= Ruby-YUI Compressor

Ruby-YUI Compressor provides a Ruby interface to the {YUI Compressor Java library}[http://developer.yahoo.com/yui/compressor/] for minifying JavaScript and CSS assets.

<b>Latest version:</b> 0.10.0 (includes YUI Compressor 2.4.7)

* {API documentation}[http://yui.rubyforge.org/]
* {Source code}[http://github.com/sstephenson/ruby-yui-compressor/]
* {Bug tracker}[http://github.com/sstephenson/ruby-yui-compressor/issues]

Tested on Mac OS X Ruby 1.8.7 and Ruby 1.9.2.

=== Installing and loading Ruby-YUI Compressor

Ruby-YUI Compressor is distributed as a Ruby Gem (<tt>yui-compressor</tt>). Because YUI Compressor's .jar file is included in the box, Java >= 1.4 is its only dependency.

  $ sudo gem install -r yui-compressor
  $ irb -rubygems
  >> require "yui/compressor"
  => true

You can also install Ruby-YUI Compressor with the {Rip package manager}[http://hellorip.com/]:

  $ rip install git://github.com/sstephenson/ruby-yui-compressor.git 0.10.0
  $ irb -rrip
  >> require "yui/compressor"
  => true

=== Using Ruby-YUI Compressor

Create either a YUI::CssCompressor or a YUI::JavaScriptCompressor. Then pass an IO or string to the YUI::Compressor#compress method and get the compressed contents back as a string or have them yielded to a block.

==== Example: Compress JavaScript
  compressor = YUI::JavaScriptCompressor.new
  compressor.compress('(function () { var foo = {}; foo["bar"] = "baz"; })()')
  # => "(function(){var foo={};foo.bar=\"baz\"})();"

==== Example: Compress JavaScript and shorten local variable names
  compressor = YUI::JavaScriptCompressor.new(:munge => true)
  compressor.compress('(function () { var foo = {}; foo["bar"] = "baz"; })()')
  # => "(function(){var a={};a.bar=\"baz\"})();"

==== Example: Compress CSS
  compressor = YUI::CssCompressor.new
  compressor.compress(<<-END_CSS)
    div.error {
      color: red;
    }
    div.warning {
      display: none;
    }
  END_CSS
  # => "div.error{color:red;}div.warning{display:none;}"

==== Overriding the path to Java or the YUI Compressor .jar file

By default, YUI::Compressor looks for Java as the +java+ command in your path, and uses the YUI Compressor .jar file in YUI::Compressor's vendor directory. You can override both with the :java and :jar_file options:

  YUI::JavaScriptCompressor.new(
    :java     => "/usr/bin/java",
    :jar_file => "/path/to/my/yuicompressor-2.4.7.jar"
  )

==== Additional compression options

See the YUI::CssCompressor and YUI::JavaScriptCompressor documentation for more information on format-specific compression options.


== Licenses

==== Ruby-YUI Compressor code and documentation (MIT license)

  Copyright (c) 2011 Sam Stephenson

  Permission is hereby granted, free of charge, to any person obtaining
  a copy of this software and associated documentation files (the
  "Software"), to deal in the Software without restriction, including
  without limitation the rights to use, copy, modify, merge, publish,
  distribute, sublicense, and/or sell copies of the Software, and to
  permit persons to whom the Software is furnished to do so, subject to
  the following conditions:

  The above copyright notice and this permission notice shall be
  included in all copies or substantial portions of the Software.

  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

==== YUI Compressor (BSD license)

  Copyright (c) 2009, Yahoo! Inc.
  All rights reserved.

  Redistribution and use of this software in source and binary forms,
  with or without modification, are permitted provided that the following
  conditions are met:

  * Redistributions of source code must retain the above
    copyright notice, this list of conditions and the
    following disclaimer.

  * Redistributions in binary form must reproduce the above
    copyright notice, this list of conditions and the
    following disclaimer in the documentation and/or other
    materials provided with the distribution.

  * Neither the name of Yahoo! Inc. nor the names of its
    contributors may be used to endorse or promote products
    derived from this software without specific prior
    written permission of Yahoo! Inc.

  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

  This software also requires access to software from the following sources:

  The Jarg Library v 1.0 ( http://jargs.sourceforge.net/ ) is available
  under a BSD License. Copyright (c) 2001-2003 Steve Purcell,
  Copyright (c) 2002 Vidar Holen, Copyright (c) 2002 Michal Ceresna and
  Copyright (c) 2005 Ewan Mellor.

  The Rhino Library ( http://www.mozilla.org/rhino/ ) is dually available
  under an MPL 1.1/GPL 2.0 license, with portions subject to a BSD license.

  Additionally, this software contains modified versions of the following
  component files from the Rhino Library:

  [org/mozilla/javascript/Decompiler.java]
  [org/mozilla/javascript/Parser.java]
  [org/mozilla/javascript/Token.java]
  [org/mozilla/javascript/TokenStream.java]

  The modified versions of these files are distributed under the MPL v 1.1
  ( http://www.mozilla.org/MPL/MPL-1.1.html )
