From: Peter Stephenson <p.stephenson@samsung.com>
To: Zsh hackers list <zsh-workers@zsh.org>
Subject: Re: [PATCH] Index of element after width of characters
Date: Thu, 29 Oct 2015 09:42:26 +0000 [thread overview]
Message-ID: <20151029094226.1e636040@pwslap01u.europe.root.pri> (raw)
In-Reply-To: <151028160716.ZM1300@torch.brasslantern.com>
On Wed, 28 Oct 2015 16:07:16 -0700
Bart Schaefer <schaefer@brasslantern.com> wrote:
> On Oct 28, 3:59pm, Peter Stephenson wrote:
> }
> } Mikael's right, actually --- this is an indexing problem and more
> } consistently done with subscripts. It should actually be simpler than
> } the existing code for space-delimited words in scalars.
>
> Doesn't subscripting already treat multi-byte characters as single
> positions in strings? The one strangeness may be characters that
> have zero disply width.
>
> So I take it that what we need is subscripting that counts display
> widths rather than character widths.
Yes, in MULTIBYTE mode it counts characters. It's slightly more
complicated when you take account of the width since there isn't a
one-to-one match from width-based indices to characters in the string.
In particular, if you ask for foo[1,(?)2] (with whatever character is
used for the syntax instead of "?") when the first character is width 2,
you either get nothing or a complete chracter taking you to character
position 2.
I suppose ${#foo[1,(?)2]} is an easy way to tell you how many characters
were actually included.
pws
prev parent reply other threads:[~2015-10-29 9:42 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-27 17:18 Sebastian Gniazdowski
2015-10-27 19:41 ` Mikael Magnusson
2015-10-27 19:55 ` Sebastian Gniazdowski
2015-10-27 21:20 ` Bart Schaefer
2015-10-28 7:46 ` Sebastian Gniazdowski
2015-10-28 7:54 ` Sebastian Gniazdowski
2015-10-28 11:38 ` Sebastian Gniazdowski
2015-10-28 13:31 ` Mikael Magnusson
2015-10-28 15:46 ` Sebastian Gniazdowski
2015-10-28 15:59 ` Peter Stephenson
2015-10-28 16:37 ` Sebastian Gniazdowski
2015-10-28 23:07 ` Bart Schaefer
2015-10-29 9:42 ` Peter Stephenson [this message]
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