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

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 v5.14.2							    2011-11-15						    CSS::Minifier::XS(3pm)