class Unparser::Writer::Regexp::Effective

def dispatch
  buffer.root_indent do
    write(token_open)
    body.each(&method(:emit_body))
    write(token_close)
    emit_options
  end
end

def emit_body(node)
  if n_begin?(node)
    write('#{')
    node.children.each(&method(:visit))
    write('}')
  elsif n_gvar?(node)
    write('#')
    write_regular(node.children.first.to_s)
  else
    write_regular(node.children.first)
  end
end

def emit_options
  write(children.last.children.join)
end

def write_regular(string)
  if string.length > 1 && string.start_with?("\n")
    string.each_char do |char|
      buffer.append_without_prefix(char.eql?("\n") ? '\c*' : char)
    end
  else
    buffer.append_without_prefix(string)
  end
end