class Crimp

# File lib/crimp.rb, line 17
def annotate(obj)
  obj = coerce(obj)

  case obj
  when String
    [obj, 'S']
  when Numeric
    [obj, 'N']
  when TrueClass, FalseClass
    [obj, 'B']
  when NilClass
    [nil, '_']
  when Array
    [sort(obj), 'A']
  when Hash
    [sort(obj), 'H']
  else
    raise TypeError, "Expected a (String|Number|Boolean|Nil|Hash|Array), Got #{obj.class}."
  end
end

# File lib/crimp.rb, line 13
def notation(obj)
  annotate(obj).flatten.join
end

# File lib/crimp.rb, line 9
def signature(obj)
  Digest::MD5.hexdigest(notation(obj))
end

# File lib/crimp.rb, line 44
def coerce(obj)
  case obj
  when Symbol then obj.to_s
  when Set    then obj.to_a
  else obj
  end
end

# File lib/crimp.rb, line 40
def sort(coll)
  coll.deep_sort_by { |obj| obj.to_s }.map { |obj| annotate(obj) }
end