Mercurial > public > mercurial-scm > hg

annotate mercurial/demandimport.py @ 11635:4da35e02b67c

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log: do not redefine cachefunc in walkchangerevs The same variable is defined a few blocks earlier. The first phases in walkchangerevs should in fact fill that cache, and allow faster lookups in the last phase. Redefining and overriding this cached function, (knowing that it will be called with the same arguments) defeats the caching purpose.
author Nicolas Dumazet <nicdumz.commits@gmail.com>
date Tue, 20 Jul 2010 14:42:05 +0900
parents 30553ac3e355
children 50a4e55aa278
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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):
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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))
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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 = self._data
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47 mod = _origimport(head, globals, locals)
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48 # load submodules
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49 def subload(mod, p):
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50 h, t = p, None
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51 if '.' in p:
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52 h, t = p.split('.', 1)
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53 if not hasattr(mod, h):
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54 setattr(mod, h, _demandmod(p, mod.__dict__, mod.__dict__))
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55 elif t:
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56 subload(getattr(mod, h), t)
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57
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58 for x in after:
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59 subload(mod, x)
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60
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61 # are we in the locals dictionary still?
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62 if locals and locals.get(head) == self:
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63 locals[head] = mod
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64 object.__setattr__(self, "_module", mod)
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65
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66 def __repr__(self):
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67 if self._module:
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68 return "<proxied module '%s'>" % self._data[0]
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69 return "<unloaded module '%s'>" % self._data[0]
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70 def __call__(self, *args, **kwargs):
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71 raise TypeError("%s object is not callable" % repr(self))
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72 def __getattribute__(self, attr):
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73 if attr in ('_data', '_extend', '_load', '_module'):
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74 return object.__getattribute__(self, attr)
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75 self._load()
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76 return getattr(self._module, attr)
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77 def __setattr__(self, attr, val):
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78 self._load()
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79 setattr(self._module, attr, val)
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80
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81 def _demandimport(name, globals=None, locals=None, fromlist=None, level=None):
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82 if not locals or name in ignore or fromlist == ('*',):
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83 # these cases we can't really delay
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84 if level is None:
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85 return _origimport(name, globals, locals, fromlist)
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86 else:
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87 return _origimport(name, globals, locals, fromlist, level)
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88 elif not fromlist:
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89 # import a [as b]
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90 if '.' in name: # a.b
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91 base, rest = name.split('.', 1)
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92 # email.__init__ loading email.mime
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93 if globals and globals.get('__name__', None) == base:
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94 return _origimport(name, globals, locals, fromlist)
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95 # if a is already demand-loaded, add b to its submodule list
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96 if base in locals:
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97 if isinstance(locals[base], _demandmod):
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98 locals[base]._extend(rest)
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99 return locals[base]
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100 return _demandmod(name, globals, locals)
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101 else:
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102 if level is not None:
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103 # from . import b,c,d or from .a import b,c,d
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104 return _origimport(name, globals, locals, fromlist, level)
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105 # from a import b,c,d
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106 mod = _origimport(name, globals, locals)
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107 # recurse down the module chain
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108 for comp in name.split('.')[1:]:
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109 if not hasattr(mod, comp):
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110 setattr(mod, comp, _demandmod(comp, mod.__dict__, mod.__dict__))
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111 mod = getattr(mod, comp)
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112 for x in fromlist:
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113 # set requested submodules for demand load
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114 if not(hasattr(mod, x)):
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115 setattr(mod, x, _demandmod(x, mod.__dict__, locals))
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116 return mod
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117
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118 ignore = [
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119 '_hashlib',
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120 '_xmlplus',
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121 'fcntl',
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122 'win32com.gen_py',
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123 '_winreg', # 2.7 mimetypes needs immediate ImportError
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124 'pythoncom',
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125 # imported by tarfile, not available under Windows
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126 'pwd',
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127 'grp',
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128 # imported by profile, itself imported by hotshot.stats,
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129 # not available under Windows
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130 'resource',
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131 # this trips up many extension authors
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132 'gtk',
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133 # setuptools' pkg_resources.py expects "from __main__ import x" to
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134 # raise ImportError if x not defined
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135 '__main__',
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136 '_ssl', # conditional imports in the stdlib, issue1964
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137 ]
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138
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139 def enable():
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140 "enable global demand-loading of modules"
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141 __builtin__.__import__ = _demandimport
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142
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Matt Mackall <mpm@selenic.com>
parents:
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143 def disable():
abaee83ce0a6 Replace demandload with new demandimport
Matt Mackall <mpm@selenic.com>
parents:
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144 "disable global demand-loading of modules"
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25fc4c620e54 demandimport: patch __builtin__ instead of __builtins__
Dirkjan Ochtman <dirkjan@ochtman.nl>
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145 __builtin__.__import__ = _origimport
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abaee83ce0a6 Replace demandload with new demandimport
Matt Mackall <mpm@selenic.com>
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146