Mercurial > hg
annotate mercurial/demandimport.py @ 14554:68db17047637
hg: add peer method
author | Matt Mackall <mpm@selenic.com> |
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date | Fri, 10 Jun 2011 11:43:38 -0500 |
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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 __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=-1): |
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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 == -1: |
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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 if level != -1: |
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95 return _origimport(name, globals, locals, fromlist, level) |
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96 else: |
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97 return _origimport(name, globals, locals, fromlist) |
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98 # if a is already demand-loaded, add b to its submodule list |
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99 if base in locals: |
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100 if isinstance(locals[base], _demandmod): |
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101 locals[base]._extend(rest) |
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102 return locals[base] |
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103 return _demandmod(name, globals, locals) |
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104 else: |
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105 if level != -1: |
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106 # from . import b,c,d or from .a import b,c,d |
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107 return _origimport(name, globals, locals, fromlist, level) |
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108 # from a import b,c,d |
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109 mod = _origimport(name, globals, locals) |
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110 # recurse down the module chain |
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111 for comp in name.split('.')[1:]: |
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112 if not hasattr(mod, comp): |
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113 setattr(mod, comp, _demandmod(comp, mod.__dict__, mod.__dict__)) |
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114 mod = getattr(mod, comp) |
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115 for x in fromlist: |
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116 # set requested submodules for demand load |
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117 if not hasattr(mod, x): |
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118 setattr(mod, x, _demandmod(x, mod.__dict__, locals)) |
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119 return mod |
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120 |
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121 ignore = [ |
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122 '_hashlib', |
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123 '_xmlplus', |
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124 'fcntl', |
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125 'win32com.gen_py', |
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126 '_winreg', # 2.7 mimetypes needs immediate ImportError |
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127 'pythoncom', |
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128 # imported by tarfile, not available under Windows |
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129 'pwd', |
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130 'grp', |
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131 # imported by profile, itself imported by hotshot.stats, |
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132 # not available under Windows |
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133 'resource', |
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135 'gtk', | |
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136 # setuptools' pkg_resources.py expects "from __main__ import x" to |
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137 # raise ImportError if x not defined |
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138 '__main__', |
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139 '_ssl', # conditional imports in the stdlib, issue1964 |
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140 ] |
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141 |
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142 def enable(): |
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143 "enable global demand-loading of modules" |
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144 __builtin__.__import__ = _demandimport |
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145 |
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146 def disable(): |
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147 "disable global demand-loading of modules" |
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148 __builtin__.__import__ = _origimport |
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149 |