SpecfileDoubleClickStrategy.java

/*******************************************************************************
 * Copyright (c) 2007, 2009 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.rpm.ui.editor;

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

public class SpecfileDoubleClickStrategy implements ITextDoubleClickStrategy {
    protected ITextViewer fText;
    //lTerminator should be either '\r' or '\n' depending on the OS
    final char lTerminator = System.getProperty("line.separator").charAt(0); //$NON-NLS-1$

    @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 == lTerminator || 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 == lTerminator || 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);
    }
}