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import pkg_resources
from zope.component import queryUtility
from zope.interface import implements
from repoze.bfg.interfaces import IPackageOverrides
class OverrideProvider(pkg_resources.DefaultProvider):
def __init__(self, module):
pkg_resources.DefaultProvider.__init__(self, module)
self.module_name = module.__name__
def _get_overrides(self):
overrides = 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)
class PackageOverrides:
implements(IPackageOverrides)
def __init__(self, overridden_package):
self.overrides = []
self.overridden_package = overridden_package
def insert(self, path, package, prefix):
if 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)
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
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