private static DiffHunk ReadHunk(LineReader reader)
{
// Read hunk header
string header = reader.Current;
if (String.IsNullOrEmpty(header))
{
return null;
}
Match m = HunkHeaderRegex.Match(header);
if (!m.Success)
{
// End of file diff
return null;
}
reader.NextLine();
SourceCoordinate original = ReadSourceCoord(m.Groups["l1"].Value, m.Groups["c1"].Value);
SourceCoordinate modified = ReadSourceCoord(m.Groups["l2"].Value, m.Groups["c2"].Value);
string comment = m.Groups["c"].Value.Trim();
DiffHunk hunk = new DiffHunk(original, modified, comment);
LineDiff line;
while ((line = ReadLine(reader)) != null)
{
hunk.Lines.Add(line);
}
return hunk;
}
public virtual IList<DiffHunk> ReadHunks(TextReader source)
{
if (source == null) { throw new ArgumentNullException("source"); }
LineReader reader = new LineReader(source);
reader.NextLine();
return ReadHunks(reader);
}
private static string ReadFileName(LineReader reader, string expectedPrefix)
{
string line = reader.Current.Trim();
if (!line.StartsWith(expectedPrefix))
{
throw new FormatException("Invalid Unified Diff header");
}
reader.NextLine();
// Extract file name
return line.Substring(3).Trim();
}
public virtual DiffSet Read(TextReader source)
{
if (source == null) { throw new ArgumentNullException("source"); }
LineReader reader = new LineReader(source);
reader.NextLine();
// Scan for a file start line ("---")
ICollection<FileDiff> files = new List<FileDiff>();
while (!reader.EndOfFile)
{
while (!reader.EndOfFile && !reader.Current.StartsWith("---")) { reader.NextLine(); }
if (!reader.EndOfFile)
{
files.Add(ReadFile(reader));
}
}
return new DiffSet(files);
}
private static IList<DiffHunk> ReadHunks(LineReader reader)
{
IList<DiffHunk> hunks = new List<DiffHunk>();
DiffHunk hunk;
while ((hunk = ReadHunk(reader)) != null)
{
hunks.Add(hunk);
}
return hunks;
}
private static FileDiff ReadFile(LineReader reader)
{
string original = ReadFileName(reader, "---");
string modified = ReadFileName(reader, "+++");
return new FileDiff(original, modified, ReadHunks(reader));
}
private static LineDiff ReadLine(LineReader reader)
{
while (!reader.EndOfFile && String.IsNullOrWhiteSpace(reader.Current))
{
reader.NextLine();
}
if (reader.EndOfFile) { return null; }
LineDiffType type;
char typeChar = reader.Current[0];
switch (typeChar)
{
case '+':
type = LineDiffType.Added;
break;
case '-':
type = LineDiffType.Removed;
break;
case ' ':
type = LineDiffType.Same;
break;
default:
// Start of next hunk or file
return null;
}
LineDiff line = new LineDiff(type, reader.Current.Substring(1).TrimEnd('\n', '\r'));
reader.NextLine();
return line;
}