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Size: 1.27 KB
Versions: 51
Compression:
Stored size: 1.27 KB
Contents
# frozen_string_literal: true
class Class
begin
# Test if this Ruby supports each_object against singleton_class
ObjectSpace.each_object(Numeric.singleton_class) { }
# Returns an array with all classes that are < than its receiver.
#
# class C; end
# C.descendants # => []
#
# class B < C; end
# C.descendants # => [B]
#
# class A < B; end
# C.descendants # => [B, A]
#
# class D < C; end
# C.descendants # => [B, A, D]
def descendants
descendants = []
ObjectSpace.each_object(singleton_class) do |k|
next if k.singleton_class?
descendants.unshift k unless k == self
end
descendants
end
rescue StandardError # JRuby 9.0.4.0 and earlier
def descendants
descendants = []
ObjectSpace.each_object(Class) do |k|
descendants.unshift k if k < self
end
descendants.uniq!
descendants
end
end
# Returns an array with the direct children of +self+.
#
# class Foo; end
# class Bar < Foo; end
# class Baz < Bar; end
#
# Foo.subclasses # => [Bar]
def subclasses
subclasses, chain = [], descendants
chain.each do |k|
subclasses << k unless chain.any? { |c| c > k }
end
subclasses
end
end
Version data entries
51 entries across 49 versions & 7 rubygems