https://github.com/mikamai/meteor-opal

Meteor support for Opal, the Ruby to Javascript Compiler
https://github.com/mikamai/meteor-opal

Last synced: 24 days ago
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Meteor support for Opal, the Ruby to Javascript Compiler

• Host: GitHub
• URL: https://github.com/mikamai/meteor-opal
• Owner: mikamai
• License: mit
• Created: 2015-02-12T13:10:54.000Z (almost 10 years ago)
• Default Branch: master
• Last Pushed: 2015-05-15T15:34:11.000Z (over 9 years ago)
• Last Synced: 2024-11-01T00:32:26.699Z (2 months ago)
• Language: JavaScript
• Homepage: http://opalrb.org
• Size: 372 KB
• Stars: 15
• Watchers: 27
• Forks: 1
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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• awesome-opal - Meteor Opal - Meteor support for Opal, the Ruby to Javascript Compiler (Uncategorized / Uncategorized)

README

        
# meteor-opal

Meteor support for Opal, the Ruby to Javascript Compiler

# DISCLAIMER

**this is alpha quality code**, it's not tested and not ready for production.

## What's Opal?

[Opal](http://opalrb.org) is a ruby to javascript compiler, an implementation of the ruby corelib and stdlib, and associated gems.   

## Installation

```

meteor add mikamai:opal

```

Opal is supported on both the client and the server.  

Files ending with `.rb` or `.js.rb` are automatically compiled to JavaScript.

## Javascript interoperability

See the [compiled ruby section](http://opalrb.org/docs/compiled_ruby/) on Opal website.   

Opal uses it's own global namespace, therefore classes and functions created using Opal, are immediatley available across every other module and/or package in the application, provided you use Opal or the Javascript equivalent `Opal.`.   

For example the class `User` defined above will be accessible as `User` in Opal and as `Opal.User` in Javascript.  

All functions are compiled with a `$` sign in front of the name, so method `new` of class `User` becomes `Opal.User.$new` and function `b` `Opal.Object.$b` (functions resides in the Object namespace).   

## Namespacing and Opal

All Opal classes/functions will be globally available to all other modules through the Opal's own private namespace.

## Usage

```ruby

class User

  attr_accessor :name

  def initialize(name)

    @name = name

  end

  def admin?

    @name == 'Admin'

  end

end

def a

    123

end

$b = 321 # global variable

user = User.new('Bob')

puts user # #

puts user.admin? # false

puts "Hello from #{user.name}!" # Hello from Bob!

puts a # 123

puts $b # 321

```

```javascript

// somewhere else in Javascript

var user = Opal.User.$new('Bob');

console.log(user); //  { _id: ??, name: 'Bob' }

console.log(user['$admin?']()); // false 

                                // functions names cannot end in ? 

                                // so we access them as properties

console.log('Hello from ' + user.$name() + '!'); // Hello from Bob!

// function call

console.log(Opal.Object.$a()); // 123

// global variable

console.log(Opal.gvars.b); // 321

```