Last version standalone ConTeXt issue.

Last version standalone ConTeXt issue.

[Jaroslav Hajtmar]

Hello ConTeXist.

In the latest version ConTeXt it stopped working my macros which 
contents function  he once advised me Taco. It is low level lua code. 
Can anyone advise me what the problem is, eventually. how to replace Lua 
code in my function to make it work again? Macros worked at least 6 
years and now crashes.

Here is my function:

function thirddata.handlecsv.texmacroisdefined(macroname) -- check 
whether macroname macro is defined  in ConTeXt
-- function is used to test whether the user has defined the macro 
\macroname. If not, it needs to define any default value
     if token.csname_name(token.create(macroname)) == macroname then
         return true
      else
         return false
     end
end

Is there any alternative (ConTeXt like), which is should be possible use 
in Lua code?

Thanx
Jaroslav Hajtmar


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Re: Last version standalone ConTeXt issue.

[Hans Hagen]

On 2/9/2016 1:28 PM, Jaroslav Hajtmar wrote:
> Hello ConTeXist.
>
> In the latest version ConTeXt it stopped working my macros which
> contents function  he once advised me Taco. It is low level lua code.
> Can anyone advise me what the problem is, eventually. how to replace Lua
> code in my function to make it work again? Macros worked at least 6
> years and now crashes.
>
> Here is my function:
>
> function thirddata.handlecsv.texmacroisdefined(macroname) -- check
> whether macroname macro is defined  in ConTeXt
> -- function is used to test whether the user has defined the macro
> \macroname. If not, it needs to define any default value
>      if token.csname_name(token.create(macroname)) == macroname then
>          return true
>       else
>          return false
>      end
> end
>
> Is there any alternative (ConTeXt like), which is should be possible use
> in Lua code?

\starttext

\startluacode

function interfaces.defined(name)
     return token.get_cmdname(token.create(name)) ~= "undefined_cs"
end

if interfaces.defined("foo") then
     context("foo")
else
     interfaces.setmacro("foo","bar")
end

\stopluacode

\foo

\stoptext

I'll add interfaces.defined to the core.

-----------------------------------------------------------------
                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
       tel: 038 477 53 69 | www.pragma-ade.com | www.pragma-pod.nl
-----------------------------------------------------------------
___________________________________________________________________________________
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: Last version standalone ConTeXt issue.

[Jaroslav Hajtmar]

Thanx Hans.
Great! It works fine now! For me it is very useful and important macro.
One more thanx for reply.

Jaroslav Hajtmar



Dne 09.02.16 v 19:50 Hans Hagen napsal(a):
> On 2/9/2016 1:28 PM, Jaroslav Hajtmar wrote:
>> Hello ConTeXist.
>>
>> In the latest version ConTeXt it stopped working my macros which
>> contents function  he once advised me Taco. It is low level lua code.
>> Can anyone advise me what the problem is, eventually. how to replace Lua
>> code in my function to make it work again? Macros worked at least 6
>> years and now crashes.
>>
>> Here is my function:
>>
>> function thirddata.handlecsv.texmacroisdefined(macroname) -- check
>> whether macroname macro is defined  in ConTeXt
>> -- function is used to test whether the user has defined the macro
>> \macroname. If not, it needs to define any default value
>>      if token.csname_name(token.create(macroname)) == macroname then
>>          return true
>>       else
>>          return false
>>      end
>> end
>>
>> Is there any alternative (ConTeXt like), which is should be possible use
>> in Lua code?
>
> \starttext
>
> \startluacode
>
> function interfaces.defined(name)
>     return token.get_cmdname(token.create(name)) ~= "undefined_cs"
> end
>
> if interfaces.defined("foo") then
>     context("foo")
> else
>     interfaces.setmacro("foo","bar")
> end
>
> \stopluacode
>
> \foo
>
> \stoptext
>
> I'll add interfaces.defined to the core.
>
> -----------------------------------------------------------------
>                                           Hans Hagen | PRAGMA ADE
>               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
>       tel: 038 477 53 69 | www.pragma-ade.com | www.pragma-pod.nl
> -----------------------------------------------------------------
> ___________________________________________________________________________________ 
>
> 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
> ___________________________________________________________________________________

___________________________________________________________________________________
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: Last version standalone ConTeXt issue.

[Meer, Hans van der]

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This is an interesting feature for handling a call to an undefined macro (as might result from \csnam#1\endcsname, for example.

>
> \starttext
>
> \startluacode
>
> function interfaces.defined(name)
>    return token.get_cmdname(token.create(name)) ~= "undefined_cs"
> end
>
> if interfaces.defined("foo") then
>    context("foo")
> else
>    interfaces.setmacro("foo","bar")
> end
>
> \stopluacode
>
> \foo
>
> \stoptext
>
> I'll add interfaces.defined to the core.
>
> -----------------------------------------------------------------
>                                          Hans Hagen | PRAGMA ADE
>              Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
>      tel: 038 477 53 69 | www.pragma-ade.com<http://www.pragma-ade.com> | www.pragma-pod.nl<http://www.pragma-pod.nl>
> -----------------------------------------------------------------

As an example I executed the following code:

\starttext
\framed{\ConTeXt-version = \contextversion}\blank

\def\nofoo{This is nofoo}
\startluacode
if interfaces.defined("foo") then
   context("foo")
else
   interfaces.setmacro("foo","nofoo")
end
\stopluacode
\tex{foo} is undefined: "\foo"\crlf
\def\foo{This is foo}
\tex{foo} is defined: "\foo"\crlf
\stoptext

The result of the first call to \foo, however, is not "This is nofoo" but the name of the nofoo macro. I expected that \nofoo would have been executed instead. That would have been beneficial, because the missing macro \foo can then be substituted for something the programmer thinks useful.
Is this correct? Or am I doing something wrong?

Hans van der Meer




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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
___________________________________________________________________________________