Re: Parse CSS styles and swap background position value

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From	Thomas 'PointedEars' Lahn <PointedEars@web.de>
Newsgroups	comp.lang.javascript
Subject	Re: Parse CSS styles and swap background position value
Date	Tue, 03 Feb 2015 12:44:56 +0100
Organization	PointedEars Software (PES)
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Thomas 'PointedEars' Lahn wrote:

> […] Again, *iff* you can make sure that *all* percentages in the matched 
> property values relate to horizontal background-position (which usually is 
> _not_ the case: […]), then you could use
> 
>   … = value.replace(/\b(?:(left)|(right)|(\d+)%)\b/gi,
>     function (match, left, right, percentage) {
>       return (left
>         ? "right"
>         : (right ? "left" : (100 - percentage) + "%")));
                                                        ^
>     });
> 
> But this does not work already in the case of
> 
>   background: url(example1.png) repeat-x right 50%;

Bad example :)  It would work here (after the extra parenthesis was 
removed), but only because of 100 − 50 = 50.

-- 
PointedEars
FAQ: <http://PointedEars.de/faq> | SVN: <http://PointedEars.de/wsvn/>
Twitter: @PointedEars2 | ES Matrix: <http://PointedEars.de/es-matrix>
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Thread

Parse CSS styles and swap background position value Cezary Tomczyk <cezary.tomczyk@gmail.com> - 2015-01-31 10:39 -0800
  Re: Parse CSS styles and swap background position value Erwin Moller <erwinmollerusenet@xs4all.nl> - 2015-02-02 13:09 +0100
    Re: Parse CSS styles and swap background position value Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2015-02-02 14:01 +0100
      Re: Parse CSS styles and swap background position value Erwin Moller <erwinmollerusenet@xs4all.nl> - 2015-02-02 14:39 +0100
        Re: Parse CSS styles and swap background position value Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2015-02-02 18:17 +0100
          Re: Parse CSS styles and swap background position value Cezary Tomczyk <cezary.tomczyk@gmail.com> - 2015-02-03 01:59 -0800
            Re: Parse CSS styles and swap background position value "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2015-02-03 11:39 +0100
            Re: Parse CSS styles and swap background position value Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2015-02-03 15:37 +0100
              Re: Parse CSS styles and swap background position value Cezary Tomczyk <cezary.tomczyk@gmail.com> - 2015-02-04 08:55 +0100
              Re: Parse CSS styles and swap background position value John Harris <niam@jghnorth.org.uk.invalid> - 2015-02-04 15:09 +0000
                Re: Parse CSS styles and swap background position value Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2015-02-04 16:19 +0100
          Re: Parse CSS styles and swap background position value Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2015-02-03 12:44 +0100

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