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

[Eric Schulte <schulte.eric@gmail.com>]

Nicolas Goaziou <n.goaziou@gmail.com> writes:

> Eric Schulte <schulte.eric@gmail.com> 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.
>

Point made :), I concede a huge difference between block types.

I'm ultimately happy that the begin_property approach has not moved
forward.

Best -- Eric

-- 
Eric Schulte
http://cs.unm.edu/~eschulte/