superduper.rb

require "ast"

class Superduper
  class EnumerableAST
    include Enumerable

    def initialize ast
      @ast = ast
    end

    def each &block
      enumerate @ast, &block
    end

    private

    def enumerate node, &block
      yield node

      node.children.grep(RubyVM::AbstractSyntaxTree::Node).each do |node|
        enumerate node, &block
      end
    end
  end

  def self.parse_file file
    enum = EnumerableAST.new RubyVM::AbstractSyntaxTree.parse_file file

    enum.each { |node|
      if node.type == :DEFN || node.type == :DEFS
        method = node
        if method.children.last.type == :SCOPE &&
          method.children.last.children.last &&
          method.children.last.children.last.type == :ZSUPER
          puts "#{file}:#{method.first_lineno}"
        end
      end
    }
  end
end

if $0 == __FILE__
  Superduper.parse_file(ARGV[0] || __FILE__)
end