Class: Opal::Optimizer::Step::CollapseStubs

Inherits:
Opal::Optimizer::Step show all
Defined in:
lib/opal/optimizer/step/collapse_stubs.rb

Instance Method Summary collapse

Methods inherited from Opal::Optimizer::Step

#initialize

Methods included from Helpers

#parse_js

Constructor Details

This class inherits a constructor from Opal::Optimizer::Step

Instance Method Details

#run ⇒ Object 



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# File 'lib/opal/optimizer/step/collapse_stubs.rb', line 6

def run
  # We can't collapse when no corelib present.
  return unless corelib

  stubs = Set.new

  nodes = corelib_calls["add_stubs"] || []
  nodes.each do |node|
    if opal_version >= 1.4
      stubs += node.arguments.value.first.value[1..-2].split(',').map(&"$".method(:+))
    else
      stubs += node.arguments.value.first.value.map do |i|
        i.value.value.gsub(/['"]/, '')
      end
    end

    node.destroy! "CollapseStubs"
  end

  stubs -= ["__send__", "class", "!=", "equal?", "==", "__id__", "!",
            "initialize", "eql?", "instance_eval", "instance_exec",
            "singleton_method_added", "singleton_method_removed",
            "singleton_method_undefined", "method_missing"].map(&"$".method(:+))

  stubs -= ["$respond_to_missing?"] if opal_version >= 1.1


  new_stub_code = <<~JAVASCRIPT
    var stubs = '#{stubs.to_a.join(',')}'.split(','), stubs_obj = {};
    for (var i = 0; i < stubs.length; i++)
      stubs_obj[stubs[i]] = {value: Opal.stub_for(stubs[i]), enumerable: false, configurable: true, writable: true};
    Object.defineProperties(Opal.BasicObject.$$prototype, stubs_obj);
  JAVASCRIPT

  new_stub_code = parse_js(new_stub_code)

  corelib_source.value += new_stub_code.value
end