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111 lines
3.3 KiB
Objective-C
111 lines
3.3 KiB
Objective-C
//
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// NSIndexSet+ASHelpers.m
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// Texture
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//
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// Copyright (c) 2014-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under the BSD-style license found in the
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// LICENSE file in the /ASDK-Licenses directory of this source tree. An additional
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// grant of patent rights can be found in the PATENTS file in the same directory.
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//
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// Modifications to this file made after 4/13/2017 are: Copyright (c) 2017-present,
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// Pinterest, Inc. Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// UIKit indexPath helpers
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#import <UIKit/UIKit.h>
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#import <AsyncDisplayKit/NSIndexSet+ASHelpers.h>
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@implementation NSIndexSet (ASHelpers)
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- (NSIndexSet *)as_indexesByMapping:(NSUInteger (^)(NSUInteger))block
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{
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NSMutableIndexSet *result = [NSMutableIndexSet indexSet];
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[self enumerateRangesUsingBlock:^(NSRange range, BOOL * _Nonnull stop) {
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for (NSUInteger i = range.location; i < NSMaxRange(range); i++) {
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NSUInteger newIndex = block(i);
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if (newIndex != NSNotFound) {
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[result addIndex:newIndex];
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}
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}
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}];
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return result;
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}
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- (NSIndexSet *)as_intersectionWithIndexes:(NSIndexSet *)indexes
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{
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NSMutableIndexSet *result = [NSMutableIndexSet indexSet];
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[self enumerateRangesUsingBlock:^(NSRange range, BOOL * _Nonnull stop) {
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[indexes enumerateRangesInRange:range options:kNilOptions usingBlock:^(NSRange range, BOOL * _Nonnull stop) {
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[result addIndexesInRange:range];
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}];
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}];
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return result;
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}
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+ (NSIndexSet *)as_indexSetFromIndexPaths:(NSArray<NSIndexPath *> *)indexPaths inSection:(NSUInteger)section
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{
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NSMutableIndexSet *result = [NSMutableIndexSet indexSet];
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for (NSIndexPath *indexPath in indexPaths) {
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if (indexPath.section == section) {
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[result addIndex:indexPath.item];
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}
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}
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return result;
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}
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- (NSUInteger)as_indexChangeByInsertingItemsBelowIndex:(NSUInteger)index
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{
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__block NSUInteger newIndex = index;
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[self enumerateRangesUsingBlock:^(NSRange range, BOOL * _Nonnull stop) {
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for (NSUInteger i = range.location; i < NSMaxRange(range); i++) {
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if (i <= newIndex) {
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newIndex += 1;
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} else {
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*stop = YES;
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}
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}
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}];
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return newIndex - index;
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}
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- (NSString *)as_smallDescription
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{
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NSMutableString *result = [NSMutableString stringWithString:@"{ "];
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[self enumerateRangesUsingBlock:^(NSRange range, BOOL * _Nonnull stop) {
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if (range.length == 1) {
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[result appendFormat:@"%tu ", range.location];
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} else {
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[result appendFormat:@"%tu-%tu ", range.location, NSMaxRange(range) - 1];
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}
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}];
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[result appendString:@"}"];
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return result;
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}
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+ (NSIndexSet *)as_sectionsFromIndexPaths:(NSArray<NSIndexPath *> *)indexPaths
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{
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NSMutableIndexSet *result = [NSMutableIndexSet indexSet];
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for (NSIndexPath *indexPath in indexPaths) {
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[result addIndex:indexPath.section];
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}
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return result;
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}
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- (NSArray<NSIndexPath *> *)as_filterIndexPathsBySection:(id<NSFastEnumeration>)indexPaths
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{
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NSMutableArray *result = [NSMutableArray array];
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for (NSIndexPath *indexPath in indexPaths) {
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if ([self containsIndex:indexPath.section]) {
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[result addObject:indexPath];
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}
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}
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return result;
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}
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@end
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