#!/usr/bin/env python

import os
import sys
import re
import gc
import locale
import shutil
import time
import unittest
import doctest
import operator
import subprocess
import tempfile
import traceback
import warnings

try:
    import platform
    IS_PYPY = platform.python_implementation() == 'PyPy'
    IS_CPYTHON = platform.python_implementation() == 'CPython'
except (ImportError, AttributeError):
    IS_CPYTHON = True
    IS_PYPY = False

try:
    from StringIO import StringIO
except ImportError:
    from io import StringIO

try:
    import cPickle as pickle
except ImportError:
    import pickle

try:
    from io import open as io_open
except ImportError:
    from codecs import open as io_open

try:
    import threading
except ImportError: # No threads, no problems
    threading = None

try:
    from collections import defaultdict
except ImportError:
    class defaultdict(object):
        def __init__(self, default_factory=lambda : None):
            self._dict = {}
            self.default_factory = default_factory
        def __getitem__(self, key):
            if key not in self._dict:
                self._dict[key] = self.default_factory()
            return self._dict[key]
        def __setitem__(self, key, value):
            self._dict[key] = value
        def __contains__(self, key):
            return key in self._dict
        def __repr__(self):
            return repr(self._dict)
        def __nonzero__(self):
            return bool(self._dict)

try:
    basestring
except NameError:
    basestring = str

WITH_CYTHON = True
CY3_DIR = None

from distutils.dist import Distribution
from distutils.core import Extension
from distutils.command.build_ext import build_ext as _build_ext
from distutils import sysconfig
distutils_distro = Distribution()


if sys.platform == 'win32':
    # TODO: Figure out why this hackery (see http://thread.gmane.org/gmane.comp.python.cython.devel/8280/).
    config_files = distutils_distro.find_config_files()
    try: config_files.remove('setup.cfg')
    except ValueError: pass
    distutils_distro.parse_config_files(config_files)

    cfgfiles = distutils_distro.find_config_files()
    try: cfgfiles.remove('setup.cfg')
    except ValueError: pass
    distutils_distro.parse_config_files(cfgfiles)

EXT_DEP_MODULES = {
    'tag:numpy' : 'numpy',
    'tag:pstats': 'pstats',
    'tag:posix' : 'posix',
    'tag:array' : 'array',
}

def patch_inspect_isfunction():
    import inspect
    orig_isfunction = inspect.isfunction
    def isfunction(obj):
        return orig_isfunction(obj) or type(obj).__name__ == 'cython_function_or_method'
    isfunction._orig_isfunction = orig_isfunction
    inspect.isfunction = isfunction

def unpatch_inspect_isfunction():
    import inspect
    try:
        orig_isfunction = inspect.isfunction._orig_isfunction
    except AttributeError:
        pass
    else:
        inspect.isfunction = orig_isfunction

def update_linetrace_extension(ext):
    ext.define_macros.append(('CYTHON_TRACE', 1))
    return ext

def update_numpy_extension(ext):
    import numpy
    from numpy.distutils.misc_util import get_info

    ext.include_dirs.append(numpy.get_include())

    # We need the npymath library for numpy.math.
    # This is typically a static-only library.
    for attr, value in get_info('npymath').items():
        getattr(ext, attr).extend(value)

def update_openmp_extension(ext):
    ext.openmp = True
    language = ext.language

    if language == 'cpp':
        flags = OPENMP_CPP_COMPILER_FLAGS
    else:
        flags = OPENMP_C_COMPILER_FLAGS

    if flags:
        compile_flags, link_flags = flags

        ext.extra_compile_args.extend(compile_flags.split())
        ext.extra_link_args.extend(link_flags.split())
        return ext
    elif sys.platform == 'win32':
        return ext

    return EXCLUDE_EXT

def get_openmp_compiler_flags(language):
    """
    As of gcc 4.2, it supports OpenMP 2.5. Gcc 4.4 implements 3.0. We don't
    (currently) check for other compilers.

    returns a two-tuple of (CFLAGS, LDFLAGS) to build the OpenMP extension
    """
    if language == 'cpp':
        cc = sysconfig.get_config_var('CXX')
    else:
        cc = sysconfig.get_config_var('CC')

    if not cc:
        if sys.platform == 'win32':
            return '/openmp', ''
        return None

    # For some reason, cc can be e.g. 'gcc -pthread'
    cc = cc.split()[0]

    # Force english output
    env = os.environ.copy()
    env['LC_MESSAGES'] = 'C'

    matcher = re.compile(r"gcc version (\d+\.\d+)").search
    try:
        p = subprocess.Popen([cc, "-v"], stderr=subprocess.PIPE, env=env)
    except EnvironmentError:
        # Be compatible with Python 3
        warnings.warn("Unable to find the %s compiler: %s: %s" %
                      (language, os.strerror(sys.exc_info()[1].errno), cc))
        return None
    _, output = p.communicate()

    output = output.decode(locale.getpreferredencoding() or 'ASCII', 'replace')

    gcc_version = matcher(output)
    if not gcc_version:
        return None # not gcc - FIXME: do something about other compilers

    compiler_version = gcc_version.group(1)
    if compiler_version and compiler_version.split('.') >= ['4', '2']:
        return '-fopenmp', '-fopenmp'

try:
    locale.setlocale(locale.LC_ALL, '')
except locale.Error:
    pass

OPENMP_C_COMPILER_FLAGS = get_openmp_compiler_flags('c')
OPENMP_CPP_COMPILER_FLAGS = get_openmp_compiler_flags('cpp')

# Return this from the EXT_EXTRAS matcher callback to exclude the extension
EXCLUDE_EXT = object()

EXT_EXTRAS = {
    'tag:numpy' : update_numpy_extension,
    'tag:openmp': update_openmp_extension,
    'tag:trace' : update_linetrace_extension,
}


def _is_py3_before_32(excluded, version):
    return version[0] >= 3 and version < (3,2)


# TODO: use tags
VER_DEP_MODULES = {
    # tests are excluded if 'CurrentPythonVersion OP VersionTuple', i.e.
    # (2,4) : (operator.lt, ...) excludes ... when PyVer < 2.4.x
    (2,4) : (operator.lt, lambda x: x in ['run.extern_builtins_T258',
                                          'run.builtin_sorted',
                                          'run.reversed_iteration',
                                          ]),
    (2,5) : (operator.lt, lambda x: x in ['run.any',
                                          'run.all',
                                          'run.yield_from_pep380',  # GeneratorExit
                                          'run.generator_frame_cycle', # yield in try-finally
                                          'run.generator_expressions_in_class',
                                          'run.absolute_import',
                                          'run.relativeimport_T542',
                                          'run.relativeimport_star_T542',
                                          'run.initial_file_path',  # relative import
                                          'run.pynumber_subtype_conversion',  # bug in Py2.4
                                          'build.cythonize_script',  # python2.4 -m a.b.c
                                          'build.cythonize_script_excludes',  # python2.4 -m a.b.c
                                          'build.cythonize_script_package',  # python2.4 -m a.b.c
                                          ]),
    (2,6) : (operator.lt, lambda x: x in ['run.print_function',
                                          'run.language_level', # print function
                                          'run.cython3',
                                          'run.property_decorator_T593', # prop.setter etc.
                                          'run.generators_py', # generators, with statement
                                          'run.pure_py', # decorators, with statement
                                          'run.purecdef',
                                          'run.struct_conversion',
                                          'run.bytearray_coercion',
                                          'run.bytearraymethods',
                                          'run.bytearray_ascii_auto_encoding',
                                          'run.bytearray_default_auto_encoding',
                                          # memory views require buffer protocol
                                          'memoryview.relaxed_strides',
                                          'memoryview.cythonarray',
                                          'memoryview.memslice',
                                          'memoryview.numpy_memoryview',
                                          'memoryview.memoryviewattrs',
                                          'memoryview.memoryview',
                                          'run.withstat_py',
                                          ]),
    (2,7) : (operator.lt, lambda x: x in ['run.withstat_py27', # multi context with statement
                                          'run.yield_inside_lambda',
                                          'run.test_dictviews',
                                          'run.pyclass_special_methods',
                                          ]),
    # The next line should start (3,); but this is a dictionary, so
    # we can only have one (3,) key.  Since 2.7 is supposed to be the
    # last 2.x release, things would have to change drastically for this
    # to be unsafe...
    (2,999): (operator.lt, lambda x: x in ['run.special_methods_T561_py3',
                                           'run.test_raisefrom',
                                           ]),
    (3,): (operator.ge, lambda x: x in ['run.non_future_division',
                                        'compile.extsetslice',
                                        'compile.extdelslice',
                                        'run.special_methods_T561_py2'
                                        ]),
    (3,1): (_is_py3_before_32, lambda x: x in ['run.pyclass_special_methods',
                                               ]),
    (3,3) : (operator.lt, lambda x: x in ['build.package_compilation',
                                          ]),
    (3,4,0,'beta',3) : (operator.le, lambda x: x in ['run.py34_signature',
                                          ]),
}

# files that should not be converted to Python 3 code with 2to3
KEEP_2X_FILES = [
    os.path.join('Cython', 'Debugger', 'Tests', 'test_libcython_in_gdb.py'),
    os.path.join('Cython', 'Debugger', 'Tests', 'test_libpython_in_gdb.py'),
    os.path.join('Cython', 'Debugger', 'libcython.py'),
    os.path.join('Cython', 'Debugger', 'libpython.py'),
]

COMPILER = None
INCLUDE_DIRS = [ d for d in os.getenv('INCLUDE', '').split(os.pathsep) if d ]
CFLAGS = os.getenv('CFLAGS', '').split()
CCACHE = os.getenv('CYTHON_RUNTESTS_CCACHE', '').split()
TEST_SUPPORT_DIR = 'testsupport'

BACKENDS = ['c', 'cpp']

UTF8_BOM_BYTES = r'\xef\xbb\xbf'.encode('ISO-8859-1').decode('unicode_escape')


def memoize(f):
    uncomputed = object()
    f._cache = {}
    def func(*args):
        res = f._cache.get(args, uncomputed)
        if res is uncomputed:
            res = f._cache[args] = f(*args)
        return res
    return func


@memoize
def parse_tags(filepath):
    tags = defaultdict(list)
    parse_tag = re.compile(r'#\s*(\w+)\s*:(.*)$').match
    f = io_open(filepath, encoding='ISO-8859-1', errors='ignore')
    try:
        for line in f:
            # ignore BOM-like bytes and whitespace
            line = line.lstrip(UTF8_BOM_BYTES).strip()
            if not line:
                if tags:
                    break  # assume all tags are in one block
                else:
                    continue
            if line[0] != '#':
                break
            parsed = parse_tag(line)
            if parsed:
                tag, values = parsed.groups()
                if tag in ('coding', 'encoding'):
                    continue
                if tag == 'tags':
                    tag = 'tag'
                    print("WARNING: test tags use the 'tag' directive, not 'tags' (%s)" % filepath)
                if tag not in ('mode', 'tag', 'ticket', 'cython', 'distutils'):
                    print("WARNING: unknown test directive '%s' found (%s)" % (tag, filepath))
                values = values.split(',')
                tags[tag].extend(filter(None, [value.strip() for value in values]))
            elif tags:
                break  # assume all tags are in one block
    finally:
        f.close()
    return tags


list_unchanging_dir = memoize(lambda x: os.listdir(x))


@memoize
def _list_pyregr_data_files(test_directory):
    is_data_file = re.compile('(?:[.](txt|pem|db|html)|^bad.*[.]py)$').search
    return ['__init__.py'] + [
        filename for filename in list_unchanging_dir(test_directory)
        if is_data_file(filename)]


def import_ext(module_name, file_path=None):
    if file_path:
        import imp
        return imp.load_dynamic(module_name, file_path)
    else:
        try:
            from importlib import invalidate_caches
        except ImportError:
            pass
        else:
            invalidate_caches()
        return __import__(module_name, globals(), locals(), ['*'])


class build_ext(_build_ext):
    def build_extension(self, ext):
        try:
            try: # Py2.7+ & Py3.2+
                compiler_obj = self.compiler_obj
            except AttributeError:
                compiler_obj = self.compiler
            if ext.language == 'c++':
                compiler_obj.compiler_so.remove('-Wstrict-prototypes')
            if CCACHE:
                compiler_obj.compiler_so = CCACHE + compiler_obj.compiler_so
            if getattr(ext, 'openmp', None) and compiler_obj.compiler_type == 'msvc':
                ext.extra_compile_args.append('/openmp')
        except Exception:
            pass
        _build_ext.build_extension(self, ext)

class ErrorWriter(object):
    match_error = re.compile('(warning:)?(?:.*:)?\s*([-0-9]+)\s*:\s*([-0-9]+)\s*:\s*(.*)').match
    def __init__(self):
        self.output = []
        self.write = self.output.append

    def _collect(self, collect_errors, collect_warnings):
        s = ''.join(self.output)
        result = []
        for line in s.split('\n'):
            match = self.match_error(line)
            if match:
                is_warning, line, column, message = match.groups()
                if (is_warning and collect_warnings) or \
                        (not is_warning and collect_errors):
                    result.append( (int(line), int(column), message.strip()) )
        result.sort()
        return [ "%d:%d: %s" % values for values in result ]

    def geterrors(self):
        return self._collect(True, False)

    def getwarnings(self):
        return self._collect(False, True)

    def getall(self):
        return self._collect(True, True)

class TestBuilder(object):
    def __init__(self, rootdir, workdir, selectors, exclude_selectors, annotate,
                 cleanup_workdir, cleanup_sharedlibs, cleanup_failures,
                 with_pyregr, cython_only, languages, test_bugs, fork, language_level):
        self.rootdir = rootdir
        self.workdir = workdir
        self.selectors = selectors
        self.exclude_selectors = exclude_selectors
        self.annotate = annotate
        self.cleanup_workdir = cleanup_workdir
        self.cleanup_sharedlibs = cleanup_sharedlibs
        self.cleanup_failures = cleanup_failures
        self.with_pyregr = with_pyregr
        self.cython_only = cython_only
        self.languages = languages
        self.test_bugs = test_bugs
        self.fork = fork
        self.language_level = language_level

    def build_suite(self):
        suite = unittest.TestSuite()
        filenames = os.listdir(self.rootdir)
        filenames.sort()
        for filename in filenames:
            path = os.path.join(self.rootdir, filename)
            if os.path.isdir(path) and filename != TEST_SUPPORT_DIR:
                if filename == 'pyregr' and not self.with_pyregr:
                    continue
                if filename == 'broken' and not self.test_bugs:
                    continue
                suite.addTest(
                    self.handle_directory(path, filename))
        if sys.platform not in ['win32']:
            # Non-Windows makefile.
            if [1 for selector in self.selectors if selector("embedded")] \
                and not [1 for selector in self.exclude_selectors if selector("embedded")]:
                suite.addTest(unittest.makeSuite(EmbedTest))
        return suite

    def handle_directory(self, path, context):
        workdir = os.path.join(self.workdir, context)
        if not os.path.exists(workdir):
            os.makedirs(workdir)

        suite = unittest.TestSuite()
        filenames = list_unchanging_dir(path)
        filenames.sort()
        for filename in filenames:
            filepath = os.path.join(path, filename)
            module, ext = os.path.splitext(filename)
            if ext not in ('.py', '.pyx', '.srctree'):
                continue
            if filename.startswith('.'):
                continue # certain emacs backup files
            if context == 'pyregr':
                tags = defaultdict(list)
            else:
                tags = parse_tags(filepath)
            fqmodule = "%s.%s" % (context, module)
            if not [ 1 for match in self.selectors
                     if match(fqmodule, tags) ]:
                continue
            if self.exclude_selectors:
                if [1 for match in self.exclude_selectors 
                        if match(fqmodule, tags)]:
                    continue

            mode = 'run' # default
            if tags['mode']:
                mode = tags['mode'][0]
            elif context == 'pyregr':
                mode = 'pyregr'

            if ext == '.srctree':
                if 'cpp' not in tags['tag'] or 'cpp' in self.languages:
                    suite.addTest(EndToEndTest(filepath, workdir, self.cleanup_workdir))
                continue

            # Choose the test suite.
            if mode == 'pyregr':
                if not filename.startswith('test_'):
                    continue
                test_class = CythonPyregrTestCase
            elif mode == 'run':
                if module.startswith("test_"):
                    test_class = CythonUnitTestCase
                else:
                    test_class = CythonRunTestCase
            else:
                test_class = CythonCompileTestCase

            for test in self.build_tests(test_class, path, workdir,
                                         module, mode == 'error', tags):
                suite.addTest(test)
            if mode == 'run' and ext == '.py' and not self.cython_only:
                # additionally test file in real Python
                suite.addTest(PureDoctestTestCase(module, os.path.join(path, filename)))
                
        return suite

    def build_tests(self, test_class, path, workdir, module, expect_errors, tags):
        if 'werror' in tags['tag']:
            warning_errors = True
        else:
            warning_errors = False

        if expect_errors:
            if 'cpp' in tags['tag'] and 'cpp' in self.languages:
                languages = ['cpp']
            else:
                languages = self.languages[:1]
        else:
            languages = self.languages

        if 'cpp' in tags['tag'] and 'c' in languages:
            languages = list(languages)
            languages.remove('c')
        elif 'no-cpp' in tags['tag'] and 'cpp' in self.languages:
            languages = list(languages)
            languages.remove('cpp')
        tests = [ self.build_test(test_class, path, workdir, module, tags,
                                  language, expect_errors, warning_errors)
                  for language in languages ]
        return tests

    def build_test(self, test_class, path, workdir, module, tags,
                   language, expect_errors, warning_errors):
        language_workdir = os.path.join(workdir, language)
        if not os.path.exists(language_workdir):
            os.makedirs(language_workdir)
        workdir = os.path.join(language_workdir, module)
        return test_class(path, workdir, module, tags,
                          language=language,
                          expect_errors=expect_errors,
                          annotate=self.annotate,
                          cleanup_workdir=self.cleanup_workdir,
                          cleanup_sharedlibs=self.cleanup_sharedlibs,
                          cleanup_failures=self.cleanup_failures,
                          cython_only=self.cython_only,
                          fork=self.fork,
                          language_level=self.language_level,
                          warning_errors=warning_errors)

class CythonCompileTestCase(unittest.TestCase):
    def __init__(self, test_directory, workdir, module, tags, language='c',
                 expect_errors=False, annotate=False, cleanup_workdir=True,
                 cleanup_sharedlibs=True, cleanup_failures=True, cython_only=False,
                 fork=True, language_level=2, warning_errors=False):
        self.test_directory = test_directory
        self.tags = tags
        self.workdir = workdir
        self.module = module
        self.language = language
        self.expect_errors = expect_errors
        self.annotate = annotate
        self.cleanup_workdir = cleanup_workdir
        self.cleanup_sharedlibs = cleanup_sharedlibs
        self.cleanup_failures = cleanup_failures
        self.cython_only = cython_only
        self.fork = fork
        self.language_level = language_level
        self.warning_errors = warning_errors
        unittest.TestCase.__init__(self)

    def shortDescription(self):
        return "compiling (%s) %s" % (self.language, self.module)

    def setUp(self):
        from Cython.Compiler import Options
        self._saved_options = [ (name, getattr(Options, name))
                                for name in ('warning_errors',
                                             'clear_to_none',
                                             'error_on_unknown_names',
                                             'error_on_uninitialized') ]
        self._saved_default_directives = Options.directive_defaults.items()
        Options.warning_errors = self.warning_errors
        if sys.version_info >= (3, 4):
            Options.directive_defaults['autotestdict'] = False

        if not os.path.exists(self.workdir):
            os.makedirs(self.workdir)
        if self.workdir not in sys.path:
            sys.path.insert(0, self.workdir)

    def tearDown(self):
        from Cython.Compiler import Options
        for name, value in self._saved_options:
            setattr(Options, name, value)
        Options.directive_defaults = dict(self._saved_default_directives)
        unpatch_inspect_isfunction()

        try:
            sys.path.remove(self.workdir)
        except ValueError:
            pass
        try:
            del sys.modules[self.module]
        except KeyError:
            pass
        cleanup = self.cleanup_failures or self.success
        cleanup_c_files = WITH_CYTHON and self.cleanup_workdir and cleanup
        cleanup_lib_files = self.cleanup_sharedlibs and cleanup
        if os.path.exists(self.workdir):
            if cleanup_c_files and cleanup_lib_files:
                shutil.rmtree(self.workdir, ignore_errors=True)
            else:
                for rmfile in os.listdir(self.workdir):
                    if not cleanup_c_files:
                        if (rmfile[-2:] in (".c", ".h") or
                                rmfile[-4:] == ".cpp" or
                                rmfile.endswith(".html") and rmfile.startswith(self.module)):
                            continue
                    if not cleanup_lib_files and (rmfile.endswith(".so") or rmfile.endswith(".dll")):
                        continue
                    try:
                        rmfile = os.path.join(self.workdir, rmfile)
                        if os.path.isdir(rmfile):
                            shutil.rmtree(rmfile, ignore_errors=True)
                        else:
                            os.remove(rmfile)
                    except IOError:
                        pass

    def runTest(self):
        self.success = False
        self.runCompileTest()
        self.success = True

    def runCompileTest(self):
        return self.compile(
            self.test_directory, self.module, self.workdir,
            self.test_directory, self.expect_errors, self.annotate)

    def find_module_source_file(self, source_file):
        if not os.path.exists(source_file):
            source_file = source_file[:-1]
        return source_file

    def build_target_filename(self, module_name):
        target = '%s.%s' % (module_name, self.language)
        return target

    def related_files(self, test_directory, module_name):
        is_related = re.compile('%s_.*[.].*' % module_name).match
        return [filename for filename in list_unchanging_dir(test_directory)
                if is_related(filename)]

    def copy_files(self, test_directory, target_directory, file_list):
        # use symlink on Unix, copy on Windows
        try:
            copy = os.symlink
        except AttributeError:
            copy = shutil.copy

        join = os.path.join
        for filename in file_list:
            file_path = join(test_directory, filename)
            if os.path.exists(file_path):
                copy(file_path, join(target_directory, filename))

    def source_files(self, workdir, module_name, file_list):
        return ([self.build_target_filename(module_name)] +
            [filename for filename in file_list
             if not os.path.isfile(os.path.join(workdir, filename))])

    def split_source_and_output(self, test_directory, module, workdir):
        source_file = self.find_module_source_file(os.path.join(test_directory, module) + '.pyx')
        source_and_output = io_open(source_file, 'rU', encoding='ISO-8859-1')
        try:
            out = io_open(os.path.join(workdir, module + os.path.splitext(source_file)[1]),
                              'w', encoding='ISO-8859-1')
            for line in source_and_output:
                if line.startswith("_ERRORS"):
                    out.close()
                    out = ErrorWriter()
                else:
                    out.write(line)
        finally:
            source_and_output.close()
        try:
            geterrors = out.geterrors
        except AttributeError:
            out.close()
            return []
        else:
            return geterrors()

    def run_cython(self, test_directory, module, targetdir, incdir, annotate,
                   extra_compile_options=None):
        include_dirs = INCLUDE_DIRS + [os.path.join(test_directory, '..', TEST_SUPPORT_DIR)]
        if incdir:
            include_dirs.append(incdir)
        source = self.find_module_source_file(
            os.path.join(test_directory, module + '.pyx'))
        target = os.path.join(targetdir, self.build_target_filename(module))

        if extra_compile_options is None:
            extra_compile_options = {}

        try:
            CompilationOptions
        except NameError:
            from Cython.Compiler.Main import CompilationOptions
            from Cython.Compiler.Main import compile as cython_compile
            from Cython.Compiler.Main import default_options

        options = CompilationOptions(
            default_options,
            include_path = include_dirs,
            output_file = target,
            annotate = annotate,
            use_listing_file = False,
            cplus = self.language == 'cpp',
            language_level = self.language_level,
            generate_pxi = False,
            evaluate_tree_assertions = True,
            **extra_compile_options
            )
        cython_compile(source, options=options,
                       full_module_name=module)

    def run_distutils(self, test_directory, module, workdir, incdir,
                      extra_extension_args=None):
        cwd = os.getcwd()
        os.chdir(workdir)
        try:
            build_extension = build_ext(distutils_distro)
            build_extension.include_dirs = INCLUDE_DIRS[:]
            if incdir:
                build_extension.include_dirs.append(incdir)
            build_extension.finalize_options()
            if COMPILER:
                build_extension.compiler = COMPILER

            ext_compile_flags = CFLAGS[:]
            compiler = COMPILER or sysconfig.get_config_var('CC')

            if self.language == 'c' and compiler == 'gcc':
                ext_compile_flags.extend(['-std=c89', '-pedantic'])
            if  build_extension.compiler == 'mingw32':
                ext_compile_flags.append('-Wno-format')
            if extra_extension_args is None:
                extra_extension_args = {}

            related_files = self.related_files(test_directory, module)
            self.copy_files(test_directory, workdir, related_files)
            extension = Extension(
                module,
                sources = self.source_files(workdir, module, related_files),
                extra_compile_args = ext_compile_flags,
                **extra_extension_args
                )

            if self.language == 'cpp':
                # Set the language now as the fixer might need it
                extension.language = 'c++'

            if 'distutils' in self.tags:
                from Cython.Build.Dependencies import DistutilsInfo
                pyx_path = os.path.join(self.test_directory, self.module + ".pyx")
                DistutilsInfo(open(pyx_path)).apply(extension)

            for matcher, fixer in list(EXT_EXTRAS.items()):
                if isinstance(matcher, str):
                    # lazy init
                    del EXT_EXTRAS[matcher]
                    matcher = string_selector(matcher)
                    EXT_EXTRAS[matcher] = fixer
                if matcher(module, self.tags):
                    newext = fixer(extension)
                    if newext is EXCLUDE_EXT:
                        return
                    extension = newext or extension
            if self.language == 'cpp':
                extension.language = 'c++'
            build_extension.extensions = [extension]
            build_extension.build_temp = workdir
            build_extension.build_lib  = workdir
            build_extension.run()
        finally:
            os.chdir(cwd)

        try:
            get_ext_fullpath = build_extension.get_ext_fullpath
        except AttributeError:
            def get_ext_fullpath(ext_name, self=build_extension):
                # copied from distutils.command.build_ext (missing in Py2.[45])
                fullname = self.get_ext_fullname(ext_name)
                modpath = fullname.split('.')
                filename = self.get_ext_filename(modpath[-1])
                if not self.inplace:
                    filename = os.path.join(*modpath[:-1]+[filename])
                    return os.path.join(self.build_lib, filename)
                package = '.'.join(modpath[0:-1])
                build_py = self.get_finalized_command('build_py')
                package_dir = os.path.abspath(build_py.get_package_dir(package))
                return os.path.join(package_dir, filename)

        return get_ext_fullpath(module)

    def compile(self, test_directory, module, workdir, incdir,
                expect_errors, annotate):
        expected_errors = errors = ()
        if expect_errors:
            expected_errors = self.split_source_and_output(
                test_directory, module, workdir)
            test_directory = workdir

        if WITH_CYTHON:
            old_stderr = sys.stderr
            try:
                sys.stderr = ErrorWriter()
                self.run_cython(test_directory, module, workdir, incdir, annotate)
                errors = sys.stderr.geterrors()
            finally:
                sys.stderr = old_stderr

        if errors or expected_errors:
            try:
                for expected, error in zip(expected_errors, errors):
                    self.assertEquals(expected, error)
                if len(errors) < len(expected_errors):
                    expected_error = expected_errors[len(errors)]
                    self.assertEquals(expected_error, None)
                elif len(errors) > len(expected_errors):
                    unexpected_error = errors[len(expected_errors)]
                    self.assertEquals(None, unexpected_error)
            except AssertionError:
                print("\n=== Expected errors: ===")
                print('\n'.join(expected_errors))
                print("\n\n=== Got errors: ===")
                print('\n'.join(errors))
                print('\n')
                raise
            return None

        if self.cython_only:
            so_path = None
        else:
            so_path = self.run_distutils(test_directory, module, workdir, incdir)
        return so_path

class CythonRunTestCase(CythonCompileTestCase):
    def setUp(self):
        CythonCompileTestCase.setUp(self)
        from Cython.Compiler import Options
        Options.clear_to_none = False

    def shortDescription(self):
        if self.cython_only:
            return CythonCompileTestCase.shortDescription(self)
        else:
            return "compiling (%s) and running %s" % (self.language, self.module)

    def run(self, result=None):
        if result is None:
            result = self.defaultTestResult()
        result.startTest(self)
        try:
            self.setUp()
            try:
                self.success = False
                ext_so_path = self.runCompileTest()
                failures, errors = len(result.failures), len(result.errors)
                if not self.cython_only:
                    self.run_tests(result, ext_so_path)
                if failures == len(result.failures) and errors == len(result.errors):
                    # No new errors...
                    self.success = True
            finally:
                check_thread_termination()
        except Exception:
            result.addError(self, sys.exc_info())
            result.stopTest(self)
        try:
            self.tearDown()
        except Exception:
            pass

    def run_tests(self, result, ext_so_path):
        self.run_doctests(self.module, result, ext_so_path)

    def run_doctests(self, module_or_name, result, ext_so_path):
        def run_test(result):
            if isinstance(module_or_name, basestring):
                module = import_ext(module_or_name, ext_so_path)
            else:
                module = module_or_name
            tests = doctest.DocTestSuite(module)
            tests.run(result)
        run_forked_test(result, run_test, self.shortDescription(), self.fork)

def run_forked_test(result, run_func, test_name, fork=True):
    if not fork or sys.version_info[0] >= 3 or not hasattr(os, 'fork'):
        run_func(result)
        sys.stdout.flush()
        sys.stderr.flush()
        gc.collect()
        return

    # fork to make sure we do not keep the tested module loaded
    result_handle, result_file = tempfile.mkstemp()
    os.close(result_handle)
    child_id = os.fork()
    if not child_id:
        result_code = 0
        output = None
        try:
            try:
                tests = partial_result = None
                try:
                    partial_result = PartialTestResult(result)
                    run_func(partial_result)
                    sys.stdout.flush()
                    sys.stderr.flush()
                    gc.collect()
                except Exception:
                    result_code = 1
                    if partial_result is not None:
                        if tests is None:
                            # importing failed, try to fake a test class
                            tests = _FakeClass(
                                failureException=sys.exc_info()[1],
                                _shortDescription=test_name,
                                module_name=None)
                        partial_result.addError(tests, sys.exc_info())
                output = open(result_file, 'wb')
                pickle.dump(partial_result.data(), output)
            except:
                traceback.print_exc()
        finally:
            try: sys.stderr.flush()
            except: pass
            try: sys.stdout.flush()
            except: pass
            try:
                if output is not None:
                    output.close()
            except:
                pass
            os._exit(result_code)

    try:
        cid, result_code = os.waitpid(child_id, 0)
        module_name = test_name.split()[-1]
        # os.waitpid returns the child's result code in the
        # upper byte of result_code, and the signal it was
        # killed by in the lower byte
        if result_code & 255:
            raise Exception("Tests in module '%s' were unexpectedly killed by signal %d"%
                            (module_name, result_code & 255))
        result_code >>= 8
        if result_code in (0,1):
            input = open(result_file, 'rb')
            try:
                PartialTestResult.join_results(result, pickle.load(input))
            finally:
                input.close()
        if result_code:
            raise Exception("Tests in module '%s' exited with status %d" %
                            (module_name, result_code))
    finally:
        try: os.unlink(result_file)
        except: pass

class PureDoctestTestCase(unittest.TestCase):
    def __init__(self, module_name, module_path):
        self.module_name = module_name
        self.module_path = module_path
        unittest.TestCase.__init__(self, 'run')

    def shortDescription(self):
        return "running pure doctests in %s" % self.module_name

    def run(self, result=None):
        if result is None:
            result = self.defaultTestResult()
        loaded_module_name = 'pure_doctest__' + self.module_name
        result.startTest(self)
        try:
            self.setUp()

            import imp
            m = imp.load_source(loaded_module_name, self.module_path)
            try:
                doctest.DocTestSuite(m).run(result)
            finally:
                del m
                if loaded_module_name in sys.modules:
                    del sys.modules[loaded_module_name]
                check_thread_termination()
        except Exception:
            result.addError(self, sys.exc_info())
            result.stopTest(self)
        try:
            self.tearDown()
        except Exception:
            pass

is_private_field = re.compile('^_[^_]').match

class _FakeClass(object):
    def __init__(self, **kwargs):
        self._shortDescription = kwargs.get('module_name')
        self.__dict__.update(kwargs)
    def shortDescription(self):
        return self._shortDescription

try: # Py2.7+ and Py3.2+
    from unittest.runner import _TextTestResult
except ImportError:
    from unittest import _TextTestResult

class PartialTestResult(_TextTestResult):
    def __init__(self, base_result):
        _TextTestResult.__init__(
            self, self._StringIO(), True,
            base_result.dots + base_result.showAll*2)

    def strip_error_results(self, results):
        for test_case, error in results:
            for attr_name in filter(is_private_field, dir(test_case)):
                if attr_name == '_dt_test':
                    test_case._dt_test = _FakeClass(
                        name=test_case._dt_test.name)
                elif attr_name != '_shortDescription':
                    setattr(test_case, attr_name, None)

    def data(self):
        self.strip_error_results(self.failures)
        self.strip_error_results(self.errors)
        return (self.failures, self.errors, self.testsRun,
                self.stream.getvalue())

    def join_results(result, data):
        """Static method for merging the result back into the main
        result object.
        """
        failures, errors, tests_run, output = data
        if output:
            result.stream.write(output)
        result.errors.extend(errors)
        result.failures.extend(failures)
        result.testsRun += tests_run

    join_results = staticmethod(join_results)

    class _StringIO(StringIO):
        def writeln(self, line):
            self.write("%s\n" % line)


class CythonUnitTestCase(CythonRunTestCase):
    def shortDescription(self):
        return "compiling (%s) tests in %s" % (self.language, self.module)

    def run_tests(self, result, ext_so_path):
        module = import_ext(self.module, ext_so_path)
        unittest.defaultTestLoader.loadTestsFromModule(module).run(result)


class CythonPyregrTestCase(CythonRunTestCase):
    def setUp(self):
        CythonRunTestCase.setUp(self)
        from Cython.Compiler import Options
        Options.error_on_unknown_names = False
        Options.error_on_uninitialized = False
        Options.directive_defaults.update(dict(
            binding=True, always_allow_keywords=True,
            set_initial_path="SOURCEFILE"))
        patch_inspect_isfunction()

    def related_files(self, test_directory, module_name):
        return _list_pyregr_data_files(test_directory)

    def _run_unittest(self, result, *classes):
        """Run tests from unittest.TestCase-derived classes."""
        valid_types = (unittest.TestSuite, unittest.TestCase)
        suite = unittest.TestSuite()
        for cls in classes:
            if isinstance(cls, str):
                if cls in sys.modules:
                    suite.addTest(unittest.findTestCases(sys.modules[cls]))
                else:
                    raise ValueError("str arguments must be keys in sys.modules")
            elif isinstance(cls, valid_types):
                suite.addTest(cls)
            else:
                suite.addTest(unittest.makeSuite(cls))
        suite.run(result)

    def _run_doctest(self, result, module):
        self.run_doctests(module, result, None)

    def run_tests(self, result, ext_so_path):
        try:
            from test import support
        except ImportError: # Python2.x
            from test import test_support as support

        def run_test(result):
            def run_unittest(*classes):
                return self._run_unittest(result, *classes)
            def run_doctest(module, verbosity=None):
                return self._run_doctest(result, module)

            backup = (support.run_unittest, support.run_doctest)
            support.run_unittest = run_unittest
            support.run_doctest = run_doctest

            try:
                try:
                    sys.stdout.flush() # helps in case of crashes
                    module = import_ext(self.module, ext_so_path)
                    sys.stdout.flush() # helps in case of crashes
                    if hasattr(module, 'test_main'):
                        module.test_main()
                        sys.stdout.flush() # helps in case of crashes
                except (unittest.SkipTest, support.ResourceDenied):
                    result.addSkip(self, 'ok')
            finally:
                support.run_unittest, support.run_doctest = backup

        run_forked_test(result, run_test, self.shortDescription(), self.fork)

include_debugger = IS_CPYTHON and sys.version_info[:2] > (2, 5)

def collect_unittests(path, module_prefix, suite, selectors, exclude_selectors):
    def file_matches(filename):
        return filename.startswith("Test") and filename.endswith(".py")

    def package_matches(dirname):
        return dirname == "Tests"

    loader = unittest.TestLoader()

    if include_debugger:
        skipped_dirs = []
    else:
        skipped_dirs = ['Cython' + os.path.sep + 'Debugger' + os.path.sep]

    for dirpath, dirnames, filenames in os.walk(path):
        if dirpath != path and "__init__.py" not in filenames:
            skipped_dirs.append(dirpath + os.path.sep)
            continue
        skip = False
        for dir in skipped_dirs:
            if dirpath.startswith(dir):
                skip = True
        if skip:
            continue
        parentname = os.path.split(dirpath)[-1]
        if package_matches(parentname):
            for f in filenames:
                if file_matches(f):
                    filepath = os.path.join(dirpath, f)[:-len(".py")]
                    modulename = module_prefix + filepath[len(path)+1:].replace(os.path.sep, '.')
                    if not [ 1 for match in selectors if match(modulename) ]:
                        continue
                    if [ 1 for match in exclude_selectors if match(modulename) ]:
                        continue
                    module = __import__(modulename)
                    for x in modulename.split('.')[1:]:
                        module = getattr(module, x)
                    suite.addTests([loader.loadTestsFromModule(module)])


def collect_doctests(path, module_prefix, suite, selectors, exclude_selectors):
    def package_matches(dirname):
        if dirname == 'Debugger' and not include_debugger:
            return False
        return dirname not in ("Mac", "Distutils", "Plex")
    def file_matches(filename):
        filename, ext = os.path.splitext(filename)
        blacklist = ['libcython', 'libpython', 'test_libcython_in_gdb',
                     'TestLibCython']
        return (ext == '.py' and not
                '~' in filename and not
                '#' in filename and not
                filename.startswith('.') and not
                filename in blacklist)
    import doctest
    for dirpath, dirnames, filenames in os.walk(path):
        for dir in list(dirnames):
            if not package_matches(dir):
                dirnames.remove(dir)
        for f in filenames:
            if file_matches(f):
                if not f.endswith('.py'): continue
                filepath = os.path.join(dirpath, f)
                if os.path.getsize(filepath) == 0: continue
                filepath = filepath[:-len(".py")]
                modulename = module_prefix + filepath[len(path)+1:].replace(os.path.sep, '.')
                if not [ 1 for match in selectors if match(modulename) ]:
                    continue
                if [ 1 for match in exclude_selectors if match(modulename) ]:
                    continue
                if 'in_gdb' in modulename:
                    # These should only be imported from gdb.
                    continue
                module = __import__(modulename)
                for x in modulename.split('.')[1:]:
                    module = getattr(module, x)
                if hasattr(module, "__doc__") or hasattr(module, "__test__"):
                    try:
                        suite.addTest(doctest.DocTestSuite(module))
                    except ValueError: # no tests
                        pass


class EndToEndTest(unittest.TestCase):
    """
    This is a test of build/*.srctree files, where srctree defines a full
    directory structure and its header gives a list of commands to run.
    """
    cython_root = os.path.dirname(os.path.abspath(__file__))

    def __init__(self, treefile, workdir, cleanup_workdir=True):
        self.name = os.path.splitext(os.path.basename(treefile))[0]
        self.treefile = treefile
        self.workdir = os.path.join(workdir, self.name)
        self.cleanup_workdir = cleanup_workdir
        cython_syspath = [self.cython_root]
        for path in sys.path:
            if path.startswith(self.cython_root) and path not in cython_syspath:
                # Py3 installation and refnanny build prepend their
                # fixed paths to sys.path => prefer that over the
                # generic one (cython_root itself goes last)
                cython_syspath.append(path)
        self.cython_syspath = os.pathsep.join(cython_syspath[::-1])
        unittest.TestCase.__init__(self)

    def shortDescription(self):
        return "End-to-end %s" % self.name

    def setUp(self):
        from Cython.TestUtils import unpack_source_tree
        _, self.commands = unpack_source_tree(self.treefile, self.workdir)
        self.old_dir = os.getcwd()
        os.chdir(self.workdir)
        if self.workdir not in sys.path:
            sys.path.insert(0, self.workdir)

    def tearDown(self):
        if self.cleanup_workdir:
            for trial in range(5):
                try:
                    shutil.rmtree(self.workdir)
                except OSError:
                    time.sleep(0.1)
                else:
                    break
        os.chdir(self.old_dir)

    def _try_decode(self, content):
        try:
            return content.decode()
        except UnicodeDecodeError:
            return content.decode('iso-8859-1')

    def runTest(self):
        self.success = False
        commands = (self.commands
            .replace("CYTHON", "PYTHON %s" % os.path.join(self.cython_root, 'cython.py'))
            .replace("PYTHON", sys.executable))
        old_path = os.environ.get('PYTHONPATH')
        os.environ['PYTHONPATH'] = self.cython_syspath + os.pathsep + (old_path or '')
        try:
            for command in filter(None, commands.splitlines()):
                p = subprocess.Popen(command,
                                     stderr=subprocess.PIPE,
                                     stdout=subprocess.PIPE,
                                     shell=True)
                out, err = p.communicate()
                res = p.returncode
                if res != 0:
                    print(command)
                    print(self._try_decode(out))
                    print(self._try_decode(err))
                self.assertEqual(0, res, "non-zero exit status")
        finally:
            if old_path:
                os.environ['PYTHONPATH'] = old_path
            else:
                del os.environ['PYTHONPATH']
        self.success = True


# TODO: Support cython_freeze needed here as well.
# TODO: Windows support.

class EmbedTest(unittest.TestCase):

    working_dir = "Demos/embed"

    def setUp(self):
        self.old_dir = os.getcwd()
        os.chdir(self.working_dir)
        os.system(
            "make PYTHON='%s' clean > /dev/null" % sys.executable)

    def tearDown(self):
        try:
            os.system(
                "make PYTHON='%s' clean > /dev/null" % sys.executable)
        except:
            pass
        os.chdir(self.old_dir)

    def test_embed(self):
        from distutils import sysconfig
        libname = sysconfig.get_config_var('LIBRARY')
        libdir = sysconfig.get_config_var('LIBDIR')
        if not os.path.isdir(libdir) or libname not in os.listdir(libdir):
            libdir = os.path.join(os.path.dirname(sys.executable), '..', 'lib')
            if not os.path.isdir(libdir) or libname not in os.listdir(libdir):
                libdir = os.path.join(libdir, 'python%d.%d' % sys.version_info[:2], 'config')
                if not os.path.isdir(libdir) or libname not in os.listdir(libdir):
                    # report the error for the original directory
                    libdir = sysconfig.get_config_var('LIBDIR')
        cython = 'cython.py'
        if sys.version_info[0] >=3 and CY3_DIR:
            cython = os.path.join(CY3_DIR, cython)
        cython = os.path.abspath(os.path.join('..', '..', cython))
        self.assert_(os.system(
            "make PYTHON='%s' CYTHON='%s' LIBDIR1='%s' test > make.output" % (sys.executable, cython, libdir)) == 0)
        try:
            os.remove('make.output')
        except OSError:
            pass

class MissingDependencyExcluder:
    def __init__(self, deps):
        # deps: { matcher func : module name }
        self.exclude_matchers = []
        for matcher, mod in deps.items():
            try:
                __import__(mod)
            except ImportError:
                self.exclude_matchers.append(string_selector(matcher))
        self.tests_missing_deps = []
    def __call__(self, testname, tags=None):
        for matcher in self.exclude_matchers:
            if matcher(testname, tags):
                self.tests_missing_deps.append(testname)
                return True
        return False

class VersionDependencyExcluder:
    def __init__(self, deps):
        # deps: { version : matcher func }
        from sys import version_info
        self.exclude_matchers = []
        for ver, (compare, matcher) in deps.items():
            if compare(version_info, ver):
                self.exclude_matchers.append(matcher)
        self.tests_missing_deps = []
    def __call__(self, testname, tags=None):
        for matcher in self.exclude_matchers:
            if matcher(testname):
                self.tests_missing_deps.append(testname)
                return True
        return False

class FileListExcluder:

    def __init__(self, list_file):
        self.excludes = {}
        f = open(list_file)
        try:
            for line in f.readlines():
                line = line.strip()
                if line and line[0] != '#':
                    self.excludes[line.split()[0]] = True
        finally:
            f.close()

    def __call__(self, testname, tags=None):
        return testname in self.excludes or testname.split('.')[-1] in self.excludes

class TagsSelector:

    def __init__(self, tag, value):
        self.tag = tag
        self.value = value
    
    def __call__(self, testname, tags=None):
        if tags is None:
            return False
        else:
            return self.value in tags[self.tag]

class RegExSelector:
    
    def __init__(self, pattern_string):
        try:
            self.pattern = re.compile(pattern_string, re.I|re.U)
        except re.error:
            print('Invalid pattern: %r' % pattern_string)
            raise

    def __call__(self, testname, tags=None):
        return self.pattern.search(testname)

def string_selector(s):
    ix = s.find(':')
    if ix == -1:
        return RegExSelector(s)
    else:
        return TagsSelector(s[:ix], s[ix+1:])

class ShardExcludeSelector:
    # This is an exclude selector so it can override the (include) selectors.
    # It may not provide uniform distribution (in time or count), but is a
    # determanistic partition of the tests which is important.
    def __init__(self, shard_num, shard_count):
        self.shard_num = shard_num
        self.shard_count = shard_count

    def __call__(self, testname, tags=None):
        return abs(hash(testname)) % self.shard_count != self.shard_num
        

def refactor_for_py3(distdir, cy3_dir):
    # need to convert Cython sources first
    import lib2to3.refactor
    from distutils.util import copydir_run_2to3
    fixers = [ fix for fix in lib2to3.refactor.get_fixers_from_package("lib2to3.fixes")
               if fix.split('fix_')[-1] not in ('next',)
               ]
    if not os.path.exists(cy3_dir):
        os.makedirs(cy3_dir)
    import distutils.log as dlog
    dlog.set_threshold(dlog.INFO)
    copydir_run_2to3(distdir, cy3_dir, fixer_names=fixers,
                     template = '''
                     global-exclude *
                     graft Cython
                     recursive-exclude Cython *
                     recursive-include Cython *.py *.pyx *.pxd
                     recursive-include Cython/Debugger/Tests *
                     recursive-include Cython/Utility *
                     recursive-exclude pyximport test
                     include pyximport/*.py
                     include runtests.py
                     include cython.py
                     ''')
    sys.path.insert(0, cy3_dir)

    for keep_2x_file in KEEP_2X_FILES:
        destfile = os.path.join(cy3_dir, keep_2x_file)
        shutil.copy(keep_2x_file, destfile)

class PendingThreadsError(RuntimeError):
    pass

threads_seen = []

def check_thread_termination(ignore_seen=True):
    if threading is None: # no threading enabled in CPython
        return
    current = threading.currentThread()
    blocking_threads = []
    for t in threading.enumerate():
        if not t.isAlive() or t == current:
            continue
        t.join(timeout=2)
        if t.isAlive():
            if not ignore_seen:
                blocking_threads.append(t)
                continue
            for seen in threads_seen:
                if t is seen:
                    break
            else:
                threads_seen.append(t)
                blocking_threads.append(t)
    if not blocking_threads:
        return
    sys.stderr.write("warning: left-over threads found after running test:\n")
    for t in blocking_threads:
        sys.stderr.write('...%s\n'  % repr(t))
    raise PendingThreadsError("left-over threads found after running test")

def subprocess_output(cmd):
    try:
        p = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
        return p.communicate()[0].decode('UTF-8')
    except OSError:
        return ''

def get_version():
    from Cython.Compiler.Version import version as cython_version
    full_version = cython_version
    top = os.path.dirname(os.path.abspath(__file__))
    if os.path.exists(os.path.join(top, '.git')):
        old_dir = os.getcwd()
        try:
            os.chdir(top)
            head_commit = subprocess_output(['git', 'rev-parse', 'HEAD']).strip()
            version_commit = subprocess_output(['git', 'rev-parse', cython_version]).strip()
            diff = subprocess_output(['git', 'diff', '--stat']).strip()
            if head_commit != version_commit:
                full_version += " " + head_commit
            if diff:
                full_version += ' + uncommitted changes'
        finally:
            os.chdir(old_dir)
    return full_version

_orig_stdout, _orig_stderr = sys.stdout, sys.stderr
def flush_and_terminate(status):
    try:
        _orig_stdout.flush()
        _orig_stderr.flush()
    finally:
        os._exit(status)

def main():

    global DISTDIR, WITH_CYTHON
    DISTDIR = os.path.join(os.getcwd(), os.path.dirname(sys.argv[0]))

    from optparse import OptionParser
    parser = OptionParser()
    parser.add_option("--no-cleanup", dest="cleanup_workdir",
                      action="store_false", default=True,
                      help="do not delete the generated C files (allows passing --no-cython on next run)")
    parser.add_option("--no-cleanup-sharedlibs", dest="cleanup_sharedlibs",
                      action="store_false", default=True,
                      help="do not delete the generated shared libary files (allows manual module experimentation)")
    parser.add_option("--no-cleanup-failures", dest="cleanup_failures",
                      action="store_false", default=True,
                      help="enable --no-cleanup and --no-cleanup-sharedlibs for failed tests only")
    parser.add_option("--no-cython", dest="with_cython",
                      action="store_false", default=True,
                      help="do not run the Cython compiler, only the C compiler")
    parser.add_option("--compiler", dest="compiler", default=None,
                      help="C compiler type")
    backend_list = ','.join(BACKENDS)
    parser.add_option("--backends", dest="backends", default=backend_list,
                      help="select backends to test (default: %s)" % backend_list)
    parser.add_option("--no-c", dest="use_c",
                      action="store_false", default=True,
                      help="do not test C compilation backend")
    parser.add_option("--no-cpp", dest="use_cpp",
                      action="store_false", default=True,
                      help="do not test C++ compilation backend")
    parser.add_option("--no-unit", dest="unittests",
                      action="store_false", default=True,
                      help="do not run the unit tests")
    parser.add_option("--no-doctest", dest="doctests",
                      action="store_false", default=True,
                      help="do not run the doctests")
    parser.add_option("--no-file", dest="filetests",
                      action="store_false", default=True,
                      help="do not run the file based tests")
    parser.add_option("--no-pyregr", dest="pyregr",
                      action="store_false", default=True,
                      help="do not run the regression tests of CPython in tests/pyregr/")
    parser.add_option("--cython-only", dest="cython_only",
                      action="store_true", default=False,
                      help="only compile pyx to c, do not run C compiler or run the tests")
    parser.add_option("--no-refnanny", dest="with_refnanny",
                      action="store_false", default=True,
                      help="do not regression test reference counting")
    parser.add_option("--no-fork", dest="fork",
                      action="store_false", default=True,
                      help="do not fork to run tests")
    parser.add_option("--sys-pyregr", dest="system_pyregr",
                      action="store_true", default=False,
                      help="run the regression tests of the CPython installation")
    parser.add_option("-x", "--exclude", dest="exclude",
                      action="append", metavar="PATTERN",
                      help="exclude tests matching the PATTERN")
    parser.add_option("--shard_count", dest="shard_count", metavar="N",
                      type=int, default=1,
                      help="shard this run into several parallel runs")
    parser.add_option("--shard_num", dest="shard_num", metavar="K",
                      type=int, default=-1,
                      help="test only this single shard")
    parser.add_option("-C", "--coverage", dest="coverage",
                      action="store_true", default=False,
                      help="collect source coverage data for the Compiler")
    parser.add_option("--coverage-xml", dest="coverage_xml",
                      action="store_true", default=False,
                      help="collect source coverage data for the Compiler in XML format")
    parser.add_option("--coverage-html", dest="coverage_html",
                      action="store_true", default=False,
                      help="collect source coverage data for the Compiler in HTML format")
    parser.add_option("-A", "--annotate", dest="annotate_source",
                      action="store_true", default=True,
                      help="generate annotated HTML versions of the test source files")
    parser.add_option("--no-annotate", dest="annotate_source",
                      action="store_false",
                      help="do not generate annotated HTML versions of the test source files")
    parser.add_option("-v", "--verbose", dest="verbosity",
                      action="count", default=0,
                      help="display test progress, pass twice to print test names")
    parser.add_option("-T", "--ticket", dest="tickets",
                      action="append",
                      help="a bug ticket number to run the respective test in 'tests/*'")
    parser.add_option("-3", dest="language_level",
                      action="store_const", const=3, default=2,
                      help="set language level to Python 3 (useful for running the CPython regression tests)'")
    parser.add_option("--xml-output", dest="xml_output_dir", metavar="DIR",
                      help="write test results in XML to directory DIR")
    parser.add_option("--exit-ok", dest="exit_ok", default=False,
                      action="store_true",
                      help="exit without error code even on test failures")
    parser.add_option("--root-dir", dest="root_dir", default=os.path.join(DISTDIR, 'tests'),
                      help="working directory")
    parser.add_option("--work-dir", dest="work_dir", default=os.path.join(os.getcwd(), 'BUILD'),
                      help="working directory")
    parser.add_option("--cython-dir", dest="cython_dir", default=os.getcwd(),
                      help="Cython installation directory (default: use local source version)")
    parser.add_option("--debug", dest="for_debugging", default=False, action="store_true",
                      help="configure for easier use with a debugger (e.g. gdb)")
    parser.add_option("--pyximport-py", dest="pyximport_py", default=False, action="store_true",
                      help="use pyximport to automatically compile imported .pyx and .py files")
    parser.add_option("--watermark", dest="watermark", default=None,
                      help="deterministic generated by string")

    options, cmd_args = parser.parse_args()

    WORKDIR = os.path.abspath(options.work_dir)
    
    if sys.version_info[0] >= 3:
        options.doctests = False
        if options.with_cython:
            sys.path.insert(0, options.cython_dir)
            try:
                # try if Cython is installed in a Py3 version
                import Cython.Compiler.Main
            except Exception:
                # back out anything the import process loaded, then
                # 2to3 the Cython sources to make them re-importable
                cy_modules = [ name for name in sys.modules
                               if name == 'Cython' or name.startswith('Cython.') ]
                for name in cy_modules:
                    del sys.modules[name]
                # hasn't been refactored yet - do it now
                global CY3_DIR
                CY3_DIR = cy3_dir = os.path.join(WORKDIR, 'Cy3')
                if sys.version_info >= (3,1):
                    refactor_for_py3(DISTDIR, cy3_dir)
                elif os.path.isdir(cy3_dir):
                    sys.path.insert(0, cy3_dir)
                else:
                    options.with_cython = False

    if options.watermark:
        import Cython.Compiler.Version
        Cython.Compiler.Version.watermark = options.watermark

    WITH_CYTHON = options.with_cython

    coverage = None
    if options.coverage or options.coverage_xml or options.coverage_html:
        if options.shard_count <= 1 and options.shard_num < 0:
            if not WITH_CYTHON:
                options.coverage = options.coverage_xml = options.coverage_html = False
            else:
                print("Enabling coverage analysis")
                from coverage import coverage as _coverage
                coverage = _coverage(branch=True, omit=['Test*'])
                coverage.erase()
                coverage.start()

    if WITH_CYTHON:
        global CompilationOptions, pyrex_default_options, cython_compile
        from Cython.Compiler.Main import \
            CompilationOptions, \
            default_options as pyrex_default_options, \
            compile as cython_compile
        from Cython.Compiler import Errors
        Errors.LEVEL = 0 # show all warnings
        from Cython.Compiler import Options
        Options.generate_cleanup_code = 3   # complete cleanup code
        from Cython.Compiler import DebugFlags
        DebugFlags.debug_temp_code_comments = 1

    if options.shard_count > 1 and options.shard_num == -1:
        import multiprocessing
        pool = multiprocessing.Pool(options.shard_count)
        tasks = [(options, cmd_args, shard_num) for shard_num in range(options.shard_count)]
        errors = []
        for shard_num, return_code in pool.imap_unordered(runtests_callback, tasks):
            if return_code != 0:
                errors.append(shard_num)
                print("FAILED (%s/%s)" % (shard_num, options.shard_count))
            print("ALL DONE (%s/%s)" % (shard_num, options.shard_count))
        pool.close()
        pool.join()
        if errors:
            print("Errors for shards %s" % ", ".join([str(e) for e in errors]))
            return_code = 1
        else:
            return_code = 0
    else:
        _, return_code = runtests(options, cmd_args, coverage)
    print("ALL DONE")

    try:
        check_thread_termination(ignore_seen=False)
    except PendingThreadsError:
        # normal program exit won't kill the threads, do it the hard way here
        flush_and_terminate(return_code)
    else:
        sys.exit(return_code)


def runtests_callback(args):
    options, cmd_args, shard_num = args
    options.shard_num = shard_num
    return runtests(options, cmd_args)

def runtests(options, cmd_args, coverage=None):

    WITH_CYTHON = options.with_cython
    ROOTDIR = os.path.abspath(options.root_dir)
    WORKDIR = os.path.abspath(options.work_dir)

    if options.shard_num > -1:
        WORKDIR = os.path.join(WORKDIR, str(options.shard_num))
    
    # RUN ALL TESTS!
    UNITTEST_MODULE = "Cython"
    UNITTEST_ROOT = os.path.join(os.path.dirname(__file__), UNITTEST_MODULE)
    if WITH_CYTHON:
        if os.path.exists(WORKDIR):
            for path in os.listdir(WORKDIR):
                if path in ("support", "Cy3"): continue
                shutil.rmtree(os.path.join(WORKDIR, path), ignore_errors=True)
    if not os.path.exists(WORKDIR):
        os.makedirs(WORKDIR)

    if options.shard_num <= 0:
        sys.stderr.write("Python %s\n" % sys.version)
        sys.stderr.write("\n")
        if WITH_CYTHON:
            sys.stderr.write("Running tests against Cython %s\n" % get_version())
        else:
            sys.stderr.write("Running tests without Cython.\n")

    if options.for_debugging:
        options.cleanup_workdir = False
        options.cleanup_sharedlibs = False
        options.fork = False
        if WITH_CYTHON and include_debugger:
            from Cython.Compiler.Main import default_options as compiler_default_options
            compiler_default_options['gdb_debug'] = True
            compiler_default_options['output_dir'] = os.getcwd()

    if options.with_refnanny:
        from pyximport.pyxbuild import pyx_to_dll
        libpath = pyx_to_dll(os.path.join("Cython", "Runtime", "refnanny.pyx"),
                             build_in_temp=True,
                             pyxbuild_dir=os.path.join(WORKDIR, "support"))
        sys.path.insert(0, os.path.split(libpath)[0])
        CFLAGS.append("-DCYTHON_REFNANNY=1")

    if options.xml_output_dir and options.fork:
        # doesn't currently work together
        sys.stderr.write("Disabling forked testing to support XML test output\n")
        options.fork = False

    if WITH_CYTHON and options.language_level == 3:
        sys.stderr.write("Using Cython language level 3.\n")

    test_bugs = False
    if options.tickets:
        for ticket_number in options.tickets:
            test_bugs = True
            cmd_args.append('ticket:%s' % ticket_number)
    if not test_bugs:
        for selector in cmd_args:
            if selector.startswith('bugs'):
                test_bugs = True

    selectors = [ string_selector(r) for r in cmd_args ]
    if not selectors:
        selectors = [ lambda x, tags=None: True ]

    # Chech which external modules are not present and exclude tests
    # which depends on them (by prefix)

    missing_dep_excluder = MissingDependencyExcluder(EXT_DEP_MODULES)
    version_dep_excluder = VersionDependencyExcluder(VER_DEP_MODULES)
    exclude_selectors = [missing_dep_excluder, version_dep_excluder] # want to print msg at exit

    if options.exclude:
        exclude_selectors += [ string_selector(r) for r in options.exclude ]

    if options.shard_num > -1:
        exclude_selectors.append(ShardExcludeSelector(options.shard_num, options.shard_count))

    if not test_bugs:
        exclude_selectors += [ FileListExcluder(os.path.join(ROOTDIR, "bugs.txt")) ]

    if sys.platform in ['win32', 'cygwin'] and sys.version_info < (2,6):
        exclude_selectors += [ lambda x: x == "run.specialfloat" ]

    global COMPILER
    if options.compiler:
        COMPILER = options.compiler

    selected_backends = [ name.strip() for name in options.backends.split(',') if name.strip() ]
    backends = []
    for backend in selected_backends:
        if backend == 'c' and not options.use_c:
            continue
        elif backend == 'cpp' and not options.use_cpp:
            continue
        elif backend not in BACKENDS:
            sys.stderr.write("Unknown backend requested: '%s' not one of [%s]\n" % (
                backend, ','.join(BACKENDS)))
            sys.exit(1)
        backends.append(backend)
    if options.shard_num <= 0:
        sys.stderr.write("Backends: %s\n" % ','.join(backends))
    languages = backends

    sys.stderr.write("\n")

    test_suite = unittest.TestSuite()

    if options.unittests:
        collect_unittests(UNITTEST_ROOT, UNITTEST_MODULE + ".", test_suite, selectors, exclude_selectors)

    if options.doctests:
        collect_doctests(UNITTEST_ROOT, UNITTEST_MODULE + ".", test_suite, selectors, exclude_selectors)

    if options.filetests and languages:
        filetests = TestBuilder(ROOTDIR, WORKDIR, selectors, exclude_selectors,
                                options.annotate_source, options.cleanup_workdir,
                                options.cleanup_sharedlibs, options.cleanup_failures,
                                options.pyregr,
                                options.cython_only, languages, test_bugs,
                                options.fork, options.language_level)
        test_suite.addTest(filetests.build_suite())

    if options.system_pyregr and languages:
        sys_pyregr_dir = os.path.join(sys.prefix, 'lib', 'python'+sys.version[:3], 'test')
        if os.path.isdir(sys_pyregr_dir):
            filetests = TestBuilder(ROOTDIR, WORKDIR, selectors, exclude_selectors,
                                    options.annotate_source, options.cleanup_workdir,
                                    options.cleanup_sharedlibs, options.cleanup_failures,
                                    True,
                                    options.cython_only, languages, test_bugs,
                                    options.fork, sys.version_info[0])
            sys.stderr.write("Including CPython regression tests in %s\n" % sys_pyregr_dir)
            test_suite.addTest(filetests.handle_directory(sys_pyregr_dir, 'pyregr'))

    if options.xml_output_dir:
        from Cython.Tests.xmlrunner import XMLTestRunner
        test_runner = XMLTestRunner(output=options.xml_output_dir,
                                    verbose=options.verbosity > 0)
    else:
        test_runner = unittest.TextTestRunner(verbosity=options.verbosity)

    if options.pyximport_py:
        from pyximport import pyximport
        pyximport.install(pyimport=True, build_dir=os.path.join(WORKDIR, '_pyximport'),
                          load_py_module_on_import_failure=True, inplace=True)

    result = test_runner.run(test_suite)

    if coverage is not None:
        coverage.stop()
        ignored_modules = ('Options', 'Version', 'DebugFlags', 'CmdLine')
        modules = [ module for name, module in sys.modules.items()
                    if module is not None and
                    name.startswith('Cython.Compiler.') and
                    name[len('Cython.Compiler.'):] not in ignored_modules ]
        if options.coverage:
            coverage.report(modules, show_missing=0)
        if options.coverage_xml:
            coverage.xml_report(modules, outfile="coverage-report.xml")
        if options.coverage_html:
            coverage.html_report(modules, directory="coverage-report-html")

    if missing_dep_excluder.tests_missing_deps:
        sys.stderr.write("Following tests excluded because of missing dependencies on your system:\n")
        for test in missing_dep_excluder.tests_missing_deps:
            sys.stderr.write("   %s\n" % test)

    if options.with_refnanny:
        import refnanny
        sys.stderr.write("\n".join([repr(x) for x in refnanny.reflog]))

    if options.exit_ok:
        return options.shard_num, 0
    else:
        return options.shard_num, not result.wasSuccessful()


if __name__ == '__main__':
    try:
        main()
    except SystemExit: # <= Py2.4 ...
        raise
    except Exception:
        traceback.print_exc()
        try:
            check_thread_termination(ignore_seen=False)
        except PendingThreadsError:
            # normal program exit won't kill the threads, do it the hard way here
            flush_and_terminate(1)