public static Diff Compare(string fileOnePath, string fileOneContent, string fileTwoPath, string fileTwoContent, CompareOptions options)
{
if (fileOneContent == null && fileTwoContent == null)
throw new InvalidOperationException("Both files were null");
if (options.BomMode == BomMode.Ignore)
{
if (fileOneContent != null)
fileOneContent = RemoveBom(fileOneContent);
if (fileTwoContent != null)
fileTwoContent = RemoveBom(fileTwoContent);
}
if (fileTwoContent == null)
return DeletedFileDiff(fileOneContent, fileOnePath);
if (fileOneContent == null)
return NewFileDiff(fileTwoContent, fileTwoPath);
if (IsBinary(fileOneContent))
throw new BinaryFileException(fileOnePath);
if (IsBinary(fileTwoContent))
throw new BinaryFileException(fileTwoPath);
var patchMaker = new PatchMaker();
var patches = patchMaker.MakePatch(fileOneContent, fileTwoContent, options);
var chunks = new List<Chunk>();
foreach (var patch in patches)
{
var originalRange = new ChangeRange(patch.start1 + 1, patch.length1);
var newRange = new ChangeRange(patch.start2 + 1, patch.length2);
var range = new ChunkRange(originalRange, newRange);
var snippets = new List<ISnippet>();
var lines = new List<DiffMatchPatch.Diff>();
Operation? previousOperation = null;
var isModification = false;
foreach (var diff in patch.diffs)
{
if (previousOperation == null)
previousOperation = diff.operation;
if (previousOperation == Operation.DELETE && diff.operation == Operation.INSERT)
isModification = true;
else if (previousOperation != diff.operation)
{
// different operation
if (previousOperation == Operation.EQUAL)
snippets.Add(new ContextSnippet(lines.Select(x => new ContextLine(x.text)).Cast<ILine>()));
else if (isModification)
snippets.Add(new ModificationSnippet(
lines
.Where(x => x.operation == Operation.DELETE)
.Select(x => new SubtractionLine(x.text))
.Cast<ILine>(),
lines
.Where(x => x.operation == Operation.INSERT)
.Select(x => new AdditionLine(x.text))
.Cast<ILine>()
));
else if (previousOperation == Operation.INSERT)
snippets.Add(new AdditionSnippet(lines.Select(x => new AdditionLine(x.text)).Cast<ILine>()));
else if (previousOperation == Operation.DELETE)
snippets.Add(new SubtractionSnippet(lines.Select(x => new SubtractionLine(x.text)).Cast<ILine>()));
lines.Clear();
isModification = false;
}
lines.Add(diff);
previousOperation = diff.operation;
}
if (lines.Count > 0)
{
if (previousOperation == Operation.INSERT)
snippets.Add(new AdditionSnippet(lines.Select(x => new AdditionLine(x.text)).Cast<ILine>()));
else if (previousOperation == Operation.DELETE)
snippets.Add(new SubtractionSnippet(lines.Select(x => new SubtractionLine(x.text)).Cast<ILine>()));
else
snippets.Add(new ContextSnippet(lines.Select(x => new ContextLine(x.text)).Cast<ILine>()));
}
chunks.Add(new Chunk(range, snippets));
}
var fileOne = new File('a', fileOnePath);
var fileTwo = new File('b', fileTwoPath);
var header = new DiffHeader(new DiffFormatType("generated"), new[] { fileOne, fileTwo });
return new Diff(header, new IHeader[0], new ChunksHeader(fileOne, fileTwo), chunks);
}
internal static Diff NewFileDiff(string content, string path)
{
var fileOne = new NullFile();
var fileTwo = new File('b', path);
var header = new DiffHeader(new DiffFormatType("generated"), new IFile[] { fileOne, fileTwo });
var lines = content.SplitIntoLines()
.Select(x => (ILine)new AdditionLine(x));
var range = new ChunkRange(new ChangeRange(0, 0), new ChangeRange(1, lines.Count()));
var snippet = new AdditionSnippet(lines);
var chunk = new Chunk(range, new[] { snippet });
return new Diff(header, new IHeader[0], new ChunksHeader(fileOne, fileTwo), new[] { chunk });
}