class Plumb::Key

def self.wrap(key)
  key.is_a?(Key) ? key : new(key)
end

def eql?(other)
  other.hash == hash
end

def hash
  @key.hash
end

def initialize(key, optional: false)
  key_s = key.to_s
  match = OPTIONAL_EXP.match(key_s)
  @node_name = :key
  @key = match[1]
  @to_sym = @key.to_sym
  @optional = !match[2].nil? ? true : optional
  freeze
end

def inspect
  "#{@key}#{'?' if @optional}"
end

def optional?
  @optional
end

def to_s = @key