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// Copyright 2010 Todd Ditchendorf
//
// 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 "PKExclusion.h"
#import <ParseKit/PKAssembly.h>
#import "NSMutableSet+ParseKitAdditions.h"
@interface PKParser ()
- (NSSet *)matchAndAssemble:(NSSet *)inAssemblies;
- (NSSet *)allMatchesFor:(NSSet *)inAssemblies;
@end
@implementation PKExclusion
+ (PKExclusion *)exclusion {
return [[[self alloc] init] autorelease];
}
- (NSSet *)allMatchesFor:(NSSet *)inAssemblies {
NSParameterAssert(inAssemblies);
NSMutableSet *outAssemblies = [NSMutableSet set];
NSInteger i = 0;
for (PKParser *p in subparsers) {
if (0 == i++) {
outAssemblies = [[[p matchAndAssemble:inAssemblies] mutableCopy] autorelease];
} else {
[outAssemblies exclusiveSetTestingEquality:[p allMatchesFor:inAssemblies]];
}
}
return outAssemblies;
}
@end