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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 <ParseKit/PKAlternation.h>
#import <ParseKit/PKAssembly.h>
@interface PKParser ()
- (NSSet *)matchAndAssemble:(NSSet *)inAssemblies;
- (NSSet *)allMatchesFor:(NSSet *)inAssemblies;
@end
@interface PKCollectionParser ()
+ (PKCollectionParser *)collectionParserWithFirst:(PKParser *)p1 rest:(va_list)rest;
@end
@implementation PKAlternation
+ (PKAlternation *)alternation {
return [self alternationWithSubparsers:nil];
}
+ (PKAlternation *)alternationWithSubparsers:(PKParser *)p1, ... {
va_list vargs;
va_start(vargs, p1);
PKAlternation *alt = (PKAlternation *)[self collectionParserWithFirst:p1 rest:vargs];
va_end(vargs);
return alt;
}
- (NSSet *)allMatchesFor:(NSSet *)inAssemblies {
NSParameterAssert(inAssemblies);
NSMutableSet *outAssemblies = [NSMutableSet set];
for (PKParser *p in subparsers) {
[outAssemblies unionSet:[p matchAndAssemble:inAssemblies]];
}
return outAssemblies;
}
@end
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