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/*******************************************************************************
* Copyright (c) 2000, 2006 IBM Corporation 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:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.jface.text.hyperlink;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.StringTokenizer;
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;
/**
* URL hyperlink detector.
*
* @since 3.1
*/
public class URLHyperlinkDetector implements IHyperlinkDetector {
/**
* Creates a new URL hyperlink detector.
*
* @since 3.2
*/
public URLHyperlinkDetector() {
}
/**
* Creates a new URL hyperlink detector.
*
* @param textViewer the text viewer in which to detect the hyperlink
* @deprecated As of 3.2, replaced by {@link URLHyperlinkDetector}
*/
public URLHyperlinkDetector(ITextViewer textViewer) {
}
/*
* @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;
IDocument document= textViewer.getDocument();
int offset= region.getOffset();
String urlString= null;
if (document == null)
return null;
IRegion lineInfo;
String line;
try {
lineInfo= document.getLineInformationOfOffset(offset);
line= document.get(lineInfo.getOffset(), lineInfo.getLength());
} catch (BadLocationException ex) {
return null;
}
int offsetInLine= offset - lineInfo.getOffset();
int urlSeparatorOffset= line.indexOf("://"); //$NON-NLS-1$
if (urlSeparatorOffset < 0)
return null;
boolean startDoubleQuote= false;
// URL protocol (left to "://")
int urlOffsetInLine= urlSeparatorOffset;
char ch;
do {
urlOffsetInLine--;
ch= ' ';
if (urlOffsetInLine > -1)
ch= line.charAt(urlOffsetInLine);
startDoubleQuote= ch == '"';
} while (Character.isUnicodeIdentifierStart(ch));
urlOffsetInLine++;
// Right to "://"
StringTokenizer tokenizer= new StringTokenizer(line.substring(urlSeparatorOffset + 3));
if (!tokenizer.hasMoreTokens())
return null;
int urlLength= tokenizer.nextToken().length() + 3 + urlSeparatorOffset - urlOffsetInLine;
if (offsetInLine < urlOffsetInLine || offsetInLine > urlOffsetInLine + urlLength)
return null;
if (startDoubleQuote) {
int endOffset= -1;
int nextDoubleQuote= line.indexOf('"', urlOffsetInLine);
int nextWhitespace= line.indexOf(' ', urlOffsetInLine);
if (nextDoubleQuote != -1 && nextWhitespace != -1)
endOffset= Math.min(nextDoubleQuote, nextWhitespace);
else if (nextDoubleQuote != -1)
endOffset= nextDoubleQuote;
else if (nextWhitespace != -1)
endOffset= nextWhitespace;
if (endOffset != -1)
urlLength= endOffset - urlOffsetInLine;
}
// Set and validate URL string
try {
urlString= line.substring(urlOffsetInLine, urlOffsetInLine + urlLength);
new URL(urlString);
} catch (MalformedURLException ex) {
urlString= null;
return null;
}
IRegion urlRegion= new Region(lineInfo.getOffset() + urlOffsetInLine, urlLength);
return new IHyperlink[] {new URLHyperlink(urlRegion, urlString)};
}
}
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