Sha256: 17274ea48128487aaa1d880675602e81a87fa3ad7e6ff72b7b50c4249b810a27
Contents?: true
Size: 2 KB
Versions: 29
Compression:
Stored size: 2 KB
Contents
#import "RNATranscriptionExample.h"
@implementation RNATranscription
- (NSString *)rnaFromDNAStrand:(NSString *)dnaStrand
{
NSDictionary *dnaToRNADict = @{ @"G" : @"C",
@"C" : @"G",
@"T" : @"A",
@"A" : @"U" };
NSArray *dnaKeys = [dnaToRNADict allKeys];
NSString *dnaKeyString = [dnaKeys componentsJoinedByString:@""];
NSCharacterSet *invertedSet = [[NSCharacterSet characterSetWithCharactersInString:dnaKeyString] invertedSet];
NSRange invertedSetRange = [dnaStrand rangeOfCharacterFromSet:invertedSet];
if (invertedSetRange.location != NSNotFound) {
return nil;
}
NSMutableString *rna = [NSMutableString stringWithString:dnaStrand];
NSMutableDictionary *dnaToRnaRanges = [NSMutableDictionary dictionary];
[[dnaToRNADict allKeys] enumerateObjectsUsingBlock:^(NSString *dnaKey, NSUInteger idx, BOOL * _Nonnull stop) {
NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:dnaKey options:0 error:NULL];
NSMutableArray *ranges = [NSMutableArray array];
[regex enumerateMatchesInString:dnaStrand options:0 range:NSMakeRange(0, [dnaStrand length]) usingBlock:^(NSTextCheckingResult * _Nullable match, NSMatchingFlags flags, BOOL * _Nonnull stop) {
NSRange range = [match rangeAtIndex:0];
[ranges addObject:[NSValue valueWithRange:range]];
}];
dnaToRnaRanges[dnaKey] = [ranges copy];
}];
[dnaToRNADict enumerateKeysAndObjectsUsingBlock:^(NSString *dnaKey, NSString *rnaValue, BOOL * _Nonnull stop) {
NSArray *dnaRanges = dnaToRnaRanges[dnaKey];
[dnaRanges enumerateObjectsUsingBlock:^(NSValue *dnaRangeValue, NSUInteger idx, BOOL * _Nonnull stop) {
[rna replaceOccurrencesOfString:dnaKey withString:rnaValue options:NSLiteralSearch range:[dnaRangeValue rangeValue]];
}];
}];
return [rna copy];
}
@end
Version data entries
29 entries across 29 versions & 1 rubygems