package com.darwinsys.regex;
import java.awt.Color;
import java.awt.Component;
import java.awt.Font;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.util.regex.PatternSyntaxException;
import javax.swing.ButtonGroup;
import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
import javax.swing.event.DocumentEvent;
import javax.swing.event.DocumentListener;
import javax.swing.text.BadLocationException;
import javax.swing.text.DefaultHighlighter;
import javax.swing.text.Highlighter;
import com.darwinsys.swingui.FontChooser;
import com.darwinsys.swingui.UtilGUI;
/** Standalone Swing GUI application for demonstrating REs.
* @author Ian Darwin, http://www.darwinsys.com/
*/
public class REDemo extends JPanel {
private static final long serialVersionUID = 3257563988576317490L;
protected Pattern pattern;
protected Matcher matcher;
protected JLabel pattLabel, stringLabel;
protected JTextField patternTF, stringTF;
protected JCheckBox compiledOK;
protected JRadioButton match, findButton, findAll;
protected JTextField matchesTF;
protected JTextArea logTextArea;
/** UI components to update when the font changes */
protected Component[] fontChangers;
private static final Color[] Colors = {
Color.RED, Color.GREEN, Color.BLUE, Color.CYAN, Color.LIGHT_GRAY,
Color.MAGENTA, Color.ORANGE, Color.PINK, Color.WHITE
};
/** "tag" used in highlighting */
Object onlyHighlight;
Highlighter highlighter;
/** "main program" method - construct and show
* @throws BadLocationException */
public static void main(String[] av) throws BadLocationException {
JFrame f = new JFrame("REDemo");
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
REDemo comp = new REDemo(f);
f.setContentPane(comp);
f.pack();
f.setLocation(200, 200);
f.setVisible(true);
}
/** Construct the REDemo object including its GUI
* @throws BadLocationException */
public REDemo(final JFrame parent) throws BadLocationException {
super();
JMenuBar bar = new JMenuBar();
JMenu file = new JMenu("File");
bar.add(file);
JMenuItem quitItem = new JMenuItem("Exit");
file.add(quitItem);
quitItem.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
System.exit(0);
}
});
JMenu options = new JMenu("Options");
bar.add(options);
JMenuItem fontItem = new JMenuItem("Font");
options.add(fontItem);
final FontChooser fontChooser = new FontChooser(parent);
fontItem.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
fontChooser.setVisible(true);
Font font = fontChooser.getSelectedFont();
if (font == null) {
System.out.println("Nothing selected");
return;
}
System.out.println(font);
for (Component c : fontChangers) {
if (c != null) {
c.setFont(font);
}
}
parent.pack();
}
});
parent.setJMenuBar(bar);
JPanel top = new JPanel();
pattLabel = new JLabel("Pattern:", JLabel.RIGHT);
top.add(pattLabel);
patternTF = new JTextField(40);
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 buttonGroup = new ButtonGroup();
match = new JRadioButton("Match");
match.setSelected(true);
match.addChangeListener(cl);
buttonGroup.add(match);
switchPane.add(match);
findButton = new JRadioButton("Find");
findButton.addChangeListener(cl);
buttonGroup.add(findButton);
switchPane.add(findButton);
findAll = new JRadioButton("Find All");
findAll.addChangeListener(cl);
buttonGroup.add(findAll);
switchPane.add(findAll);
buttonGroup.setSelected(findButton.getModel(), true);
JPanel strPane = new JPanel();
stringLabel = new JLabel("String:", JLabel.RIGHT);
strPane.add(stringLabel);
stringTF = new JTextField(40);
stringTF.getDocument().addDocumentListener(new StringListener());
highlighter = stringTF.getHighlighter();
onlyHighlight = highlighter.addHighlight(0, 0, DefaultHighlighter.DefaultPainter);
strPane.add(stringTF);
strPane.add(new JLabel("Matches:"));
matchesTF = new JTextField(3);
strPane.add(matchesTF);
JPanel bottomPanel = new JPanel();
final JButton copyButton = new JButton("Copy Pattern");
bottomPanel.add(copyButton);
copyButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
UtilGUI.setSystemClipboardContents(REDemo.this, patternTF.getText());
}
});
final JButton copyDoubledButton = new JButton("Copy Pattern Backslashed");
bottomPanel.add(copyDoubledButton);
copyDoubledButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
UtilGUI.setSystemClipboardContents(REDemo.this, patternTF.getText().replaceAll("\\\\", "\\\\\\\\"));
}
});
final JButton quitButton = new JButton("Exit");
bottomPanel.add(quitButton);
quitButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
System.exit(0);
}
});
setLayout(new GridLayout(0, 1, 5, 5));
add(top);
add(strPane);
add(switchPane);
add(logTextArea = new JTextArea(5,40));
add(bottomPanel);
// Now that the components are created, add them to the list
// that change fonts.
fontChangers = new Component[]{
pattLabel, patternTF, stringLabel, stringTF,
match, findButton, findAll,
matchesTF, logTextArea
};
}
boolean matches;
protected void setMatches(boolean b) {
matches = b;
if (b) {
matchesTF.setText("Yes");
} else {
matchesTF.setText("No");
}
}
boolean isMatch() {
return matches;
}
protected void setMatches(int n) {
matchesTF.setText(Integer.toString(n));
}
protected void tryAll() {
tryCompile();
String data = stringTF.getText();
if (data != null && data.length() > 0) {
tryMatch();
}
}
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;
}
logTextArea.setText("");
setMatches(false);
setHighlightFromMatcher(null);
matcher.reset(stringTF.getText());
if (match.isSelected() && matcher.matches()) {
setMatches(true);
setHighlightFromMatcher(matcher);
logTextArea.setText("");
for (int i = 0; i <= matcher.groupCount(); i++) {
logTextArea.append(i + " " + matcher.group(i) + "\n");
}
} else if (findButton.isSelected() && matcher.find()) {
setMatches(true);
setHighlightFromMatcher(matcher);
logTextArea.setText(matcher.group());
} else if (findAll.isSelected()) {
int i = 0;
while (matcher.find()) {
logTextArea.append(i++ + ": " + matcher.group() + "\n");
}
if (i > 0) {
setMatches(true);
return true;
}
}
return isMatch();
}
private void setHighlightFromMatcher(Matcher matcher) {
int start, end;
if (matcher == null) {
start = end = 0;
} else {
start = matcher.start();
end = matcher.end();
}
try {
// System.out.printf("setHighlightFromMatcher(): %d...%d%n", start, end);
highlighter.changeHighlight(onlyHighlight, start, end);
} catch (BadLocationException e) {
System.err.println(e);
}
}
/** Any change to the pattern tries to compile the result. */
class PatternListener implements DocumentListener {
public void changedUpdate(DocumentEvent ev) {
tryAll();
}
public void insertUpdate(DocumentEvent ev) {
tryAll();
}
public void removeUpdate(DocumentEvent ev) {
tryAll();
}
}
/** 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();
}
}
public Color getColor(int n) {
return Colors[n%Colors.length];
}
}