"""Utility functions and classes used by nose internally.
"""
import inspect
import itertools
import logging
import os
import re
import sys
import types
import unittest
from nose.pyversion import ClassType, TypeType, isgenerator
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.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('.')))
suffixes = ('/__init__.py', '.py')
for suffix in suffixes:
filename = path + suffix
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.")
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 == types.ClassType:
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.im_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
try:
args, varargs, varkw, defaults = inspect.getargspec(func)
except TypeError:
# Not a function. If it's callable, call it anyway
if hasattr(func, '__call__'):
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 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 zip(self._keys, 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 dict.keys():
if key not in self._keys:
self._keys.append(key)
def values(self):
return 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
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 unicode(val).encode(encoding)
if __name__ == '__main__':
import doctest
doctest.testmod()
|
