TeX control sequence inside XML param

TeX control sequence inside XML param

[Vit Zyka]

Hallo,

it is possible to use TeX control sequence inside XML param? How?
Example:

<figure file="file.pdf" width=".45\textwidth" />
                                   ^^^^^^^^^^
\defineXMLenvironment[figure][file=,width=]
   {}
   {\externalfigure[\XMLop{file}][width=\XMLop{width}]}

Thank you
Vit Zyka

----------------------------------------------
Error message (from a bit complex source):
! Missing \endcsname inserted.
<to be read again>
                    \texescape
\XML:ent:tex-backslash ...kslash \else \texescape
                                                   \fi
\param:1 ->width=.45\getXMLentity {tex-backslash}
                                                  textwidth
\getvalue #1->\csname #1
                         \endcsname
\calculateexternalfigure ...guresvg #1[#4][#5][#6]
                                                   \doifsomething 
\@@efmaxwid...
<argument> ...dummy ][\filewithpath ][\param ][][]
 
\calculateexternalscreenfi...

Re: TeX control sequence inside XML param

[Hans Hagen]

Vit Zyka wrote:
> Hallo,
> 
> it is possible to use TeX control sequence inside XML param? How?
> Example:
> 
> <figure file="file.pdf" width=".45\textwidth" />
>                                   ^^^^^^^^^^
> \defineXMLenvironment[figure][file=,width=]
>   {}
>   {\externalfigure[\XMLop{file}][width=\XMLop{width}]}

Hm. You're lucky. We should make a test suite (at the wiki) to make sure that 
this kind of stuff keeps working -)

\starttext

\defineXMLentity[ctx-var-textwidth] {\textwidth}

\defineXMLcommand[test][width=\textwidth]
   {\the\dimexpr\XMLop{width}\relax}

\startXMLdata
<test width=".45&ctx-var-textwidth;"/>
<test width="&ctx-var-textwidth;"/>
\stopXMLdata

\stoptext




-----------------------------------------------------------------
                                           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
-----------------------------------------------------------------

Re: TeX control sequence inside XML param

[Vit Zyka]

Hans Hagen wrote:
> Vit Zyka wrote:
> 
>> Hallo,
>>
>> it is possible to use TeX control sequence inside XML param? How?
>> Example:
>>
>> <figure file="file.pdf" width=".45\textwidth" />
>>                                   ^^^^^^^^^^
>> \defineXMLenvironment[figure][file=,width=]
>>   {}
>>   {\externalfigure[\XMLop{file}][width=\XMLop{width}]}
> 
> 
> Hm. You're lucky. We should make a test suite (at the wiki) to make sure 
> that this kind of stuff keeps working -)
> 
> \starttext
> 
> \defineXMLentity[ctx-var-textwidth] {\textwidth}

I seeee! I might come to me... Actually I'd like to solve a bit more 
complex task:

\starttext

\defineXMLentity[ctx-var-textwidth] {\textwidth}

\newcount\FigNo
\defineXMLenvironment[float][]
   {\defineXMLpush[caption]%
    \global\FigNo=0
   }
   {\placefigure{\XMLflush{caption}}%
      {\dorecurse{\FigNo}%
         {\edef\filewithpath{\XMLpop{dir-fig}\getvalue{file:\recurselevel}}%
          \edef\param{\getvalue{param:\recurselevel}}%
          \externalfigure[\filewithpath][\param]}}%
   }
\defineXMLenvironment[figure][file=,context=]
   {}
   {\global\advance\FigNo by1 %
    \expanded{\setvalue{file:\the\FigNo}{\XMLop{file}}}%
    \expanded{\setvalue{param:\the\FigNo}{\XMLop{context}}}%
   }

\startXMLdata
<float>
   <figure file="cow.pdf" context="width=.5&ctx-var-textwidth;" />
   <figure file="hacker.jpg" context="width=3cm" />
   <caption>Cow and hacker.</caption>
</float>
\stopXMLdata

\stoptext

Re: TeX control sequence inside XML param

[Hans Hagen]

Vit Zyka wrote:

> I seeee! I might come to me... Actually I'd like to solve a bit more 
> complex task:

some day ...

>          \externalfigure[\filewithpath][\param]}}%

you need to expand the parameters

   \expanded{\external...[...][...]}

food for thought ... (and the wiki)

\starttext

\useMPlibrary[dum]

\defineXMLentity[ctx-var-textwidth] {\textwidth}

\defineXMLenvironmentsave
   [float]
   {\bgroup
    \defineXMLsave[caption]%
    \defineXMLignore[figure]}
   {\XMLflush{float}%
    \defineXMLignore
      [caption]
    \defineXMLcommand
      [figure]
      [file=dummy,context=]
      {\expanded{\externalfigure
        [\XMLflush{dir-fig}\XMLop{file}][\XMLop{context}]}%
       \kern1em
       \ignorespaces}%
    \placefigure
      {\XMLflush{caption}}
      {\hbox{\ignorespaces\XMLflush{float}\removeunwantedspaces}}%
    \egroup}


\startXMLdata
<float>
   <figure file="cow.pdf" context="width=.5&ctx-var-textwidth;" />
   <figure file="hacker.jpg" context="width=3cm" />
   <caption>Cow and hacker.</caption>
</float>
\stopXMLdata

\stoptext



-----------------------------------------------------------------
                                           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
-----------------------------------------------------------------

Re: TeX control sequence inside XML param

[Vit Zyka]

Hans Hagen wrote:
> Vit Zyka wrote:
> 
> \startXMLdata
> <float>
>   <figure file="cow.pdf" context="width=.5&ctx-var-textwidth;" />
>   <figure file="hacker.jpg" context="width=3cm" />
>   <caption>Cow and hacker.</caption>
> </float>
> \stopXMLdata
 >
> food for thought ... (and the wiki)

That is a clever solution! This two pass tag processing. I have not been 
thinking this way yet. Thank you, Hans. (Wiki: 
http://contextgarden.net/Two_pass_tag_processing_example)

Unfortunately I have next two problems:
1) How to process <pre> HTML tag. I have tried many solution derived from
-----
\starttext
\defineXMLenvironment[pre]
   {\starttyping}
   {\stoptyping}
\startXMLdata
   <pre>
     Some code line.
     And another one.
   </pre>
\stopXMLdata
\stoptext
-----
but without success.

2) It seems to me there is some catcode clash inside XML environment:
-----
\defineXMLentity[hyphen]{|_|}
\starttext
   dojde|_|li
   \startXMLdata
     dojde&hyphen;li
   \stopXMLdata
\stoptext
------

Vit Zyka

> \starttext
> 
> \useMPlibrary[dum]
> 
> \defineXMLentity[ctx-var-textwidth] {\textwidth}
> 
> \defineXMLenvironmentsave
>   [float]
>   {\bgroup
>    \defineXMLsave[caption]%
>    \defineXMLignore[figure]}
>   {\XMLflush{float}%
>    \defineXMLignore
>      [caption]
>    \defineXMLcommand
>      [figure]
>      [file=dummy,context=]
>      {\expanded{\externalfigure
>        [\XMLflush{dir-fig}\XMLop{file}][\XMLop{context}]}%
>       \kern1em
>       \ignorespaces}%
>    \placefigure
>      {\XMLflush{caption}}
>      {\hbox{\ignorespaces\XMLflush{float}\removeunwantedspaces}}%
>    \egroup}
> 
> 
> \startXMLdata
> <float>
>   <figure file="cow.pdf" context="width=.5&ctx-var-textwidth;" />
>   <figure file="hacker.jpg" context="width=3cm" />
>   <caption>Cow and hacker.</caption>
> </float>
> \stopXMLdata
> 
> \stoptext