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optimize<TextCompare>: combine two modified parts those have one same unchanged character

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This commit is contained in:
leo 2021-10-08 16:01:46 +08:00
parent cc326495a6
commit ade45732f2
1 changed files with 20 additions and 7 deletions
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27
src/Models/TextCompare.cs
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@ -1,4 +1,4 @@
using System.Collections.Generic;
using System.Collections.Generic;
namespace SourceGit.Models {
@ -84,6 +84,7 @@ namespace SourceGit.Models {
var ret = new List<Different>();
var posOld = 0;
var posNew = 0;
var last = null as Different;
do {
while (posOld < sizeOld && posNew < sizeNew && !chunksOld[posOld].Modified && !chunksNew[posNew].Modified) {
posOld++;
@ -97,13 +98,25 @@ namespace SourceGit.Models {
for (; posOld < sizeOld && chunksOld[posOld].Modified; posOld++) countOld += chunksOld[posOld].Size;
for (; posNew < sizeNew && chunksNew[posNew].Modified; posNew++) countNew += chunksNew[posNew].Size;
if (countOld + countNew > 0) {
ret.Add(new Different(
countOld > 0 ? chunksOld[beginOld].Start : 0,
countOld,
countNew > 0 ? chunksNew[beginNew].Start : 0,
countNew));
if (countOld + countNew == 0) continue;
var diff = new Different(
countOld > 0 ? chunksOld[beginOld].Start : 0,
countOld,
countNew > 0 ? chunksNew[beginNew].Start : 0,
countNew);
if (last != null) {
var midSizeOld = diff.DeletedStart - last.DeletedStart - last.DeletedCount;
var midSizeNew = diff.AddedStart - last.AddedStart - last.AddedCount;
if (midSizeOld == 1 && midSizeNew == 1) {
last.DeletedCount += (1 + countOld);
last.AddedCount += (1 + countNew);
continue;
}
}
last = diff;
ret.Add(diff);
} while (posOld < sizeOld && posNew < sizeNew);
return ret;