+"""Package resource API
+--------------------
+
+A resource is a logical file contained within a package, or a logical
+subdirectory thereof. The package resource API expects resource names
+to have their path parts separated with ``/``, *not* whatever the local
+path separator is. Do not use os.path operations to manipulate resource
+names being passed into the API.
+
+The package resource API is designed to work with normal filesystem packages,
+.egg files, and unpacked .egg files. It can also work in a limited way with
+.zip files and with custom PEP 302 loaders that support the ``get_data()``
+method.
+"""
+
+import sys, os, zipimport, time, re, imp
+
+try:
+ frozenset
+except NameError:
+ from sets import ImmutableSet as frozenset
+
+# capture these to bypass sandboxing
+from os import utime, rename, unlink, mkdir
+from os import open as os_open
+from os.path import isdir, split
+
+def _bypass_ensure_directory(name, mode=0777):
+ # Sandbox-bypassing version of ensure_directory()
+ dirname, filename = split(name)
+ if dirname and filename and not isdir(dirname):
+ _bypass_ensure_directory(dirname)
+ mkdir(dirname, mode)
+
+
+
+
+
+
+
+
+_state_vars = {}
+
+def _declare_state(vartype, **kw):
+ g = globals()
+ for name, val in kw.iteritems():
+ g[name] = val
+ _state_vars[name] = vartype
+
+def __getstate__():
+ state = {}
+ g = globals()
+ for k, v in _state_vars.iteritems():
+ state[k] = g['_sget_'+v](g[k])
+ return state
+
+def __setstate__(state):
+ g = globals()
+ for k, v in state.iteritems():
+ g['_sset_'+_state_vars[k]](k, g[k], v)
+ return state
+
+def _sget_dict(val):
+ return val.copy()
+
+def _sset_dict(key, ob, state):
+ ob.clear()
+ ob.update(state)
+
+def _sget_object(val):
+ return val.__getstate__()
+
+def _sset_object(key, ob, state):
+ ob.__setstate__(state)
+
+_sget_none = _sset_none = lambda *args: None
+
+
+
+
+
+
+def get_supported_platform():
+ """Return this platform's maximum compatible version.
+
+ distutils.util.get_platform() normally reports the minimum version
+ of Mac OS X that would be required to *use* extensions produced by
+ distutils. But what we want when checking compatibility is to know the
+ version of Mac OS X that we are *running*. To allow usage of packages that
+ explicitly require a newer version of Mac OS X, we must also know the
+ current version of the OS.
+
+ If this condition occurs for any other platform with a version in its
+ platform strings, this function should be extended accordingly.
+ """
+ plat = get_build_platform(); m = macosVersionString.match(plat)
+ if m is not None and sys.platform == "darwin":
+ try:
+ plat = 'macosx-%s-%s' % ('.'.join(_macosx_vers()[:2]), m.group(3))
+ except ValueError:
+ pass # not Mac OS X
+ return plat
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+__all__ = [
+ # Basic resource access and distribution/entry point discovery
+ 'require', 'run_script', 'get_provider', 'get_distribution',
+ 'load_entry_point', 'get_entry_map', 'get_entry_info', 'iter_entry_points',
+ 'resource_string', 'resource_stream', 'resource_filename',
+ 'resource_listdir', 'resource_exists', 'resource_isdir',
+
+ # Environmental control
+ 'declare_namespace', 'working_set', 'add_activation_listener',
+ 'find_distributions', 'set_extraction_path', 'cleanup_resources',
+ 'get_default_cache',
+
+ # Primary implementation classes
+ 'Environment', 'WorkingSet', 'ResourceManager',
+ 'Distribution', 'Requirement', 'EntryPoint',
+
+ # Exceptions
+ 'ResolutionError','VersionConflict','DistributionNotFound','UnknownExtra',
+ 'ExtractionError',
+
+ # Parsing functions and string utilities
+ 'parse_requirements', 'parse_version', 'safe_name', 'safe_version',
+ 'get_platform', 'compatible_platforms', 'yield_lines', 'split_sections',
+ 'safe_extra', 'to_filename',
+
+ # filesystem utilities
+ 'ensure_directory', 'normalize_path',
+
+ # Distribution "precedence" constants
+ 'EGG_DIST', 'BINARY_DIST', 'SOURCE_DIST', 'CHECKOUT_DIST', 'DEVELOP_DIST',
+
+ # "Provider" interfaces, implementations, and registration/lookup APIs
+ 'IMetadataProvider', 'IResourceProvider', 'FileMetadata',
+ 'PathMetadata', 'EggMetadata', 'EmptyProvider', 'empty_provider',
+ 'NullProvider', 'EggProvider', 'DefaultProvider', 'ZipProvider',
+ 'register_finder', 'register_namespace_handler', 'register_loader_type',
+ 'fixup_namespace_packages', 'get_importer',
+
+ # Deprecated/backward compatibility only
+ 'run_main', 'AvailableDistributions',
+]
+class ResolutionError(Exception):
+ """Abstract base for dependency resolution errors"""
+ def __repr__(self):
+ return self.__class__.__name__+repr(self.args)
+
+class VersionConflict(ResolutionError):
+ """An already-installed version conflicts with the requested version"""
+
+class DistributionNotFound(ResolutionError):
+ """A requested distribution was not found"""
+
+class UnknownExtra(ResolutionError):
+ """Distribution doesn't have an "extra feature" of the given name"""
+
+_provider_factories = {}
+PY_MAJOR = sys.version[:3]
+EGG_DIST = 3
+BINARY_DIST = 2
+SOURCE_DIST = 1
+CHECKOUT_DIST = 0
+DEVELOP_DIST = -1
+
+def register_loader_type(loader_type, provider_factory):
+ """Register `provider_factory` to make providers for `loader_type`
+
+ `loader_type` is the type or class of a PEP 302 ``module.__loader__``,
+ and `provider_factory` is a function that, passed a *module* object,
+ returns an ``IResourceProvider`` for that module.
+ """
+ _provider_factories[loader_type] = provider_factory
+
+def get_provider(moduleOrReq):
+ """Return an IResourceProvider for the named module or requirement"""
+ if isinstance(moduleOrReq,Requirement):
+ return working_set.find(moduleOrReq) or require(str(moduleOrReq))[0]
+ try:
+ module = sys.modules[moduleOrReq]
+ except KeyError:
+ __import__(moduleOrReq)
+ module = sys.modules[moduleOrReq]
+ loader = getattr(module, '__loader__', None)
+ return _find_adapter(_provider_factories, loader)(module)
+
+def _macosx_vers(_cache=[]):
+ if not _cache:
+ from platform import mac_ver
+ _cache.append(mac_ver()[0].split('.'))
+ return _cache[0]
+
+def _macosx_arch(machine):
+ return {'PowerPC':'ppc', 'Power_Macintosh':'ppc'}.get(machine,machine)
+
+def get_build_platform():
+ """Return this platform's string for platform-specific distributions
+
+ XXX Currently this is the same as ``distutils.util.get_platform()``, but it
+ needs some hacks for Linux and Mac OS X.
+ """
+ from distutils.util import get_platform
+ plat = get_platform()
+ if sys.platform == "darwin" and not plat.startswith('macosx-'):
+ try:
+ version = _macosx_vers()
+ machine = os.uname()[4].replace(" ", "_")
+ return "macosx-%d.%d-%s" % (int(version[0]), int(version[1]),
+ _macosx_arch(machine))
+ except ValueError:
+ # if someone is running a non-Mac darwin system, this will fall
+ # through to the default implementation
+ pass
+ return plat
+
+macosVersionString = re.compile(r"macosx-(\d+)\.(\d+)-(.*)")
+darwinVersionString = re.compile(r"darwin-(\d+)\.(\d+)\.(\d+)-(.*)")
+get_platform = get_build_platform # XXX backward compat
+
+
+
+
+
+
+
+def compatible_platforms(provided,required):
+ """Can code for the `provided` platform run on the `required` platform?
+
+ Returns true if either platform is ``None``, or the platforms are equal.
+
+ XXX Needs compatibility checks for Linux and other unixy OSes.
+ """
+ if provided is None or required is None or provided==required:
+ return True # easy case
+
+ # Mac OS X special cases
+ reqMac = macosVersionString.match(required)
+ if reqMac:
+ provMac = macosVersionString.match(provided)
+
+ # is this a Mac package?
+ if not provMac:
+ # this is backwards compatibility for packages built before
+ # setuptools 0.6. All packages built after this point will
+ # use the new macosx designation.
+ provDarwin = darwinVersionString.match(provided)
+ if provDarwin:
+ dversion = int(provDarwin.group(1))
+ macosversion = "%s.%s" % (reqMac.group(1), reqMac.group(2))
+ if dversion == 7 and macosversion >= "10.3" or \
+ dversion == 8 and macosversion >= "10.4":
+
+ #import warnings
+ #warnings.warn("Mac eggs should be rebuilt to "
+ # "use the macosx designation instead of darwin.",
+ # category=DeprecationWarning)
+ return True
+ return False # egg isn't macosx or legacy darwin
+
+ # are they the same major version and machine type?
+ if provMac.group(1) != reqMac.group(1) or \
+ provMac.group(3) != reqMac.group(3):
+ return False
+
+
+
+ # is the required OS major update >= the provided one?
+ if int(provMac.group(2)) > int(reqMac.group(2)):
+ return False
+
+ return True
+
+ # XXX Linux and other platforms' special cases should go here
+ return False
+
+
+def run_script(dist_spec, script_name):
+ """Locate distribution `dist_spec` and run its `script_name` script"""
+ ns = sys._getframe(1).f_globals
+ name = ns['__name__']
+ ns.clear()
+ ns['__name__'] = name
+ require(dist_spec)[0].run_script(script_name, ns)
+
+run_main = run_script # backward compatibility
+
+def get_distribution(dist):
+ """Return a current distribution object for a Requirement or string"""
+ if isinstance(dist,basestring): dist = Requirement.parse(dist)
+ if isinstance(dist,Requirement): dist = get_provider(dist)
+ if not isinstance(dist,Distribution):
+ raise TypeError("Expected string, Requirement, or Distribution", dist)
+ return dist
+
+def load_entry_point(dist, group, name):
+ """Return `name` entry point of `group` for `dist` or raise ImportError"""
+ return get_distribution(dist).load_entry_point(group, name)
+
+def get_entry_map(dist, group=None):
+ """Return the entry point map for `group`, or the full entry map"""
+ return get_distribution(dist).get_entry_map(group)
+
+def get_entry_info(dist, group, name):
+ """Return the EntryPoint object for `group`+`name`, or ``None``"""
+ return get_distribution(dist).get_entry_info(group, name)
+
+
+class IMetadataProvider:
+
+ def has_metadata(name):
+ """Does the package's distribution contain the named metadata?"""
+
+ def get_metadata(name):
+ """The named metadata resource as a string"""
+
+ def get_metadata_lines(name):
+ """Yield named metadata resource as list of non-blank non-comment lines
+
+ Leading and trailing whitespace is stripped from each line, and lines
+ with ``#`` as the first non-blank character are omitted."""
+
+ def metadata_isdir(name):
+ """Is the named metadata a directory? (like ``os.path.isdir()``)"""
+
+ def metadata_listdir(name):
+ """List of metadata names in the directory (like ``os.listdir()``)"""
+
+ def run_script(script_name, namespace):
+ """Execute the named script in the supplied namespace dictionary"""
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+class IResourceProvider(IMetadataProvider):
+ """An object that provides access to package resources"""
+
+ def get_resource_filename(manager, resource_name):
+ """Return a true filesystem path for `resource_name`
+
+ `manager` must be an ``IResourceManager``"""
+
+ def get_resource_stream(manager, resource_name):
+ """Return a readable file-like object for `resource_name`
+
+ `manager` must be an ``IResourceManager``"""
+
+ def get_resource_string(manager, resource_name):
+ """Return a string containing the contents of `resource_name`
+
+ `manager` must be an ``IResourceManager``"""
+
+ def has_resource(resource_name):
+ """Does the package contain the named resource?"""
+
+ def resource_isdir(resource_name):
+ """Is the named resource a directory? (like ``os.path.isdir()``)"""
+
+ def resource_listdir(resource_name):
+ """List of resource names in the directory (like ``os.listdir()``)"""
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+class WorkingSet(object):
+ """A collection of active distributions on sys.path (or a similar list)"""
+
+ def __init__(self, entries=None):
+ """Create working set from list of path entries (default=sys.path)"""
+ self.entries = []
+ self.entry_keys = {}
+ self.by_key = {}
+ self.callbacks = []
+
+ if entries is None:
+ entries = sys.path
+
+ for entry in entries:
+ self.add_entry(entry)
+
+
+ def add_entry(self, entry):
+ """Add a path item to ``.entries``, finding any distributions on it
+
+ ``find_distributions(entry, True)`` is used to find distributions
+ corresponding to the path entry, and they are added. `entry` is
+ always appended to ``.entries``, even if it is already present.
+ (This is because ``sys.path`` can contain the same value more than
+ once, and the ``.entries`` of the ``sys.path`` WorkingSet should always
+ equal ``sys.path``.)
+ """
+ self.entry_keys.setdefault(entry, [])
+ self.entries.append(entry)
+ for dist in find_distributions(entry, True):
+ self.add(dist, entry, False)
+
+
+ def __contains__(self,dist):
+ """True if `dist` is the active distribution for its project"""
+ return self.by_key.get(dist.key) == dist
+
+
+
+
+
+ def find(self, req):
+ """Find a distribution matching requirement `req`
+
+ If there is an active distribution for the requested project, this
+ returns it as long as it meets the version requirement specified by
+ `req`. But, if there is an active distribution for the project and it
+ does *not* meet the `req` requirement, ``VersionConflict`` is raised.
+ If there is no active distribution for the requested project, ``None``
+ is returned.
+ """
+ dist = self.by_key.get(req.key)
+ if dist is not None and dist not in req:
+ raise VersionConflict(dist,req) # XXX add more info
+ else:
+ return dist
+
+ def iter_entry_points(self, group, name=None):
+ """Yield entry point objects from `group` matching `name`
+
+ If `name` is None, yields all entry points in `group` from all
+ distributions in the working set, otherwise only ones matching
+ both `group` and `name` are yielded (in distribution order).
+ """
+ for dist in self:
+ entries = dist.get_entry_map(group)
+ if name is None:
+ for ep in entries.values():
+ yield ep
+ elif name in entries:
+ yield entries[name]
+
+ def run_script(self, requires, script_name):
+ """Locate distribution for `requires` and run `script_name` script"""
+ ns = sys._getframe(1).f_globals
+ name = ns['__name__']
+ ns.clear()
+ ns['__name__'] = name
+ self.require(requires)[0].run_script(script_name, ns)
+
+
+
+ def __iter__(self):
+ """Yield distributions for non-duplicate projects in the working set
+
+ The yield order is the order in which the items' path entries were
+ added to the working set.
+ """
+ seen = {}
+ for item in self.entries:
+ for key in self.entry_keys[item]:
+ if key not in seen:
+ seen[key]=1
+ yield self.by_key[key]
+
+ def add(self, dist, entry=None, insert=True):
+ """Add `dist` to working set, associated with `entry`
+
+ If `entry` is unspecified, it defaults to the ``.location`` of `dist`.
+ On exit from this routine, `entry` is added to the end of the working
+ set's ``.entries`` (if it wasn't already present).
+
+ `dist` is only added to the working set if it's for a project that
+ doesn't already have a distribution in the set. If it's added, any
+ callbacks registered with the ``subscribe()`` method will be called.
+ """
+ if insert:
+ dist.insert_on(self.entries, entry)
+
+ if entry is None:
+ entry = dist.location
+ keys = self.entry_keys.setdefault(entry,[])
+ keys2 = self.entry_keys.setdefault(dist.location,[])
+ if dist.key in self.by_key:
+ return # ignore hidden distros
+
+ # If we have a __requires__ then we can already tell if this
+ # dist is unsatisfactory, in which case we won't add it.
+ if __requires__ is not None:
+ for thisreqstr in __requires__:
+ for thisreq in parse_requirements(thisreqstr):
+ if thisreq.key == dist.key:
+ if dist not in thisreq:
+ return
+
+
+ self.by_key[dist.key] = dist
+ if dist.key not in keys:
+ keys.append(dist.key)
+ if dist.key not in keys2:
+ keys2.append(dist.key)
+ self._added_new(dist)
+
+ def resolve(self, requirements, env=None, installer=None):
+ """List all distributions needed to (recursively) meet `requirements`
+
+ `requirements` must be a sequence of ``Requirement`` objects. `env`,
+ if supplied, should be an ``Environment`` instance. If
+ not supplied, it defaults to all distributions available within any
+ entry or distribution in the working set. `installer`, if supplied,
+ will be invoked with each requirement that cannot be met by an
+ already-installed distribution; it should return a ``Distribution`` or
+ ``None``.
+ """
+
+ requirements = list(requirements)[::-1] # set up the stack
+ processed = {} # set of processed requirements
+ best = {} # key -> dist
+ to_activate = []
+
+ while requirements:
+ req = requirements.pop(0) # process dependencies breadth-first
+ if req in processed:
+ # Ignore cyclic or redundant dependencies
+ continue
+ dist = best.get(req.key)
+ if dist is None:
+ # Find the best distribution and add it to the map
+ dist = self.by_key.get(req.key)
+ if dist is None:
+ if env is None:
+ env = Environment(self.entries)
+ dist = best[req.key] = env.best_match(req, self, installer)
+ if dist is None:
+ raise DistributionNotFound(req) # XXX put more info here
+ to_activate.append(dist)
+ if dist not in req:
+ # Oops, the "best" so far conflicts with a dependency
+ raise VersionConflict(dist,req) # XXX put more info here
+ requirements.extend(dist.requires(req.extras)[::-1])
+ processed[req] = True
+
+ return to_activate # return list of distros to activate
+
+ def find_plugins(self,
+ plugin_env, full_env=None, installer=None, fallback=True
+ ):
+ """Find all activatable distributions in `plugin_env`
+
+ Example usage::
+
+ distributions, errors = working_set.find_plugins(
+ Environment(plugin_dirlist)
+ )
+ map(working_set.add, distributions) # add plugins+libs to sys.path
+ print "Couldn't load", errors # display errors
+
+ The `plugin_env` should be an ``Environment`` instance that contains
+ only distributions that are in the project's "plugin directory" or
+ directories. The `full_env`, if supplied, should be an ``Environment``
+ contains all currently-available distributions. If `full_env` is not
+ supplied, one is created automatically from the ``WorkingSet`` this
+ method is called on, which will typically mean that every directory on
+ ``sys.path`` will be scanned for distributions.
+
+ `installer` is a standard installer callback as used by the
+ ``resolve()`` method. The `fallback` flag indicates whether we should
+ attempt to resolve older versions of a plugin if the newest version
+ cannot be resolved.
+
+ This method returns a 2-tuple: (`distributions`, `error_info`), where
+ `distributions` is a list of the distributions found in `plugin_env`
+ that were loadable, along with any other distributions that are needed
+ to resolve their dependencies. `error_info` is a dictionary mapping
+ unloadable plugin distributions to an exception instance describing the
+ error that occurred. Usually this will be a ``DistributionNotFound`` or
+ ``VersionConflict`` instance.
+ """
+
+ plugin_projects = list(plugin_env)
+ plugin_projects.sort() # scan project names in alphabetic order
+
+ error_info = {}
+ distributions = {}
+
+ if full_env is None:
+ env = Environment(self.entries)
+ env += plugin_env
+ else:
+ env = full_env + plugin_env
+
+ shadow_set = self.__class__([])
+ map(shadow_set.add, self) # put all our entries in shadow_set
+
+ for project_name in plugin_projects:
+
+ for dist in plugin_env[project_name]:
+
+ req = [dist.as_requirement()]
+
+ try:
+ resolvees = shadow_set.resolve(req, env, installer)
+
+ except ResolutionError,v:
+ error_info[dist] = v # save error info
+ if fallback:
+ continue # try the next older version of project
+ else:
+ break # give up on this project, keep going
+
+ else:
+ map(shadow_set.add, resolvees)
+ distributions.update(dict.fromkeys(resolvees))
+
+ # success, no need to try any more versions of this project
+ break
+
+ distributions = list(distributions)
+ distributions.sort()
+
+ return distributions, error_info
+
+
+
+
+
+ def require(self, *requirements):
+ """Ensure that distributions matching `requirements` are activated
+
+ `requirements` must be a string or a (possibly-nested) sequence
+ thereof, specifying the distributions and versions required. The
+ return value is a sequence of the distributions that needed to be
+ activated to fulfill the requirements; all relevant distributions are
+ included, even if they were already activated in this working set.
+ """
+ needed = self.resolve(parse_requirements(requirements))
+
+ for dist in needed:
+ self.add(dist)
+
+ return needed
+
+ def subscribe(self, callback):
+ """Invoke `callback` for all distributions (including existing ones)"""
+ if callback in self.callbacks:
+ return
+ self.callbacks.append(callback)
+ for dist in self:
+ callback(dist)
+
+ def _added_new(self, dist):
+ for callback in self.callbacks:
+ callback(dist)
+
+ def __getstate__(self):
+ return (
+ self.entries[:], self.entry_keys.copy(), self.by_key.copy(),
+ self.callbacks[:]
+ )
+
+ def __setstate__(self, (entries, keys, by_key, callbacks)):
+ self.entries = entries[:]
+ self.entry_keys = keys.copy()
+ self.by_key = by_key.copy()
+ self.callbacks = callbacks[:]
+
+
+class Environment(object):
+ """Searchable snapshot of distributions on a search path"""
+
+ def __init__(self, search_path=None, platform=get_supported_platform(), python=PY_MAJOR):
+ """Snapshot distributions available on a search path
+
+ Any distributions found on `search_path` are added to the environment.
+ `search_path` should be a sequence of ``sys.path`` items. If not
+ supplied, ``sys.path`` is used.
+
+ `platform` is an optional string specifying the name of the platform
+ that platform-specific distributions must be compatible with. If
+ unspecified, it defaults to the current platform. `python` is an
+ optional string naming the desired version of Python (e.g. ``'2.4'``);
+ it defaults to the current version.
+
+ You may explicitly set `platform` (and/or `python`) to ``None`` if you
+ wish to map *all* distributions, not just those compatible with the
+ running platform or Python version.
+ """
+ self._distmap = {}
+ self._cache = {}
+ self.platform = platform
+ self.python = python
+ self.scan(search_path)
+
+ def can_add(self, dist):
+ """Is distribution `dist` acceptable for this environment?
+
+ The distribution must match the platform and python version
+ requirements specified when this environment was created, or False
+ is returned.
+ """
+ return (self.python is None or dist.py_version is None
+ or dist.py_version==self.python) \
+ and compatible_platforms(dist.platform,self.platform)
+
+ def remove(self, dist):
+ """Remove `dist` from the environment"""
+ self._distmap[dist.key].remove(dist)
+
+ def scan(self, search_path=None):
+ """Scan `search_path` for distributions usable in this environment
+
+ Any distributions found are added to the environment.
+ `search_path` should be a sequence of ``sys.path`` items. If not
+ supplied, ``sys.path`` is used. Only distributions conforming to
+ the platform/python version defined at initialization are added.
+ """
+ if search_path is None:
+ search_path = sys.path
+
+ for item in search_path:
+ for dist in find_distributions(item):
+ self.add(dist)
+
+ def __getitem__(self,project_name):
+ """Return a newest-to-oldest list of distributions for `project_name`
+ """
+ try:
+ return self._cache[project_name]
+ except KeyError:
+ project_name = project_name.lower()
+ if project_name not in self._distmap:
+ return []
+
+ if project_name not in self._cache:
+ dists = self._cache[project_name] = self._distmap[project_name]
+ _sort_dists(dists)
+
+ return self._cache[project_name]
+
+ def add(self,dist):
+ """Add `dist` if we ``can_add()`` it and it isn't already added"""
+ if self.can_add(dist) and dist.has_version():
+ dists = self._distmap.setdefault(dist.key,[])
+ if dist not in dists:
+ dists.append(dist)
+ if dist.key in self._cache:
+ _sort_dists(self._cache[dist.key])
+
+
+ def best_match(self, req, working_set, installer=None):
+ """Find distribution best matching `req` and usable on `working_set`
+
+ This calls the ``find(req)`` method of the `working_set` to see if a
+ suitable distribution is already active. (This may raise
+ ``VersionConflict`` if an unsuitable version of the project is already
+ active in the specified `working_set`.)
+
+ If a suitable distribution isn't active, this method returns the
+ newest platform-dependent distribution in the environment that meets
+ the ``Requirement`` in `req`. If no suitable platform-dependent
+ distribution is found, then the newest platform-independent
+ distribution that meets the requirement is returned. (A platform-
+ dependent distribution will typically have code compiled or
+ specialized for that platform.)
+
+ Otherwise, if `installer` is supplied, then the result of calling the
+ environment's ``obtain(req, installer)`` method will be returned.
+ """
+ dist = working_set.find(req)
+ if dist is not None:
+ return dist
+
+ # first try to find a platform-dependent dist
+ for dist in self[req.key]:
+ if dist in req and dist.platform is not None:
+ return dist
+
+ # then try any other dist
+ for dist in self[req.key]:
+ if dist in req:
+ return dist
+
+ return self.obtain(req, installer) # try and download/install
+
+ def obtain(self, requirement, installer=None):
+ """Obtain a distribution matching `requirement` (e.g. via download)
+
+ Obtain a distro that matches requirement (e.g. via download). In the
+ base ``Environment`` class, this routine just returns
+ ``installer(requirement)``, unless `installer` is None, in which case
+ None is returned instead. This method is a hook that allows subclasses
+ to attempt other ways of obtaining a distribution before falling back
+ to the `installer` argument."""
+ if installer is not None:
+ return installer(requirement)
+
+ def __iter__(self):
+ """Yield the unique project names of the available distributions"""
+ for key in self._distmap.keys():
+ if self[key]: yield key
+
+
+
+
+ def __iadd__(self, other):
+ """In-place addition of a distribution or environment"""
+ if isinstance(other,Distribution):
+ self.add(other)
+ elif isinstance(other,Environment):
+ for project in other:
+ for dist in other[project]:
+ self.add(dist)
+ else:
+ raise TypeError("Can't add %r to environment" % (other,))
+ return self
+
+ def __add__(self, other):
+ """Add an environment or distribution to an environment"""
+ new = self.__class__([], platform=None, python=None)
+ for env in self, other:
+ new += env
+ return new
+
+
+AvailableDistributions = Environment # XXX backward compatibility
+
+
+class ExtractionError(RuntimeError):
+ """An error occurred extracting a resource
+
+ The following attributes are available from instances of this exception:
+
+ manager
+ The resource manager that raised this exception
+
+ cache_path
+ The base directory for resource extraction
+
+ original_error
+ The exception instance that caused extraction to fail
+ """
+
+
+
+
+class ResourceManager:
+ """Manage resource extraction and packages"""
+ extraction_path = None
+
+ def __init__(self):
+ self.cached_files = {}
+
+ def resource_exists(self, package_or_requirement, resource_name):
+ """Does the named resource exist?"""
+ return get_provider(package_or_requirement).has_resource(resource_name)
+
+ def resource_isdir(self, package_or_requirement, resource_name):
+ """Is the named resource an existing directory?"""
+ return get_provider(package_or_requirement).resource_isdir(
+ resource_name
+ )
+
+ def resource_filename(self, package_or_requirement, resource_name):
+ """Return a true filesystem path for specified resource"""
+ return get_provider(package_or_requirement).get_resource_filename(
+ self, resource_name
+ )
+
+ def resource_stream(self, package_or_requirement, resource_name):
+ """Return a readable file-like object for specified resource"""
+ return get_provider(package_or_requirement).get_resource_stream(
+ self, resource_name
+ )
+
+ def resource_string(self, package_or_requirement, resource_name):
+ """Return specified resource as a string"""
+ return get_provider(package_or_requirement).get_resource_string(
+ self, resource_name
+ )
+
+ def resource_listdir(self, package_or_requirement, resource_name):
+ """List the contents of the named resource directory"""
+ return get_provider(package_or_requirement).resource_listdir(
+ resource_name
+ )
+
+ def extraction_error(self):
+ """Give an error message for problems extracting file(s)"""
+
+ old_exc = sys.exc_info()[1]
+ cache_path = self.extraction_path or get_default_cache()
+
+ err = ExtractionError("""Can't extract file(s) to egg cache
+
+The following error occurred while trying to extract file(s) to the Python egg
+cache:
+
+ %s
+
+The Python egg cache directory is currently set to:
+
+ %s
+
+Perhaps your account does not have write access to this directory? You can
+change the cache directory by setting the PYTHON_EGG_CACHE environment
+variable to point to an accessible directory.
+""" % (old_exc, cache_path)
+ )
+ err.manager = self
+ err.cache_path = cache_path
+ err.original_error = old_exc
+ raise err
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+ def get_cache_path(self, archive_name, names=()):
+ """Return absolute location in cache for `archive_name` and `names`
+
+ The parent directory of the resulting path will be created if it does
+ not already exist. `archive_name` should be the base filename of the
+ enclosing egg (which may not be the name of the enclosing zipfile!),
+ including its ".egg" extension. `names`, if provided, should be a
+ sequence of path name parts "under" the egg's extraction location.
+
+ This method should only be called by resource providers that need to
+ obtain an extraction location, and only for names they intend to
+ extract, as it tracks the generated names for possible cleanup later.
+ """
+ extract_path = self.extraction_path or get_default_cache()
+ target_path = os.path.join(extract_path, archive_name+'-tmp', *names)
+ try:
+ _bypass_ensure_directory(target_path)
+ except:
+ self.extraction_error()
+
+ self.cached_files[target_path] = 1
+ return target_path
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+ def postprocess(self, tempname, filename):
+ """Perform any platform-specific postprocessing of `tempname`
+
+ This is where Mac header rewrites should be done; other platforms don't
+ have anything special they should do.
+
+ Resource providers should call this method ONLY after successfully
+ extracting a compressed resource. They must NOT call it on resources
+ that are already in the filesystem.
+
+ `tempname` is the current (temporary) name of the file, and `filename`
+ is the name it will be renamed to by the caller after this routine
+ returns.
+ """
+
+ if os.name == 'posix':
+ # Make the resource executable
+ mode = ((os.stat(tempname).st_mode) | 0555) & 07777
+ os.chmod(tempname, mode)
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+ def set_extraction_path(self, path):
+ """Set the base path where resources will be extracted to, if needed.
+
+ If you do not call this routine before any extractions take place, the
+ path defaults to the return value of ``get_default_cache()``. (Which
+ is based on the ``PYTHON_EGG_CACHE`` environment variable, with various
+ platform-specific fallbacks. See that routine's documentation for more
+ details.)
+
+ Resources are extracted to subdirectories of this path based upon
+ information given by the ``IResourceProvider``. You may set this to a
+ temporary directory, but then you must call ``cleanup_resources()`` to
+ delete the extracted files when done. There is no guarantee that
+ ``cleanup_resources()`` will be able to remove all extracted files.
+
+ (Note: you may not change the extraction path for a given resource
+ manager once resources have been extracted, unless you first call
+ ``cleanup_resources()``.)
+ """
+ if self.cached_files:
+ raise ValueError(
+ "Can't change extraction path, files already extracted"
+ )
+
+ self.extraction_path = path
+
+ def cleanup_resources(self, force=False):
+ """
+ Delete all extracted resource files and directories, returning a list
+ of the file and directory names that could not be successfully removed.
+ This function does not have any concurrency protection, so it should
+ generally only be called when the extraction path is a temporary
+ directory exclusive to a single process. This method is not
+ automatically called; you must call it explicitly or register it as an
+ ``atexit`` function if you wish to ensure cleanup of a temporary
+ directory used for extractions.
+ """
+ # XXX
+
+
+
+def get_default_cache():
+ """Determine the default cache location
+
+ This returns the ``PYTHON_EGG_CACHE`` environment variable, if set.
+ Otherwise, on Windows, it returns a "Python-Eggs" subdirectory of the
+ "Application Data" directory. On all other systems, it's "~/.python-eggs".
+ """
+ try:
+ return os.environ['PYTHON_EGG_CACHE']
+ except KeyError:
+ pass
+
+ if os.name!='nt':
+ return os.path.expanduser('~/.python-eggs')
+
+ app_data = 'Application Data' # XXX this may be locale-specific!
+ app_homes = [
+ (('APPDATA',), None), # best option, should be locale-safe
+ (('USERPROFILE',), app_data),
+ (('HOMEDRIVE','HOMEPATH'), app_data),
+ (('HOMEPATH',), app_data),
+ (('HOME',), None),
+ (('WINDIR',), app_data), # 95/98/ME
+ ]
+
+ for keys, subdir in app_homes:
+ dirname = ''
+ for key in keys:
+ if key in os.environ:
+ dirname = os.path.join(dirname, os.environ[key])
+ else:
+ break
+ else:
+ if subdir:
+ dirname = os.path.join(dirname,subdir)
+ return os.path.join(dirname, 'Python-Eggs')
+ else:
+ raise RuntimeError(
+ "Please set the PYTHON_EGG_CACHE enviroment variable"
+ )
+
+def safe_name(name):
+ """Convert an arbitrary string to a standard distribution name
+
+ Any runs of non-alphanumeric/. characters are replaced with a single '-'.
+ """
+ return re.sub('[^A-Za-z0-9.]+', '-', name)
+
+
+def safe_version(version):
+ """Convert an arbitrary string to a standard version string
+
+ Spaces become dots, and all other non-alphanumeric characters become
+ dashes, with runs of multiple dashes condensed to a single dash.
+ """
+ version = version.replace(' ','.')
+ return re.sub('[^A-Za-z0-9.]+', '-', version)
+
+
+def safe_extra(extra):
+ """Convert an arbitrary string to a standard 'extra' name
+
+ Any runs of non-alphanumeric characters are replaced with a single '_',
+ and the result is always lowercased.
+ """
+ return re.sub('[^A-Za-z0-9.]+', '_', extra).lower()
+
+
+def to_filename(name):
+ """Convert a project or version name to its filename-escaped form
+
+ Any '-' characters are currently replaced with '_'.
+ """
+ return name.replace('-','_')
+
+
+
+
+
+
+
+
+class NullProvider:
+ """Try to implement resources and metadata for arbitrary PEP 302 loaders"""
+
+ egg_name = None
+ egg_info = None
+ loader = None
+
+ def __init__(self, module):
+ self.loader = getattr(module, '__loader__', None)
+ self.module_path = os.path.dirname(getattr(module, '__file__', ''))
+
+ def get_resource_filename(self, manager, resource_name):
+ return self._fn(self.module_path, resource_name)
+
+ def get_resource_stream(self, manager, resource_name):
+ return StringIO(self.get_resource_string(manager, resource_name))
+
+ def get_resource_string(self, manager, resource_name):
+ return self._get(self._fn(self.module_path, resource_name))
+
+ def has_resource(self, resource_name):
+ return self._has(self._fn(self.module_path, resource_name))
+
+ def has_metadata(self, name):
+ return self.egg_info and self._has(self._fn(self.egg_info,name))
+
+ def get_metadata(self, name):
+ if not self.egg_info:
+ return ""
+ return self._get(self._fn(self.egg_info,name))
+
+ def get_metadata_lines(self, name):
+ return yield_lines(self.get_metadata(name))
+
+ def resource_isdir(self,resource_name):
+ return self._isdir(self._fn(self.module_path, resource_name))
+
+ def metadata_isdir(self,name):
+ return self.egg_info and self._isdir(self._fn(self.egg_info,name))
+
+
+ def resource_listdir(self,resource_name):
+ return self._listdir(self._fn(self.module_path,resource_name))
+
+ def metadata_listdir(self,name):
+ if self.egg_info:
+ return self._listdir(self._fn(self.egg_info,name))
+ return []
+
+ def run_script(self,script_name,namespace):
+ script = 'scripts/'+script_name
+ if not self.has_metadata(script):
+ raise ResolutionError("No script named %r" % script_name)
+ script_text = self.get_metadata(script).replace('\r\n','\n')
+ script_text = script_text.replace('\r','\n')
+ script_filename = self._fn(self.egg_info,script)
+ namespace['__file__'] = script_filename
+ if os.path.exists(script_filename):
+ execfile(script_filename, namespace, namespace)
+ else:
+ from linecache import cache
+ cache[script_filename] = (
+ len(script_text), 0, script_text.split('\n'), script_filename
+ )
+ script_code = compile(script_text,script_filename,'exec')
+ exec script_code in namespace, namespace
+
+ def _has(self, path):
+ raise NotImplementedError(
+ "Can't perform this operation for unregistered loader type"
+ )
+
+ def _isdir(self, path):
+ raise NotImplementedError(
+ "Can't perform this operation for unregistered loader type"
+ )
+
+ def _listdir(self, path):
+ raise NotImplementedError(
+ "Can't perform this operation for unregistered loader type"
+ )
+
+ def _fn(self, base, resource_name):
+ if resource_name:
+ return os.path.join(base, *resource_name.split('/'))
+ return base
+
+ def _get(self, path):
+ if hasattr(self.loader, 'get_data'):
+ return self.loader.get_data(path)
+ raise NotImplementedError(
+ "Can't perform this operation for loaders without 'get_data()'"
+ )
+
+register_loader_type(object, NullProvider)
+
+
+class EggProvider(NullProvider):
+ """Provider based on a virtual filesystem"""
+
+ def __init__(self,module):
+ NullProvider.__init__(self,module)
+ self._setup_prefix()
+
+ def _setup_prefix(self):
+ # we assume here that our metadata may be nested inside a "basket"
+ # of multiple eggs; that's why we use module_path instead of .archive
+ path = self.module_path
+ old = None
+ while path!=old:
+ if path.lower().endswith('.egg'):
+ self.egg_name = os.path.basename(path)
+ self.egg_info = os.path.join(path, 'EGG-INFO')
+ self.egg_root = path
+ break
+ old = path
+ path, base = os.path.split(path)
+
+
+
+
+
+
+class DefaultProvider(EggProvider):
+ """Provides access to package resources in the filesystem"""
+
+ def _has(self, path):
+ return os.path.exists(path)
+
+ def _isdir(self,path):
+ return os.path.isdir(path)
+
+ def _listdir(self,path):
+ return os.listdir(path)
+
+ def get_resource_stream(self, manager, resource_name):
+ return open(self._fn(self.module_path, resource_name), 'rb')
+
+ def _get(self, path):
+ stream = open(path, 'rb')
+ try:
+ return stream.read()
+ finally:
+ stream.close()
+
+register_loader_type(type(None), DefaultProvider)
+
+
+class EmptyProvider(NullProvider):
+ """Provider that returns nothing for all requests"""
+
+ _isdir = _has = lambda self,path: False
+ _get = lambda self,path: ''
+ _listdir = lambda self,path: []
+ module_path = None
+
+ def __init__(self):
+ pass
+
+empty_provider = EmptyProvider()
+
+
+
+
+class ZipProvider(EggProvider):
+ """Resource support for zips and eggs"""
+
+ eagers = None
+
+ def __init__(self, module):
+ EggProvider.__init__(self,module)
+ self.zipinfo = zipimport._zip_directory_cache[self.loader.archive]
+ self.zip_pre = self.loader.archive+os.sep
+
+ def _zipinfo_name(self, fspath):
+ # Convert a virtual filename (full path to file) into a zipfile subpath
+ # usable with the zipimport directory cache for our target archive
+ if fspath.startswith(self.zip_pre):
+ return fspath[len(self.zip_pre):]
+ raise AssertionError(
+ "%s is not a subpath of %s" % (fspath,self.zip_pre)
+ )
+
+ def _parts(self,zip_path):
+ # Convert a zipfile subpath into an egg-relative path part list
+ fspath = self.zip_pre+zip_path # pseudo-fs path
+ if fspath.startswith(self.egg_root+os.sep):
+ return fspath[len(self.egg_root)+1:].split(os.sep)
+ raise AssertionError(
+ "%s is not a subpath of %s" % (fspath,self.egg_root)
+ )
+
+ def get_resource_filename(self, manager, resource_name):
+ if not self.egg_name:
+ raise NotImplementedError(
+ "resource_filename() only supported for .egg, not .zip"
+ )
+ # no need to lock for extraction, since we use temp names
+ zip_path = self._resource_to_zip(resource_name)
+ eagers = self._get_eager_resources()
+ if '/'.join(self._parts(zip_path)) in eagers:
+ for name in eagers:
+ self._extract_resource(manager, self._eager_to_zip(name))
+ return self._extract_resource(manager, zip_path)
+
+ def _extract_resource(self, manager, zip_path):
+
+ if zip_path in self._index():
+ for name in self._index()[zip_path]:
+ last = self._extract_resource(
+ manager, os.path.join(zip_path, name)
+ )
+ return os.path.dirname(last) # return the extracted directory name
+
+ zip_stat = self.zipinfo[zip_path]
+ t,d,size = zip_stat[5], zip_stat[6], zip_stat[3]
+ date_time = (
+ (d>>9)+1980, (d>>5)&0xF, d&0x1F, # ymd
+ (t&0xFFFF)>>11, (t>>5)&0x3F, (t&0x1F) * 2, 0, 0, -1 # hms, etc.
+ )
+ timestamp = time.mktime(date_time)
+
+ try:
+ real_path = manager.get_cache_path(
+ self.egg_name, self._parts(zip_path)
+ )
+
+ if os.path.isfile(real_path):
+ stat = os.stat(real_path)
+ if stat.st_size==size and stat.st_mtime==timestamp:
+ # size and stamp match, don't bother extracting
+ return real_path
+
+ outf, tmpnam = _mkstemp(".$extract", dir=os.path.dirname(real_path))
+ os.write(outf, self.loader.get_data(zip_path))
+ os.close(outf)
+ utime(tmpnam, (timestamp,timestamp))
+ manager.postprocess(tmpnam, real_path)
+
+ try:
+ rename(tmpnam, real_path)
+
+ except os.error:
+ if os.path.isfile(real_path):
+ stat = os.stat(real_path)
+
+ if stat.st_size==size and stat.st_mtime==timestamp:
+ # size and stamp match, somebody did it just ahead of
+ # us, so we're done
+ return real_path
+ elif os.name=='nt': # Windows, del old file and retry
+ unlink(real_path)
+ rename(tmpnam, real_path)
+ return real_path
+ raise
+
+ except os.error:
+ manager.extraction_error() # report a user-friendly error
+
+ return real_path
+
+ def _get_eager_resources(self):
+ if self.eagers is None:
+ eagers = []
+ for name in ('native_libs.txt', 'eager_resources.txt'):
+ if self.has_metadata(name):
+ eagers.extend(self.get_metadata_lines(name))
+ self.eagers = eagers
+ return self.eagers
+
+ def _index(self):
+ try:
+ return self._dirindex
+ except AttributeError:
+ ind = {}
+ for path in self.zipinfo:
+ parts = path.split(os.sep)
+ while parts:
+ parent = os.sep.join(parts[:-1])
+ if parent in ind:
+ ind[parent].append(parts[-1])
+ break
+ else:
+ ind[parent] = [parts.pop()]
+ self._dirindex = ind
+ return ind
+
+ def _has(self, fspath):
+ zip_path = self._zipinfo_name(fspath)
+ return zip_path in self.zipinfo or zip_path in self._index()
+
+ def _isdir(self,fspath):
+ return self._zipinfo_name(fspath) in self._index()
+
+ def _listdir(self,fspath):
+ return list(self._index().get(self._zipinfo_name(fspath), ()))
+
+ def _eager_to_zip(self,resource_name):
+ return self._zipinfo_name(self._fn(self.egg_root,resource_name))
+
+ def _resource_to_zip(self,resource_name):
+ return self._zipinfo_name(self._fn(self.module_path,resource_name))
+
+register_loader_type(zipimport.zipimporter, ZipProvider)
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+class FileMetadata(EmptyProvider):
+ """Metadata handler for standalone PKG-INFO files
+
+ Usage::
+
+ metadata = FileMetadata("/path/to/PKG-INFO")
+
+ This provider rejects all data and metadata requests except for PKG-INFO,
+ which is treated as existing, and will be the contents of the file at
+ the provided location.
+ """
+
+ def __init__(self,path):
+ self.path = path
+
+ def has_metadata(self,name):
+ return name=='PKG-INFO'
+
+ def get_metadata(self,name):
+ if name=='PKG-INFO':
+ return open(self.path,'rU').read()
+ raise KeyError("No metadata except PKG-INFO is available")
+
+ def get_metadata_lines(self,name):
+ return yield_lines(self.get_metadata(name))
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+class PathMetadata(DefaultProvider):
+ """Metadata provider for egg directories
+
+ Usage::
+
+ # Development eggs:
+
+ egg_info = "/path/to/PackageName.egg-info"
+ base_dir = os.path.dirname(egg_info)
+ metadata = PathMetadata(base_dir, egg_info)
+ dist_name = os.path.splitext(os.path.basename(egg_info))[0]
+ dist = Distribution(basedir,project_name=dist_name,metadata=metadata)
+
+ # Unpacked egg directories:
+
+ egg_path = "/path/to/PackageName-ver-pyver-etc.egg"
+ metadata = PathMetadata(egg_path, os.path.join(egg_path,'EGG-INFO'))
+ dist = Distribution.from_filename(egg_path, metadata=metadata)
+ """
+
+ def __init__(self, path, egg_info):
+ self.module_path = path
+ self.egg_info = egg_info
+
+
+class EggMetadata(ZipProvider):
+ """Metadata provider for .egg files"""
+
+ def __init__(self, importer):
+ """Create a metadata provider from a zipimporter"""
+
+ self.zipinfo = zipimport._zip_directory_cache[importer.archive]
+ self.zip_pre = importer.archive+os.sep
+ self.loader = importer
+ if importer.prefix:
+ self.module_path = os.path.join(importer.archive, importer.prefix)
+ else:
+ self.module_path = importer.archive
+ self._setup_prefix()
+
+
+class ImpWrapper:
+ """PEP 302 Importer that wraps Python's "normal" import algorithm"""
+
+ def __init__(self, path=None):
+ self.path = path
+
+ def find_module(self, fullname, path=None):
+ subname = fullname.split(".")[-1]
+ if subname != fullname and self.path is None:
+ return None
+ if self.path is None:
+ path = None
+ else:
+ path = [self.path]
+ try:
+ file, filename, etc = imp.find_module(subname, path)
+ except ImportError:
+ return None
+ return ImpLoader(file, filename, etc)
+
+
+class ImpLoader:
+ """PEP 302 Loader that wraps Python's "normal" import algorithm"""
+
+ def __init__(self, file, filename, etc):
+ self.file = file
+ self.filename = filename
+ self.etc = etc
+
+ def load_module(self, fullname):
+ try:
+ mod = imp.load_module(fullname, self.file, self.filename, self.etc)
+ finally:
+ if self.file: self.file.close()
+ # Note: we don't set __loader__ because we want the module to look
+ # normal; i.e. this is just a wrapper for standard import machinery
+ return mod
+
+
+
+
+def get_importer(path_item):
+ """Retrieve a PEP 302 "importer" for the given path item
+
+ If there is no importer, this returns a wrapper around the builtin import
+ machinery. The returned importer is only cached if it was created by a
+ path hook.
+ """
+ try:
+ importer = sys.path_importer_cache[path_item]
+ except KeyError:
+ for hook in sys.path_hooks:
+ try:
+ importer = hook(path_item)
+ except ImportError:
+ pass
+ else:
+ break
+ else:
+ importer = None
+
+ sys.path_importer_cache.setdefault(path_item,importer)
+ if importer is None:
+ try:
+ importer = ImpWrapper(path_item)
+ except ImportError:
+ pass
+ return importer
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+_declare_state('dict', _distribution_finders = {})
+
+def register_finder(importer_type, distribution_finder):
+ """Register `distribution_finder` to find distributions in sys.path items
+
+ `importer_type` is the type or class of a PEP 302 "Importer" (sys.path item
+ handler), and `distribution_finder` is a callable that, passed a path
+ item and the importer instance, yields ``Distribution`` instances found on
+ that path item. See ``pkg_resources.find_on_path`` for an example."""
+ _distribution_finders[importer_type] = distribution_finder
+
+
+def find_distributions(path_item, only=False):
+ """Yield distributions accessible via `path_item`"""
+ importer = get_importer(path_item)
+ finder = _find_adapter(_distribution_finders, importer)
+ return finder(importer, path_item, only)
+
+def find_in_zip(importer, path_item, only=False):
+ metadata = EggMetadata(importer)
+ if metadata.has_metadata('PKG-INFO'):
+ yield Distribution.from_filename(path_item, metadata=metadata)
+ if only:
+ return # don't yield nested distros
+ for subitem in metadata.resource_listdir('/'):
+ if subitem.endswith('.egg'):
+ subpath = os.path.join(path_item, subitem)
+ for dist in find_in_zip(zipimport.zipimporter(subpath), subpath):
+ yield dist
+
+register_finder(zipimport.zipimporter, find_in_zip)
+
+def StringIO(*args, **kw):
+ """Thunk to load the real StringIO on demand"""
+ global StringIO
+ try:
+ from cStringIO import StringIO
+ except ImportError:
+ from StringIO import StringIO
+ return StringIO(*args,**kw)
+
+def find_nothing(importer, path_item, only=False):
+ return ()
+register_finder(object,find_nothing)
+
+def find_on_path(importer, path_item, only=False):
+ """Yield distributions accessible on a sys.path directory"""
+ path_item = _normalize_cached(path_item)
+
+ if os.path.isdir(path_item) and os.access(path_item, os.R_OK):
+ if path_item.lower().endswith('.egg'):
+ # unpacked egg
+ yield Distribution.from_filename(
+ path_item, metadata=PathMetadata(
+ path_item, os.path.join(path_item,'EGG-INFO')
+ )
+ )
+ else:
+ # scan for .egg and .egg-info in directory
+ for entry in os.listdir(path_item):
+ lower = entry.lower()
+ if lower.endswith('.egg-info'):
+ fullpath = os.path.join(path_item, entry)
+ if os.path.isdir(fullpath):
+ # egg-info directory, allow getting metadata
+ metadata = PathMetadata(path_item, fullpath)
+ else:
+ metadata = FileMetadata(fullpath)
+ yield Distribution.from_location(
+ path_item,entry,metadata,precedence=DEVELOP_DIST
+ )
+ elif not only and lower.endswith('.egg'):
+ for dist in find_distributions(os.path.join(path_item, entry)):
+ yield dist
+ elif not only and lower.endswith('.egg-link'):
+ for line in file(os.path.join(path_item, entry)):
+ if not line.strip(): continue
+ for item in find_distributions(os.path.join(path_item,line.rstrip())):
+ yield item
+ break
+register_finder(ImpWrapper, find_on_path)
+
+_declare_state('dict', _namespace_handlers = {})
+_declare_state('dict', _namespace_packages = {})
+
+def register_namespace_handler(importer_type, namespace_handler):
+ """Register `namespace_handler` to declare namespace packages
+
+ `importer_type` is the type or class of a PEP 302 "Importer" (sys.path item
+ handler), and `namespace_handler` is a callable like this::
+
+ def namespace_handler(importer,path_entry,moduleName,module):
+ # return a path_entry to use for child packages
+
+ Namespace handlers are only called if the importer object has already
+ agreed that it can handle the relevant path item, and they should only
+ return a subpath if the module __path__ does not already contain an
+ equivalent subpath. For an example namespace handler, see
+ ``pkg_resources.file_ns_handler``.
+ """
+ _namespace_handlers[importer_type] = namespace_handler
+
+def _handle_ns(packageName, path_item):
+ """Ensure that named package includes a subpath of path_item (if needed)"""
+ importer = get_importer(path_item)
+ if importer is None:
+ return None
+ loader = importer.find_module(packageName)
+ if loader is None:
+ return None
+ module = sys.modules.get(packageName)
+ if module is None:
+ module = sys.modules[packageName] = imp.new_module(packageName)
+ module.__path__ = []; _set_parent_ns(packageName)
+ elif not hasattr(module,'__path__'):
+ raise TypeError("Not a package:", packageName)
+ handler = _find_adapter(_namespace_handlers, importer)
+ subpath = handler(importer,path_item,packageName,module)
+ if subpath is not None:
+ path = module.__path__; path.append(subpath)
+ loader.load_module(packageName); module.__path__ = path
+ return subpath
+
+def declare_namespace(packageName):
+ """Declare that package 'packageName' is a namespace package"""
+
+ imp.acquire_lock()
+ try:
+ if packageName in _namespace_packages:
+ return
+
+ path, parent = sys.path, None
+ if '.' in packageName:
+ parent = '.'.join(packageName.split('.')[:-1])
+ declare_namespace(parent)
+ __import__(parent)
+ try:
+ path = sys.modules[parent].__path__
+ except AttributeError:
+ raise TypeError("Not a package:", parent)
+
+ # Track what packages are namespaces, so when new path items are added,
+ # they can be updated
+ _namespace_packages.setdefault(parent,[]).append(packageName)
+ _namespace_packages.setdefault(packageName,[])
+
+ for path_item in path:
+ # Ensure all the parent's path items are reflected in the child,
+ # if they apply
+ _handle_ns(packageName, path_item)
+
+ finally:
+ imp.release_lock()
+
+def fixup_namespace_packages(path_item, parent=None):
+ """Ensure that previously-declared namespace packages include path_item"""
+ imp.acquire_lock()
+ try:
+ for package in _namespace_packages.get(parent,()):
+ subpath = _handle_ns(package, path_item)
+ if subpath: fixup_namespace_packages(subpath,package)
+ finally:
+ imp.release_lock()
+
+def file_ns_handler(importer, path_item, packageName, module):
+ """Compute an ns-package subpath for a filesystem or zipfile importer"""
+
+ subpath = os.path.join(path_item, packageName.split('.')[-1])
+ normalized = _normalize_cached(subpath)
+ for item in module.__path__:
+ if _normalize_cached(item)==normalized:
+ break
+ else:
+ # Only return the path if it's not already there
+ return subpath
+
+register_namespace_handler(ImpWrapper,file_ns_handler)
+register_namespace_handler(zipimport.zipimporter,file_ns_handler)
+
+
+def null_ns_handler(importer, path_item, packageName, module):
+ return None
+
+register_namespace_handler(object,null_ns_handler)
+
+
+def normalize_path(filename):
+ """Normalize a file/dir name for comparison purposes"""
+ return os.path.normcase(os.path.realpath(filename))
+
+def _normalize_cached(filename,_cache={}):
+ try:
+ return _cache[filename]
+ except KeyError:
+ _cache[filename] = result = normalize_path(filename)
+ return result
+
+def _set_parent_ns(packageName):
+ parts = packageName.split('.')
+ name = parts.pop()
+ if parts:
+ parent = '.'.join(parts)
+ setattr(sys.modules[parent], name, sys.modules[packageName])
+
+
+def yield_lines(strs):
+ """Yield non-empty/non-comment lines of a ``basestring`` or sequence"""
+ if isinstance(strs,basestring):
+ for s in strs.splitlines():
+ s = s.strip()
+ if s and not s.startswith('#'): # skip blank lines/comments
+ yield s
+ else:
+ for ss in strs:
+ for s in yield_lines(ss):
+ yield s
+
+LINE_END = re.compile(r"\s*(#.*)?$").match # whitespace and comment
+CONTINUE = re.compile(r"\s*\\\s*(#.*)?$").match # line continuation
+DISTRO = re.compile(r"\s*((\w|[-.])+)").match # Distribution or extra
+VERSION = re.compile(r"\s*(<=?|>=?|==|!=)\s*((\w|[-.])+)").match # ver. info
+COMMA = re.compile(r"\s*,").match # comma between items
+OBRACKET = re.compile(r"\s*\[").match
+CBRACKET = re.compile(r"\s*\]").match
+MODULE = re.compile(r"\w+(\.\w+)*$").match
+EGG_NAME = re.compile(
+ r"(?P<name>[^-]+)"
+ r"( -(?P<ver>[^-]+) (-py(?P<pyver>[^-]+) (-(?P<plat>.+))? )? )?",
+ re.VERBOSE | re.IGNORECASE
+).match
+
+component_re = re.compile(r'(\d+ | [a-z]+ | \.| -)', re.VERBOSE)
+replace = {'pre':'c', 'preview':'c','-':'final-','rc':'c','dev':'@'}.get
+
+def _parse_version_parts(s):
+ for part in component_re.split(s):
+ part = replace(part,part)
+ if not part or part=='.':
+ continue
+ if part[:1] in '0123456789':
+ yield part.zfill(8) # pad for numeric comparison
+ else:
+ yield '*'+part
+
+ yield '*final' # ensure that alpha/beta/candidate are before final
+
+def parse_version(s):
+ """Convert a version string to a chronologically-sortable key
+
+ This is a rough cross between distutils' StrictVersion and LooseVersion;
+ if you give it versions that would work with StrictVersion, then it behaves
+ the same; otherwise it acts like a slightly-smarter LooseVersion. It is
+ *possible* to create pathological version coding schemes that will fool
+ this parser, but they should be very rare in practice.
+
+ The returned value will be a tuple of strings. Numeric portions of the
+ version are padded to 8 digits so they will compare numerically, but
+ without relying on how numbers compare relative to strings. Dots are
+ dropped, but dashes are retained. Trailing zeros between alpha segments
+ or dashes are suppressed, so that e.g. "2.4.0" is considered the same as
+ "2.4". Alphanumeric parts are lower-cased.
+
+ The algorithm assumes that strings like "-" and any alpha string that
+ alphabetically follows "final" represents a "patch level". So, "2.4-1"
+ is assumed to be a branch or patch of "2.4", and therefore "2.4.1" is
+ considered newer than "2.4-1", which in turn is newer than "2.4".
+
+ Strings like "a", "b", "c", "alpha", "beta", "candidate" and so on (that
+ come before "final" alphabetically) are assumed to be pre-release versions,
+ so that the version "2.4" is considered newer than "2.4a1".
+
+ Finally, to handle miscellaneous cases, the strings "pre", "preview", and
+ "rc" are treated as if they were "c", i.e. as though they were release
+ candidates, and therefore are not as new as a version string that does not
+ contain them, and "dev" is replaced with an '@' so that it sorts lower than
+ than any other pre-release tag.
+ """
+ parts = []
+ for part in _parse_version_parts(s.lower()):
+ if part.startswith('*'):
+ if part<'*final': # remove '-' before a prerelease tag
+ while parts and parts[-1]=='*final-': parts.pop()
+ # remove trailing zeros from each series of numeric parts
+ while parts and parts[-1]=='00000000':
+ parts.pop()
+ parts.append(part)
+ return tuple(parts)
+
+class EntryPoint(object):
+ """Object representing an advertised importable object"""
+
+ def __init__(self, name, module_name, attrs=(), extras=(), dist=None):
+ if not MODULE(module_name):
+ raise ValueError("Invalid module name", module_name)
+ self.name = name
+ self.module_name = module_name
+ self.attrs = tuple(attrs)
+ self.extras = Requirement.parse(("x[%s]" % ','.join(extras))).extras
+ self.dist = dist
+
+ def __str__(self):
+ s = "%s = %s" % (self.name, self.module_name)
+ if self.attrs:
+ s += ':' + '.'.join(self.attrs)
+ if self.extras:
+ s += ' [%s]' % ','.join(self.extras)
+ return s
+
+ def __repr__(self):
+ return "EntryPoint.parse(%r)" % str(self)
+
+ def load(self, require=True, env=None, installer=None):
+ if require: self.require(env, installer)
+ entry = __import__(self.module_name, globals(),globals(), ['__name__'])
+ for attr in self.attrs:
+ try:
+ entry = getattr(entry,attr)
+ except AttributeError:
+ raise ImportError("%r has no %r attribute" % (entry,attr))
+ return entry
+
+ def require(self, env=None, installer=None):
+ if self.extras and not self.dist:
+ raise UnknownExtra("Can't require() without a distribution", self)
+ map(working_set.add,
+ working_set.resolve(self.dist.requires(self.extras),env,installer))
+
+
+
+ #@classmethod
+ def parse(cls, src, dist=None):
+ """Parse a single entry point from string `src`
+
+ Entry point syntax follows the form::
+
+ name = some.module:some.attr [extra1,extra2]
+
+ The entry name and module name are required, but the ``:attrs`` and
+ ``[extras]`` parts are optional
+ """
+ try:
+ attrs = extras = ()
+ name,value = src.split('=',1)
+ if '[' in value:
+ value,extras = value.split('[',1)
+ req = Requirement.parse("x["+extras)
+ if req.specs: raise ValueError
+ extras = req.extras
+ if ':' in value:
+ value,attrs = value.split(':',1)
+ if not MODULE(attrs.rstrip()):
+ raise ValueError
+ attrs = attrs.rstrip().split('.')
+ except ValueError:
+ raise ValueError(
+ "EntryPoint must be in 'name=module:attrs [extras]' format",
+ src
+ )
+ else:
+ return cls(name.strip(), value.strip(), attrs, extras, dist)
+
+ parse = classmethod(parse)
+
+
+
+
+
+
+
+
+ #@classmethod
+ def parse_group(cls, group, lines, dist=None):
+ """Parse an entry point group"""
+ if not MODULE(group):
+ raise ValueError("Invalid group name", group)
+ this = {}
+ for line in yield_lines(lines):
+ ep = cls.parse(line, dist)
+ if ep.name in this:
+ raise ValueError("Duplicate entry point", group, ep.name)
+ this[ep.name]=ep
+ return this
+
+ parse_group = classmethod(parse_group)
+
+ #@classmethod
+ def parse_map(cls, data, dist=None):
+ """Parse a map of entry point groups"""
+ if isinstance(data,dict):
+ data = data.items()
+ else:
+ data = split_sections(data)
+ maps = {}
+ for group, lines in data:
+ if group is None:
+ if not lines:
+ continue
+ raise ValueError("Entry points must be listed in groups")
+ group = group.strip()
+ if group in maps:
+ raise ValueError("Duplicate group name", group)
+ maps[group] = cls.parse_group(group, lines, dist)
+ return maps
+
+ parse_map = classmethod(parse_map)
+
+
+
+
+
+
+class Distribution(object):
+ """Wrap an actual or potential sys.path entry w/metadata"""
+ def __init__(self,
+ location=None, metadata=None, project_name=None, version=None,
+ py_version=PY_MAJOR, platform=None, precedence = EGG_DIST
+ ):
+ self.project_name = safe_name(project_name or 'Unknown')
+ if version is not None:
+ self._version = safe_version(version)
+ self.py_version = py_version
+ self.platform = platform
+ self.location = location
+ self.precedence = precedence
+ self._provider = metadata or empty_provider
+
+ #@classmethod
+ def from_location(cls,location,basename,metadata=None,**kw):
+ project_name, version, py_version, platform = [None]*4
+ basename, ext = os.path.splitext(basename)
+ if ext.lower() in (".egg",".egg-info"):
+ match = EGG_NAME(basename)
+ if match:
+ project_name, version, py_version, platform = match.group(
+ 'name','ver','pyver','plat'
+ )
+ return cls(
+ location, metadata, project_name=project_name, version=version,
+ py_version=py_version, platform=platform, **kw
+ )
+ from_location = classmethod(from_location)
+
+ hashcmp = property(
+ lambda self: (
+ getattr(self,'parsed_version',()), self.precedence, self.key,
+ -len(self.location or ''), self.location, self.py_version,
+ self.platform
+ )
+ )
+ def __cmp__(self, other): return cmp(self.hashcmp, other)
+ def __hash__(self): return hash(self.hashcmp)
+
+ # These properties have to be lazy so that we don't have to load any
+ # metadata until/unless it's actually needed. (i.e., some distributions
+ # may not know their name or version without loading PKG-INFO)
+
+ #@property
+ def key(self):
+ try:
+ return self._key
+ except AttributeError:
+ self._key = key = self.project_name.lower()
+ return key
+ key = property(key)
+
+ #@property
+ def parsed_version(self):
+ try:
+ return self._parsed_version
+ except AttributeError:
+ self._parsed_version = pv = parse_version(self.version)
+ return pv
+
+ parsed_version = property(parsed_version)
+
+ #@property
+ def version(self):
+ try:
+ return self._version
+ except AttributeError:
+ for line in self._get_metadata('PKG-INFO'):
+ if line.lower().startswith('version:'):
+ self._version = safe_version(line.split(':',1)[1].strip())
+ return self._version
+ else:
+ raise ValueError(
+ "Missing 'Version:' header and/or PKG-INFO file", self
+ )
+ version = property(version)
+
+
+
+
+ #@property
+ def _dep_map(self):
+ try:
+ return self.__dep_map
+ except AttributeError:
+ dm = self.__dep_map = {None: []}
+ for name in 'requires.txt', 'depends.txt':
+ for extra,reqs in split_sections(self._get_metadata(name)):
+ if extra: extra = safe_extra(extra)
+ dm.setdefault(extra,[]).extend(parse_requirements(reqs))
+ return dm
+ _dep_map = property(_dep_map)
+
+ def requires(self,extras=()):
+ """List of Requirements needed for this distro if `extras` are used"""
+ dm = self._dep_map
+ deps = []
+ deps.extend(dm.get(None,()))
+ for ext in extras:
+ try:
+ deps.extend(dm[safe_extra(ext)])
+ except KeyError:
+ raise UnknownExtra(
+ "%s has no such extra feature %r" % (self, ext)
+ )
+ return deps
+
+ def _get_metadata(self,name):
+ if self.has_metadata(name):
+ for line in self.get_metadata_lines(name):
+ yield line
+
+ def activate(self,path=None):
+ """Ensure distribution is importable on `path` (default=sys.path)"""
+ if path is None: path = sys.path
+ self.insert_on(path)
+ if path is sys.path:
+ fixup_namespace_packages(self.location)
+ for pkg in self._get_metadata('namespace_packages.txt'):
+ if pkg in sys.modules: declare_namespace(pkg)
+
+ def egg_name(self):
+ """Return what this distribution's standard .egg filename should be"""
+ filename = "%s-%s-py%s" % (
+ to_filename(self.project_name), to_filename(self.version),
+ self.py_version or PY_MAJOR
+ )
+
+ if self.platform:
+ filename += '-'+self.platform
+ return filename
+
+ def __repr__(self):
+ if self.location:
+ return "%s (%s)" % (self,self.location)
+ else:
+ return str(self)
+
+ def __str__(self):
+ try: version = getattr(self,'version',None)
+ except ValueError: version = None
+ version = version or "[unknown version]"
+ return "%s %s" % (self.project_name,version)
+
+ def __getattr__(self,attr):
+ """Delegate all unrecognized public attributes to .metadata provider"""
+ if attr.startswith('_'):
+ raise AttributeError,attr
+ return getattr(self._provider, attr)
+
+ #@classmethod
+ def from_filename(cls,filename,metadata=None, **kw):
+ return cls.from_location(
+ _normalize_cached(filename), os.path.basename(filename), metadata,
+ **kw
+ )
+ from_filename = classmethod(from_filename)
+
+ def as_requirement(self):
+ """Return a ``Requirement`` that matches this distribution exactly"""
+ return Requirement.parse('%s==%s' % (self.project_name, self.version))
+
+ def load_entry_point(self, group, name):
+ """Return the `name` entry point of `group` or raise ImportError"""
+ ep = self.get_entry_info(group,name)
+ if ep is None:
+ raise ImportError("Entry point %r not found" % ((group,name),))
+ return ep.load()
+
+ def get_entry_map(self, group=None):
+ """Return the entry point map for `group`, or the full entry map"""
+ try:
+ ep_map = self._ep_map
+ except AttributeError:
+ ep_map = self._ep_map = EntryPoint.parse_map(
+ self._get_metadata('entry_points.txt'), self
+ )
+ if group is not None:
+ return ep_map.get(group,{})
+ return ep_map
+
+ def get_entry_info(self, group, name):
+ """Return the EntryPoint object for `group`+`name`, or ``None``"""
+ return self.get_entry_map(group).get(name)
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+ def insert_on(self, path, loc = None):
+ """Insert self.location in path before its nearest parent directory"""
+
+ loc = loc or self.location
+ if not loc:
+ return
+
+ nloc = _normalize_cached(loc)
+ bdir = os.path.dirname(nloc)
+ npath= [(p and _normalize_cached(p) or p) for p in path]
+
+ bp = None
+ for p, item in enumerate(npath):
+ if item==nloc:
+ break
+ elif item==bdir and self.precedence==EGG_DIST:
+ # if it's an .egg, give it precedence over its directory
+ if path is sys.path:
+ self.check_version_conflict()
+ path.insert(p, loc)
+ npath.insert(p, nloc)
+ break
+ else:
+ if path is sys.path:
+ self.check_version_conflict()
+ path.append(loc)
+ return
+
+ # p is the spot where we found or inserted loc; now remove duplicates
+ while 1:
+ try:
+ np = npath.index(nloc, p+1)
+ except ValueError:
+ break
+ else:
+ del npath[np], path[np]
+ p = np # ha!
+
+ return
+
+
+ def check_version_conflict(self):
+ if self.key=='setuptools':
+ return # ignore the inevitable setuptools self-conflicts :(
+
+ nsp = dict.fromkeys(self._get_metadata('namespace_packages.txt'))
+ loc = normalize_path(self.location)
+ for modname in self._get_metadata('top_level.txt'):
+ if (modname not in sys.modules or modname in nsp
+ or modname in _namespace_packages
+ ):
+ continue
+
+ fn = getattr(sys.modules[modname], '__file__', None)
+ if fn and (normalize_path(fn).startswith(loc) or fn.startswith(loc)):
+ continue
+ issue_warning(
+ "Module %s was already imported from %s, but %s is being added"
+ " to sys.path" % (modname, fn, self.location),
+ )
+
+ def has_version(self):
+ try:
+ self.version
+ except ValueError:
+ issue_warning("Unbuilt egg for "+repr(self))
+ return False
+ return True
+
+ def clone(self,**kw):
+ """Copy this distribution, substituting in any changed keyword args"""
+ for attr in (
+ 'project_name', 'version', 'py_version', 'platform', 'location',
+ 'precedence'
+ ):
+ kw.setdefault(attr, getattr(self,attr,None))
+ kw.setdefault('metadata', self._provider)
+ return self.__class__(**kw)
+
+
+
+
+ #@property
+ def extras(self):
+ return [dep for dep in self._dep_map if dep]
+ extras = property(extras)
+
+
+def issue_warning(*args,**kw):
+ level = 1
+ g = globals()
+ try:
+ # find the first stack frame that is *not* code in
+ # the pkg_resources module, to use for the warning
+ while sys._getframe(level).f_globals is g:
+ level += 1
+ except ValueError:
+ pass
+ from warnings import warn
+ warn(stacklevel = level+1, *args, **kw)
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+def parse_requirements(strs):
+ """Yield ``Requirement`` objects for each specification in `strs`
+
+ `strs` must be an instance of ``basestring``, or a (possibly-nested)
+ iterable thereof.
+ """
+ # create a steppable iterator, so we can handle \-continuations
+ lines = iter(yield_lines(strs))
+
+ def scan_list(ITEM,TERMINATOR,line,p,groups,item_name):
+
+ items = []
+
+ while not TERMINATOR(line,p):
+ if CONTINUE(line,p):
+ try:
+ line = lines.next(); p = 0
+ except StopIteration:
+ raise ValueError(
+ "\\ must not appear on the last nonblank line"
+ )
+
+ match = ITEM(line,p)
+ if not match:
+ raise ValueError("Expected "+item_name+" in",line,"at",line[p:])
+
+ items.append(match.group(*groups))
+ p = match.end()
+
+ match = COMMA(line,p)
+ if match:
+ p = match.end() # skip the comma
+ elif not TERMINATOR(line,p):
+ raise ValueError(
+ "Expected ',' or end-of-list in",line,"at",line[p:]
+ )
+
+ match = TERMINATOR(line,p)
+ if match: p = match.end() # skip the terminator, if any
+ return line, p, items
+
+ for line in lines:
+ match = DISTRO(line)
+ if not match:
+ raise ValueError("Missing distribution spec", line)
+ project_name = match.group(1)
+ p = match.end()
+ extras = []
+
+ match = OBRACKET(line,p)
+ if match:
+ p = match.end()
+ line, p, extras = scan_list(
+ DISTRO, CBRACKET, line, p, (1,), "'extra' name"
+ )
+
+ line, p, specs = scan_list(VERSION,LINE_END,line,p,(1,2),"version spec")
+ specs = [(op,safe_version(val)) for op,val in specs]
+ yield Requirement(project_name, specs, extras)
+
+
+def _sort_dists(dists):
+ tmp = [(dist.hashcmp,dist) for dist in dists]
+ tmp.sort()
+ dists[::-1] = [d for hc,d in tmp]
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+class Requirement:
+ def __init__(self, project_name, specs, extras):
+ """DO NOT CALL THIS UNDOCUMENTED METHOD; use Requirement.parse()!"""
+ self.unsafe_name, project_name = project_name, safe_name(project_name)
+ self.project_name, self.key = project_name, project_name.lower()
+ index = [(parse_version(v),state_machine[op],op,v) for op,v in specs]
+ index.sort()
+ self.specs = [(op,ver) for parsed,trans,op,ver in index]
+ self.index, self.extras = index, tuple(map(safe_extra,extras))
+ self.hashCmp = (
+ self.key, tuple([(op,parsed) for parsed,trans,op,ver in index]),
+ frozenset(self.extras)
+ )
+ self.__hash = hash(self.hashCmp)
+
+ def __str__(self):
+ specs = ','.join([''.join(s) for s in self.specs])
+ extras = ','.join(self.extras)
+ if extras: extras = '[%s]' % extras
+ return '%s%s%s' % (self.project_name, extras, specs)
+
+ def __eq__(self,other):
+ return isinstance(other,Requirement) and self.hashCmp==other.hashCmp
+
+ def __contains__(self,item):
+ if isinstance(item,Distribution):
+ if item.key != self.key: return False
+ if self.index: item = item.parsed_version # only get if we need it
+ elif isinstance(item,basestring):
+ item = parse_version(item)
+ last = None
+ for parsed,trans,op,ver in self.index:
+ action = trans[cmp(item,parsed)]
+ if action=='F': return False
+ elif action=='T': return True
+ elif action=='+': last = True
+ elif action=='-' or last is None: last = False
+ if last is None: last = True # no rules encountered
+ return last
+
+
+ def __hash__(self):
+ return self.__hash
+
+ def __repr__(self): return "Requirement.parse(%r)" % str(self)
+
+ #@staticmethod
+ def parse(s):
+ reqs = list(parse_requirements(s))
+ if reqs:
+ if len(reqs)==1:
+ return reqs[0]
+ raise ValueError("Expected only one requirement", s)
+ raise ValueError("No requirements found", s)
+
+ parse = staticmethod(parse)
+
+state_machine = {
+ # =><
+ '<' : '--T',
+ '<=': 'T-T',
+ '>' : 'F+F',
+ '>=': 'T+F',
+ '==': 'T..',
+ '!=': 'F++',
+}
+
+
+def _get_mro(cls):
+ """Get an mro for a type or classic class"""
+ if not isinstance(cls,type):
+ class cls(cls,object): pass
+ return cls.__mro__[1:]
+ return cls.__mro__
+
+def _find_adapter(registry, ob):
+ """Return an adapter factory for `ob` from `registry`"""
+ for t in _get_mro(getattr(ob, '__class__', type(ob))):
+ if t in registry:
+ return registry[t]
+
+
+def ensure_directory(path):
+ """Ensure that the parent directory of `path` exists"""
+ dirname = os.path.dirname(path)
+ if not os.path.isdir(dirname):
+ os.makedirs(dirname)
+
+def split_sections(s):
+ """Split a string or iterable thereof into (section,content) pairs
+
+ Each ``section`` is a stripped version of the section header ("[section]")
+ and each ``content`` is a list of stripped lines excluding blank lines and
+ comment-only lines. If there are any such lines before the first section
+ header, they're returned in a first ``section`` of ``None``.
+ """
+ section = None
+ content = []
+ for line in yield_lines(s):
+ if line.startswith("["):
+ if line.endswith("]"):
+ if section or content:
+ yield section, content
+ section = line[1:-1].strip()
+ content = []
+ else:
+ raise ValueError("Invalid section heading", line)
+ else:
+ content.append(line)
+
+ # wrap up last segment
+ yield section, content
+
+def _mkstemp(*args,**kw):
+ from tempfile import mkstemp
+ old_open = os.open
+ try:
+ os.open = os_open # temporarily bypass sandboxing
+ return mkstemp(*args,**kw)
+ finally:
+ os.open = old_open # and then put it back
+
+
+# Set up global resource manager (deliberately not state-saved)
+_manager = ResourceManager()
+def _initialize(g):
+ for name in dir(_manager):
+ if not name.startswith('_'):
+ g[name] = getattr(_manager, name)
+_initialize(globals())
+
+# Prepare the master working set and make the ``require()`` API available
+__requires__ = None
+_declare_state('object', working_set = WorkingSet())
+try:
+ # Does the main program list any requirements?
+ from __main__ import __requires__
+except ImportError:
+ pass # No: just use the default working set based on sys.path
+else:
+ # Yes: ensure the requirements are met, by prefixing sys.path if necessary
+ try:
+ working_set.require(__requires__)
+ except (VersionConflict, DistributionNotFound): # try it without defaults already on sys.path
+ working_set = WorkingSet([]) # by starting with an empty path
+ try:
+ for dist in working_set.resolve(
+ parse_requirements(__requires__), Environment()
+ ):
+ working_set.add(dist)
+ except DistributionNotFound:
+ pass
+ for entry in sys.path: # add any missing entries from sys.path
+ if entry not in working_set.entries:
+ working_set.add_entry(entry)
+ sys.path[:] = working_set.entries # then copy back to sys.path
+
+require = working_set.require
+iter_entry_points = working_set.iter_entry_points
+add_activation_listener = working_set.subscribe
+run_script = working_set.run_script
+run_main = run_script # backward compatibility
+# Activate all distributions already on sys.path, and ensure that
+# all distributions added to the working set in the future (e.g. by
+# calling ``require()``) will get activated as well.
+add_activation_listener(lambda dist: dist.activate())
+working_set.entries=[]; map(working_set.add_entry,sys.path) # match order
+
projects / tahoe-lafs / zfec.git / commitdiff