Testing non-existent counter in Lua

Testing non-existent counter in Lua

[Jaroslav Hajtmar]

Hi, all.

How do I know (due Lua) that the counter has not been defined in ConTeXt 
(through the command newcount)?

I am trying testing :

if tex.count.mycount == nil then...

or

if tex.count.mycount == 'error' then...

then when counter isnt defined due \newcount\mycount, then test ending 
with error message.

When counter is defined due
\newcount\mycount,
\mycount=1

then test
if tex.count.mycount == 1 then...

is OK...


Thanx, Jaroslav







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Re: Testing non-existent counter in Lua

[Taco Hoekwater]

Jaroslav Hajtmar wrote:
> Hi, all.
> 
> How do I know (due Lua) that the counter has not been defined in ConTeXt 
> (through the command newcount)?
> 
> I am trying testing :
> 
> if tex.count.mycount == nil then...
> 
> or
> 
> if tex.count.mycount == 'error' then...
> 
> then when counter isnt defined due \newcount\mycount, then test ending 
> with error message.
> 
> When counter is defined due
> \newcount\mycount,
> \mycount=1
> 
> then test
> if tex.count.mycount == 1 then...

if token.command_name(token.create('mycount')) == 'assign_int'
    and tex.count.mycount == 1 then
    ...
end

Best wishes,
Taco

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___________________________________________________________________________________

Re: Testing non-existent counter in Lua

[Jaroslav Hajtmar]

Thanx Taco,
can I learn about these things somewhere read more? I tried 
luatexref-t.pdf and I didnt in fact guided.

Thanx Jaroslav


Dne 22.6.2010 7:55, Taco Hoekwater napsal(a):
> Jaroslav Hajtmar wrote:
>> Hi, all.
>>
>> How do I know (due Lua) that the counter has not been defined in 
>> ConTeXt (through the command newcount)?
>>
>> I am trying testing :
>>
>> if tex.count.mycount == nil then...
>>
>> or
>>
>> if tex.count.mycount == 'error' then...
>>
>> then when counter isnt defined due \newcount\mycount, then test 
>> ending with error message.
>>
>> When counter is defined due
>> \newcount\mycount,
>> \mycount=1
>>
>> then test
>> if tex.count.mycount == 1 then...
>
> if token.command_name(token.create('mycount')) == 'assign_int'
>    and tex.count.mycount == 1 then
>    ...
> end
>
> Best wishes,
> Taco
>
>

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___________________________________________________________________________________

Re: Testing non-existent counter in Lua

[Taco Hoekwater]

Jaroslav Hajtmar wrote:
> Thanx Taco,
> can I learn about these things somewhere read more? I tried
> luatexref-t.pdf and I didnt in fact guided.

It is in there, but as it goes in reference manuals, you have
to know what to look for. At this moment, there are no tutorials
or something like that about the token interface (mostly because
I am not quite happy with how it works right now).

Best wishes,
Taco

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