count_const_refs.rb

class Array
  def deconstruct
    self
  end
end

class Hash
  def deconstruct_keys(_)
    self
  end
end

class Struct
  alias deconstruct to_a

  def deconstruct_keys(keys)
    raise TypeError, "wrong argument type #{keys.class} (expected Array or nil)" if keys && !keys.is_a?(Array)

    return to_h unless keys

    keys.each_with_object({}) do |k, acc|
      # if k is Symbol and not a member of a Struct return {}
      return {} if (Symbol === k || String === k) && !members.include?(k.to_sym)
      # if k is Integer check that index is not ouf of bounds
      return {} if Integer === k && k > size - 1
      acc[k] = self[k]
    end
  end
end

def count_constant_refs(iseq)
  cached = false

  iseq.last.each_with_object([]) do |insn, counts|
    case; when ((__m__ = insn)) && false 
    when (__p_1__ = __m__.respond_to?(:deconstruct) && (((__m_arr__ = __m__.deconstruct) || true) && (Array === __m_arr__ || Kernel.raise(TypeError, "#deconstruct must return Array"))) and ((:opt_getinlinecache === __m_arr__[0]) && __m_arr__[1..-1]))

      cached = true
      counts << 0
    when (__p_1__ && ((:getconstant === __m_arr__[0]) && __m_arr__[1..-1]))
      counts[counts.length - 1] += 1 if cached
    when (__p_1__ && ((:opt_setinlinecache === __m_arr__[0]) && __m_arr__[1..-1]))
      cached = false
    when (__p_1__ && (((child,) = nil) || __m_arr__.find.with_index { |__el__, __i__| (((Array === __el__) && (("YARVInstructionSequence/SimpleDataFormat" === __el__[0]) && __m_arr__[1..-1])) && ((child = __m_arr__[__i__]) || true)) }))
      counts.concat(count_constant_refs(child))
    else
    end
  end
end

[].tap do |counts|
  Dir["**/*.rb"].each do |filepath|
    iseq = RubyVM::InstructionSequence.compile_file(filepath).to_a
    counts << count_constant_refs(iseq)
  rescue SyntaxError
  end

  n, d = counts.sum(&:length), counts.length
  puts "Average const refs per file: #{n}/#{d} = #{(n.to_f / d).round(2)}"

  n, d = counts.sum(&:sum), n
  puts "Average const ref depth: #{n}/#{d} = #{(n.to_f / d).round(2)}"
end