class Prism::DotVisitor

def visit_def_node(node)
  table = Table.new("DefNode")
  id = node_id(node)
  # name
  table.field("name", node.name.inspect)
  # name_loc
  table.field("name_loc", location_inspect(node.name_loc))
  # receiver
  unless (receiver = node.receiver).nil?
    table.field("receiver", port: true)
    digraph.edge("#{id}:receiver -> #{node_id(receiver)};")
  end
  # parameters
  unless (parameters = node.parameters).nil?
    table.field("parameters", port: true)
    digraph.edge("#{id}:parameters -> #{node_id(parameters)};")
  end
  # body
  unless (body = node.body).nil?
    table.field("body", port: true)
    digraph.edge("#{id}:body -> #{node_id(body)};")
  end
  # locals
  table.field("locals", node.locals.inspect)
  # def_keyword_loc
  table.field("def_keyword_loc", location_inspect(node.def_keyword_loc))
  # operator_loc
  unless (operator_loc = node.operator_loc).nil?
    table.field("operator_loc", location_inspect(operator_loc))
  end
  # lparen_loc
  unless (lparen_loc = node.lparen_loc).nil?
    table.field("lparen_loc", location_inspect(lparen_loc))
  end
  # rparen_loc
  unless (rparen_loc = node.rparen_loc).nil?
    table.field("rparen_loc", location_inspect(rparen_loc))
  end
  # equal_loc
  unless (equal_loc = node.equal_loc).nil?
    table.field("equal_loc", location_inspect(equal_loc))
  end
  # end_keyword_loc
  unless (end_keyword_loc = node.end_keyword_loc).nil?
    table.field("end_keyword_loc", location_inspect(end_keyword_loc))
  end
  digraph.nodes << <<~DOT
    #{id} [
      label=<#{table.to_dot.gsub(/\n/, "\n  ")}>
    ];
  DOT
  super
end