package org.apache.regexp;
/*
* ====================================================================
*
* The Apache Software License, Version 1.1
*
* Copyright (c) 1999 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution, if
* any, must include the following acknowlegement:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowlegement may appear in the software itself,
* if and wherever such third-party acknowlegements normally appear.
*
* 4. The names "The Jakarta Project", "Jakarta-Regexp", and "Apache Software
* Foundation" must not be used to endorse or promote products derived
* from this software without prior written permission. For written
* permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache"
* nor may "Apache" appear in their names without prior written
* permission of the Apache Group.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*
*/
import java.applet.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import javax.swing.*;
/**
* Interactive demonstration and testing harness for regular expressions classes.
* @author <a href="mailto:jonl@muppetlabs.com">Jonathan Locke</a>
* @version $Id: REDemo.java,v 1.1 2004/04/10 00:17:47 guehene Exp $
*/
public class REDemo extends Applet implements TextListener
{
/**
* Matcher and compiler objects
*/
RE r = new RE();
REDebugCompiler compiler = new REDebugCompiler();
/**
* Components
*/
TextField fieldRE; // Field for entering regexps
TextField fieldMatch; // Field for entering match strings
TextArea outRE; // Output of RE compiler
TextArea outMatch; // Results of matching operation
/**
* Add controls and init applet
*/
public void init()
{
// Add components using the dreaded GridBagLayout
GridBagLayout gb = new GridBagLayout();
setLayout(gb);
GridBagConstraints c = new GridBagConstraints();
c.insets = new Insets(5, 5, 5, 5);
c.anchor = c.EAST;
gb.setConstraints(add(new Label("Regular expression:", Label.RIGHT)), c);
c.gridy = 0;
c.anchor = c.WEST;
gb.setConstraints(add(fieldRE = new TextField("\\[([:javastart:][:javapart:]*)\\]", 40)), c);
c.gridx = 0;
c.gridy = c.RELATIVE;
c.anchor = c.EAST;
gb.setConstraints(add(new Label("String:", Label.RIGHT)), c);
c.gridy = 1;
c.gridx = c.RELATIVE;
c.anchor = c.WEST;
gb.setConstraints(add(fieldMatch = new TextField("aaa([foo])aaa", 40)), c);
c.gridy = 2;
c.gridx = c.RELATIVE;
c.fill = c.BOTH;
c.weighty = 1.0;
c.weightx = 1.0;
gb.setConstraints(add(outRE = new TextArea()), c);
c.gridy = 2;
c.gridx = c.RELATIVE;
gb.setConstraints(add(outMatch = new TextArea()), c);
// Listen to text changes
fieldRE.addTextListener(this);
fieldMatch.addTextListener(this);
// Initial UI update
textValueChanged(null);
}
/**
* Say something into RE text area
* @param s What to say
*/
void sayRE(String s)
{
outRE.setText(s);
}
/**
* Say something into match text area
* @param s What to say
*/
void sayMatch(String s)
{
outMatch.setText(s);
}
/**
* Convert throwable to string
* @param t Throwable to convert to string
*/
String throwableToString(Throwable t)
{
String s = t.getClass().getName();
String m;
if ((m = t.getMessage()) != null)
{
s += "\n" + m;
}
return s;
}
/**
* Change regular expression
* @param expr Expression to compile
*/
void updateRE(String expr)
{
try
{
// Compile program
r.setProgram(compiler.compile(expr));
// Dump program into RE feedback area
CharArrayWriter w = new CharArrayWriter();
compiler.dumpProgram(new PrintWriter(w));
sayRE(w.toString());
System.out.println(w);
}
catch (Exception e)
{
r.setProgram(null);
sayRE(throwableToString(e));
}
catch (Throwable t)
{
r.setProgram(null);
sayRE(throwableToString(t));
}
}
/**
* Update matching info by matching the string against the current
* compiled regular expression.
* @param match String to match against
*/
void updateMatch(String match)
{
try
{
// If the string matches the regexp
if (r.match(match))
{
// Say that it matches
String out = "Matches.\n\n";
// Show contents of parenthesized subexpressions
for (int i = 0; i < r.getParenCount(); i++)
{
out += "$" + i + " = " + r.getParen(i) + "\n";
}
sayMatch(out);
}
else
{
// Didn't match!
sayMatch("Does not match");
}
}
catch (Throwable t)
{
sayMatch(throwableToString(t));
}
}
/**
* Called when text values change
* @param e TextEvent
*/
public void textValueChanged(TextEvent e)
{
// If it's a generic update or the regexp changed...
if (e == null || e.getSource() == fieldRE)
{
// Update regexp
updateRE(fieldRE.getText());
}
// We always need to update the match results
updateMatch(fieldMatch.getText());
}
/**
* Main application entrypoint.
* @param arg Command line arguments
*/
static public void main(String[] arg)
{
JFrame f = new JFrame("RE Demo");
// f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.addWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent e)
{
System.exit(0);
}
});
Container c = f.getContentPane();
c.setLayout(new FlowLayout());
REDemo demo = new REDemo();
c.add(demo);
demo.init();
f.pack();
f.setVisible(true);
}
}