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# frozen_string_literal: true
require 'dry/types/decorator'
module Dry
module Types
# Default types are useful when a missing value should be replaced by a default one
#
# @api public
class Default
# @api private
class Callable < Default
include Dry::Equalizer(:type, inspect: false, immutable: true)
# Evaluates given callable
# @return [Object]
def evaluate
value.call(type)
end
end
include Type
include Decorator
include Builder
include Printable
include Dry::Equalizer(:type, :value, inspect: false, immutable: true)
# @return [Object]
attr_reader :value
alias_method :evaluate, :value
# @param [Object, #call] value
#
# @return [Class] {Default} or {Default::Callable}
#
# @api private
def self.[](value)
if value.respond_to?(:call)
Callable
else
self
end
end
# @param [Type] type
# @param [Object] value
#
# @api private
def initialize(type, value, **options)
super
@value = value
end
# Build a constrained type
#
# @param [Array] args see {Dry::Types::Builder#constrained}
#
# @return [Default]
#
# @api public
def constrained(*args)
type.constrained(*args).default(value)
end
# @return [true]
#
# @api public
def default?
true
end
# @param [Object] input
#
# @return [Result::Success]
#
# @api public
def try(input)
success(call(input))
end
# @return [Boolean]
#
# @api public
def valid?(value = Undefined)
Undefined.equal?(value) || super
end
# @param [Object] input
#
# @return [Object] value passed through {#type} or {#default} value
#
# @api private
def call_unsafe(input = Undefined)
if input.equal?(Undefined)
evaluate
else
Undefined.default(type.call_unsafe(input)) { evaluate }
end
end
# @param [Object] input
#
# @return [Object] value passed through {#type} or {#default} value
#
# @api private
def call_safe(input = Undefined, &block)
if input.equal?(Undefined)
evaluate
else
Undefined.default(type.call_safe(input, &block)) { evaluate }
end
end
end
end
end
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