Mercurial > hg
annotate mercurial/demandimport.py @ 25803:b3004d273874
parser: factor out function that parses right-hand side of prefix/infix ops
These two had common pattern. The significant difference was just a result
expression:
prefix: (op-name, rhs)
infix: (op-name, lhs, rhs)
author | Yuya Nishihara <yuya@tcha.org> |
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date | Sun, 05 Jul 2015 18:09:15 +0900 |
parents | 5d0847cd1587 |
children | 1fc6c02782ab |
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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 |
10263 | 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 os, sys |
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28 from contextlib import contextmanager |
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29 |
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30 # __builtin__ in Python 2, builtins in Python 3. |
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31 try: |
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32 import __builtin__ as builtins |
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33 except ImportError: |
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34 import builtins |
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35 |
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36 _origimport = __import__ |
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37 |
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38 nothing = object() |
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39 |
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40 try: |
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41 # Python 3 doesn't have relative imports nor level -1. |
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42 level = -1 |
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43 if sys.version_info[0] >= 3: |
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44 level = 0 |
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45 _origimport(builtins.__name__, {}, {}, None, level) |
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46 except TypeError: # no level argument |
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47 def _import(name, globals, locals, fromlist, level): |
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48 "call _origimport with no level argument" |
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49 return _origimport(name, globals, locals, fromlist) |
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50 else: |
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51 _import = _origimport |
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52 |
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53 def _hgextimport(importfunc, name, globals, *args): |
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54 try: |
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55 return importfunc(name, globals, *args) |
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56 except ImportError: |
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57 if not globals: |
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58 raise |
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59 # extensions are loaded with "hgext_" prefix |
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60 hgextname = 'hgext_%s' % name |
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61 nameroot = hgextname.split('.', 1)[0] |
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62 contextroot = globals.get('__name__', '').split('.', 1)[0] |
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63 if nameroot != contextroot: |
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64 raise |
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65 # retry to import with "hgext_" prefix |
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66 return importfunc(hgextname, globals, *args) |
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67 |
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68 class _demandmod(object): |
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69 """module demand-loader and proxy""" |
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70 def __init__(self, name, globals, locals, level=level): |
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71 if '.' in name: |
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72 head, rest = name.split('.', 1) |
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73 after = [rest] |
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74 else: |
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75 head = name |
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76 after = [] |
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77 object.__setattr__(self, "_data", |
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78 (head, globals, locals, after, level)) |
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79 object.__setattr__(self, "_module", None) |
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80 def _extend(self, name): |
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81 """add to the list of submodules to load""" |
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82 self._data[3].append(name) |
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83 def _load(self): |
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84 if not self._module: |
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85 head, globals, locals, after, level = self._data |
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86 mod = _hgextimport(_import, head, globals, locals, None, level) |
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87 # load submodules |
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88 def subload(mod, p): |
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89 h, t = p, None |
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90 if '.' in p: |
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91 h, t = p.split('.', 1) |
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92 if getattr(mod, h, nothing) is nothing: |
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93 setattr(mod, h, _demandmod(p, mod.__dict__, mod.__dict__)) |
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94 elif t: |
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95 subload(getattr(mod, h), t) |
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96 |
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97 for x in after: |
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98 subload(mod, x) |
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99 |
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100 # are we in the locals dictionary still? |
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101 if locals and locals.get(head) == self: |
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102 locals[head] = mod |
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103 object.__setattr__(self, "_module", mod) |
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104 |
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105 def __repr__(self): |
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106 if self._module: |
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107 return "<proxied module '%s'>" % self._data[0] |
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108 return "<unloaded module '%s'>" % self._data[0] |
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109 def __call__(self, *args, **kwargs): |
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110 raise TypeError("%s object is not callable" % repr(self)) |
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111 def __getattribute__(self, attr): |
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112 if attr in ('_data', '_extend', '_load', '_module'): |
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113 return object.__getattribute__(self, attr) |
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114 self._load() |
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115 return getattr(self._module, attr) |
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116 def __setattr__(self, attr, val): |
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117 self._load() |
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118 setattr(self._module, attr, val) |
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119 |
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120 def _demandimport(name, globals=None, locals=None, fromlist=None, level=level): |
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121 if not locals or name in ignore or fromlist == ('*',): |
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122 # these cases we can't really delay |
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123 return _hgextimport(_import, name, globals, locals, fromlist, level) |
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124 elif not fromlist: |
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125 # import a [as b] |
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126 if '.' in name: # a.b |
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127 base, rest = name.split('.', 1) |
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128 # email.__init__ loading email.mime |
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129 if globals and globals.get('__name__', None) == base: |
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130 return _import(name, globals, locals, fromlist, level) |
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131 # if a is already demand-loaded, add b to its submodule list |
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132 if base in locals: |
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133 if isinstance(locals[base], _demandmod): |
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134 locals[base]._extend(rest) |
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135 return locals[base] |
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136 return _demandmod(name, globals, locals, level) |
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137 else: |
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138 if level != -1: |
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139 # from . import b,c,d or from .a import b,c,d |
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140 return _origimport(name, globals, locals, fromlist, level) |
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141 # from a import b,c,d |
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142 mod = _hgextimport(_origimport, name, globals, locals) |
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143 # recurse down the module chain |
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144 for comp in name.split('.')[1:]: |
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145 if getattr(mod, comp, nothing) is nothing: |
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146 setattr(mod, comp, _demandmod(comp, mod.__dict__, mod.__dict__)) |
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147 mod = getattr(mod, comp) |
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148 for x in fromlist: |
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149 # set requested submodules for demand load |
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150 if getattr(mod, x, nothing) is nothing: |
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151 setattr(mod, x, _demandmod(x, mod.__dict__, locals)) |
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152 return mod |
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153 |
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154 ignore = [ |
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155 '_hashlib', |
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156 '_xmlplus', |
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157 'fcntl', |
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158 'win32com.gen_py', |
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159 '_winreg', # 2.7 mimetypes needs immediate ImportError |
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160 'pythoncom', |
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161 # imported by tarfile, not available under Windows |
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162 'pwd', |
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163 'grp', |
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164 # imported by profile, itself imported by hotshot.stats, |
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165 # not available under Windows |
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166 'resource', |
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168 'gtk', | |
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169 # setuptools' pkg_resources.py expects "from __main__ import x" to |
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170 # raise ImportError if x not defined |
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171 '__main__', |
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172 '_ssl', # conditional imports in the stdlib, issue1964 |
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173 'rfc822', |
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174 'mimetools', |
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175 # setuptools 8 expects this module to explode early when not on windows |
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176 'distutils.msvc9compiler' |
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177 ] |
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178 |
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179 def isenabled(): |
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180 return builtins.__import__ == _demandimport |
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181 |
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182 def enable(): |
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183 "enable global demand-loading of modules" |
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184 if os.environ.get('HGDEMANDIMPORT') != 'disable': |
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185 builtins.__import__ = _demandimport |
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186 |
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187 def disable(): |
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188 "disable global demand-loading of modules" |
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189 builtins.__import__ = _origimport |
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190 |
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191 @contextmanager |
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192 def deactivated(): |
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193 "context manager for disabling demandimport in 'with' blocks" |
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194 demandenabled = isenabled() |
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195 if demandenabled: |
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196 disable() |
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197 |
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198 try: |
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199 yield |
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200 finally: |
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201 if demandenabled: |
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202 enable() |