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/*
* Copyright 2017 Google
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#import "FPruneForest.h"
#import "FImmutableTree.h"
@interface FPruneForest ()
@property (nonatomic, strong) FImmutableTree *pruneForest;
@end
@implementation FPruneForest
static BOOL (^kFPrunePredicate)(id) = ^BOOL(NSNumber *pruneValue) {
return [pruneValue boolValue];
};
static BOOL (^kFKeepPredicate)(id) = ^BOOL(NSNumber *pruneValue) {
return ![pruneValue boolValue];
};
+ (FImmutableTree *)pruneTree {
static dispatch_once_t onceToken;
static FImmutableTree *pruneTree;
dispatch_once(&onceToken, ^{
pruneTree = [[FImmutableTree alloc] initWithValue:@YES];
});
return pruneTree;
}
+ (FImmutableTree *)keepTree {
static dispatch_once_t onceToken;
static FImmutableTree *keepTree;
dispatch_once(&onceToken, ^{
keepTree = [[FImmutableTree alloc] initWithValue:@NO];
});
return keepTree;
}
- (id) initWithForest:(FImmutableTree *)tree {
self = [super init];
if (self != nil) {
self->_pruneForest = tree;
}
return self;
}
+ (FPruneForest *)empty {
static dispatch_once_t onceToken;
static FPruneForest *forest;
dispatch_once(&onceToken, ^{
forest = [[FPruneForest alloc] initWithForest:[FImmutableTree empty]];
});
return forest;
}
- (BOOL)prunesAnything {
return [self.pruneForest containsValueMatching:kFPrunePredicate];
}
- (BOOL)shouldPruneUnkeptDescendantsAtPath:(FPath *)path {
NSNumber *shouldPrune = [self.pruneForest leafMostValueOnPath:path];
return shouldPrune != nil && [shouldPrune boolValue];
}
- (BOOL)shouldKeepPath:(FPath *)path {
NSNumber *shouldPrune = [self.pruneForest leafMostValueOnPath:path];
return shouldPrune != nil && ![shouldPrune boolValue];
}
- (BOOL)affectsPath:(FPath *)path {
return [self.pruneForest rootMostValueOnPath:path] != nil || ![[self.pruneForest subtreeAtPath:path] isEmpty];
}
- (FPruneForest *)child:(NSString *)childKey {
FImmutableTree *childPruneForest = [self.pruneForest.children get:childKey];
if (childPruneForest == nil) {
if (self.pruneForest.value != nil) {
childPruneForest = [self.pruneForest.value boolValue] ? [FPruneForest pruneTree] : [FPruneForest keepTree];
} else {
childPruneForest = [FImmutableTree empty];
}
} else {
if (childPruneForest.value == nil && self.pruneForest.value != nil) {
childPruneForest = [childPruneForest setValue:self.pruneForest.value atPath:[FPath empty]];
}
}
return [[FPruneForest alloc] initWithForest:childPruneForest];
}
- (FPruneForest *)childAtPath:(FPath *)path {
if (path.isEmpty) {
return self;
} else {
return [[self child:path.getFront] childAtPath:[path popFront]];
}
}
- (FPruneForest *)prunePath:(FPath *)path {
if ([self.pruneForest rootMostValueOnPath:path matching:kFKeepPredicate]) {
[NSException raise:NSInvalidArgumentException format:@"Can't prune path that was kept previously!"];
}
if ([self.pruneForest rootMostValueOnPath:path matching:kFPrunePredicate]) {
// This path will already be pruned
return self;
} else {
FImmutableTree *newPruneForest = [self.pruneForest setTree:[FPruneForest pruneTree] atPath:path];
return [[FPruneForest alloc] initWithForest:newPruneForest];
}
}
- (FPruneForest *)keepPath:(FPath *)path {
if ([self.pruneForest rootMostValueOnPath:path matching:kFKeepPredicate]) {
// This path will already be kept
return self;
} else {
FImmutableTree *newPruneForest = [self.pruneForest setTree:[FPruneForest keepTree] atPath:path];
return [[FPruneForest alloc] initWithForest:newPruneForest];
}
}
- (FPruneForest *)keepAll:(NSSet *)children atPath:(FPath *)path {
if ([self.pruneForest rootMostValueOnPath:path matching:kFKeepPredicate]) {
// This path will already be kept
return self;
} else {
return [self setPruneValue:[FPruneForest keepTree] forAll:children atPath:path];
}
}
- (FPruneForest *)pruneAll:(NSSet *)children atPath:(FPath *)path {
if ([self.pruneForest rootMostValueOnPath:path matching:kFKeepPredicate]) {
[NSException raise:NSInvalidArgumentException format:@"Can't prune path that was kept previously!"];
}
if ([self.pruneForest rootMostValueOnPath:path matching:kFPrunePredicate]) {
// This path will already be kept
return self;
} else {
return [self setPruneValue:[FPruneForest pruneTree] forAll:children atPath:path];
}
}
- (FPruneForest *)setPruneValue:(FImmutableTree *)pruneValue forAll:(NSSet *)children atPath:(FPath *)path {
FImmutableTree *subtree = [self.pruneForest subtreeAtPath:path];
__block FImmutableSortedDictionary *childrenDictionary = subtree.children;
[children enumerateObjectsUsingBlock:^(NSString *childKey, BOOL *stop) {
childrenDictionary = [childrenDictionary insertKey:childKey withValue:pruneValue];
}];
FImmutableTree *newSubtree = [[FImmutableTree alloc] initWithValue:subtree.value children:childrenDictionary];
return [[FPruneForest alloc] initWithForest:[self.pruneForest setTree:newSubtree atPath:path]];
}
- (void)enumarateKeptNodesUsingBlock:(void (^)(FPath *))block {
[self.pruneForest forEach:^(FPath *path, id value) {
if (value != nil && ![value boolValue]) {
block(path);
}
}];
}
@end
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