[.tuc] oddity when storing a table

[.tuc] oddity when storing a table

[Philipp Gesang]

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Hi all,

I can’t explain the following behavior of the .tuc writer. When
passed a nested hash, context fails on the second pass if the
array part of the first nesting depth is empty:

·······································································

%% the commented lines work
\startluacode
  job.variables.tobesaved.foo = { bar = {  } }
  -- job.variables.tobesaved.foo = { "works now",  bar = {  } }
  -- job.variables.tobesaved.foo = { bar =  "works too" }
\stopluacode

\starttext foo \stoptext

·······································································

I get this error:

·······································································
  ! LuaTeX error ...text/tex/texmf-context/tex/context/base/cldf-ini.lua:410: no string to print
  stack traceback:
    [C]: in function 'flush'
    ...text/tex/texmf-context/tex/context/base/cldf-ini.lua:410: in function <...text/tex/texmf-context/tex/context/base/cldf-ini.lua:360>
    (tail call): ?
    ...text/tex/texmf-context/tex/context/base/core-uti.lua:112: in function 'initializer'
    ...text/tex/texmf-context/tex/context/base/core-uti.lua:200: in function 'load'
    ...text/tex/texmf-context/tex/context/base/core-uti.lua:66: in function 'initialize'
    <main ctx instance>:1: in main chunk.
  
  system          > tex > error on line 1 in file /home/phg/context/tex/texmf-context/tex/context/base/cont-yes.mkiv: LuaTeX error  ...
·······································································

Bug?

Regards
Philipp



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Re: [.tuc] oddity when storing a table

[Hans Hagen]

On 16-9-2012 19:17, Philipp Gesang wrote:
> Hi all,
>
> I can’t explain the following behavior of the .tuc writer. When
> passed a nested hash, context fails on the second pass if the
> array part of the first nesting depth is empty:
>
> ·······································································
>
> %% the commented lines work
> \startluacode
>    job.variables.tobesaved.foo = { bar = {  } }
>    -- job.variables.tobesaved.foo = { "works now",  bar = {  } }
>    -- job.variables.tobesaved.foo = { bar =  "works too" }
> \stopluacode
>
> \starttext foo \stoptext
>
> ·······································································
>
> I get this error:
>
> ·······································································
>    ! LuaTeX error ...text/tex/texmf-context/tex/context/base/cldf-ini.lua:410: no string to print
>    stack traceback:
>      [C]: in function 'flush'
>      ...text/tex/texmf-context/tex/context/base/cldf-ini.lua:410: in function <...text/tex/texmf-context/tex/context/base/cldf-ini.lua:360>
>      (tail call): ?
>      ...text/tex/texmf-context/tex/context/base/core-uti.lua:112: in function 'initializer'
>      ...text/tex/texmf-context/tex/context/base/core-uti.lua:200: in function 'load'
>      ...text/tex/texmf-context/tex/context/base/core-uti.lua:66: in function 'initialize'
>      <main ctx instance>:1: in main chunk.
>
>    system          > tex > error on line 1 in file /home/phg/context/tex/texmf-context/tex/context/base/cont-yes.mkiv: LuaTeX error  ...
> ·······································································
>
> Bug?

no, feature. job variables are just key/values and accessible at the tex 
end (you store 'works too' in 'bar')

if you want arbitrary data to be stores you need to used datasets, as 
explained in

http://wiki.contextgarden.net/Command/definedataset

-----------------------------------------------------------------
                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
     tel: 038 477 53 69 | voip: 087 875 68 74 | www.pragma-ade.com
                                              | www.pragma-pod.nl
-----------------------------------------------------------------
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maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
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___________________________________________________________________________________

Re: [.tuc] oddity when storing a table

[Philipp Gesang]

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···<date: 2012-09-16, Sunday>···<from: Hans Hagen>···

> On 16-9-2012 19:17, Philipp Gesang wrote:
> >Bug?
> 
> no, feature. job variables are just key/values and accessible at the
> tex end (you store 'works too' in 'bar')

Ok, I wasn’t aware of this restriction.

> if you want arbitrary data to be stores you need to used datasets,
> as explained in
> 
> http://wiki.contextgarden.net/Command/definedataset

Hmm, the wiki only covers the TeX macro interface whilst I am
mainly concerned with passing stuff right from the Lua end.

From my reading of core-dat.lua I gather that there is not really
a way to dump any Lua table (array or hash or mixed) via
datasets. Except directly writing to “tobesaved”.

·······································································
\starttext

\startluacode
  local n, t, d = job.datasets.setdata{
    name  = "not enough!!!11!1! grr!",
    delay = interfaces.variables.no,
    data  = "a=b,c=d,1=foo,2=bar,nested={second={third=whatever}}",
  }

  job.datasets.tobesaved.works_for_me = {
    this = { does = { "work", "for", nested = { "tables", "!", {{}} } } }
  }

  table.print(job.datasets.getdata("works_for_me", "this"), "this")
\stopluacode

\stoptext
·······································································

I hesitate to wikify the latter, though.

Philipp



> 
> -----------------------------------------------------------------
>                                           Hans Hagen | PRAGMA ADE
>               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
>     tel: 038 477 53 69 | voip: 087 875 68 74 | www.pragma-ade.com
>                                              | 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://tex.aanhet.net
> archive  : http://foundry.supelec.fr/projects/contextrev/
> wiki     : http://contextgarden.net
> ___________________________________________________________________________________

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___________________________________________________________________________________

Re: [.tuc] oddity when storing a table

[Hans Hagen]

On 17-9-2012 23:13, Philipp Gesang wrote:
> ···<date: 2012-09-16, Sunday>···<from: Hans Hagen>···
>
>> On 16-9-2012 19:17, Philipp Gesang wrote:
>>> Bug?
>>
>> no, feature. job variables are just key/values and accessible at the
>> tex end (you store 'works too' in 'bar')
>
> Ok, I wasn’t aware of this restriction.
>
>> if you want arbitrary data to be stores you need to used datasets,
>> as explained in
>>
>> http://wiki.contextgarden.net/Command/definedataset
>
> Hmm, the wiki only covers the TeX macro interface whilst I am
> mainly concerned with passing stuff right from the Lua end.
>
>  From my reading of core-dat.lua I gather that there is not really
> a way to dump any Lua table (array or hash or mixed) via
> datasets. Except directly writing to “tobesaved”.

And that is indeed somewhat nasty; I'll add a 'convert' key to the 
settings so that you can set raw data at the Lua end.

(I'll send you a Lua file for testing)

Hans


-----------------------------------------------------------------
                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
     tel: 038 477 53 69 | voip: 087 875 68 74 | www.pragma-ade.com
                                              | 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://tex.aanhet.net
archive  : http://foundry.supelec.fr/projects/contextrev/
wiki     : http://contextgarden.net
___________________________________________________________________________________