Mercurial > public > mercurial-scm > hg

annotate mercurial/demandimport.py @ 13741:b51bf961b3cb

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wireproto: add getbundle() function getbundle(common, heads) -> bundle Returns the changegroup for all ancestors of heads which are not ancestors of common. For both sets, the heads are included in the set. Intended to eventually supercede changegroupsubset and changegroup. Uses heads of common region to exclude unwanted changesets instead of bases of desired region, which is more useful and easier to implement. Designed to be extensible with new optional arguments (which will have to be guarded by corresponding capabilities).
author Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
date Wed, 23 Mar 2011 16:02:11 +0100
parents 4db5bfea1b07
children 04a950b1c2ad
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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=-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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134 # this trips up many extension authors
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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
1037bd445768 demandimport: add __main__ to the blacklist (because of setuptools)
Greg Ward <greg-hg@gerg.ca>
parents: 10263
diff changeset
138 '__main__',
10612
30553ac3e355 demandimport: blacklist _ssl (issue1964)
Dirkjan Ochtman <dirkjan@ochtman.nl>
parents: 10598
diff changeset
139 '_ssl', # conditional imports in the stdlib, issue1964
5098
0bbd86b847dd demandimport: ignore resource module, not available under Windows.
Patrick Mezard <pmezard@gmail.com>
parents: 5097
diff changeset
140 ]
3877
abaee83ce0a6 Replace demandload with new demandimport
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
141
abaee83ce0a6 Replace demandload with new demandimport
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
142 def enable():
abaee83ce0a6 Replace demandload with new demandimport
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
143 "enable global demand-loading of modules"
7727
25fc4c620e54 demandimport: patch __builtin__ instead of __builtins__
Dirkjan Ochtman <dirkjan@ochtman.nl>
parents: 5929
diff changeset
144 __builtin__.__import__ = _demandimport
3877
abaee83ce0a6 Replace demandload with new demandimport
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
145
abaee83ce0a6 Replace demandload with new demandimport
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
146 def disable():
abaee83ce0a6 Replace demandload with new demandimport
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
147 "disable global demand-loading of modules"
7727
25fc4c620e54 demandimport: patch __builtin__ instead of __builtins__
Dirkjan Ochtman <dirkjan@ochtman.nl>
parents: 5929
diff changeset
148 __builtin__.__import__ = _origimport
3877
abaee83ce0a6 Replace demandload with new demandimport
Matt Mackall <mpm@selenic.com>
parents:
diff changeset
149