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class Module
# Return the module which contains this one; if this is a root module, such as
# +::MyModule+, then Object is returned.
def parent
parent_name = name.split('::')[0..-2] * '::'
parent_name.empty? ? Object : parent_name.constantize
end
# Return all the parents of this module, ordered from nested outwards. The
# receiver is not contained within the result.
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
# Return the constants that have been defined locally by this object and not
# in an ancestor. This method may miss some constants if their definition in
# the 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
# 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(&:to_s)
end
end
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