Abizer Nasir avatar Abizer Nasir committed bddf4da

Add a length validation as well

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Files changed (2)

charsets/Validator.m

 @implementation Validator
 
 + (BOOL)isValidString:(NSString *)string {
+    // I see you also have a length validation to do as well, filter for that first
+
+    NSUInteger inputLength = [string length];
+    if (!(inputLength > 0 && inputLength <= 30)) {
+        return NO; // bail and return NO
+    }
+
+    // Create a static comparison set for performance
+    // Basically - specify the character set you want and then invert the set to get a set of characters you don't want.
     static NSCharacterSet *unwantedCharacters = nil;
     if (!unwantedCharacters) {
         unwantedCharacters = [[NSCharacterSet alphanumericCharacterSet] invertedSet];
 
     NSRange rangeOfUnwantedCharacters = [string rangeOfCharacterFromSet:unwantedCharacters];
 
+    // If any characters are found from the invalid character set, they will have a valid range.
     if (rangeOfUnwantedCharacters.location == NSNotFound) {
         return YES;
     } else {
     @autoreleasepool {
         NSString *goodString = @"abcdefghijklmnopqrstuvwxyz0123456789";
         NSString *badString = @"[this & this are wrong]";
+        NSString *tooLongString = @"abcdefghijklmnopqrstuvwxyz0123456789abcdefghijklmnopqrstuvwxyz0123456789abcdefghijklmnopqrstuvwxyz0123456789";
 
         NSLog(@"Good String is valid: %@", [Validator isValidString:goodString] ? @"YES" : @"NO");
         NSLog(@"Bad String is valid: %@", [Validator isValidString:badString] ? @"YES" : @"NO");
+        NSLog(@"Too Long String is valid: %@", [Validator isValidString:tooLongString] ? @"YES" : @"NO");
         
     }
     return 0;
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