Re: Lua filter to fix incorrectly nested lists?

[Julien Dutant <julien.dutant-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

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From my labelled-lists filter 
(https://github.com/dialoa/dialectica-filters/blob/main/labelled-lists/labelled-lists.lua), 
here is a filter + function that checks whether every item in a bullet list 
starts with a Span element. 

```lua 

--- is_custom_labelled_list: Look for custom labels markup 
-- Custom label markup requires each item starting with a span 
-- containing the label 
-- @param element pandoc BulletList element 
function is_custom_labelled_list (element) 
   local is_cl_list = true 

   -- the content of BulletList is a List of List of Blocks 
   for _,blocks in ipairs(element.c) do 
      -- check that the first element of the first block is Span 
      if not( blocks[1].c[1].t == 'Span' ) then 
         is_cl_list = false  
         break   
     end 
    end 
   return is_cl_list 

end

return {{ 
BulletList = function(element) 
if is_custom_labelled_list(element) then 
return pandoc.Para(pandoc.Str('Was a list of the required kind!)))
end 
end, }}

```

The difficulty with manipulating lists is to follow their intricate 
structure: a BulletList element as a content (element.c) that is a pandoc 
List. Each item in it (element.c[1], element.c[2]) is of Blocks type, i.e. 
a pandoc.List where the each element is a block. In your case you should 
check that the list item only contains one block of type ordered list:

if #elem.c[i] == 1 then list_item_contains_one_block_only = true end

and check that this block is of type OrderedList:
if #elem.c[i]==1 and elem.c[i].t == 'OrderedList' then ...

you should then add that block to the previous item, and remove the current 
item.

Hope this helps,

J

On Saturday, February 25, 2023 at 10:06:45 PM UTC JDTS wrote:

> Thanks.  Any pointers to lua filters that do something similar?
>
> On Saturday, February 25, 2023 at 10:01:08 AM UTC-5 Julien Dutant wrote:
>
>> Looks feasible. Pandoc converts the first html to:
>>
>> [ BulletList
>>     [ [ Plain
>>           [ ... Inlines ]
>>       ]
>>     , [ BulletList
>>           [ [ Plain
>>                 [ ... Inlines ]
>>             ]
>>           , [ Plain
>>                 [ ... Inlines  ]
>>             ]
>>           ]
>>       ]
>>     , [ Plain
>>           [ Inlines ]
>>       ]
>>     ]
>> ]
>>
>> I.e., the sublist is converted to its own list item. So the filter should 
>> pick up list, check if any item within them consists of a lone sublist, and 
>> if so, move it to the previous item. (And best, apply the filter 
>> recursively to that sublist itself.)
>>
>> On Saturday, February 25, 2023 at 2:26:04 PM UTC JDTS wrote:
>>
>>> The Apple Notes app produces (via AppleScript) HTML for notes with 
>>> nested lists structured like:
>>>
>>> <ul>
>>>
>>> <li>Level 1 element 1</li>
>>>
>>> <ul>
>>>
>>> <li>Level 2 element 1</li>
>>>
>>> <li>Level 2 element 2</li>
>>>
>>> </ul>
>>>
>>> <li>Level 1 element 2</li>
>>>
>>> </ul>
>>>
>>> As you can see, the sublist is incorrectly positioned.  It should be 
>>> positioned *within* the <li> Level 1 element 1 item, ala:
>>>
>>> <ul>
>>>
>>> <li>Level 1 element 1
>>>
>>>     <ul>
>>>
>>>     <li>Level 2 element 1</li>
>>>
>>>     <li>Level 2 element 2</li>
>>>
>>>     </ul>
>>>
>>> </li>
>>>
>>> <li>Level 1 element 2</li>
>>>
>>> </ul>
>>>
>>> Is there a straightforward way with Lua filters to fix this at the AST 
>>> level, for arbitrary-depth sublist nesting?
>>>
>>

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