class Prism::DotVisitor

def visit_unless_node(node)

Visit a UnlessNode node. 
def visit_unless_node(node)
  table = Table.new("UnlessNode")
  id = node_id(node)
  # keyword_loc
  table.field("keyword_loc", location_inspect(node.keyword_loc))
  # predicate
  table.field("predicate", port: true)
  digraph.edge("#{id}:predicate -> #{node_id(node.predicate)};")
  # then_keyword_loc
  unless (then_keyword_loc = node.then_keyword_loc).nil?
    table.field("then_keyword_loc", location_inspect(then_keyword_loc))
  end
  # statements
  unless (statements = node.statements).nil?
    table.field("statements", port: true)
    digraph.edge("#{id}:statements -> #{node_id(statements)};")
  end
  # consequent
  unless (consequent = node.consequent).nil?
    table.field("consequent", port: true)
    digraph.edge("#{id}:consequent -> #{node_id(consequent)};")
  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