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# frozen_string_literal: true
require 'set'
require 'forwardable'
# MIME::Types requires a serializable keyed container that returns an empty Set
# on a key miss. Hash#default_value cannot be used because, while it traverses
# the Marshal format correctly, it won't survive any other serialization
# format (plus, a default of a mutable object resuls in a shared mess).
# Hash#default_proc cannot be used without a wrapper because it prevents
# Marshal serialization (and doesn't survive the round-trip).
class MIME::Types::Container
extend Forwardable
def initialize
@container = {}
end
def [](key)
container[key] || EMPTY_SET
end
def_delegators :@container,
:count,
:each_value,
:keys,
:merge,
:merge!,
:select,
:values
def add(key, value)
(container[key] ||= Set.new).add(value)
end
def marshal_dump
{}.merge(container)
end
def marshal_load(hash)
@container = hash
end
def encode_with(coder)
container.each { |k, v| coder[k] = v.to_a }
end
def init_with(coder)
coder.map.each { |k, v| container[k] = Set[*v] }
end
private
attr_reader :container
EMPTY_SET = Set.new.freeze
private_constant :EMPTY_SET
end
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