Class: Tapioca::TypeVariableModule

Inherits:
Module
  • Object
show all
Extended by:
T::Sig
Defined in:
lib/tapioca/sorbet_ext/generic_name_patch.rb

Overview

This is subclassing from ‘Module` so that instances of this type will be modules. The reason why we want that is because that means those instances will automatically get bound to the constant names they are assigned to by Ruby. As a result, we don’t need to do any matching of constants to type variables to bind their names, Ruby will do that automatically for us and we get the ‘name` method for free from `Module`.

Defined Under Namespace

Classes: Type

Instance Method Summary collapse

Methods inherited from Module

#autoload, #autoload_without_tapioca

Constructor Details

#initialize(context, type, variance, fixed, lower, upper) ⇒ TypeVariableModule

rubocop:disable Metrics/ParameterLists



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# File 'lib/tapioca/sorbet_ext/generic_name_patch.rb', line 125

def initialize(context, type, variance, fixed, lower, upper) # rubocop:disable Metrics/ParameterLists
  @context = context
  @type = type
  @variance = variance
  @fixed = fixed
  @lower = lower
  @upper = upper
  super()
end

Instance Method Details

#coerce_to_type_variable ⇒ Object 



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# File 'lib/tapioca/sorbet_ext/generic_name_patch.rb', line 170

def coerce_to_type_variable
  TypeVariable.new(name, @variance)
end

#name ⇒ Object 



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# File 'lib/tapioca/sorbet_ext/generic_name_patch.rb', line 136

def name
  constant_name = super

  # This is a hack to work around modules under anonymous modules not having
  # names in 2.6 and 2.7: https://bugs.ruby-lang.org/issues/14895
  #
  # This happens when a type variable is declared under `class << self`, for
  # example.
  #
  # The workaround is to give the parent context a name, at which point, our
  # module gets bound to a name under that name, as well.
  unless constant_name
    constant_name = with_bound_name_pre_3_0 { super }
  end

  constant_name&.split("::")&.last
end

#serialize ⇒ Object 



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# File 'lib/tapioca/sorbet_ext/generic_name_patch.rb', line 155

def serialize
  parts = []
  parts << ":#{@variance}" unless @variance == :invariant
  parts << "fixed: #{@fixed}" if @fixed
  parts << "lower: #{@lower}" unless @lower == T.untyped
  parts << "upper: #{@upper}" unless @upper == BasicObject

  parameters = parts.join(", ")

  serialized = @type.serialize.dup
  serialized << "(#{parameters})" unless parameters.empty?
  serialized
end