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# frozen_string_literal: true
require 'dry/types/decorator'
module Dry
module Types
# Enum types can be used to define an enum on top of an existing type
#
# @api public
class Enum
include Type
include Dry::Equalizer(:type, :mapping, inspect: false, immutable: true)
include Decorator
include Builder
# @return [Array]
attr_reader :values
# @return [Hash]
attr_reader :mapping
# @return [Hash]
attr_reader :inverted_mapping
# @param [Type] type
# @param [Hash] options
# @option options [Array] :values
#
# @api private
def initialize(type, **options)
super
@mapping = options.fetch(:mapping).freeze
@values = @mapping.keys.freeze
@inverted_mapping = @mapping.invert.freeze
freeze
end
# @return [Object]
#
# @api private
def call_unsafe(input)
type.call_unsafe(map_value(input))
end
# @return [Object]
#
# @api private
def call_safe(input, &block)
type.call_safe(map_value(input), &block)
end
# @see Dry::Types::Constrained#try
#
# @api public
def try(input)
super(map_value(input))
end
# @api private
def default(*)
raise '.enum(*values).default(value) is not supported. Call '\
'.default(value).enum(*values) instead'
end
# Check whether a value is in the enum
alias_method :include?, :valid?
# @see Nominal#to_ast
#
# @api public
def to_ast(meta: true)
[:enum, [type.to_ast(meta: meta), mapping]]
end
# @return [String]
#
# @api public
def to_s
PRINTER.(self)
end
alias_method :inspect, :to_s
private
# Maps a value
#
# @param [Object] input
#
# @return [Object]
#
# @api private
def map_value(input)
if input.equal?(Undefined)
type.call
elsif mapping.key?(input)
input
else
inverted_mapping.fetch(input, input)
end
end
end
end
end
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