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Contents
require 'dry/monads/maybe'
require 'dry/types/decorator'
module Dry
module Types
class Maybe
include Type
include Dry::Equalizer(:type, :options)
include Decorator
include Builder
include Dry::Monads::Maybe::Mixin
# @param [Dry::Monads::Maybe, Object] input
# @return [Dry::Monads::Maybe]
def call(input = Undefined)
case input
when Dry::Monads::Maybe
input
when Undefined
None()
else
Maybe(type[input])
end
end
alias_method :[], :call
# @param [Object] input
# @return [Result::Success]
def try(input = Undefined)
res = if input.equal?(Undefined)
None()
else
Maybe(type[input])
end
Result::Success.new(res)
end
# @return [true]
def default?
true
end
# @param [Object] value
# @see Dry::Types::Builder#default
# @raise [ArgumentError] if nil provided as default value
def default(value)
if value.nil?
raise ArgumentError, "nil cannot be used as a default of a maybe type"
else
super
end
end
end
module Builder
# @return [Maybe]
def maybe
Maybe.new(Types['strict.nil'] | self)
end
end
# Register non-coercible maybe types
NON_NIL.each_key do |name|
register("maybe.strict.#{name}", self["strict.#{name}"].maybe)
end
# Register coercible maybe types
COERCIBLE.each_key do |name|
register("maybe.coercible.#{name}", self["coercible.#{name}"].maybe)
end
end
end
Version data entries
7 entries across 7 versions & 1 rubygems