Why this lua filter function does not work?

Why this lua filter function does not work?

[jiewuza]

Suppose I have a table as the first child in a div.

And here is the function which returns the table, to replace the
original div.

```
function handleDiv(el)
   local table = el.content[1]
   print(table.t, TableToStr(table))
   return table
end
```

Unfortunately, there is no table in the output. No error either.

Re: Why this lua filter function does not work?

[John MacFarlane]

Try with

function Div(el)

jiewuza <jiewuza-9Onoh4P/yGk@public.gmane.org> writes:

> Suppose I have a table as the first child in a div.
>
> And here is the function which returns the table, to replace the
> original div.
>
> ```
> function handleDiv(el)
>    local table = el.content[1]
>    print(table.t, TableToStr(table))
>    return table
> end
> ```
>
> Unfortunately, there is no table in the output. No error either.
>
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Re: Why this lua filter function does not work?

[jiewuza]

Yes, I have `return {{Div = handleDiv}}` at the end of the filter.

I have `print` in the function. So I am sure it was called.


John MacFarlane <jgm-TVLZxgkOlNX2fBVCVOL8/A@public.gmane.org> writes:

> Try with
>
> function Div(el)
>
> jiewuza <jiewuza-9Onoh4P/yGk@public.gmane.org> writes:
>
>> Suppose I have a table as the first child in a div.
>>
>> And here is the function which returns the table, to replace the
>> original div.
>>
>> ```
>> function handleDiv(el)
>>    local table = el.content[1]
>>    print(table.t, TableToStr(table))
>>    return table
>> end
>> ```
>>
>> Unfortunately, there is no table in the output. No error either.
>>
>> -- 
>> You received this message because you are subscribed to the Google Groups "pandoc-discuss" group.
>> To unsubscribe from this group and stop receiving emails from it, send an email to pandoc-discuss+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
>> To view this discussion on the web visit https://groups.google.com/d/msgid/pandoc-discuss/m21rhizo8c.fsf%40163.com.

Re: Why this lua filter function does not work?

[jiewuza]

Yes, I have `return {{Div = handleDiv}}` at the end of the filter.

I have `print` in the function. So I am sure it was called.


John MacFarlane <jgm-TVLZxgkOlNX2fBVCVOL8/A@public.gmane.org> writes:

> Try with
>
> function Div(el)
>
> jiewuza <jiewuza-9Onoh4P/yGk@public.gmane.org> writes:
>
>> Suppose I have a table as the first child in a div.
>>
>> And here is the function which returns the table, to replace the
>> original div.
>>
>> ```
>> function handleDiv(el)
>>    local table = el.content[1]
>>    print(table.t, TableToStr(table))
>>    return table
>> end
>> ```
>>
>> Unfortunately, there is no table in the output. No error either.
>>
>> -- 
>> You received this message because you are subscribed to the Google Groups "pandoc-discuss" group.
>> To unsubscribe from this group and stop receiving emails from it, send an
>> email to
>> pandoc-discuss+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
>> To view this discussion on the web visit https://groups.google.com/d/msgid/pandoc-discuss/m21rhizo8c.fsf%40163.com.

Re: Why this lua filter function does not work?

[John MacFarlane]

Hm.  It ought to work, as far as I can see.  Maybe Albert
Krewinkel can shed some light on this?

jiewuza <jiewuza-9Onoh4P/yGk@public.gmane.org> writes:

> Yes, I have `return {{Div = handleDiv}}` at the end of the filter.
>
> I have `print` in the function. So I am sure it was called.
>
>
> John MacFarlane <jgm-TVLZxgkOlNX2fBVCVOL8/A@public.gmane.org> writes:
>
>> Try with
>>
>> function Div(el)
>>
>> jiewuza <jiewuza-9Onoh4P/yGk@public.gmane.org> writes:
>>
>>> Suppose I have a table as the first child in a div.
>>>
>>> And here is the function which returns the table, to replace the
>>> original div.
>>>
>>> ```
>>> function handleDiv(el)
>>>    local table = el.content[1]
>>>    print(table.t, TableToStr(table))
>>>    return table
>>> end
>>> ```
>>>
>>> Unfortunately, there is no table in the output. No error either.
>>>
>>> -- 
>>> You received this message because you are subscribed to the Google Groups "pandoc-discuss" group.
>>> To unsubscribe from this group and stop receiving emails from it, send an
>>> email to
>>> pandoc-discuss+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
>>> To view this discussion on the web visit https://groups.google.com/d/msgid/pandoc-discuss/m21rhizo8c.fsf%40163.com.
>
> -- 
> You received this message because you are subscribed to the Google Groups "pandoc-discuss" group.
> To unsubscribe from this group and stop receiving emails from it, send an email to pandoc-discuss+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
> To view this discussion on the web visit https://groups.google.com/d/msgid/pandoc-discuss/m2k0v9xyn2.fsf%40163.com.

Re: Why this lua filter function does not work?

[Albert Krewinkel]

John MacFarlane writes:

> Hm.  It ought to work, as far as I can see.  Maybe Albert
> Krewinkel can shed some light on this?

Sorry, I cannot spot any obvious problems either.

Could you upload the filter together with a short sample input for
us to reproduce the issue?

--
Albert Krewinkel
GPG: 8eed e3e2 e8c5 6f18 81fe  e836 388d c0b2 1f63 1124

Re: Why this lua filter function does not work?

[jiewuza]

Ooops, I find the problem. It is my fault.

In my real case, there are many function calls. One of them returns empty
list.


p.s. Sorry for the repeated replies for my last two posts.
I don't know why gmane took so long to get them posted. I thought I
might fail to post them, so I tried to post again and again...

Albert Krewinkel <albert+pandoc-9EawChwDxG8hFhg+JK9F0w@public.gmane.org>
writes:

> John MacFarlane writes:
>
>> Hm.  It ought to work, as far as I can see.  Maybe Albert
>> Krewinkel can shed some light on this?
>
> Sorry, I cannot spot any obvious problems either.
>
> Could you upload the filter together with a short sample input for
> us to reproduce the issue?
>
> --
> Albert Krewinkel
> GPG: 8eed e3e2 e8c5 6f18 81fe  e836 388d c0b2 1f63 1124