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Groovy example source code file (RegexCoach.groovy)

This example Groovy source code file (RegexCoach.groovy) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Groovy tags/keywords

awt, borderlayout, borderlayout, coach, event, groovy, gui, keyadapter, no, patternsyntaxexception, regex, regex, regexhighlighter, regexhighlighter, regular, regular, swing, target, text, the

The Groovy RegexCoach.groovy source code

// Groovy Regex Coach - Copyright 2007 Jeremy Rayner
// inspired by http://weitz.de/regex-coach/

import java.awt.*
import java.awt.event.*
import java.util.regex.*
import javax.swing.*
import javax.swing.text.DefaultHighlighter
import groovy.swing.SwingBuilder

// define the view
def swing = new SwingBuilder()
def gui = swing.frame(title: 'The Groovy Regex Coach', location: [20, 40], size: [600, 500], defaultCloseOperation: WindowConstants.EXIT_ON_CLOSE) {
    panel(layout: new BorderLayout()) {
        splitPane(orientation: JSplitPane.VERTICAL_SPLIT, dividerLocation: 150) {
            panel(layout: new BorderLayout()) {
                label(constraints: BorderLayout.NORTH, text: 'Regular expression:')
                scrollPane(constraints: BorderLayout.CENTER) {textPane(id: 'regexPane')}
                label(constraints: BorderLayout.SOUTH, id: 'regexStatus', text: ' ')
            }
            panel(layout: new BorderLayout()) {
                label(constraints: BorderLayout.NORTH, text: 'Target string:')
                scrollPane(constraints: BorderLayout.CENTER) {textPane(id: 'targetPane')}
                panel(constraints: BorderLayout.SOUTH, layout: new BorderLayout()) {
                    label(constraints: BorderLayout.NORTH, id: 'targetStatus', text: ' ')
                    panel(constraints: BorderLayout.SOUTH, layout: new FlowLayout()) {
                        button('<<-', id: 'scanLeft')
                        button('->>', id: 'scanRight')
                    }
                }
            }
        }
    }
}
def highlighter = new RegexHighlighter(swing: swing)
swing.regexPane.addKeyListener(highlighter)
swing.targetPane.addKeyListener(highlighter)
swing.scanLeft.addActionListener(highlighter)
swing.scanRight.addActionListener(highlighter)
gui.show()

class RegexHighlighter extends KeyAdapter implements ActionListener {
    def swing // reference to the view
    int scanIndex // how many times to execute matcher.find()
    def orange = new DefaultHighlighter.DefaultHighlightPainter(Color.ORANGE)
    def yellow = new DefaultHighlighter.DefaultHighlightPainter(Color.YELLOW)
    def red = new DefaultHighlighter.DefaultHighlightPainter(Color.RED)

    // react to user actions

    public void actionPerformed(ActionEvent event) {
        if (event.actionCommand == '<<-') {scanIndex = Math.max(scanIndex - 1, 0)}
        if (event.actionCommand == '->>') {scanIndex++}
        doHighlights()
    }

    public void keyReleased(KeyEvent event) {
        scanIndex = 0
        doHighlights()
    }

    private resetView() {
        swing.regexPane.highlighter.removeAllHighlights()
        swing.targetPane.highlighter.removeAllHighlights()
        swing.regexStatus.text = ' '
        swing.targetStatus.text = ' '
    }

    // the main regex logic

    private doHighlights() {
        try {
            resetView()
            // note: get the text from the underlying document,
            // otherwise carriage return/line feeds different when using the JTextPane text
            def regex = swing.regexPane.document.getText(0, swing.regexPane.document.length)
            def target = swing.targetPane.document.getText(0, swing.targetPane.document.length)

            def matcher = (target =~ regex)

            // scan past the matches before the match we want
            int scan = 0
            while (scan < scanIndex) {
                matcher.find()
                scan++
            }
            if (matcher.find()) {
                // highlight any captured groups
                int i = 0
                while (i++ < matcher.groupCount()) {
                    swing.targetPane.highlighter.addHighlight(matcher.start(i), matcher.end(i), orange)
                }
                // highlight whole match
                swing.targetPane.highlighter.addHighlight(matcher.start(), matcher.end(), yellow)
                if (regex.length() != 0) {
                    swing.targetStatus.text = "Match #${scanIndex + 1} from ${matcher.start()} to ${matcher.end()}."
                }
            } else { // not found
                scanIndex = Math.max(scan - 1, 0)
                if (scanIndex > 0) {doHighlights()}
                swing.targetStatus.text = "No match."
            }
        } catch (PatternSyntaxException e) {
            swing.regexPane.highlighter.addHighlight(e.index, e.index + 2, red)
            swing.regexStatus.text = e.description
        }
    }
}

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