Re: CLD: context.getvariable as Lua variable

[Wagner Macedo <wagnerluis1982@gmail.com>]

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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
>
>
>
> ___________________________________________________________________________________
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> the Wiki!
>
> maillist : ntg-context@ntg.nl /
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>
> ___________________________________________________________________________________
>

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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
___________________________________________________________________________________