/*
Palindrome Program by Mrs. Hodara, Seabury Hall School	
*/
import java.io.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.*;
import java.applet.*;

public class Palindrome extends Applet implements ActionListener
{
	public void init()
	{
		setLayout(new BorderLayout());
		setBackground(Color.cyan);
		setForeground(Color.red);
		Panel linePanel = new Panel();
		Label lineLabel = 
		new Label ("Enter phrase to check, please.");
		linePanel.add(lineLabel);
		lineField = new TextField(50);
		linePanel.add(lineField);
		add(linePanel, "North");
		
		Panel resultPanel = new Panel();
		Label resultLabel = new Label("Is it a palindrome?");
		resultPanel.add(resultLabel);
		resultField = new TextField(6);
		resultPanel.add(resultField);
		add(resultPanel, "Center");
		
		Panel buttonPanel = new Panel();
		buttonPanel.setLayout(new FlowLayout());
		Button b = new Button("Test");
		b.addActionListener(this);
		buttonPanel.add(b);
		b = new Button ("Clear");
		b.addActionListener(this);
		buttonPanel.add(b);
		add(buttonPanel, "South");		

	}
	

public void  actionPerformed(ActionEvent e)
{
	if (e.getActionCommand().equals("Test"))
		testLine();
	else if ( e.getActionCommand().equals("Clear"))
	{
		lineField.setText("");
		resultField.setText("");
	}
		
	repaint();
}
public static String StripPunc(String phrase)
{
	int index =0;
	String newPhrase="";
	phrase = phrase.toLowerCase();
	for (index=0;index<phrase.length();index++)
		if (phrase.charAt(index)>=97 && phrase.charAt(index)<=122)
			{
				newPhrase = newPhrase + phrase.charAt(index);
			}
return(newPhrase);
}
private void testLine()
{	nLine="";
	line = lineField.getText();
	int lineLength = line.length();
	nLine=nLine +(StripPunc(line));
	if (nLine.length()>0)
	{
	if (palindrome (nLine))
			resultField.setText("True");
	else
		resultField.setText("False");
	}
}
public static boolean palindrome (String myPal)
{
	int inL=-1, inR=myPal.length()-1;
	do
		{
			inL++;
		}while((inL<=myPal.length()/2-1)&&(myPal.charAt(inL)==myPal.charAt(inR-inL)));
	if (inL>myPal.length()/2-1)
		return true;
	return false;
}
private String nLine="";
private TextField lineField;
private String line = "";
private TextField resultField;
private String result = "";
}