public static FilePatcher FromPatchFile(string patchFilePath, string rootDir = "")
{
return(new FilePatcher {
patchFilePath = patchFilePath,
patchFile = PatchFile.FromText(File.ReadAllText(patchFilePath)),
rootDir = rootDir
});
}
public static PatchFile FromLines(IEnumerable <string> lines, bool verifyHeaders = true)
{
var patchFile = new PatchFile();
Patch patch = null;
int delta = 0;
int i = 0;
foreach (var line in lines)
{
i++;
//ignore blank lines
if (line.Length == 0)
{
continue;
}
//context
if (patch == null && line[0] != '@')
{
if (i == 1 && line.StartsWith("--- "))
{
patchFile.basePath = line.Substring(4);
}
else if (i == 2 && line.StartsWith("+++ "))
{
patchFile.patchedPath = line.Substring(4);
}
else
{
throw new ArgumentException($"Invalid context line:{line}");
}
continue;
}
switch (line[0])
{
case '@':
var m = HunkOffsetRegex.Match(line);
if (!m.Success)
{
throw new ArgumentException($"Invalid patch line {i}:{line}");
}
patch = new Patch {
start1 = int.Parse(m.Groups[1].Value) - 1,
length1 = int.Parse(m.Groups[2].Value),
length2 = int.Parse(m.Groups[4].Value)
};
//auto calc applied offset
if (m.Groups[3].Value == "_")
{
patch.start2 = patch.start1 + delta;
}
else
{
patch.start2 = int.Parse(m.Groups[3].Value) - 1;
if (verifyHeaders && patch.start2 != patch.start1 + delta)
{
throw new ArgumentException($"Applied Offset Mismatch. Expected: {patch.start1 + delta + 1}, Actual: {patch.start2 + 1}");
}
}
delta += patch.length2 - patch.length1;
patchFile.patches.Add(patch);
break;
case ' ':
patch.diffs.Add(new Diff(Operation.EQUAL, line.Substring(1)));
break;
case '+':
patch.diffs.Add(new Diff(Operation.INSERT, line.Substring(1)));
break;
case '-':
patch.diffs.Add(new Diff(Operation.DELETE, line.Substring(1)));
break;
default:
throw new ArgumentException($"Invalid patch line {i}:{line}");
}
}
if (verifyHeaders)
{
foreach (var p in patchFile.patches)
{
if (p.length1 != p.ContextLines.Count())
{
throw new ArgumentException($"Context length doesn't match contents: {p.Header}");
}
if (p.length2 != p.PatchedLines.Count())
{
throw new ArgumentException($"Patched length doesn't match contents: {p.Header}");
}
}
}
return(patchFile);
}
