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util.py

"""Utility functions and classes used by nose internally.
"""
import inspect
import itertools
import logging
import stat
import os
import re
import sys
import types
import unittest
from nose.pyversion import ClassType, TypeType, isgenerator, ismethod

log = logging.getLogger('nose')

ident_re = re.compile(r'^[A-Za-z_][A-Za-z0-9_.]*$')
class_types = (ClassType, TypeType)
skip_pattern = r"(?:\.svn)|(?:[^.]+\.py[co])|(?:.*~)|(?:.*\$py\.class)|(?:__pycache__)"

try:
    set()
    set = set # make from nose.util import set happy
except NameError:
    try:
        from sets import Set as set
    except ImportError:
        pass

def ls_tree(dir_path="",
            skip_pattern=skip_pattern,
            indent="|-- ", branch_indent="|   ",
            last_indent="`-- ", last_branch_indent="    "):
    # TODO: empty directories look like non-directory files
    return "\n".join(_ls_tree_lines(dir_path, skip_pattern,
                                    indent, branch_indent,
                                    last_indent, last_branch_indent))

def _ls_tree_lines(dir_path, skip_pattern,
                   indent, branch_indent, last_indent, last_branch_indent):
    if dir_path == "":
        dir_path = os.getcwd()

lines = []

names = os.listdir(dir_path)
    names.sort()
    dirs, nondirs = [], []
    for name in names:
        if re.match(skip_pattern, name):
            continue
        if os.path.isdir(os.path.join(dir_path, name)):
            dirs.append(name)
        else:
            nondirs.append(name)

# list non-directories first
    entries = list(itertools.chain([(name, False) for name in nondirs],
                                   [(name, True) for name in dirs]))
    def ls_entry(name, is_dir, ind, branch_ind):
        if not is_dir:
            yield ind + name
        else:
            path = os.path.join(dir_path, name)
            if not os.path.islink(path):
                yield ind + name
                subtree = _ls_tree_lines(path, skip_pattern,
                                         indent, branch_indent,
                                         last_indent, last_branch_indent)
                for x in subtree:
                    yield branch_ind + x
    for name, is_dir in entries[:-1]:
        for line in ls_entry(name, is_dir, indent, branch_indent):
            yield line
    if entries:
        name, is_dir = entries[-1]
        for line in ls_entry(name, is_dir, last_indent, last_branch_indent):
            yield line

def absdir(path):
    """Return absolute, normalized path to directory, if it exists; None
    otherwise.
    """
    if not os.path.isabs(path):
        path = os.path.normpath(os.path.abspath(os.path.join(os.getcwd(),
                                                             path)))
    if path is None or not os.path.isdir(path):
        return None
    return path

def absfile(path, where=None):
    """Return absolute, normalized path to file (optionally in directory
    where), or None if the file can't be found either in where or the current
    working directory.
    """
    orig = path
    if where is None:
        where = os.getcwd()
    if isinstance(where, list) or isinstance(where, tuple):
        for maybe_path in where:
            maybe_abs = absfile(path, maybe_path)
            if maybe_abs is not None:
                return maybe_abs
        return None
    if not os.path.isabs(path):
        path = os.path.normpath(os.path.abspath(os.path.join(where, path)))
    if path is None or not os.path.exists(path):
        if where != os.getcwd():
            # try the cwd instead
            path = os.path.normpath(os.path.abspath(os.path.join(os.getcwd(),
                                                                 orig)))
    if path is None or not os.path.exists(path):
        return None
    if os.path.isdir(path):
        # might want an __init__.py from pacakge
        init = os.path.join(path,'__init__.py')
        if os.path.isfile(init):
            return init
    elif os.path.isfile(path):
        return path
    return None

def anyp(predicate, iterable):
    for item in iterable:
        if predicate(item):
            return True
    return False

def file_like(name):
    """A name is file-like if it is a path that exists, or it has a
    directory part, or it ends in .py, or it isn't a legal python
    identifier.
    """
    return (os.path.exists(name)
            or os.path.dirname(name)
            or name.endswith('.py')
            or not ident_re.match(os.path.splitext(name)[0]))

def func_lineno(func):
    """Get the line number of a function. First looks for
    compat_co_firstlineno, then func_code.co_first_lineno.
    """
    try:
        return func.compat_co_firstlineno
    except AttributeError:
        try:
            return func.__code__.co_firstlineno
        except AttributeError:
            return -1

def isclass(obj):
    """Is obj a class? Inspect's isclass is too liberal and returns True
    for objects that can't be subclasses of anything.
    """
    obj_type = type(obj)
    return obj_type in class_types or issubclass(obj_type, type)

# backwards compat (issue #64)
is_generator = isgenerator

def ispackage(path):
    """
    Is this path a package directory?

>>> ispackage('nose')
    True
    >>> ispackage('unit_tests')
    False
    >>> ispackage('nose/plugins')
    True
    >>> ispackage('nose/loader.py')
    False
    """
    if os.path.isdir(path):
        # at least the end of the path must be a legal python identifier
        # and __init__.py[co] must exist
        end = os.path.basename(path)
        if ident_re.match(end):
            for init in ('__init__.py', '__init__.pyc', '__init__.pyo'):
                if os.path.isfile(os.path.join(path, init)):
                    return True
            if sys.platform.startswith('java') and \
                    os.path.isfile(os.path.join(path, '__init__$py.class')):
                return True
    return False

def isproperty(obj):
    """
    Is this a property?

>>> class Foo:
    ...     def got(self):
    ...         return 2
    ...     def get(self):
    ...         return 1
    ...     get = property(get)

>>> isproperty(Foo.got)
    False
    >>> isproperty(Foo.get)
    True
    """
    return type(obj) == property

def getfilename(package, relativeTo=None):
    """Find the python source file for a package, relative to a
    particular directory (defaults to current working directory if not
    given).
    """
    if relativeTo is None:
        relativeTo = os.getcwd()
    path = os.path.join(relativeTo, os.sep.join(package.split('.')))
    if os.path.exists(path + '/__init__.py'):
        return path
    filename = path + '.py'
    if os.path.exists(filename):
        return filename
    return None

def getpackage(filename):
    """
    Find the full dotted package name for a given python source file
    name. Returns None if the file is not a python source file.

>>> getpackage('foo.py')
    'foo'
    >>> getpackage('biff/baf.py')
    'baf'
    >>> getpackage('nose/util.py')
    'nose.util'

Works for directories too.

>>> getpackage('nose')
    'nose'
    >>> getpackage('nose/plugins')
    'nose.plugins'

And __init__ files stuck onto directories

>>> getpackage('nose/plugins/__init__.py')
    'nose.plugins'

Absolute paths also work.

>>> path = os.path.abspath(os.path.join('nose', 'plugins'))
    >>> getpackage(path)
    'nose.plugins'
    """
    src_file = src(filename)
    if (os.path.isdir(src_file) or not src_file.endswith('.py')) and not ispackage(src_file):
        return None
    base, ext = os.path.splitext(os.path.basename(src_file))
    if base == '__init__':
        mod_parts = []
    else:
        mod_parts = [base]
    path, part = os.path.split(os.path.split(src_file)[0])
    while part:
        if ispackage(os.path.join(path, part)):
            mod_parts.append(part)
        else:
            break
        path, part = os.path.split(path)
    mod_parts.reverse()
    return '.'.join(mod_parts)

def ln(label):
    """Draw a 70-char-wide divider, with label in the middle.

>>> ln('hello there')
    '---------------------------- hello there -----------------------------'
    """
    label_len = len(label) + 2
    chunk = (70 - label_len) // 2
    out = '%s %s %s' % ('-' * chunk, label, '-' * chunk)
    pad = 70 - len(out)
    if pad > 0:
        out = out + ('-' * pad)
    return out

def resolve_name(name, module=None):
    """Resolve a dotted name to a module and its parts. This is stolen
    wholesale from unittest.TestLoader.loadTestByName.

>>> resolve_name('nose.util') #doctest: +ELLIPSIS
    <module 'nose.util' from...>
    >>> resolve_name('nose.util.resolve_name') #doctest: +ELLIPSIS
    <function resolve_name at...>
    """
    parts = name.split('.')
    parts_copy = parts[:]
    if module is None:
        while parts_copy:
            try:
                log.debug("__import__ %s", name)
                module = __import__('.'.join(parts_copy))
                break
            except ImportError:
                del parts_copy[-1]
                if not parts_copy:
                    raise
        parts = parts[1:]
    obj = module
    log.debug("resolve: %s, %s, %s, %s", parts, name, obj, module)
    for part in parts:
        obj = getattr(obj, part)
    return obj

def split_test_name(test):
    """Split a test name into a 3-tuple containing file, module, and callable
    names, any of which (but not all) may be blank.

Test names are in the form:

file_or_module:callable

Either side of the : may be dotted. To change the splitting behavior, you
    can alter nose.util.split_test_re.
    """
    norm = os.path.normpath
    file_or_mod = test
    fn = None
    if not ':' in test:
        # only a file or mod part
        if file_like(test):
            return (norm(test), None, None)
        else:
            return (None, test, None)

# could be path|mod:callable, or a : in the file path someplace
    head, tail = os.path.split(test)
    if not head:
        # this is a case like 'foo:bar' -- generally a module
        # name followed by a callable, but also may be a windows
        # drive letter followed by a path
        try:
            file_or_mod, fn = test.split(':')
            if file_like(fn):
                # must be a funny path
                file_or_mod, fn = test, None
        except ValueError:
            # more than one : in the test
            # this is a case like c:\some\path.py:a_test
            parts = test.split(':')
            if len(parts[0]) == 1:
                file_or_mod, fn = ':'.join(parts[:-1]), parts[-1]
            else:
                # nonsense like foo:bar:baz
                raise ValueError("Test name '%s' could not be parsed. Please "
                                 "format test names as path:callable or "
                                 "module:callable." % (test,))
    elif not tail:
        # this is a case like 'foo:bar/'
        # : must be part of the file path, so ignore it
        file_or_mod = test
    else:
        if ':' in tail:
            file_part, fn = tail.split(':')
        else:
            file_part = tail
        file_or_mod = os.sep.join([head, file_part])
    if file_or_mod:
        if file_like(file_or_mod):
            return (norm(file_or_mod), None, fn)
        else:
            return (None, file_or_mod, fn)
    else:
        return (None, None, fn)
split_test_name.__test__ = False # do not collect

def test_address(test):
    """Find the test address for a test, which may be a module, filename,
    class, method or function.
    """
    if hasattr(test, "address"):
        return test.address()
    # type-based polymorphism sucks in general, but I believe is
    # appropriate here
    t = type(test)
    file = module = call = None
    if t == types.ModuleType:
        file = getattr(test, '__file__', None)
        module = getattr(test, '__name__', None)
        return (src(file), module, call)
    if t == types.FunctionType or issubclass(t, type) or t == type:
        module = getattr(test, '__module__', None)
        if module is not None:
            m = sys.modules[module]
            file = getattr(m, '__file__', None)
            if file is not None:
                file = os.path.abspath(file)
        call = getattr(test, '__name__', None)
        return (src(file), module, call)
    if t == types.MethodType:
        cls_adr = test_address(test.__self__.__class__)
        return (src(cls_adr[0]), cls_adr[1],
                "%s.%s" % (cls_adr[2], test.__name__))
    # handle unittest.TestCase instances
    if isinstance(test, unittest.TestCase):
        if (hasattr(test, '_FunctionTestCase__testFunc') # pre 2.7
            or hasattr(test, '_testFunc')):              # 2.7
            # unittest FunctionTestCase
            try:
                return test_address(test._FunctionTestCase__testFunc)
            except AttributeError:
                return test_address(test._testFunc)
        # regular unittest.TestCase
        cls_adr = test_address(test.__class__)
        # 2.5 compat: __testMethodName changed to _testMethodName
        try:
            method_name = test._TestCase__testMethodName
        except AttributeError:
            method_name = test._testMethodName
        return (src(cls_adr[0]), cls_adr[1],
                "%s.%s" % (cls_adr[2], method_name))
    if (hasattr(test, '__class__') and
            test.__class__.__module__ not in ('__builtin__', 'builtins')):
        return test_address(test.__class__)
    raise TypeError("I don't know what %s is (%s)" % (test, t))
test_address.__test__ = False # do not collect

def try_run(obj, names):
    """Given a list of possible method names, try to run them with the
    provided object. Keep going until something works. Used to run
    setup/teardown methods for module, package, and function tests.
    """
    for name in names:
        func = getattr(obj, name, None)
        if func is not None:
            if type(obj) == types.ModuleType:
                # py.test compatibility
                if isinstance(func, types.FunctionType):
                    args, varargs, varkw, defaults = \
                        inspect.getargspec(func)
                else:
                    # Not a function. If it's callable, call it anyway
                    if hasattr(func, '__call__') and not inspect.ismethod(func):
                        func = func.__call__
                    try:
                        args, varargs, varkw, defaults = \
                            inspect.getargspec(func)
                        args.pop(0) # pop the self off
                    except TypeError:
                        raise TypeError("Attribute %s of %r is not a python "
                                        "function. Only functions or callables"
                                        " may be used as fixtures." %
                                        (name, obj))
                if len(args):
                    log.debug("call fixture %s.%s(%s)", obj, name, obj)
                    return func(obj)
            log.debug("call fixture %s.%s", obj, name)
            return func()

def src(filename):
    """Find the python source file for a .pyc, .pyo or $py.class file on
    jython. Returns the filename provided if it is not a python source
    file.
    """
    if filename is None:
        return filename
    if sys.platform.startswith('java') and filename.endswith('$py.class'):
        return '.'.join((filename[:-9], 'py'))
    base, ext = os.path.splitext(filename)
    if ext in ('.pyc', '.pyo', '.py'):
        return '.'.join((base, 'py'))
    return filename

def regex_last_key(regex):
    """Sort key function factory that puts items that match a
    regular expression last.

>>> from nose.config import Config
    >>> from nose.pyversion import sort_list
    >>> c = Config()
    >>> regex = c.testMatch
    >>> entries = ['.', '..', 'a_test', 'src', 'lib', 'test', 'foo.py']
    >>> sort_list(entries, regex_last_key(regex))
    >>> entries
    ['.', '..', 'foo.py', 'lib', 'src', 'a_test', 'test']
    """
    def k(obj):
        if regex.search(obj):
            return (1, obj)
        return (0, obj)
    return k

def tolist(val):
    """Convert a value that may be a list or a (possibly comma-separated)
    string into a list. The exception: None is returned as None, not [None].

>>> tolist(["one", "two"])
    ['one', 'two']
    >>> tolist("hello")
    ['hello']
    >>> tolist("separate,values, with, commas,  spaces , are    ,ok")
    ['separate', 'values', 'with', 'commas', 'spaces', 'are', 'ok']
    """
    if val is None:
        return None
    try:
        # might already be a list
        val.extend([])
        return val
    except AttributeError:
        pass
    # might be a string
    try:
        return re.split(r'\s*,\s*', val)
    except TypeError:
        # who knows...
        return list(val)

class odict(dict):
    """Simple ordered dict implementation, based on:

http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/107747
    """
    def __init__(self, *arg, **kw):
        self._keys = []
        super(odict, self).__init__(*arg, **kw)

def __delitem__(self, key):
        super(odict, self).__delitem__(key)
        self._keys.remove(key)

def __setitem__(self, key, item):
        super(odict, self).__setitem__(key, item)
        if key not in self._keys:
            self._keys.append(key)

def __str__(self):
        return "{%s}" % ', '.join(["%r: %r" % (k, v) for k, v in list(self.items())])

def clear(self):
        super(odict, self).clear()
        self._keys = []

def copy(self):
        d = super(odict, self).copy()
        d._keys = self._keys[:]
        return d

def items(self):
        return list(zip(self._keys, list(self.values())))

def keys(self):
        return self._keys[:]

def setdefault(self, key, failobj=None):
        item = super(odict, self).setdefault(key, failobj)
        if key not in self._keys:
            self._keys.append(key)
        return item

def update(self, dict):
        super(odict, self).update(dict)
        for key in list(dict.keys()):
            if key not in self._keys:
                self._keys.append(key)

def values(self):
        return list(map(self.get, self._keys))

def transplant_func(func, module):
    """
    Make a function imported from module A appear as if it is located
    in module B.

>>> from pprint import pprint
    >>> pprint.__module__
    'pprint'
    >>> pp = transplant_func(pprint, __name__)
    >>> pp.__module__
    'nose.util'

The original function is not modified.

>>> pprint.__module__
    'pprint'

Calling the transplanted function calls the original.

>>> pp([1, 2])
    [1, 2]
    >>> pprint([1,2])
    [1, 2]

"""
    from nose.tools import make_decorator
    if isgenerator(func):
        def newfunc(*arg, **kw):
            for v in func(*arg, **kw):
                yield v
    else:
        def newfunc(*arg, **kw):
            return func(*arg, **kw)

newfunc = make_decorator(func)(newfunc)
    newfunc.__module__ = module
    return newfunc

def transplant_class(cls, module):
    """
    Make a class appear to reside in `module`, rather than the module in which
    it is actually defined.

>>> from nose.failure import Failure
    >>> Failure.__module__
    'nose.failure'
    >>> Nf = transplant_class(Failure, __name__)
    >>> Nf.__module__
    'nose.util'
    >>> Nf.__name__
    'Failure'

"""
    class C(cls):
        pass
    C.__module__ = module
    C.__name__ = cls.__name__
    return C

def safe_str(val, encoding='utf-8'):
    try:
        return str(val)
    except UnicodeEncodeError:
        if isinstance(val, Exception):
            return ' '.join([safe_str(arg, encoding)
                             for arg in val])
        return str(val).encode(encoding)

def is_executable(file):
    if not os.path.exists(file):
        return False
    st = os.stat(file)
    return bool(st.st_mode & (stat.S_IXUSR | stat.S_IXGRP | stat.S_IXOTH))

if __name__ == '__main__':
    import doctest
    doctest.testmod()

Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	root/root	drwxr-xr-x	2025-04-04 07:57:29
..	dir	-	root/root	drwxr-xr-x	2025-12-03 09:32:43
__pycache__	dir	-	root/root	drwxr-xr-x	2025-04-04 07:57:29
ext	dir	-	root/root	drwxr-xr-x	2025-04-04 07:57:29
plugins	dir	-	root/root	drwxr-xr-x	2025-04-04 07:57:29
sphinx	dir	-	root/root	drwxr-xr-x	2025-04-04 07:57:29
tools	dir	-	root/root	drwxr-xr-x	2025-04-04 07:57:29
__init__.py	text/x-script.python	404 B	root/root	-rw-r--r--	2025-04-04 07:57:29
__main__.py	text/x-script.python	144 B	root/root	-rw-r--r--	2025-04-04 07:57:29
case.py	text/plain	12.91 KB	root/root	-rw-r--r--	2025-04-04 07:57:29
commands.py	text/plain	6.17 KB	root/root	-rw-r--r--	2025-04-04 07:57:29
config.py	text/x-script.python	24.69 KB	root/root	-rw-r--r--	2025-04-04 07:57:29
core.py	text/plain	12.76 KB	root/root	-rw-r--r--	2025-04-04 07:57:29
exc.py	text/plain	376 B	root/root	-rw-r--r--	2025-04-04 07:57:29
failure.py	text/x-script.python	1.24 KB	root/root	-rw-r--r--	2025-04-04 07:57:29
importer.py	text/plain	5.84 KB	root/root	-rw-r--r--	2025-04-04 07:57:29
inspector.py	text/plain	6.88 KB	root/root	-rw-r--r--	2025-04-04 07:57:29
loader.py	text/plain	24.98 KB	root/root	-rw-r--r--	2025-04-04 07:57:29
proxy.py	text/plain	6.72 KB	root/root	-rw-r--r--	2025-04-04 07:57:29
pyversion.py	text/plain	7.28 KB	root/root	-rw-r--r--	2025-04-04 07:57:29
result.py	text/plain	6.58 KB	root/root	-rw-r--r--	2025-04-04 07:57:29
selector.py	text/plain	8.77 KB	root/root	-rw-r--r--	2025-04-04 07:57:29
suite.py	text/plain	21.88 KB	root/root	-rw-r--r--	2025-04-04 07:57:29
twistedtools.py	text/plain	5.41 KB	root/root	-rw-r--r--	2025-04-04 07:57:29
usage.txt	text/plain	4.32 KB	root/root	-rw-r--r--	2025-04-04 07:57:29
util.py	text/plain	19.86 KB	root/root	-rw-r--r--	2025-04-04 07:57:29