class Sass::Value::List

def ==(other)
  (other.is_a?(Sass::Value::List) &&
   other.contents == contents &&
   other.separator == separator &&
   other.bracketed? == bracketed?) ||
    (to_a.empty? && other.is_a?(Sass::Value::Map) && other.to_a.empty?)
end

def assert_map(name = nil)
  to_a.empty? ? Sass::Value::Map.new({}) : super.assert_map(name)
end

def at(index)
  index = index.floor
  index = to_a.length + index if index.negative?
  return nil if index.negative? || index >= to_a.length
  to_a[index]
end

def bracketed?
  @bracketed
end

def hash
  @hash ||= contents.hash
end

def initialize(contents = [], separator: ',', bracketed: false)
  if separator.nil? && contents.length > 1
    raise Sass::ScriptError, 'A list with more than one element must have an explicit separator'
  end
  @contents = contents.freeze
  @separator = separator.freeze
  @bracketed = bracketed.freeze
end

def to_a_length
  to_a.length
end

def to_map
  to_a.empty? ? Sass::Value::Map.new({}) : nil
end