Easy way to split strings like ThisIsCamelCase?

[detz]

Is there a quick way I can split that up?

[ChrisBrightwell]

Is there a quick way I can split that up?

Scan for capital letters.

[bilboa]

NSString *str = @"ThisIsCamelCase";
NSCharacterSet *cs = [NSCharacterSet uppercaseLetterCharacterSet];
NSArray *words = [str componentsSeparatedByCharactersInSet:cs];

This almost does what you want. The problem with it is that [NSString componentsSeparatedByCharactersInSet:] removes the separator characters from the result, so you end up with ("is", "s", "amel", "ase"). So you just need to write a version of componentsSeparatedByCharactersInSet: which doesn't remove the separator characters. Since I'm bored I wrote the function. Note that this code ignores the possibility of composed characters.


NSArray *splitCamelCaseString(NSString *str)
{
NSCharacterSet *cs = [NSCharacterSet uppercaseLetterCharacterSet];
NSMutableArray *result = [[NSMutableArray new] autorelease];
if ([str length] == 0)
return result;

NSRange wordMatch, endMatch;
wordMatch.location = 0;
endMatch = [str rangeOfCharacterFromSet:cs
options:0
range:NSMakeRange(1, [str length] - 1)];
while (endMatch.location != NSNotFound) {
wordMatch.length = endMatch.location - wordMatch.location;
[result addObject:[str substringWithRange:wordMatch]];
wordMatch.location = endMatch.location;
endMatch = [str rangeOfCharacterFromSet:cs
options:0
range:NSMakeRange(wordMatch.location + 1,
[str length] - wordMatch.location - 1)];
}

// add last word
wordMatch.length = [str length] - wordMatch.location;
[result addObject:[str substringWithRange:wordMatch]];
return result;
}

[detz]

Works great, thanks man.