Environments

Environments

[Hans Aberg]

ConTeXt does not seem to have LaTeX style environments. FYI, for the latter, I developed [1] a long time ago more advanced ones:

The environments admit hooks, i.e., code executed before and after the local group. The name can be omitted in the closing, which works also when using one environment to define a new. And a more compact syntax.


1. https://secure2.storegate.com/Shares/Home.aspx?ShareID=db8465b3-112f-4194-8909-1d42ff149e32

Compile 'lualatex test0.tex’.


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Re: Environments

[luigi scarso]

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On Tue, Jul 7, 2015 at 10:49 AM, Hans Aberg <haberg-1@telia.com> wrote:

> ConTeXt does not seem to have LaTeX style environments. FYI, for the
> latter, I developed [1] a long time ago more advanced ones:
>
> The environments admit hooks, i.e., code executed before and after the
> local group. The name can be omitted in the closing, which works also when
> using one environment to define a new. And a more compact syntax.
>
>
> 1.
> https://secure2.storegate.com/Shares/Home.aspx?ShareID=db8465b3-112f-4194-8909-1d42ff149e32
>
> Compile 'lualatex test0.tex’.
>
>
>
> ___________________________________________________________________________________
> If your question is of interest to others as well, please add an entry to
> the Wiki!
>
> maillist : ntg-context@ntg.nl /
> http://www.ntg.nl/mailman/listinfo/ntg-context
> webpage  : http://www.pragma-ade.nl / http://tex.aanhet.net
> archive  : http://foundry.supelec.fr/projects/contextrev/
> wiki     : http://contextgarden.net
>
> ___________________________________________________________________________________




For  "LaTeX style environments" do you mean
e.g.
https://it.sharelatex.com/learn/Environments
?  (just to be sure )

In this case  context has the \define<something> commands as for example
http://wiki.contextgarden.net/Command/definetyping

Context has also
http://wiki.contextgarden.net/Command/startenvironment
but I suppose it's not what you mean.

-- 
luigi

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Re: Environments

[Hans Aberg]

> On 7 Jul 2015, at 11:05, luigi scarso <luigi.scarso@gmail.com> wrote:

> For  "LaTeX style environments" do you mean
> e.g.
> https://it.sharelatex.com/learn/Environments
> ?  (just to be sure )

Yes, the \begin{foo} … \end{foo} syntax. Technically, an environment means that variables are stacked in a syntactically local group, as in \begingroup … \endgroup.

The syntax in the example file is «foo· … ·» or «foo· … ·foo», so one does not have to write the ‘start' and ‘stop’ all the time, and does not have to write the name of the environment again at the end.

> In this case  context has the \define<something> commands as for example
> http://wiki.contextgarden.net/Command/definetyping

I think this corresponds (in pseudocode) to my
\new{Environment}{typing}%
  {}{<before code>}%
  {<after code>}{}

In LaTeX, if I remember correctly, it would expand to \begingroup<before code> … <after code>\endgroup.

I added so one can have 
\new{Environment}{typing}%
  {<before code>}{<begin code>}%
  {<end code>}{<after code>}
expanding to
  <before code>\begingroup<begin code> … <end code>\endgroup<after code>

So one has more control over designing the environment. One can then also define a new environment
\new{Environment}{typingmore}%
  {<code>}{<code>«typing·<args>}%
  {·typing»<code>}{<code>}
I think, to make specializations.

> Context has also 
> http://wiki.contextgarden.net/Command/startenvironment
> but I suppose it's not what you mean.

It looks like just adding a series of command names, rather than a stacked environment, or a namespace (module). If one wants to avoid name clashes, one can have names like in directory names, living without any local group.


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Re: Environments

[Manuel Blanco]

Your code in the .sty is a little bit unconventional. In any case, the
most common in LaTeX is to use etoolbox package.

    \usepackage{etoolbox}
    \newenvironment{env}{whatever goes here}{whatever goes here}
    \AtBeginEnvironment{env}{<begin environment>}
    \AtEndEnvironment{env}{<end environment>}
    \BeforeBeginEnvironment{<before environment>}
    \AfterEndEnvironment{<after environment>}
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