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CSS::Minifier::XS(3)  User Contributed Perl Documentation CSS::Minifier::XS(3)

NAME
       CSS::Minifier::XS - XS based CSS minifier

SYNOPSIS
	 use CSS::Minifier::XS qw(minify);
	 $minified = minify($css);

DESCRIPTION
       "CSS::Minifier::XS" is a CSS "minifier"; its designed to remove un-
       necessary whitespace and comments from CSS files, while also not
       breaking the CSS.

       "CSS::Minifier::XS" is similar in function to "CSS::Minifier", but is
       substantially faster as its written in XS and not just pure Perl.

METHODS
       minify($css)
	   Minifies the given $css, returning the minified CSS back to the
	   caller.

HOW IT WORKS
       "CSS::Minifier::XS" minifies the CSS by removing un-necessary
       whitespace from CSS documents.  Comment blocks are also removed, except
       when (a) they contain the word "copyright" in them, or (b) they're
       needed to implement the "Mac/IE Comment Hack".

       Internally, the minification is done by taking multiple passes through
       the CSS document:

   Pass 1: Tokenize
       First, we go through and parse the CSS document into a series of tokens
       internally.  The tokenizing process does not check to make sure that
       you've got syntactically valid CSS, it just breaks up the text into a
       stream of tokens suitable for processing by the subsequent stages.

   Pass 2: Collapse
       We then march through the token list and collapse certain tokens down
       to their smallest possible representation.  If they're still included
       in the final results we only want to include them at their shortest.

       Whitespace
	   Runs of multiple whitespace characters are reduced down to a single
	   whitespace character.  If the whitespace contains any "end of line"
	   (EOL) characters, then the end result is the first EOL character
	   encountered.	 Otherwise, the result is the first whitespace
	   character in the run.

       Comments
	   Comments implementing the "Mac/IE Comment Hack" are collapsed down
	   to the smallest possible comment that would still implement the
	   hack ("/*\*/" to start the hack, and "/**/" to end it).

   Pass 3: Pruning
       We then go back through the token list and prune and remove un-
       necessary tokens.

       Whitespace
	   Wherever possible, whitespace is removed; before+after comment
	   blocks, and before+after various symbols/sigils.

       Comments
	   Comments that either (a) are needed to implement the "Mac/IE
	   Comment Hack", or that (b) contain the word "copyright" in them are
	   preserved.  All other comments are removed.

       Symbols/Sigils
	   Semi-colons that are immediately followed by a closing brace (e.g.
	   ";}") are removed; semi-colons are needed to separate multiple
	   declarations, but aren't required at the end of a group.

       Everything else
	   We keep everything else; identifiers, quoted literal strings,
	   symbols/sigils, etc.

   Pass 4: Re-assembly
       Lastly, we go back through the token list and re-assemble it all back
       into a single CSS string, which is then returned back to the caller.

AUTHOR
       Graham TerMarsch (cpan@howlingfrog.com)

REPORTING BUGS
       Please report bugs via RT
       (<http://rt.cpan.org/Dist/Display.html?Queue=CSS::Minifier::XS>), and
       be sure to include the CSS that you're having troubles minifying.

COPYRIGHT
       Copyright (C) 2007-2010, Graham TerMarsch.  All Rights Reserved.

       This is free software; you can redistribute it and/or modify it under
       the same license as Perl itself.

SEE ALSO
       "CSS::Minifier".

perl v5.14.1			  2010-07-22		  CSS::Minifier::XS(3)
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