Expose common flags in inspect output

Author: kddnewton

templates/lib/prism/inspect_visitor.rb.erb

@@ -69,12 +69,12 @@ module Prism
     # Inspect a <%= node.name %> node.
     def visit_<%= node.human %>(node)
       commands << [inspect_node(<%= node.name.inspect %>, node), indent]
-      <%- (fields = [*node.flags, *node.fields]).each_with_index do |field, index| -%>
+      <%- (fields = [node.flags || Prism::Template::Flags.empty, *node.fields]).each_with_index do |field, index| -%>
       <%- pointer = index == fields.length - 1 ? "└── " : "├── " -%>
       <%- preadd = index == fields.length - 1 ? "    " : "│   " -%>
       <%- case field -%>
       <%- when Prism::Template::Flags -%>
-      flags = [<%= field.values.map { |value| "(\"#{value.name.downcase}\" if node.#{value.name.downcase}?)" }.join(", ") %>].compact
+      flags = [("newline" if node.newline?), ("static_literal" if node.static_literal?), <%= field.values.map { |value| "(\"#{value.name.downcase}\" if node.#{value.name.downcase}?)" }.join(", ") %>].compact
       commands << ["<%= pointer %>flags: #{flags.empty? ? "∅" : flags.join(", ")}\n", indent]
       <%- when Prism::Template::NodeListField -%>
       commands << ["<%= pointer %><%= field.name %>: (length: #{(<%= field.name %> = node.<%= field.name %>).length})\n", indent]

templates/template.rb

@@ -493,6 +493,10 @@ def initialize(config)
         @values = config.fetch("values").map { |flag| Flag.new(flag) }
         @comment = config.fetch("comment")
       end
+
+      def self.empty
+        new("name" => "", "values" => [], "comment" => "")
+      end
     end
 
     class << self