CLD: context.getvariable as Lua variable

CLD: context.getvariable as Lua variable

[Wagner Macedo]

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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
___________________________________________________________________________________

Re: CLD: context.getvariable as Lua variable

[Wolfgang Schuster]

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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
___________________________________________________________________________________

Re: CLD: context.getvariable as Lua variable

[Wagner Macedo]

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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
___________________________________________________________________________________

Re: CLD: context.getvariable as Lua variable

[Wolfgang Schuster]

Am 05.01.2012 um 18:22 schrieb Wagner Macedo:

> Firstly, thanks by answer.
> 
> The second way is nice, but could be generic (e.g. save any variable in a namespace)?

It would require a different method because \setvariables doesn’t provide
information about the values which are set. Can you describe what do you
want to achieve and I can try to provide a better solution.

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
___________________________________________________________________________________

Re: CLD: context.getvariable as Lua variable

[Wagner Macedo]

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Don't worry. It's not needed. I just wanted to avoid mix Lua and TeX codes.

I will survive using:

local s = "\getvariable{namespace}{var}"

Thank you by attention.

--
Wagner Macedo


On 5 January 2012 14:39, Wolfgang Schuster <schuster.wolfgang@googlemail.com
> wrote:

>
> Am 05.01.2012 um 18:22 schrieb Wagner Macedo:
>
> > Firstly, thanks by answer.
> >
> > The second way is nice, but could be generic (e.g. save any variable in
> a namespace)?
>
> It would require a different method because \setvariables doesn’t provide
> information about the values which are set. Can you describe what do you
> want to achieve and I can try to provide a better solution.
>
> 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
___________________________________________________________________________________