bug#17964: 24.3; xml-print inserts spurious whitespace

bug#17964: 24.3; xml-print inserts spurious whitespace

[Juliusz Chroboczek]

Hi.

I'm trying to use Emacs' XML parser to parse Atom feeds, and I'm finding
that xml-print inserts spurious whitespace in the XHTML content, which
breaks formatting.  Here's a pretty minimal example:

(require 'xml)

(defun xml-parse-from-string (s)
  (with-temp-buffer
    (insert s)
    (xml-parse-region (point-min) (point-max))))

(defun xml-print-to-string (x)
  (with-temp-buffer
    (xml-print x)
    (buffer-substring (point-min) (point-max))))

(xml-print-to-string (xml-parse-from-string "<p>[<a>foo</a>]</p>"))
"<p>[
  <a>foo</a>]
</p>"

bug#17964: 24.3; xml-print inserts spurious whitespace

[Lars Ingebrigtsen]

Juliusz Chroboczek <jch@pps.univ-paris-diderot.fr> writes:

> I'm trying to use Emacs' XML parser to parse Atom feeds, and I'm finding
> that xml-print inserts spurious whitespace in the XHTML content, which
> breaks formatting.  Here's a pretty minimal example:
>
> (require 'xml)
>
> (defun xml-parse-from-string (s)
>   (with-temp-buffer
>     (insert s)
>     (xml-parse-region (point-min) (point-max))))
>
> (defun xml-print-to-string (x)
>   (with-temp-buffer
>     (xml-print x)
>     (buffer-substring (point-min) (point-max))))
>
> (xml-print-to-string (xml-parse-from-string "<p>[<a>foo</a>]</p>"))
> "<p>[
>   <a>foo</a>]
> </p>"

I can confirm that this is still an issue on the Emacs trunk.  However,
our XML reader does not retain information about whitespace (or the lack
of it).  And

<p>[
   <a>foo</a>]
 </p>

is perfectly valid XML.  I don't really think there's a way to "fix"
this, if it's considered a bug, which is kinda isn't.  So I'm closing
this as "wontfix".

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

bug#17964: 24.3; xml-print inserts spurious whitespace

[Ulf Jasper]

Hi Juliusz,

Am 01.03.2016 um 17:14 (+1100) schrieb Lars Ingebrigtsen:
> Juliusz Chroboczek <jch@pps.univ-paris-diderot.fr> writes:
>
>> I'm trying to use Emacs' XML parser to parse Atom feeds, and I'm finding
>> that xml-print inserts spurious whitespace in the XHTML content, which
>> breaks formatting.

[Not directly related to the bug report but maybe helpful:]

'newsticker.el' already does parsing of different Atom and RSS feeds.
Maybe you can re-use some of that functionality.  Please have a look at
newst-backend.el.

Best,
Ulf