Collecting command arguments in a startstop environment
There's a nice little problem that arises in LaTeX, of wanting to write a bit of code like the following, to define an environment that passes the contents of the environment to a command as an argument: \newcommand{\foo}[1]{...} \newenvironment{fooenv}{% \foo\bgroup }{% \egroup } There's even a nice FAQ entry about this. [1] As it turns out, the amsmath package defines a handy \collect@body command that handles collecting the environment body to pass it to a command. Anyhow, I'm finding myself wanting to do this in ConTeXt, with of course replacing \newenvironment with \definestartstop. Is there by any chance a built-in ConTeXt macro that can do this? Or even things that would make a decent foundation for building such a thing? Thanks much, - Brooks [1] http://www.tex.ac.uk/cgi-bin/texfaq2html?label=cmdasenv
[...]
Anyhow, I'm finding myself wanting to do this in ConTeXt, with of course replacing \newenvironment with \definestartstop.
I didn't want to fiddle with \definestartstop, but here is a quick hack: -------------------------------------------------- \long\def\foo#1{ Hello #1!} \long\def\startfoo #1 \stopfoo{\unskip \foo{#1}} \starttext \startfoo World \stopfoo \startfoo Brooks \stopfoo \startfoo some lines \stopfoo \stoptext -------------------------------------------------- Patrick -- ConTeXt wiki: http://contextgarden.net texshow-web: http://texshow.contextgarden.net List archive: http://archive.contextgarden.net
At 01:37 AM 8/2/2004, you wrote:
Anyhow, I'm finding myself wanting to do this in ConTeXt, with of course replacing \newenvironment with \definestartstop.
I didn't want to fiddle with \definestartstop, but here is a quick hack:
-------------------------------------------------- \long\def\foo#1{ Hello #1!} \long\def\startfoo #1 \stopfoo{\unskip \foo{#1}} [...]
Oh, that's clever. I'll have to ponder at whether it's got some drawbacks that mean it doesn't work for what I need, but it does seem promising. Thanks! - Brooks
To answer my own question: At 10:39 PM 8/1/2004, I wrote:
There's a nice little problem that arises in LaTeX, of wanting to write a bit of code like the following, to define an environment that passes the contents of the environment to a command as an argument:
\newcommand{\foo}[1]{...} \newenvironment{fooenv}{% \foo\bgroup }{% \egroup }
There's even a nice FAQ entry about this. [1] As it turns out, the amsmath package defines a handy \collect@body command that handles collecting the environment body to pass it to a command.
Anyhow, I'm finding myself wanting to do this in ConTeXt, with of course replacing \newenvironment with \definestartstop. Is there by any chance a built-in ConTeXt macro that can do this? Or even things that would make a decent foundation for building such a thing?
The \grabuntil and \processbetween commands, as defined in syst-ext.tex, do exactly what I'm asking for. - Brooks
Brooks Moses wrote:
To answer my own question:
At 10:39 PM 8/1/2004, I wrote:
There's a nice little problem that arises in LaTeX, of wanting to write a bit of code like the following, to define an environment that passes the contents of the environment to a command as an argument:
\newcommand{\foo}[1]{...} \newenvironment{fooenv}{% \foo\bgroup }{% \egroup }
There's even a nice FAQ entry about this. [1] As it turns out, the amsmath package defines a handy \collect@body command that handles collecting the environment body to pass it to a command.
Anyhow, I'm finding myself wanting to do this in ConTeXt, with of course replacing \newenvironment with \definestartstop. Is there by any chance a built-in ConTeXt macro that can do this? Or even things that would make a decent foundation for building such a thing?
The \grabuntil and \processbetween commands, as defined in syst-ext.tex, do exactly what I'm asking for.
If you want to play with low level features, it makes sense to look into: syst-gen.tex syst-ext.tex (syst-new.tex) supp-box.tex supp-fun.tex the interfaces of syst/supp modules are sort of 'public' and stable. These modules may also teach some tex tricks -) Hans ----------------------------------------------------------------- Hans Hagen | PRAGMA ADE Ridderstraat 27 | 8061 GH Hasselt | The Netherlands tel: 038 477 53 69 | fax: 038 477 53 74 | www.pragma-ade.com | www.pragma-pod.nl -----------------------------------------------------------------
participants (3)
-
Brooks Moses -
Hans Hagen Outside -
Patrick Gundlach