From: luigi scarso <luigi.scarso@gmail.com>
To: mailing list for ConTeXt users <ntg-context@ntg.nl>
Subject: Re: What do \start and \stop mean?
Date: Mon, 30 Sep 2013 18:00:23 +0200 [thread overview]
Message-ID: <CAG5iGsAThFhCArjEfaA4DWY7QThnK+iAR2PFDHaXBzMVvkcm3g@mail.gmail.com> (raw)
In-Reply-To: <52499ADB.6080802@sil.org>
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On Mon, Sep 30, 2013 at 5:38 PM, Lars Huttar <lars_huttar@sil.org> wrote:
> I found \start and \stop referenced in the context reference manual
> (e.g. section 5.5).
> While \startXYZ - \stopXYZ pairs are discussed earlier, I can't find any
> place that \start and \stop (with no suffix) are described.
> They seem to be used like \bgroup and \egroup. Is that right?
> They are defined in core-sys.mkiv, but I can't figure out from there
> what they actually do.
>
> I'll contribute documentation for them if someone can tell me what they
> mean.
>
> Thanks,
> Lars
>
core-sys.mkiv :
\unexpanded\def\start
{\dosingleempty\syst_start}
\def\syst_start
{\bgroup
\iffirstargument
\expandafter\syst_start_yes
\else
\expandafter\syst_start_nop
\fi}
\def\syst_start_yes[#1]%
{\edef\m_syst_start_stop{#1}%
\ifx\m_syst_start_stop\empty
\let\syst_stop_indeed\donothing
\else\ifcsname\e!start\m_syst_start_stop\endcsname
\expandafter\let\expandafter\syst_stop_indeed\csname\e!stop\m_syst_start_stop\endcsname
\csname\e!start\m_syst_start_stop\expandafter\expandafter\expandafter\endcsname
\else
\let\syst_stop_indeed\donothing
\fi\fi}
\def\syst_start_nop[#1]%
{\let\syst_stop_indeed\donothing}
\unexpanded\def\stop
{\syst_stop_indeed
\egroup}
(it should be \let\donothing\empty)
--
luigi
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next prev parent reply other threads:[~2013-09-30 16:00 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-09-30 15:38 Lars Huttar
2013-09-30 15:44 ` Aditya Mahajan
2013-09-30 17:53 ` Lars Huttar
2013-09-30 16:00 ` luigi scarso [this message]
2013-09-30 16:32 ` luigi scarso
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