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/*******************************************************************************
 * Copyright (c) 2014 Red Hat, Inc.
 * 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:
 *     Red Hat - initial API and implementation
 *******************************************************************************/

package org.eclipse.linuxtools.internal.systemtap.ui.ide.handlers;

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

import org.eclipse.core.commands.AbstractHandler;
import org.eclipse.core.commands.ExecutionEvent;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.StructuredSelection;
import org.eclipse.linuxtools.internal.systemtap.ui.ide.CommentRemover;
import org.eclipse.linuxtools.internal.systemtap.ui.ide.editors.stp.STPEditor;
import org.eclipse.linuxtools.internal.systemtap.ui.ide.structures.ISearchableNode;
import org.eclipse.linuxtools.systemtap.structures.TreeDefinitionNode;
import org.eclipse.linuxtools.systemtap.ui.editor.actions.file.OpenFileAction;
import org.eclipse.ui.IEditorPart;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.handlers.HandlerUtil;

public class DefinitionHandler extends AbstractHandler {

	@Override
	public Object execute(ExecutionEvent event) {
		TreeDefinitionNode t = getSelection(event);
		if(t == null) {
			return null;
		}
		String filename = t.getDefinition();
		if (filename == null) {
			return null;
		}
		File file = new File(filename);
		OpenFileAction open = new OpenFileAction();
		open.run(file);
		if (open.isSuccessful() && t.getData() instanceof ISearchableNode) {
			IEditorPart editorPart = PlatformUI.getWorkbench().getActiveWorkbenchWindow().getActivePage().getActiveEditor();
			STPEditor editor = (STPEditor)editorPart;
			editor.jumpToLocation(findDefinitionLine((ISearchableNode) t.getData(), editor) + 1, 0);
		}
		return null;
	}

	private TreeDefinitionNode getSelection(ExecutionEvent event) {
		ISelection selection = HandlerUtil.getCurrentSelection(event);
		if (selection instanceof StructuredSelection) {
			Object[] selections = ((StructuredSelection) selection).toArray();
			return (selections.length == 1 && selections[0] instanceof TreeDefinitionNode)
					? (TreeDefinitionNode) selections[0] : null;
		}
		return null;
	}

	private int findDefinitionLine(ISearchableNode data, STPEditor editor) {
		int locationIndex;
		String contents = CommentRemover.exec(editor.getDocumentProvider().getDocument(editor.getEditorInput()).get());
		if (data.isRegexSearch()) {
			Pattern pattern = Pattern.compile(data.getSearchToken());
			Matcher matcher = pattern.matcher(contents);
			locationIndex = matcher.find() ? matcher.start() : -1;
		} else {
			locationIndex = contents.indexOf(data.getSearchToken());
		}
		if (locationIndex != -1) {
			// Get the line of the match by counting newlines.
			contents = contents.substring(0, locationIndex);
			return contents.length() - contents.replaceAll("\n", "").length(); //$NON-NLS-1$ //$NON-NLS-2$
		} else {
			return 0;
		}
	}

}

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