Last modified: 2011-03-13 18:05:39 UTC

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Bug 13016 - Anchor encoding is not one-to-one
Anchor encoding is not one-to-one
Product: MediaWiki
Classification: Unclassified
Parser (Other open bugs)
All All
: Lowest enhancement (vote)
: ---
Assigned To: Nobody - You can work on this!
Depends on:
Blocks: html
  Show dependency treegraph
Reported: 2008-02-14 02:12 UTC by Aryeh Gregor (not reading bugmail, please e-mail directly)
Modified: 2011-03-13 18:05 UTC (History)
1 user (show)

See Also:
Web browser: ---
Mobile Platform: ---
Assignee Huggle Beta Tester: ---


Description Aryeh Gregor (not reading bugmail, please e-mail directly) 2008-02-14 02:12:58 UTC
Due to the way we do anchor encoding, there's no way to reliably reverse it.  ".3F", for instance, is translated to ".3F", but so is "?".  And both "_" and " " become "_".  It would be nice if anchor encoding were made reversible to avoid unintended conflicts and permit anchor decoding facilities.

Currently we do, roughly

$id = str_replace( ' ', '_', $id );
$id = Sanitizer::decodeCharReferences( $id );
$id = urlencode( $id );
$id = str_replace( '%3A', ':', $id );
$id = str_replace( '%', '.', $id );

This should be

$id = Sanitizer::decodeCharReferences( $id );
$id = urlencode( $id );
$id = str_replace( '_', '%5F', $id );
$id = str_replace( '.', '%2E', $id );
$id = str_replace( '%20', '_', $id );
$id = str_replace( '%3A', ':', $id );
$id = str_replace( '%', '.', $id );

That could then be reversed reliably (to within entity encoding) with

$id = str_replace( '.', '%', $id );
$id = str_replace( '_', ' ', $id );
$id = urldecode( $id );
Comment 1 Aryeh Gregor (not reading bugmail, please e-mail directly) 2009-01-05 16:04:52 UTC
The new encoding scheme we use is deliberately not one-to-one, so that the anchors look nicer: invalid characters (mostly punctuation) are converted into underscores for prettiness.  WONTFIX.

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