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/*******************************************************************************
* Copyright (c) 2005 - 2007 committers of openArchitectureWare 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: committers of openArchitectureWare - initial API and
* implementation
******************************************************************************/
package org.eclipse.xtend.shared.ui.editor.navigation;
import java.util.ArrayList;
import java.util.List;
import org.eclipse.core.resources.IFile;
import org.eclipse.jface.text.IRegion;
import org.eclipse.jface.text.ITextViewer;
import org.eclipse.jface.text.Region;
import org.eclipse.jface.text.hyperlink.IHyperlink;
import org.eclipse.jface.text.hyperlink.IHyperlinkDetector;
import org.eclipse.ui.IEditorPart;
import org.eclipse.ui.IWorkbenchPage;
import org.eclipse.xtend.shared.ui.Activator;
import org.eclipse.xtend.shared.ui.core.IXtendXpandProject;
import org.eclipse.xtend.shared.ui.core.search.SearchMatch;
import org.eclipse.xtend.shared.ui.core.search.XtendXpandSearchEngine;
/**
* GenericHyperlinkDetector is used to detect hyperlinkable words inside oAW
* editors.
*
* @author Peter Friese
*/
public class GenericHyperlinkDetector implements IHyperlinkDetector {
private final IEditorPart editor;
public GenericHyperlinkDetector(IEditorPart editor) {
this.editor = editor;
}
/**
* {@inheritDoc}
*/
public IHyperlink[] detectHyperlinks(ITextViewer textViewer, IRegion region, boolean canShowMultipleHyperlinks) {
if (region == null || textViewer == null) {
return null;
}
// get hyperlinked region
IRegion hyperlinkRegion = getHyperlinkRegion(textViewer, region.getOffset());
if (hyperlinkRegion == null) {
return null;
}
// get the word that is hyperlinked
String hyperlinkedWord = textViewer.getDocument().get().substring(hyperlinkRegion.getOffset(),
hyperlinkRegion.getOffset() + hyperlinkRegion.getLength());
IXtendXpandProject project = getOawProject();
if (project != null) {
List<SearchMatch> matches = XtendXpandSearchEngine.findDeclarations(project, hyperlinkedWord);
List<GenericHyperlink> links = new ArrayList<GenericHyperlink>();
for (SearchMatch searchMatch : matches) {
GenericHyperlink genericHyperlink = new GenericHyperlink(getWorkbenchPage(), searchMatch,
hyperlinkRegion, hyperlinkedWord);
links.add(genericHyperlink);
}
if (canShowMultipleHyperlinks) {
return links.toArray(new IHyperlink[links.size()]);
} else if (!links.isEmpty()) {
return new IHyperlink[] { links.get(0) };
}
}
return null;
}
private IWorkbenchPage getWorkbenchPage() {
return editor.getSite().getWorkbenchWindow().getActivePage();
}
private IXtendXpandProject getOawProject() {
IFile file = getFile();
if (file == null) {
return null;
}
return Activator.getExtXptModelManager().findProject(file);
}
private IFile getFile() {
return (IFile) editor.getEditorInput().getAdapter(IFile.class);
}
/**
* Given a text viewer and an offset (i.e. the current cursor position),
* analyses the region around this location in order to find the word under
* the cursor.
*
* @param textViewer
* The underlying text viewer.
* @param offset
* The cursor location.
* @return The document region defining the hyperlinked word.
*/
private IRegion getHyperlinkRegion(ITextViewer textViewer, int offset) {
String currDoc = textViewer.getDocument().get();
// special handling if cursor is located at end of document
if (offset == currDoc.length()) {
return null;
}
// find word start
int start = offset;
while (start > -1 && WordDetector.isWordPart(currDoc.charAt(start))) {
start--;
}
// find word end
start++;
int end = offset;
while (end < currDoc.length() && WordDetector.isWordPart(currDoc.charAt(end))) {
end++;
}
if (start < 0) {
start = 0;
}
if (end < start) {
end = start;
}
return new Region(start, end - start);
}
}
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