AKNSString+Escaping.m

//
//  AKNSString+Escaping.m
//  Telephone
//
//  Redistribution and use in source and binary forms, with or without
//  modification, are permitted provided that the following conditions are met:
//  1. Redistributions of source code must retain the above copyright notice,
//     this list of conditions and the following disclaimer.
//  2. Redistributions in binary form must reproduce the above copyright notice,
//     this list of conditions and the following disclaimer in the documentation
//     and/or other materials provided with the distribution.
//  3. Neither the name of the copyright holder nor the names of contributors
//     may be used to endorse or promote products derived from this software
//     without specific prior written permission.
//
//  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
//  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
//  THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
//  PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE THE COPYRIGHT HOLDER
//  OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
//  EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
//  PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
//  OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
//  WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
//  OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
//  ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//

#import "AKNSString+Escaping.h"


@implementation NSString (AKStringEscapingAdditions)

- (NSString *)ak_escapeFirstCharacterFromString:(NSString *)string {
  NSMutableString *newString = [NSMutableString stringWithString:self];
  NSString *escapeCharacterString
    = [string substringWithRange:NSMakeRange(0, 1)];
  NSRange escapeCharacterRange
    = [newString rangeOfString:escapeCharacterString];
  while (escapeCharacterRange.location != NSNotFound) {
    [newString insertString:@"\\" atIndex:escapeCharacterRange.location];
    NSRange searchRange;
    searchRange.location = escapeCharacterRange.location + 2;
    searchRange.length = [newString length] - searchRange.location;
    escapeCharacterRange = [newString rangeOfString:escapeCharacterString
                                            options:0
                                              range:searchRange];
  }
  
  return [[newString copy] autorelease];
}

- (NSString *)ak_escapeQuotes {
  return [self ak_escapeFirstCharacterFromString:@"\""];
}

- (NSString *)ak_escapeParentheses {
  NSString *returnString = [self ak_escapeFirstCharacterFromString:@")"];
  
  return [returnString ak_escapeFirstCharacterFromString:@"("];
}

@end