mirror of https://github.com/python/cpython.git
346 lines
10 KiB
Python
346 lines
10 KiB
Python
"""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,
|
|
get_frozen_object, is_frozen_package,
|
|
init_frozen, is_builtin, is_frozen,
|
|
_fix_co_filename)
|
|
try:
|
|
from _imp import create_dynamic
|
|
except ImportError:
|
|
# Platform doesn't support dynamic loading.
|
|
create_dynamic = None
|
|
|
|
from importlib._bootstrap import _ERR_MSG, _exec, _load, _builtin_from_name
|
|
from importlib._bootstrap_external import SourcelessFileLoader
|
|
|
|
from importlib import machinery
|
|
from importlib import util
|
|
import importlib
|
|
import os
|
|
import sys
|
|
import tokenize
|
|
import types
|
|
import warnings
|
|
|
|
warnings.warn("the imp module is deprecated in favour of importlib; "
|
|
"see the module's documentation for alternative uses",
|
|
DeprecationWarning, stacklevel=2)
|
|
|
|
# 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 new_module(name):
|
|
"""**DEPRECATED**
|
|
|
|
Create a new module.
|
|
|
|
The module is not entered into sys.modules.
|
|
|
|
"""
|
|
return types.ModuleType(name)
|
|
|
|
|
|
def get_magic():
|
|
"""**DEPRECATED**
|
|
|
|
Return the magic number for .pyc files.
|
|
"""
|
|
return util.MAGIC_NUMBER
|
|
|
|
|
|
def get_tag():
|
|
"""Return the magic tag for .pyc files."""
|
|
return sys.implementation.cache_tag
|
|
|
|
|
|
def cache_from_source(path, debug_override=None):
|
|
"""**DEPRECATED**
|
|
|
|
Given the path to a .py file, return the path to its .pyc file.
|
|
|
|
The .py file does not need to exist; this simply returns the path to the
|
|
.pyc file calculated as if the .py file were imported.
|
|
|
|
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.
|
|
|
|
"""
|
|
with warnings.catch_warnings():
|
|
warnings.simplefilter('ignore')
|
|
return util.cache_from_source(path, debug_override)
|
|
|
|
|
|
def source_from_cache(path):
|
|
"""**DEPRECATED**
|
|
|
|
Given the path to a .pyc. file, return the path to its .py file.
|
|
|
|
The .pyc file does not need to exist; this simply returns the path to
|
|
the .py file calculated to correspond to the .pyc 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.
|
|
|
|
"""
|
|
return util.source_from_cache(path)
|
|
|
|
|
|
def get_suffixes():
|
|
"""**DEPRECATED**"""
|
|
extensions = [(s, 'rb', C_EXTENSION) for s in machinery.EXTENSION_SUFFIXES]
|
|
source = [(s, 'r', PY_SOURCE) for s in machinery.SOURCE_SUFFIXES]
|
|
bytecode = [(s, 'rb', PY_COMPILED) for s in machinery.BYTECODE_SUFFIXES]
|
|
|
|
return extensions + source + bytecode
|
|
|
|
|
|
class NullImporter:
|
|
|
|
"""**DEPRECATED**
|
|
|
|
Null import object.
|
|
|
|
"""
|
|
|
|
def __init__(self, path):
|
|
if path == '':
|
|
raise ImportError('empty pathname', path='')
|
|
elif os.path.isdir(path):
|
|
raise ImportError('existing directory', path=path)
|
|
|
|
def find_module(self, fullname):
|
|
"""Always returns None."""
|
|
return None
|
|
|
|
|
|
class _HackedGetData:
|
|
|
|
"""Compatibility 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:
|
|
# The contract of get_data() requires us to return bytes. Reopen the
|
|
# file in binary mode if needed.
|
|
if not self.file.closed:
|
|
file = self.file
|
|
if 'b' not in file.mode:
|
|
file.close()
|
|
if self.file.closed:
|
|
self.file = file = open(self.path, 'rb')
|
|
|
|
with file:
|
|
return file.read()
|
|
else:
|
|
return super().get_data(path)
|
|
|
|
|
|
class _LoadSourceCompatibility(_HackedGetData, machinery.SourceFileLoader):
|
|
|
|
"""Compatibility support for implementing load_source()."""
|
|
|
|
|
|
def load_source(name, pathname, file=None):
|
|
loader = _LoadSourceCompatibility(name, pathname, file)
|
|
spec = util.spec_from_file_location(name, pathname, loader=loader)
|
|
if name in sys.modules:
|
|
module = _exec(spec, sys.modules[name])
|
|
else:
|
|
module = _load(spec)
|
|
# To allow reloading to potentially work, use a non-hacked loader which
|
|
# won't rely on a now-closed file object.
|
|
module.__loader__ = machinery.SourceFileLoader(name, pathname)
|
|
module.__spec__.loader = module.__loader__
|
|
return module
|
|
|
|
|
|
class _LoadCompiledCompatibility(_HackedGetData, SourcelessFileLoader):
|
|
|
|
"""Compatibility support for implementing load_compiled()."""
|
|
|
|
|
|
def load_compiled(name, pathname, file=None):
|
|
"""**DEPRECATED**"""
|
|
loader = _LoadCompiledCompatibility(name, pathname, file)
|
|
spec = util.spec_from_file_location(name, pathname, loader=loader)
|
|
if name in sys.modules:
|
|
module = _exec(spec, sys.modules[name])
|
|
else:
|
|
module = _load(spec)
|
|
# To allow reloading to potentially work, use a non-hacked loader which
|
|
# won't rely on a now-closed file object.
|
|
module.__loader__ = SourcelessFileLoader(name, pathname)
|
|
module.__spec__.loader = module.__loader__
|
|
return module
|
|
|
|
|
|
def load_package(name, path):
|
|
"""**DEPRECATED**"""
|
|
if os.path.isdir(path):
|
|
extensions = (machinery.SOURCE_SUFFIXES[:] +
|
|
machinery.BYTECODE_SUFFIXES[:])
|
|
for extension in extensions:
|
|
init_path = os.path.join(path, '__init__' + extension)
|
|
if os.path.exists(init_path):
|
|
path = init_path
|
|
break
|
|
else:
|
|
raise ValueError('{!r} is not a package'.format(path))
|
|
spec = util.spec_from_file_location(name, path,
|
|
submodule_search_locations=[])
|
|
if name in sys.modules:
|
|
return _exec(spec, sys.modules[name])
|
|
else:
|
|
return _load(spec)
|
|
|
|
|
|
def load_module(name, file, filename, details):
|
|
"""**DEPRECATED**
|
|
|
|
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_ == C_EXTENSION and load_dynamic is not None:
|
|
if file is None:
|
|
with open(filename, 'rb') as opened_file:
|
|
return load_dynamic(name, filename, opened_file)
|
|
else:
|
|
return load_dynamic(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):
|
|
"""**DEPRECATED**
|
|
|
|
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("'path' must be None or a list, "
|
|
"not {}".format(type(path)))
|
|
|
|
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', machinery.BYTECODE_SUFFIXES[0]]:
|
|
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(_ERR_MSG.format(name), name=name)
|
|
|
|
encoding = None
|
|
if 'b' not in mode:
|
|
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_)
|
|
|
|
|
|
def reload(module):
|
|
"""**DEPRECATED**
|
|
|
|
Reload the module and return it.
|
|
|
|
The module must have been successfully imported before.
|
|
|
|
"""
|
|
return importlib.reload(module)
|
|
|
|
|
|
def init_builtin(name):
|
|
"""**DEPRECATED**
|
|
|
|
Load and return a built-in module by name, or None is such module doesn't
|
|
exist
|
|
"""
|
|
try:
|
|
return _builtin_from_name(name)
|
|
except ImportError:
|
|
return None
|
|
|
|
|
|
if create_dynamic:
|
|
def load_dynamic(name, path, file=None):
|
|
"""**DEPRECATED**
|
|
|
|
Load an extension module.
|
|
"""
|
|
import importlib.machinery
|
|
loader = importlib.machinery.ExtensionFileLoader(name, path)
|
|
|
|
# Issue #24748: Skip the sys.modules check in _load_module_shim;
|
|
# always load new extension
|
|
spec = importlib.machinery.ModuleSpec(
|
|
name=name, loader=loader, origin=path)
|
|
return _load(spec)
|
|
|
|
else:
|
|
load_dynamic = None
|