block5.ruby

irb> require 'parser/current'
irb> require 'rexml/document'
irb> snippet = 'f.text_field :attr, placeholder: "placeholder text"'
irb> exp = Parser::CurrentRuby.parse(snippet)
irb> xml = XMLAST.new(exp)
irb> xml.doc.write(STDOUT, 2)
<root>
  <send>
    <send>
      <nilclass-val />
      <symbol-val />
    </send>
    <symbol-val />
    <sym>
      <symbol-val />
    </sym>
    <hash>
      <pair>
        <sym>
          <symbol-val />
        </sym>
        <str>
          <string-val />
        </str>
      </pair>
    </hash>
  </send>
</root>