NSCharacterSet+NewlineAddition.m

//
//  NSCharacterSet+NewlineAddition.m
//  SelfControl
//
//  Created by Charlie Stigler on 4/2/09.
//  Copyright 2009 Eyebeam. 

// This file is part of SelfControl.
// 
// SelfControl is free software:  you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of 
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

#import "NSCharacterSet+NewlineAddition.h"

@implementation NSCharacterSet (NewlineAddition)

+ (NSCharacterSet*)newlineCharacterSet {
  static NSCharacterSet *newlineCharacterSet = nil;
  if (newlineCharacterSet == nil) {
    NSMutableCharacterSet *tmpSet = [[NSCharacterSet whitespaceCharacterSet] mutableCopy];
    [tmpSet invert];
    [tmpSet formIntersectionWithCharacterSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
    newlineCharacterSet = [tmpSet copy];
    [tmpSet release];
  }
  return newlineCharacterSet;
}

@end