import unittest

import os

import random

import shutil

import sys

import py_compile

import warnings

from test.test_support import unlink, TESTFN, unload, run_unittest, check_warnings

def remove_files(name):

    for f in (name + os.extsep + "py",

              name + os.extsep + "pyc",

              name + os.extsep + "pyo",

              name + os.extsep + "pyw",

              name + "$py.class"):

        if os.path.exists(f):

            os.remove(f)

class ImportTest(unittest.TestCase):

    def testCaseSensitivity(self):

        # Brief digression to test that import is case-sensitive:  if we got this

        # far, we know for sure that "random" exists.

        try:

            import RAnDoM

        except ImportError:

            pass

        else:

            self.fail("import of RAnDoM should have failed (case mismatch)")

    def testDoubleConst(self):

        # Another brief digression to test the accuracy of manifest float constants.

        from test import double_const  # don't blink -- that *was* the test

    def testImport(self):

        def test_with_extension(ext):

            # ext normally ".py"; perhaps ".pyw"

            source = TESTFN + ext

            pyo = TESTFN + os.extsep + "pyo"

            if sys.platform.startswith('java'):

                pyc = TESTFN + "$py.class"

            else:

                pyc = TESTFN + os.extsep + "pyc"

            f = open(source, "w")

            print >> f, "# This tests Python's ability to import a", ext, "file."

            a = random.randrange(1000)

            b = random.randrange(1000)

            print >> f, "a =", a

            print >> f, "b =", b

            f.close()

            try:

                try:

                    mod = __import__(TESTFN)

                except ImportError, err:

                    self.fail("import from %s failed: %s" % (ext, err))

                self.assertEquals(mod.a, a,

                    "module loaded (%s) but contents invalid" % mod)

                self.assertEquals(mod.b, b,

                    "module loaded (%s) but contents invalid" % mod)

            finally:

                os.unlink(source)

            try:

                try:

                    reload(mod)

                except ImportError, err:

                    self.fail("import from .pyc/.pyo failed: %s" % err)

            finally:

                try:

                    os.unlink(pyc)

                except OSError:

                    pass

                try:

                    os.unlink(pyo)

                except OSError:

                    pass

                del sys.modules[TESTFN]

        sys.path.insert(0, os.curdir)

        try:

            test_with_extension(os.extsep + "py")

            if sys.platform.startswith("win"):

                for ext in ".PY", ".Py", ".pY", ".pyw", ".PYW", ".pYw":

                    test_with_extension(ext)

        finally:

            del sys.path[0]

    def testImpModule(self):

        # Verify that the imp module can correctly load and find .py files

        import imp

        x = imp.find_module("os")

        os = imp.load_module("os", *x)

    def test_module_with_large_stack(self, module='longlist'):

        # create module w/list of 65000 elements to test bug #561858

        filename = module + os.extsep + 'py'

        # create a file with a list of 65000 elements

        f = open(filename, 'w+')

        f.write('d = [\n')

        for i in range(65000):

            f.write('"",\n')

        f.write(']')

        f.close()

        # compile & remove .py file, we only need .pyc (or .pyo)

        f = open(filename, 'r')

        py_compile.compile(filename)

        f.close()

        os.unlink(filename)

        # need to be able to load from current dir

        sys.path.append('')

        # this used to crash

        exec 'import ' + module

        # cleanup

        del sys.path[-1]

        for ext in 'pyc', 'pyo':

            fname = module + os.extsep + ext

            if os.path.exists(fname):

                os.unlink(fname)

    def test_failing_import_sticks(self):

        source = TESTFN + os.extsep + "py"

        f = open(source, "w")

        print >> f, "a = 1/0"

        f.close()

        # New in 2.4, we shouldn't be able to import that no matter how often

        # we try.

        sys.path.insert(0, os.curdir)

        try:

            for i in 1, 2, 3:

                try:

                    mod = __import__(TESTFN)

                except ZeroDivisionError:

                    if TESTFN in sys.modules:

                        self.fail("damaged module in sys.modules on %i. try" % i)

                else:

                    self.fail("was able to import a damaged module on %i. try" % i)

        finally:

            sys.path.pop(0)

            remove_files(TESTFN)

    def test_failing_reload(self):

        # A failing reload should leave the module object in sys.modules.

        source = TESTFN + os.extsep + "py"

        f = open(source, "w")

        print >> f, "a = 1"

        print >> f, "b = 2"

        f.close()

        sys.path.insert(0, os.curdir)

        try:

            mod = __import__(TESTFN)

            self.assert_(TESTFN in sys.modules, "expected module in sys.modules")

            self.assertEquals(mod.a, 1, "module has wrong attribute values")

            self.assertEquals(mod.b, 2, "module has wrong attribute values")

            # On WinXP, just replacing the .py file wasn't enough to

            # convince reload() to reparse it.  Maybe the timestamp didn't

            # move enough.  We force it to get reparsed by removing the

            # compiled file too.

            remove_files(TESTFN)

            # Now damage the module.

            f = open(source, "w")

            print >> f, "a = 10"

            print >> f, "b = 20//0"

            f.close()

            self.assertRaises(ZeroDivisionError, reload, mod)

            # But we still expect the module to be in sys.modules.

            mod = sys.modules.get(TESTFN)

            self.failIf(mod is None, "expected module to still be in sys.modules")

            # We should have replaced a w/ 10, but the old b value should

            # stick.

            self.assertEquals(mod.a, 10, "module has wrong attribute values")

            self.assertEquals(mod.b, 2, "module has wrong attribute values")

        finally:

            sys.path.pop(0)

            remove_files(TESTFN)

            if TESTFN in sys.modules:

                del sys.modules[TESTFN]

    def test_infinite_reload(self):

        # Bug #742342 reports that Python segfaults (infinite recursion in C)

        #  when faced with self-recursive reload()ing.

        sys.path.insert(0, os.path.dirname(__file__))

        try:

            import infinite_reload

        finally:

            sys.path.pop(0)

    def test_import_name_binding(self):

        # import x.y.z binds x in the current namespace

        import test as x

        import test.test_support

        self.assert_(x is test, x.__name__)

        self.assert_(hasattr(test.test_support, "__file__"))

        # import x.y.z as w binds z as w

        import test.test_support as y

        self.assert_(y is test.test_support, y.__name__)

    def test_import_initless_directory_warning(self):

        with warnings.catch_warnings():

            # Just a random non-package directory we always expect to be

            # somewhere in sys.path...

            warnings.simplefilter('error', ImportWarning)

            self.assertRaises(ImportWarning, __import__, "site-packages")

    def test_importbyfilename(self):

        path = os.path.abspath(TESTFN)

        try:

            __import__(path)

        except ImportError, err:

            self.assertEqual("Import by filename is not supported.",

                              err.args[0])

        else:

            self.fail("import by path didn't raise an exception")

class PathsTests(unittest.TestCase):

    path = TESTFN

    def setUp(self):

        os.mkdir(self.path)

        self.syspath = sys.path[:]

    def tearDown(self):

        shutil.rmtree(self.path)

        sys.path = self.syspath

    # http://bugs.python.org/issue1293

    def test_trailing_slash(self):

        f = open(os.path.join(self.path, 'test_trailing_slash.py'), 'w')

        f.write("testdata = 'test_trailing_slash'")

        f.close()

        sys.path.append(self.path+'/')

        mod = __import__("test_trailing_slash")

        self.assertEqual(mod.testdata, 'test_trailing_slash')

        unload("test_trailing_slash")

class RelativeImport(unittest.TestCase):

    def tearDown(self):

        try:

            del sys.modules["test.relimport"]

        except:

            pass

    def test_relimport_star(self):

        # This will import * from .test_import.

        from . import relimport

        self.assertTrue(hasattr(relimport, "RelativeImport"))

    def test_issue3221(self):

        def check_absolute():

            exec "from os import path" in ns

        def check_relative():

            exec "from . import relimport" in ns

        # Check both OK with __package__ and __name__ correct

        ns = dict(__package__='test', __name__='test.notarealmodule')

        check_absolute()

        check_relative()

        # Check both OK with only __name__ wrong

        ns = dict(__package__='test', __name__='notarealpkg.notarealmodule')

        check_absolute()

        check_relative()

        # Check relative fails with only __package__ wrong

        ns = dict(__package__='foo', __name__='test.notarealmodule')

        with check_warnings() as w:

            check_absolute()

            self.assert_('foo' in str(w.message))

            self.assertEqual(w.category, RuntimeWarning)

        self.assertRaises(SystemError, check_relative)

        # Check relative fails with __package__ and __name__ wrong

        ns = dict(__package__='foo', __name__='notarealpkg.notarealmodule')

        with check_warnings() as w:

            check_absolute()

            self.assert_('foo' in str(w.message))

            self.assertEqual(w.category, RuntimeWarning)

        self.assertRaises(SystemError, check_relative)

        # Check both fail with package set to a non-string

        ns = dict(__package__=object())

        self.assertRaises(ValueError, check_absolute)

        self.assertRaises(ValueError, check_relative)

def test_main(verbose=None):

    run_unittest(ImportTest, PathsTests, RelativeImport)

if __name__ == '__main__':

    # test needs to be a package, so we can do relative import

    from test.test_import import test_main

    test_main()