droolsdoubleclickstrategy.java

drools 一个开放源码的规则引擎

package org.drools.ide.editors;

import org.eclipse.jface.text.*;

/**
 * The Drools double click strategy.
 * 
 * @author <a href="mailto:[e-mail]">kris verlaenen </a>
 */
public class DroolsDoubleClickStrategy implements ITextDoubleClickStrategy {
	protected ITextViewer fText;

	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);
	}
}