/
pathContainer.m
109 lines (87 loc) · 3.61 KB
/
pathContainer.m
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// ================================================================
// Copyright (C) 2009-2010 Tim Scheffler
//
// 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.
// ================================================================
//
// pathContainer.m
// TorchFS
//
#include "pathContainer.h"
// Originally this has been a Haskell library. This is the reason
// why the pathContainer API is somewhat less object oriented.
// Just think of a pathContainer as an opaque data type, which
// just happens to be implemented as a NSMutableDictionary.
// For now I will keep this non-OOP API, because I might switch
// back to the Haskell implementation in the future. And this
// part of TorchFS is small enough, such that its non-OOP
// character does not has too much a weight.
#pragma mark API
NSMutableDictionary *getRoot()
{
return makeDir([NSMutableArray arrayWithObject:@"/"]);
}
void addPathToDir(NSString *path, NSMutableDictionary *dir)
{
NSMutableArray *paths = [[[path pathComponents] mutableCopy] autorelease];
addPathsToDir_(paths, dir);
}
void removePathFromDir(NSString *path, NSMutableDictionary *dir)
{
NSMutableArray *paths = [[[path pathComponents] mutableCopy] autorelease];
removePathFromDir_(paths, dir);
}
NSArray *listPathInDir(NSString *path, NSMutableDictionary *dir)
{
NSMutableArray *paths = [[[path pathComponents] mutableCopy] autorelease];
return listPathsInDir_(paths, dir);
}
#pragma mark Implementation
void addPathsToDir_(NSMutableArray *pathArray, NSMutableDictionary *dir)
{
if ([pathArray count] == 0) return;
NSString *path = [pathArray objectAtIndex:0]; [pathArray removeObjectAtIndex:0];
NSMutableDictionary *subDir = [dir objectForKey:path];
if (subDir != nil)
addPathsToDir_(pathArray, subDir);
else
[dir setObject:makeDir(pathArray) forKey:path];
}
void removePathFromDir_(NSMutableArray *pathArray, NSMutableDictionary *dir)
{
if ([pathArray count] == 0) return;
NSString *path = [pathArray objectAtIndex:0]; [pathArray removeObjectAtIndex:0];
NSMutableDictionary *subDir = [dir objectForKey:path];
if (subDir != nil) {
removePathFromDir_(pathArray, subDir);
if ([[subDir allKeys] count] == 0) {
// if we deleted the subdir completely also delete it from this
// directorys key list
[dir removeObjectForKey:path];
}
} // else: do nothing. We do not have to delete a directory we cannot find!
}
NSMutableDictionary *makeDir(NSMutableArray *pathArray)
{
if ([pathArray count] == 0) return [NSMutableDictionary dictionary];
NSString *path = [pathArray objectAtIndex:0]; [pathArray removeObjectAtIndex:0];
return [NSMutableDictionary dictionaryWithObject:makeDir(pathArray) forKey:path];
}
NSArray *listPathsInDir_(NSMutableArray *pathArray, NSDictionary *dir)
{
if ([pathArray count] == 0) return [dir allKeys];
NSString *path = [pathArray objectAtIndex:0]; [pathArray removeObjectAtIndex:0];
NSDictionary *subDir = [dir objectForKey:path];
if (subDir != nil) return listPathsInDir_(pathArray, subDir);
return nil;
}