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package com.gitblit.utils;
import static org.eclipse.jgit.lib.Constants.encodeASCII;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import org.eclipse.jgit.diff.DiffFormatter;
import org.eclipse.jgit.diff.RawText;
public class HtmlDiffFormatter extends DiffFormatter {
private final OutputStream os;
public HtmlDiffFormatter(OutputStream os) {
super(os);
this.os = os;
}
/**
* Output a hunk header
*
* @param aStartLine
* within first source
* @param aEndLine
* within first source
* @param bStartLine
* within second source
* @param bEndLine
* within second source
* @throws IOException
*/
@Override
protected void writeHunkHeader(int aStartLine, int aEndLine, int bStartLine, int bEndLine) throws IOException {
os.write("<div class=\"diff hunk_header\"><span class=\"diff hunk_info\">".getBytes());
os.write('@');
os.write('@');
writeRange('-', aStartLine + 1, aEndLine - aStartLine);
writeRange('+', bStartLine + 1, bEndLine - bStartLine);
os.write(' ');
os.write('@');
os.write('@');
os.write("</span></div>".getBytes());
}
private void writeRange(final char prefix, final int begin, final int cnt) throws IOException {
os.write(' ');
os.write(prefix);
switch (cnt) {
case 0:
// If the range is empty, its beginning number must
// be the
// line just before the range, or 0 if the range is
// at the
// start of the file stream. Here, begin is always 1
// based,
// so an empty file would produce "0,0".
//
os.write(encodeASCII(begin - 1));
os.write(',');
os.write('0');
break;
case 1:
// If the range is exactly one line, produce only
// the number.
//
os.write(encodeASCII(begin));
break;
default:
os.write(encodeASCII(begin));
os.write(',');
os.write(encodeASCII(cnt));
break;
}
}
@Override
protected void writeLine(final char prefix, final RawText text, final int cur) throws IOException {
switch (prefix) {
case '+':
os.write("<span class=\"diff add\">".getBytes());
break;
case '-':
os.write("<span class=\"diff remove\">".getBytes());
break;
}
os.write(prefix);
ByteArrayOutputStream bos = new ByteArrayOutputStream();
text.writeLine(bos, cur);
String line = bos.toString();
line = StringUtils.escapeForHtml(line, false);
os.write(line.getBytes());
switch (prefix) {
case '+':
case '-':
os.write("</span>\n".getBytes());
break;
default:
os.write('\n');
}
}
/**
* Workaround function for complex private methods in DiffFormatter. This
* sets the html for the diff headers.
*
* @return
*/
public String getHtml() {
String html = os.toString();
String[] lines = html.split("\n");
StringBuilder sb = new StringBuilder();
sb.append("<div class=\"diff\">");
for (String line : lines) {
if (line.startsWith("diff")) {
sb.append("<div class=\"diff header\">").append(line).append("</div>");
} else if (line.startsWith("---")) {
sb.append("<span class=\"diff remove\">").append(line).append("</span><br/>");
} else if (line.startsWith("+++")) {
sb.append("<span class=\"diff add\">").append(line).append("</span><br/>");
} else {
sb.append(line).append('\n');
}
}
sb.append("</div>\n");
return sb.toString();
}
}
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