Re: official orgmode parser

[Ihor Radchenko <yantar92@gmail.com>]

FYI: You may find https://github.com/ndwarshuis/org-ml helpful.


Przemysław Kamiński <pk@intrepidus.pl> writes:

> On 9/15/20 2:37 PM, tomas@tuxteam.de wrote:
>> On Tue, Sep 15, 2020 at 01:15:56PM +0200, Przemysław Kamiński wrote:
>> 
>> [...]
>> 
>>> There's the org-json (or ox-json) package but for some reason I
>>> wasn't able to run it successfully. I guess export to S-exps would
>>> be best here. But yes I'll check that out.
>> 
>> If that's your route, perhaps the "Org element API" [1] might be
>> helpful. Especially `org-element-parse-buffer' gives you a Lisp
>> data structure which is supposed to be a parse of your Org buffer.
>> 
>>  From there to S-expression can be trivial (e.g. `print' or `pp'),
>> depending on what you want to do.
>> 
>> Walking the structure should be nice in Lisp, too.
>> 
>> The topic of (non-Emacs) parsing of Org comes up regularly, and
>> there is a good (but AFAIK not-quite-complete) Org syntax spec
>> in Worg [2], but there are a couple of difficulties to be mastered
>> before such a thing can become really enjoyable and useful.
>> 
>> The loose specification of Org's format (arguably its second
>> or third strongest asset, the first two being its incredible
>> community and Emacs itself) is something which makes this
>> problem "interesting". People have invented lots of usages
>> which might be broken should Org change to a strict formal
>> spec. You don't want to break those people.
>> 
>> But yes, perhaps some day someone nails it. Perhaps it's you :)
>> 
>> Cheers
>> 
>> [1] https://orgmode.org/worg/dev/org-element-api.html
>> [2] https://orgmode.org/worg/dev/org-syntax.html
>> 
>>   - t
>> 
>
> So I looked at (pp (org-element-parse-buffer)) however it does print out 
> recursive stuff which other schemes have trouble parsing.
>
> My code looks more or less like this:
>
> (defun org-parse (f)
>    (with-temp-buffer
>      (find-file f)
>      (let* ((parsed (org-element-parse-buffer))
>             (all (append org-element-all-elements org-element-all-objects))
>             (mapped (org-element-map parsed all
>                       (lambda (item)
>                         (strip-parent item)))))
>        (pp mapped))))
>
>
> strip-parent is basically (plist-put props :parent nil) for elements 
> properties. However it turns out there are more recursive objects, like
>
> :title
>            #("Headline 1" 0 10
>              (:parent
>               (headline #2
>                             (section
>
> So I'm wondering do I have to do it by hand for all cases or is there 
> some way to output only a simple AST without those nested objects?
>
> Best,
> Przemek