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Ruby-YUI Compressor

Ruby-YUI Compressor provides a Ruby interface to the YUI Compressor Java library for minifying JavaScript and CSS assets.

Latest version: 0.9.2 (includes YUI Compressor 2.4.2)

Tested on Mac OS X Ruby 1.8.7 and Ruby 1.9.1.

Installing and loading Ruby-YUI Compressor

Ruby-YUI Compressor is distributed as a Ruby Gem (yui-compressor). 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:

$ rip install git://github.com/sstephenson/ruby-yui-compressor.git 0.9.2
$ 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-2.4.2.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) 2009 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 )
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