# -*- coding: iso-8859-1 -*-

import unittest, test.test_support

import sys, cStringIO

class SysModuleTest(unittest.TestCase):

    def test_original_displayhook(self):

        import __builtin__

        savestdout = sys.stdout

        out = cStringIO.StringIO()

        sys.stdout = out

        dh = sys.__displayhook__

        self.assertRaises(TypeError, dh)

        if hasattr(__builtin__, "_"):

            del __builtin__._

        dh(None)

        self.assertEqual(out.getvalue(), "")

        self.assert_(not hasattr(__builtin__, "_"))

        dh(42)

        self.assertEqual(out.getvalue(), "42\n")

        self.assertEqual(__builtin__._, 42)

        del sys.stdout

        self.assertRaises(RuntimeError, dh, 42)

        sys.stdout = savestdout

    def test_lost_displayhook(self):

        olddisplayhook = sys.displayhook

        del sys.displayhook

        code = compile("42", "<string>", "single")

        self.assertRaises(RuntimeError, eval, code)

        sys.displayhook = olddisplayhook

    def test_custom_displayhook(self):

        olddisplayhook = sys.displayhook

        def baddisplayhook(obj):

            raise ValueError

        sys.displayhook = baddisplayhook

        code = compile("42", "<string>", "single")

        self.assertRaises(ValueError, eval, code)

        sys.displayhook = olddisplayhook

    def test_original_excepthook(self):

        savestderr = sys.stderr

        err = cStringIO.StringIO()

        sys.stderr = err

        eh = sys.__excepthook__

        self.assertRaises(TypeError, eh)

        try:

            raise ValueError(42)

        except ValueError, exc:

            eh(*sys.exc_info())

        sys.stderr = savestderr

        self.assert_(err.getvalue().endswith("ValueError: 42\n"))

    # FIXME: testing the code for a lost or replaced excepthook in

    # Python/pythonrun.c::PyErr_PrintEx() is tricky.

    def test_exc_clear(self):

        self.assertRaises(TypeError, sys.exc_clear, 42)

        # Verify that exc_info is present and matches exc, then clear it, and

        # check that it worked.

        def clear_check(exc):

            typ, value, traceback = sys.exc_info()

            self.assert_(typ is not None)

            self.assert_(value is exc)

            self.assert_(traceback is not None)

            sys.exc_clear()

            typ, value, traceback = sys.exc_info()

            self.assert_(typ is None)

            self.assert_(value is None)

            self.assert_(traceback is None)

        def clear():

            try:

                raise ValueError, 42

            except ValueError, exc:

                clear_check(exc)

        # Raise an exception and check that it can be cleared

        clear()

        # Verify that a frame currently handling an exception is

        # unaffected by calling exc_clear in a nested frame.

        try:

            raise ValueError, 13

        except ValueError, exc:

            typ1, value1, traceback1 = sys.exc_info()

            clear()

            typ2, value2, traceback2 = sys.exc_info()

            self.assert_(typ1 is typ2)

            self.assert_(value1 is exc)

            self.assert_(value1 is value2)

            self.assert_(traceback1 is traceback2)

        # Check that an exception can be cleared outside of an except block

        clear_check(exc)

    def test_exit(self):

        self.assertRaises(TypeError, sys.exit, 42, 42)

        # call without argument

        try:

            sys.exit(0)

        except SystemExit, exc:

            self.assertEquals(exc.code, 0)

        except:

            self.fail("wrong exception")

        else:

            self.fail("no exception")

        # call with tuple argument with one entry

        # entry will be unpacked

        try:

            sys.exit(42)

        except SystemExit, exc:

            self.assertEquals(exc.code, 42)

        except:

            self.fail("wrong exception")

        else:

            self.fail("no exception")

        # call with integer argument

        try:

            sys.exit((42,))

        except SystemExit, exc:

            self.assertEquals(exc.code, 42)

        except:

            self.fail("wrong exception")

        else:

            self.fail("no exception")

        # call with string argument

        try:

            sys.exit("exit")

        except SystemExit, exc:

            self.assertEquals(exc.code, "exit")

        except:

            self.fail("wrong exception")

        else:

            self.fail("no exception")

        # call with tuple argument with two entries

        try:

            sys.exit((17, 23))

        except SystemExit, exc:

            self.assertEquals(exc.code, (17, 23))

        except:

            self.fail("wrong exception")

        else:

            self.fail("no exception")

        # test that the exit machinery handles SystemExits properly

        import subprocess

        # both unnormalized...

        rc = subprocess.call([sys.executable, "-c",

                              "raise SystemExit, 46"])

        self.assertEqual(rc, 46)

        # ... and normalized

        rc = subprocess.call([sys.executable, "-c",

                              "raise SystemExit(47)"])

        self.assertEqual(rc, 47)

    def test_getdefaultencoding(self):

        if test.test_support.have_unicode:

            self.assertRaises(TypeError, sys.getdefaultencoding, 42)

            # can't check more than the type, as the user might have changed it

            self.assert_(isinstance(sys.getdefaultencoding(), str))

    # testing sys.settrace() is done in test_trace.py

    # testing sys.setprofile() is done in test_profile.py

    def test_setcheckinterval(self):

        self.assertRaises(TypeError, sys.setcheckinterval)

        orig = sys.getcheckinterval()

        for n in 0, 100, 120, orig: # orig last to restore starting state

            sys.setcheckinterval(n)

            self.assertEquals(sys.getcheckinterval(), n)

    def test_recursionlimit(self):

        self.assertRaises(TypeError, sys.getrecursionlimit, 42)

        oldlimit = sys.getrecursionlimit()

        self.assertRaises(TypeError, sys.setrecursionlimit)

        self.assertRaises(ValueError, sys.setrecursionlimit, -42)

        sys.setrecursionlimit(10000)

        self.assertEqual(sys.getrecursionlimit(), 10000)

        sys.setrecursionlimit(oldlimit)

    def test_getwindowsversion(self):

        if hasattr(sys, "getwindowsversion"):

            v = sys.getwindowsversion()

            self.assert_(isinstance(v, tuple))

            self.assertEqual(len(v), 5)

            self.assert_(isinstance(v[0], int))

            self.assert_(isinstance(v[1], int))

            self.assert_(isinstance(v[2], int))

            self.assert_(isinstance(v[3], int))

            self.assert_(isinstance(v[4], str))

    def test_dlopenflags(self):

        if hasattr(sys, "setdlopenflags"):

            self.assert_(hasattr(sys, "getdlopenflags"))

            self.assertRaises(TypeError, sys.getdlopenflags, 42)

            oldflags = sys.getdlopenflags()

            self.assertRaises(TypeError, sys.setdlopenflags)

            sys.setdlopenflags(oldflags+1)

            self.assertEqual(sys.getdlopenflags(), oldflags+1)

            sys.setdlopenflags(oldflags)

    def test_refcount(self):

        self.assertRaises(TypeError, sys.getrefcount)

        c = sys.getrefcount(None)

        n = None

        self.assertEqual(sys.getrefcount(None), c+1)

        del n

        self.assertEqual(sys.getrefcount(None), c)

        if hasattr(sys, "gettotalrefcount"):

            self.assert_(isinstance(sys.gettotalrefcount(), int))

    def test_getframe(self):

        self.assertRaises(TypeError, sys._getframe, 42, 42)

        self.assertRaises(ValueError, sys._getframe, 2000000000)

        self.assert_(

            SysModuleTest.test_getframe.im_func.func_code \

            is sys._getframe().f_code

        )

    # sys._current_frames() is a CPython-only gimmick.

    def test_current_frames(self):

        have_threads = True

        try:

            import thread

        except ImportError:

            have_threads = False

        if have_threads:

            self.current_frames_with_threads()

        else:

            self.current_frames_without_threads()

    # Test sys._current_frames() in a WITH_THREADS build.

    def current_frames_with_threads(self):

        import threading, thread

        import traceback

        # Spawn a thread that blocks at a known place.  Then the main

        # thread does sys._current_frames(), and verifies that the frames

        # returned make sense.

        entered_g = threading.Event()

        leave_g = threading.Event()

        thread_info = []  # the thread's id

        def f123():

            g456()

        def g456():

            thread_info.append(thread.get_ident())

            entered_g.set()

            leave_g.wait()

        t = threading.Thread(target=f123)

        t.start()

        entered_g.wait()

        # At this point, t has finished its entered_g.set(), although it's

        # impossible to guess whether it's still on that line or has moved on

        # to its leave_g.wait().

        self.assertEqual(len(thread_info), 1)

        thread_id = thread_info[0]

        d = sys._current_frames()

        main_id = thread.get_ident()

        self.assert_(main_id in d)

        self.assert_(thread_id in d)

        # Verify that the captured main-thread frame is _this_ frame.

        frame = d.pop(main_id)

        self.assert_(frame is sys._getframe())

        # Verify that the captured thread frame is blocked in g456, called

        # from f123.  This is a litte tricky, since various bits of

        # threading.py are also in the thread's call stack.

        frame = d.pop(thread_id)

        stack = traceback.extract_stack(frame)

        for i, (filename, lineno, funcname, sourceline) in enumerate(stack):

            if funcname == "f123":

                break

        else:

            self.fail("didn't find f123() on thread's call stack")

        self.assertEqual(sourceline, "g456()")

        # And the next record must be for g456().

        filename, lineno, funcname, sourceline = stack[i+1]

        self.assertEqual(funcname, "g456")

        self.assert_(sourceline in ["leave_g.wait()", "entered_g.set()"])

        # Reap the spawned thread.

        leave_g.set()

        t.join()

    # Test sys._current_frames() when thread support doesn't exist.

    def current_frames_without_threads(self):

        # Not much happens here:  there is only one thread, with artificial

        # "thread id" 0.

        d = sys._current_frames()

        self.assertEqual(len(d), 1)

        self.assert_(0 in d)

        self.assert_(d[0] is sys._getframe())

    def test_attributes(self):

        self.assert_(isinstance(sys.api_version, int))

        self.assert_(isinstance(sys.argv, list))

        self.assert_(sys.byteorder in ("little", "big"))

        self.assert_(isinstance(sys.builtin_module_names, tuple))

        self.assert_(isinstance(sys.copyright, basestring))

        self.assert_(isinstance(sys.exec_prefix, basestring))

        self.assert_(isinstance(sys.executable, basestring))

        self.assert_(isinstance(sys.hexversion, int))

        self.assert_(isinstance(sys.maxint, int))

        if test.test_support.have_unicode:

            self.assert_(isinstance(sys.maxunicode, int))

        self.assert_(isinstance(sys.platform, basestring))

        self.assert_(isinstance(sys.prefix, basestring))

        self.assert_(isinstance(sys.version, basestring))

        vi = sys.version_info

        self.assert_(isinstance(vi, tuple))

        self.assertEqual(len(vi), 5)

        self.assert_(isinstance(vi[0], int))

        self.assert_(isinstance(vi[1], int))

        self.assert_(isinstance(vi[2], int))

        self.assert_(vi[3] in ("alpha", "beta", "candidate", "final"))

        self.assert_(isinstance(vi[4], int))

    def test_43581(self):

        # Can't use sys.stdout, as this is a cStringIO object when

        # the test runs under regrtest.

        self.assert_(sys.__stdout__.encoding == sys.__stderr__.encoding)

def test_main():

    test.test_support.run_unittest(SysModuleTest)

if __name__ == "__main__":

    test_main()