Re: Small patch for handling non-breaking spaces.

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On Mar 14, 2005, at 5:45 PM, Robert Menteer wrote:

>>> The patch seems logical, but I don't understand the use of \xCA's
>>> throughout it.  My understanding is that Unicode's NO-BREAK SPACE is
>>> at codepoint U+00A0, which is \xc2\xa0 using UTF-8.  What am I
>>> missing?
>>
>> I think this would be better to do with something like this:
>>
>> [NSString stringWithFormat:@"%C",0x00A0] (assuming that Mark is right
>> about the Unicode code point). The problem is I'm not sure there's any
>> way to guarantee what encoding is used when you put a hex escape into
>> an NSString constant. The %C always means provide a unichar, which is
>> unambiguous.
>>
>> I'm guessing 0xCA is the MacRoman encoding of this character.
>>
>> -Jason
>
> Let's try this one more time this time using Unicode characters.
[snip]

> +			NSString *nbsp = [[[NSString alloc] initWithBytes:"\xA0" length:1
> +						encoding: 
> CFStringConvertEncodingToNSStringEncoding(NSUTF8StringEncoding)]
> +						autorelease];

This is both overly complex and incorrect for several reasons:
   * CFStringConvertEncodingToNSStringEncoding converts a  
CFStringEncoding to a NSStringEncoding, while NSUTF8StringEncoding is  
already a NSStringEncoding.
   * You've specified the encoding as being UTF-8, while \xa0 is not a  
valid UTF-8 string.  I think you probably intended it to be \xc2\xa0.

A simpler way of writing this would be something along the lines of:

   unichar _nbsp = 0x00A0;
   NSString *nbsp = [NSString stringWithCharacters:&_nbsp length:1];


I don't have time to test this right now though, hopefully someone else  
will.

Regards,

Mark Rowe
<http://bdash.net.nz/>
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