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optimize<Diff>: use custom chunker instead of CharacterDiff

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This commit is contained in:
leo 2021-07-29 16:47:30 +08:00
parent ce02bb8ab6
commit ef8488de51
1 changed files with 54 additions and 4 deletions
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58
src/Commands/Diff.cs
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@ -8,12 +8,35 @@ namespace SourceGit.Commands {
/// </summary>
public class Diff : Command {
private static readonly Regex REG_INDICATOR = new Regex(@"^@@ \-(\d+),?\d* \+(\d+),?\d* @@");
private static readonly string WORD_SEPS = " \t+-*/=!:;.'\"/?|&#@%`<>()[]{}\\";
private Models.TextChanges changes = new Models.TextChanges();
private List<Models.TextChanges.Line> deleted = new List<Models.TextChanges.Line>();
private List<Models.TextChanges.Line> added = new List<Models.TextChanges.Line>();
private Chunker chunker = new Chunker();
private int oldLine = 0;
private int newLine = 0;
public class Chunker : DiffPlex.IChunker {
public string[] Chunk(string text) {
var start = 0;
var size = text.Length;
var chunks = new List<string>();
for (int i = 0; i < size; i++) {
var ch = text[i];
if (WORD_SEPS.Contains(ch)) {
if (start != i) chunks.Add(text.Substring(start, i - start));
chunks.Add(text.Substring(i, 1));
start = i + 1;
}
}
if (start < size) chunks.Add(text.Substring(start));
return chunks.ToArray();
}
}
public Diff(string repo, string args) {
Cwd = repo;
Args = $"diff --ignore-cr-at-eol --unified=4 {args}";
@ -78,12 +101,39 @@ namespace SourceGit.Commands {
var left = deleted[i];
var right = added[i];
var result = DiffPlex.Differ.Instance.CreateCharacterDiffs(left.Content, right.Content, false, false);
if (result.DiffBlocks.Count > 4) break;
if (left.Content.Length > 1024 || right.Content.Length > 1024) continue;
var result = DiffPlex.Differ.Instance.CreateDiffs(left.Content, right.Content, false, false, chunker);
if (result.DiffBlocks.Count > 4) continue;
foreach (var block in result.DiffBlocks) {
if (block.DeleteCountA > 0) left.Highlights.Add(new Models.TextChanges.HighlightRange(block.DeleteStartA, block.DeleteCountA));
if (block.InsertCountB > 0) right.Highlights.Add(new Models.TextChanges.HighlightRange(block.InsertStartB, block.InsertCountB));
if (block.DeleteCountA > 0) {
var startPos = 0;
for (int j = 0; j < block.DeleteStartA; j++) {
startPos += result.PiecesOld[j].Length;
}
var deleteNum = 0;
for (int j = 0; j < block.DeleteCountA; j++) {
deleteNum += result.PiecesOld[j + block.DeleteStartA].Length;
}
left.Highlights.Add(new Models.TextChanges.HighlightRange(startPos, deleteNum));
}
if (block.InsertCountB > 0) {
var startPos = 0;
for (int j = 0; j < block.InsertStartB; j++) {
startPos += result.PiecesNew[j].Length;
}
var addedNum = 0;
for (int j = 0; j < block.InsertCountB; j++) {
addedNum += result.PiecesNew[j + block.InsertStartB].Length;
}
right.Highlights.Add(new Models.TextChanges.HighlightRange(startPos, addedNum));
}
}
}
}