Mega Code Archive
Standalone Swing GUI application for demonstrating Regular expressions
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/*
* Copyright (c) Ian F. Darwin, http://www.darwinsys.com/, 1996-2002.
* All rights reserved. Software written by Ian F. Darwin and others.
* $Id: LICENSE,v 1.8 2004/02/09 03:33:38 ian Exp $
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS 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 AUTHOR OR 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 USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND 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.
*
* Java, the Duke mascot, and all variants of Sun's Java "steaming coffee
* cup" logo are trademarks of Sun Microsystems. Sun's, and James Gosling's,
* pioneering role in inventing and promulgating (and standardizing) the Java
* language and environment is gratefully acknowledged.
*
* The pioneering role of Dennis Ritchie and Bjarne Stroustrup, of AT&T, for
* inventing predecessor languages C and C++ is also gratefully acknowledged.
*/
import java.awt.GridLayout;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.util.regex.PatternSyntaxException;
import javax.swing.ButtonGroup;
import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
import javax.swing.JTextField;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
import javax.swing.event.DocumentEvent;
import javax.swing.event.DocumentListener;
/**
* Standalone Swing GUI application for demonstrating REs. <br/>TODO: Show the
* entire match, and $1 and up as captures that matched.
*
* @author Ian Darwin, http://www.darwinsys.com/
* @version #Id$
*/
public class REDemo extends JPanel {
protected Pattern pattern;
protected Matcher matcher;
protected JTextField patternTF, stringTF;
protected JCheckBox compiledOK;
protected JRadioButton match, find, findAll;
protected JTextField matchesTF;
/** "main program" method - construct and show */
public static void main(String[] av) {
JFrame f = new JFrame("REDemo");
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
REDemo comp = new REDemo();
f.setContentPane(comp);
f.pack();
f.setLocation(200, 200);
f.setVisible(true);
}
/** Construct the REDemo object including its GUI */
public REDemo() {
super();
JPanel top = new JPanel();
top.add(new JLabel("Pattern:", JLabel.RIGHT));
patternTF = new JTextField(20);
patternTF.getDocument().addDocumentListener(new PatternListener());
top.add(patternTF);
top.add(new JLabel("Syntax OK?"));
compiledOK = new JCheckBox();
top.add(compiledOK);
ChangeListener cl = new ChangeListener() {
public void stateChanged(ChangeEvent ce) {
tryMatch();
}
};
JPanel switchPane = new JPanel();
ButtonGroup bg = new ButtonGroup();
match = new JRadioButton("Match");
match.setSelected(true);
match.addChangeListener(cl);
bg.add(match);
switchPane.add(match);
find = new JRadioButton("Find");
find.addChangeListener(cl);
bg.add(find);
switchPane.add(find);
findAll = new JRadioButton("Find All");
findAll.addChangeListener(cl);
bg.add(findAll);
switchPane.add(findAll);
JPanel strPane = new JPanel();
strPane.add(new JLabel("String:", JLabel.RIGHT));
stringTF = new JTextField(20);
stringTF.getDocument().addDocumentListener(new StringListener());
strPane.add(stringTF);
strPane.add(new JLabel("Matches:"));
matchesTF = new JTextField(3);
strPane.add(matchesTF);
setLayout(new GridLayout(0, 1, 5, 5));
add(top);
add(strPane);
add(switchPane);
}
protected void setMatches(boolean b) {
if (b)
matchesTF.setText("Yes");
else
matchesTF.setText("No");
}
protected void setMatches(int n) {
matchesTF.setText(Integer.toString(n));
}
protected void tryCompile() {
pattern = null;
try {
pattern = Pattern.compile(patternTF.getText());
matcher = pattern.matcher("");
compiledOK.setSelected(true);
} catch (PatternSyntaxException ex) {
compiledOK.setSelected(false);
}
}
protected boolean tryMatch() {
if (pattern == null)
return false;
matcher.reset(stringTF.getText());
if (match.isSelected() && matcher.matches()) {
setMatches(true);
return true;
}
if (find.isSelected() && matcher.find()) {
setMatches(true);
return true;
}
if (findAll.isSelected()) {
int i = 0;
while (matcher.find()) {
++i;
}
if (i > 0) {
setMatches(i);
return true;
}
}
setMatches(false);
return false;
}
/** Any change to the pattern tries to compile the result. */
class PatternListener implements DocumentListener {
public void changedUpdate(DocumentEvent ev) {
tryCompile();
}
public void insertUpdate(DocumentEvent ev) {
tryCompile();
}
public void removeUpdate(DocumentEvent ev) {
tryCompile();
}
}
/** Any change to the input string tries to match the result */
class StringListener implements DocumentListener {
public void changedUpdate(DocumentEvent ev) {
tryMatch();
}
public void insertUpdate(DocumentEvent ev) {
tryMatch();
}
public void removeUpdate(DocumentEvent ev) {
tryMatch();
}
}
}
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