Class: Requirejs::Runtime

Inherits:
Object
  • Object
show all
Defined in:
lib/requirejs/runtime/runtime.rb

Overview

Internal: Module responsible for the ExecJS interaction. Besides handling the compilation execution, this module provide a runtime validation to ensure that the Node.JS binary is available to use.

Instance Method Summary collapse

Constructor Details

#initialize(build_script) ⇒ Runtime

Internal: Module responsible for the ExecJS interaction. Besides handling the compilation execution, this module provide a runtime validation to ensure that the Node.JS binary is available to use.



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# File 'lib/requirejs/runtime/runtime.rb', line 12

def initialize(build_script)
  @build_script = build_script
end

Instance Method Details

#check_availability! ⇒ Object

private Internal: Queries the runtime for it’s availability and raises a ‘RuntimeError’ if the runtime isn’t available. Otherwise, this is a noop.



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# File 'lib/requirejs/runtime/runtime.rb', line 30

def check_availability!
  unless runtime.available?
    message = 'The Node.JS runtime is not available to RequireJS.'
    message << 'Ensure that the "node" (or "nodejs") executable is present in your $PATH.'
    raise RuntimeError, message
  end
end

#context ⇒ Object

Internal: Compile the Stylus compilation script into a execution context to execute functions into.

Returns the compiled context.



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# File 'lib/requirejs/runtime/runtime.rb', line 42

def context
  @context ||= runtime.compile(@build_script)
end

#exec(*arguments) ⇒ Object

Internal: Calls a specific function on the Node.JS context.

Example

exec('version', 2) # => '2'

Returns The function returned value.



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# File 'lib/requirejs/runtime/runtime.rb', line 22

def exec(*arguments)
  check_availability!
  context.call('optimize')
end

#runtime ⇒ Object

Internal: Create the ExecJS external runtime with a old runner script that maintains the state of ‘require’, so we can use it to load modules like on any Node.JS program.



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# File 'lib/requirejs/runtime/runtime.rb', line 49

def runtime
  #@runtime ||= ExecJS::Runtimes::Node
  @runtime ||= ExecJS::ExternalRuntime.new(
      :name => 'Node.js (V8)',
      :command => %w{nodejs node},
      :runner_path => File.expand_path('../node_runner.js', __FILE__),
      :encoding => 'UTF-8'
  )
end