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Diffstat (limited to 'Lib/pkg_resources.py')
| -rw-r--r-- | Lib/pkg_resources.py | 2377 |
1 files changed, 2377 insertions, 0 deletions
diff --git a/Lib/pkg_resources.py b/Lib/pkg_resources.py new file mode 100644 index 0000000..db6cc90 --- /dev/null +++ b/Lib/pkg_resources.py @@ -0,0 +1,2377 @@ +"""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, new, pkgutil # XXX +from sets import ImmutableSet +from os import utime, rename, unlink # capture these to bypass sandboxing +from os import open as os_open + +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: + info = os.popen('/usr/bin/sw_vers').read().splitlines() + for line in info: + key, value = line.split(None, 1) + if key == 'ProductVersion:': + _cache.append(value.strip().split(".")) + break + else: + raise ValueError, "What?!" + 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) + + +try: + from pkgutil import get_importer +except ImportError: + import _pkgutil as pkgutil + get_importer = pkgutil.get_importer +else: + import pkgutil + + +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,False)`` 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,[]) + + if dist.key in self.by_key: + return # ignore hidden distros + + self.by_key[dist.key] = dist + if dist.key not in keys: + keys.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) + + + + + + + + + + + +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 distribution in the + environment that meets the ``Requirement`` in `req`. If no suitable + distribution is found, and `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 + 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: + 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. + """ + # XXX + + + 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(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): + return os.path.join(base, *resource_name.split('/')) + + 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() + + + +_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): + 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(line.rstrip()): + yield item + +register_finder(pkgutil.ImpImporter, find_on_path) + +_namespace_handlers = {} +_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] = 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(pkgutil.ImpImporter, 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'}.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", whic 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. + """ + 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.lstrip(), 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 + if path is sys.path: + self.check_version_conflict() + best, pos = 0, -1 + for p,item in enumerate(path): + item = _normalize_cached(item) + if loc.startswith(item) and len(item)>best and loc<>item: + best, pos = len(item), p + if pos==-1: + if loc not in path: path.append(loc) + elif loc not in path[:pos+1]: + while loc in path: path.remove(loc) + path.insert(pos,loc) + + + 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): + 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]), + ImmutableSet(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 +_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 +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: # try it without defaults already on sys.path + working_set = WorkingSet([]) # by starting with an empty path + for dist in working_set.resolve( + parse_requirements(__requires__), Environment() + ): + working_set.add(dist) + 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 |