dearwolf/sourcegit
1
0
Fork 0
mirror of https://github.com/sourcegit-scm/sourcegit synced 2025-05-20 19:55:00 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions 2

optimize<Diff>: simplify DiffPlex algorithm

Browse source
This commit is contained in:
leo 2021-07-29 20:42:44 +08:00
parent 44873cf088
commit d259d67fd5
4 changed files with 287 additions and 65 deletions
Download patch file Download diff file Expand all files Collapse all files

71
src/Commands/Diff.cs
View file

@ -1,5 +1,6 @@
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;
namespace SourceGit.Commands {
@ -8,44 +9,12 @@ 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++) {
#if NET48
var ch = text.Substring(i, 1);
if (WORD_SEPS.Contains(ch)) {
if (start != i) chunks.Add(text.Substring(start, i - start));
chunks.Add(ch);
start = i + 1;
}
#else
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;
}
#endif
}
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}";
@ -104,7 +73,7 @@ namespace SourceGit.Commands {
}
private void ProcessChanges() {
if (deleted.Count > 0) {
if (deleted.Any()) {
if (added.Count == deleted.Count) {
for (int i = added.Count - 1; i >= 0; i--) {
var left = deleted[i];
@ -112,36 +81,16 @@ namespace SourceGit.Commands {
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;
var chunks = Models.TextCompare.Process(left.Content, right.Content);
if (chunks.Count > 4) continue;
foreach (var block in result.DiffBlocks) {
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));
foreach (var chunk in chunks) {
if (chunk.DeletedCount > 0) {
left.Highlights.Add(new Models.TextChanges.HighlightRange(chunk.DeletedStart, chunk.DeletedCount));
}
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));
if (chunk.AddedCount > 0) {
right.Highlights.Add(new Models.TextChanges.HighlightRange(chunk.AddedStart, chunk.AddedCount));
}
}
}
@ -151,7 +100,7 @@ namespace SourceGit.Commands {
deleted.Clear();
}
if (added.Count > 0) {
if (added.Any()) {
changes.Lines.AddRange(added);
added.Clear();
}