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Contents
#--
# Author:: Tyler Rick
# Copyright:: Copyright (c) 2007 QualitySmith, Inc.
# License:: Ruby License
# Submit to Facets?:: Yes.
# Developer notes::
# * May not have taken every single case into consideration. Needs a bit more testing.
# * public/private/protected?
# * Tests for this method can be found in ../object/ancestry_of_method.rb . It made more sense to test those two methods together;
# yet it's still to _use_ module/ancestry_of_instance_method.rb without using ../object/ancestry_of_method.rb.
#++
class Module
# Returns the module/class which defined the given instance method. If more than one module/class defined the method, returns the _closest_
# ancestor to have defined it (would be +self+ if it is defined in +self+).
#
# This looks at the results of <tt>instance_methods</tt>, which means that if you call this on a module/class, it will _only_ look
# at _instance_ methods. Thus, (unlike +ancestry_of_method+) it _only_ makes sense to call this method on modules/classes,
# not _instances_ of those modules/classes.
#
# Example:
# class Base
# def it; end
# end
# class SubWithIt < Base
# def it; end
# end
# class SubWithoutIt < Base
# end
# SubWithIt.ancestors # => [SubWithIt, Base, Object, Kernel]
# SubWithIt.ancestry_of_instance_method(:it) # => SubWithIt # (Stops with self)
# SubWithoutIt.ancestry_of_instance_method(:it) # => Base # (Goes one step up the ancestry tree)
#
# Returns nil if it cannot be found in self or in any ancestor.
def ancestry_of_instance_method(method_name)
method_name = method_name.to_s
self.ancestors.find do |ancestor|
ancestor.instance_methods(false).include? method_name
end
end
end
Version data entries
7 entries across 7 versions & 2 rubygems