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Contents
# frozen_string_literal: true
# typed: true
module T::Private::Abstract::Declare
Abstract = T::Private::Abstract
AbstractUtils = T::AbstractUtils
def self.declare_abstract(mod, type:)
if AbstractUtils.abstract_module?(mod)
raise "#{mod} is already declared as abstract"
end
if T::Private::Final.final_module?(mod)
raise "#{mod} was already declared as final and cannot be declared as abstract"
end
Abstract::Data.set(mod, :can_have_abstract_methods, true)
Abstract::Data.set(mod.singleton_class, :can_have_abstract_methods, true)
Abstract::Data.set(mod, :abstract_type, type)
mod.extend(Abstract::Hooks)
if mod.is_a?(Class)
if type == :interface
# Since `interface!` is just `abstract!` with some extra validation, we could technically
# allow this, but it's unclear there are good use cases, and it might be confusing.
raise "Classes can't be interfaces. Use `abstract!` instead of `interface!`."
end
if Object.instance_method(:method).bind_call(mod, :new).owner == mod
raise "You must call `abstract!` *before* defining a `new` method"
end
# Don't need to silence warnings via without_ruby_warnings when calling
# define_method because of the guard above
mod.send(:define_singleton_method, :new) do |*args, &blk|
result = super(*args, &blk)
if result.instance_of?(mod)
raise "#{mod} is declared as abstract; it cannot be instantiated"
end
result
end
# Ruby doesn not emit "method redefined" warnings for aliased methods
# (more robust than undef_method that would create a small window in which the method doesn't exist)
mod.singleton_class.send(:alias_method, :new, :new)
if mod.singleton_class.respond_to?(:ruby2_keywords, true)
mod.singleton_class.send(:ruby2_keywords, :new)
end
end
end
end
Version data entries
205 entries across 205 versions & 1 rubygems