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Re: Troubles in Regular Expression Paradise
From: |
Nicolas Richard |
Subject: |
Re: Troubles in Regular Expression Paradise |
Date: |
Wed, 14 May 2014 14:40:05 +0200 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/24.3.91 (gnu/linux) |
Len Blanks <ltb@haruspex.net> writes:
> I'm trying to parse an xml file containing information for a song "currently
> playing"
> on my iTunes - specifically the artist, name of the tune and the CD in
> appears on.
> and here is a function I had hoped would strip the relevant fields and return
> a string in
> the form: "_artist_'s _title_ from the CD _album_" to be inserted in a
> X-NOW-PLAYING:
> header in emails and usenet posts:
The regexp question was answered, so I allow myself to mention
libxml-parse-xml-region instead of regexps for parsing xml.
First eval:
(setq yftest (libxml-parse-html-region (point-min) (point-max)))
in a buffer which holds your file.
Then you can get away with:
(caddr (assoc 'title (caddr yftest)))
(caddr (assoc 'artist (caddr yftest)))
(caddr (assoc 'album (caddr yftest)))
to get the title, artist and album respectively.
As a side note, I wrote some elisp for using the kind of data that
libxml-parse-html-region spits out, so here's my way of solving your
problem with my code :
(require 'tree-html)
;; https://github.com/YoungFrog/tree-html/blob/master/tree-html.el
(defun yf/get-value-for-sole-subtree-with-given-tag (tree tag)
"Assume there's exactly one XML element with given TAG in TREE, and return its
associated value."
(yf/tree-html-get-value
(yf/tree-html-get-sole-element
(yf/tree-html-select
tree
(lambda (tree)
(eq tag (yf/tree-html-get-tag tree)))))))
(format "%s's %s from the CD %s"
(yf/get-value-for-sole-subtree-with-given-tag yftest 'artist)
(yf/get-value-for-sole-subtree-with-given-tag yftest 'title)
(yf/get-value-for-sole-subtree-with-given-tag yftest 'album))
(Yes, I'm *that* bad at naming things.)
HTH,
--
Nico.