Re: How to tell an Inlines object from a table in a Lua filter?

[BPJ <bpj-J3H7GcXPSITLoDKTGw+V6w@public.gmane.org>]

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You can use the pandoc.utils.type() function. It will return a string
'Inlines' for an Inlines object but 'table' for a regular table.

Unfortunately metadata mappings are now represented as regular tables so
you may have to check whether a regular table is an array or a mapping. I
usually do that with a function like this:

``````lua
local function is_map (val)
  if 'table' == pandoc.utils.type(val) then
    if 0 == #val then
      if next(val) then return true end
    end
  end
  return false
end
``````


Den tis 24 maj 2022 08:50Shane Liesegang <liesegang-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> skrev:

> I've figured out a workaround, but just wondering if there's a better way
> than diving into the metatables:
>
> ~~~
> function fix_table_strings(t)
>   for k, v in pairs(t) do
>     if type(v) == "table" then
>       local metatable = getmetatable(v)
>       if metatable ~= nil and metatable.__name == "Inlines" then
>         t[k] = pandoc.utils.stringify(v)
>       else
>         fix_table_strings(t[k])
>       end
>     end
>   end
> end
> ~~~
>
> On Tuesday, May 24, 2022 at 9:30:41 AM UTC+3 Shane Liesegang wrote:
>
>> Is there a way to tell whether a given object is a pandoc.Inlines as
>> opposed to a plain Lua table? When I call `type(obj)` on it, it just
>> returns "table." I note that if I print it, it shows "Inlines:" instead of
>> "table:" but is there any smarter way to determine?
>>
>> I see some code in the Lua filters example repository
>> <https://github.com/pandoc/lua-filters/blob/03c0fef0e56274ec9c958cdfe508a20618a1b623/scholarly-metadata/scholarly-metadata.lua#L45>
>> that does this kind of check, but I don't know if it's crucial to that code
>> or not, if something has changed recently, etc.
>>
>> (My use case here is walking through my Meta object and building
>> something that will get passed to different functions -- if it encounters a
>> nested table of data, I need to recurse, but if it's an Inlines object, I
>> want to stringify it.)
>>
>> --
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