SemanSemantic-UItic-UI/node/node_modules/grunt-css/node_modules/clean-css

What is clean-css?

Clean-css is a node.js library for minifying CSS files. It does the same job as YUI Compressor's CSS minifier but much faster thanks to many speed optimizations and the node.js' V8 engine.

Usage

What are the requirements?

node 0.6.0+ on *nix (fully tested on OS X 10.6+ and CentOS)
node 0.8.0+ on Windows

How to install clean-css?

npm install clean-css

How to use clean-css?

To minify a public.css file into public-min.css do:

cleancss -o public-min.css public.css

To minify the same public.css into the standard output skip the -o parameter:

cleancss public.css

More likely you would like to concatenate couple files like this (if you are on *nix system):

cat one.css two.css three.css | cleancss -o merged-and-minified.css

or on Windows:

type one.css two.css three.css | cleancss -o merged-and-minified.css

Or even gzip the result at once:

cat one.css two.css three.css | cleancss | gzip -9 -c > merged-minified-and-gzipped.css.gz

How to use clean-css programmatically?

    var cleanCSS = require('clean-css');
    var source = "a{font-weight:bold;}";
    var minimized = cleanCSS.process(source);

Process method accepts a hash as a second parameter (i.e. cleanCSS.process(source, options)), with the following options available:

• keepSpecialComments - * for keeping all (default), 1 for keeping first one, 0 for removing all
• keepBreaks - whether to keep line breaks (default is false)
• removeEmpty - whether to remove empty elements (default is false)
• debug - turns on debug mode (measuring time spent on cleaning up - run make bench to see example)

How do you preserve a comment block?

Use /*! notation instead of standard one (i.e. /*):

/*!
  Important comments included in minified output.
*/

How to run clean-css tests?

First clone the source, then run:

npm test

on *nix systems. If you are under Windows then run:

test.bat

Acknowledgments

• Vincent Voyer (@vvo) for a patch with better empty element regex and for inspiring us to do many performance improvements in 0.4 release.
• Isaac (@facelessuser) for pointing out a flaw in clean-css' stateless mode.
• Jan Michael Alonzo (@jmalonzo) for a patch removing node's old 'sys' package.
• @XhmikosR for suggesting new features (option to remove special comments and strip out urls quotation) and pointing out numerous improvements (JSHint, media queries).

License

Clean-css is released under the MIT License.