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/*******************************************************************************
* Copyright (c) 2011 GitHub 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:
* Kevin Sawicki (GitHub Inc.) - initial API and implementation
*******************************************************************************/
package org.eclipse.egit.ui.internal.commit;
import java.io.IOException;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.List;
import org.eclipse.egit.core.internal.CompareCoreUtils;
import org.eclipse.egit.ui.internal.commit.DiffStyleRangeFormatter.DiffStyleRange.Type;
import org.eclipse.egit.ui.internal.history.FileDiff;
import org.eclipse.jface.text.BadLocationException;
import org.eclipse.jface.text.IDocument;
import org.eclipse.jgit.diff.DiffFormatter;
import org.eclipse.jgit.diff.RawText;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.swt.custom.StyleRange;
import org.eclipse.swt.graphics.Color;
/**
* Diff style range formatter class that builds up a list of
* {@link DiffStyleRange} instances as each {@link FileDiff} is being written to
* an {@link IDocument}.
*/
public class DiffStyleRangeFormatter extends DiffFormatter {
/**
* Diff style range
*/
public static class DiffStyleRange extends StyleRange {
/**
* Diff type
*/
public enum Type {
/**
* Added line
*/
ADD,
/**
* Removed line
*/
REMOVE,
/**
* Hunk line
*/
HUNK,
/**
* Other line
*/
OTHER,
}
@Override
public boolean equals(Object object) {
return super.equals(object);
}
@Override
public int hashCode() {
return super.hashCode();
}
/**
* Diff type
*/
public Type diffType = Type.OTHER;
/**
* Line background
*/
public Color lineBackground = null;
public boolean similarTo(StyleRange style) {
return super.similarTo(style) && style instanceof DiffStyleRange
&& diffType == ((DiffStyleRange) style).diffType;
}
}
private static class DocumentOutputStream extends OutputStream {
private String charset;
private IDocument document;
private int offset;
public DocumentOutputStream(IDocument document, int offset) {
this.document = document;
this.offset = offset;
}
private void write(String content) throws IOException {
try {
this.document.replace(this.offset, 0, content);
this.offset += content.length();
} catch (BadLocationException e) {
throw new IOException(e.getMessage());
}
}
public void write(byte[] b, int off, int len) throws IOException {
if (charset == null)
write(new String(b, off, len));
else
write(new String(b, off, len, charset));
}
public void write(byte[] b) throws IOException {
write(b, 0, b.length);
}
public void write(int b) throws IOException {
write(new byte[] { (byte) b });
}
}
private DocumentOutputStream stream;
private List<DiffStyleRange> ranges = new ArrayList<DiffStyleRange>();
/**
* @param document
* @param offset
*/
public DiffStyleRangeFormatter(IDocument document, int offset) {
super(new DocumentOutputStream(document, offset));
this.stream = (DocumentOutputStream) getOutputStream();
}
/**
* @param document
*/
public DiffStyleRangeFormatter(IDocument document) {
this(document, document.getLength());
}
/**
* Write diff
*
* @param repository
* @param diff
* @return this formatter
* @throws IOException
*/
public DiffStyleRangeFormatter write(Repository repository, FileDiff diff)
throws IOException {
this.stream.charset = CompareCoreUtils.getResourceEncoding(repository,
diff.getPath());
diff.outputDiff(null, repository, this, true);
flush();
return this;
}
/**
* Get diff style ranges
*
* @return non-null but possibly empty array
*/
public DiffStyleRange[] getRanges() {
return this.ranges.toArray(new DiffStyleRange[this.ranges.size()]);
}
/**
* Create and add diff style range
*
* @param type
* @return added range
*/
protected DiffStyleRange addRange(Type type) {
DiffStyleRange range = new DiffStyleRange();
range.start = stream.offset;
range.diffType = type;
ranges.add(range);
return range;
}
/**
* @see org.eclipse.jgit.diff.DiffFormatter#writeHunkHeader(int, int, int,
* int)
*/
protected void writeHunkHeader(int aStartLine, int aEndLine,
int bStartLine, int bEndLine) throws IOException {
DiffStyleRange range = addRange(Type.HUNK);
super.writeHunkHeader(aStartLine, aEndLine, bStartLine, bEndLine);
range.length = stream.offset - range.start;
}
/**
* @see org.eclipse.jgit.diff.DiffFormatter#writeLine(char,
* org.eclipse.jgit.diff.RawText, int)
*/
protected void writeLine(char prefix, RawText text, int cur)
throws IOException {
if (prefix == ' ')
super.writeLine(prefix, text, cur);
else {
DiffStyleRange range = addRange(prefix == '+' ? Type.ADD
: Type.REMOVE);
super.writeLine(prefix, text, cur);
range.length = stream.offset - range.start;
}
}
}
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