277 lines
9.3 KiB
Python
277 lines
9.3 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_builtin, init_frozen, is_builtin, is_frozen,
|
|
_fix_co_filename)
|
|
try:
|
|
from _imp import load_dynamic
|
|
except ImportError:
|
|
# Platform doesn't support dynamic loading.
|
|
load_dynamic = None
|
|
|
|
# Directly exposed by this module
|
|
from importlib._bootstrap import new_module
|
|
from importlib._bootstrap import cache_from_source, source_from_cache
|
|
|
|
|
|
from importlib import _bootstrap
|
|
from importlib import machinery
|
|
import os
|
|
import sys
|
|
import tokenize
|
|
import warnings
|
|
|
|
|
|
# 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 get_magic():
|
|
"""Return the magic number for .pyc or .pyo files."""
|
|
return _bootstrap._MAGIC_BYTES
|
|
|
|
|
|
def get_tag():
|
|
"""Return the magic tag for .pyc or .pyo files."""
|
|
return sys.implementation.cache_tag
|
|
|
|
|
|
def get_suffixes():
|
|
warnings.warn('imp.get_suffixes() is deprecated; use the constants '
|
|
'defined on importlib.machinery instead',
|
|
DeprecationWarning, 2)
|
|
extensions = [(s, 'rb', C_EXTENSION) for s in machinery.EXTENSION_SUFFIXES]
|
|
source = [(s, 'U', 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:
|
|
|
|
"""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:
|
|
|
|
"""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()."""
|
|
|
|
|
|
def load_source(name, pathname, file=None):
|
|
msg = ('imp.load_source() is deprecated; use '
|
|
'importlib.machinery.SourceFileLoader(name, pathname).load_module()'
|
|
' instead')
|
|
warnings.warn(msg, DeprecationWarning, 2)
|
|
_LoadSourceCompatibility(name, pathname, file).load_module(name)
|
|
module = sys.modules[name]
|
|
# To allow reloading to potentially work, use a non-hacked loader which
|
|
# won't rely on a now-closed file object.
|
|
module.__loader__ = _bootstrap.SourceFileLoader(name, pathname)
|
|
return module
|
|
|
|
|
|
class _LoadCompiledCompatibility(_HackedGetData,
|
|
_bootstrap.SourcelessFileLoader):
|
|
|
|
"""Compatibility support for implementing load_compiled()."""
|
|
|
|
|
|
def load_compiled(name, pathname, file=None):
|
|
msg = ('imp.load_compiled() is deprecated; use '
|
|
'importlib.machinery.SourcelessFileLoader(name, pathname).'
|
|
'load_module() instead ')
|
|
warnings.warn(msg, DeprecationWarning, 2)
|
|
_LoadCompiledCompatibility(name, pathname, file).load_module(name)
|
|
module = sys.modules[name]
|
|
# To allow reloading to potentially work, use a non-hacked loader which
|
|
# won't rely on a now-closed file object.
|
|
module.__loader__ = _bootstrap.SourcelessFileLoader(name, pathname)
|
|
return module
|
|
|
|
|
|
def load_package(name, path):
|
|
msg = ('imp.load_package() is deprecated; use either '
|
|
'importlib.machinery.SourceFileLoader() or '
|
|
'importlib.machinery.SourcelessFileLoader() instead')
|
|
warnings.warn(msg, DeprecationWarning, 2)
|
|
if os.path.isdir(path):
|
|
extensions = (machinery.SOURCE_SUFFIXES[:] +
|
|
machinery.BYTECODE_SUFFIXES[:])
|
|
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)
|
|
|
|
|
|
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
|
|
with warnings.catch_warnings():
|
|
warnings.simplefilter('ignore')
|
|
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("'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', 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)
|
|
with warnings.catch_warnings():
|
|
warnings.simplefilter('ignore')
|
|
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(_bootstrap._ERR_MSG.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_)
|
|
|
|
|
|
_RELOADING = {}
|
|
|
|
def reload(module):
|
|
"""Reload the module and return it.
|
|
|
|
The module must have been successfully imported before.
|
|
|
|
"""
|
|
if not module or type(module) != type(sys):
|
|
raise TypeError("reload() argument must be module")
|
|
name = module.__name__
|
|
if name not in sys.modules:
|
|
msg = "module {} not in sys.modules"
|
|
raise ImportError(msg.format(name), name=name)
|
|
if name in _RELOADING:
|
|
return _RELOADING[name]
|
|
_RELOADING[name] = module
|
|
try:
|
|
parent_name = name.rpartition('.')[0]
|
|
if parent_name and parent_name not in sys.modules:
|
|
msg = "parent {!r} not in sys.modules"
|
|
raise ImportError(msg.format(parent_name), name=parent_name)
|
|
return module.__loader__.load_module(name)
|
|
finally:
|
|
try:
|
|
del _RELOADING[name]
|
|
except KeyError:
|
|
pass
|