> On Sep 28, 2016, at 9:57 PM, Erica Sadun via swift-evolution
> <swift-evolution@swift.org> wrote:
>
> D'erp. I missed that. And that's an unambiguous answer.
>
> So let me move on to part B of the pitch: I think CharacterSets are broken.
>
>> Xiaodi Wu: "isn't the problem you're presenting really an argument that the
>> type should be fleshed out to handle characters (grapheme clusters)
>> containing more than one Unicode scalar?"
It seems that it already does handle such characters:
(done in Objective-C so we can log the length of the range as a count of UTF-16
code units)
#import <Foundation/Foundation.h>
int main(int argc, char *argv[]) {
@autoreleasepool {
NSCharacterSet *bikeSet = [NSCharacterSet
characterSetWithCharactersInString:@"🚲"];
NSString *str = @"foo🚲bar";
NSRange range = [str rangeOfCharacterFromSet:bikeSet];
NSLog(@"location: %lu length: %lu", range.location, range.length);
}
}
- - - - - - -
2016-09-28 22:20:00.622471 test[15577:2433912] location: 3 length: 2
Program ended with exit code: 0
- - - - - - -
As we can see, the character from the set is recognized as consisting of two
code units. There are a few bugs in the system, though. See the cocoa-dev
thread “Where is my bicycle?” from about a year ago:
http://prod.lists.apple.com/archives/cocoa-dev/2015/Apr/msg00074.html
<http://prod.lists.apple.com/archives/cocoa-dev/2015/Apr/msg00074.html>
Charles
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