* CLD: context.getvariable as Lua variable
@ 2012-01-05 14:49 Wagner Macedo
2012-01-05 16:04 ` Wolfgang Schuster
0 siblings, 1 reply; 5+ messages in thread
From: Wagner Macedo @ 2012-01-05 14:49 UTC (permalink / raw)
To: ntg-context
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Hello,
I'm relatively quite new to TeX world. This is my first message to list. I
hope you understand me, English isn't my mother language.
I'm trying to use a variable set by \setvariable in Lua. I tried some
combinations, based on manual but I couldn't succeed. The code below
exemplifies what I wanted to do.
\starttext
\setvariable{namespace}{var}{Some context}
\ctxlua{
local s = context.getvariable("namespace", "var")
if s == "" then
...
else
...
end
}
\stoptext
I know that I can use some of \if* TeX commands, but coding in Lua is
better to me.
--
Wagner Macedo
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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
webpage : http://www.pragma-ade.nl / http://tex.aanhet.net
archive : http://foundry.supelec.fr/projects/contextrev/
wiki : http://contextgarden.net
___________________________________________________________________________________
^ permalink raw reply [flat|nested] 5+ messages in thread* Re: CLD: context.getvariable as Lua variable
2012-01-05 14:49 CLD: context.getvariable as Lua variable Wagner Macedo
@ 2012-01-05 16:04 ` Wolfgang Schuster
2012-01-05 17:22 ` Wagner Macedo
0 siblings, 1 reply; 5+ messages in thread
From: Wolfgang Schuster @ 2012-01-05 16:04 UTC (permalink / raw)
To: mailing list for ConTeXt users
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Am 05.01.2012 um 15:49 schrieb Wagner Macedo:
> Hello,
>
> I'm relatively quite new to TeX world. This is my first message to list. I hope you understand me, English isn't my mother language.
>
> I'm trying to use a variable set by \setvariable in Lua. I tried some combinations, based on manual but I couldn't succeed. The code below exemplifies what I wanted to do.
>
> \starttext
> \setvariable{namespace}{var}{Some context}
> \ctxlua{
> local s = context.getvariable("namespace", "var")
>
> if s == "" then
> ...
> else
> ...
> end
> }
> \stoptext
>
> I know that I can use some of \if* TeX commands, but coding in Lua is better to me.
What you’re trying is not possible but there are other ways to check the content of the variable in Lua.
\startluacode
userdata = userdata or { }
function userdata.checkvariable(variable)
if variable == "" then
context("EMPTY")
else
context("NOT EMPTY")
end
end
\stopluacode
\setvariable{wagner}{name}{Wagner Macedo}
\starttext
\ctxlua{userdata.checkvariable("\getvariable{wagner}{name}")}
% This does only with \startlua or \ctxlua
\startlua
local name = "\getvariable{wagner}{name}"
if name == "" then
context("No Text")
else
name = "Name: " .. name
context(name)
end
\stoplua
\stoptext
A different method is to save the \setvariables entries in a Lua table and check the entries of the table.
\startluacode
userdata = userdata or { }
userdata.macedo = userdata.macedo or { }
userdata.macedo.data = { }
function userdata.macedo.savevariables(variables)
userdata.macedo.data = variables
end
function userdata.macedo.checkvariables()
local variables = userdata.macedo.data
-- check for name
if variables.name == "" then
context("Name: No name set")
context.par()
else
context("Name: "..variables.name)
context.par()
end
-- check for address
if variables.address == "" then
context("Address: No address set")
context.par()
else
context("Address: "..variables.address)
context.par()
end
end
\stopluacode
\starttexdefinition SaveVariables
\startlua
userdata.macedo.savevariables{
name = "\getvariable{macedo}{name}",
address = "\getvariable{macedo}{address}",
}
\stoplua
\stoptexdefinition
\setvariables[macedo][set=\SaveVariables]
\starttext
\setvariables[macedo][name=Wagner Macedo]
\ctxlua{userdata.macedo.checkvariables()}
\setvariables[macedo][address=Secret]
\ctxlua{userdata.macedo.checkvariables()}
\stoptext
Wolfgang
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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
webpage : http://www.pragma-ade.nl / http://tex.aanhet.net
archive : http://foundry.supelec.fr/projects/contextrev/
wiki : http://contextgarden.net
___________________________________________________________________________________
^ permalink raw reply [flat|nested] 5+ messages in thread* Re: CLD: context.getvariable as Lua variable
2012-01-05 16:04 ` Wolfgang Schuster
@ 2012-01-05 17:22 ` Wagner Macedo
2012-01-05 17:39 ` Wolfgang Schuster
0 siblings, 1 reply; 5+ messages in thread
From: Wagner Macedo @ 2012-01-05 17:22 UTC (permalink / raw)
To: mailing list for ConTeXt users
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Firstly, thanks by answer.
The second way is nice, but could be generic (e.g. save any variable in a
namespace)?
--
Wagner Macedo
On 5 January 2012 13:04, Wolfgang Schuster <schuster.wolfgang@googlemail.com
> wrote:
>
> Am 05.01.2012 um 15:49 schrieb Wagner Macedo:
>
> Hello,
>
> I'm relatively quite new to TeX world. This is my first message to list. I
> hope you understand me, English isn't my mother language.
>
> I'm trying to use a variable set by \setvariable in Lua. I tried some
> combinations, based on manual but I couldn't succeed. The code below
> exemplifies what I wanted to do.
>
> \starttext
> \setvariable{namespace}{var}{Some context}
> \ctxlua{
> local s = context.getvariable("namespace", "var")
>
> if s == "" then
> ...
> else
> ...
> end
> }
> \stoptext
>
> I know that I can use some of \if* TeX commands, but coding in Lua is
> better to me.
>
>
> What you’re trying is not possible but there are other ways to check the
> content of the variable in Lua.
>
> \startluacode
>
> userdata = userdata or { }
>
> function userdata.checkvariable(variable)
> if variable == "" then
> context("EMPTY")
> else
> context("NOT EMPTY")
> end
> end
>
> \stopluacode
>
> \setvariable{wagner}{name}{Wagner Macedo}
>
> \starttext
>
> \ctxlua{userdata.checkvariable("\getvariable{wagner}{name}")}
>
> % This does only with \startlua or \ctxlua
>
> \startlua
>
> local name = "\getvariable{wagner}{name}"
>
> if name == "" then
> context("No Text")
> else
> name = "Name: " .. name
> context(name)
> end
>
> \stoplua
>
> \stoptext
>
> A different method is to save the \setvariables entries in a Lua table and
> check the entries of the table.
>
> \startluacode
>
> userdata = userdata or { }
> userdata.macedo = userdata.macedo or { }
>
> userdata.macedo.data = { }
>
> function userdata.macedo.savevariables(variables)
> userdata.macedo.data = variables
> end
>
> function userdata.macedo.checkvariables()
> local variables = userdata.macedo.data
> -- check for name
> if variables.name == "" then
> context("Name: No name set")
> context.par()
> else
> context("Name: "..variables.name)
> context.par()
> end
> -- check for address
> if variables.address == "" then
> context("Address: No address set")
> context.par()
> else
> context("Address: "..variables.address)
> context.par()
> end
> end
>
> \stopluacode
>
> \starttexdefinition SaveVariables
> \startlua
> userdata.macedo.savevariables{
> name = "\getvariable{macedo}{name}",
> address = "\getvariable{macedo}{address}",
> }
> \stoplua
> \stoptexdefinition
>
> \setvariables[macedo][set=\SaveVariables]
>
> \starttext
>
> \setvariables[macedo][name=Wagner Macedo]
>
> \ctxlua{userdata.macedo.checkvariables()}
>
> \setvariables[macedo][address=Secret]
>
> \ctxlua{userdata.macedo.checkvariables()}
>
> \stoptext
>
> Wolfgang
>
>
>
> ___________________________________________________________________________________
> 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
webpage : http://www.pragma-ade.nl / http://tex.aanhet.net
archive : http://foundry.supelec.fr/projects/contextrev/
wiki : http://contextgarden.net
___________________________________________________________________________________
^ permalink raw reply [flat|nested] 5+ messages in thread
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2012-01-05 14:49 CLD: context.getvariable as Lua variable Wagner Macedo
2012-01-05 16:04 ` Wolfgang Schuster
2012-01-05 17:22 ` Wagner Macedo
2012-01-05 17:39 ` Wolfgang Schuster
2012-01-05 17:57 ` Wagner Macedo
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