/*=============================================================================#
# Copyright (c) 2006-2016 Stephan Wahlbrink (WalWare.de) and others.
# All rights reserved. This program and the accompanying materials
# are made available under the terms of the Eclipse Public License v1.0
# which accompanies this distribution, and is available at
# http://www.eclipse.org/legal/epl-v10.html
#
# Contributors:
# Stephan Wahlbrink - initial API and implementation
#=============================================================================*/
package de.walware.ecommons.ltk.ui.sourceediting.actions;
import org.eclipse.core.commands.AbstractHandler;
import org.eclipse.core.commands.ExecutionEvent;
import org.eclipse.core.commands.ExecutionException;
import org.eclipse.jface.text.IDocument;
import org.eclipse.jface.text.IRegion;
import org.eclipse.jface.text.ITextSelection;
import org.eclipse.jface.text.ITextViewerExtension5;
import org.eclipse.jface.text.source.ICharacterPairMatcher;
import org.eclipse.jface.text.source.ISourceViewer;
import org.eclipse.swt.widgets.Display;
import org.eclipse.ui.texteditor.IEditorStatusLine;
import de.walware.ecommons.text.ICharPairMatcher;
import de.walware.ecommons.ltk.internal.ui.EditingMessages;
import de.walware.ecommons.ltk.ui.sourceediting.ISourceEditor;
public class GotoMatchingBracketHandler extends AbstractHandler {
private final ISourceEditor fSourceEditor;
private final ICharPairMatcher fPairMatcher;
public GotoMatchingBracketHandler(final ICharPairMatcher pairMatcher, final ISourceEditor editor) {
assert (pairMatcher != null);
assert (editor != null);
fSourceEditor = editor;
fPairMatcher = pairMatcher;
// setBaseEnabled(true);
}
@Override
public Object execute(final ExecutionEvent event) throws ExecutionException {
gotoMatchingBracket();
return null;
}
/**
* Jumps to the matching bracket.
*/
public void gotoMatchingBracket() {
final ISourceViewer sourceViewer = fSourceEditor.getViewer();
if (sourceViewer == null) {
return;
}
final IDocument document = sourceViewer.getDocument();
final ITextSelection selection = (ITextSelection) sourceViewer.getSelectionProvider().getSelection();
final int offset = selection.getOffset();
final int selectionLength = selection.getLength();
final IRegion region = (selectionLength <= 1) ?
fPairMatcher.match(document, offset, (selection.getLength() == 0)): null;
{ String message = null;
if (region == null) {
message = EditingMessages.GotoMatchingBracketAction_error_InvalidSelection;
}
else if (region.getLength() < 2) {
if (region.getLength() >= 0) {
return; // invalid
}
message = EditingMessages.GotoMatchingBracketAction_error_NoMatchingBracket;
}
if (message != null) {
final IEditorStatusLine statusLine = (IEditorStatusLine) fSourceEditor.getAdapter(IEditorStatusLine.class);
if (statusLine != null) {
statusLine.setMessage(true, message, null);
}
Display.getCurrent().beep();
return;
}
}
{ final int targetOffset = (fPairMatcher.getAnchor() == ICharacterPairMatcher.RIGHT) ?
region.getOffset() + 1 : region.getOffset() + region.getLength() - 1;
boolean visible = false;
if (sourceViewer instanceof ITextViewerExtension5) {
final ITextViewerExtension5 extension = (ITextViewerExtension5) sourceViewer;
visible = (extension.modelOffset2WidgetOffset(targetOffset) > -1);
} else {
final IRegion visibleRegion = sourceViewer.getVisibleRegion();
visible = (targetOffset >= visibleRegion.getOffset() && targetOffset <= visibleRegion.getOffset() + visibleRegion.getLength());
}
if (!visible) {
final IEditorStatusLine statusLine = (IEditorStatusLine) fSourceEditor.getAdapter(IEditorStatusLine.class);
if (statusLine != null) {
statusLine.setMessage(true, EditingMessages.GotoMatchingBracketAction_error_BracketOutsideSelectedElement, null);
}
Display.getCurrent().beep();
return;
}
sourceViewer.setSelectedRange(targetOffset, 0);
sourceViewer.revealRange(targetOffset, 0);
}
}
}