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PKDifference.h.svn-base
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PKDifference.h.svn-base
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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 <Foundation/Foundation.h>
#import <ParseKit/PKParser.h>
/*!
@class PKDifference
@brief A <tt>PKDifference</tt> matches anything its <tt>subparser</tt> would match except for anything its <tt>minus</tt> parser would match.
@details The example below would match any <tt>Word</tt> token except for <tt>true</tt> or <tt>false</tt>.
@code
PKParser *trueParser = [PKLiteral literalWithString:@"true"];
PKParser *falseParser = [PKLiteral literalWithString:@"false"];
PKAlternation *reservedWords = [PKAlternation alternationWithSubparsers:trueParser, falseParser, nil];
PKDifference *diff = [PKDifference differenceWithSubparser:[PKWord word] minus:reservedWords];
@endcode
*/
@interface PKDifference : PKParser {
PKParser *subparser;
PKParser *minus;
}
/*!
@brief Convenience factory method for initializing an autoreleased <tt>PKDifference</tt> parser.
@param subparser the parser this parser uses for matching
@param minus the parser whose matches will be exluded
@result an initialized autoreleased <tt>PKDifference</tt> parser.
*/
+ (PKDifference *)differenceWithSubparser:(PKParser *)s minus:(PKParser *)m;
/*!
@brief Designated initializer
@param subparser the parser this parser uses for matching
@param minus the parser whose matches will be exluded
@result an initialized <tt>PKDifference</tt> parser.
*/
- (id)initWithSubparser:(PKParser *)s minus:(PKParser *)m;
/*!
@property subparser
@brief this parser's subparser which it will initially match against
*/
@property (nonatomic, retain, readonly) PKParser *subparser;
/*!
@property minus
@brief after a successful match against <tt>subparser</tt>, matches against <tt>minus</tt> will not be matched by this parser
*/
@property (nonatomic, retain, readonly) PKParser *minus;
@end