blob: 7474350f888718a08dd06b9032f5ff08fe2781d1 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
|
"""A pure Python implementation of import.
References on import:
* Language reference
http://docs.python.org/ref/import.html
* __import__ function
http://docs.python.org/lib/built-in-funcs.html
* Packages
http://www.python.org/doc/essays/packages.html
* PEP 235: Import on Case-Insensitive Platforms
http://www.python.org/dev/peps/pep-0235
* PEP 275: Import Modules from Zip Archives
http://www.python.org/dev/peps/pep-0273
* PEP 302: New Import Hooks
http://www.python.org/dev/peps/pep-0302/
* PEP 328: Imports: Multi-line and Absolute/Relative
http://www.python.org/dev/peps/pep-0328
"""
__all__ = ['__import__', 'import_module']
from . import _bootstrap
import os
import re
import tokenize
# XXX Temporary functions that should eventually be removed.
def _set__import__():
"""Set __import__ to an instance of Import."""
global original__import__
original__import__ = __import__
__builtins__['__import__'] = _bootstrap._import
def _reset__import__():
"""Set __import__ back to the original implementation (assumes
_set__import__ was called previously)."""
__builtins__['__import__'] = original__import__
# Bootstrap help #####################################################
def _case_ok(directory, check):
"""Check if the directory contains something matching 'check'.
No check is done if the file/directory exists or not.
"""
if 'PYTHONCASEOK' in os.environ:
return True
elif check in os.listdir(directory):
return True
return False
def _w_long(x):
"""Convert a 32-bit integer to little-endian.
XXX Temporary until marshal's long functions are exposed.
"""
x = int(x)
int_bytes = []
int_bytes.append(x & 0xFF)
int_bytes.append((x >> 8) & 0xFF)
int_bytes.append((x >> 16) & 0xFF)
int_bytes.append((x >> 24) & 0xFF)
return bytearray(int_bytes)
def _r_long(int_bytes):
"""Convert 4 bytes in little-endian to an integer.
XXX Temporary until marshal's long function are exposed.
"""
x = int_bytes[0]
x |= int_bytes[1] << 8
x |= int_bytes[2] << 16
x |= int_bytes[3] << 24
return x
# Required built-in modules.
try:
import posix as _os
except ImportError:
try:
import nt as _os
except ImportError:
try:
import os2 as _os
except ImportError:
raise ImportError('posix, nt, or os2 module required for importlib')
_bootstrap._os = _os
import imp, sys, marshal, errno, _io
_bootstrap.imp = imp
_bootstrap.sys = sys
_bootstrap.marshal = marshal
_bootstrap.errno = errno
_bootstrap._io = _io
import _warnings
_bootstrap._warnings = _warnings
from os import sep
# For os.path.join replacement; pull from Include/osdefs.h:SEP .
_bootstrap.path_sep = sep
_bootstrap._case_ok = _case_ok
marshal._w_long = _w_long
marshal._r_long = _r_long
# Public API #########################################################
__import__ = _bootstrap._import
def import_module(name, package=None):
"""Import a module.
The 'package' argument is required when performing a relative import. It
specifies the package to use as the anchor point from which to resolve the
relative import to an absolute import.
"""
level = 0
if name.startswith('.'):
if not package:
raise TypeError("relative imports require the 'package' argument")
for character in name:
if character != '.':
break
level += 1
return _bootstrap._gcd_import(name[level:], package, level)
|
