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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 "FTree.h"
#import "FTreeNode.h"
#import "FPath.h"
#import "FUtilities.h"
@implementation FTree
@synthesize name;
@synthesize parent;
@synthesize node;
- (id)init
{
self = [super init];
if (self) {
self.name = @"";
self.parent = nil;
self.node = [[FTreeNode alloc] init];
}
return self;
}
- (id)initWithName:(NSString*)aName withParent:(FTree *)aParent withNode:(FTreeNode *)aNode
{
self = [super init];
if (self) {
self.name = aName != nil ? aName : @"";
self.parent = aParent != nil ? aParent : nil;
self.node = aNode != nil ? aNode : [[FTreeNode alloc] init];
}
return self;
}
- (FTree *) subTree:(FPath*)path {
FTree* child = self;
NSString* next = [path getFront];
while(next != nil) {
FTreeNode* childNode = child.node.children[next];
if (childNode == nil) {
childNode = [[FTreeNode alloc] init];
}
child = [[FTree alloc] initWithName:next withParent:child withNode:childNode];
path = [path popFront];
next = [path getFront];
}
return child;
}
- (id)getValue {
return self.node.value;
}
- (void)setValue:(id)value {
self.node.value = value;
[self updateParents];
}
- (void) clear {
self.node.value = nil;
[self.node.children removeAllObjects];
self.node.childCount = 0;
[self updateParents];
}
- (BOOL) hasChildren {
return self.node.childCount > 0;
}
- (BOOL) isEmpty {
return [self getValue] == nil && ![self hasChildren];
}
- (void) forEachChild:(void (^)(FTree *))action {
for(NSString* key in self.node.children) {
action([[FTree alloc] initWithName:key withParent:self withNode:[self.node.children objectForKey:key]]);
}
}
- (void) forEachChildMutationSafe:(void (^)(FTree *))action {
for(NSString* key in [self.node.children copy]) {
action([[FTree alloc] initWithName:key withParent:self withNode:[self.node.children objectForKey:key]]);
}
}
- (void) forEachDescendant:(void (^)(FTree *))action {
[self forEachDescendant:action includeSelf:NO childrenFirst:NO];
}
- (void) forEachDescendant:(void (^)(FTree *))action includeSelf:(BOOL)incSelf childrenFirst:(BOOL)childFirst {
if(incSelf && !childFirst) {
action(self);
}
[self forEachChild:^(FTree* child) {
[child forEachDescendant:action includeSelf:YES childrenFirst:childFirst];
}];
if(incSelf && childFirst) {
action(self);
}
}
- (BOOL) forEachAncestor:(BOOL (^)(FTree *))action {
return [self forEachAncestor:action includeSelf:NO];
}
- (BOOL) forEachAncestor:(BOOL (^)(FTree *))action includeSelf:(BOOL)incSelf {
FTree* aNode = (incSelf) ? self : self.parent;
while(aNode != nil) {
if(action(aNode)) {
return YES;
}
aNode = aNode.parent;
}
return NO;
}
- (void) forEachImmediateDescendantWithValue:(void (^)(FTree *))action {
[self forEachChild:^(FTree * child) {
if([child getValue] != nil) {
action(child);
}
else {
[child forEachImmediateDescendantWithValue:action];
}
}];
}
- (BOOL) valueExistsAtOrAbove:(FPath *)path {
FTreeNode* aNode = self.node;
while(aNode != nil) {
if(aNode.value != nil) {
return YES;
}
aNode = [aNode.children objectForKey:path.getFront];
path = [path popFront];
}
// XXX Check with Michael if this is correct; deviates from JS.
return NO;
}
- (FPath *)path {
return [[FPath alloc] initWith:(self.parent == nil) ? self.name :
[NSString stringWithFormat:@"%@/%@", [self.parent path], self.name ]];
}
- (void) updateParents {
[self.parent updateChild:self.name withNode:self];
}
- (void) updateChild:(NSString*)childName withNode:(FTree *)child {
BOOL childEmpty = [child isEmpty];
BOOL childExists = self.node.children[childName] != nil;
if(childEmpty && childExists) {
[self.node.children removeObjectForKey:childName];
self.node.childCount = self.node.childCount - 1;
[self updateParents];
}
else if(!childEmpty && !childExists) {
[self.node.children setObject:child.node forKey:childName];
self.node.childCount = self.node.childCount + 1;
[self updateParents];
}
}
@end
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