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Re: Recent history of vi

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On 2025-12-16 03:20, Waldek Hebisch wrote:
> In alt.folklore.computers Johnny Billquist <bqt@softjar.se> wrote:
> <snip>
>>> The biggest problem I have with any Unicode representation except (I
>>> think) UTF-32 is that a program has no way of knowing how long a string
>>> is without encoding/decoding it. Given a string of characters in some
>>> codepage, how many bytes does it occupy when converted to UTF-8? Given a
>>> UTF-8 character string, how many character positions does it occupy,
>>> say, for example, when displayed on a screen?
>>
>> True. However, that has nothing to do with Unicode as such, but the
>> UTF-8 encoding of it.
> 
> Unicode has combining "characters", so to know how many "real"
> character you have you need to combine.  IIUC for Korean Hangul
> character can be buit from 3 separate pieces, each taking one code
> point, but also there are "precomposed" combinations taking a
> single code point.  My reading of description is that 3 pieces
> version and precomposed one are supposed to display the same.
> 
> There are also code point for ligatures, for most puproses ligature
> fi' counts as two characters, but is a single code point.  Terminal
> may display it in a single cell, but arguably for noice monspaced
> display one should expand ligatures.  For display we have single
> cell characters and double width one, so to know width one needs
> at least table giving width of codepoint and add widths of all
> codepoints.

Excellent points.

   Johnny

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Re: Recent history of vi Johnny Billquist <bqt@softjar.se> - 2025-12-15 10:38 +0100
  Re: Recent history of vi antispam@fricas.org (Waldek Hebisch) - 2025-12-16 02:20 +0000
    Re: Recent history of vi Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-12-16 02:52 +0000
    Re: Recent history of vi Nuno Silva <nunojsilva@invalid.invalid> - 2025-12-16 11:53 +0000
      Re: Recent history of vi Richard Kettlewell <invalid@invalid.invalid> - 2025-12-16 17:42 +0000
    Re: Recent history of vi Johnny Billquist <bqt@softjar.se> - 2025-12-17 10:39 +0100
  Re: Recent history of vi "Carlos E.R." <robin_listas@es.invalid> - 2025-12-16 23:34 +0100
    Re: Recent history of vi Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-12-17 01:49 +0000

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