class Maybe

# File lib/possibly.rb, line 16
def ==(other)
  other.class == self.class
end

# File lib/possibly.rb, line 21
def inspect
  to_s
end

# File lib/possibly.rb, line 11
def to_ary
  __enumerable_value
end

# File lib/possibly.rb, line 55
def inst_method
  "#{print_method(@inst_method)}"
end

# File lib/possibly.rb, line 27
def print_error(msg)
  message =
    if msg
      msg + "\n\n"
    else
      "\n"
    end

  message + print_stack + "\n"
end

# File lib/possibly.rb, line 59
def print_method(invocation)
  method, args, block = invocation

  print_method =
    if method == :[]
      args.to_s
    else
      method.to_s
    end

  print_args =
    if method == :[]
      nil
    elsif args.empty?
      nil
    else
      "(#{args.join(', ')})"
    end

  [print_method, print_args].compact.join("")
end

# File lib/possibly.rb, line 38
def print_stack
  longest_method = stack.drop(1).map { |inv| inv.first }.map(&:length).max || 0
  stack.map { |(method, value)|
    method ||= ""
    "#{method.ljust(longest_method)} => #{value}"
  }.join("\n")
end

# File lib/possibly.rb, line 50
def self_stack
  [inst_method, self.inspect]
end

# File lib/possibly.rb, line 46
def stack
  @parent_stack + [self_stack]
end