public static IEnumerable <DiffChunk> ParseFragment(string diff)
{
var reader = new LineReader(diff);
string line;
DiffChunk chunk = null;
int diffLine = -1;
int oldLine = -1;
int newLine = -1;
while ((line = reader.ReadLine()) != null)
{
var headerMatch = ChunkHeaderRegex.Match(line);
if (headerMatch.Success)
{
if (chunk != null)
{
yield return(chunk);
}
if (diffLine == -1)
{
diffLine = 0;
}
chunk = new DiffChunk
{
OldLineNumber = oldLine = int.Parse(headerMatch.Groups[1].Value),
NewLineNumber = newLine = int.Parse(headerMatch.Groups[2].Value),
DiffLine = diffLine,
};
}
else if (chunk != null)
{
var type = GetLineChange(line[0]);
// This might contain info about previous line (e.g. "\ No newline at end of file").
if (type != DiffChangeType.Control)
{
chunk.Lines.Add(new DiffLine
{
Type = type,
OldLineNumber = type != DiffChangeType.Add ? oldLine : -1,
NewLineNumber = type != DiffChangeType.Delete ? newLine : -1,
DiffLineNumber = diffLine,
Content = line,
});
var lineCount = 1;
lineCount += LineReader.CountCarriageReturns(line);
switch (type)
{
case DiffChangeType.None:
oldLine += lineCount;
newLine += lineCount;
break;
case DiffChangeType.Delete:
oldLine += lineCount;
break;
case DiffChangeType.Add:
newLine += lineCount;
break;
}
}
}
if (diffLine != -1)
{
++diffLine;
}
}
if (chunk != null)
{
yield return(chunk);
}
}