Opal is a ruby to javascript source-to-source compiler. It also has an implementation of the ruby corelib.

Opal is hosted on github, and there is a Freenode IRC channel at #opal. There is also a google group for opal.

See the website, http://opalrb.org.

Build the runtime, tests and dependencies:

rake opal

Run tests using phantom.js runner:

rake test

Alternatively, after building, you can open spec/index.html in any web browser.

The core directory holds the opal runtime and corelib implemented in ruby and javascript. These are built using rake opal, as above.

The lib directory holds the opal parser/compiler used to compile ruby into javascript. It is also built ready for the browser into opal-parser.js to allow compilation in any javascript environment.

• core contains rubyspecs that apply to opal.
• language applicable specs from rubyspec for testing language semantics
• opal tests for extra methods/features in opal not found in standard ruby
• lib specs for opal lib (parser, erb_parser, grammar etc)

Copyright (C) 2012 by Adam Beynon

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.