Mercurial > hg
annotate mercurial/demandimport.py @ 14605:9f1139cf5c76
hg: rearrange peer scheme lookup
There is now only peer scheme lookup. Repository lookup goes through
peer scheme lookup. When peer and repo types are finally separated,
repo lookup will use peer.local() to get a repository object.
The underbar is dropped so that extensions can patch the table.
author | Matt Mackall <mpm@selenic.com> |
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date | Mon, 13 Jun 2011 14:53:23 -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 |