Thorsten Jolitz <tjol...@gmail.com> writes: > Hi List, > > I wonder how I can find out in a (elisp) program the points in the parse > tree (returned by org-element-parse-buffer) where shared structures are > used. > > In the read-syntax, its easy to see (especially with `print-circle' set > to non-nil): > > #+begin_src emacs-lisp > #2=(org-data nil #1=(headline (:raw-value "header 1" > [...] :parent #2#) [...] > #+end_src > > but when processing the parse tree as a list in elisp, how can I detect the > fact that > > ,------------ > | :parent #2# > `------------ > > refers to > > ,----------------- > | #2=(org-data nil > `----------------- > > i.e. points back to an already existing structure?
AFAIK you have to track all pointers inspected to see if one has already be seen. For example, I've implemented a version of equal[1] to compare this kind of lists (to add tests to org-sync). [1] https://github.com/daimrod/Emacs-config/blob/master/elisp/dmd-utils.el#L25 -- Daimrod/Greg
signature.asc
Description: PGP signature
