constructing block content partly with lua

constructing block content partly with lua

[Sanjoy Mahajan]

Dear List,

I've been trying to construct part of a block's content programmatically
with Lua.  Despite many experiments and much rereading of the cld manual
(especially chapter 3 on functions), the following attempt fails for
reasons that perplex me.  Below is the MNWE (Minimal NonWorking
Example).  It fails with these lines in the log file:

  structure       > sectioning > subject @ level 3 : 0.0.0 -> Answers

  tex error       > tex error on line 1 in file virtual://block.answer.1: ! Undefined control sequence

  l.1 \oneargTestparameter


That is, when the "answer" block is included via \useblocks, somehow the
beginning of the answer, which should be "\onearg{Test parameter}", has
its curly braces and spaces elided.

What characteristic(s) of the Lua interface am I missing?  Thank you if
you happen to where I've gone wrong.  I've also tried steppers without
much luck (and, admittedly, without really understanding their use).

=============== testluabeginblock.tex ===============
\defineblock[answer]
\hideblocks[answer]

\def\onearg#1{{\bf #1}}
\def\noarg{{\it fixed argument}}

\starttext

\startluacode
  context.beginanswer()
  context("\\onearg{Test parameter}")
\stopluacode
This is part of the answer.

\endanswer

\subject{Answers}

\useblocks[answer]

\stoptext
=============== end testluabeginblock.tex ===============

-Sanjoy



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Re: constructing block content partly with lua

[Hans Hagen]

On 2/5/2019 4:01 PM, Sanjoy Mahajan wrote:
> Dear List,
> 
> I've been trying to construct part of a block's content programmatically
> with Lua.  Despite many experiments and much rereading of the cld manual
> (especially chapter 3 on functions), the following attempt fails for
> reasons that perplex me.  Below is the MNWE (Minimal NonWorking
> Example).  It fails with these lines in the log file:
> 
>    structure       > sectioning > subject @ level 3 : 0.0.0 -> Answers
> 
>    tex error       > tex error on line 1 in file virtual://block.answer.1: ! Undefined control sequence
> 
>    l.1 \oneargTestparameter
> 
> 
> That is, when the "answer" block is included via \useblocks, somehow the
> beginning of the answer, which should be "\onearg{Test parameter}", has
> its curly braces and spaces elided.
> 
> What characteristic(s) of the Lua interface am I missing?  Thank you if
> you happen to where I've gone wrong.  I've also tried steppers without
> much luck (and, admittedly, without really understanding their use).
> 
> =============== testluabeginblock.tex ===============
> \defineblock[answer]
> \hideblocks[answer]
> 
> \def\onearg#1{{\bf #1}}
> \def\noarg{{\it fixed argument}}
> 
> \starttext
> 
> \startluacode
>    context.beginanswer()
>    context("\\onearg{Test parameter}")

does

context.onearg("Test parameter")

work?


> \stopluacode
> This is part of the answer.
> 
> \endanswer
> 
> \subject{Answers}
> 
> \useblocks[answer]
> 
> \stoptext
> =============== end testluabeginblock.tex ===============
> 
> -Sanjoy
> 
> 
> 
> ___________________________________________________________________________________
> 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://context.aanhet.net
> archive  : https://bitbucket.org/phg/context-mirror/commits/
> wiki     : http://contextgarden.net
> ___________________________________________________________________________________
> 


-- 

-----------------------------------------------------------------
                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
        tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
-----------------------------------------------------------------
___________________________________________________________________________________
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://context.aanhet.net
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___________________________________________________________________________________

Re: constructing block content partly with lua

[Sanjoy Mahajan]

On 2019-02-05 16:24, Hans Hagen <j.hagen@xs4all.nl> wrote:

>> \startluacode
>>    context.beginanswer()
>>    context("\\onearg{Test parameter}")
>
> does
>
> context.onearg("Test parameter")
>
> work?

Sorry, I forgot to say that I had tried that version too but also with
no luck.  Also, either version of onerg works as expected if I delete
the context.beginanswer() and the \endanswer lines.

-Sanjoy
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Re: constructing block content partly with lua

[Hans Hagen]

On 2/5/2019 4:28 PM, Sanjoy Mahajan wrote:
> On 2019-02-05 16:24, Hans Hagen <j.hagen@xs4all.nl> wrote:
> 
>>> \startluacode
>>>     context.beginanswer()
>>>     context("\\onearg{Test parameter}")
>>
>> does
>>
>> context.onearg("Test parameter")
>>
>> work?
> 
> Sorry, I forgot to say that I had tried that version too but also with
> no luck.  Also, either version of onerg works as expected if I delete
> the context.beginanswer() and the \endanswer lines.
the problem is that you effectively use buffers so you have a different 
catcode regime ... i'm not sure what you want but thsi might give a clue

\starttext

\defineblock[foo]

\beginfoo
     test 1
\endfoo

\startluacode
buffers.assign("temp","test 2")
structures.blocks.save("foo",nil,nil,"temp")
\stopluacode

\useblocks[foo]

\stoptext

there are mechanisms for templates for constructing more meaningful 
content than "test 2" (see test suite)

-----------------------------------------------------------------
                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
        tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
-----------------------------------------------------------------
___________________________________________________________________________________
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
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archive  : https://bitbucket.org/phg/context-mirror/commits/
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___________________________________________________________________________________

Re: constructing block content partly with lua

[Sanjoy Mahajan]

On 2019-02-05 17:21, Hans Hagen <j.hagen@xs4all.nl> wrote:

> i'm not sure what you want but thsi might give a clue

> ...
> \startluacode
> buffers.assign("temp","test 2")
> structures.blocks.save("foo",nil,nil,"temp")
> \stopluacode

Ah, thanks, that looks like what I need, or at least part of it, and
will keep me busy making more experiments.

-Sanjoy
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maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
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___________________________________________________________________________________