plugins/org.eclipse.ease.lang.javascript.rhino/src/org/eclipse/ease/lang/javascript/rhino/debugger/editor/JavaScriptWordFinder.java

/*******************************************************************************
 * Copyright (c) 2000, 2007 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/

package org.eclipse.ease.lang.javascript.rhino.debugger.editor;

import org.eclipse.jface.text.BadLocationException;
import org.eclipse.jface.text.IDocument;
import org.eclipse.jface.text.IRegion;
import org.eclipse.jface.text.Region;

/**
 * Copied from:
 * http://git.eclipse.org/c/jsdt/webtools.jsdt.git/tree/bundles/org.eclipse.wst.jsdt.ui/src/org/eclipse/wst/jsdt/internal/ui/text/JavaWordFinder.java to avoid
 * internal API access.
 */
public class JavaScriptWordFinder {

	public static IRegion findWord(IDocument document, int offset) {

		int start = -2;
		int end = -1;

		try {
			int pos = offset;
			char c;

			while (pos >= 0) {
				c = document.getChar(pos);
				if (!Character.isJavaIdentifierPart(c))
					break;
				--pos;
			}
			start = pos;

			pos = offset;
			final int length = document.getLength();

			while (pos < length) {
				c = document.getChar(pos);
				if (!Character.isJavaIdentifierPart(c))
					break;
				++pos;
			}
			end = pos;

		} catch (final BadLocationException x) {
		}

		if ((start >= -1) && (end > -1)) {
			if ((start == offset) && (end == offset))
				return new Region(offset, 0);
			else if (start == offset)
				return new Region(start, end - start);
			else
				return new Region(start + 1, end - start - 1);
		}

		return null;
	}
}