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: /proc/thread-self/root/proc/self/root/opt/alt/python34/lib64/python3.4/importlib/ Upload File: files >> //proc/thread-self/root/proc/self/root/opt/alt/python34/lib64/python3.4/importlib/_bootstrap.py """Core implementation of import. This module is NOT meant to be directly imported! It has been designed such that it can be bootstrapped into Python as the implementation of import. As such it requires the injection of specific modules and attributes in order to work. One should use importlib as the public-facing version of this module. """ # # IMPORTANT: Whenever making changes to this module, be sure to run # a top-level make in order to get the frozen version of the module # update. Not doing so will result in the Makefile to fail for # all others who don't have a ./python around to freeze the module # in the early stages of compilation. # # See importlib._setup() for what is injected into the global namespace. # When editing this code be aware that code executed at import time CANNOT # reference any injected objects! This includes not only global code but also # anything specified at the class level. # Bootstrap-related code ###################################################### _CASE_INSENSITIVE_PLATFORMS = 'win', 'cygwin', 'darwin' def _make_relax_case(): if sys.platform.startswith(_CASE_INSENSITIVE_PLATFORMS): def _relax_case(): """True if filenames must be checked case-insensitively.""" return b'PYTHONCASEOK' in _os.environ else: def _relax_case(): """True if filenames must be checked case-insensitively.""" return False return _relax_case def _w_long(x): """Convert a 32-bit integer to little-endian.""" return (int(x) & 0xFFFFFFFF).to_bytes(4, 'little') def _r_long(int_bytes): """Convert 4 bytes in little-endian to an integer.""" return int.from_bytes(int_bytes, 'little') def _path_join(*path_parts): """Replacement for os.path.join().""" return path_sep.join([part.rstrip(path_separators) for part in path_parts if part]) def _path_split(path): """Replacement for os.path.split().""" if len(path_separators) == 1: front, _, tail = path.rpartition(path_sep) return front, tail for x in reversed(path): if x in path_separators: front, tail = path.rsplit(x, maxsplit=1) return front, tail return '', path def _path_stat(path): """Stat the path. Made a separate function to make it easier to override in experiments (e.g. cache stat results). """ return _os.stat(path) def _path_is_mode_type(path, mode): """Test whether the path is the specified mode type.""" try: stat_info = _path_stat(path) except OSError: return False return (stat_info.st_mode & 0o170000) == mode def _path_isfile(path): """Replacement for os.path.isfile.""" return _path_is_mode_type(path, 0o100000) def _path_isdir(path): """Replacement for os.path.isdir.""" if not path: path = _os.getcwd() return _path_is_mode_type(path, 0o040000) def _write_atomic(path, data, mode=0o666): """Best-effort function to write data to a path atomically. Be prepared to handle a FileExistsError if concurrent writing of the temporary file is attempted.""" # id() is used to generate a pseudo-random filename. path_tmp = '{}.{}'.format(path, id(path)) fd = _os.open(path_tmp, _os.O_EXCL | _os.O_CREAT | _os.O_WRONLY, mode & 0o666) try: # We first write data to a temporary file, and then use os.replace() to # perform an atomic rename. with _io.FileIO(fd, 'wb') as file: file.write(data) _os.replace(path_tmp, path) except OSError: try: _os.unlink(path_tmp) except OSError: pass raise def _wrap(new, old): """Simple substitute for functools.update_wrapper.""" for replace in ['__module__', '__name__', '__qualname__', '__doc__']: if hasattr(old, replace): setattr(new, replace, getattr(old, replace)) new.__dict__.update(old.__dict__) def _new_module(name): return type(sys)(name) _code_type = type(_wrap.__code__) class _ManageReload: """Manages the possible clean-up of sys.modules for load_module().""" def __init__(self, name): self._name = name def __enter__(self): self._is_reload = self._name in sys.modules def __exit__(self, *args): if any(arg is not None for arg in args) and not self._is_reload: try: del sys.modules[self._name] except KeyError: pass # Module-level locking ######################################################## # A dict mapping module names to weakrefs of _ModuleLock instances _module_locks = {} # A dict mapping thread ids to _ModuleLock instances _blocking_on = {} class _DeadlockError(RuntimeError): pass class _ModuleLock: """A recursive lock implementation which is able to detect deadlocks (e.g. thread 1 trying to take locks A then B, and thread 2 trying to take locks B then A). """ def __init__(self, name): self.lock = _thread.allocate_lock() self.wakeup = _thread.allocate_lock() self.name = name self.owner = None self.count = 0 self.waiters = 0 def has_deadlock(self): # Deadlock avoidance for concurrent circular imports. me = _thread.get_ident() tid = self.owner while True: lock = _blocking_on.get(tid) if lock is None: return False tid = lock.owner if tid == me: return True def acquire(self): """ Acquire the module lock. If a potential deadlock is detected, a _DeadlockError is raised. Otherwise, the lock is always acquired and True is returned. """ tid = _thread.get_ident() _blocking_on[tid] = self try: while True: with self.lock: if self.count == 0 or self.owner == tid: self.owner = tid self.count += 1 return True if self.has_deadlock(): raise _DeadlockError('deadlock detected by %r' % self) if self.wakeup.acquire(False): self.waiters += 1 # Wait for a release() call self.wakeup.acquire() self.wakeup.release() finally: del _blocking_on[tid] def release(self): tid = _thread.get_ident() with self.lock: if self.owner != tid: raise RuntimeError('cannot release un-acquired lock') assert self.count > 0 self.count -= 1 if self.count == 0: self.owner = None if self.waiters: self.waiters -= 1 self.wakeup.release() def __repr__(self): return '_ModuleLock({!r}) at {}'.format(self.name, id(self)) class _DummyModuleLock: """A simple _ModuleLock equivalent for Python builds without multi-threading support.""" def __init__(self, name): self.name = name self.count = 0 def acquire(self): self.count += 1 return True def release(self): if self.count == 0: raise RuntimeError('cannot release un-acquired lock') self.count -= 1 def __repr__(self): return '_DummyModuleLock({!r}) at {}'.format(self.name, id(self)) class _ModuleLockManager: def __init__(self, name): self._name = name self._lock = None def __enter__(self): try: self._lock = _get_module_lock(self._name) finally: _imp.release_lock() self._lock.acquire() def __exit__(self, *args, **kwargs): self._lock.release() # The following two functions are for consumption by Python/import.c. def _get_module_lock(name): """Get or create the module lock for a given module name. Should only be called with the import lock taken.""" lock = None try: lock = _module_locks[name]() except KeyError: pass if lock is None: if _thread is None: lock = _DummyModuleLock(name) else: lock = _ModuleLock(name) def cb(_): del _module_locks[name] _module_locks[name] = _weakref.ref(lock, cb) return lock def _lock_unlock_module(name): """Release the global import lock, and acquires then release the module lock for a given module name. This is used to ensure a module is completely initialized, in the event it is being imported by another thread. Should only be called with the import lock taken.""" lock = _get_module_lock(name) _imp.release_lock() try: lock.acquire() except _DeadlockError: # Concurrent circular import, we'll accept a partially initialized # module object. pass else: lock.release() # Frame stripping magic ############################################### def _call_with_frames_removed(f, *args, **kwds): """remove_importlib_frames in import.c will always remove sequences of importlib frames that end with a call to this function Use it instead of a normal call in places where including the importlib frames introduces unwanted noise into the traceback (e.g. when executing module code) """ return f(*args, **kwds) # Finder/loader utility code ############################################### # Magic word to reject .pyc files generated by other Python versions. # It should change for each incompatible change to the bytecode. # # The value of CR and LF is incorporated so if you ever read or write # a .pyc file in text mode the magic number will be wrong; also, the # Apple MPW compiler swaps their values, botching string constants. # # The magic numbers must be spaced apart at least 2 values, as the # -U interpeter flag will cause MAGIC+1 being used. They have been # odd numbers for some time now. # # There were a variety of old schemes for setting the magic number. # The current working scheme is to increment the previous value by # 10. # # Starting with the adoption of PEP 3147 in Python 3.2, every bump in magic # number also includes a new "magic tag", i.e. a human readable string used # to represent the magic number in __pycache__ directories. When you change # the magic number, you must also set a new unique magic tag. Generally this # can be named after the Python major version of the magic number bump, but # it can really be anything, as long as it's different than anything else # that's come before. The tags are included in the following table, starting # with Python 3.2a0. # # Known values: # Python 1.5: 20121 # Python 1.5.1: 20121 # Python 1.5.2: 20121 # Python 1.6: 50428 # Python 2.0: 50823 # Python 2.0.1: 50823 # Python 2.1: 60202 # Python 2.1.1: 60202 # Python 2.1.2: 60202 # Python 2.2: 60717 # Python 2.3a0: 62011 # Python 2.3a0: 62021 # Python 2.3a0: 62011 (!) # Python 2.4a0: 62041 # Python 2.4a3: 62051 # Python 2.4b1: 62061 # Python 2.5a0: 62071 # Python 2.5a0: 62081 (ast-branch) # Python 2.5a0: 62091 (with) # Python 2.5a0: 62092 (changed WITH_CLEANUP opcode) # Python 2.5b3: 62101 (fix wrong code: for x, in ...) # Python 2.5b3: 62111 (fix wrong code: x += yield) # Python 2.5c1: 62121 (fix wrong lnotab with for loops and # storing constants that should have been removed) # Python 2.5c2: 62131 (fix wrong code: for x, in ... in listcomp/genexp) # Python 2.6a0: 62151 (peephole optimizations and STORE_MAP opcode) # Python 2.6a1: 62161 (WITH_CLEANUP optimization) # Python 2.7a0: 62171 (optimize list comprehensions/change LIST_APPEND) # Python 2.7a0: 62181 (optimize conditional branches: # introduce POP_JUMP_IF_FALSE and POP_JUMP_IF_TRUE) # Python 2.7a0 62191 (introduce SETUP_WITH) # Python 2.7a0 62201 (introduce BUILD_SET) # Python 2.7a0 62211 (introduce MAP_ADD and SET_ADD) # Python 3000: 3000 # 3010 (removed UNARY_CONVERT) # 3020 (added BUILD_SET) # 3030 (added keyword-only parameters) # 3040 (added signature annotations) # 3050 (print becomes a function) # 3060 (PEP 3115 metaclass syntax) # 3061 (string literals become unicode) # 3071 (PEP 3109 raise changes) # 3081 (PEP 3137 make __file__ and __name__ unicode) # 3091 (kill str8 interning) # 3101 (merge from 2.6a0, see 62151) # 3103 (__file__ points to source file) # Python 3.0a4: 3111 (WITH_CLEANUP optimization). # Python 3.0a5: 3131 (lexical exception stacking, including POP_EXCEPT) # Python 3.1a0: 3141 (optimize list, set and dict comprehensions: # change LIST_APPEND and SET_ADD, add MAP_ADD) # Python 3.1a0: 3151 (optimize conditional branches: # introduce POP_JUMP_IF_FALSE and POP_JUMP_IF_TRUE) # Python 3.2a0: 3160 (add SETUP_WITH) # tag: cpython-32 # Python 3.2a1: 3170 (add DUP_TOP_TWO, remove DUP_TOPX and ROT_FOUR) # tag: cpython-32 # Python 3.2a2 3180 (add DELETE_DEREF) # Python 3.3a0 3190 __class__ super closure changed # Python 3.3a0 3200 (__qualname__ added) # 3210 (added size modulo 2**32 to the pyc header) # Python 3.3a1 3220 (changed PEP 380 implementation) # Python 3.3a4 3230 (revert changes to implicit __class__ closure) # Python 3.4a1 3250 (evaluate positional default arguments before # keyword-only defaults) # Python 3.4a1 3260 (add LOAD_CLASSDEREF; allow locals of class to override # free vars) # Python 3.4a1 3270 (various tweaks to the __class__ closure) # Python 3.4a1 3280 (remove implicit class argument) # Python 3.4a4 3290 (changes to __qualname__ computation) # Python 3.4a4 3300 (more changes to __qualname__ computation) # Python 3.4rc2 3310 (alter __qualname__ computation) # # MAGIC must change whenever the bytecode emitted by the compiler may no # longer be understood by older implementations of the eval loop (usually # due to the addition of new opcodes). MAGIC_NUMBER = (3310).to_bytes(2, 'little') + b'\r\n' _RAW_MAGIC_NUMBER = int.from_bytes(MAGIC_NUMBER, 'little') # For import.c _PYCACHE = '__pycache__' SOURCE_SUFFIXES = ['.py'] # _setup() adds .pyw as needed. DEBUG_BYTECODE_SUFFIXES = ['.pyc'] OPTIMIZED_BYTECODE_SUFFIXES = ['.pyo'] def cache_from_source(path, debug_override=None): """Given the path to a .py file, return the path to its .pyc/.pyo file. The .py file does not need to exist; this simply returns the path to the .pyc/.pyo file calculated as if the .py file were imported. The extension will be .pyc unless sys.flags.optimize is non-zero, then it will be .pyo. If debug_override is not None, then it must be a boolean and is used in place of sys.flags.optimize. If sys.implementation.cache_tag is None then NotImplementedError is raised. """ debug = not sys.flags.optimize if debug_override is None else debug_override if debug: suffixes = DEBUG_BYTECODE_SUFFIXES else: suffixes = OPTIMIZED_BYTECODE_SUFFIXES head, tail = _path_split(path) base, sep, rest = tail.rpartition('.') tag = sys.implementation.cache_tag if tag is None: raise NotImplementedError('sys.implementation.cache_tag is None') filename = ''.join([(base if base else rest), sep, tag, suffixes[0]]) return _path_join(head, _PYCACHE, filename) def source_from_cache(path): """Given the path to a .pyc./.pyo file, return the path to its .py file. The .pyc/.pyo file does not need to exist; this simply returns the path to the .py file calculated to correspond to the .pyc/.pyo file. If path does not conform to PEP 3147 format, ValueError will be raised. If sys.implementation.cache_tag is None then NotImplementedError is raised. """ if sys.implementation.cache_tag is None: raise NotImplementedError('sys.implementation.cache_tag is None') head, pycache_filename = _path_split(path) head, pycache = _path_split(head) if pycache != _PYCACHE: raise ValueError('{} not bottom-level directory in ' '{!r}'.format(_PYCACHE, path)) if pycache_filename.count('.') != 2: raise ValueError('expected only 2 dots in ' '{!r}'.format(pycache_filename)) base_filename = pycache_filename.partition('.')[0] return _path_join(head, base_filename + SOURCE_SUFFIXES[0]) def _get_sourcefile(bytecode_path): """Convert a bytecode file path to a source path (if possible). This function exists purely for backwards-compatibility for PyImport_ExecCodeModuleWithFilenames() in the C API. """ if len(bytecode_path) == 0: return None rest, _, extension = bytecode_path.rpartition('.') if not rest or extension.lower()[-3:-1] != 'py': return bytecode_path try: source_path = source_from_cache(bytecode_path) except (NotImplementedError, ValueError): source_path = bytecode_path[:-1] return source_path if _path_isfile(source_path) else bytecode_path def _calc_mode(path): """Calculate the mode permissions for a bytecode file.""" try: mode = _path_stat(path).st_mode except OSError: mode = 0o666 # We always ensure write access so we can update cached files # later even when the source files are read-only on Windows (#6074) mode |= 0o200 return mode def _verbose_message(message, *args, verbosity=1): """Print the message to stderr if -v/PYTHONVERBOSE is turned on.""" if sys.flags.verbose >= verbosity: if not message.startswith(('#', 'import ')): message = '# ' + message print(message.format(*args), file=sys.stderr) def _check_name(method): """Decorator to verify that the module being requested matches the one the loader can handle. The first argument (self) must define _name which the second argument is compared against. If the comparison fails then ImportError is raised. """ def _check_name_wrapper(self, name=None, *args, **kwargs): if name is None: name = self.name elif self.name != name: raise ImportError('loader cannot handle %s' % name, name=name) return method(self, name, *args, **kwargs) _wrap(_check_name_wrapper, method) return _check_name_wrapper def _requires_builtin(fxn): """Decorator to verify the named module is built-in.""" def _requires_builtin_wrapper(self, fullname): if fullname not in sys.builtin_module_names: raise ImportError('{!r} is not a built-in module'.format(fullname), name=fullname) return fxn(self, fullname) _wrap(_requires_builtin_wrapper, fxn) return _requires_builtin_wrapper def _requires_frozen(fxn): """Decorator to verify the named module is frozen.""" def _requires_frozen_wrapper(self, fullname): if not _imp.is_frozen(fullname): raise ImportError('{!r} is not a frozen module'.format(fullname), name=fullname) return fxn(self, fullname) _wrap(_requires_frozen_wrapper, fxn) return _requires_frozen_wrapper def _find_module_shim(self, fullname): """Try to find a loader for the specified module by delegating to self.find_loader(). This method is deprecated in favor of finder.find_spec(). """ # Call find_loader(). If it returns a string (indicating this # is a namespace package portion), generate a warning and # return None. loader, portions = self.find_loader(fullname) if loader is None and len(portions): msg = 'Not importing directory {}: missing __init__' _warnings.warn(msg.format(portions[0]), ImportWarning) return loader def _load_module_shim(self, fullname): """Load the specified module into sys.modules and return it. This method is deprecated. Use loader.exec_module instead. """ spec = spec_from_loader(fullname, self) methods = _SpecMethods(spec) if fullname in sys.modules: module = sys.modules[fullname] methods.exec(module) return sys.modules[fullname] else: return methods.load() def _validate_bytecode_header(data, source_stats=None, name=None, path=None): """Validate the header of the passed-in bytecode against source_stats (if given) and returning the bytecode that can be compiled by compile(). All other arguments are used to enhance error reporting. ImportError is raised when the magic number is incorrect or the bytecode is found to be stale. EOFError is raised when the data is found to be truncated. """ exc_details = {} if name is not None: exc_details['name'] = name else: # To prevent having to make all messages have a conditional name. name = '<bytecode>' if path is not None: exc_details['path'] = path magic = data[:4] raw_timestamp = data[4:8] raw_size = data[8:12] if magic != MAGIC_NUMBER: message = 'bad magic number in {!r}: {!r}'.format(name, magic) _verbose_message('{}', message) raise ImportError(message, **exc_details) elif len(raw_timestamp) != 4: message = 'reached EOF while reading timestamp in {!r}'.format(name) _verbose_message('{}', message) raise EOFError(message) elif len(raw_size) != 4: message = 'reached EOF while reading size of source in {!r}'.format(name) _verbose_message('{}', message) raise EOFError(message) if source_stats is not None: try: source_mtime = int(source_stats['mtime']) except KeyError: pass else: if _r_long(raw_timestamp) != source_mtime: message = 'bytecode is stale for {!r}'.format(name) _verbose_message('{}', message) raise ImportError(message, **exc_details) try: source_size = source_stats['size'] & 0xFFFFFFFF except KeyError: pass else: if _r_long(raw_size) != source_size: raise ImportError('bytecode is stale for {!r}'.format(name), **exc_details) return data[12:] def _compile_bytecode(data, name=None, bytecode_path=None, source_path=None): """Compile bytecode as returned by _validate_bytecode_header().""" code = marshal.loads(data) if isinstance(code, _code_type): _verbose_message('code object from {!r}', bytecode_path) if source_path is not None: _imp._fix_co_filename(code, source_path) return code else: raise ImportError('Non-code object in {!r}'.format(bytecode_path), name=name, path=bytecode_path) def _code_to_bytecode(code, mtime=0, source_size=0): """Compile a code object into bytecode for writing out to a byte-compiled file.""" data = bytearray(MAGIC_NUMBER) data.extend(_w_long(mtime)) data.extend(_w_long(source_size)) data.extend(marshal.dumps(code)) return data def decode_source(source_bytes): """Decode bytes representing source code and return the string. Universal newline support is used in the decoding. """ import tokenize # To avoid bootstrap issues. source_bytes_readline = _io.BytesIO(source_bytes).readline encoding = tokenize.detect_encoding(source_bytes_readline) newline_decoder = _io.IncrementalNewlineDecoder(None, True) return newline_decoder.decode(source_bytes.decode(encoding[0])) # Module specifications ####################################################### def _module_repr(module): # The implementation of ModuleType__repr__(). loader = getattr(module, '__loader__', None) if hasattr(loader, 'module_repr'): # As soon as BuiltinImporter, FrozenImporter, and NamespaceLoader # drop their implementations for module_repr. we can add a # deprecation warning here. try: return loader.module_repr(module) except Exception: pass try: spec = module.__spec__ except AttributeError: pass else: if spec is not None: return _SpecMethods(spec).module_repr() # We could use module.__class__.__name__ instead of 'module' in the # various repr permutations. try: name = module.__name__ except AttributeError: name = '?' try: filename = module.__file__ except AttributeError: if loader is None: return '<module {!r}>'.format(name) else: return '<module {!r} ({!r})>'.format(name, loader) else: return '<module {!r} from {!r}>'.format(name, filename) class _installed_safely: def __init__(self, module): self._module = module self._spec = module.__spec__ def __enter__(self): # This must be done before putting the module in sys.modules # (otherwise an optimization shortcut in import.c becomes # wrong) self._spec._initializing = True sys.modules[self._spec.name] = self._module def __exit__(self, *args): try: spec = self._spec if any(arg is not None for arg in args): try: del sys.modules[spec.name] except KeyError: pass else: _verbose_message('import {!r} # {!r}', spec.name, spec.loader) finally: self._spec._initializing = False class ModuleSpec: """The specification for a module, used for loading. A module's spec is the source for information about the module. For data associated with the module, including source, use the spec's loader. `name` is the absolute name of the module. `loader` is the loader to use when loading the module. `parent` is the name of the package the module is in. The parent is derived from the name. `is_package` determines if the module is considered a package or not. On modules this is reflected by the `__path__` attribute. `origin` is the specific location used by the loader from which to load the module, if that information is available. When filename is set, origin will match. `has_location` indicates that a spec's "origin" reflects a location. When this is True, `__file__` attribute of the module is set. `cached` is the location of the cached bytecode file, if any. It corresponds to the `__cached__` attribute. `submodule_search_locations` is the sequence of path entries to search when importing submodules. If set, is_package should be True--and False otherwise. Packages are simply modules that (may) have submodules. If a spec has a non-None value in `submodule_search_locations`, the import system will consider modules loaded from the spec as packages. Only finders (see importlib.abc.MetaPathFinder and importlib.abc.PathEntryFinder) should modify ModuleSpec instances. """ def __init__(self, name, loader, *, origin=None, loader_state=None, is_package=None): self.name = name self.loader = loader self.origin = origin self.loader_state = loader_state self.submodule_search_locations = [] if is_package else None # file-location attributes self._set_fileattr = False self._cached = None def __repr__(self): args = ['name={!r}'.format(self.name), 'loader={!r}'.format(self.loader)] if self.origin is not None: args.append('origin={!r}'.format(self.origin)) if self.submodule_search_locations is not None: args.append('submodule_search_locations={}' .format(self.submodule_search_locations)) return '{}({})'.format(self.__class__.__name__, ', '.join(args)) def __eq__(self, other): smsl = self.submodule_search_locations try: return (self.name == other.name and self.loader == other.loader and self.origin == other.origin and smsl == other.submodule_search_locations and self.cached == other.cached and self.has_location == other.has_location) except AttributeError: return False @property def cached(self): if self._cached is None: if self.origin is not None and self._set_fileattr: filename = self.origin if filename.endswith(tuple(SOURCE_SUFFIXES)): try: self._cached = cache_from_source(filename) except NotImplementedError: pass elif filename.endswith(tuple(BYTECODE_SUFFIXES)): self._cached = filename return self._cached @cached.setter def cached(self, cached): self._cached = cached @property def parent(self): """The name of the module's parent.""" if self.submodule_search_locations is None: return self.name.rpartition('.')[0] else: return self.name @property def has_location(self): return self._set_fileattr @has_location.setter def has_location(self, value): self._set_fileattr = bool(value) def spec_from_loader(name, loader, *, origin=None, is_package=None): """Return a module spec based on various loader methods.""" if hasattr(loader, 'get_filename'): if is_package is None: return spec_from_file_location(name, loader=loader) search = [] if is_package else None return spec_from_file_location(name, loader=loader, submodule_search_locations=search) if is_package is None: if hasattr(loader, 'is_package'): try: is_package = loader.is_package(name) except ImportError: is_package = None # aka, undefined else: # the default is_package = False return ModuleSpec(name, loader, origin=origin, is_package=is_package) _POPULATE = object() def spec_from_file_location(name, location=None, *, loader=None, submodule_search_locations=_POPULATE): """Return a module spec based on a file location. To indicate that the module is a package, set submodule_search_locations to a list of directory paths. An empty list is sufficient, though its not otherwise useful to the import system. The loader must take a spec as its only __init__() arg. """ if location is None: # The caller may simply want a partially populated location- # oriented spec. So we set the location to a bogus value and # fill in as much as we can. location = '<unknown>' if hasattr(loader, 'get_filename'): # ExecutionLoader try: location = loader.get_filename(name) except ImportError: pass # If the location is on the filesystem, but doesn't actually exist, # we could return None here, indicating that the location is not # valid. However, we don't have a good way of testing since an # indirect location (e.g. a zip file or URL) will look like a # non-existent file relative to the filesystem. spec = ModuleSpec(name, loader, origin=location) spec._set_fileattr = True # Pick a loader if one wasn't provided. if loader is None: for loader_class, suffixes in _get_supported_file_loaders(): if location.endswith(tuple(suffixes)): loader = loader_class(name, location) spec.loader = loader break else: return None # Set submodule_search_paths appropriately. if submodule_search_locations is _POPULATE: # Check the loader. if hasattr(loader, 'is_package'): try: is_package = loader.is_package(name) except ImportError: pass else: if is_package: spec.submodule_search_locations = [] else: spec.submodule_search_locations = submodule_search_locations if spec.submodule_search_locations == []: if location: dirname = _path_split(location)[0] spec.submodule_search_locations.append(dirname) return spec def _spec_from_module(module, loader=None, origin=None): # This function is meant for use in _setup(). try: spec = module.__spec__ except AttributeError: pass else: if spec is not None: return spec name = module.__name__ if loader is None: try: loader = module.__loader__ except AttributeError: # loader will stay None. pass try: location = module.__file__ except AttributeError: location = None if origin is None: if location is None: try: origin = loader._ORIGIN except AttributeError: origin = None else: origin = location try: cached = module.__cached__ except AttributeError: cached = None try: submodule_search_locations = list(module.__path__) except AttributeError: submodule_search_locations = None spec = ModuleSpec(name, loader, origin=origin) spec._set_fileattr = False if location is None else True spec.cached = cached spec.submodule_search_locations = submodule_search_locations return spec class _SpecMethods: """Convenience wrapper around spec objects to provide spec-specific methods.""" # The various spec_from_* functions could be made factory methods here. def __init__(self, spec): self.spec = spec def module_repr(self): """Return the repr to use for the module.""" # We mostly replicate _module_repr() using the spec attributes. spec = self.spec name = '?' if spec.name is None else spec.name if spec.origin is None: if spec.loader is None: return '<module {!r}>'.format(name) else: return '<module {!r} ({!r})>'.format(name, spec.loader) else: if spec.has_location: return '<module {!r} from {!r}>'.format(name, spec.origin) else: return '<module {!r} ({})>'.format(spec.name, spec.origin) def init_module_attrs(self, module, *, _override=False, _force_name=True): """Set the module's attributes. All missing import-related module attributes will be set. Here is how the spec attributes map onto the module: spec.name -> module.__name__ spec.loader -> module.__loader__ spec.parent -> module.__package__ spec -> module.__spec__ Optional: spec.origin -> module.__file__ (if spec.set_fileattr is true) spec.cached -> module.__cached__ (if __file__ also set) spec.submodule_search_locations -> module.__path__ (if set) """ spec = self.spec # The passed in module may be not support attribute assignment, # in which case we simply don't set the attributes. # __name__ if (_override or _force_name or getattr(module, '__name__', None) is None): try: module.__name__ = spec.name except AttributeError: pass # __loader__ if _override or getattr(module, '__loader__', None) is None: loader = spec.loader if loader is None: # A backward compatibility hack. if spec.submodule_search_locations is not None: loader = _NamespaceLoader.__new__(_NamespaceLoader) loader._path = spec.submodule_search_locations try: module.__loader__ = loader except AttributeError: pass # __package__ if _override or getattr(module, '__package__', None) is None: try: module.__package__ = spec.parent except AttributeError: pass # __spec__ try: module.__spec__ = spec except AttributeError: pass # __path__ if _override or getattr(module, '__path__', None) is None: if spec.submodule_search_locations is not None: try: module.__path__ = spec.submodule_search_locations except AttributeError: pass if spec.has_location: # __file__ if _override or getattr(module, '__file__', None) is None: try: module.__file__ = spec.origin except AttributeError: pass # __cached__ if _override or getattr(module, '__cached__', None) is None: if spec.cached is not None: try: module.__cached__ = spec.cached except AttributeError: pass def create(self): """Return a new module to be loaded. The import-related module attributes are also set with the appropriate values from the spec. """ spec = self.spec # Typically loaders will not implement create_module(). if hasattr(spec.loader, 'create_module'): # If create_module() returns `None` it means the default # module creation should be used. module = spec.loader.create_module(spec) else: module = None if module is None: # This must be done before open() is ever called as the 'io' # module implicitly imports 'locale' and would otherwise # trigger an infinite loop. module = _new_module(spec.name) self.init_module_attrs(module) return module def _exec(self, module): """Do everything necessary to execute the module. The namespace of `module` is used as the target of execution. This method uses the loader's `exec_module()` method. """ self.spec.loader.exec_module(module) # Used by importlib.reload() and _load_module_shim(). def exec(self, module): """Execute the spec in an existing module's namespace.""" name = self.spec.name _imp.acquire_lock() with _ModuleLockManager(name): if sys.modules.get(name) is not module: msg = 'module {!r} not in sys.modules'.format(name) raise ImportError(msg, name=name) if self.spec.loader is None: if self.spec.submodule_search_locations is None: raise ImportError('missing loader', name=self.spec.name) # namespace package self.init_module_attrs(module, _override=True) return module self.init_module_attrs(module, _override=True) if not hasattr(self.spec.loader, 'exec_module'): # (issue19713) Once BuiltinImporter and ExtensionFileLoader # have exec_module() implemented, we can add a deprecation # warning here. self.spec.loader.load_module(name) else: self._exec(module) return sys.modules[name] def _load_backward_compatible(self): # (issue19713) Once BuiltinImporter and ExtensionFileLoader # have exec_module() implemented, we can add a deprecation # warning here. spec = self.spec spec.loader.load_module(spec.name) # The module must be in sys.modules at this point! module = sys.modules[spec.name] if getattr(module, '__loader__', None) is None: try: module.__loader__ = spec.loader except AttributeError: pass if getattr(module, '__package__', None) is None: try: # Since module.__path__ may not line up with # spec.submodule_search_paths, we can't necessarily rely # on spec.parent here. module.__package__ = module.__name__ if not hasattr(module, '__path__'): module.__package__ = spec.name.rpartition('.')[0] except AttributeError: pass if getattr(module, '__spec__', None) is None: try: module.__spec__ = spec except AttributeError: pass return module def _load_unlocked(self): # A helper for direct use by the import system. if self.spec.loader is not None: # not a namespace package if not hasattr(self.spec.loader, 'exec_module'): return self._load_backward_compatible() module = self.create() with _installed_safely(module): if self.spec.loader is None: if self.spec.submodule_search_locations is None: raise ImportError('missing loader', name=self.spec.name) # A namespace package so do nothing. else: self._exec(module) # We don't ensure that the import-related module attributes get # set in the sys.modules replacement case. Such modules are on # their own. return sys.modules[self.spec.name] # A method used during testing of _load_unlocked() and by # _load_module_shim(). def load(self): """Return a new module object, loaded by the spec's loader. The module is not added to its parent. If a module is already in sys.modules, that existing module gets clobbered. """ _imp.acquire_lock() with _ModuleLockManager(self.spec.name): return self._load_unlocked() def _fix_up_module(ns, name, pathname, cpathname=None): # This function is used by PyImport_ExecCodeModuleObject(). loader = ns.get('__loader__') spec = ns.get('__spec__') if not loader: if spec: loader = spec.loader elif pathname == cpathname: loader = SourcelessFileLoader(name, pathname) else: loader = SourceFileLoader(name, pathname) if not spec: spec = spec_from_file_location(name, pathname, loader=loader) try: ns['__spec__'] = spec ns['__loader__'] = loader ns['__file__'] = pathname ns['__cached__'] = cpathname except Exception: # Not important enough to report. pass # Loaders ##################################################################### class BuiltinImporter: """Meta path import for built-in modules. All methods are either class or static methods to avoid the need to instantiate the class. """ @staticmethod def module_repr(module): """Return repr for the module. The method is deprecated. The import machinery does the job itself. """ return '<module {!r} (built-in)>'.format(module.__name__) @classmethod def find_spec(cls, fullname, path=None, target=None): if path is not None: return None if _imp.is_builtin(fullname): return spec_from_loader(fullname, cls, origin='built-in') else: return None @classmethod def find_module(cls, fullname, path=None): """Find the built-in module. If 'path' is ever specified then the search is considered a failure. This method is deprecated. Use find_spec() instead. """ spec = cls.find_spec(fullname, path) return spec.loader if spec is not None else None @classmethod @_requires_builtin def load_module(cls, fullname): """Load a built-in module.""" # Once an exec_module() implementation is added we can also # add a deprecation warning here. with _ManageReload(fullname): module = _call_with_frames_removed(_imp.init_builtin, fullname) module.__loader__ = cls module.__package__ = '' return module @classmethod @_requires_builtin def get_code(cls, fullname): """Return None as built-in modules do not have code objects.""" return None @classmethod @_requires_builtin def get_source(cls, fullname): """Return None as built-in modules do not have source code.""" return None @classmethod @_requires_builtin def is_package(cls, fullname): """Return False as built-in modules are never packages.""" return False class FrozenImporter: """Meta path import for frozen modules. All methods are either class or static methods to avoid the need to instantiate the class. """ @staticmethod def module_repr(m): """Return repr for the module. The method is deprecated. The import machinery does the job itself. """ return '<module {!r} (frozen)>'.format(m.__name__) @classmethod def find_spec(cls, fullname, path=None, target=None): if _imp.is_frozen(fullname): return spec_from_loader(fullname, cls, origin='frozen') else: return None @classmethod def find_module(cls, fullname, path=None): """Find a frozen module. This method is deprecated. Use find_spec() instead. """ return cls if _imp.is_frozen(fullname) else None @staticmethod def exec_module(module): name = module.__spec__.name if not _imp.is_frozen(name): raise ImportError('{!r} is not a frozen module'.format(name), name=name) code = _call_with_frames_removed(_imp.get_frozen_object, name) exec(code, module.__dict__) @classmethod def load_module(cls, fullname): """Load a frozen module. This method is deprecated. Use exec_module() instead. """ return _load_module_shim(cls, fullname) @classmethod @_requires_frozen def get_code(cls, fullname): """Return the code object for the frozen module.""" return _imp.get_frozen_object(fullname) @classmethod @_requires_frozen def get_source(cls, fullname): """Return None as frozen modules do not have source code.""" return None @classmethod @_requires_frozen def is_package(cls, fullname): """Return True if the frozen module is a package.""" return _imp.is_frozen_package(fullname) class WindowsRegistryFinder: """Meta path finder for modules declared in the Windows registry.""" REGISTRY_KEY = ( 'Software\\Python\\PythonCore\\{sys_version}' '\\Modules\\{fullname}') REGISTRY_KEY_DEBUG = ( 'Software\\Python\\PythonCore\\{sys_version}' '\\Modules\\{fullname}\\Debug') DEBUG_BUILD = False # Changed in _setup() @classmethod def _open_registry(cls, key): try: return _winreg.OpenKey(_winreg.HKEY_CURRENT_USER, key) except OSError: return _winreg.OpenKey(_winreg.HKEY_LOCAL_MACHINE, key) @classmethod def _search_registry(cls, fullname): if cls.DEBUG_BUILD: registry_key = cls.REGISTRY_KEY_DEBUG else: registry_key = cls.REGISTRY_KEY key = registry_key.format(fullname=fullname, sys_version=sys.version[:3]) try: with cls._open_registry(key) as hkey: filepath = _winreg.QueryValue(hkey, '') except OSError: return None return filepath @classmethod def find_spec(cls, fullname, path=None, target=None): filepath = cls._search_registry(fullname) if filepath is None: return None try: _path_stat(filepath) except OSError: return None for loader, suffixes in _get_supported_file_loaders(): if filepath.endswith(tuple(suffixes)): spec = spec_from_loader(fullname, loader(fullname, filepath), origin=filepath) return spec @classmethod def find_module(cls, fullname, path=None): """Find module named in the registry. This method is deprecated. Use exec_module() instead. """ spec = cls.find_spec(fullname, path) if spec is not None: return spec.loader else: return None class _LoaderBasics: """Base class of common code needed by both SourceLoader and SourcelessFileLoader.""" def is_package(self, fullname): """Concrete implementation of InspectLoader.is_package by checking if the path returned by get_filename has a filename of '__init__.py'.""" filename = _path_split(self.get_filename(fullname))[1] filename_base = filename.rsplit('.', 1)[0] tail_name = fullname.rpartition('.')[2] return filename_base == '__init__' and tail_name != '__init__' def exec_module(self, module): """Execute the module.""" code = self.get_code(module.__name__) if code is None: raise ImportError('cannot load module {!r} when get_code() ' 'returns None'.format(module.__name__)) _call_with_frames_removed(exec, code, module.__dict__) load_module = _load_module_shim class SourceLoader(_LoaderBasics): def path_mtime(self, path): """Optional method that returns the modification time (an int) for the specified path, where path is a str. Raises IOError when the path cannot be handled. """ raise IOError def path_stats(self, path): """Optional method returning a metadata dict for the specified path to by the path (str). Possible keys: - 'mtime' (mandatory) is the numeric timestamp of last source code modification; - 'size' (optional) is the size in bytes of the source code. Implementing this method allows the loader to read bytecode files. Raises IOError when the path cannot be handled. """ return {'mtime': self.path_mtime(path)} def _cache_bytecode(self, source_path, cache_path, data): """Optional method which writes data (bytes) to a file path (a str). Implementing this method allows for the writing of bytecode files. The source path is needed in order to correctly transfer permissions """ # For backwards compatibility, we delegate to set_data() return self.set_data(cache_path, data) def set_data(self, path, data): """Optional method which writes data (bytes) to a file path (a str). Implementing this method allows for the writing of bytecode files. """ def get_source(self, fullname): """Concrete implementation of InspectLoader.get_source.""" path = self.get_filename(fullname) try: source_bytes = self.get_data(path) except OSError as exc: raise ImportError('source not available through get_data()', name=fullname) from exc return decode_source(source_bytes) def source_to_code(self, data, path, *, _optimize=-1): """Return the code object compiled from source. The 'data' argument can be any object type that compile() supports. """ return _call_with_frames_removed(compile, data, path, 'exec', dont_inherit=True, optimize=_optimize) def get_code(self, fullname): """Concrete implementation of InspectLoader.get_code. Reading of bytecode requires path_stats to be implemented. To write bytecode, set_data must also be implemented. """ source_path = self.get_filename(fullname) source_mtime = None try: bytecode_path = cache_from_source(source_path) except NotImplementedError: bytecode_path = None else: try: st = self.path_stats(source_path) except IOError: pass else: source_mtime = int(st['mtime']) try: data = self.get_data(bytecode_path) except OSError: pass else: try: bytes_data = _validate_bytecode_header(data, source_stats=st, name=fullname, path=bytecode_path) except (ImportError, EOFError): pass else: _verbose_message('{} matches {}', bytecode_path, source_path) return _compile_bytecode(bytes_data, name=fullname, bytecode_path=bytecode_path, source_path=source_path) source_bytes = self.get_data(source_path) code_object = self.source_to_code(source_bytes, source_path) _verbose_message('code object from {}', source_path) if (not sys.dont_write_bytecode and bytecode_path is not None and source_mtime is not None): data = _code_to_bytecode(code_object, source_mtime, len(source_bytes)) try: self._cache_bytecode(source_path, bytecode_path, data) _verbose_message('wrote {!r}', bytecode_path) except NotImplementedError: pass return code_object class FileLoader: """Base file loader class which implements the loader protocol methods that require file system usage.""" def __init__(self, fullname, path): """Cache the module name and the path to the file found by the finder.""" self.name = fullname self.path = path def __eq__(self, other): return (self.__class__ == other.__class__ and self.__dict__ == other.__dict__) def __hash__(self): return hash(self.name) ^ hash(self.path) @_check_name def load_module(self, fullname): """Load a module from a file. This method is deprecated. Use exec_module() instead. """ # The only reason for this method is for the name check. # Issue #14857: Avoid the zero-argument form of super so the implementation # of that form can be updated without breaking the frozen module return super(FileLoader, self).load_module(fullname) @_check_name def get_filename(self, fullname): """Return the path to the source file as found by the finder.""" return self.path def get_data(self, path): """Return the data from path as raw bytes.""" with _io.FileIO(path, 'r') as file: return file.read() class SourceFileLoader(FileLoader, SourceLoader): """Concrete implementation of SourceLoader using the file system.""" def path_stats(self, path): """Return the metadata for the path.""" st = _path_stat(path) return {'mtime': st.st_mtime, 'size': st.st_size} def _cache_bytecode(self, source_path, bytecode_path, data): # Adapt between the two APIs mode = _calc_mode(source_path) return self.set_data(bytecode_path, data, _mode=mode) def set_data(self, path, data, *, _mode=0o666): """Write bytes data to a file.""" parent, filename = _path_split(path) path_parts = [] # Figure out what directories are missing. while parent and not _path_isdir(parent): parent, part = _path_split(parent) path_parts.append(part) # Create needed directories. for part in reversed(path_parts): parent = _path_join(parent, part) try: _os.mkdir(parent) except FileExistsError: # Probably another Python process already created the dir. continue except OSError as exc: # Could be a permission error, read-only filesystem: just forget # about writing the data. _verbose_message('could not create {!r}: {!r}', parent, exc) return try: _write_atomic(path, data, _mode) _verbose_message('created {!r}', path) except OSError as exc: # Same as above: just don't write the bytecode. _verbose_message('could not create {!r}: {!r}', path, exc) class SourcelessFileLoader(FileLoader, _LoaderBasics): """Loader which handles sourceless file imports.""" def get_code(self, fullname): path = self.get_filename(fullname) data = self.get_data(path) bytes_data = _validate_bytecode_header(data, name=fullname, path=path) return _compile_bytecode(bytes_data, name=fullname, bytecode_path=path) def get_source(self, fullname): """Return None as there is no source code.""" return None # Filled in by _setup(). EXTENSION_SUFFIXES = [] class ExtensionFileLoader: """Loader for extension modules. The constructor is designed to work with FileFinder. """ def __init__(self, name, path): self.name = name self.path = path def __eq__(self, other): return (self.__class__ == other.__class__ and self.__dict__ == other.__dict__) def __hash__(self): return hash(self.name) ^ hash(self.path) @_check_name def load_module(self, fullname): """Load an extension module.""" # Once an exec_module() implementation is added we can also # add a deprecation warning here. with _ManageReload(fullname): module = _call_with_frames_removed(_imp.load_dynamic, fullname, self.path) _verbose_message('extension module loaded from {!r}', self.path) is_package = self.is_package(fullname) if is_package and not hasattr(module, '__path__'): module.__path__ = [_path_split(self.path)[0]] module.__loader__ = self module.__package__ = module.__name__ if not is_package: module.__package__ = module.__package__.rpartition('.')[0] return module def is_package(self, fullname): """Return True if the extension module is a package.""" file_name = _path_split(self.path)[1] return any(file_name == '__init__' + suffix for suffix in EXTENSION_SUFFIXES) def get_code(self, fullname): """Return None as an extension module cannot create a code object.""" return None def get_source(self, fullname): """Return None as extension modules have no source code.""" return None @_check_name def get_filename(self, fullname): """Return the path to the source file as found by the finder.""" return self.path class _NamespacePath: """Represents a namespace package's path. It uses the module name to find its parent module, and from there it looks up the parent's __path__. When this changes, the module's own path is recomputed, using path_finder. For top-level modules, the parent module's path is sys.path.""" def __init__(self, name, path, path_finder): self._name = name self._path = path self._last_parent_path = tuple(self._get_parent_path()) self._path_finder = path_finder def _find_parent_path_names(self): """Returns a tuple of (parent-module-name, parent-path-attr-name)""" parent, dot, me = self._name.rpartition('.') if dot == '': # This is a top-level module. sys.path contains the parent path. return 'sys', 'path' # Not a top-level module. parent-module.__path__ contains the # parent path. return parent, '__path__' def _get_parent_path(self): parent_module_name, path_attr_name = self._find_parent_path_names() return getattr(sys.modules[parent_module_name], path_attr_name) def _recalculate(self): # If the parent's path has changed, recalculate _path parent_path = tuple(self._get_parent_path()) # Make a copy if parent_path != self._last_parent_path: spec = self._path_finder(self._name, parent_path) # Note that no changes are made if a loader is returned, but we # do remember the new parent path if spec is not None and spec.loader is None: if spec.submodule_search_locations: self._path = spec.submodule_search_locations self._last_parent_path = parent_path # Save the copy return self._path def __iter__(self): return iter(self._recalculate()) def __len__(self): return len(self._recalculate()) def __repr__(self): return '_NamespacePath({!r})'.format(self._path) def __contains__(self, item): return item in self._recalculate() def append(self, item): self._path.append(item) # We use this exclusively in init_module_attrs() for backward-compatibility. class _NamespaceLoader: def __init__(self, name, path, path_finder): self._path = _NamespacePath(name, path, path_finder) @classmethod def module_repr(cls, module): """Return repr for the module. The method is deprecated. The import machinery does the job itself. """ return '<module {!r} (namespace)>'.format(module.__name__) def is_package(self, fullname): return True def get_source(self, fullname): return '' def get_code(self, fullname): return compile('', '<string>', 'exec', dont_inherit=True) def exec_module(self, module): pass def load_module(self, fullname): """Load a namespace module. This method is deprecated. Use exec_module() instead. """ # The import system never calls this method. _verbose_message('namespace module loaded with path {!r}', self._path) return _load_module_shim(self, fullname) # Finders ##################################################################### class PathFinder: """Meta path finder for sys.path and package __path__ attributes.""" @classmethod def invalidate_caches(cls): """Call the invalidate_caches() method on all path entry finders stored in sys.path_importer_caches (where implemented).""" for finder in sys.path_importer_cache.values(): if hasattr(finder, 'invalidate_caches'): finder.invalidate_caches() @classmethod def _path_hooks(cls, path): """Search sequence of hooks for a finder for 'path'. If 'hooks' is false then use sys.path_hooks. """ if not sys.path_hooks: _warnings.warn('sys.path_hooks is empty', ImportWarning) for hook in sys.path_hooks: try: return hook(path) except ImportError: continue else: return None @classmethod def _path_importer_cache(cls, path): """Get the finder for the path entry from sys.path_importer_cache. If the path entry is not in the cache, find the appropriate finder and cache it. If no finder is available, store None. """ if path == '': path = _os.getcwd() try: finder = sys.path_importer_cache[path] except KeyError: finder = cls._path_hooks(path) sys.path_importer_cache[path] = finder return finder @classmethod def _legacy_get_spec(cls, fullname, finder): # This would be a good place for a DeprecationWarning if # we ended up going that route. if hasattr(finder, 'find_loader'): loader, portions = finder.find_loader(fullname) else: loader = finder.find_module(fullname) portions = [] if loader is not None: return spec_from_loader(fullname, loader) spec = ModuleSpec(fullname, None) spec.submodule_search_locations = portions return spec @classmethod def _get_spec(cls, fullname, path, target=None): """Find the loader or namespace_path for this module/package name.""" # If this ends up being a namespace package, namespace_path is # the list of paths that will become its __path__ namespace_path = [] for entry in path: if not isinstance(entry, (str, bytes)): continue finder = cls._path_importer_cache(entry) if finder is not None: if hasattr(finder, 'find_spec'): spec = finder.find_spec(fullname, target) else: spec = cls._legacy_get_spec(fullname, finder) if spec is None: continue if spec.loader is not None: return spec portions = spec.submodule_search_locations if portions is None: raise ImportError('spec missing loader') # This is possibly part of a namespace package. # Remember these path entries (if any) for when we # create a namespace package, and continue iterating # on path. namespace_path.extend(portions) else: spec = ModuleSpec(fullname, None) spec.submodule_search_locations = namespace_path return spec @classmethod def find_spec(cls, fullname, path=None, target=None): """find the module on sys.path or 'path' based on sys.path_hooks and sys.path_importer_cache.""" if path is None: path = sys.path spec = cls._get_spec(fullname, path, target) if spec is None: return None elif spec.loader is None: namespace_path = spec.submodule_search_locations if namespace_path: # We found at least one namespace path. Return a # spec which can create the namespace package. spec.origin = 'namespace' spec.submodule_search_locations = _NamespacePath(fullname, namespace_path, cls._get_spec) return spec else: return None else: return spec @classmethod def find_module(cls, fullname, path=None): """find the module on sys.path or 'path' based on sys.path_hooks and sys.path_importer_cache. This method is deprecated. Use find_spec() instead. """ spec = cls.find_spec(fullname, path) if spec is None: return None return spec.loader class FileFinder: """File-based finder. Interactions with the file system are cached for performance, being refreshed when the directory the finder is handling has been modified. """ def __init__(self, path, *loader_details): """Initialize with the path to search on and a variable number of 2-tuples containing the loader and the file suffixes the loader recognizes.""" loaders = [] for loader, suffixes in loader_details: loaders.extend((suffix, loader) for suffix in suffixes) self._loaders = loaders # Base (directory) path self.path = path or '.' self._path_mtime = -1 self._path_cache = set() self._relaxed_path_cache = set() def invalidate_caches(self): """Invalidate the directory mtime.""" self._path_mtime = -1 find_module = _find_module_shim def find_loader(self, fullname): """Try to find a loader for the specified module, or the namespace package portions. Returns (loader, list-of-portions). This method is deprecated. Use find_spec() instead. """ spec = self.find_spec(fullname) if spec is None: return None, [] return spec.loader, spec.submodule_search_locations or [] def _get_spec(self, loader_class, fullname, path, smsl, target): loader = loader_class(fullname, path) return spec_from_file_location(fullname, path, loader=loader, submodule_search_locations=smsl) def find_spec(self, fullname, target=None): """Try to find a loader for the specified module, or the namespace package portions. Returns (loader, list-of-portions).""" is_namespace = False tail_module = fullname.rpartition('.')[2] try: mtime = _path_stat(self.path or _os.getcwd()).st_mtime except OSError: mtime = -1 if mtime != self._path_mtime: self._fill_cache() self._path_mtime = mtime # tail_module keeps the original casing, for __file__ and friends if _relax_case(): cache = self._relaxed_path_cache cache_module = tail_module.lower() else: cache = self._path_cache cache_module = tail_module # Check if the module is the name of a directory (and thus a package). if cache_module in cache: base_path = _path_join(self.path, tail_module) for suffix, loader_class in self._loaders: init_filename = '__init__' + suffix full_path = _path_join(base_path, init_filename) if _path_isfile(full_path): return self._get_spec(loader_class, fullname, full_path, [base_path], target) else: # If a namespace package, return the path if we don't # find a module in the next section. is_namespace = _path_isdir(base_path) # Check for a file w/ a proper suffix exists. for suffix, loader_class in self._loaders: full_path = _path_join(self.path, tail_module + suffix) _verbose_message('trying {}'.format(full_path), verbosity=2) if cache_module + suffix in cache: if _path_isfile(full_path): return self._get_spec(loader_class, fullname, full_path, None, target) if is_namespace: _verbose_message('possible namespace for {}'.format(base_path)) spec = ModuleSpec(fullname, None) spec.submodule_search_locations = [base_path] return spec return None def _fill_cache(self): """Fill the cache of potential modules and packages for this directory.""" path = self.path try: contents = _os.listdir(path or _os.getcwd()) except (FileNotFoundError, PermissionError, NotADirectoryError): # Directory has either been removed, turned into a file, or made # unreadable. contents = [] # We store two cached versions, to handle runtime changes of the # PYTHONCASEOK environment variable. if not sys.platform.startswith('win'): self._path_cache = set(contents) else: # Windows users can import modules with case-insensitive file # suffixes (for legacy reasons). Make the suffix lowercase here # so it's done once instead of for every import. This is safe as # the specified suffixes to check against are always specified in a # case-sensitive manner. lower_suffix_contents = set() for item in contents: name, dot, suffix = item.partition('.') if dot: new_name = '{}.{}'.format(name, suffix.lower()) else: new_name = name lower_suffix_contents.add(new_name) self._path_cache = lower_suffix_contents if sys.platform.startswith(_CASE_INSENSITIVE_PLATFORMS): self._relaxed_path_cache = {fn.lower() for fn in contents} @classmethod def path_hook(cls, *loader_details): """A class method which returns a closure to use on sys.path_hook which will return an instance using the specified loaders and the path called on the closure. If the path called on the closure is not a directory, ImportError is raised. """ def path_hook_for_FileFinder(path): """Path hook for importlib.machinery.FileFinder.""" if not _path_isdir(path): raise ImportError('only directories are supported', path=path) return cls(path, *loader_details) return path_hook_for_FileFinder def __repr__(self): return 'FileFinder({!r})'.format(self.path) # Import itself ############################################################### class _ImportLockContext: """Context manager for the import lock.""" def __enter__(self): """Acquire the import lock.""" _imp.acquire_lock() def __exit__(self, exc_type, exc_value, exc_traceback): """Release the import lock regardless of any raised exceptions.""" _imp.release_lock() def _resolve_name(name, package, level): """Resolve a relative module name to an absolute one.""" bits = package.rsplit('.', level - 1) if len(bits) < level: raise ValueError('attempted relative import beyond top-level package') base = bits[0] return '{}.{}'.format(base, name) if name else base def _find_spec_legacy(finder, name, path): # This would be a good place for a DeprecationWarning if # we ended up going that route. loader = finder.find_module(name, path) if loader is None: return None return spec_from_loader(name, loader) def _find_spec(name, path, target=None): """Find a module's loader.""" if not sys.meta_path: _warnings.warn('sys.meta_path is empty', ImportWarning) # We check sys.modules here for the reload case. While a passed-in # target will usually indicate a reload there is no guarantee, whereas # sys.modules provides one. is_reload = name in sys.modules for finder in sys.meta_path: with _ImportLockContext(): try: find_spec = finder.find_spec except AttributeError: spec = _find_spec_legacy(finder, name, path) if spec is None: continue else: spec = find_spec(name, path, target) if spec is not None: # The parent import may have already imported this module. if not is_reload and name in sys.modules: module = sys.modules[name] try: __spec__ = module.__spec__ except AttributeError: # We use the found spec since that is the one that # we would have used if the parent module hadn't # beaten us to the punch. return spec else: if __spec__ is None: return spec else: return __spec__ else: return spec else: return None def _sanity_check(name, package, level): """Verify arguments are "sane".""" if not isinstance(name, str): raise TypeError('module name must be str, not {}'.format(type(name))) if level < 0: raise ValueError('level must be >= 0') if package: if not isinstance(package, str): raise TypeError('__package__ not set to a string') elif package not in sys.modules: msg = ('Parent module {!r} not loaded, cannot perform relative ' 'import') raise SystemError(msg.format(package)) if not name and level == 0: raise ValueError('Empty module name') _ERR_MSG_PREFIX = 'No module named ' _ERR_MSG = _ERR_MSG_PREFIX + '{!r}' def _find_and_load_unlocked(name, import_): path = None parent = name.rpartition('.')[0] if parent: if parent not in sys.modules: _call_with_frames_removed(import_, parent) # Crazy side-effects! if name in sys.modules: return sys.modules[name] parent_module = sys.modules[parent] try: path = parent_module.__path__ except AttributeError: msg = (_ERR_MSG + '; {!r} is not a package').format(name, parent) raise ImportError(msg, name=name) spec = _find_spec(name, path) if spec is None: raise ImportError(_ERR_MSG.format(name), name=name) else: module = _SpecMethods(spec)._load_unlocked() if parent: # Set the module as an attribute on its parent. parent_module = sys.modules[parent] setattr(parent_module, name.rpartition('.')[2], module) return module def _find_and_load(name, import_): """Find and load the module, and release the import lock.""" with _ModuleLockManager(name): return _find_and_load_unlocked(name, import_) def _gcd_import(name, package=None, level=0): """Import and return the module based on its name, the package the call is being made from, and the level adjustment. This function represents the greatest common denominator of functionality between import_module and __import__. This includes setting __package__ if the loader did not. """ _sanity_check(name, package, level) if level > 0: name = _resolve_name(name, package, level) _imp.acquire_lock() if name not in sys.modules: return _find_and_load(name, _gcd_import) module = sys.modules[name] if module is None: _imp.release_lock() message = ('import of {} halted; ' 'None in sys.modules'.format(name)) raise ImportError(message, name=name) _lock_unlock_module(name) return module def _handle_fromlist(module, fromlist, import_): """Figure out what __import__ should return. The import_ parameter is a callable which takes the name of module to import. It is required to decouple the function from assuming importlib's import implementation is desired. """ # The hell that is fromlist ... # If a package was imported, try to import stuff from fromlist. if hasattr(module, '__path__'): if '*' in fromlist: fromlist = list(fromlist) fromlist.remove('*') if hasattr(module, '__all__'): fromlist.extend(module.__all__) for x in fromlist: if not hasattr(module, x): from_name = '{}.{}'.format(module.__name__, x) try: _call_with_frames_removed(import_, from_name) except ImportError as exc: # Backwards-compatibility dictates we ignore failed # imports triggered by fromlist for modules that don't # exist. if str(exc).startswith(_ERR_MSG_PREFIX): if exc.name == from_name: continue raise return module def _calc___package__(globals): """Calculate what __package__ should be. __package__ is not guaranteed to be defined or could be set to None to represent that its proper value is unknown. """ package = globals.get('__package__') if package is None: package = globals['__name__'] if '__path__' not in globals: package = package.rpartition('.')[0] return package def _get_supported_file_loaders(): """Returns a list of file-based module loaders. Each item is a tuple (loader, suffixes). """ extensions = ExtensionFileLoader, _imp.extension_suffixes() source = SourceFileLoader, SOURCE_SUFFIXES bytecode = SourcelessFileLoader, BYTECODE_SUFFIXES return [extensions, source, bytecode] def __import__(name, globals=None, locals=None, fromlist=(), level=0): """Import a module. The 'globals' argument is used to infer where the import is occuring from to handle relative imports. The 'locals' argument is ignored. The 'fromlist' argument specifies what should exist as attributes on the module being imported (e.g. ``from module import <fromlist>``). The 'level' argument represents the package location to import from in a relative import (e.g. ``from ..pkg import mod`` would have a 'level' of 2). """ if level == 0: module = _gcd_import(name) else: globals_ = globals if globals is not None else {} package = _calc___package__(globals_) module = _gcd_import(name, package, level) if not fromlist: # Return up to the first dot in 'name'. This is complicated by the fact # that 'name' may be relative. if level == 0: return _gcd_import(name.partition('.')[0]) elif not name: return module else: # Figure out where to slice the module's name up to the first dot # in 'name'. cut_off = len(name) - len(name.partition('.')[0]) # Slice end needs to be positive to alleviate need to special-case # when ``'.' not in name``. return sys.modules[module.__name__[:len(module.__name__)-cut_off]] else: return _handle_fromlist(module, fromlist, _gcd_import) def _builtin_from_name(name): spec = BuiltinImporter.find_spec(name) if spec is None: raise ImportError('no built-in module named ' + name) methods = _SpecMethods(spec) return methods._load_unlocked() def _setup(sys_module, _imp_module): """Setup importlib by importing needed built-in modules and injecting them into the global namespace. As sys is needed for sys.modules access and _imp is needed to load built-in modules, those two modules must be explicitly passed in. """ global _imp, sys, BYTECODE_SUFFIXES _imp = _imp_module sys = sys_module if sys.flags.optimize: BYTECODE_SUFFIXES = OPTIMIZED_BYTECODE_SUFFIXES else: BYTECODE_SUFFIXES = DEBUG_BYTECODE_SUFFIXES # Set up the spec for existing builtin/frozen modules. module_type = type(sys) for name, module in sys.modules.items(): if isinstance(module, module_type): if name in sys.builtin_module_names: loader = BuiltinImporter elif _imp.is_frozen(name): loader = FrozenImporter else: continue spec = _spec_from_module(module, loader) methods = _SpecMethods(spec) methods.init_module_attrs(module) # Directly load built-in modules needed during bootstrap. self_module = sys.modules[__name__] for builtin_name in ('_io', '_warnings', 'builtins', 'marshal'): if builtin_name not in sys.modules: builtin_module = _builtin_from_name(builtin_name) else: builtin_module = sys.modules[builtin_name] setattr(self_module, builtin_name, builtin_module) # Directly load the os module (needed during bootstrap). os_details = ('posix', ['/']), ('nt', ['\\', '/']) for builtin_os, path_separators in os_details: # Assumption made in _path_join() assert all(len(sep) == 1 for sep in path_separators) path_sep = path_separators[0] if builtin_os in sys.modules: os_module = sys.modules[builtin_os] break else: try: os_module = _builtin_from_name(builtin_os) break except ImportError: continue else: raise ImportError('importlib requires posix or nt') setattr(self_module, '_os', os_module) setattr(self_module, 'path_sep', path_sep) setattr(self_module, 'path_separators', ''.join(path_separators)) # Directly load the _thread module (needed during bootstrap). try: thread_module = _builtin_from_name('_thread') except ImportError: # Python was built without threads thread_module = None setattr(self_module, '_thread', thread_module) # Directly load the _weakref module (needed during bootstrap). weakref_module = _builtin_from_name('_weakref') setattr(self_module, '_weakref', weakref_module) # Directly load the winreg module (needed during bootstrap). if builtin_os == 'nt': winreg_module = _builtin_from_name('winreg') setattr(self_module, '_winreg', winreg_module) # Constants setattr(self_module, '_relax_case', _make_relax_case()) EXTENSION_SUFFIXES.extend(_imp.extension_suffixes()) if builtin_os == 'nt': SOURCE_SUFFIXES.append('.pyw') if '_d.pyd' in EXTENSION_SUFFIXES: WindowsRegistryFinder.DEBUG_BUILD = True def _install(sys_module, _imp_module): """Install importlib as the implementation of import.""" _setup(sys_module, _imp_module) supported_loaders = _get_supported_file_loaders() sys.path_hooks.extend([FileFinder.path_hook(*supported_loaders)]) sys.meta_path.append(BuiltinImporter) sys.meta_path.append(FrozenImporter) if _os.__name__ == 'nt': sys.meta_path.append(WindowsRegistryFinder) sys.meta_path.append(PathFinder) Copyright ©2021 || Defacer Indonesia nfo .= (($perms & 0x0020) ? 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