#####################################################################################
#
# Copyright (c) Microsoft Corporation. 
#
# This source code is subject to terms and conditions of the Microsoft Public
# License. A  copy of the license can be found in the License.html file at the
# root of this distribution. If  you cannot locate the  Microsoft Public
# License, please send an email to  dlr@microsoft.com. By using this source
# code in any fashion, you are agreeing to be bound by the terms of the 
# Microsoft Public License.
#
# You must not remove this notice, or any other, from this software.
#
#####################################################################################

from lib.assert_util import *

import sys

def verify_file(ff):
    cnt = 0
    for i in ff:
        Assert(i[0:5] == "Hello")
        cnt += 1
    ff.close()
    Assert(cnt == 10)

f = file("testfile.tmp", "w")
for i in range(10):
    f.write("Hello " + str(i) + "\n")
f.close()

f = file("testfile.tmp")
verify_file(f)
f = file("testfile.tmp", "r")
verify_file(f)
f = file("testfile.tmp", "r", -1)
verify_file(f)
f = open("testfile.tmp")
verify_file(f)
f = open("testfile.tmp", "r")
verify_file(f)
f = open("testfile.tmp", "r", -1)
verify_file(f)
f = open("testfile.tmp", "r", 0)
verify_file(f)

if is_cli:
    import System
    fs = System.IO.FileStream("testfile.tmp", System.IO.FileMode.Open, System.IO.FileAccess.Read)
    f = open(fs)
    verify_file(f)
    
    ms = System.IO.MemoryStream(30)
    f = open(ms)
    f.write("hello")
    AreEqual(ms.Length, 5)
    AreEqual(ms.GetBuffer()[0], ord('h'))
    AreEqual(ms.GetBuffer()[4], ord('o'))
    ms.Close()

# more tests for 'open'
AssertError(TypeError, open, None) # arg must be string
AssertError(TypeError, open, [])
AssertError(TypeError, open, 1)

def max(a,b):
    if a>b: return a
    else: return b

code = compile("max(10, 15)", "<string>", "eval")
Assert(eval(code) == 15)

code = compile("x = [1,2,3,4,5]\nx.reverse()\nAssert(x == [5,4,3,2,1])", "<string>", "exec")
exec(code)
Assert(x == [5,4,3,2,1])

AssertError(ValueError, compile, "2+2", "<string>", "invalid")
AssertError(SyntaxError, compile, "if 1 < 2: pass", "<string>", "eval")
AssertError(SyntaxError, compile, "a=2", "<string>", "eval")

AssertError(SyntaxError, eval, "a=2")

# stdin, stdout redirect and input, raw_input tests

old_stdin = sys.stdin
old_stdout = sys.stdout
sys.stdout = file("testfile.tmp", "w")
print "Into the file"
print "2+2"
sys.stdout.close()
sys.stdout = old_stdout

sys.stdin = file("testfile.tmp", "r")
s = raw_input()
Assert(s == "Into the file")
s = input()
Assert(s == 4)
sys.stdin.close()
sys.stdin = old_stdin

f = file("testfile.tmp", "r")
g = file("testfile.tmp", "r")
s = f.readline()
t = g.readline()
Assert(s == t)
Assert(s == "Into the file\n")

f.close()
g.close()

f = file("testfile.tmp", "w")
f.writelines(["1\n", "2\n", "2\n", "3\n", "4\n", "5\n", "6\n", "7\n", "8\n", "9\n", "0\n"])
f.close()
f = file("testfile.tmp", "r")
l = f.readlines()
Assert(l == ["1\n", "2\n", "2\n", "3\n", "4\n", "5\n", "6\n", "7\n", "8\n", "9\n", "0\n"])
f.close()

# file newline handling test

def test_newline(norm, mode):
    f = file("testfile.tmp", mode)
    Assert(f.read() == norm)
    for x in xrange(len(norm)):
        f.seek(0)
        a = f.read(x)
        b = f.read(1)
        c = f.read()
        Assert(a+b+c == norm)
    f.close()

AssertError(TypeError, file, None) # arg must be string
AssertError(TypeError, file, [])
AssertError(TypeError, file, 1)

norm   = "Hi\nHello\nHey\nBye\nAhoy\n"
unnorm = "Hi\r\nHello\r\nHey\r\nBye\r\nAhoy\r\n"
f = file("testfile.tmp", "wb")
f.write(unnorm)
f.close()

test_newline(norm, "r")
test_newline(unnorm, "rb")



success=False
try:
    nstr("Hi")
except NameError:
    success=True
AreEqual(success, True)

success=False
try:
    zip2([1,2,3],[4,5,6])
except NameError:
    success=True
AreEqual(success, True)

AreEqual(str(), "")
AreEqual(unicode(), u"")

AreEqual(oct(long(0)), "0L")
AreEqual(hex(12297829382473034410), "0xAAAAAAAAAAAAAAAAL")
AreEqual(hex(-1L), "-0x1L")
AreEqual(long("-01L"), -1L)
AreEqual(int(" 1 "), 1)
AreEqual(int(" -   1  "), -1)
AreEqual(long("   -   1 "), -1L)

for f in [ long, int ]:
    AssertError(ValueError, f, 'p')
    AssertError(ValueError, f, 't')
    AssertError(ValueError, f, 'a')
    AssertError(ValueError, f, '3.2')
    AssertError(ValueError, f, '0x0R')
    AssertError(ValueError, f, '09', 8)
    AssertError(ValueError, f, '0A')
    AssertError(ValueError, f, '0x0G')

AssertError(ValueError, int, '1l')



AreEqual(int(1e100), 10000000000000000159028911097599180468360808563945281389781327557747838772170381060813469985856815104L)
AreEqual(int(-1e100), -10000000000000000159028911097599180468360808563945281389781327557747838772170381060813469985856815104L)



AreEqual(pow(2,3), 8)



#################
# Type properties
AreEqual(type(type), type.__class__)

#################


import sys

(old_copyright, old_byteorder) = (sys.copyright, sys.byteorder)
(sys.copyright, sys.byteorder) = ("foo", "foo")

(old_argv, old_exc_type) = (sys.argv, sys.exc_type)
(sys.argv, sys.exc_type) = ("foo", "foo")

reloaded_sys = reload(sys)

# Most attributes get reset
AreEqual((old_copyright, old_byteorder), (reloaded_sys.copyright, reloaded_sys.byteorder))
# Some attributes are not reset
AreEqual((reloaded_sys.argv, reloaded_sys.exc_type), ("foo", "foo"))
# Put back the original values
(sys.copyright, sys.byteorder) = (old_copyright, old_byteorder)
(sys.argv, sys.exc_type) = (old_argv, old_exc_type)


AreEqual(vars().keys().count('__file__'), 1)

# BUG 433: CPython allows hijacking of __builtins__, but IronPython does not
bug_433 = '''
def foo(arg):
    return "Foo"

# trying to override an attribute of __builtins__ causes a TypeError
try:
    __builtins__.oct = foo
    Assert(False, "Cannot override an attribute of __builtins__")
except TypeError:
    pass

# assigning to __builtins__ passes, but doesn't actually affect function semantics
import custombuiltins
'''
# /BUG


class MyMapping:
    def __getitem__(self, index):
            if index == 'a': return 2
            if index == 'b': return 5
            raise IndexError, 'bad index'

AreEqual(eval('a+b', {}, MyMapping()), 7)

# eval referencing locals / globals
value_a = 13
value_b = 17
global_value = 23
def eval_using_locals():
    value_a = 3
    value_b = 7
    AreEqual(eval("value_a"), 3)
    AreEqual(eval("value_b"), 7)
    AreEqual(eval("global_value"), 23)
    AreEqual(eval("value_a < value_b"), True)
    AreEqual(eval("global_value < value_b"), False)
    return True

Assert(eval_using_locals())

if is_cli: 
    if System.BitConverter.IsLittleEndian == True:
        Assert(sys.byteorder == "little")
    else:
        Assert(sys.byteorder == "big") 


sortedDir = 3
sortedDir = dir()
sortedDir.sort()
Assert(dir() == sortedDir)

## getattr/hasattr: hasattr should eat exception, and return True/False
class C1:
    def __init__(self):
        self.field = C1
    def method(self): 
        return "method"
    def __getattr__(self, attrname):
        if attrname == "lambda":
            return lambda x: len(x)
        elif attrname == "myassert":
            raise AssertionError
        else:
            raise AttributeError, attrname

class C2(object):             
    def __init__(self):
        self.field = C1
    def method(self): 
        return "method"
    def __getattr__(self, attrname):
        if attrname == "lambda":
            return lambda x: len(x)
        elif attrname == "myassert":
            raise AssertionError
        else:
            raise AttributeError, attrname

def test_getattr(t):
    o = t()
    AreEqual(getattr(o, "field"), C1)
    AreEqual(getattr(o, "method")(), "method")
    AreEqual(getattr(o, "lambda")("a"), 1)

    AssertError(AssertionError, getattr, o, "myassert")
    AssertError(AttributeError, getattr, o, "anything")
    AssertError(AttributeError, getattr, o, "else")

    for attrname in ('field', 'method', '__init__', '__getattr__', 'lambda', '__doc__', '__module__'):
        AreEqual(hasattr(o, attrname), True)

    for attrname in ("myassert", "anything", "else"): 
        AreEqual(hasattr(o,attrname), False)

test_getattr(C1)
test_getattr(C2)

## derived from python native type, and create instance of them without arg

flag = 0
def myinit(self): 
    global flag
    flag = flag + 1

cnt = 0
for bt in (tuple, dict, list, str, set, frozenset, int, float, complex):  
    nt = type("derived", (bt,), dict())
    inst = nt()
    AreEqual(type(inst), nt)
    
    nt2 = type("derived2", (nt,), dict())
    inst2 = nt2()
    AreEqual(type(inst2), nt2)

    nt.__init__ = myinit
    inst = nt()
    cnt += 1
    AreEqual(flag, cnt)
    AreEqual(type(inst), nt)


# override pow, delete it, and it should be gone
import operator
pow = 7
AreEqual(pow, 7)
del pow
AreEqual(operator.isCallable(pow), True)

try:
    del pow
    AreEqual(True,False)
except NameError:
    pass
    

# TypeError: tuple.__new__(str): str is not a subtype of tuple 
#!!!AssertError(TypeError, tuple.__new__, str)
#!!!AssertError(TypeError, tuple.__new__, str, 'abc')




# sub classing built-ins works correctly..

class MyFile(file):
    myfield = 0

f = MyFile('temporary.deleteme','w')
AreEqual(f.myfield, 0)
f.close()
import nt   
nt.unlink('temporary.deleteme')


class C(list):
    def __eq__(self, other):
        return 'Passed'

AreEqual(C() == 1, 'Passed')

# extensible types should hash the same as non-extensibles, and unary operators
# should work too
for x, y in ( (int, 2), (str, 'abc'), (float, 2.0), (long, 2L), (complex, 2+0j) ):
    class foo(x): pass
    
    AreEqual(hash(foo(y)), hash(y))
    
    if x != str: 
        AreEqual(-foo(y), -y)
        AreEqual(+foo(y), +y)
        
        if x != complex and x != float: 
            AreEqual(~foo(y), ~y)
    
    


# can use kw-args w/ file    

f = file(name='temporary.deleteme', mode='w')
f.close()
nt.unlink('temporary.deleteme')



AreEqual(int(x=1), 1)
AreEqual(float(x=2), 2.0)
AreEqual(long(x=3), 3L)
AreEqual(complex(imag=4, real=3), 3 + 4j)
AreEqual(str(object=5), '5')
AreEqual(unicode(string='a', errors='strict'), 'a')
AreEqual(tuple(sequence=range(3)), (0,1,2))
AreEqual(list(sequence=(0,1)), [0,1])

#####################################################################

for (x, y) in [("2", int), (2, int), ("string", str), (None, int), (str, None), (int, 3), (int, (6, 7))]:
    AssertError(TypeError, lambda: issubclass(x, y))

if is_cli:    
	import clr
	
	Assert(issubclass(int, int))
	Assert(not issubclass(str, int))
	Assert(not issubclass(int, (str, str)))
	Assert(issubclass(int, (str, int)))
	
	Assert(str(None) == "None")
	Assert(issubclass(type(None),type(None)))
	Assert(str(type(None)) == "<type 'NoneType'>")
	Assert(str(1) == "1")
	Assert('__str__' in dir(None))
	
	def tryAssignToNoneAttr():
		None.__doc__ = "Nothing!"
	
	def tryAssignToNoneNotAttr():
		None.notanattribute = "";
	
	AssertError(AttributeError, tryAssignToNoneAttr)
	AssertError(AttributeError, tryAssignToNoneNotAttr)
	v = None.__doc__
	v = None.__new__
	v = None.__hash__
	AssertError(TypeError, type(None))
	
	import sys
	AreEqual(str(sys), "<module 'sys' (built-in)>")
	
	import time
	import toimport
	
	m = [type(sys), type(time), type(toimport)]
	for i in m:
		for j in m:
			Assert(issubclass(i,j))
	
	AssertError(TypeError, type, None, None, None) # arg 1 must be string
	AssertError(TypeError, type, "NewType", None, None) # arg 2 must be tuple
	AssertError(TypeError, type, "NewType", (), None) # arg 3 must be dict
	
	
	def splitTest():
		"string".split('')
	AssertError(ValueError, splitTest)

#####################################################################################
# IronPython does not allow extending System.Int64 and System.Boolean. So we have
# some directed tests for this.

if is_cli:
	import System
	
	def InheritFromType(t):
		class InheritedType(t): pass
		return InheritedType
	
	AssertError(TypeError, InheritFromType, System.Int64)
	AssertError(TypeError, InheritFromType, System.Boolean)
	
	# isinstance
	
	Assert(isinstance(System.Int64(), System.Int64) == True)
	Assert(isinstance(System.Boolean(), System.Boolean) == True)
	
	Assert(isinstance(1, System.Int64) == False)
	Assert(isinstance(1, System.Boolean) == False)
	
	class userClass(object): pass
	Assert(isinstance(userClass(), System.Int64) == False)
	Assert(isinstance(userClass(), System.Boolean) == False)
	
	# issubclass
	
	Assert(issubclass(System.Int64, System.Int64) == True)
	Assert(issubclass(System.Boolean, System.Boolean) == True)
	
	Assert(issubclass(type(1), System.Int64) == False)
	Assert(issubclass(type(1), System.Boolean) == False)
	
	Assert(issubclass(userClass, System.Int64) == False)
	Assert(issubclass(userClass, System.Boolean) == False)

#####################################################################################

if is_cli:
	import System
	arrayMapping = {'b': System.SByte, 'h': System.Int16, 'H': System.UInt16, 'i': System.Int32,
					'I': System.UInt32, 'l': System.Int64, 'L': System.UInt64, 'f': System.Single, 'd': System.Double }
					
	def tryConstructValues(validate, *args):
		for x in arrayMapping.keys():
			# construct from DynamicType
			y = System.Array[arrayMapping[x]](*args)
			AreEqual(y.GetType().GetElementType(), arrayMapping[x]().GetType())
			validate(y, *args)
	
			# construct from CLR type
			y = System.Array[y.GetType().GetElementType()](*args)
			AreEqual(y.GetType().GetElementType(), arrayMapping[x]().GetType())
			validate(y, *args)
				
	
	def tryConstructSize(validate, *args):
		for x in arrayMapping.keys():
			# construct from DynamicType
			y = System.Array.CreateInstance(arrayMapping[x], *args)
			AreEqual(y.GetType().GetElementType(), arrayMapping[x]().GetType())
			validate(y, *args)
		
			# construct from CLR type
			y = System.Array.CreateInstance(y.GetType().GetElementType(), *args)
			AreEqual(y.GetType().GetElementType(), arrayMapping[x]().GetType())
			validate(y, *args)
				
	
	def validateLen(res, *args):
		AreEqual(len(res), *args)
	
	def validateVals(res, *args): 
		len(res) == len(args)
		for x in range(len(args[0])):
			try:
				lhs = int(res[x])
				rhs = int(args[0][x])
			except:
				lhs = float(res[x])
				rhs = float(args[0][x])
			AreEqual(lhs, rhs)
	
	def validateValsIter(res, *args): 
		len(res) == len(args)    
		for x in range(len(args)):
			print int(res[x]), args[0][x]
			AreEqual(int(res[x]), int(args[0][x]))
		
		
	class MyList(object):
		def __len__(self): 
			return 4
		def __iter__(self):
			yield 3
			yield 4
			yield 5
			yield 6
	
	def validateValsIter(res, *args): 
		compList = MyList()
		len(res) == len(args)    
		index = 0
		for x in compList:
			try:
				lhs = int(res[index])
				rhs = int(x)
			except Exception, e:
				lhs = float(res[index])
				rhs = float(x)
			
			AreEqual(lhs, rhs)
			index += 1
		
		
			
	tryConstructSize(validateLen, 0)
	tryConstructSize(validateLen, 1)
	tryConstructSize(validateLen, 20)
	
	tryConstructValues(validateVals, (3,4,5,6))
	tryConstructValues(validateVals, [3,4,5,6])
	
	tryConstructValues(validateValsIter, MyList())


#############################################
# metaclass tests

# normal meta class construction & initialization
metaInit = False
instInit = False
class MetaType(type):
    def someFunction(cls): 
        return "called someFunction"
    def __init__(cls, name, bases, dct):
        global metaInit
        metaInit = True
        super(MetaType, cls).__init__(name, bases,dct)
        cls.xyz = 'abc'
        
class MetaInstance(object):
    __metaclass__ = MetaType
    def __init__(self):
        global instInit
        instInit = True
        
a = MetaInstance()
AreEqual(metaInit, True)
AreEqual(instInit, True)

AreEqual(MetaInstance.xyz, 'abc')
AreEqual(MetaInstance.someFunction(), "called someFunction")


class MetaInstance(object):
    __metaclass__ = MetaType
    def __init__(self, xyz):
        global instInit
        instInit = True
        self.val = xyz
        
metaInit = False
instInit = False

a = MetaInstance('def')
AreEqual(instInit, True)
AreEqual(MetaInstance.xyz, 'abc')
AreEqual(a.val, 'def')
AreEqual(MetaInstance.someFunction(), "called someFunction")

# initialization by calling the metaclass type.

Foo = MetaType('foo', (), {})

AreEqual(type(Foo), MetaType)

instInit = False
def newInit(self):
    global instInit
    instInit = True
    
Foo = MetaType('foo', (), {'__init__':newInit})
a = Foo()
AreEqual(instInit, True)
    


# verify two instances of an old class compare differently

class C: pass

a = C()
b = C()

AreEqual(cmp(a,b) == 0, False)

#################################################################    
# check that unhashable types cannot be hashed by Python
# However, they should be hashable using System.Object.GetHashCode

if is_cli:
	import System
	class OldUserClass:
		def foo(): pass
	import _weakref
	import collections
	
	AssertError(TypeError, hash, slice(None))
	hashcode = System.Object.GetHashCode(slice(None))
	
	# weakproxy
	AssertError(TypeError, hash, _weakref.proxy(OldUserClass()))
	hashcode = System.Object.GetHashCode(_weakref.proxy(OldUserClass()))
	
	# weakcallableproxy
	AssertError(TypeError, hash, _weakref.proxy(OldUserClass().foo))
	hashcode = System.Object.GetHashCode(_weakref.proxy(OldUserClass().foo))
	
	AssertError(TypeError, hash, collections.deque())
	hashcode = System.Object.GetHashCode(collections.deque())
	
	AssertError(TypeError, hash, dict())
	hashcode = System.Object.GetHashCode(dict())
	
	AssertError(TypeError, hash, list())
	hashcode = System.Object.GetHashCode(list())
	
	AssertError(TypeError, hash, set())
	hashcode = System.Object.GetHashCode(set())

#################################################################    
# Check that attributes of built-in types cannot be deleted

if is_cli:
	import System
	def AssignMethodOfBuiltin():
		def mylen(): pass
		l = list()
		l.len = mylen
	AssertError(AttributeError, AssignMethodOfBuiltin)
	
	def DeleteMethodOfBuiltin():
		l = list()
		del l.len
	AssertError(AttributeError, DeleteMethodOfBuiltin)
	
	def SetAttrOfBuiltin():
		l = list()
		l.attr = 1
	AssertError(AttributeError, SetAttrOfBuiltin)
	
	def SetDictElementOfBuiltin():
		l = list()
		l.__dict__["attr"] = 1
	AssertError(AttributeError, SetDictElementOfBuiltin)
	
	def SetAttrOfCLIType():
		d = System.DateTime()
		d.attr = 1
	AssertError(AttributeError, SetAttrOfCLIType)
	
	def SetDictElementOfCLIType():
		d = System.DateTime()
		d.__dict__["attr"] = 1
	AssertError(AttributeError, SetDictElementOfCLIType)
	
	AssertErrorWithMessage(TypeError, "vars() argument must have __dict__ attribute", vars, list())
	AssertErrorWithMessage(TypeError, "vars() argument must have __dict__ attribute", vars, System.DateTime())

#################################################################    
# verify a class w/ explicit interface implementation gets
# it's interfaces shown

if is_cli:
	import System
	AreEqual(System.IConvertible.ToDouble('32', None), 32.0)


#################################################################    
# Value types are now immutable (at least through attribute sets)

if is_cli:
	load_iron_python_test()
	from IronPythonTest import *
	
	direct_vt = MySize(1, 2)
	embedded_vt = BaseClass()
	embedded_vt.Width = 3
	embedded_vt.Height = 4
	
	# Read access should still succeed.
	AreEqual(direct_vt.width, 1)
	AreEqual(embedded_vt.size.width, 3)
	AreEqual(embedded_vt.Size.width, 3)
	
	# But writes to value type fields should fail with ValueError.
	success = 0
	try:
		direct_vt.width = 5
	except ValueError:
		success = 1
	Assert(success == 1 and direct_vt.width == 1)
	
	success = 0
	try:
		embedded_vt.size.width = 5
	except ValueError:
		success = 1
	Assert(success == 1 and embedded_vt.size.width == 3)
	
	success = 0
	try:
		embedded_vt.Size.width = 5
	except ValueError:
		success = 1
	Assert(success == 1 and embedded_vt.Size.width == 3)
	
	import clr
	# ensure .GetType() and calling the helper w/ the type work
	AreEqual(clr.GetClrType(str), ''.GetType())
    # and ensure we're not just auto-converting back on both of them
	Assert(clr.GetClrType(str) != str)
    
    # as well as GetPythonType
	import System
	AreEqual(clr.GetPythonType(System.Int32), int)
	AreEqual(clr.GetPythonType(clr.GetClrType(int)), int)


	# verify we can't create *Ops classes    
	from IronPython.Runtime.Operations import FloatOps
	AssertError(TypeError, FloatOps)
		
	
	# setting mro to an invalid value should result in
	# bases still being correct
	class foo(object): pass
	
	class bar(foo): pass
	
	class baz(foo): pass
	
	def changeBazBase():
		baz.__bases__ = (foo, bar)  # illegal MRO
	
	AssertError(TypeError, changeBazBase)
	
	AreEqual(baz.__bases__, (foo, ))
	AreEqual(baz.__mro__, (baz, foo, object))
	
	d = {}
	d[None, 1] = 2
	AreEqual(d, {(None, 1): 2})

#######################################################
# Test for type of System.Int32.MinValue
AreEqual(type(-2147483648), int)
AreEqual(type(-(2147483648)), long)
AreEqual(type(-2147483648L), long)
AreEqual(type(-0x80000000), long)

AreEqual(type(int('-2147483648')), int)
AreEqual(type(int('-80000000', 16)), int)
AreEqual(type(int('-2147483649')), long)
AreEqual(type(int('-80000001', 16)), long)


if is_cli:
	import clr
	import System
	
	# verify our str.split doesn't replace CLR's String.Split
	chars = System.Array[str]([' '])
	res = 'a b  c'.Split(chars, System.StringSplitOptions.RemoveEmptyEntries)
	AreEqual(res[0], 'a')
	AreEqual(res[1], 'b')
	AreEqual(res[2], 'c')


#######################################################
# MRO Tests

# valid
class C(object): pass

class D(object): pass

class E(D): pass

class F(C, E): pass

AreEqual(F.__mro__, (F,C,E,D,object))

# valid
class A(object): pass

class B(object): pass

class C(A,B): pass

class D(A,B): pass

class E(C,D): pass

AreEqual(E.__mro__, (E,C,D,A,B,object))

# invalid
class A(object): pass

class B(object): pass

class C(A,B): pass

class D(B,A): pass

try:
    class E(C,D): pass
    AssertUnreachable()
except TypeError:
    pass
    

#######################################################
# calling a type w/ kw-args
AreEqual(complex(real=2), (2+0j))


#######################################################
try:
    2.0 + "2.0"
    AssertUnreachable()
except TypeError: pass

#### (sometype).__class__ should be defined and correct

class foo(object): pass

AreEqual(foo.__class__, type)

class foo(type): pass

class bar(object):
    __metaclass__ = foo
    
AreEqual(bar.__class__, foo)


#### metaclass order:

metaCalled = []
class BaseMeta(type):
    def __new__(cls, name, bases, dict):
        global metaCalled
        metaCalled.append(cls)
        return type.__new__(cls, name, bases, dict)
        
class DerivedMeta(BaseMeta): pass

class A:
    __metaclass__ = BaseMeta
    
AreEqual(metaCalled, [BaseMeta])

metaCalled = []
    
class B: 
    __metaclass__ = DerivedMeta
    
AreEqual(metaCalled, [DerivedMeta])    

metaCalled = []
class C(A,B): pass

AreEqual(metaCalled, [BaseMeta, DerivedMeta])
AreEqual(type(C).__name__, 'DerivedMeta')


class E(object):
    def getbases(self):
        raise RuntimeError
    __bases__ = property(getbases)

class I(object):
    def getclass(self):
        return E()
    __class__ = property(getclass)

class C(object):
    def getbases(self):
        return ()
    __bases__ = property(getbases)

AssertError(RuntimeError, isinstance, I(), C())

class C1(object): pass
class C2(object): pass


AreEqual(isinstance(C1(), C2), False)
AreEqual(isinstance(C1(), (C2, C2)), False)
AreEqual(isinstance(C1(), (C2, C2, (C2, C2), C2)), False)
AreEqual(isinstance(C1(), (C2, C2, (C2, (C2, C1), C2), C2)), True)

class C1: pass
class C2: pass


AreEqual(isinstance(C1(), C2), False)
AreEqual(isinstance(C1(), (C2, C2)), False)
AreEqual(isinstance(C1(), (C2, C2, (C2, C2), C2)), False)
AreEqual(isinstance(C1(), (C2, C2, (C2, (C2, C1), C2), C2)), True)

class MyInt(int): pass

Assert(isinstance(MyInt(), int))

# __class__ accesses

call_tracker = []
class C(object):
    def getclass(self):
        call_tracker.append("C.getclass")
        return C
    __class__ = property(getclass)

AreEqual(isinstance(C(), object), True)
AreEqual(call_tracker, [])

AreEqual(isinstance(C(), str), False)
AreEqual(call_tracker, ["C.getclass"])

call_tracker = []
AreEqual(isinstance(C(), (str, (type, str, float))), False)
AreEqual(call_tracker, ['C.getclass', 'C.getclass', 'C.getclass', 'C.getclass'])


# __bases__ access

call_tracker = []

class C(object):
    def getbases(self):
        call_tracker.append("C.getbases")
        return (E,)
    __bases__ = property(getbases)

class E(object):
    def getbases(self):
        call_tracker.append("E.getbases")
        return ()
    __bases__ = property(getbases)

class D(object):
    def getclass(self):
        call_tracker.append("D.getclass")
        return C()
    __class__ = property(getclass)

AreEqual(isinstance(D(), E()), False)
AreEqual(call_tracker, ['E.getbases', 'D.getclass', 'C.getbases'])

class I(object):
    def getclass(self):
        return None
    __class__ = property(getclass)

class C(object):
    def getbases(self):
        return ()
    __bases__ = property(getbases)

AssertError(TypeError, isinstance, I(), None)
AssertError(TypeError, isinstance, 3, None)
AssertError(TypeError, issubclass, int, None)