Mercurial > public > mercurial-scm > hg-stable

annotate mercurial/demandimport.py @ 12686:fe31f834a9ff

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demandimport: fix an obscure corner-case. Python's __import__() function has 'level' as the fourth argument, not the third. The code path in question probably never worked. (This was seen trying to run Mercurial in PyPy. Fixing this made it die somewhere else...)
author Dan Villiom Podlaski Christiansen <danchr@gmail.com>
date Tue, 14 Sep 2010 23:00:39 +0200
parents 50a4e55aa278
children cddea24aafed
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1 # demandimport.py - global demand-loading of modules for Mercurial
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2 #
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3 # Copyright 2006, 2007 Matt Mackall <mpm@selenic.com>
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4 #
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5 # This software may be used and distributed according to the terms of the
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6 # GNU General Public License version 2 or any later version.
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7
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8 '''
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9 demandimport - automatic demandloading of modules
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10
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11 To enable this module, do:
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12
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13 import demandimport; demandimport.enable()
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14
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15 Imports of the following forms will be demand-loaded:
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16
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17 import a, b.c
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18 import a.b as c
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19 from a import b,c # a will be loaded immediately
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20
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21 These imports will not be delayed:
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22
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23 from a import *
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24 b = __import__(a)
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25 '''
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26
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27 import __builtin__
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28 _origimport = __import__
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29
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30 class _demandmod(object):
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31 """module demand-loader and proxy"""
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32 def __init__(self, name, globals, locals, level):
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33 if '.' in name:
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34 head, rest = name.split('.', 1)
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35 after = [rest]
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36 else:
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37 head = name
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38 after = []
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39 object.__setattr__(self, "_data", (head, globals, locals, after, level))
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40 object.__setattr__(self, "_module", None)
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41 def _extend(self, name):
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42 """add to the list of submodules to load"""
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43 self._data[3].append(name)
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44 def _load(self):
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45 if not self._module:
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46 head, globals, locals, after, level = self._data
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47 if level is not None:
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48 mod = _origimport(head, globals, locals, level=level)
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49 else:
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50 mod = _origimport(head, globals, locals)
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51 # load submodules
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52 def subload(mod, p):
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53 h, t = p, None
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54 if '.' in p:
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55 h, t = p.split('.', 1)
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56 if not hasattr(mod, h):
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57 # TODO: should we adjust the level here?
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58 submod = _demandmod(p, mod.__dict__, mod.__dict__,
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59 level=level)
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60 setattr(mod, h, submod)
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61 elif t:
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62 subload(getattr(mod, h), t)
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63
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64 for x in after:
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65 subload(mod, x)
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66
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67 # are we in the locals dictionary still?
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68 if locals and locals.get(head) == self:
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69 locals[head] = mod
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70 object.__setattr__(self, "_module", mod)
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71
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72 def __repr__(self):
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73 if self._module:
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74 return "<proxied module '%s'>" % self._data[0]
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75 return "<unloaded module '%s'>" % self._data[0]
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76 def __call__(self, *args, **kwargs):
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77 raise TypeError("%s object is not callable" % repr(self))
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78 def __getattribute__(self, attr):
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79 if attr in ('_data', '_extend', '_load', '_module'):
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80 return object.__getattribute__(self, attr)
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81 self._load()
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82 return getattr(self._module, attr)
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83 def __setattr__(self, attr, val):
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84 self._load()
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85 setattr(self._module, attr, val)
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86
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87 def _demandimport(name, globals=None, locals=None, fromlist=None, level=None):
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88 if not locals or name in ignore or fromlist == ('*',):
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89 # these cases we can't really delay
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90 if level is None:
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91 return _origimport(name, globals, locals, fromlist)
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92 else:
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93 return _origimport(name, globals, locals, fromlist, level)
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94 elif not fromlist:
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95 # import a [as b]
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96 if '.' in name: # a.b
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97 base, rest = name.split('.', 1)
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98 # email.__init__ loading email.mime
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99 if globals and globals.get('__name__', None) == base:
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100 if level is not None:
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101 return _origimport(name, globals, locals, fromlist, level)
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102 else:
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103 return _origimport(name, globals, locals, fromlist)
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104 # if a is already demand-loaded, add b to its submodule list
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105 if base in locals:
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106 if isinstance(locals[base], _demandmod):
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107 locals[base]._extend(rest)
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108 return locals[base]
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109 return _demandmod(name, globals, locals, level=level)
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110 else:
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111 # from a import b,c,d
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112 if level is not None:
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113 mod = _origimport(name, globals, locals, level=level)
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114 else:
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115 mod = _origimport(name, globals, locals)
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116 # recurse down the module chain
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117 for comp in name.split('.')[1:]:
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118 if not hasattr(mod, comp):
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119 # TODO: should we adjust the level here?
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120 submod = _demandmod(comp, mod.__dict__, mod.__dict__,
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121 level=level)
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122 setattr(mod, comp, submod)
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123 mod = getattr(mod, comp)
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124 for x in fromlist:
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125 # set requested submodules for demand load
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126 if not(hasattr(mod, x)):
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127 # TODO: should we adjust the level here?
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128 submod = _demandmod(x, mod.__dict__, locals, level=level)
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129 setattr(mod, x, submod)
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130 return mod
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131
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132 ignore = [
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133 '_hashlib',
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134 '_xmlplus',
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135 'fcntl',
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136 'win32com.gen_py',
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137 '_winreg', # 2.7 mimetypes needs immediate ImportError
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138 'pythoncom',
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Patrick Mezard <pmezard@gmail.com>
parents: 5097
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139 # imported by tarfile, not available under Windows
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Patrick Mezard <pmezard@gmail.com>
parents: 5097
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140 'pwd',
0bbd86b847dd demandimport: ignore resource module, not available under Windows.
Patrick Mezard <pmezard@gmail.com>
parents: 5097
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141 'grp',
0bbd86b847dd demandimport: ignore resource module, not available under Windows.
Patrick Mezard <pmezard@gmail.com>
parents: 5097
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142 # imported by profile, itself imported by hotshot.stats,
0bbd86b847dd demandimport: ignore resource module, not available under Windows.
Patrick Mezard <pmezard@gmail.com>
parents: 5097
diff changeset
143 # not available under Windows
0bbd86b847dd demandimport: ignore resource module, not available under Windows.
Patrick Mezard <pmezard@gmail.com>
parents: 5097
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144 'resource',
9458
ffeaf5ba25d8 demandimport: blacklist gtk
Steve Borho <steve@borho.org>
parents: 9315
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145 # this trips up many extension authors
ffeaf5ba25d8 demandimport: blacklist gtk
Steve Borho <steve@borho.org>
parents: 9315
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146 'gtk',
10598
1037bd445768 demandimport: add __main__ to the blacklist (because of setuptools)
Greg Ward <greg-hg@gerg.ca>
parents: 10263
diff changeset
147 # setuptools' pkg_resources.py expects "from __main__ import x" to
1037bd445768 demandimport: add __main__ to the blacklist (because of setuptools)
Greg Ward <greg-hg@gerg.ca>
parents: 10263
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148 # raise ImportError if x not defined
1037bd445768 demandimport: add __main__ to the blacklist (because of setuptools)
Greg Ward <greg-hg@gerg.ca>
parents: 10263
diff changeset
149 '__main__',
10612
30553ac3e355 demandimport: blacklist _ssl (issue1964)
Dirkjan Ochtman <dirkjan@ochtman.nl>
parents: 10598
diff changeset
150 '_ssl', # conditional imports in the stdlib, issue1964
5098
0bbd86b847dd demandimport: ignore resource module, not available under Windows.
Patrick Mezard <pmezard@gmail.com>
parents: 5097
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151 ]
3877
abaee83ce0a6 Replace demandload with new demandimport
Matt Mackall <mpm@selenic.com>
parents:
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152
abaee83ce0a6 Replace demandload with new demandimport
Matt Mackall <mpm@selenic.com>
parents:
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153 def enable():
abaee83ce0a6 Replace demandload with new demandimport
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
154 "enable global demand-loading of modules"
7727
25fc4c620e54 demandimport: patch __builtin__ instead of __builtins__
Dirkjan Ochtman <dirkjan@ochtman.nl>
parents: 5929
diff changeset
155 __builtin__.__import__ = _demandimport
3877
abaee83ce0a6 Replace demandload with new demandimport
Matt Mackall <mpm@selenic.com>
parents:
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156
abaee83ce0a6 Replace demandload with new demandimport
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
157 def disable():
abaee83ce0a6 Replace demandload with new demandimport
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
158 "disable global demand-loading of modules"
7727
25fc4c620e54 demandimport: patch __builtin__ instead of __builtins__
Dirkjan Ochtman <dirkjan@ochtman.nl>
parents: 5929
diff changeset
159 __builtin__.__import__ = _origimport
3877
abaee83ce0a6 Replace demandload with new demandimport
Matt Mackall <mpm@selenic.com>
parents:
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160