SyntaxColoring.java Source code

Introduction

Here is the source code for SyntaxColoring.java

Source

import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.ExtendedModifyEvent;
import org.eclipse.swt.custom.ExtendedModifyListener;
import org.eclipse.swt.custom.StyleRange;
import org.eclipse.swt.custom.StyledText;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;

public class SyntaxColoring {
    public static void main(String[] args) {
        final Display display = new Display();
        final Shell shell = new Shell(display);

        final StyledText styledText = new StyledText(shell, SWT.V_SCROLL | SWT.BORDER);

        final String PUNCTUATION = "(){}";
        styledText.addExtendedModifyListener(new ExtendedModifyListener() {
            public void modifyText(ExtendedModifyEvent event) {
                int end = event.start + event.length - 1;

                if (event.start <= end) {
                    String text = styledText.getText(event.start, end);
                    java.util.List ranges = new java.util.ArrayList();

                    for (int i = 0, n = text.length(); i < n; i++) {
                        if (PUNCTUATION.indexOf(text.charAt(i)) > -1) {
                            ranges.add(new StyleRange(event.start + i, 1, display.getSystemColor(SWT.COLOR_BLUE),
                                    null, SWT.BOLD));
                        }
                    }
                    if (!ranges.isEmpty()) {
                        styledText.replaceStyleRanges(event.start, event.length,
                                (StyleRange[]) ranges.toArray(new StyleRange[0]));
                    }
                }
            }
        });

        styledText.setBounds(10, 10, 500, 100);
        shell.open();
        while (!shell.isDisposed()) {
            if (!display.readAndDispatch()) {
                display.sleep();
            }
        }
        display.dispose();
    }
}