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Re: rangeOfString behaves wierd
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Re: rangeOfString behaves wierd


  • Subject: Re: rangeOfString behaves wierd
  • From: "Stephen J. Butler" <email@hidden>
  • Date: Mon, 09 Dec 2013 03:43:12 -0600

OK, you are right. Copy+paste didn't preserve the compatibility character.
Does look like a bug of sorts, or at least something a unicode expert
should explain.


On Mon, Dec 9, 2013 at 3:20 AM, Gerriet M. Denkmann <email@hidden>wrote:

>
> On 9 Dec 2013, at 16:00, Stephen J. Butler <email@hidden>
> wrote:
>
> > I don't get the same result. 10.9.0, Xcode 5.0.2. I created an empty
> command line utility, copied the code, and I get NSNotFound.
> >
> > 2013-12-09 02:50:19.822 Test[73850:303] main "见≠見" (3 shorts) occurs in
> "见=見見" (4 shorts) at {9223372036854775807, 0}
>
> Copying might invoke another bug.
> Better check the characters, like:
>
> - (void)printString: (NSString *)line
> {
>         NSLog(@"%s \"%@\" has characters:",__FUNCTION__, line);
>
>         [ line  enumerateSubstringsInRange:     NSMakeRange( 0, [ line
> length ] )
>                                 options:
>                      NSStringEnumerationByComposedCharacterSequences
>                                 usingBlock: ^(NSString *currChar, NSRange
> currCharRange, NSRange enclosingRange, BOOL *stop)
>                                 {
>                                         (void)enclosingRange;
>                                         (void)stop;
>
>                                         #ifdef __LITTLE_ENDIAN__
>                                                 NSStringEncoding encoding
> = NSUTF32LittleEndianStringEncoding;
>                                         #else
>                                                 NSStringEncoding encoding
> = NSUTF32BigEndianStringEncoding;
>                                         #endif
>                                         NSData *data = [ currChar
> dataUsingEncoding: encoding ];
>
>                                         NSUInteger nbrBytes = [ data
> length ];
>                                         NSUInteger nbrChars = nbrBytes /
> sizeof(unsigned int);
>
>                                         if ( nbrChars * sizeof(unsigned
> int) != nbrBytes )      //      error
>                                         {
>                                                 NSLog(@"%s Error: strange
> nbr of bytes %lu",__FUNCTION__, nbrBytes);
>                                                 return;
>                                         };
>
>                                         unsigned int codePoint[nbrChars];
>                                         [ data getBytes: &codePoint
>  length: nbrBytes ];
>
>                                         NSMutableString *s =    [
> NSMutableString stringWithFormat: @"%@ = ",
>
>                                       NSStringFromRange(currCharRange)
>
>               ];
>                                         for( NSUInteger i = 0; i <
> nbrChars; i++ )
>                                         {
>                                                 [ s appendFormat: @"%#06x
> ", codePoint[i] ];
>                                         };
>
>                                         [ s appendFormat: @"= \"%@\"",
> currChar ];
>
>                                         fprintf(stderr, "%s\n", [ s
> UTF8String]);
>                                 }
>         ];
> }
>
> and check for:
> "见=見見" has characters:
> {0, 1} = 0x89c1 = "见"
> {1, 1} = 0x003d = "="
> {2, 1} = 0xfa0a = "見"
> {3, 1} = 0x898b = "見"
> "见≠見" has characters:
> {0, 1} = 0x89c1 = "见"
> {1, 1} = 0x2260 = "≠"
> {2, 1} = 0x898b = "見"
>
> >
> > On Mon, Dec 9, 2013 at 2:43 AM, Gerriet M. Denkmann <
> email@hidden> wrote:
> >
> > On 9 Dec 2013, at 15:05, Quincey Morris <
> email@hidden> wrote:
> >
> > > On Dec 8, 2013, at 23:46 , Gerriet M. Denkmann <email@hidden>
> wrote:
> > >
> > >> NSString *b = @"见≠見";                //      0x89c1  0x2260  0x898b
> > >
> > > So what are the results with:
> > >
> > >> NSString *b = @"见”;
> > >> NSString *b = @"≠”;
> > >> NSString *b = @"見”;
> > > ?
> > >
> > >  Does specifying an explicit locale make any difference?
> >
> > Explicit specifying en_US (as probably the best tested and debugged)
> makes no difference.
> >
>
>
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  • Follow-Ups:
    • Re: rangeOfString behaves wierd
      • From: "Stephen J. Butler" <email@hidden>
References: 
 >rangeOfString behaves wierd (From: "Gerriet M. Denkmann" <email@hidden>)
 >Re: rangeOfString behaves wierd (From: Quincey Morris <email@hidden>)
 >Re: rangeOfString behaves wierd (From: "Gerriet M. Denkmann" <email@hidden>)
 >Re: rangeOfString behaves wierd (From: "Stephen J. Butler" <email@hidden>)
 >Re: rangeOfString behaves wierd (From: "Gerriet M. Denkmann" <email@hidden>)

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