Re: Normalize an NSAttributedString
Re: Normalize an NSAttributedString
- Subject: Re: Normalize an NSAttributedString
- From: Ken Thomases <email@hidden>
- Date: Wed, 26 Aug 2009 13:59:33 -0500
On Aug 26, 2009, at 1:45 PM, Michael Ash wrote:
On Wed, Aug 26, 2009 at 1:21 PM, Ken Thomases<email@hidden>
wrote:
I'm well aware of what it means. The question is, which exact
operations on
the mutable string proxy does CFStringNormalize perform. If
CFStringNormalize performs the minimal replace operations to get
the result,
then it will preserve the attributes closely. It's conceivable,
though,
that CFStringNormalize uses a side buffer to compute the normalized
form and
then does one big replace of the whole mutable string's range. Or,
anywhere
in between. Like, it might replace a series of precomposed
characters with
their decompositions all with one replace operation. In that case,
the
attributes of most of the characters will be lost (replaced with the
attributes of the first character in the replace range).
So, it's clear that the _strings_ will always have a deterministic
value as
a result of normalization. That's the point of normalization. But
the
_attributed strings_ may not.
Fair enough. However, as Douglas pointed out, you aren't guaranteed
consistent results if you have multiple attributes within a single
decomposed character range *anyway*, so you're going to have trouble
regardless. Better to avoid that situation altogether.
My point about this lossiness has nothing to do with multiple
attributes within a single grapheme. The attributes for the entire
string may get munged.
-Ken
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