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# frozen_string_literal: true
require 'dry/types/fn_container'
require 'dry/types/constructor/function'
module Dry
module Types
# Constructor types apply a function to the input that is supposed to return
# a new value. Coercion is a common use case for constructor types.
#
# @api public
class Constructor < Nominal
include Dry::Equalizer(:type, :options, inspect: false, immutable: true)
# @return [#call]
attr_reader :fn
# @return [Type]
attr_reader :type
undef :constrained?, :meta, :optional?, :primitive, :default?, :name
# @param [Builder, Object] input
# @param [Hash] options
# @param [#call, nil] block
#
# @api public
def self.new(input, **options, &block)
type = input.is_a?(Builder) ? input : Nominal.new(input)
super(type, **options, fn: Function[options.fetch(:fn, block)])
end
# Instantiate a new constructor type instance
#
# @param [Type] type
# @param [Function] fn
# @param [Hash] options
#
# @api private
def initialize(type, fn: nil, **options)
@type = type
@fn = fn
super(type, **options, fn: fn)
end
# @return [Object]
#
# @api private
def call_safe(input)
coerced = fn.(input) { |output = input| return yield(output) }
type.call_safe(coerced) { |output = coerced| yield(output) }
end
# @return [Object]
#
# @api private
def call_unsafe(input)
type.call_unsafe(fn.(input))
end
# @param [Object] input
# @param [#call,nil] block
#
# @return [Logic::Result, Types::Result]
# @return [Object] if block given and try fails
#
# @api public
def try(input, &block)
value = fn.(input)
rescue CoercionError => e
failure = failure(input, e)
block_given? ? yield(failure) : failure
else
type.try(value, &block)
end
# Build a new constructor by appending a block to the coercion function
#
# @param [#call, nil] new_fn
# @param [Hash] options
# @param [#call, nil] block
#
# @return [Constructor]
#
# @api public
def constructor(new_fn = nil, **options, &block)
with(**options, fn: fn >> (new_fn || block))
end
alias_method :append, :constructor
alias_method :>>, :constructor
# @return [Class]
#
# @api private
def constrained_type
Constrained::Coercible
end
# @see Nominal#to_ast
#
# @api public
def to_ast(meta: true)
[:constructor, [type.to_ast(meta: meta), fn.to_ast]]
end
# Build a new constructor by prepending a block to the coercion function
#
# @param [#call, nil] new_fn
# @param [Hash] options
# @param [#call, nil] block
#
# @return [Constructor]
#
# @api public
def prepend(new_fn = nil, **options, &block)
with(**options, fn: fn << (new_fn || block))
end
alias_method :<<, :prepend
# Build a lax type
#
# @return [Lax]
# @api public
def lax
Lax.new(Constructor.new(type.lax, **options))
end
# Wrap the type with a proc
#
# @return [Proc]
#
# @api public
def to_proc
proc { |value| self.(value) }
end
private
# @param [Symbol] meth
# @param [Boolean] include_private
# @return [Boolean]
#
# @api private
def respond_to_missing?(meth, include_private = false)
super || type.respond_to?(meth)
end
# Delegates missing methods to {#type}
#
# @param [Symbol] method
# @param [Array] args
# @param [#call, nil] block
#
# @api private
def method_missing(method, *args, &block)
if type.respond_to?(method)
response = type.public_send(method, *args, &block)
if response.is_a?(Type) && type.class == response.class
response.constructor_type.new(response, **options)
else
response
end
else
super
end
end
end
end
end
|
