Sha256: 6769fcb88ae31fef6b81519e647fb5eea9ef77395fd8ee5a0d474e0e1b4c98b5
Contents?: true
Size: 1.74 KB
Versions: 80
Compression:
Stored size: 1.74 KB
Contents
#import "AtbashCipherExample.h"
static NSDictionary<NSString *, NSString *> *cipherDictionary;
@implementation AtbashCipher
+ (void)initialize {
if (self == [AtbashCipher class]) {
cipherDictionary = [self createCipherDictionary];
}
}
+ (NSDictionary<NSString *, NSString *> *)createCipherDictionary {
NSArray<NSString *> *alphabet = @[@"a", @"b", @"c", @"d", @"e", @"f", @"g", @"h", @"i", @"j", @"k", @"l", @"m", @"n", @"o", @"p", @"q", @"r", @"s", @"t", @"u", @"v", @"w", @"x", @"y", @"z"];
NSMutableDictionary<NSString *, NSString *> *cipherDict = [[NSMutableDictionary alloc] initWithCapacity:26];
NSUInteger count = alphabet.count;
for (int i = 0; i < count; i++) {
NSString *key = alphabet[i];
NSString *value = alphabet[count - i - 1];
cipherDict[key] = value;
}
return cipherDict;
}
+ (NSString *)encode:(NSString *)input {
input = [input lowercaseString];
NSCharacterSet *characterSet = [NSCharacterSet alphanumericCharacterSet];
NSMutableString *result = [[NSMutableString alloc] init];
int count = 0;
for (int i = 0; i < input.length; i++) {
unichar character = [input characterAtIndex:i];
if (![characterSet characterIsMember:character]) {
continue;
}
if (count % 5 == 0 && count > 0) {
[result appendString:@" "];
}
NSString *string = [NSString stringWithFormat:@"%C", character];
NSString *resultLetter = cipherDictionary[string];
if (resultLetter) {
[result appendString:resultLetter];
} else {
[result appendString:string];
}
count++;
}
return result;
}
@end
Version data entries
80 entries across 80 versions & 1 rubygems