       // Compare with the last word on the previous line
       // note that the !1 and !2 are just markers for list tags for display 
       // the substitution for this is done in the javascript for various reasons
       if (words[0].equals (lastWord))
       {
           response.getWriter().append("!1 Repeated word on line " + numberOfLines + ": " + words[0] + "!2 ");

       // Stop before the end, nothing to compare the last word with
       }
       for (int i = 0; i < (words.length - 1); i++)
       {
           // Check to see if the current and subsequent words are the same
           // see above note about !1 and !2. 
           if (words[i].equals (words[i + 1]))
           {
               response.getWriter().append("!1 Repeated word on line " + numberOfLines + ": " + words[i] + "!2 ");
           }
       }

       // Save last word in the line
       lastWord = words[words.length - 1];
       numberOfLines++;
   }
}
}