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class Module
# Returns the module which contains this one according to its name.
#
# module M
# module N
# end
# end
# X = M::N
#
# p M::N.parent # => M
# p X.parent # => M
#
# The parent of top-level and anonymous modules is Object.
#
# p M.parent # => Object
# p Module.new.parent # => Object
#
def parent
parent_name = name.split('::')[0..-2] * '::'
parent_name.empty? ? Object : parent_name.constantize
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
#
# p M.parents # => [Object]
# p M::N.parents # => [M, Object]
# p X.parents # => [M, Object]
#
def parents
parents = []
parts = name.split('::')[0..-2]
until parts.empty?
parents << (parts * '::').constantize
parts.pop
end
parents << Object unless parents.include? Object
parents
end
if RUBY_VERSION < '1.9'
# Returns the constants that have been defined locally by this object and
# not in an ancestor. This method is exact if running under Ruby 1.9. In
# previous versions it may miss some constants if their definition in some
# ancestor is identical to their definition in the receiver.
def local_constants
inherited = {}
ancestors.each do |anc|
next if anc == self
anc.constants.each { |const| inherited[const] = anc.const_get(const) }
end
constants.select do |const|
!inherited.key?(const) || inherited[const].object_id != const_get(const).object_id
end
end
else
def local_constants #:nodoc:
constants(false)
end
end
# Returns the names of the constants defined locally rather than the
# constants themselves. See <tt>local_constants</tt>.
def local_constant_names
local_constants.map { |c| c.to_s }
end
end
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