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Simplify usage of diffing API

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This commit is contained in:
Levi McCallum
2016-01-31 21:17:24 -08:00
parent 924e72f774
commit e852cb612c
4 changed files with 10 additions and 6 deletions
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10
AsyncDisplayKit/Private/NSArray+Diffing.m
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@@ -10,28 +10,32 @@
@implementation NSArray (Diffing)
- (void)asdk_diffWithArray:(NSArray *)array insertions:(NSMutableIndexSet **)insertions deletions:(NSMutableIndexSet **)deletions
- (void)asdk_diffWithArray:(NSArray *)array insertions:(NSIndexSet **)insertions deletions:(NSIndexSet **)deletions
{
NSIndexSet *commonIndexes = [self _asdk_commonIndexesWithArray:array];
if (insertions) {
NSArray *commonObjects = [self objectsAtIndexes:commonIndexes];
NSMutableIndexSet *insertionIndexes = [NSMutableIndexSet indexSet];
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];
[insertionIndexes addIndex:j];
j++;
}
}
*insertions = insertionIndexes;
}
if (deletions) {
NSMutableIndexSet *deletionIndexes = [NSMutableIndexSet indexSet];
for (NSInteger i = 0; i < self.count; i++) {
if (![commonIndexes containsIndex:i]) {
[*deletions addIndex:i];
[deletionIndexes addIndex:i];
}
}
*deletions = deletionIndexes;
}
}