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PKNegation.m
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PKNegation.m
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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 "PKNegation.h"
#import <ParseKit/PKAny.h>
#import <ParseKit/PKDifference.h>
@interface PKParser ()
- (NSSet *)matchAndAssemble:(NSSet *)inAssemblies;
- (NSSet *)allMatchesFor:(NSSet *)inAssemblies;
@end
@interface PKNegation ()
@property (nonatomic, retain, readwrite) PKParser *subparser;
@property (nonatomic, retain) PKParser *difference;
@end
@implementation PKNegation
+ (PKNegation *)negationWithSubparser:(PKParser *)s {
return [[[self alloc] initWithSubparser:s] autorelease];
}
- (id)initWithSubparser:(PKParser *)s {
if (self = [super init]) {
self.subparser = s;
self.difference = [PKDifference differenceWithSubparser:[PKAny any] minus:subparser];
}
return self;
}
- (void)dealloc {
self.subparser = nil;
self.difference = nil;
[super dealloc];
}
- (PKParser *)parserNamed:(NSString *)s {
if ([name isEqualToString:s]) {
return self;
} else {
return [subparser parserNamed:s];
}
}
- (NSSet *)allMatchesFor:(NSSet *)inAssemblies {
NSParameterAssert(inAssemblies);
return [difference allMatchesFor:inAssemblies];
}
@synthesize subparser;
@synthesize difference;
@end