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Re: Unicode support [message #180992 is a reply to message #180981]

Sun, 31 March 2013 12:10

M. Strobel
Messages: 386
Registered: December 2011

Karma:

Senior Member

Am 30.03.2013 19:04, schrieb The Natural Philosopher:
> On 30/03/13 14:55, Christoph Becker wrote:
>> The Natural Philosopher wrote:
>>
>>> On 30/03/13 13:25, Thomas 'PointedEars' Lahn wrote:
>>>
>>>> The same issue exists with characters outside the BMP in ECMAScript
>>>> implementations which uses 16-bit characters (usually one UTF-16 code
>>>> unit
>>>> per character). But you can work around that rather efficiently.
>>>>
>>>
>>> The problem become 'what do you mean by strlen()' - the space the
>>> characters will occupy in an constant width font, or the storage
>>> allocated to the string?
>>>
>>> Mostly we are concerned with the latter.
>>
>> I am more concerned about the number of characters the string holds.
>> Say, I want to get the last character:
>>
>> $str = '€';
>> echo $str[2];
>>
>>> Because lack of precision in font reproduction, or even in guaranteeing
>>> which font may be selected, renders the former an 'open' question.
>>>
>>> strlen('€')===3 is in fact the correct answer.
>>
>> I suppose most *higher level languages* define the length of a string as
>> the number of characters the string holds. Cf. ECMAScript's length
>> property and TCL's [string length]. Even PHP's mb_strlen() returns the
>> number of characters.
>>
>
> so what happens in a typographic ligature like 'ᴁ'?
>
> I think you are making a rod for your back here.
>
> The storage requirements are exact specific and useful.
>
> The concept of a 'character in a text string' is really not..and if you go deep into
> typography with kerning, leading,ligature and the like and the like you will
> understand why.
>

Of course you need both, the storage requirements, and direct access to characters.
Maybe programming languages should use internally full 32 bit per char, or compress
the unicode string using a good library for access.

C does not even know strings, just byte arrays

/Str.

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[Message index]

		mysql dynamic binding and pass-by-ref deprecated By: oldyork90 on Wed, 20 March 2013 03:49
		Re: mysql dynamic binding and pass-by-ref deprecated By: Jerry Stuckle on Wed, 20 March 2013 10:42
		Re: mysql dynamic binding and pass-by-ref deprecated By: oldyork90 on Wed, 20 March 2013 14:09
		Re: mysql dynamic binding and pass-by-ref deprecated By: Thomas 'PointedEars' on Wed, 20 March 2013 14:29
		Re: mysql dynamic binding and pass-by-ref deprecated By: The Cat in the Hat on Wed, 20 March 2013 21:58
		UTF-8 charset (was: mysql dynamic binding and pass-by-ref deprecated) By: Christoph Becker on Wed, 20 March 2013 22:45
		Re: UTF-8 charset (was: mysql dynamic binding and pass-by-ref deprecated) By: The Cat in the Hat on Wed, 20 March 2013 23:13
		Re: UTF-8 charset By: The Natural Philosoph on Wed, 20 March 2013 23:31
		Re: UTF-8 charset By: M. Strobel on Thu, 21 March 2013 09:11
		Re: UTF-8 charset By: adrian on Thu, 21 March 2013 14:31
		Re: UTF-8 charset By: The Natural Philosoph on Thu, 21 March 2013 16:22
		Re: UTF-8 charset By: M. Strobel on Thu, 21 March 2013 17:05
		Re: UTF-8 charset By: Thomas 'PointedEars' on Fri, 22 March 2013 00:17
		Re: UTF-8 charset By: Christoph Becker on Fri, 22 March 2013 00:55
		Unicode support (was: UTF-8 charset) By: Thomas 'PointedEars' on Fri, 22 March 2013 01:16
		Re: Unicode support By: Christoph Becker on Sat, 30 March 2013 12:57
		Re: Unicode support By: Thomas 'PointedEars' on Sat, 30 March 2013 13:25
		Re: Unicode support By: The Natural Philosoph on Sat, 30 March 2013 14:33
		Re: Unicode support By: Christoph Becker on Sat, 30 March 2013 14:55
		Re: Unicode support By: The Natural Philosoph on Sat, 30 March 2013 18:04
		Re: Unicode support By: Christoph Becker on Sat, 30 March 2013 20:26
		Re: Unicode support By: The Natural Philosoph on Sat, 30 March 2013 21:26
		Re: Unicode support By: Christoph Becker on Sat, 30 March 2013 22:14
		Re: Unicode support By: The Natural Philosoph on Sat, 30 March 2013 22:29
		Re: Unicode support By: M. Strobel on Sun, 31 March 2013 12:10
		Re: Unicode support By: The Natural Philosoph on Sun, 31 March 2013 12:41
		Re: Unicode support By: M. Strobel on Sun, 31 March 2013 17:12
		Re: Unicode support By: Thomas 'PointedEars' on Sat, 30 March 2013 19:18
		Re: Unicode support By: Christoph Becker on Sat, 30 March 2013 20:05
		Re: Unicode support By: Thomas 'PointedEars' on Sat, 30 March 2013 20:19
		Re: Unicode support By: M. Strobel on Sun, 31 March 2013 12:06
		Re: Unicode support By: M. Strobel on Tue, 02 April 2013 17:59
		Re: Unicode support By: The Natural Philosoph on Sat, 30 March 2013 14:29
		Re: UTF-8 charset By: The Natural Philosoph on Fri, 22 March 2013 10:50
		Re: UTF-8 charset By: M. Strobel on Fri, 22 March 2013 08:46
		Re: UTF-8 charset By: M. Strobel on Thu, 21 March 2013 17:36
		Re: UTF-8 charset [OT] By: adrian on Thu, 21 March 2013 18:22
		Re: UTF-8 charset [OT] By: Peter H. Coffin on Thu, 21 March 2013 20:00
		Re: UTF-8 charset [OT] By: Thomas 'PointedEars' on Fri, 22 March 2013 00:47
		Re: UTF-8 charset By: The Natural Philosoph on Wed, 20 March 2013 23:20
		Re: UTF-8 charset By: Scott Johnson on Wed, 20 March 2013 23:39
		Re: mysql dynamic binding and pass-by-ref deprecated By: Jerry Stuckle on Thu, 21 March 2013 03:29
		OT: Xnews mime-proxy (was: mysql dynamic binding and pass-by-ref deprecated) By: BootNic on Thu, 21 March 2013 14:53
		Re: mysql dynamic binding and pass-by-ref deprecated By: oldyork90 on Thu, 21 March 2013 13:43

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