Weird error when using \startformula inside lua

Weird error when using \startformula inside lua

[Aditya Mahajan via ntg-context]

I sometimes define lua functions for showing out worked out calculations. The following minimal example shows that 

  context([[\startformula ... \stopformula]]) 

fails in LMTX with an error message:

tex error       > tex error on line 3 in file ./test.tex: Undefined control sequence \undefined 

MWE:

\startluacode
  thirddata = thirddata or {}

  local comment = [[
    This is a famous formula
    \startformula
      a^2 + b^2 = c^2
    \stopformula
  ]]

  function thirddata.explanation()
      context(comment)
  end

\stopluacode

\starttext
\ctxlua{thirddata.explanation()}
\stoptext

The actual use case is more complicated (where I use templates, so I don't want to convert everything to context.startformula() etc.). The example compiles with MkIV but not LMTX.

Any idea what is going on?

Thanks,
Aditya

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Re: Weird error when using \startformula inside lua

[Hans Hagen via ntg-context]

On 9/11/2021 5:11 AM, Aditya Mahajan via ntg-context wrote:
> I sometimes define lua functions for showing out worked out calculations. The following minimal example shows that
> 
>    context([[\startformula ... \stopformula]])
> 
> fails in LMTX with an error message:
> 
> tex error       > tex error on line 3 in file ./test.tex: Undefined control sequence \undefined
> 
> MWE:
> 
> \startluacode
>    thirddata = thirddata or {}
> 
>    local comment = [[
>      This is a famous formula
>      \startformula
>        a^2 + b^2 = c^2
>      \stopformula
>    ]]
> 
>    function thirddata.explanation()
>        context(comment)
>    end
> 
> \stopluacode
> 
> \starttext
> \ctxlua{thirddata.explanation()}
> \stoptext
> 
> The actual use case is more complicated (where I use templates, so I don't want to convert everything to context.startformula() etc.). The example compiles with MkIV but not LMTX.
> 
> Any idea what is going on?
\enabletrackers[context*]

shows that we have an unprotected \startformula so we need this in 
strc-mat.mkxl:

\permanent\protected\defcsname\e!start\v!formula\endcsname{\strc_formulas_start_formula{}}
\permanent\protected\defcsname\e!stop 
\v!formula\endcsname{\strc_formulas_stop_formula}

\permanent\tolerant\protected\def\defineformulaalternative[#1]#*[#2]#*[#3]%
   {\frozen\instance\protected\defcsname\e!start#1\v!formula\endcsname{#2}%
    \frozen\instance\protected\defcsname\e!stop #1\v!formula\endcsname{#3}}

(the \protected probably got lost when i added overload protection etc)

Hans

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Re: Weird error when using \startformula inside lua

[Aditya Mahajan via ntg-context]

On Sat, 11 Sep 2021, Hans Hagen wrote:

> On 9/11/2021 5:11 AM, Aditya Mahajan via ntg-context wrote:
> > I sometimes define lua functions for showing out worked out calculations.
> > The following minimal example shows that
> > 
> >    context([[\startformula ... \stopformula]])
> > 
> > fails in LMTX with an error message:
> > 
> > tex error       > tex error on line 3 in file ./test.tex: Undefined control
> > sequence \undefined
> > 
> > MWE:
> > 
> > \startluacode
> >    thirddata = thirddata or {}
> > 
> >    local comment = [[
> >      This is a famous formula
> >      \startformula
> >        a^2 + b^2 = c^2
> >      \stopformula
> >    ]]
> > 
> >    function thirddata.explanation()
> >        context(comment)
> >    end
> > 
> > \stopluacode
> > 
> > \starttext
> > \ctxlua{thirddata.explanation()}
> > \stoptext
> > 
> > The actual use case is more complicated (where I use templates, so I don't
> > want to convert everything to context.startformula() etc.). The example
> > compiles with MkIV but not LMTX.
> > 
> > Any idea what is going on?
> \enabletrackers[context*]
> 
> shows that we have an unprotected \startformula so we need this in
> strc-mat.mkxl:
> 
> \permanent\protected\defcsname\e!start\v!formula\endcsname{\strc_formulas_start_formula{}}
> \permanent\protected\defcsname\e!stop
> \v!formula\endcsname{\strc_formulas_stop_formula}
> 
> \permanent\tolerant\protected\def\defineformulaalternative[#1]#*[#2]#*[#3]%
>   {\frozen\instance\protected\defcsname\e!start#1\v!formula\endcsname{#2}%
>    \frozen\instance\protected\defcsname\e!stop #1\v!formula\endcsname{#3}}
> 
> (the \protected probably got lost when i added overload protection etc)

Thanks! This fixes the error in my main document as well.

Aditya
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Re: Weird error when using \startformula inside lua

[Sylvain Hubert via ntg-context]

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The problem also concerns \starttyping:

\starttext
.
\startluacode
context([[
\starttyping
\stoptyping
]])
\stopluacode
\stoptext

tex error       > runaway error: end of file encountered
mtx-context     | fatal error: return code: 256

%%%%%%%%%

\starttext
.
\startluacode
context([[
\starttyping

foobar
\stoptyping
]])
\stopluacode
\stoptext

tex error       > tex error on line 5 in file ./test.tex:

lua error:

        registered function call [1041]:
...mtx/tex/texmf-context/tex/context/base/mkxl/buff-ini.lmt:534: invalid
value (nil) at index 3 in table for '
concat'
stack traceback:
        [C]: in function 'table.concat'
        ...mtx/tex/texmf-context/tex/context/base/mkxl/buff-ini.lmt:534: in
upvalue 'pickup'
        ...mtx/tex/texmf-context/tex/context/base/mkxl/buff-ini.lmt:677: in
function <...mtx/tex/texmf-context/tex/context/base/mkxl/buff-ini.lmt:668>
        (...tail calls...)


Sylvain

On Sat, 11 Sept 2021 at 05:12, Aditya Mahajan via ntg-context <
ntg-context@ntg.nl> wrote:

> I sometimes define lua functions for showing out worked out calculations.
> The following minimal example shows that
>
>   context([[\startformula ... \stopformula]])
>
> fails in LMTX with an error message:
>
> tex error       > tex error on line 3 in file ./test.tex: Undefined
> control sequence \undefined
>
> MWE:
>
> \startluacode
>   thirddata = thirddata or {}
>
>   local comment = [[
>     This is a famous formula
>     \startformula
>       a^2 + b^2 = c^2
>     \stopformula
>   ]]
>
>   function thirddata.explanation()
>       context(comment)
>   end
>
> \stopluacode
>
> \starttext
> \ctxlua{thirddata.explanation()}
> \stoptext
>
> The actual use case is more complicated (where I use templates, so I don't
> want to convert everything to context.startformula() etc.). The example
> compiles with MkIV but not LMTX.
>
> Any idea what is going on?
>
> Thanks,
> Aditya
>
>
> ___________________________________________________________________________________
> 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
>
> ___________________________________________________________________________________
>

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