subject:"Re\: \[NTG\-context\] Checking existence of a macro \(control sequence\) by Lua \- problem after updating MkIV"

Re: [NTG-context] Checking existence of a macro (control sequence) by Lua - problem after updating MkIV

2020-06-19 Thread Lukas/ConTeXt

Hello Hans,

-- Původní e-mail -- {
Od: Hans Hagen 

as you updated, it's just:

   \startluacode
 local defined = tokens.defined
 for _, v in ipairs{ "MyMacro", "MyMacWithPars", "Undefined", "DoNothing", 
"NonExisting" } do
   print(string.format("\letterpercent-12s", v), defined(v), defined(v, 
true), defined(v, false))
 end
   \stopluacode
-- Původní e-mail -- }

your solution gives me:

"
MyMacro false   truefalse
MyMacWithPars   false   truefalse
Undefined   false   truefalse
DoNothing   false   truefalse
NonExisting false   false   false
"
which desn't recognize \Undefined - it should give 'false' in the 2nd column of 
results, like \NonExisting does.

But I have another solution (asked in Czech TUG) - use of 
'token.get_meaning(cs)': 

  \startluacode
for _, v in ipairs{ "MyMacro", "MyMacWithPars", "Undefined", "DoNothing", 
"NonExisting" } do
  print(string.format("\letterpercent-12s", v), "get_meaning", 
token.get_meaning(v) or "(non-existing/undefined)")
end
  \stopluacode


- Produces:

"
MyMacro get_meaning ->Ahoj
MyMacWithPars   get_meaning #1#2->Something
Undefined   get_meaning (non-existing/undefined)
DoNothing   get_meaning ->
NonExisting get_meaning (non-existing/undefined)
"
which is perfectly what I need.

But thank you anyway for your effort.

Best regards,

Lukas
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Re: [NTG-context] Checking existence of a macro (control sequence) by Lua - problem after updating MkIV

2020-06-18 Thread Hans Hagen


On 6/18/2020 10:27 AM, Lukas/ConTeXt wrote:

Hello,
I'm using Hans' macro suggested some time before.
I've just updated Ctx MkIV and my sample code:


\starttext
   \def\MyMacro{Ahoj}

   \def\MyMacWithPars#1#2{Something}

   \def\Undefined{}
   \let\Undefined\undefined

   \def\DoNothing{}
   \let\DoNothing\donothing

   \startluacode
 if CONTEXTLMTXMODE == 0 then
 local d = tokens.defined
 local c = tokens.create

 function tokens.defined(s,b)
 if b then
 return d(s)
 else
 return c(s).cmd_name == "undefined_cmd"
 end
 end
 end

 --

 local defined = tokens.defined

 for _, v in ipairs{ "MyMacro", "MyMacWithPars", "Undefined", "DoNothing", 
"NonExisting" } do
   print(string.format("\letterpercent-12s", v), defined(v), defined(v, 
true), defined(v, false))
 end
   \stopluacode

   Aaa
\stoptext

as you updated, it's just:

  \startluacode
local defined = tokens.defined

for _, v in ipairs{ "MyMacro", "MyMacWithPars", "Undefined", 
"DoNothing", "NonExisting" } do
  print(string.format("\letterpercent-12s", v), defined(v), 
defined(v, true), defined(v, false))

end
  \stopluacode


-
  Hans Hagen | PRAGMA ADE
  Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
   tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
-
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Re: [NTG-context] Checking existence of a macro (control sequence) by Lua - problem after updating MkIV

2020-06-18 Thread Lukas/ConTeXt


Hello,




I need to check within Lua.

My sample cases are very minimalistic - I'm working on more complicated task
actually, where check-for-control-sequence-existence need to be performed 
run-time within Lua scope.




Best,




Lukas



-- Původní e-mail --
Od: Hans van der Meer 
Komu: NTG ConTeXt 
Datum: 18. 6. 2020 12:25:42
Předmět: Re: [NTG-context] Checking existence of a macro (control sequence)
by Lua - problem after updating MkIV
"
Why can you not simply use one of the doifundefined macro's? Something for
example:


\doifundefined{ExitStatus}{\gdef\ExitStatus{0}} % default to ok as in UNIX




dr. Hans van der Meer









"
On 18 Jun 2020, at 10:27, Lukas/ConTeXt mailto:lpr.cont...@email.cz)> wrote:



Hello,
I'm using Hans' macro suggested some time before.
I've just updated Ctx MkIV and my sample code:


\starttext
 \def\MyMacro{Ahoj}

  \def\MyMacWithPars#1#2{Something}

  \def\Undefined{}
  \let\Undefined\undefined

  \def\DoNothing{}
  \let\DoNothing\donothing

  \startluacode
    if CONTEXTLMTXMODE == 0 then
   local d = tokens.defined
   local c = tokens.create

   function tokens.defined(s,b)
   if b then
   return d(s)
   else
    return c(s).cmd_name == "undefined_cmd"
   end
    end
    end

    --

    local defined = tokens.defined

   for _, v in ipairs{ "MyMacro", "MyMacWithPars", "Undefined", "DoNothing",
"NonExisting" } do
 print(string.format("\letterpercent-12s", v), defined(v), defined(v,
true), defined(v, false))
   end
  \stopluacode

  Aaa
\stoptext


gives:
"
MyMacro false   false   false
MyMacWithPars   false   false   false
Undefined   false   false   false
DoNothing   false   false   false
NonExisting false   false   false
"

IOW, I'm not able to determine whether a control sequence has not been
defined (or has \undefined value) or not.

Am I doing a trivial mistake or has anything changed?

Thank you for patience...

Lukas
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"


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context
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Re: [NTG-context] Checking existence of a macro (control sequence) by Lua - problem after updating MkIV

2020-06-18 Thread Hans van der Meer

Why can you not simply use one of the doifundefined macro's? Something for 
example:
\doifundefined{ExitStatus}{\gdef\ExitStatus{0}} % default to ok as in UNIX

dr. Hans van der Meer


> On 18 Jun 2020, at 10:27, Lukas/ConTeXt  wrote:
> 
> Hello,
> I'm using Hans' macro suggested some time before.
> I've just updated Ctx MkIV and my sample code:
> 
> 
> \starttext
>  \def\MyMacro{Ahoj}
> 
>  \def\MyMacWithPars#1#2{Something}
> 
>  \def\Undefined{}
>  \let\Undefined\undefined
> 
>  \def\DoNothing{}
>  \let\DoNothing\donothing
> 
>  \startluacode
>if CONTEXTLMTXMODE == 0 then
>local d = tokens.defined
>local c = tokens.create
> 
>function tokens.defined(s,b)
>if b then
>return d(s)
>else
>return c(s).cmd_name == "undefined_cmd"
>end
>end
>end
> 
>--
> 
>local defined = tokens.defined
> 
>for _, v in ipairs{ "MyMacro", "MyMacWithPars", "Undefined", "DoNothing", 
> "NonExisting" } do
>  print(string.format("\letterpercent-12s", v), defined(v), defined(v, 
> true), defined(v, false))
>end
>  \stopluacode
> 
>  Aaa
> \stoptext
> 
> 
> gives:
> "
> MyMacro false   false   false
> MyMacWithPars   false   false   false
> Undefined   false   false   false
> DoNothing   false   false   false
> NonExisting false   false   false
> "
> 
> IOW, I'm not able to determine whether a control sequence has not been 
> defined (or has \undefined value) or not.
> 
> Am I doing a trivial mistake or has anything changed?
> 
> Thank you for patience...
> 
> Lukas___
> 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://context.aanhet.net
> archive  : https://bitbucket.org/phg/context-mirror/commits/
> wiki : http://contextgarden.net
> ___

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Re: [NTG-context] Checking existence of a macro (control sequence) by Lua - problem after updating MkIV

Re: [NTG-context] Checking existence of a macro (control sequence) by Lua - problem after updating MkIV

Re: [NTG-context] Checking existence of a macro (control sequence) by Lua - problem after updating MkIV

Re: [NTG-context] Checking existence of a macro (control sequence) by Lua - problem after updating MkIV

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