/usr/lib/python2.7/dist-packages/pyramid/config/assets.py is in python-pyramid 1.4.5+dfsg-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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import sys
from zope.interface import implementer
from pyramid.interfaces import IPackageOverrides
from pyramid.exceptions import ConfigurationError
from pyramid.threadlocal import get_current_registry
from pyramid.util import action_method
class OverrideProvider(pkg_resources.DefaultProvider):
def __init__(self, module):
pkg_resources.DefaultProvider.__init__(self, module)
self.module_name = module.__name__
def _get_overrides(self):
reg = get_current_registry()
overrides = reg.queryUtility(IPackageOverrides, self.module_name)
return overrides
def get_resource_filename(self, manager, resource_name):
""" Return a true filesystem path for resource_name,
co-ordinating the extraction with manager, if the resource
must be unpacked to the filesystem.
"""
overrides = self._get_overrides()
if overrides is not None:
filename = overrides.get_filename(resource_name)
if filename is not None:
return filename
return pkg_resources.DefaultProvider.get_resource_filename(
self, manager, resource_name)
def get_resource_stream(self, manager, resource_name):
""" Return a readable file-like object for resource_name."""
overrides = self._get_overrides()
if overrides is not None:
stream = overrides.get_stream(resource_name)
if stream is not None:
return stream
return pkg_resources.DefaultProvider.get_resource_stream(
self, manager, resource_name)
def get_resource_string(self, manager, resource_name):
""" Return a string containing the contents of resource_name."""
overrides = self._get_overrides()
if overrides is not None:
string = overrides.get_string(resource_name)
if string is not None:
return string
return pkg_resources.DefaultProvider.get_resource_string(
self, manager, resource_name)
def has_resource(self, resource_name):
overrides = self._get_overrides()
if overrides is not None:
result = overrides.has_resource(resource_name)
if result is not None:
return result
return pkg_resources.DefaultProvider.has_resource(
self, resource_name)
def resource_isdir(self, resource_name):
overrides = self._get_overrides()
if overrides is not None:
result = overrides.isdir(resource_name)
if result is not None:
return result
return pkg_resources.DefaultProvider.resource_isdir(
self, resource_name)
def resource_listdir(self, resource_name):
overrides = self._get_overrides()
if overrides is not None:
result = overrides.listdir(resource_name)
if result is not None:
return result
return pkg_resources.DefaultProvider.resource_listdir(
self, resource_name)
@implementer(IPackageOverrides)
class PackageOverrides(object):
# pkg_resources arg in kw args below for testing
def __init__(self, package, pkg_resources=pkg_resources):
loader = self._real_loader = getattr(package, '__loader__', None)
if isinstance(loader, self.__class__):
self._real_loader = None
# We register ourselves as a __loader__ *only* to support the
# setuptools _find_adapter adapter lookup; this class doesn't
# actually support the PEP 302 loader "API". This is
# excusable due to the following statement in the spec:
# ... Loader objects are not
# required to offer any useful functionality (any such functionality,
# such as the zipimport get_data() method mentioned above, is
# optional)...
# A __loader__ attribute is basically metadata, and setuptools
# uses it as such.
package.__loader__ = self
# we call register_loader_type for every instantiation of this
# class; that's OK, it's idempotent to do it more than once.
pkg_resources.register_loader_type(self.__class__, OverrideProvider)
self.overrides = []
self.overridden_package_name = package.__name__
def insert(self, path, package, prefix):
if not path or path.endswith('/'):
override = DirectoryOverride(path, package, prefix)
else:
override = FileOverride(path, package, prefix)
self.overrides.insert(0, override)
return override
def search_path(self, resource_name):
for override in self.overrides:
o = override(resource_name)
if o is not None:
package, name = o
yield package, name
def get_filename(self, resource_name):
for package, rname in self.search_path(resource_name):
if pkg_resources.resource_exists(package, rname):
return pkg_resources.resource_filename(package, rname)
def get_stream(self, resource_name):
for package, rname in self.search_path(resource_name):
if pkg_resources.resource_exists(package, rname):
return pkg_resources.resource_stream(package, rname)
def get_string(self, resource_name):
for package, rname in self.search_path(resource_name):
if pkg_resources.resource_exists(package, rname):
return pkg_resources.resource_string(package, rname)
def has_resource(self, resource_name):
for package, rname in self.search_path(resource_name):
if pkg_resources.resource_exists(package, rname):
return True
def isdir(self, resource_name):
for package, rname in self.search_path(resource_name):
if pkg_resources.resource_exists(package, rname):
return pkg_resources.resource_isdir(package, rname)
def listdir(self, resource_name):
for package, rname in self.search_path(resource_name):
if pkg_resources.resource_exists(package, rname):
return pkg_resources.resource_listdir(package, rname)
@property
def real_loader(self):
if self._real_loader is None:
raise NotImplementedError()
return self._real_loader
def get_data(self, path):
""" See IPEP302Loader.
"""
return self.real_loader.get_data(path)
def is_package(self, fullname):
""" See IPEP302Loader.
"""
return self.real_loader.is_package(fullname)
def get_code(self, fullname):
""" See IPEP302Loader.
"""
return self.real_loader.get_code(fullname)
def get_source(self, fullname):
""" See IPEP302Loader.
"""
return self.real_loader.get_source(fullname)
class DirectoryOverride:
def __init__(self, path, package, prefix):
self.path = path
self.package = package
self.prefix = prefix
self.pathlen = len(self.path)
def __call__(self, resource_name):
if resource_name.startswith(self.path):
name = '%s%s' % (self.prefix, resource_name[self.pathlen:])
return self.package, name
class FileOverride:
def __init__(self, path, package, prefix):
self.path = path
self.package = package
self.prefix = prefix
def __call__(self, resource_name):
if resource_name == self.path:
return self.package, self.prefix
class AssetsConfiguratorMixin(object):
def _override(self, package, path, override_package, override_prefix,
PackageOverrides=PackageOverrides):
pkg_name = package.__name__
override_pkg_name = override_package.__name__
override = self.registry.queryUtility(IPackageOverrides, name=pkg_name)
if override is None:
override = PackageOverrides(package)
self.registry.registerUtility(override, IPackageOverrides,
name=pkg_name)
override.insert(path, override_pkg_name, override_prefix)
@action_method
def override_asset(self, to_override, override_with, _override=None):
""" Add a :app:`Pyramid` asset override to the current
configuration state.
``to_override`` is a :term:`asset specification` to the
asset being overridden.
``override_with`` is a :term:`asset specification` to the
asset that is performing the override.
See :ref:`assets_chapter` for more
information about asset overrides."""
if to_override == override_with:
raise ConfigurationError('You cannot override an asset with itself')
package = to_override
path = ''
if ':' in to_override:
package, path = to_override.split(':', 1)
override_package = override_with
override_prefix = ''
if ':' in override_with:
override_package, override_prefix = override_with.split(':', 1)
# *_isdir = override is package or directory
overridden_isdir = path=='' or path.endswith('/')
override_isdir = override_prefix=='' or override_prefix.endswith('/')
if overridden_isdir and (not override_isdir):
raise ConfigurationError(
'A directory cannot be overridden with a file (put a '
'slash at the end of override_with if necessary)')
if (not overridden_isdir) and override_isdir:
raise ConfigurationError(
'A file cannot be overridden with a directory (put a '
'slash at the end of to_override if necessary)')
override = _override or self._override # test jig
def register():
__import__(package)
__import__(override_package)
from_package = sys.modules[package]
to_package = sys.modules[override_package]
override(from_package, path, to_package, override_prefix)
intr = self.introspectable(
'asset overrides',
(package, override_package, path, override_prefix),
'%s -> %s' % (to_override, override_with),
'asset override',
)
intr['to_override'] = to_override
intr['override_with'] = override_with
self.action(None, register, introspectables=(intr,))
override_resource = override_asset # bw compat
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