Finding values ​​of the context macros inside Lua functions (=expansion inside Lua functions?)

Finding values ​​of the context macros inside Lua functions (=expansion inside Lua functions?)

[Jaroslav Hajtmar]

Hello all,

For several hours trying to find solutions of problem.

My minimal example (I mention it at the end of email)  for clear reasons 
show, that :

7 is not number.
7 is number.
7is not number.
7is not number.


In the first is argument '\value' negotiable to the value, in second it 
is not possible (but for clear reasons too).

I would need to find from  argument ie macro '\\value'  in the LUA 
function its numerical value.
Is there any function that would do that?

I need something as a function of context (...), which would, however, 
its output is not located into ConTeXt, but its result get to back to a 
Lua function or into variable.
It is something like the expansion of an existing ConTeXt macro to its 
value.

Thanx Jaroslav


Here is my minimal example:

\startluacode
function test(arg)

   if type(arg)=='number' then
     context(arg.." is number.\\par ")
   else
     context(arg.." is not number.\\par")
   end

   if type(tonumber(arg))=='number' then
     context(arg.." is number.\\par ")
   else
     context(arg.." is not number.\\par")
   end
end

\stopluacode


\starttext
   \def\value{7}

   \ctxlua{test('\value');}

   \blank[big]

   \ctxlua{test('\\value');}

\stoptext




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___________________________________________________________________________________

Re: Finding values ​​of the context macros inside Lua functions (=expansion inside Lua functions?)

[Wolfgang Schuster]

Am 17.07.2011 um 14:01 schrieb Jaroslav Hajtmar:

> Hello all,
> 
> For several hours trying to find solutions of problem.
> 
> My minimal example (I mention it at the end of email)  for clear reasons show, that :
> 
> 7 is not number.
> 7 is number.
> 7is not number.
> 7is not number.
> 
> In the first is argument '\value' negotiable to the value, in second it is not possible (but for clear reasons too).
> 
> I would need to find from  argument ie macro '\\value'  in the LUA function its numerical value.
> Is there any function that would do that?
> 
> I need something as a function of context (...), which would, however, its output is not located into ConTeXt, but its result get to back to a Lua function or into variable.
> It is something like the expansion of an existing ConTeXt macro to its value.

\startluacode
function test(arg) -- use thirddata namespace for real functions
	if type(tonumber(arg)) == "number" then
		if tonumber(arg) > 0 then
			context("The argument \\quotation{%s} is a positive number",arg)
		else
			context("The argument \\quotation{%s} is a negative number",arg)
		end
	else
		context("The argument \\quotation{%s} is a string.",arg)
	end
end
\stopluacode

\starttext

\ctxlua{test("7")}

\ctxlua{test("-4")}

\ctxlua{test("text")}

\stoptext

Wolfgang

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___________________________________________________________________________________

Re: Finding values ​​of the context macros inside Lua functions (=expansion inside Lua functions?)

[Jaroslav Hajtmar]

Thanx Wolfgang.
But I guess I was wrong to express..

I need to pass parameter  '\\macroI' to the function  and turn it up a 
inside luafunction  expand to its value.

Ie when \def\macroI{6}

Then I need when I make in your example \ctxlua{test("\\macroI")} get 
the result :
"The argument “6” is a positive number" and not result "The argument “6” 
is a string."

see: I modify your example :

\startluacode
function test(arg) -- use thirddata namespace for real functions
     if type(tonumber(arg)) == "number" then
         if tonumber(arg) > 0 then
             context("The argument \\quotation{%s} is a positive 
number",arg)
         else
             context("The argument \\quotation{%s} is a negative 
number",arg)
         end
     else
         context("The argument \\quotation{%s} is a string.",arg)
     end
end
\stopluacode






\starttext

\ctxlua{test("7")}

\ctxlua{test("-4")}

\ctxlua{test("text")}

\def\macroI{6}

\ctxlua{test("\macroI")}

\ctxlua{test("\\macroI")}


\stoptext


Dne 17.7.2011 14:19, Wolfgang Schuster napsal(a):
> Am 17.07.2011 um 14:01 schrieb Jaroslav Hajtmar:
>
>    
>> >  Hello all,
>> >  
>> >  For several hours trying to find solutions of problem.
>> >  
>> >  My minimal example (I mention it at the end of email)  for clear reasons show, that :
>> >  
>> >  7 is not number.
>> >  7 is number.
>> >  7is not number.
>> >  7is not number.
>> >  
>> >  In the first is argument '\value' negotiable to the value, in second it is not possible (but for clear reasons too).
>> >  
>> >  I would need to find from  argument ie macro '\\value'  in the LUA function its numerical value.
>> >  Is there any function that would do that?
>> >  
>> >  I need something as a function of context (...), which would, however, its output is not located into ConTeXt, but its result get to back to a Lua function or into variable.
>> >  It is something like the expansion of an existing ConTeXt macro to its value.
>>      
> \startluacode
> function test(arg) -- use thirddata namespace for real functions
> 	if type(tonumber(arg)) == "number" then
> 		if tonumber(arg)>  0 then
> 			context("The argument \\quotation{%s} is a positive number",arg)
> 		else
> 			context("The argument \\quotation{%s} is a negative number",arg)
> 		end
> 	else
> 		context("The argument \\quotation{%s} is a string.",arg)
> 	end
> end
> \stopluacode
>
> \starttext
>
> \ctxlua{test("7")}
>
> \ctxlua{test("-4")}
>
> \ctxlua{test("text")}
>
> \stoptext
>
> Wolfgang
>
>
>    

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___________________________________________________________________________________

Re: Finding values ​​of the context macros inside Lua functions (=expansion inside Lua functions?)

[Wolfgang Schuster]

Am 17.07.2011 um 14:42 schrieb Jaroslav Hajtmar:

> Thanx Wolfgang.
> But I guess I was wrong to express..
> 
> I need to pass parameter  '\\macroI' to the function  and turn it up a inside luafunction  expand to its value.

Not possible.

> Ie when \def\macroI{6}
> 
> Then I need when I make in your example \ctxlua{test("\\macroI")} get the result :
> "The argument “6” is a positive number" and not result "The argument “6” is a string."

That’s odd because for me

  \ctxlua{test("\macroI")}

results in

  The argument “6” is a positive number.

and

  \ctxlua{test("\\macroI")}

in

  The argument “6” is a string.

Wolfgang

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___________________________________________________________________________________

Re: Finding values ​​of the context macros inside Lua functions (=expansion inside Lua functions?)

[Jaroslav Hajtmar]

Wolfgang,
Me too. This is because the parameter '\macroI' is evaluated as a 
number, but the parameter '\\macroI' is in fact really a string - the 
name of a context macro. context (...) command properly put correctly 
content of the  '\macroI' macro into the ConTeXt, but without knowledge 
of his contents ...

If you write that:

>  Not possible.


then it's not for me very good news, because I thus probably not my 
module to process only at the Lua language ...


Thanx Jaroslav...




Dne 17.7.2011 14:53, Wolfgang Schuster napsal(a):
> Am 17.07.2011 um 14:42 schrieb Jaroslav Hajtmar:
>
>    
>> Thanx Wolfgang.
>> But I guess I was wrong to express..
>>
>> I need to pass parameter  '\\macroI' to the function  and turn it up a inside luafunction  expand to its value.
>>      
> Not possible.
>
>    
>> Ie when \def\macroI{6}
>>
>> Then I need when I make in your example \ctxlua{test("\\macroI")} get the result :
>> "The argument “6” is a positive number" and not result "The argument “6” is a string."
>>      
> That’s odd because for me
>
>    \ctxlua{test("\macroI")}
>
> results in
>
>    The argument “6” is a positive number.
>
> and
>
>    \ctxlua{test("\\macroI")}
>
> in
>
>    The argument “6” is a string.
>
> Wolfgang
>
>
>    

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___________________________________________________________________________________

Re: Finding values ​​of the context macros inside Lua functions (=expansion inside Lua functions?)

[Wolfgang Schuster]

Am 17.07.2011 um 15:10 schrieb Jaroslav Hajtmar:

> then it's not for me very good news, because I thus probably not my module to process only at the Lua language ...


You can’t expand macro from Lua but the following is possible:

\startluacode

values = {
	I  = "1",
	II = "2",
}

function test(arg)
	if string.find(arg,"\\macro") then
		arg = string.gsub(arg,"\\macro","")
		if values[arg] then
			context(values[arg])
		else
			context("Invalid index.")
		end
	else
		context("Invalid command.")
	end
end

\stopluacode

\starttext

\starttabulate
\NC \type{\macroI}   \EQ \ctxlua{test("\\macroI")}   \NC\NR
\NC \type{\macroII}  \EQ \ctxlua{test("\\macroII")}  \NC\NR
\NC \type{\macroIII} \EQ \ctxlua{test("\\macroIII")} \NC\NR
\NC \type{\foo}      \EQ \ctxlua{test("\\foo")}      \NC\NR
\stoptabulate

\stoptext

Wolfgang

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___________________________________________________________________________________

Re: Finding values ​​of the context macros inside Lua functions (=expansion inside Lua functions?)

[Jaroslav Hajtmar]

Thanx Wolfgang.
It is a good example, which I will definitely come in handy sometimes, 
but unfortunately I can not help my problem to solve.

Once again, many thanks

Jaroslav


Dne 17.7.2011 15:40, Wolfgang Schuster napsal(a):
> You can’t expand macro from Lua but the following is possible:
>
> \startluacode
>
> values = {
> 	I  = "1",
> 	II = "2",
> }
>
> function test(arg)
> 	if string.find(arg,"\\macro") then
> 		arg = string.gsub(arg,"\\macro","")
> 		if values[arg] then
> 			context(values[arg])
> 		else
> 			context("Invalid index.")
> 		end
> 	else
> 		context("Invalid command.")
> 	end
> end
>
> \stopluacode
>
> \starttext
>
> \starttabulate
> \NC \type{\macroI}   \EQ \ctxlua{test("\\macroI")}   \NC\NR
> \NC \type{\macroII}  \EQ \ctxlua{test("\\macroII")}  \NC\NR
> \NC \type{\macroIII} \EQ \ctxlua{test("\\macroIII")} \NC\NR
> \NC \type{\foo}      \EQ \ctxlua{test("\\foo")}      \NC\NR
> \stoptabulate
>
> \stoptext
>
> Wolfgang
>
>    

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