class Prism::DotVisitor

def visit_when_node(node)

Visit a WhenNode node. 
def visit_when_node(node)
  table = Table.new("WhenNode")
  id = node_id(node)
  # keyword_loc
  table.field("keyword_loc", location_inspect(node.keyword_loc))
  # conditions
  if node.conditions.any?
    table.field("conditions", port: true)
    waypoint = "#{id}_conditions"
    digraph.waypoint("#{waypoint};")
    digraph.edge("#{id}:conditions -> #{waypoint};")
    node.conditions.each { |child| digraph.edge("#{waypoint} -> #{node_id(child)};") }
  else
    table.field("conditions", "[]")
  end
  # statements
  unless (statements = node.statements).nil?
    table.field("statements", port: true)
    digraph.edge("#{id}:statements -> #{node_id(statements)};")
  end
  digraph.nodes << <<~DOT
    #{id} [
      label=<#{table.to_dot.gsub(/\n/, "\n  ")}>
    ];
  DOT
  super
end