/*******************************************************************************
* Copyright (c) 2008 Abner Ballardo and others.
* 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:
* Abner Ballardo <modlost@modlost.net> - initial API and implementation via bug 197745
******************************************************************************/
package org.eclipse.ecf.internal.irc.ui.hyperlink;
import java.util.StringTokenizer;
import org.eclipse.ecf.presence.ui.chatroom.ChatRoomManagerView;
import org.eclipse.jface.text.BadLocationException;
import org.eclipse.jface.text.IDocument;
import org.eclipse.jface.text.IRegion;
import org.eclipse.jface.text.ITextViewer;
import org.eclipse.jface.text.Region;
import org.eclipse.jface.text.hyperlink.IHyperlink;
public class IRCChannelHyperlinkDetector extends org.eclipse.jface.text.hyperlink.AbstractHyperlinkDetector {
public static final String DEFAULT_PREFIX = "#"; //$NON-NLS-1$
public static final String DEFAULT_ENDDELIMITERS = " \t\n\r\f<>"; //$NON-NLS-1$
/*
* (non-Javadoc)
*
* @see org.eclipse.jface.text.hyperlink.IHyperlinkDetector#detectHyperlinks(org.eclipse.jface.text.ITextViewer,
* org.eclipse.jface.text.IRegion, boolean)
*/
public IHyperlink[] detectHyperlinks(ITextViewer textViewer, IRegion region, boolean canShowMultipleHyperlinks) {
if (region == null || textViewer == null)
return null;
final ChatRoomManagerView view = (ChatRoomManagerView) getAdapter(ChatRoomManagerView.class);
final IDocument document = textViewer.getDocument();
if (document == null)
return null;
final int offset = region.getOffset();
IRegion lineInfo;
String line;
try {
lineInfo = document.getLineInformationOfOffset(offset);
line = document.get(lineInfo.getOffset(), lineInfo.getLength());
} catch (final BadLocationException ex) {
return null;
}
final Region detectedRegion = detectRegion(lineInfo, line, offset - lineInfo.getOffset());
if (detectedRegion == null)
return null;
final int detectedOffset = detectedRegion.getOffset() - lineInfo.getOffset();
return createHyperLinksForChannel(view, line.substring(detectedOffset, detectedOffset + detectedRegion.getLength()), detectedRegion);
}
private Region detectRegion(IRegion lineInfo, String fromLine, int offsetInLine) {
int resultLength = 0;
int separatorOffset = fromLine.indexOf(DEFAULT_PREFIX);
while (separatorOffset >= 0) {
final StringTokenizer tokenizer = new StringTokenizer(fromLine.substring(separatorOffset + DEFAULT_PREFIX.length()), DEFAULT_ENDDELIMITERS, false);
if (!tokenizer.hasMoreTokens())
return null;
resultLength = tokenizer.nextToken().length() + DEFAULT_PREFIX.length();
if (offsetInLine >= separatorOffset && offsetInLine <= separatorOffset + resultLength)
break;
separatorOffset = fromLine.indexOf(DEFAULT_PREFIX, separatorOffset + 1);
}
if (separatorOffset < 0)
return null;
return new Region(lineInfo.getOffset() + separatorOffset, resultLength);
}
private IHyperlink[] createHyperLinksForChannel(ChatRoomManagerView view, String channel, Region region) {
return new IHyperlink[] {new IRCChannelHyperlink(view, channel, region)};
}
}