yugui (owner)

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gist: 33963 Download_button fork
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Description:
How meta^n classes work in Ruby 1.9. This requires http://github.com/yugui/evil-ruby/tree/master .
Public Clone URL: git://gist.github.com/33963.git
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require 'test/unit'
require '/Users/yugui/dev/evil-ruby/lib/evil'
 
class Object
  alias_method :c, :actual_class
end
class Class
  alias_method :s, :actual_superclass
end
class Foo; end
class Bar < Foo; end
class TestMetaclass < Test::Unit::TestCase
	def assert_equal(expected, obj)
		super(expected, obj.inspect)
	end
	def assert_match(expected, obj)
		super(expected, obj.inspect)
	end
 
  def test_bar
		bar = Bar.new
		assert_match /#<Bar:0x[0-9a-f]+>/,  					bar
		assert_equal "Bar",            								bar.c
		assert_equal "#<Class:Bar>", 									bar.c.c
		assert_equal "#<Class:Class>", 								bar.c.c.c
		assert_equal "#<Class:#<Class:Class>>", 			bar.c.c.c.c
		assert_equal "#<Class:#<Class:Class>>", 			bar.c.c.c.c.c
 
		assert_equal "#<Class:#<Class:Module>>", 			bar.c.c.c.c.s
		assert_equal "#<Class:#<Class:Object>>", 			bar.c.c.c.c.s.s
		assert_equal "#<Class:#<Class:BasicObject>>",	bar.c.c.c.c.s.s.s
		assert_equal "#<Class:Class>", 								bar.c.c.c.c.s.s.s.s
		assert_equal "#<Class:Module>", 							bar.c.c.c.c.s.s.s.s.s
		assert_equal "#<Class:Object>", 							bar.c.c.c.c.s.s.s.s.s.s
		assert_equal "#<Class:BasicObject>", 					bar.c.c.c.c.s.s.s.s.s.s.s
		assert_equal "Class", 												bar.c.c.c.c.s.s.s.s.s.s.s.s
		assert_equal "Module", 												bar.c.c.c.c.s.s.s.s.s.s.s.s.s
		assert_equal "Object", 												bar.c.c.c.c.s.s.s.s.s.s.s.s.s.s
		#assert_equal "Kernel", 											bar.c.c.c.c.s.s.s.s.s.s.s.s.s.s.s
		#assert_equal "BasicObject", 									bar.c.c.c.c.s.s.s.s.s.s.s.s.s.s.s.s
		assert_equal "false", 							  				BasicObject.s
 
		assert_equal "#<Class:Foo>", 					bar.c.c.s
		assert_equal "#<Class:Object>", 			bar.c.c.s.s
 
		assert_equal "Foo",            				bar.c.s
		assert_equal "Object",            		bar.c.s.s
 
		#assert_equal "nonsense",							bar.s
 
 
		assert_equal "#<Class:#<Class:Class>>",					bar.c.c.c.c.s.c
		assert_equal "#<Class:#<Class:Class>>",					bar.c.c.c.c.s.s.c
		assert_equal "#<Class:#<Class:Class>>",					bar.c.c.c.c.s.s.s.c
		assert_equal "#<Class:#<Class:Class>>",					bar.c.c.c.c.s.s.s.s.c
		assert_equal "#<Class:#<Class:Module>>", 				bar.c.c.c.c.s.s.s.s.s.c      # class of #<Class:Module>
		assert_equal "#<Class:#<Class:Object>>", 				bar.c.c.c.c.s.s.s.s.s.s.c    # class of #<Class:Object>
		assert_equal "#<Class:#<Class:BasicObject>>", 	bar.c.c.c.c.s.s.s.s.s.s.s.c  # class of #<Class:BasicObject>
		assert_equal "#<Class:Class>", 									bar.c.c.c.c.s.s.s.s.s.s.s.s.c  # class of Class
		assert_equal "#<Class:Module>", 								bar.c.c.c.c.s.s.s.s.s.s.s.s.s.c  # class of Module
		assert_equal "#<Class:Object>", 								bar.c.c.c.c.s.s.s.s.s.s.s.s.s.s.c  # class of Object
		assert_equal "#<Class:BasicObject>", 						BasicObject.c
 
 
 
		meta = (class << bar; self end)
		assert bar.c == meta
		assert_match /#<Bar:0x[0-9a-f]+>/,  			  bar
		assert_match /#<Class:#<Bar:0x[0-9a-f]+>>/, bar.c
		assert_equal "#<Class:Bar>", 					bar.c.c
		assert_equal "#<Class:Class>", 				bar.c.c.c
	end
 
	def test_class
		bar = Bar
		assert_equal "Bar", bar
		assert_equal "#<Class:Bar>", bar.c
		assert_equal "Foo", bar.s
 
		meta = (class << Bar; self end)
		assert bar.c == meta
    assert_equal "#<Class:Bar>",                  meta
		assert_equal "Bar", 													bar
		assert_equal "#<Class:Bar>", 									bar.c
		assert_equal "#<Class:#<Class:Bar>>", 				bar.c.c
		assert_equal "#<Class:#<Class:Class>>", 			bar.c.c.c
		assert_equal "#<Class:#<Class:Class>>", 			bar.c.c.c.c
 
		assert_equal "#<Class:#<Class:Module>>", 			bar.c.c.c.s
		assert_equal "#<Class:#<Class:Object>>", 			bar.c.c.c.s.s
		assert_equal "#<Class:#<Class:BasicObject>>", bar.c.c.c.s.s.s
		assert_equal "#<Class:Class>", 								bar.c.c.c.s.s.s.s
		assert_equal "#<Class:Module>", 							bar.c.c.c.s.s.s.s.s
		assert_equal "#<Class:Object>", 							bar.c.c.c.s.s.s.s.s.s
		assert_equal "#<Class:BasicObject>", 					bar.c.c.c.s.s.s.s.s.s.s
		assert_equal "Class", 												bar.c.c.c.s.s.s.s.s.s.s.s
		assert_equal "Module", 												bar.c.c.c.s.s.s.s.s.s.s.s.s
		assert_equal "Object", 												bar.c.c.c.s.s.s.s.s.s.s.s.s.s
		#assert_equal "Kernel", 											bar.c.c.c.s.s.s.s.s.s.s.s.s.s.s
		#assert_equal "BasicObject", 									bar.c.c.c.s.s.s.s.s.s.s.s.s.s.s.s
		assert_equal "false",													BasicObject.s
 
		assert_equal "#<Class:#<Class:Foo>>", 				bar.c.c.s
		assert_equal "#<Class:#<Class:Object>>", 			bar.c.c.s.s
 
		assert_equal "Foo", 													bar.s
		assert_equal "Object", 												bar.s.s
 
 
		assert_equal "#<Class:#<Class:Class>>", 			bar.c.c.c.s.c    					# class of #<Class:#<Class:Module>>
		assert_equal "#<Class:#<Class:Class>>", 			bar.c.c.c.s.s.c 					# class of #<Class:#<Class:Object>>
		assert_equal "#<Class:#<Class:Class>>", 			bar.c.c.c.s.s.s.c   		# class of #<Class:#<Class:BasicObject>>
		assert_equal "#<Class:#<Class:Class>>", 			bar.c.c.c.s.s.s.s.c 		# class of #<Class:Class>
		assert_equal "#<Class:#<Class:Module>>", 			bar.c.c.c.s.s.s.s.s.c 	# class of #<Class:Module>
		assert_equal "#<Class:#<Class:Object>>", 			bar.c.c.c.s.s.s.s.s.s.c # class of #<Class:Object>
		assert_equal "#<Class:#<Class:BasicObject>>",	bar.c.c.c.s.s.s.s.s.s.s.c # class of #<Class:BasicObject>
		assert_equal "#<Class:Class>",								bar.c.c.c.s.s.s.s.s.s.s.s.c # class of Class
		assert_equal "#<Class:Module>",								bar.c.c.c.s.s.s.s.s.s.s.s.s.c # class of Module
		assert_equal "#<Class:Object>",								bar.c.c.c.s.s.s.s.s.s.s.s.s.s.c # class of Object
		assert_equal "#<Class:BasicObject>",					BasicObject.c # class of BasicObject
	end
 
  def test_metaclass
    bar = (class << Bar; self end)
    assert_equal "#<Class:Bar>", bar
    assert_equal "#<Class:#<Class:Bar>>", bar.c
    assert_equal "#<Class:Foo>", bar.s
 
    meta = (class << bar; self end)
    assert bar.c == meta
    assert_equal "#<Class:#<Class:Bar>>",                   meta
    assert_equal "#<Class:Bar>",                            bar
    assert_equal "#<Class:#<Class:Bar>>",                   bar.c
    assert_equal "#<Class:#<Class:#<Class:Bar>>>",          bar.c.c
    assert_equal "#<Class:#<Class:#<Class:Class>>>",        bar.c.c.c
    assert_equal "#<Class:#<Class:#<Class:Class>>>",        bar.c.c.c.c
 
    assert_equal "#<Class:#<Class:#<Class:Module>>>",       bar.c.c.c.s
    assert_equal "#<Class:#<Class:#<Class:Object>>>",       bar.c.c.c.s.s
    assert_equal "#<Class:#<Class:#<Class:BasicObject>>>",  bar.c.c.c.s.s.s
    assert_equal "#<Class:#<Class:Class>>",                 bar.c.c.c.s.s.s.s
    assert_equal "#<Class:#<Class:Module>>",                bar.c.c.c.s.s.s.s.s
    assert_equal "#<Class:#<Class:Object>>",                bar.c.c.c.s.s.s.s.s.s
    assert_equal "#<Class:#<Class:BasicObject>>",           bar.c.c.c.s.s.s.s.s.s.s
    assert_equal "#<Class:Class>",                          bar.c.c.c.s.s.s.s.s.s.s.s
    assert_equal "#<Class:Module>",                         bar.c.c.c.s.s.s.s.s.s.s.s.s
    assert_equal "#<Class:Object>",                         bar.c.c.c.s.s.s.s.s.s.s.s.s.s
    assert_equal "#<Class:BasicObject>",                    bar.c.c.c.s.s.s.s.s.s.s.s.s.s.s
    assert_equal "Class",                                   bar.c.c.c.s.s.s.s.s.s.s.s.s.s.s.s
    assert_equal "Module",                                  bar.c.c.c.s.s.s.s.s.s.s.s.s.s.s.s.s
    assert_equal "Object",                                  bar.c.c.c.s.s.s.s.s.s.s.s.s.s.s.s.s.s
    #assert_equal "Kernel",                                 bar.c.c.c.s.s.s.s.s.s.s.s.s.s.s.s.s.s.s
    #assert_equal "BasicObject",                            bar.c.c.c.s.s.s.s.s.s.s.s.s.s.s.s.s.s.s.s
    assert_equal "false",                                   BasicObject.s
 
    assert_equal "#<Class:#<Class:#<Class:Foo>>>",          bar.c.c.s
    assert_equal "#<Class:#<Class:#<Class:Object>>>",       bar.c.c.s.s
 
    assert_equal "#<Class:#<Class:Foo>>",          bar.c.s
    assert_equal "#<Class:#<Class:Object>>",       bar.c.s.s
 
    assert_equal "#<Class:Foo>",      bar.s
    assert_equal "#<Class:Object>",   bar.s.s
 
    assert_equal "#<Class:#<Class:#<Class:Class>>>",        bar.c.c.c.s.c           # class of #<Class:#<Class:#<Class:Module>>>" 
    assert_equal "#<Class:#<Class:#<Class:Class>>>",        bar.c.c.c.s.s.c         # class of "#<Class:#<Class:#<Class:Object>>>"
    assert_equal "#<Class:#<Class:#<Class:Class>>>",        bar.c.c.c.s.s.s.c       # class of "#<Class:#<Class:#<Class:BasicObject>>>"
    assert_equal "#<Class:#<Class:#<Class:Class>>>",        bar.c.c.c.s.s.s.s.c     # class of "#<Class:#<Class:Class>>"
    assert_equal "#<Class:#<Class:#<Class:Module>>>",       bar.c.c.c.s.s.s.s.s.c   # class of "#<Class:#<Class:Module>>"
    assert_equal "#<Class:#<Class:#<Class:Object>>>",       bar.c.c.c.s.s.s.s.s.s.c # class of "#<Class:#<Class:Object>>"
    assert_equal "#<Class:#<Class:#<Class:BasicObject>>>",  bar.c.c.c.s.s.s.s.s.s.s.c # class of "#<Class:#<Class:BasicObject>>"
    assert_equal "#<Class:#<Class:Class>>",                 bar.c.c.c.s.s.s.s.s.s.s.s.c # class of "#<Class:Class>"
    assert_equal "#<Class:#<Class:Module>>",                bar.c.c.c.s.s.s.s.s.s.s.s.s.c # class of "#<Class:Module>"
    assert_equal "#<Class:#<Class:Object>>",                bar.c.c.c.s.s.s.s.s.s.s.s.s.s.c # class of "#<Class:Object>"
    assert_equal "#<Class:#<Class:BasicObject>>",           bar.c.c.c.s.s.s.s.s.s.s.s.s.s.s.c # class of "#<Class:BasicObject>"
    assert_equal "#<Class:Class>",                          bar.c.c.c.s.s.s.s.s.s.s.s.s.s.s.s.c # class of "Class"
    assert_equal "#<Class:Module>",                         bar.c.c.c.s.s.s.s.s.s.s.s.s.s.s.s.s.c # class of "Module"
    assert_equal "#<Class:Object>",                         bar.c.c.c.s.s.s.s.s.s.s.s.s.s.s.s.s.s.c # class of "Object"
		assert_equal "#<Class:BasicObject>",					          BasicObject.c # class of BasicObject
  end
end