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Opal

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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.

Usage

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

Compiling ruby code

Opal.compile is a simple interface to just compile a string of ruby into a string of javascript code.

Opal.compile("puts 'wow'")  # => "(function() { ... })()"

Running this by itself is not enough, you need the opal runtime/corelib.

Building the corelib

Opal::Builder can be used to build the runtime/corelib into a string.

Opal::Builder.build('opal') #=> "(function() { ... })()"

Running compiled code

You can write the above two strings to file, and run as:

<!DOCTYPE html>
<html>
  <head>
    <script src="opal.js"></script>
    <script src="app.js"></script>
  </head>
</html>

Just open a browser to this page and view the console.

Running tests

First, install dependencies:

$ bundle install

Rubyspecs must be cloned as a gitsubmodule:

$ git submodule update --init

Tests can be run with phantomjs using:

$ rake

Alternatively, you can just load up a rack instance using rackup spec/config.ru, and visit http://localhost:9292/ in any web browser.

Code Overview

What code is supposed to run where?

  • lib/ code runs inside your ruby env. It compiles ruby to javascript.
  • opal/ is the runtime/corelib for our implementation (runs in browser)
  • stdlib/ is our implementation of ruby stdlib. It is optional (for browser).

lib

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.

corelib

This directory holds the opal runtime and corelib implemented in ruby and javascript.

stdlib

Holds the stdlib that opal currently supports. This includes Observable, StringScanner, Date, etc.

spec

  • opal opal additions/special behaviour in the runtime/corelib
  • cli specs for opal lib (parser, lexer, grammar, compiler etc)

License

(The MIT License)

Copyright (C) 2013 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.

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