/usr/lib/python2.7/dist-packages/webassets/utils.py is in python-webassets 3:0.10.1-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 | from webassets import six
import contextlib
import os
import sys
from itertools import takewhile
from .exceptions import BundleError
__all__ = ('md5_constructor', 'pickle', 'set', 'StringIO',
'common_path_prefix', 'working_directory', 'is_url')
if sys.version_info >= (2, 5):
import hashlib
md5_constructor = hashlib.md5
else:
import md5
md5_constructor = md5.new
try:
import cPickle as pickle
except ImportError:
import pickle
try:
set
except NameError:
from sets import Set as set
else:
set = set
from webassets.six import StringIO
try:
from urllib import parse as urlparse
except ImportError: # Python 2
import urlparse
import urllib
def hash_func(data):
from .cache import make_md5
return make_md5(data)
def common_path_prefix(paths, sep=os.path.sep):
"""os.path.commonpath() is completely in the wrong place; it's
useless with paths since it only looks at one character at a time,
see http://bugs.python.org/issue10395
This replacement is from:
http://rosettacode.org/wiki/Find_Common_Directory_Path#Python
"""
def allnamesequal(name):
return all(n==name[0] for n in name[1:])
bydirectorylevels = zip(*[p.split(sep) for p in paths])
return sep.join(x[0] for x in takewhile(allnamesequal, bydirectorylevels))
@contextlib.contextmanager
def working_directory(directory=None, filename=None):
"""A context manager which changes the working directory to the given
path, and then changes it back to its previous value on exit.
Filters will often find this helpful.
Instead of a ``directory``, you may also give a ``filename``, and the
working directory will be set to the directory that file is in.s
"""
assert bool(directory) != bool(filename) # xor
if not directory:
directory = os.path.dirname(filename)
prev_cwd = os.getcwd()
os.chdir(directory)
try:
yield
finally:
os.chdir(prev_cwd)
def make_option_resolver(clazz=None, attribute=None, classes=None,
allow_none=True, desc=None):
"""Returns a function which can resolve an option to an object.
The option may given as an instance or a class (of ``clazz``, or
duck-typed with an attribute ``attribute``), or a string value referring
to a class as defined by the registry in ``classes``.
This support arguments, so an option may look like this:
cache:/tmp/cachedir
If this must instantiate a class, it will pass such an argument along,
if given. In addition, if the class to be instantiated has a classmethod
``make()``, this method will be used as a factory, and will be given an
Environment object (if one has been passed to the resolver). This allows
classes that need it to initialize themselves based on an Environment.
"""
assert clazz or attribute or classes
desc_string = ' to %s' % desc if desc else None
def instantiate(clazz, env, *a, **kw):
# Create an instance of clazz, via the Factory if one is defined,
# passing along the Environment, or creating the class directly.
if hasattr(clazz, 'make'):
# make() protocol is that if e.g. the get_manifest() resolver takes
# an env, then the first argument of the factory is the env.
args = (env,) + a if env is not None else a
return clazz.make(*args, **kw)
return clazz(*a, **kw)
def resolve_option(option, env=None):
the_clazz = clazz() if callable(clazz) and not isinstance(option, type) else clazz
if not option and allow_none:
return None
# If the value has one of the support attributes (duck-typing).
if attribute and hasattr(option, attribute):
if isinstance(option, type):
return instantiate(option, env)
return option
# If it is the class we support.
if the_clazz and isinstance(option, the_clazz):
return option
elif isinstance(option, type) and issubclass(option, the_clazz):
return instantiate(option, env)
# If it is a string
elif isinstance(option, six.string_types):
parts = option.split(':', 1)
key = parts[0]
arg = parts[1] if len(parts) > 1 else None
if key in classes:
return instantiate(classes[key], env, *([arg] if arg else []))
raise ValueError('%s cannot be resolved%s' % (option, desc_string))
resolve_option.__doc__ = """Resolve ``option``%s.""" % desc_string
return resolve_option
def RegistryMetaclass(clazz=None, attribute=None, allow_none=True, desc=None):
"""Returns a metaclass which will keep a registry of all subclasses, keyed
by their ``id`` attribute.
The metaclass will also have a ``resolve`` method which can turn a string
into an instance of one of the classes (based on ``make_option_resolver``).
"""
def eq(self, other):
"""Return equality with config values that instantiate this."""
return (hasattr(self, 'id') and self.id == other) or\
id(self) == id(other)
def unicode(self):
return "%s" % (self.id if hasattr(self, 'id') else repr(self))
class Metaclass(type):
REGISTRY = {}
def __new__(mcs, name, bases, attrs):
if not '__eq__' in attrs:
attrs['__eq__'] = eq
if not '__unicode__' in attrs:
attrs['__unicode__'] = unicode
if not '__str__' in attrs:
attrs['__str__'] = unicode
new_klass = type.__new__(mcs, name, bases, attrs)
if hasattr(new_klass, 'id'):
mcs.REGISTRY[new_klass.id] = new_klass
return new_klass
resolve = staticmethod(make_option_resolver(
clazz=clazz,
attribute=attribute,
allow_none=allow_none,
desc=desc,
classes=REGISTRY
))
return Metaclass
def cmp_debug_levels(level1, level2):
"""cmp() for debug levels, returns True if ``level1`` is higher
than ``level2``."""
level_ints = {False: 0, 'merge': 1, True: 2}
try:
cmp = lambda a, b: (a > b) - (a < b) # 333
return cmp(level_ints[level1], level_ints[level2])
except KeyError as e:
# Not sure if a dependency on BundleError is proper here. Validating
# debug values should probably be done on assign. But because this
# needs to happen in two places (Environment and Bundle) we do it here.
raise BundleError('Invalid debug value: %s' % e)
def is_url(s):
if not isinstance(s, str):
return False
parsed = urlparse.urlsplit(s)
return bool(parsed.scheme and parsed.netloc) and len(parsed.scheme) > 1
|