On Sep 22, 2016, at 6:04 AM, John Brownie <john_brow...@sil.org> wrote:
> I find that I am in need of dealing with versions of strings that may be
> turned into file names, and thus I need to be comparing normalised forms.
> However, according to
> https://developer.apple.com/library/content/qa/qa1173/_index.html, "For
> example, HFS Plus (Mac OS Extended) uses a variant of Normal Form D in which
> U+2000 through U+2FFF, U+F900 through U+FAFF, and U+2F800 through U+2FAFF are
> not decomposed (this avoids problems with round trip conversions from old Mac
> text encodings)."
> Is there a way to get at this variant? [NSString
> decomposedStringWithCanonicalMapping] returns "A string made by normalizing
> the string’s contents using the Unicode Normalization Form D." That seems not
> to give what I need, but I haven't seen a better option. Is there such a
Without undermining Alastair's recommendations, you can achieve what you want
by round-tripping the string through -[NSString fileSystemRepresentation] and
-[NSFileManager stringWithFileSystemRepresentation:length:]. That handles the
normalization, but it doesn't do anything about characters that aren't legal in
file names on a given file system.
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