Can not register the callback functions in MkIV

Can not register the callback functions in MkIV

[Yanrui Li]

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Hi,

Now it seems that we have not allowed to register the callback functions
since beta 2010.02.18.

For example:

\startluacode

local old_pre_linebreak_filter = callback.find ('pre_linebreak_filter')

local function my_pre_linebreak_filter (head, groupcode)
    if old_pre_linebreak_filter then
    old_pre_linebreak_filter (head, groupcode)
    end
    print ('This is my pre_linebreak_callback')
    return true
end

callback.register ('pre_linebreak_filter', my_pre_linebreak_filter)

\stopluacode

\starttext

This is just a test!

\stoptext

The 'my_pre_linebreak_filter' function can not work again. Is this a bug?

-- 
Best regards,

Li Yanrui

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Re: Can not register the callback functions in MkIV

[Yanrui Li]

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2010/2/19 Yanrui Li <liyanrui.m2@gmail.com>

> Hi,
>
> Now it seems that we have not allowed to register the callback functions
> since beta 2010.02.18.
>
> For example:
>
> \startluacode
>
> local old_pre_linebreak_filter = callback.find ('pre_linebreak_filter')
>
> local function my_pre_linebreak_filter (head, groupcode)
>     if old_pre_linebreak_filter then
>     old_pre_linebreak_filter (head, groupcode)
>     end
>     print ('This is my pre_linebreak_callback')
>     return true
> end
>
> callback.register ('pre_linebreak_filter', my_pre_linebreak_filter)
>
> \stopluacode
>
> \starttext
>
> This is just a test!
>
> \stoptext
>
> The 'my_pre_linebreak_filter' function can not work again. Is this a bug?
>
> --
> Best regards,
>
> Li Yanrui
>

I see. The 'pre_linebreak_filter' callback function is frozen.

-- 
Best regards,

Li Yanrui

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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
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___________________________________________________________________________________

Re: Can not register the callback functions in MkIV

[Hans Hagen]

On 19-2-2010 13:21, Yanrui Li wrote:
> 2010/2/19 Yanrui Li<liyanrui.m2@gmail.com>
>
>> Hi,
>>
>> Now it seems that we have not allowed to register the callback functions
>> since beta 2010.02.18.
>>
>> For example:
>>
>> \startluacode
>>
>> local old_pre_linebreak_filter = callback.find ('pre_linebreak_filter')
>>
>> local function my_pre_linebreak_filter (head, groupcode)
>>      if old_pre_linebreak_filter then
>>      old_pre_linebreak_filter (head, groupcode)
>>      end
>>      print ('This is my pre_linebreak_callback')
>>      return true
>> end
>>
>> callback.register ('pre_linebreak_filter', my_pre_linebreak_filter)
>>
>> \stopluacode
>>
>> \starttext
>>
>> This is just a test!
>>
>> \stoptext
>>
>> The 'my_pre_linebreak_filter' function can not work again. Is this a bug?
>>
>> --
>> Best regards,
>>
>> Li Yanrui
>>
>
> I see. The 'pre_linebreak_filter' callback function is frozen.

indeed as otherwise you kick out functionality; there are two user hooks:

tasks.appendaction("processors","before","modules.mine.whatever_a")
tasks.appendaction("processors","after","modules.mine.whatever_b")

as it's impossible to forsee what interference happens it will be clear 
that there is no support beyonf this

Hans

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