Re: Filters in Lua vs in Haskell

[Oliver <news-WPTjrydoUPgeaOpM6FAJmQkbCANdLtlA@public.gmane.org>]

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Thanks for the pointer, John.

 From this one data point, the JSON overhead seems to be *quite* 
substantial.

I guess I will look into Lua filters then…

Leo

On 31 May 2023, at 8:53, John MacFarlane wrote:

> See the chart at the beginning of the Lua filters documentation for 
> one data point.
>
>
>> On May 30, 2023, at 3:46 PM, Oliver <news-WPTjrydoUPgeaOpM6FAJmQkbCANdLtlA@public.gmane.org> 
>> wrote:
>>
>> Thanks for this, John.
>>
>> Do you know, is the performance hit big? Or nothing really to worry?
>>
>> Regards,
>> Olli
>>
>> On 30 May 2023, at 4:18, John MacFarlane wrote:
>>
>>> Because JSON filters involve serializing the Haskell data structure 
>>> to JSON, then decoding that back to a Haskell data structure, 
>>> modifying it, encoding it to JSON, and decoding it back.  The Lua 
>>> interface avoids all of this serialization/deserialization.
>>>
>>>> On May 29, 2023, at 12:46 AM, oliver <news-WPTjrydoUPgeaOpM6FAJmQkbCANdLtlA@public.gmane.org> 
>>>> wrote:
>>>>
>>>> Hi there
>>>>
>>>> The doco says Lua filters “are usually faster than JSON 
>>>> filters” and from my understanding Haskell filters are JSON 
>>>> filters.
>>>>
>>>> So why are filters in Pandoc’s “native” language slower than 
>>>> filters in Lua?
>>>>
>>>> Thanks for clarification!
>>>> Olli
>>>>
>>>> On 29 May 2023, at 11:03, Michael Milton wrote:
>>>>
>>>> I just tried to render a PowerPoint presentation from markdown. 
>>>> However the template I used is a bit odd, and I noticed that my 
>>>> title slide was not populated with text, whereas the regular slides 
>>>> were. I wonder if someone could explain the logic that Pandoc uses 
>>>> to find a text box to insert text into? Is there a way to modify my 
>>>> template to avoid these issues? --
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