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/*******************************************************************************
* Copyright (c) 2017 Red Hat Inc. and others.
*
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* - Lucas Bullen (Red Hat Inc.)
*******************************************************************************/
package org.eclipse.ui.genericeditor.examples.dotproject;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Map.Entry;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.preferences.IEclipsePreferences;
import org.eclipse.core.runtime.preferences.IEclipsePreferences.IPreferenceChangeListener;
import org.eclipse.core.runtime.preferences.IEclipsePreferences.PreferenceChangeEvent;
import org.eclipse.core.runtime.preferences.InstanceScope;
import org.eclipse.jface.text.IDocument;
import org.eclipse.jface.text.IRegion;
import org.eclipse.jface.text.ISynchronizable;
import org.eclipse.jface.text.ITextViewer;
import org.eclipse.jface.text.ITextViewerExtension5;
import org.eclipse.jface.text.Position;
import org.eclipse.jface.text.reconciler.DirtyRegion;
import org.eclipse.jface.text.reconciler.IReconcilingStrategy;
import org.eclipse.jface.text.reconciler.IReconcilingStrategyExtension;
import org.eclipse.jface.text.source.Annotation;
import org.eclipse.jface.text.source.IAnnotationModel;
import org.eclipse.jface.text.source.IAnnotationModelExtension;
import org.eclipse.jface.text.source.ISourceViewer;
import org.eclipse.swt.custom.CaretEvent;
import org.eclipse.swt.custom.CaretListener;
/**
*
* This Reconciler Strategy is an example for how to override the default highlight strategy.
* It will highlight closing and opening tag names that match the current word the user is on.
*
*/
public class HighlightStrategy implements IReconcilingStrategy, IReconcilingStrategyExtension, CaretListener, IPreferenceChangeListener {
private static final String ANNOTATION_TYPE = "org.eclipse.ui.genericeditor.text"; //$NON-NLS-1$
public static final String TOGGLE_HIGHLIGHT_PREFERENCE = "org.eclipse.ui.genericeditor.togglehighlight"; //$NON-NLS-1$
public static final String GENERIC_EDITOR_BUNDLE_ID = "org.eclipse.ui.genericeditor"; //$NON-NLS-1$
private boolean enabled;
private ISourceViewer sourceViewer;
private IDocument document;
private static final String TAG_NAME_REGEX = "<\\/?\\s*([a-zA-Z]+)"; //$NON-NLS-1$
private static final Pattern TAG_NAME_PATTERN = Pattern.compile(TAG_NAME_REGEX);
private Annotation[] fOccurrenceAnnotations = null;
private void applyHighlights(int offset) {
if (sourceViewer == null || !enabled) {
return;
}
String text = document.get();
offset = ((ITextViewerExtension5)sourceViewer).widgetOffset2ModelOffset(offset);
int wordStartOffset = Math.max(text.lastIndexOf('/',offset),text.lastIndexOf('<',offset))+1;
int wordEndOffset = findEndingOffset(text, offset);
if(wordEndOffset <= wordStartOffset || wordEndOffset == -1 || wordStartOffset == -1)
return;
String word = text.substring(wordStartOffset, wordEndOffset);
if(word.indexOf('>') != -1 || word.indexOf('<') != -1) {
removeOccurrenceAnnotations();
return;
}
Matcher m = TAG_NAME_PATTERN.matcher(text);
Map<Annotation, Position> annotationMap = new HashMap<>();
while(m.find()) {
if(m.group(1).equals(word)) {
annotationMap.put(new Annotation(ANNOTATION_TYPE, false, null),
new Position(m.start(1), m.end(1) - m.start(1)));
}
}
if(annotationMap.size() < 2) {
removeOccurrenceAnnotations();
return;
}
IAnnotationModel annotationModel = sourceViewer.getAnnotationModel();
synchronized (getLockObject(annotationModel)) {
if (annotationModel instanceof IAnnotationModelExtension) {
((IAnnotationModelExtension) annotationModel).replaceAnnotations(fOccurrenceAnnotations, annotationMap);
} else {
removeOccurrenceAnnotations();
Iterator<Entry<Annotation, Position>> iter = annotationMap.entrySet().iterator();
while (iter.hasNext()) {
Entry<Annotation, Position> mapEntry = iter.next();
annotationModel.addAnnotation(mapEntry.getKey(), mapEntry.getValue());
}
}
fOccurrenceAnnotations = annotationMap.keySet().toArray(new Annotation[annotationMap.size()]);
}
}
private static int findEndingOffset(String text, int offset) {
String substring = text.substring(offset);
String[] split = substring.split("[^a-zA-Z0-9]+");//$NON-NLS-1$
if(split.length == 0) {
return -1;
}
return offset + split[0].length();
}
public void install(ITextViewer viewer) {
if (!(viewer instanceof ISourceViewer)) {
return;
}
IEclipsePreferences preferences = InstanceScope.INSTANCE.getNode(GENERIC_EDITOR_BUNDLE_ID);
preferences.addPreferenceChangeListener(this);
this.enabled = preferences.getBoolean(TOGGLE_HIGHLIGHT_PREFERENCE, true);
this.sourceViewer = (ISourceViewer) viewer;
this.sourceViewer.getTextWidget().addCaretListener(this);
}
public void uninstall() {
if (sourceViewer != null) {
sourceViewer.getTextWidget().removeCaretListener(this);
}
IEclipsePreferences preferences = InstanceScope.INSTANCE.getNode(GENERIC_EDITOR_BUNDLE_ID);
preferences.removePreferenceChangeListener(this);
}
@Override
public void preferenceChange(PreferenceChangeEvent event) {
if (event.getKey().equals(TOGGLE_HIGHLIGHT_PREFERENCE)) {
this.enabled = Boolean.parseBoolean(event.getNewValue().toString());
if (enabled) {
initialReconcile();
} else {
removeOccurrenceAnnotations();
}
}
}
@Override
public void caretMoved(CaretEvent event) {
applyHighlights(event.caretOffset);
}
@Override
public void initialReconcile() {
if (sourceViewer != null) {
sourceViewer.getTextWidget().getDisplay().asyncExec(() -> {
if (sourceViewer != null && sourceViewer.getTextWidget() != null) {
applyHighlights(sourceViewer.getTextWidget().getCaretOffset());
}
});
}
}
void removeOccurrenceAnnotations() {
IAnnotationModel annotationModel = sourceViewer.getAnnotationModel();
if (annotationModel == null || fOccurrenceAnnotations == null)
return;
synchronized (getLockObject(annotationModel)) {
if (annotationModel instanceof IAnnotationModelExtension) {
((IAnnotationModelExtension) annotationModel).replaceAnnotations(fOccurrenceAnnotations, null);
} else {
for (Annotation fOccurrenceAnnotation : fOccurrenceAnnotations)
annotationModel.removeAnnotation(fOccurrenceAnnotation);
}
fOccurrenceAnnotations = null;
}
}
private static Object getLockObject(IAnnotationModel annotationModel) {
if (annotationModel instanceof ISynchronizable) {
Object lock = ((ISynchronizable) annotationModel).getLockObject();
if (lock != null)
return lock;
}
return annotationModel;
}
@Override
public void setDocument(IDocument document) {
this.document = document;
}
@Override
public void reconcile(DirtyRegion dirtyRegion, IRegion subRegion) {
// Do nothing
}
@Override
public void reconcile(IRegion partition) {
// Do nothing
}
@Override
public void setProgressMonitor(IProgressMonitor monitor) {
// Not used
}
}
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