Re: [O] About commit named "Allow multi-line properties to be specified in property blocks"

[Nicolas Goaziou]

Eric Schulte <address@hidden> writes:

>>> On the contrary, creating a block for each keyword would mean a lot of
>>> new syntax.
>>>
>>> We currently have 8 types of blocks (not counting dynamic blocks, whose
>>> syntax is a bit different), all requiring to be parsed differently:
>>>
>>>   1. Center blocks,
>>>   2. Comment blocks,
>>>   3. Example blocks,
>>>   4. Export blocks,
>>>   5. Quote blocks,
>>>   6. Special blocks,
>>>   7. Src blocks,
>>>   8. Verse blocks.
>>
>> I'm not sure what do you mean by "requiring to be parsed differently".
>> Can you explain it?  I understand they should be treated differently by
>> the exporters, but I don't understand why they would need to be parsed
>> differently.
>>
>
> I also wouldn't think of this as new syntax, I don't see 8 rules for the
> 8 types above but rather one rule along the lines of #+begin_SOMETHING
> where the SOMETHING can be anything.

Well, certainly, from a "Press TAB on #+begin_ line", they have exactly
the same meaning, and could as well be labelled #+begin_SOMETHING. But,

  - If I consider fontification, "Src blocks" differ from "Example
    blocks", which differ from everything else.

  - If I consider `org-edit-special', C-c ' will bring you to a buffer
    with a special mode in "Src blocks", fundamental mode in "Example
    blocks" and "Verse blocks".

  - If I consider lists, you can have them in "Quote blocks", but not in
    "Export blocks" or "Verse blocks", for example.

  - If I consider indentation, it will be ignored for "Example blocks"
    (and should do the same for "Verse blocks"), could do something
    entirely different on "Src blocks", and will indent normally,
    i.e. "Quote blocks".

  - If I consider recursion, you can have "Quote blocks" inside "Center
    blocks", but not inside "Export blocks".

  - If I consider options on the "begin_" line, "Example blocks" accept
    them, but not "Center blocks".

  - If I consider entities, you can have them in "Verse blocks" but not
    in "Example blocks"

  - If I consider export, obviously, they will all be treated very
    differently.

And I'm pretty sure I'm forgetting some other case. So, yes, from the
moon, they're pretty much indistinguishable ;) From an Org point of
view, they have 8 different meanings and, as such, need to be parsed
differently. At least, I've had to proceed that way when I wrote an Org
parser.


Regards,

-- 
Nicolas Goaziou