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Add LCS diffing support to NSArray

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This commit is contained in:
Levi McCallum
2016-01-29 12:04:54 -08:00
parent 29609bfe87
commit 822fc96f96
3 changed files with 93 additions and 0 deletions
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8
AsyncDisplayKit.xcodeproj/project.pbxproj
View File

@@ -475,6 +475,8 @@
D785F6621A74327E00291744 /* ASScrollNode.h in Headers */ = {isa = PBXBuildFile; fileRef = D785F6601A74327E00291744 /* ASScrollNode.h */; settings = {ATTRIBUTES = (Public, ); }; };
D785F6631A74327E00291744 /* ASScrollNode.m in Sources */ = {isa = PBXBuildFile; fileRef = D785F6611A74327E00291744 /* ASScrollNode.m */; };
DB7121BCD50849C498C886FB /* libPods-AsyncDisplayKitTests.a in Frameworks */ = {isa = PBXBuildFile; fileRef = EFA731F0396842FF8AB635EE /* libPods-AsyncDisplayKitTests.a */; };
DBC452DB1C5BF64600B16017 /* NSArray+Diffing.h in Headers */ = {isa = PBXBuildFile; fileRef = DBC452D91C5BF64600B16017 /* NSArray+Diffing.h */; };
DBC452DC1C5BF64600B16017 /* NSArray+Diffing.m in Sources */ = {isa = PBXBuildFile; fileRef = DBC452DA1C5BF64600B16017 /* NSArray+Diffing.m */; };
DE040EF91C2B40AC004692FF /* ASCollectionViewFlowLayoutInspector.h in Headers */ = {isa = PBXBuildFile; fileRef = 251B8EF41BBB3D690087C538 /* ASCollectionViewFlowLayoutInspector.h */; settings = {ATTRIBUTES = (Public, ); }; };
DE0702FC1C3671E900D7DE62 /* libAsyncDisplayKit.a in Frameworks */ = {isa = PBXBuildFile; fileRef = 058D09AC195D04C000B7D73C /* libAsyncDisplayKit.a */; };
DE6EA3221C14000600183B10 /* ASDisplayNode+FrameworkPrivate.h in Headers */ = {isa = PBXBuildFile; fileRef = DE6EA3211C14000600183B10 /* ASDisplayNode+FrameworkPrivate.h */; };
@@ -802,6 +804,8 @@
D3779BCFF841AD3EB56537ED /* Pods-AsyncDisplayKitTests.release.xcconfig */ = {isa = PBXFileReference; includeInIndex = 1; lastKnownFileType = text.xcconfig; name = "Pods-AsyncDisplayKitTests.release.xcconfig"; path = "Pods/Target Support Files/Pods-AsyncDisplayKitTests/Pods-AsyncDisplayKitTests.release.xcconfig"; sourceTree = "<group>"; };
D785F6601A74327E00291744 /* ASScrollNode.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = ASScrollNode.h; sourceTree = "<group>"; };
D785F6611A74327E00291744 /* ASScrollNode.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = ASScrollNode.m; sourceTree = "<group>"; };
DBC452D91C5BF64600B16017 /* NSArray+Diffing.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = "NSArray+Diffing.h"; sourceTree = "<group>"; };
DBC452DA1C5BF64600B16017 /* NSArray+Diffing.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = "NSArray+Diffing.m"; sourceTree = "<group>"; };
DE6EA3211C14000600183B10 /* ASDisplayNode+FrameworkPrivate.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = "ASDisplayNode+FrameworkPrivate.h"; sourceTree = "<group>"; };
DE8BEABF1C2DF3FC00D57C12 /* ASDelegateProxy.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = ASDelegateProxy.h; sourceTree = "<group>"; };
DE8BEAC01C2DF3FC00D57C12 /* ASDelegateProxy.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = ASDelegateProxy.m; sourceTree = "<group>"; };
@@ -1164,6 +1168,8 @@
0442850C1BAA64EC00D16268 /* ASMultidimensionalArrayUtils.mm */,
AEB7B0181C5962EA00662EF4 /* ASDefaultPlayButton.h */,
AEB7B0191C5962EA00662EF4 /* ASDefaultPlayButton.m */,
DBC452D91C5BF64600B16017 /* NSArray+Diffing.h */,
DBC452DA1C5BF64600B16017 /* NSArray+Diffing.m */,
);
path = Private;
sourceTree = "<group>";
@@ -1354,6 +1360,7 @@
ACF6ED201B17843500DA7C62 /* ASDimension.h in Headers */,
058D0A78195D05F900B7D73C /* ASDisplayNode+DebugTiming.h in Headers */,
DECBD6E71BE56E1900CF4905 /* ASButtonNode.h in Headers */,
DBC452DB1C5BF64600B16017 /* NSArray+Diffing.h in Headers */,
058D0A4C195D05CB00B7D73C /* ASDisplayNode+Subclasses.h in Headers */,
258FF4271C0D152600A83844 /* ASRangeHandlerVisible.h in Headers */,
058D0A4A195D05CB00B7D73C /* ASDisplayNode.h in Headers */,
@@ -1782,6 +1789,7 @@
ACF6ED1D1B17843500DA7C62 /* ASCenterLayoutSpec.mm in Sources */,
18C2ED801B9B7DE800F627B3 /* ASCollectionNode.mm in Sources */,
92DD2FE41BF4B97E0074C9DD /* ASMapNode.mm in Sources */,
DBC452DC1C5BF64600B16017 /* NSArray+Diffing.m in Sources */,
AC3C4A521A1139C100143C57 /* ASCollectionView.mm in Sources */,
205F0E1E1B373A2C007741D0 /* ASCollectionViewLayoutController.mm in Sources */,
058D0A13195D050800B7D73C /* ASControlNode.m in Sources */,

18
AsyncDisplayKit/Private/NSArray+Diffing.h Normal file
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@@ -0,0 +1,18 @@
//
// NSArray+Diffing.h
// AsyncDisplayKit
//
// Created by Levi McCallum on 1/29/16.
// Copyright © 2016 Facebook. All rights reserved.
//
#import <Foundation/Foundation.h>
@interface NSArray (Diffing)
/**
* Uses a bottom-up memoized longest common subsequence solution to identify differences. Runs in O(mn) complexity.
*/
- (void)asdk_diffWithArray:(NSArray *)array insertions:(NSMutableIndexSet **)insertions deletions:(NSMutableIndexSet **)deletions;
@end

67
AsyncDisplayKit/Private/NSArray+Diffing.m Normal file
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@@ -0,0 +1,67 @@
//
// NSArray+Diffing.m
// AsyncDisplayKit
//
// Created by Levi McCallum on 1/29/16.
// Copyright © 2016 Facebook. All rights reserved.
//
#import "NSArray+Diffing.h"
@implementation NSArray (Diffing)
- (void)asdk_diffWithArray:(NSArray *)array insertions:(NSMutableIndexSet **)insertions deletions:(NSMutableIndexSet **)deletions
{
NSIndexSet *commonIndexes = [self _asdk_commonIndexesWithArray:array];
if (insertions) {
NSArray *commonObjects = [self objectsAtIndexes:commonIndexes];
for (NSInteger i = 0, j = 0; i < commonObjects.count || j < array.count;) {
if (i < commonObjects.count && j < array.count && [commonObjects[i] isEqual:array[j]]) {
i++; j++;
} else {
[*insertions addIndex:j];
j++;
}
}
}
if (deletions) {
for (NSInteger i = 0; i < self.count; i++) {
if (![commonIndexes containsIndex:i]) {
[*deletions addIndex:i];
}
}
}
}
- (NSIndexSet *)_asdk_commonIndexesWithArray:(NSArray *)array
{
NSInteger lengths[self.count+1][array.count+1];
for (NSInteger i = self.count; i >= 0; i--) {
for (NSInteger j = array.count; j >= 0; j--) {
if (i == self.count || j == array.count) {
lengths[i][j] = 0;
} else if ([self[i] isEqual:array[j]]) {
lengths[i][j] = 1 + lengths[i+1][j+1];
} else {
lengths[i][j] = MAX(lengths[i+1][j], lengths[i][j+1]);
}
}
}
NSMutableIndexSet *common = [NSMutableIndexSet indexSet];
for (NSInteger i = 0, j = 0; i < self.count && j < array.count;) {
if ([self[i] isEqual:array[j]]) {
[common addIndex:i];
i++; j++;
} else if (lengths[i+1][j] >= lengths[i][j+1]) {
i++;
} else {
j++;
}
}
return common;
}
@end