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Re: char-whitespace?



(continued) as opposed tab, which is commonly presumed to be advance to
the next natural vertical character position representing at least one
equivalent space, as defined by either the application and or platform
default.

(over all, it's interesting that possibly in lieu of worrying about any
specific character-sets, it may be more productive to define the presumed
display semantics of a more abstract language/platform dependant
character-set, which may express itself differently based on the target
language and platform conventions of the text it composes, rather than
trying to worry about how to deal with N potentially different
representations of a particular character may exist in different language
texts; for example although Chinese is displayed vertically, tab for example
is always presumed to have the same relative semantics, or if the letter z
is typically displayed differently in Slavic languages, it is presumed to do
so based on whatever that languages conventions are (although I confess to
not being familiar with it's implied complexities, it feels more productive
than placing the responsibility for the idiosyncrasies of an arbitrary
language/platform on the programmer).

-paul-

> From: Paul Schlie <schlie@xxxxxxxxxxx>
> Date: Sun, 15 Feb 2004 17:23:37 -0500
> To: <srfi-52@xxxxxxxxxxxxxxxxx>
> Subject: Re: char-whitespace?
> Resent-From: srfi-52@xxxxxxxxxxxxxxxxx
> Resent-Date: Sun, 15 Feb 2004 23:23:48 +0100 (NFT)
> 
> Actually surprised to here that, as with the exception of tab, I perceive
> the remaining control characters to have no common semantics, other than
> being used by various platforms as being being semantically equivalent to
> newline; and correspondingly perceive newline not to be literal character,
> but an abstraction for the end-of-line sequence as presumed by various
> different platforms, which is how it's historically been treated.
> 
>> From: bear <bear@xxxxxxxxx>
>> Date: Sun, 15 Feb 2004 13:40:17 -0800 (PST)
>> To: Ken Dickey <Ken.Dickey@xxxxxxxxxxxxxx>
>> Cc: srfi-52@xxxxxxxxxxxxxxxxx
>> Subject: Re: char-whitespace?
>> Resent-From: srfi-52@xxxxxxxxxxxxxxxxx
>> Resent-Date: Sun, 15 Feb 2004 22:40:28 +0100 (NFT)
>> 
>> On Sat, 14 Feb 2004, Ken Dickey wrote:
>> 
>>> I just noted that Tab, Form Feed, Line Feed, and Carriage Return have
>>> Unicode
>>> class Cc [Control Code] and are not in Zs (Separator, space) or Zl
>>> (Separator, line).
>>> 
>>> I suspect the char-whitespace? definition should include them.
>> 
>> agreed.
>> 
>> Bear
>> 
>