\startchemical

\startchemical

[Wolfgang Schuster]

Hi,

why does \startchemical take the name of a instance as argument (e.g. 
\startchemical[important]) when
there is no way to create it because \definechemical is redefined and 
the original version isn’t saved.

Even \setupchemical[important][..,..=..,..] can’t be used because it 
doesn’t resolve the parent setting.

Wolfgang
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Re: \startchemical

[Alan BRASLAU]

On Tue, 18 Aug 2015 19:42:20 +0200
Wolfgang Schuster <schuster.wolfgang@gmail.com> wrote:

> why does \startchemical take the name of a instance as argument (e.g. 
> \startchemical[important]) when
> there is no way to create it because \definechemical is redefined and 
> the original version isn’t saved.
> 
> Even \setupchemical[important][..,..=..,..] can’t be used because it 
> doesn’t resolve the parent setting.

I did not realize that \startchemical took the name of an instance as
argument - I have only used it with key=value, i.e.:
\startchemical[...=...] 

I suppose that it uses some "standard" mechanisms.


\definechemical[benzene] is different. It gets used as:

\startchemical
    \chemical[benzene,...]
\stopchemical


Perhaps there is some inconsistency with respect to ConTeXt syntax here.

Alan
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Re: \startchemical

[Wolfgang Schuster]

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> Alan BRASLAU <mailto:alan.braslau@cea.fr>
> 18. August 2015 20:01
> On Tue, 18 Aug 2015 19:42:20 +0200
>
> I did not realize that \startchemical took the name of an instance as
> argument - I have only used it with key=value, i.e.:
> \startchemical[...=...]
>
> I suppose that it uses some "standard" mechanisms.
There are helper commands for the default \define and \setup macros
but the allowed arguments for \start... depend only on the way how
you write it.
> \definechemical[benzene] is different. It gets used as:
>
> \startchemical
> \chemical[benzene,...]
> \stopchemical
>
>
> Perhaps there is some inconsistency with respect to ConTeXt syntax here.
There are other commands which redefine the generated \define-command
but normally it is saved before the redefintion and the problem here is that
you can’t pass a instance because it can’t be created.

Wolfgang

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Re: \startchemical

[Hans Hagen]

On 8/18/2015 8:01 PM, Alan BRASLAU wrote:
> On Tue, 18 Aug 2015 19:42:20 +0200
> Wolfgang Schuster <schuster.wolfgang@gmail.com> wrote:
>
>> why does \startchemical take the name of a instance as argument (e.g.
>> \startchemical[important]) when
>> there is no way to create it because \definechemical is redefined and
>> the original version isn’t saved.
>>
>> Even \setupchemical[important][..,..=..,..] can’t be used because it
>> doesn’t resolve the parent setting.
>
> I did not realize that \startchemical took the name of an instance as
> argument - I have only used it with key=value, i.e.:
> \startchemical[...=...]
>
> I suppose that it uses some "standard" mechanisms.
>
>
> \definechemical[benzene] is different. It gets used as:
>
> \startchemical
>      \chemical[benzene,...]
> \stopchemical
>
>
> Perhaps there is some inconsistency with respect to ConTeXt syntax here.

the issue is that we have definechemical doing something different 
(compatibility) but we can do this:

in chem-str.mkiv:

% \installsimplecommandhandler \??chemical {chemical} \??chemical % no 
\define...
\installcommandhandler \??chemical {chemical} \??chemical % no \define...

\let\setupchemicals \setupchemical
\let\definechemicals\definechemical

then we can do:

\starttext

\definechemicals[foo][axis=on]

\startchemical[foo]
     \chemical[SIX,ROT2,B,R6,SUB1,FIVE,ROT1,B][1]
\stopchemical

\stoptext



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