Last modified: 2010-03-18 11:35:58 UTC

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Bug 22866 - {{#ifexpr: (-1)*0 | true | false }} == true
{{#ifexpr: (-1)*0 | true | false }} == true
Status: RESOLVED FIXED
Product: MediaWiki extensions
Classification: Unclassified
ParserFunctions (Other open bugs)
unspecified
All All
: Normal major with 1 vote (vote)
: ---
Assigned To: Nobody - You can work on this!
:
Depends on:
Blocks:
  Show dependency tree / graph
 
Reported: 2010-03-17 18:24 UTC by STyx
Modified: 2010-03-18 11:35 UTC (History)
3 users (show)

See Also:
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Assignee Huggle Beta Tester: ---

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Description STyx 2010-03-17 18:24:28 UTC 
Unexpected results :

    {{#ifexpr: -0 | yes | no }} → no
    {{#ifexpr: 1*0 | yes | no }} → no
    {{#ifexpr: -1*0 | yes | no }} → yes 

See http://www.mediawiki.org/w/index.php?title=Help:Extension:ParserFunctions&diff=310071&oldid=307495
Comment 1 STyx 2010-03-17 18:26:02 UTC 
Maybe related to bug 6356 and Bug 18233 ?
Comment 2 Aryeh Gregor (not reading bugmail, please e-mail directly) 2010-03-17 18:41:03 UTC 
Unlikely.  I don't understand the code well enough to see what's going wrong here, though.  There should never be rounding errors when multiplying by 0, surely?
Comment 3 Platonides 2010-03-17 18:46:58 UTC 
-0 is normalised to 0 but -1*0 is kept as -0, which trigger the yes
Comment 4 Aryeh Gregor (not reading bugmail, please e-mail directly) 2010-03-17 19:15:22 UTC 
Where is this normalization done?  Also, why is -0 a yes?  (bool)(-0) in PHP is false.
Comment 5 Alexandre Emsenhuber [IAlex] 2010-03-18 11:35:58 UTC 
Fixed in r63906.
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