Re: Filters in Lua vs in Haskell

[John MacFarlane <fiddlosopher-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

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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