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/*******************************************************************************
* Copyright (c) 2004, 2008 Tasktop Technologies 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:
* Tasktop Technologies - initial API and implementation
* David Green - fix for bug 266693
*******************************************************************************/
package org.eclipse.mylyn.internal.tasks.ui.editors;
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;
import org.eclipse.jface.text.hyperlink.AbstractHyperlinkDetector;
import org.eclipse.jface.text.hyperlink.IHyperlink;
import org.eclipse.mylyn.tasks.ui.TasksUiUtil;
/**
* Source from {@link org.eclipse.jface.text.hyperlink.URLHyperlinkDetector}. Returns hyperlinks that use
* {@link TasksUiUtil} to open urls.
*
* @author Rob Elves
*/
public class TaskUrlHyperlinkDetector extends AbstractHyperlinkDetector {
public IHyperlink[] detectHyperlinks(ITextViewer textViewer, IRegion region, boolean canShowMultipleHyperlinks) {
if (region == null || textViewer == null) {
return null;
}
IDocument document = textViewer.getDocument();
int offset = region.getOffset();
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();
return findHyperlinks(line, offsetInLine, lineInfo.getOffset(), region.getLength());
}
private IHyperlink[] findHyperlinks(String line, int offsetInLine, int offset, int regionLength) {
char doubleChar = ' ';
String urlString = null;
boolean startDoubleQuote = false;
int urlOffsetInLine = 0;
int urlLength = 0;
int urlSeparatorOffset = line.indexOf("://"); //$NON-NLS-1$
while (urlSeparatorOffset >= 0) {
// URL protocol (left to "://")
urlOffsetInLine = urlSeparatorOffset;
char ch;
do {
urlOffsetInLine--;
ch = ' ';
if (urlOffsetInLine > -1) {
ch = line.charAt(urlOffsetInLine);
}
} while (Character.isUnicodeIdentifierStart(ch));
urlOffsetInLine++;
switch (ch) {
case '"':
doubleChar = '"';
break;
case '\'':
doubleChar = '\'';
break;
case '[':
doubleChar = ']';
break;
case '(':
doubleChar = ')';
break;
case '{':
doubleChar = '}';
break;
default:
doubleChar = ' ';
break;
}
startDoubleQuote = doubleChar != ' ';
// Right to "://"
StringTokenizer tokenizer = new StringTokenizer(line.substring(urlSeparatorOffset + 3),
" \t\n\r\f<>", false); //$NON-NLS-1$
if (!tokenizer.hasMoreTokens()) {
return null;
}
urlLength = tokenizer.nextToken().length() + 3 + urlSeparatorOffset - urlOffsetInLine;
if ((regionLength == 0 && offsetInLine >= urlOffsetInLine && offsetInLine <= urlOffsetInLine + urlLength)
|| ((regionLength > 0 && offsetInLine <= urlOffsetInLine && (offsetInLine + regionLength) > urlOffsetInLine))) {
// region length of 0 and offset hits within the hyperlink url
// OR
// region spans the start of the hyperlink url.
break;
}
urlSeparatorOffset = line.indexOf("://", urlSeparatorOffset + 1); //$NON-NLS-1$
}
if (urlSeparatorOffset < 0) {
return null;
}
if (startDoubleQuote) {
int endOffset = -1;
int nextDoubleQuote = line.indexOf(doubleChar, 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 {
char lastChar = line.charAt(urlOffsetInLine + urlLength - 1);
if (lastChar == ',' || lastChar == '.') {
urlLength--;
}
if (urlLength > 0) {
lastChar = line.charAt(urlOffsetInLine + urlLength - 1);
if (lastChar == ')') {
urlLength--;
}
}
urlString = line.substring(urlOffsetInLine, urlOffsetInLine + urlLength);
new URL(urlString);
} catch (MalformedURLException ex) {
urlString = null;
return null;
}
IRegion urlRegion = new Region(offset + urlOffsetInLine, urlLength);
return new IHyperlink[] { new TaskUrlHyperlink(urlRegion, urlString) };
}
}
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