Class: Opal::CliRunners::Nodejs

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

Defined Under Namespace

Classes: MissingNodeJS

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(output) ⇒ Nodejs

Returns a new instance of Nodejs



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# File 'opal/lib/opal/cli_runners/nodejs.rb', line 6

def initialize(output)
  @output ||= output
end

Instance Attribute Details

#exit_status ⇒ Object (readonly)

Returns the value of attribute exit_status



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# File 'opal/lib/opal/cli_runners/nodejs.rb', line 9

def exit_status
  @exit_status
end

#output ⇒ Object (readonly)

Returns the value of attribute output



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# File 'opal/lib/opal/cli_runners/nodejs.rb', line 9

def output
  @output
end

Instance Method Details

#node_modules ⇒ Object 



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# File 'opal/lib/opal/cli_runners/nodejs.rb', line 15

def node_modules
  File.expand_path("../../../../node_modules", __FILE__)
end

#puts(*args) ⇒ Object 



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

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

#run(code, argv) ⇒ Object 



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# File 'opal/lib/opal/cli_runners/nodejs.rb', line 19

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 31

def system_with_output(env, *cmd)
  if (io_output = 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