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Feature #3773

Updated by nahi (Hiroshi Nakamura) over 7 years ago

=begin

Not sure "parent" is the best name, it does seem like this functionality should be provided somehow by Ruby itself.

class Module
# Returns the name of the module containing this one.
#
# M::N.parent_name # => "M"
def parent_name
unless defined? @parent_name
@parent_name = name =~ /::[^:]+\Z/ ? $`.freeze : nil
end
@parent_name
end

# Returns the module which contains this one according to its name.
#
# module M
# module N
# end
# end
# X = M::N
#
# M::N.parent # => M
# X.parent # => M
#
# The parent of top-level and anonymous modules is Object.
#
# M.parent # => Object
# Module.new.parent # => Object
#
def parent
parent_name ? constant(parent_name) : Object
end

# Returns all the parents of this module according to its name, ordered from
# nested outwards. The receiver is not contained within the result.
#
# module M
# module N
# end
# end
# X = M::N
#
# M.parents # => [Object]
# M::N.parents # => [M, Object]
# X.parents # => [M, Object]
#
def parents
parents = []
if parent_name
parts = parent_name.split('::')
until parts.empty?
parents << constant(parts * '::')
parts.pop
end
end
parents << Object unless parents.include? Object
parents
end

end

=end

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