XMLDoubleClickStrategy.java

/*-
 * Copyright © 2009 Diamond Light Source Ltd.
 *
 * This file is part of GDA.
 *
 * GDA is free software: you can redistribute it and/or modify it under the
 * terms of the GNU General Public License version 3 as published by the Free
 * Software Foundation.
 *
 * GDA is distributed in the hope that it will be useful, but WITHOUT ANY
 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License along
 * with GDA. If not, see <http://www.gnu.org/licenses/>.
 */

package uk.ac.gda.richbeans.editors.xml.bean;

import org.eclipse.jface.text.BadLocationException;
import org.eclipse.jface.text.IDocument;
import org.eclipse.jface.text.ITextDoubleClickStrategy;
import org.eclipse.jface.text.ITextViewer;

/**
 * @author Matthew Gerring
 *
 */
public class XMLDoubleClickStrategy implements ITextDoubleClickStrategy {
	protected ITextViewer fText;

	@Override
	public void doubleClicked(ITextViewer part) {
		int pos = part.getSelectedRange().x;

		if (pos < 0)
			return;

		fText = part;

		if (!selectComment(pos)) {
			selectWord(pos);
		}
	}
	protected boolean selectComment(int caretPos) {
		IDocument doc = fText.getDocument();
		int startPos, endPos;

		try {
			int pos = caretPos;
			char c = ' ';

			while (pos >= 0) {
				c = doc.getChar(pos);
				if (c == '\\') {
					pos -= 2;
					continue;
				}
				if (c == Character.LINE_SEPARATOR || c == '\"')
					break;
				--pos;
			}

			if (c != '\"')
				return false;

			startPos = pos;

			pos = caretPos;
			int length = doc.getLength();
			c = ' ';

			while (pos < length) {
				c = doc.getChar(pos);
				if (c == Character.LINE_SEPARATOR || c == '\"')
					break;
				++pos;
			}
			if (c != '\"')
				return false;

			endPos = pos;

			int offset = startPos + 1;
			int len = endPos - offset;
			fText.setSelectedRange(offset, len);
			return true;
		} catch (BadLocationException x) {
		}

		return false;
	}
	protected boolean selectWord(int caretPos) {

		IDocument doc = fText.getDocument();
		int startPos, endPos;

		try {

			int pos = caretPos;
			char c;

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

			startPos = pos;

			pos = caretPos;
			int length = doc.getLength();

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

			endPos = pos;
			selectRange(startPos, endPos);
			return true;

		} catch (BadLocationException x) {
		}

		return false;
	}

	private void selectRange(int startPos, int stopPos) {
		int offset = startPos + 1;
		int length = stopPos - offset;
		fText.setSelectedRange(offset, length);
	}
}