From: Nicolas Goaziou <n.goaziou@gmail.com>
To: Vitalie Spinu <spinuvit@gmail.com>
Cc: emacs-orgmode@gnu.org
Subject: Re: org-export: how to copy the parsed tree?
Date: Sat, 01 Mar 2014 22:02:55 +0100 [thread overview]
Message-ID: <878ustpr7k.fsf@gmail.com> (raw)
In-Reply-To: <87ob1pepzh.fsf@gmail.com> (Vitalie Spinu's message of "Sat, 01 Mar 2014 10:24:50 -0800")
Vitalie Spinu <spinuvit@gmail.com> writes:
> Thanks Nocolas. I need to copy only a subtree associated with a
> headline. In a nutshell I need to "flatten" the tree of headlines for
> the csv type exporter. That is, I need to replicate the parent headlines
> across the children. For example
>
> * H1
> bla bla
> ** HA
> some text
> ** HB
> some other text
>
> would translate into
>
> * H1
> bla bla
> ** HA
> some text
> * H1
> bla bla
> ** HB
> some other text
>
> I played with org-element-extract-element, org-element-set-contents and
> org-element-insert-before but failed a big deal.
In this case, I think I would build the tree, since data is duplicated
(e.g. "* H1"), not moved.
> Main problem seems to be the lack of uniform interface to handle parents
> in connection to secondary elements (which I don't understand at this
> point).
There is no such thing as "secondary elements". I think you mean
"secondary strings". This is some parsed data that doesn't belong to the
main hierarchy in the tree.
I don't think any interface problem for :parent property. You simply use
`org-element-property' and `org-element-put-property'.
> Is headline a secondary element?
No. A headline is a full-fledged element. But, besides its contents, it
contains additional data (its title) which is Org syntax and therefore
qualifies as a secondary string.
> The :parent seems to be stored in 2 places for the headline, in the
> headline itself and in the :title.
You are wrong. Headline's parent is stored only in the :parent property
of the headline. You get it with:
(org-element-property :parent headline)
Within `:title', `:parent' property refers to the parent of the objects
contained in :title, which is the headline itself:
(eq (org-element-property :parent
;; The first object in the :title property.
(car (org-element-property :title headline)))
headline) => t
There is only one parent per object/element/string.
> Most of the org code uses org-element-put-property and
> org-element-property to access the parent but some code like
> org-element-extract-element uses :parent from :title.
`org-element-extract-element' checks if the element/object you're
removing belong to a secondary string or to the contents of the current
element.
Moreover, this function removes the :parent property, so you shouldn't
bother about where it came from.
> This makes it difficult to program as there are no explicit
> getter/setter for the parent.
See above.
> BTW, is there a way to pretty print the org tree? I think that's the
> main barrier for me in understanding how it all works.
Use `pp' and set both `print-level' and `print-circle' accordingly.
Regards,
--
Nicolas Goaziou
next prev parent reply other threads:[~2014-03-01 21:02 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-03-01 1:20 org-export: how to copy the parsed tree? Vitalie Spinu
2014-03-01 8:45 ` Thorsten Jolitz
2014-03-01 10:21 ` Thorsten Jolitz
2014-03-01 11:36 ` Nicolas Goaziou
2014-03-01 18:24 ` Vitalie Spinu
2014-03-01 21:02 ` Nicolas Goaziou [this message]
2014-03-01 21:21 ` Vitalie Spinu
2014-03-02 9:13 ` Nicolas Goaziou
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