[NTG-context] expanded doif's

[NTG-context] expanded doif's

[Hans van der Meer via ntg-context]

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I  remember there was an incantation to work with expanded doif's etc. 
In this case I need \doifelsedefined{ARG} with ARG expanded.
I lost the exact spelling of the command and dldn't find it in the garden. 
What was it?

yours sincerely
dr. Hans van der Meer




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[NTG-context] Re: expanded doif's

[Wolfgang Schuster]

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Hans van der Meer via ntg-context schrieb am 16.06.2024 um 22:29:
> I  remember there was an incantation to work with expanded doif's etc.
> In this case I need \doifelsedefined{ARG} with ARG expanded.
> I lost the exact spelling of the command and dldn't find it in the 
> garden.
> What was it?

Can you provide a example where you have problems with \doifdefined etc.

Wolfgang


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[NTG-context] Re: expanded doif's

[Wolfgang Schuster]

Hans van der Meer schrieb am 17.06.2024 um 09:01:
> I want to show an errormessage when the macro is undefined. It requires 
> expansion of \xmlatt{#1}{name}.
> \ifdefined\xmlatt{#1}{name} didn't worked nor \expandafter\ifdefined
> I thought of the expanding \doif's.
> 
> See the attached output of this xmlsetup attached.
> 
> \startxmlsetups hvdm:system:macrocall
> %
> \doifelsedefined{\xmlatt{#1}{name}}
> {
> %
> %macro without argument
> %
> \ifxmlattempty{#1}{arg}
> \begincsname\xmlatt{#1}{name}\endcsname
> %
> %macro with argument
> %
> \else
> \begincsname\xmlatt{#1}{name}\endcsname{\xmlatt{#1}{arg}}
> \fi
> }
> {
> \ERROR{macro \xmlatt{#1}{name} is not defined}
> }
> \stopxmlsetups

I have no idea what's wrong in your code without a proper minimal 
example. As the example below shows you can use \doifelsedefined in 
combination with \xmlatt.

\startbuffer[ifdefined]
<document>
   <macro name="bold" arg="text"/>
   <macro name="hvdm" arg="text"/>
</document>
\stopbuffer

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

\startxmlsetups xml:macro

   \doifelsedefined{\xmlatt{#1}{name}}
     {\texdefinition{\xmlatt{#1}{name}}{\xmlatt{#1}{arg}}}
     {{\tttf macro \tex{\xmlatt{#1}{name}} not defined}}

% \ifcsname\xmlatt{#1}{name}\endcsname
%   \lastnamedcs{\xmlatt{#1}{arg}}
% \else
%   %
% \fi

\stopxmlsetups

\startxmlsetups xml:hvdm
\xmlsetsetup{\xmldocument}{document|macro}{xml:*}
\stopxmlsetups

\xmlregistersetup{xml:hvdm}

\starttext
\xmlprocessbuffer{hvdm}{ifdefined}{}
\stoptext

Wolfgang
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[NTG-context] Re: expanded doif's

[Pablo Rodriguez via ntg-context]

On 6/17/24 16:52, Wolfgang Schuster wrote:
> Hans van der Meer schrieb am 17.06.2024 um 09:01:
>> I want to show an errormessage when the macro is undefined. It requires
>> expansion of \xmlatt{#1}{name}.

dr. van der Meer,

\xmldoifatt (with ifnot and ifelse variants) should cover that case
(https://www.pragma-ade.com/general/manuals/xml-mkiv.pdf#search=xmldoifatt).

But I cannot make any of these conditionals work (I‘m afraid there may
be an issue with their definition).

  \startbuffer[ifdefined]
  <document>
    <macro name="bold" arg="text"/>
    <macro name="hvdm" arg="text"/>
  </document>
  \stopbuffer

  \startxmlsetups xml:hvdm
    \xmlsetsetup{#1}{*}{xml:*}
  \stopxmlsetups

  \xmlregistersetup{xml:hvdm}

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

  \startxmlsetups xml:macro
    \xmlatt{#1}{name}\\
    \xmlatt{#1}{arg}\\
    \xmldoifelseatt{#1}
    {name}{yes}{no}\\
    \xmldoifelseatt{#1}
    {names}{yes}{no}\\
  \stopxmlsetups

  \starttext
  \xmlprocessbuffer{hvdm}{ifdefined}{}
  \stoptext

As a workaround \doifelsetext{\xmlatt{#1}{name}}{yes}{no} may do the
trick here.

I hope it helps,

Pablo
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[NTG-context] Re: expanded doif's

[Hans van der Meer via ntg-context]

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Finally found the culprit. Macro call to restart reporting errors in the printed output residing at the wrong point in the code.
Again thanks for pointing out where it was not.

yours sincerely
dr. Hans van der Meer



> On 17 Jun 2024, at 16:52, Wolfgang Schuster <wolfgang.schuster.lists@gmail.com> wrote:
> 
> Hans van der Meer schrieb am 17.06.2024 um 09:01:
>> I want to show an errormessage when the macro is undefined. It requires expansion of \xmlatt{#1}{name}.
>> \ifdefined\xmlatt{#1}{name} didn't worked nor \expandafter\ifdefined
>> I thought of the expanding \doif's.
>> See the attached output of this xmlsetup attached.
>> \startxmlsetups hvdm:system:macrocall
>> %
>> \doifelsedefined{\xmlatt{#1}{name}}
>> {
>> %
>> %macro without argument
>> %
>> \ifxmlattempty{#1}{arg}
>> \begincsname\xmlatt{#1}{name}\endcsname
>> %
>> %macro with argument
>> %
>> \else
>> \begincsname\xmlatt{#1}{name}\endcsname{\xmlatt{#1}{arg}}
>> \fi
>> }
>> {
>> \ERROR{macro \xmlatt{#1}{name} is not defined}
>> }
>> \stopxmlsetups
> 
> I have no idea what's wrong in your code without a proper minimal example. As the example below shows you can use \doifelsedefined in combination with \xmlatt.
> 
> \startbuffer[ifdefined]
> <document>
>  <macro name="bold" arg="text"/>
>  <macro name="hvdm" arg="text"/>
> </document>
> \stopbuffer
> 
> \startxmlsetups xml:document
>  \xmlflush{#1}
> \stopxmlsetups
> 
> \startxmlsetups xml:macro
> 
>  \doifelsedefined{\xmlatt{#1}{name}}
>    {\texdefinition{\xmlatt{#1}{name}}{\xmlatt{#1}{arg}}}
>    {{\tttf macro \tex{\xmlatt{#1}{name}} not defined}}
> 
> % \ifcsname\xmlatt{#1}{name}\endcsname
> %   \lastnamedcs{\xmlatt{#1}{arg}}
> % \else
> %   %
> % \fi
> 
> \stopxmlsetups
> 
> \startxmlsetups xml:hvdm
> \xmlsetsetup{\xmldocument}{document|macro}{xml:*}
> \stopxmlsetups
> 
> \xmlregistersetup{xml:hvdm}
> 
> \starttext
> \xmlprocessbuffer{hvdm}{ifdefined}{}
> \stoptext
> 
> Wolfgang
> ___________________________________________________________________________________
> If your question is of interest to others as well, please add an entry to the Wiki!
> 
> maillist : ntg-context@ntg.nl / https://mailman.ntg.nl/mailman3/lists/ntg-context.ntg.nl
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> ___________________________________________________________________________________


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