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|
# frozen_string_literal: true
require 'dry/types/options'
require 'dry/types/meta'
module Dry
module Types
# Sum type
#
# @api public
class Sum
include Type
include Builder
include Options
include Meta
include Printable
include Dry::Equalizer(:left, :right, :options, :meta, inspect: false, immutable: true)
# @return [Type]
attr_reader :left
# @return [Type]
attr_reader :right
# @api private
class Constrained < Sum
# @return [Dry::Logic::Operations::Or]
def rule
left.rule | right.rule
end
# @return [true]
def constrained?
true
end
end
# @param [Type] left
# @param [Type] right
# @param [Hash] options
#
# @api private
def initialize(left, right, **options)
super
@left, @right = left, right
freeze
end
# @return [String]
#
# @api public
def name
[left, right].map(&:name).join(' | ')
end
# @return [false]
#
# @api public
def default?
false
end
# @return [false]
#
# @api public
def constrained?
false
end
# @return [Boolean]
#
# @api public
def optional?
primitive?(nil)
end
# @param [Object] input
#
# @return [Object]
#
# @api private
def call_unsafe(input)
left.call_safe(input) { right.call_unsafe(input) }
end
# @param [Object] input
#
# @return [Object]
#
# @api private
def call_safe(input, &block)
left.call_safe(input) { right.call_safe(input, &block) }
end
# @param [Object] input
#
# @api public
def try(input)
left.try(input) do
right.try(input) do |failure|
if block_given?
yield(failure)
else
failure
end
end
end
end
# @api private
def success(input)
if left.valid?(input)
left.success(input)
elsif right.valid?(input)
right.success(input)
else
raise ArgumentError, "Invalid success value '#{input}' for #{inspect}"
end
end
# @api private
def failure(input, _error = nil)
if !left.valid?(input)
left.failure(input, left.try(input).error)
else
right.failure(input, right.try(input).error)
end
end
# @param [Object] value
#
# @return [Boolean]
#
# @api private
def primitive?(value)
left.primitive?(value) || right.primitive?(value)
end
# Manage metadata to the type. If the type is an optional, #meta delegates
# to the right branch
#
# @see [Meta#meta]
#
# @api public
def meta(data = nil)
if data.nil?
optional? ? right.meta : super
elsif optional?
self.class.new(left, right.meta(data), **options)
else
super
end
end
# @see Nominal#to_ast
#
# @api public
def to_ast(meta: true)
[:sum, [left.to_ast(meta: meta), right.to_ast(meta: meta), meta ? self.meta : EMPTY_HASH]]
end
# @param [Hash] options
#
# @return [Constrained,Sum]
#
# @see Builder#constrained
#
# @api public
def constrained(options)
if optional?
right.constrained(options).optional
else
super
end
end
# Wrap the type with a proc
#
# @return [Proc]
#
# @api public
def to_proc
proc { |value| self.(value) }
end
end
end
end
|
