"""This module provides the components needed to build your own __import__ function. Undocumented functions are obsolete. In most cases it is preferred you consider using the importlib module's functionality over this module. """ # (Probably) need to stay in _imp from _imp import (lock_held, acquire_lock, release_lock, reload, load_dynamic, get_frozen_object, is_frozen_package, init_builtin, init_frozen, is_builtin, is_frozen, _fix_co_filename) # Could move out of _imp, but not worth the code from _imp import get_magic, get_tag # Can (probably) move to importlib from _imp import get_suffixes # Should be re-implemented here (and mostly deprecated) from _imp import NullImporter from importlib._bootstrap import _new_module as new_module from importlib._bootstrap import _cache_from_source as cache_from_source from importlib import _bootstrap import os import sys import tokenize # XXX "deprecate" once find_module(), load_module(), and get_suffixes() are # deprecated. SEARCH_ERROR = 0 PY_SOURCE = 1 PY_COMPILED = 2 C_EXTENSION = 3 PY_RESOURCE = 4 PKG_DIRECTORY = 5 C_BUILTIN = 6 PY_FROZEN = 7 PY_CODERESOURCE = 8 IMP_HOOK = 9 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. """ head, pycache_filename = os.path.split(path) head, pycache = os.path.split(head) if pycache != _bootstrap.PYCACHE: raise ValueError('{} not bottom-level directory in ' '{!r}'.format(_bootstrap.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 os.path.join(head, base_filename + _bootstrap.SOURCE_SUFFIXES[0]) class _HackedGetData: """Compatibiilty support for 'file' arguments of various load_*() functions.""" def __init__(self, fullname, path, file=None): super().__init__(fullname, path) self.file = file def get_data(self, path): """Gross hack to contort loader to deal w/ load_*()'s bad API.""" if self.file and path == self.path: with self.file: # Technically should be returning bytes, but # SourceLoader.get_code() just passed what is returned to # compile() which can handle str. And converting to bytes would # require figuring out the encoding to decode to and # tokenize.detect_encoding() only accepts bytes. return self.file.read() else: return super().get_data(path) class _LoadSourceCompatibility(_HackedGetData, _bootstrap.SourceFileLoader): """Compatibility support for implementing load_source().""" # XXX deprecate after better API exposed in importlib def load_source(name, pathname, file=None): return _LoadSourceCompatibility(name, pathname, file).load_module(name) class _LoadCompiledCompatibility(_HackedGetData, _bootstrap.SourcelessFileLoader): """Compatibility support for implementing load_compiled().""" # XXX deprecate def load_compiled(name, pathname, file=None): return _LoadCompiledCompatibility(name, pathname, file).load_module(name) # XXX deprecate def load_package(name, path): if os.path.isdir(path): extensions = _bootstrap._suffix_list(PY_SOURCE) extensions += _bootstrap._suffix_list(PY_COMPILED) for extension in extensions: path = os.path.join(path, '__init__'+extension) if os.path.exists(path): break else: raise ValueError('{!r} is not a package'.format(path)) return _bootstrap.SourceFileLoader(name, path).load_module(name) # XXX deprecate def load_module(name, file, filename, details): """Load a module, given information returned by find_module(). The module name must include the full package name, if any. """ suffix, mode, type_ = details if mode and (not mode.startswith(('r', 'U')) or '+' in mode): raise ValueError('invalid file open mode {!r}'.format(mode)) elif file is None and type_ in {PY_SOURCE, PY_COMPILED}: msg = 'file object required for import (type code {})'.format(type_) raise ValueError(msg) elif type_ == PY_SOURCE: return load_source(name, filename, file) elif type_ == PY_COMPILED: return load_compiled(name, filename, file) elif type_ == PKG_DIRECTORY: return load_package(name, filename) elif type_ == C_BUILTIN: return init_builtin(name) elif type_ == PY_FROZEN: return init_frozen(name) else: msg = "Don't know how to import {} (type code {}".format(name, type_) raise ImportError(msg, name=name) def find_module(name, path=None): """Search for a module. If path is omitted or None, search for a built-in, frozen or special module and continue search in sys.path. The module name cannot contain '.'; to search for a submodule of a package, pass the submodule name and the package's __path__. """ if not isinstance(name, str): raise TypeError("'name' must be a str, not {}".format(type(name))) elif not isinstance(path, (type(None), list)): # Backwards-compatibility raise RuntimeError("'list' must be None or a list, " "not {}".format(type(name))) if path is None: if is_builtin(name): return None, None, ('', '', C_BUILTIN) elif is_frozen(name): return None, None, ('', '', PY_FROZEN) else: path = sys.path for entry in path: package_directory = os.path.join(entry, name) for suffix in ['.py', _bootstrap.BYTECODE_SUFFIX]: package_file_name = '__init__' + suffix file_path = os.path.join(package_directory, package_file_name) if os.path.isfile(file_path): return None, package_directory, ('', '', PKG_DIRECTORY) for suffix, mode, type_ in get_suffixes(): file_name = name + suffix file_path = os.path.join(entry, file_name) if os.path.isfile(file_path): break else: continue break # Break out of outer loop when breaking out of inner loop. else: raise ImportError('No module name {!r}'.format(name), name=name) encoding = None if mode == 'U': with open(file_path, 'rb') as file: encoding = tokenize.detect_encoding(file.readline)[0] file = open(file_path, mode, encoding=encoding) return file, file_path, (suffix, mode, type_)