plugins/org.eclipse.ease.lang.javascript.ui/src/org/eclipse/ease/lang/javascript/ui/ResourceHyperlinkDetector.java

/*******************************************************************************
 * Copyright (c) 2014 Christian Pontesegger 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:
 *     Christian Pontesegger - initial API and implementation
 *******************************************************************************/
package org.eclipse.ease.lang.javascript.ui;

 import java.util.regex.Matcher;
 import java.util.regex.Pattern;

 import org.eclipse.core.resources.IFile;
 import org.eclipse.ease.tools.ResourceTools;
 import org.eclipse.jface.text.BadLocationException;
 import org.eclipse.jface.text.IDocument;
 import org.eclipse.jface.text.IRegion;
 import org.eclipse.jface.text.ITextViewer;
 import org.eclipse.jface.text.Region;
 import org.eclipse.jface.text.hyperlink.AbstractHyperlinkDetector;
 import org.eclipse.jface.text.hyperlink.IHyperlink;
 import org.eclipse.ui.IEditorInput;
 import org.eclipse.ui.PlatformUI;
 import org.eclipse.ui.part.FileEditorInput;

 public class ResourceHyperlinkDetector extends AbstractHyperlinkDetector {

	 private static final Pattern STRING_LITERAL = Pattern.compile("(?:\"(.*?)\")|(?:'(.*?)')");

	 @Override
	 public IHyperlink[] detectHyperlinks(final ITextViewer textViewer, final IRegion region, final boolean canShowMultipleHyperlinks) {
		 IDocument document = textViewer.getDocument();

		 IRegion lineInformation;
		 String line;
		 try {
			 lineInformation = document.getLineInformationOfOffset(region.getOffset());
			 line = document.get(lineInformation.getOffset(), lineInformation.getLength());
		 } catch (BadLocationException e) {
			 return null;
		 }

		 int offsetInLine = region.getOffset() - lineInformation.getOffset();
		 Matcher matcher = STRING_LITERAL.matcher(line);

		 while (matcher.find()) {
			 // literal detected, see if it is under the cursor
			 if ((offsetInLine >= matcher.start()) && (offsetInLine < matcher.end())) {
				 // extract filename
				 String filename = matcher.group((matcher.group(1) != null) ? 1 : 2);

				 // try to locate parent file
				 IFile parent = null;
				 IEditorInput input = PlatformUI.getWorkbench().getActiveWorkbenchWindow().getActivePage().getActiveEditor().getEditorInput();
				 if (input instanceof FileEditorInput)
					 parent = ((FileEditorInput) input).getFile();

				 // resolve target file location
				 Object file = ResourceTools.resolveFile(filename, parent, true);
				 if (file instanceof IFile) {
					 if (((IFile) file).exists()) {
						 Region linkRegion = new Region(lineInformation.getOffset() + matcher.start() + 1, filename.length());
						 return new IHyperlink[] { new ResourceHyperlink((IFile) file, linkRegion) };
					 }
				 }
			 }
		 }

		 return null;
	 }
 }