class Sass::Value::Map

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

def assert_map(_name = nil)
  self
end

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

def hash
  @hash ||= contents.hash
end

def initialize(contents = {})
  @contents = contents.freeze
end

def separator
  contents.empty? ? nil : ','
end

def to_a
  contents.to_a.map { |entry| Sass::Value::List.new(entry, separator: ' ') }
end

def to_a_length
  contents.length
end

def to_map
  self
end