Do environment files add implicit \starttext ... \stopttext

Do environment files add implicit \starttext ... \stopttext

[Denis Maier via ntg-context]

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Hi,

if I process an XML buffer, I've noticed I need to wrap the \xmlprocessbuffer in a \starttext ... \stoptext pair.

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\startbuffer[test]
<?xml version='1.0' standalone='yes?>
<document>
<p>a paragraph of text</p>
<p>another paragraph of text</p>
</document>
\stopbuffer

\startxmlsetups xml:demo
\xmlsetsetup{\xmldocument}{document|p}{xml:*}
\stopxmlsetups

\xmlregistersetup{xml:demo}

\startxmlsetups xml:document
  \xmlflush{#1}
\stopxmlsetups

\startxmlsetups xml:p
  \xmlflush{#1}\endgraf
\stopxmlsetups

\starttext
  \xmlprocessbuffer{test}{test}{}
\stoptext
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

However, if I have the XML and the setups in dedicated files, there seems to be no need for \starttext ... \stoptext.

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% text.xml
<?xml version='1.0' standalone='yes?>
<document>
<p>a paragraph of text</p>
<p>another paragraph of text</p>
</document>
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% setups.tex
\startxmlsetups xml:demo
\xmlsetsetup{\xmldocument}{document|p}{xml:*}
\stopxmlsetups

\xmlregistersetup{xml:demo}

\startxmlsetups xml:document
  \xmlflush{#1}
\stopxmlsetups

\startxmlsetups xml:p
  \xmlflush{#1}\endgraf
\stopxmlsetups
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

Running
context text.xml -environment=setups.tex
gives me a proper PDF without errors.

Therefore my question:
Does the use -environment automatically wrap the processed file in \starttext ... stoptext ?

If not, what's the reason for this behaviour? Am I missing something?

Best,
Denis

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Re: Do environment files add implicit \starttext ... \stopttext

[Pablo Rodriguez via ntg-context]

On 11/15/22 13:22, Denis Maier via ntg-context wrote:
> Hi,
> 
> if I process an XML buffer, I’ve noticed I need to wrap the
> \xmlprocessbuffer in a \starttext ... \stoptext pair.
> []
> However, if I have the XML and the setups in dedicated files, there
> seems to be no need for \starttext ... \stoptext.
> [] 
> Therefore my question:
> 
> Does the use –environment automatically wrap the processed file in
> \starttext ... stoptext ?

Hi Denis,

try a source file with this contents:

  \ConTeXt\ is great.

with the following environment:

  \setuppapersize[A6]
  \setupbodyfont[pagella]

It looks like when --environment is used, ConTeXt assumes that the main
source only contains text. Which makes sense (at least, to me).

Just in case it might help,

Pablo
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Re: Do environment files add implicit \starttext ... \stopttext

[Denis Maier via ntg-context]

> -----Ursprüngliche Nachricht-----
> Von: ntg-context <ntg-context-bounces@ntg.nl> Im Auftrag von Pablo
> Rodriguez via ntg-context
> Gesendet: Dienstag, 15. November 2022 16:07
> An: Denis Maier via ntg-context <ntg-context@ntg.nl>
> Cc: Pablo Rodriguez <oinos@gmx.es>
> Betreff: Re: [NTG-context] Do environment files add implicit \starttext ...
> \stopttext
> 
> On 11/15/22 13:22, Denis Maier via ntg-context wrote:
> > Hi,
> >
> > if I process an XML buffer, I’ve noticed I need to wrap the
> > \xmlprocessbuffer in a \starttext ... \stoptext pair.
> > []
> > However, if I have the XML and the setups in dedicated files, there
> > seems to be no need for \starttext ... \stoptext.
> > []
> > Therefore my question:
> >
> > Does the use –environment automatically wrap the processed file in
> > \starttext ... stoptext ?
> 
> Hi Denis,
> 
> try a source file with this contents:
> 
>   \ConTeXt\ is great.
> 
> with the following environment:
> 
>   \setuppapersize[A6]
>   \setupbodyfont[pagella]
> 
> It looks like when --environment is used, ConTeXt assumes that the main
> source only contains text. Which makes sense (at least, to me).
> 

Thanks, Pablo. Yes, that makes sense.

Denis
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Re: Do environment files add implicit \starttext ... \stopttext

[Wolfgang Schuster via ntg-context]

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Denis Maier via ntg-context schrieb am 15.11.2022 um 13:22:
>
> Hi,
>
> if I process an XML buffer, I’ve noticed I need to wrap the 
> \xmlprocessbuffer in a \starttext ... \stoptext pair.
>
> [...]
>
> However, if I have the XML and the setups in dedicated files, there 
> seems to be no need for \starttext ... \stoptext.
>
> [...]
>
> Running
>
> context text.xml –environment=setups.tex
>
> gives me a proper PDF without errors.
>
> Therefore my question:
>
> Does the use –environment automatically wrap the processed file in 
> \starttext ... stoptext ?
>
> If not, what’s the reason for this behaviour? Am I missing something?
>

ConTeXt uses the file extension to decide who it should handle document,
in your case the extension is xml and the file is processed as

\starttext
\xmlprocess{main}{...}{}
\stoptext

The same thing happens when you have CLD document and use cld as file 
extension.

For more details you can look at the processjob function in cont-run.lmt.

Wolfgang


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Re: Do environment files add implicit \starttext ... \stopttext

[Wolfgang Schuster via ntg-context]

Pablo Rodriguez via ntg-context schrieb am 15.11.2022 um 16:06:
> On 11/15/22 13:22, Denis Maier via ntg-context wrote:
>> Hi,
>>
>> if I process an XML buffer, I’ve noticed I need to wrap the
>> \xmlprocessbuffer in a \starttext ... \stoptext pair.
>> []
>> However, if I have the XML and the setups in dedicated files, there
>> seems to be no need for \starttext ... \stoptext.
>> []
>> Therefore my question:
>>
>> Does the use –environment automatically wrap the processed file in
>> \starttext ... stoptext ?
> Hi Denis,
>
> try a source file with this contents:
>
>    \ConTeXt\ is great.
>
> with the following environment:
>
>    \setuppapersize[A6]
>    \setupbodyfont[pagella]
>
> It looks like when --environment is used, ConTeXt assumes that the main
> source only contains text. Which makes sense (at least, to me).

The reason why this does work has nothing to do with the environment 
file, the only
thing which is responsible to get a PDF with output is the 
\setupbodyfont line.


Better examples are

%%%% begin example 1
\CONTEXT\ is great.
%%%% end example 1

and

%%%% begin example 2
\setupbodyfont[modern]

\CONTEXT\ is great.
%%%% begin example 2

where the output of the first example is broken.


To ensure the document exists in a proper manner ConTeXt inserts \stoptext
at the end of the document but there is never a \starttext inserted at 
any point
when you process a regular tex file.

You should also notice a message like

     system          > invalid \starttext ... \stoptext structure

on the terminal.

Wolfgang

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Re: Do environment files add implicit \starttext ... \stopttext

[Pablo Rodriguez via ntg-context]

On 11/18/22 15:52, Wolfgang Schuster via ntg-context wrote:
> Pablo Rodriguez via ntg-context schrieb am 15.11.2022 um 16:06:
>> [...]
>> It looks like when --environment is used, ConTeXt assumes that the main
>> source only contains text. Which makes sense (at least, to me).
> 
> The reason why this does work has nothing to do with the environment
> file, the only  thing which is responsible to get a PDF with output
> is the \setupbodyfont line.

Many thanks for your explanation, Wolfgang.

Now it is perfectly clear to me why this worked.

Many thanks for your help,

Pablo
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