* Accessing string contents of a macro in Lua.
@ 2013-04-24 15:51 Sietse Brouwer
2013-04-24 16:50 ` luigi scarso
0 siblings, 1 reply; 3+ messages in thread
From: Sietse Brouwer @ 2013-04-24 15:51 UTC (permalink / raw)
To: mailing list for ConTeXt users
Hi all,
Below are three methods of defining a dimension / dimension string in
ConTeXt --- the first two boil down to storing a string in a macro,
the last is a proper TeX dimen. I want to access these dimensions from
Lua.
I can access the dimen via tex.dimen.ColumnC, but how can I access the
macro contents?
If there is no solution, I can always explicitly pass the value to Lua with
\ctxlua{var = '\measure{ColumnA}'}
, but I want to know if there is a Lua-only method to get these values.
%% MWE
\definemeasure[ColumnA][10mm]
\def\ColumnB{20mm}
\newdimen\ColumnC
\ColumnC=30mm
\startluacode
-- print values to stdout
logs.report('====')
logs.report('ColumnA', context.measure('ColumnA'))
logs.report('ColumnB', context.ColumnB)
logs.report('ColumnC', tex.dimen.ColumnC) -- prints in scaled points
print('====')
\stopluacode
Cheers,
Sietse
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^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: Accessing string contents of a macro in Lua.
2013-04-24 15:51 Accessing string contents of a macro in Lua Sietse Brouwer
@ 2013-04-24 16:50 ` luigi scarso
2013-04-24 19:21 ` Hans Hagen
0 siblings, 1 reply; 3+ messages in thread
From: luigi scarso @ 2013-04-24 16:50 UTC (permalink / raw)
To: mailing list for ConTeXt users
On Wed, Apr 24, 2013 at 5:51 PM, Sietse Brouwer <sbbrouwer@gmail.com> wrote:
> Hi all,
>
> Below are three methods of defining a dimension / dimension string in
> ConTeXt --- the first two boil down to storing a string in a macro,
> the last is a proper TeX dimen. I want to access these dimensions from
> Lua.
>
> I can access the dimen via tex.dimen.ColumnC, but how can I access the
> macro contents?
> If there is no solution, I can always explicitly pass the value to Lua with
>
> \ctxlua{var = '\measure{ColumnA}'}
>
> , but I want to know if there is a Lua-only method to get these values.
>
> %% MWE
> \definemeasure[ColumnA][10mm]
>
> \def\ColumnB{20mm}
not a general solution
%%%
\def\ColumnB{20mm}
\starttext
\startluacode
local c = "\\csname ColumnB\\endcsname"
context("ColumnB=%s",c)
\stopluacode
\par
\toks0=\expandafter{\ColumnB}
\startluacode
context("ColumnB=%s",tex.toks[0])
\stopluacode
\stoptext
--
luigi
___________________________________________________________________________________
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maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
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archive : http://foundry.supelec.fr/projects/contextrev/
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___________________________________________________________________________________
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: Accessing string contents of a macro in Lua.
2013-04-24 16:50 ` luigi scarso
@ 2013-04-24 19:21 ` Hans Hagen
0 siblings, 0 replies; 3+ messages in thread
From: Hans Hagen @ 2013-04-24 19:21 UTC (permalink / raw)
To: mailing list for ConTeXt users
On 4/24/2013 6:50 PM, luigi scarso wrote:
> On Wed, Apr 24, 2013 at 5:51 PM, Sietse Brouwer <sbbrouwer@gmail.com> wrote:
>> Hi all,
>>
>> Below are three methods of defining a dimension / dimension string in
>> ConTeXt --- the first two boil down to storing a string in a macro,
>> the last is a proper TeX dimen. I want to access these dimensions from
>> Lua.
>>
>> I can access the dimen via tex.dimen.ColumnC, but how can I access the
>> macro contents?
>> If there is no solution, I can always explicitly pass the value to Lua with
>>
>> \ctxlua{var = '\measure{ColumnA}'}
>>
>> , but I want to know if there is a Lua-only method to get these values.
>>
>> %% MWE
>> \definemeasure[ColumnA][10mm]
>>
>> \def\ColumnB{20mm}
%
> not a general solution
> %%%
> \def\ColumnB{20mm}
\newtoks\MyColumnB \MyColumnB{20mm}
> \starttext
> \startluacode
> local c = "\\csname ColumnB\\endcsname"
> context("ColumnB=%s",c)
> \stopluacode
>
> \par
> \toks0=\expandafter{\ColumnB}
> \startluacode
> context("ColumnB=%s",tex.toks[0])
context("ColumnB=%s",tex.toks.MyColumnB)
> \stopluacode
>
> \stoptext
>
>
>
>
> --
> luigi
> ___________________________________________________________________________________
> 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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___________________________________________________________________________________
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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___________________________________________________________________________________
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