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103 lines
2.7 KiB
Python
103 lines
2.7 KiB
Python
"""A pure Python implementation of import.
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References on import:
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* Language reference
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http://docs.python.org/ref/import.html
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* __import__ function
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http://docs.python.org/lib/built-in-funcs.html
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* Packages
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http://www.python.org/doc/essays/packages.html
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* PEP 235: Import on Case-Insensitive Platforms
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http://www.python.org/dev/peps/pep-0235
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* PEP 275: Import Modules from Zip Archives
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http://www.python.org/dev/peps/pep-0273
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* PEP 302: New Import Hooks
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http://www.python.org/dev/peps/pep-0302/
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* PEP 328: Imports: Multi-line and Absolute/Relative
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http://www.python.org/dev/peps/pep-0328
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"""
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__all__ = ['__import__', 'import_module']
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from . import _bootstrap
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import os
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import re
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import tokenize
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# To simplify imports in test code
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_w_long = _bootstrap._w_long
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_r_long = _bootstrap._r_long
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# Bootstrap help #####################################################
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# TODO: Expose from import.c, else handle encode/decode as _os.environ returns
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# bytes.
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def _case_ok(directory, check):
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"""Check if the directory contains something matching 'check'.
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No check is done if the file/directory exists or not.
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"""
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if 'PYTHONCASEOK' in os.environ:
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return True
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if not directory:
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directory = os.getcwd()
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if check in os.listdir(directory):
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return True
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return False
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_bootstrap._case_ok = _case_ok
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# Required built-in modules.
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try:
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import posix as _os
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except ImportError:
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try:
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import nt as _os
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except ImportError:
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try:
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import os2 as _os
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except ImportError:
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raise ImportError('posix, nt, or os2 module required for importlib')
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_bootstrap._os = _os
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import imp, sys, marshal, _io
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_bootstrap.imp = imp
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_bootstrap.sys = sys
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_bootstrap.marshal = marshal
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_bootstrap._io = _io
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import _warnings
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_bootstrap._warnings = _warnings
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from os import sep
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# For os.path.join replacement; pull from Include/osdefs.h:SEP .
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_bootstrap.path_sep = sep
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# Public API #########################################################
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from ._bootstrap import __import__
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def import_module(name, package=None):
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"""Import a module.
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The 'package' argument is required when performing a relative import. It
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specifies the package to use as the anchor point from which to resolve the
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relative import to an absolute import.
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"""
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level = 0
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if name.startswith('.'):
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if not package:
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raise TypeError("relative imports require the 'package' argument")
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for character in name:
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if character != '.':
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break
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level += 1
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return _bootstrap._gcd_import(name[level:], package, level)
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