class Opal::Nodes::IfNode

def compile
  truthy, falsy = self.truthy, self.falsy
  if skip_check_present?
    falsy = nil
  end
  push "if (", js_truthy(test), ") {"
  # skip if-body if no truthy sexp
  indent { line stmt(truthy) } if truthy
  if falsy
    if falsy.type == :if
      line "} else ", stmt(falsy)
    else
      indent do
        line "} else {"
        line stmt(falsy)
      end
      line "}"
    end
  else
    push "}"
  end
  wrap "(function() {", "; return nil; })()" if needs_wrapper?
end

def falsy
  needs_wrapper? ? compiler.returns(false_body || s(:nil)) : false_body
end

def needs_wrapper?
  expr? or recv?
end

def skip_check_present?
  test == RUBY_ENGINE_CHECK or test == RUBY_PLATFORM_CHECK
end

def truthy
  needs_wrapper? ? compiler.returns(true_body || s(:nil)) : true_body
end