Module: ExecJS::Runtimes

Defined in:
lib/execjs/runtimes.rb

Constant Summary collapse

RubyRacer = 
RubyRacerRuntime.new
RubyRhino = 
RubyRhinoRuntime.new
Johnson = 
JohnsonRuntime.new
Mustang = 
MustangRuntime.new
Node = 
ExternalRuntime.new(
  :name        => "Node.js (V8)",
  :command     => ["nodejs", "node"],
  :runner_path => ExecJS.root + "/support/node_runner.js",
  :encoding    => 'UTF-8'
)
JavaScriptCore = 
ExternalRuntime.new(
  :name        => "JavaScriptCore",
  :command     => "/System/Library/Frameworks/JavaScriptCore.framework/Versions/A/Resources/jsc",
  :runner_path => ExecJS.root + "/support/jsc_runner.js"
)
SpiderMonkey = 
Spidermonkey = ExternalRuntime.new(
  :name        => "SpiderMonkey",
  :command     => "js",
  :runner_path => ExecJS.root + "/support/spidermonkey_runner.js"
)
JScript = 
ExternalRuntime.new(
  :name        => "JScript",
  :command     => "cscript //E:jscript //Nologo //U",
  :runner_path => ExecJS.root + "/support/jscript_runner.js",
  :encoding    => 'UTF-16LE' # CScript with //U returns UTF-16LE
)

Class Method Summary collapse

Class Method Details

.autodetect ⇒ Object 



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# File 'lib/execjs/runtimes.rb', line 45

def self.autodetect
  from_environment || best_available ||
    raise(RuntimeUnavailable, "Could not find a JavaScript runtime. " +
      "See https://github.com/sstephenson/execjs for a list of available runtimes.")
end

.best_available ⇒ Object 



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# File 'lib/execjs/runtimes.rb', line 51

def self.best_available
  runtimes.find(&:available?)
end

.from_environment ⇒ Object 



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# File 'lib/execjs/runtimes.rb', line 55

def self.from_environment
  if name = ENV["EXECJS_RUNTIME"]
    if runtime = const_get(name)
      if runtime.available?
        runtime if runtime.available?
      else
        raise RuntimeUnavailable, "#{runtime.name} runtime is not available on this system"
      end
    elsif !name.empty?
      raise RuntimeUnavailable, "#{name} runtime is not defined"
    end
  end
end

.names ⇒ Object 



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# File 'lib/execjs/runtimes.rb', line 69

def self.names
  @names ||= constants.inject({}) { |h, name| h.merge(const_get(name) => name) }.values
end

.runtimes ⇒ Object 



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# File 'lib/execjs/runtimes.rb', line 73

def self.runtimes
  @runtimes ||= [
    RubyRacer,
    RubyRhino,
    Johnson,
    Mustang,
    Node,
    JavaScriptCore,
    SpiderMonkey,
    JScript
  ]
end