mirror of https://github.com/rails/execjs synced 2023-03-27 23:21:20 -04:00

Run JavaScript code from Ruby

Find a file

Joshua Peek 0008f70e8c No multi_json gem		2013-08-20 18:58:55 -05:00
lib	Replace multi_json with json	2013-05-11 21:21:08 -07:00
test	Add coffeescript smoke test	2012-05-20 12:35:12 -05:00
.gitignore	Add Gemfile	2011-06-07 16:05:18 -05:00
.travis.yml	Drop 1.9.2	2013-08-20 18:57:51 -05:00
execjs.gemspec	No multi_json gem	2013-08-20 18:58:55 -05:00
Gemfile	The source :rubygems is deprecated because HTTP requests are insecure	2013-05-11 21:16:51 -07:00
LICENSE	ExecJS 0.1.0	2011-03-10 17:38:33 -06:00
Rakefile	Add deprecated runtime flag	2012-05-20 14:25:13 -05:00
README.md	Deprecate Johnson	2012-05-20 14:30:36 -05:00

README.md

ExecJS

ExecJS lets you run JavaScript code from Ruby. It automatically picks the best runtime available to evaluate your JavaScript program, then returns the result to you as a Ruby object.

ExecJS supports these runtimes:

therubyracer - Google V8 embedded within Ruby
therubyrhino - Mozilla Rhino embedded within JRuby
Node.js
Apple JavaScriptCore - Included with Mac OS X
Microsoft Windows Script Host (JScript)

A short example:

require "execjs"
ExecJS.eval "'red yellow blue'.split(' ')"
# => ["red", "yellow", "blue"]

A longer example, demonstrating how to invoke the CoffeeScript compiler:

require "execjs"
require "open-uri"
source = open("http://jashkenas.github.com/coffee-script/extras/coffee-script.js").read

context = ExecJS.compile(source)
context.call("CoffeeScript.compile", "square = (x) -> x * x", :bare => true)
# => "var square;\nsquare = function(x) {\n  return x * x;\n};"

Installation

$ gem install execjs

License

Released under the MIT license. See LICENSE for details.