Class: Opal::CliRunners::Nodejs

Inherits:
Object
  • Object
show all
Defined in:
opal/lib/opal/cli_runners/nodejs.rb

Defined Under Namespace

Classes: MissingNodeJS

Constant Summary collapse

NODE_PATH =
File.expand_path('../stdlib/nodejs/node_modules', ::Opal.gem_dir)

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(options) ⇒ Nodejs

Returns a new instance of Nodejs.


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# File 'opal/lib/opal/cli_runners/nodejs.rb', line 11

def initialize(options)
  @output = options.fetch(:output, $stdout)
end

Instance Attribute Details

#exit_statusObject (readonly)

Returns the value of attribute exit_status.


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# File 'opal/lib/opal/cli_runners/nodejs.rb', line 14

def exit_status
  @exit_status
end

#outputObject (readonly)

Returns the value of attribute output.


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# File 'opal/lib/opal/cli_runners/nodejs.rb', line 14

def output
  @output
end

Instance Method Details

#node_modulesObject


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# File 'opal/lib/opal/cli_runners/nodejs.rb', line 20

def node_modules
  paths = ENV['NODE_PATH'].to_s.split(':')
  paths << NODE_PATH unless paths.include? NODE_PATH
  paths.join(':')
end

#puts(*args) ⇒ Object


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# File 'opal/lib/opal/cli_runners/nodejs.rb', line 16

def puts(*args)
  output.puts(*args)
end

#run(code, argv) ⇒ Object


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# File 'opal/lib/opal/cli_runners/nodejs.rb', line 26

def run(code, argv)
  require 'tempfile'
  tempfile = Tempfile.new('opal-nodejs-runner-')
  # tempfile = File.new('opal-nodejs-runner.js', 'w') # for debugging
  tempfile.write code
  tempfile.close
  system_with_output({ 'NODE_PATH' => node_modules }, 'node', tempfile.path, *argv)
rescue Errno::ENOENT
  raise MissingNodeJS, 'Please install Node.js to be able to run Opal scripts.'
end

#system_with_output(env, *cmd) ⇒ Object

Let's support fake IO objects like StringIO


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# File 'opal/lib/opal/cli_runners/nodejs.rb', line 38

def system_with_output(env, *cmd)
  if IO.try_convert(output)
    system(env, *cmd)
    @exit_status = $?.exitstatus
    return
  end

  if RUBY_PLATFORM == 'java'
    # JRuby has issues in dealing with subprocesses (at least up to 1.7.15)
    # @headius told me it's mostly fixed on master, but while we wait for it
    # to ship here's a tempfile workaround.
    require 'tempfile'
    require 'shellwords'
    tempfile = Tempfile.new('opal-node-output')
    system(env, cmd.shelljoin + " > #{tempfile.path}")
    @exit_status = $?.exitstatus
    captured_output = File.read tempfile.path
    tempfile.close
  else
    require 'open3'
    captured_output, status = Open3.capture2(env, *cmd)
    @exit_status = status.exitstatus
  end

  output.write captured_output
end