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@@ -1,175 +1,179 b'' | |||||
1 | # demandimport.py - global demand-loading of modules for Mercurial |
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1 | # demandimport.py - global demand-loading of modules for Mercurial | |
2 | # |
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2 | # | |
3 | # Copyright 2006, 2007 Matt Mackall <mpm@selenic.com> |
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3 | # Copyright 2006, 2007 Matt Mackall <mpm@selenic.com> | |
4 | # |
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4 | # | |
5 | # This software may be used and distributed according to the terms of the |
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5 | # This software may be used and distributed according to the terms of the | |
6 | # GNU General Public License version 2 or any later version. |
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6 | # GNU General Public License version 2 or any later version. | |
7 |
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7 | |||
8 | ''' |
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8 | ''' | |
9 | demandimport - automatic demandloading of modules |
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9 | demandimport - automatic demandloading of modules | |
10 |
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10 | |||
11 | To enable this module, do: |
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11 | To enable this module, do: | |
12 |
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12 | |||
13 | import demandimport; demandimport.enable() |
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13 | import demandimport; demandimport.enable() | |
14 |
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14 | |||
15 | Imports of the following forms will be demand-loaded: |
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15 | Imports of the following forms will be demand-loaded: | |
16 |
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16 | |||
17 | import a, b.c |
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17 | import a, b.c | |
18 | import a.b as c |
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18 | import a.b as c | |
19 | from a import b,c # a will be loaded immediately |
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19 | from a import b,c # a will be loaded immediately | |
20 |
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20 | |||
21 | These imports will not be delayed: |
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21 | These imports will not be delayed: | |
22 |
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22 | |||
23 | from a import * |
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23 | from a import * | |
24 | b = __import__(a) |
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24 | b = __import__(a) | |
25 | ''' |
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25 | ''' | |
26 |
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26 | |||
27 | import __builtin__, os |
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27 | import __builtin__, os, sys | |
28 | _origimport = __import__ |
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28 | _origimport = __import__ | |
29 |
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29 | |||
30 | nothing = object() |
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30 | nothing = object() | |
31 |
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31 | |||
32 | try: |
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32 | try: | |
33 | _origimport(__builtin__.__name__, {}, {}, None, -1) |
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33 | # Python 3 doesn't have relative imports nor level -1. | |
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34 | level = -1 | |||
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35 | if sys.version_info[0] >= 3: | |||
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36 | level = 0 | |||
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37 | _origimport(__builtin__.__name__, {}, {}, None, level) | |||
34 | except TypeError: # no level argument |
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38 | except TypeError: # no level argument | |
35 | def _import(name, globals, locals, fromlist, level): |
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39 | def _import(name, globals, locals, fromlist, level): | |
36 | "call _origimport with no level argument" |
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40 | "call _origimport with no level argument" | |
37 | return _origimport(name, globals, locals, fromlist) |
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41 | return _origimport(name, globals, locals, fromlist) | |
38 | else: |
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42 | else: | |
39 | _import = _origimport |
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43 | _import = _origimport | |
40 |
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44 | |||
41 | def _hgextimport(importfunc, name, globals, *args): |
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45 | def _hgextimport(importfunc, name, globals, *args): | |
42 | try: |
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46 | try: | |
43 | return importfunc(name, globals, *args) |
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47 | return importfunc(name, globals, *args) | |
44 | except ImportError: |
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48 | except ImportError: | |
45 | if not globals: |
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49 | if not globals: | |
46 | raise |
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50 | raise | |
47 | # extensions are loaded with "hgext_" prefix |
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51 | # extensions are loaded with "hgext_" prefix | |
48 | hgextname = 'hgext_%s' % name |
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52 | hgextname = 'hgext_%s' % name | |
49 | nameroot = hgextname.split('.', 1)[0] |
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53 | nameroot = hgextname.split('.', 1)[0] | |
50 | contextroot = globals.get('__name__', '').split('.', 1)[0] |
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54 | contextroot = globals.get('__name__', '').split('.', 1)[0] | |
51 | if nameroot != contextroot: |
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55 | if nameroot != contextroot: | |
52 | raise |
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56 | raise | |
53 | # retry to import with "hgext_" prefix |
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57 | # retry to import with "hgext_" prefix | |
54 | return importfunc(hgextname, globals, *args) |
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58 | return importfunc(hgextname, globals, *args) | |
55 |
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59 | |||
56 | class _demandmod(object): |
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60 | class _demandmod(object): | |
57 | """module demand-loader and proxy""" |
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61 | """module demand-loader and proxy""" | |
58 |
def __init__(self, name, globals, locals, level= |
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62 | def __init__(self, name, globals, locals, level=level): | |
59 | if '.' in name: |
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63 | if '.' in name: | |
60 | head, rest = name.split('.', 1) |
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64 | head, rest = name.split('.', 1) | |
61 | after = [rest] |
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65 | after = [rest] | |
62 | else: |
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66 | else: | |
63 | head = name |
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67 | head = name | |
64 | after = [] |
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68 | after = [] | |
65 | object.__setattr__(self, "_data", |
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69 | object.__setattr__(self, "_data", | |
66 | (head, globals, locals, after, level)) |
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70 | (head, globals, locals, after, level)) | |
67 | object.__setattr__(self, "_module", None) |
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71 | object.__setattr__(self, "_module", None) | |
68 | def _extend(self, name): |
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72 | def _extend(self, name): | |
69 | """add to the list of submodules to load""" |
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73 | """add to the list of submodules to load""" | |
70 | self._data[3].append(name) |
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74 | self._data[3].append(name) | |
71 | def _load(self): |
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75 | def _load(self): | |
72 | if not self._module: |
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76 | if not self._module: | |
73 | head, globals, locals, after, level = self._data |
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77 | head, globals, locals, after, level = self._data | |
74 | mod = _hgextimport(_import, head, globals, locals, None, level) |
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78 | mod = _hgextimport(_import, head, globals, locals, None, level) | |
75 | # load submodules |
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79 | # load submodules | |
76 | def subload(mod, p): |
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80 | def subload(mod, p): | |
77 | h, t = p, None |
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81 | h, t = p, None | |
78 | if '.' in p: |
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82 | if '.' in p: | |
79 | h, t = p.split('.', 1) |
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83 | h, t = p.split('.', 1) | |
80 | if getattr(mod, h, nothing) is nothing: |
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84 | if getattr(mod, h, nothing) is nothing: | |
81 | setattr(mod, h, _demandmod(p, mod.__dict__, mod.__dict__)) |
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85 | setattr(mod, h, _demandmod(p, mod.__dict__, mod.__dict__)) | |
82 | elif t: |
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86 | elif t: | |
83 | subload(getattr(mod, h), t) |
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87 | subload(getattr(mod, h), t) | |
84 |
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88 | |||
85 | for x in after: |
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89 | for x in after: | |
86 | subload(mod, x) |
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90 | subload(mod, x) | |
87 |
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91 | |||
88 | # are we in the locals dictionary still? |
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92 | # are we in the locals dictionary still? | |
89 | if locals and locals.get(head) == self: |
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93 | if locals and locals.get(head) == self: | |
90 | locals[head] = mod |
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94 | locals[head] = mod | |
91 | object.__setattr__(self, "_module", mod) |
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95 | object.__setattr__(self, "_module", mod) | |
92 |
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96 | |||
93 | def __repr__(self): |
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97 | def __repr__(self): | |
94 | if self._module: |
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98 | if self._module: | |
95 | return "<proxied module '%s'>" % self._data[0] |
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99 | return "<proxied module '%s'>" % self._data[0] | |
96 | return "<unloaded module '%s'>" % self._data[0] |
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100 | return "<unloaded module '%s'>" % self._data[0] | |
97 | def __call__(self, *args, **kwargs): |
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101 | def __call__(self, *args, **kwargs): | |
98 | raise TypeError("%s object is not callable" % repr(self)) |
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102 | raise TypeError("%s object is not callable" % repr(self)) | |
99 | def __getattribute__(self, attr): |
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103 | def __getattribute__(self, attr): | |
100 | if attr in ('_data', '_extend', '_load', '_module'): |
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104 | if attr in ('_data', '_extend', '_load', '_module'): | |
101 | return object.__getattribute__(self, attr) |
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105 | return object.__getattribute__(self, attr) | |
102 | self._load() |
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106 | self._load() | |
103 | return getattr(self._module, attr) |
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107 | return getattr(self._module, attr) | |
104 | def __setattr__(self, attr, val): |
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108 | def __setattr__(self, attr, val): | |
105 | self._load() |
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109 | self._load() | |
106 | setattr(self._module, attr, val) |
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110 | setattr(self._module, attr, val) | |
107 |
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111 | |||
108 |
def _demandimport(name, globals=None, locals=None, fromlist=None, level= |
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112 | def _demandimport(name, globals=None, locals=None, fromlist=None, level=level): | |
109 | if not locals or name in ignore or fromlist == ('*',): |
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113 | if not locals or name in ignore or fromlist == ('*',): | |
110 | # these cases we can't really delay |
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114 | # these cases we can't really delay | |
111 | return _hgextimport(_import, name, globals, locals, fromlist, level) |
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115 | return _hgextimport(_import, name, globals, locals, fromlist, level) | |
112 | elif not fromlist: |
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116 | elif not fromlist: | |
113 | # import a [as b] |
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117 | # import a [as b] | |
114 | if '.' in name: # a.b |
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118 | if '.' in name: # a.b | |
115 | base, rest = name.split('.', 1) |
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119 | base, rest = name.split('.', 1) | |
116 | # email.__init__ loading email.mime |
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120 | # email.__init__ loading email.mime | |
117 | if globals and globals.get('__name__', None) == base: |
|
121 | if globals and globals.get('__name__', None) == base: | |
118 | return _import(name, globals, locals, fromlist, level) |
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122 | return _import(name, globals, locals, fromlist, level) | |
119 | # if a is already demand-loaded, add b to its submodule list |
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123 | # if a is already demand-loaded, add b to its submodule list | |
120 | if base in locals: |
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124 | if base in locals: | |
121 | if isinstance(locals[base], _demandmod): |
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125 | if isinstance(locals[base], _demandmod): | |
122 | locals[base]._extend(rest) |
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126 | locals[base]._extend(rest) | |
123 | return locals[base] |
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127 | return locals[base] | |
124 | return _demandmod(name, globals, locals, level) |
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128 | return _demandmod(name, globals, locals, level) | |
125 | else: |
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129 | else: | |
126 | if level != -1: |
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130 | if level != -1: | |
127 | # from . import b,c,d or from .a import b,c,d |
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131 | # from . import b,c,d or from .a import b,c,d | |
128 | return _origimport(name, globals, locals, fromlist, level) |
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132 | return _origimport(name, globals, locals, fromlist, level) | |
129 | # from a import b,c,d |
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133 | # from a import b,c,d | |
130 | mod = _hgextimport(_origimport, name, globals, locals) |
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134 | mod = _hgextimport(_origimport, name, globals, locals) | |
131 | # recurse down the module chain |
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135 | # recurse down the module chain | |
132 | for comp in name.split('.')[1:]: |
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136 | for comp in name.split('.')[1:]: | |
133 | if getattr(mod, comp, nothing) is nothing: |
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137 | if getattr(mod, comp, nothing) is nothing: | |
134 | setattr(mod, comp, _demandmod(comp, mod.__dict__, mod.__dict__)) |
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138 | setattr(mod, comp, _demandmod(comp, mod.__dict__, mod.__dict__)) | |
135 | mod = getattr(mod, comp) |
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139 | mod = getattr(mod, comp) | |
136 | for x in fromlist: |
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140 | for x in fromlist: | |
137 | # set requested submodules for demand load |
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141 | # set requested submodules for demand load | |
138 | if getattr(mod, x, nothing) is nothing: |
|
142 | if getattr(mod, x, nothing) is nothing: | |
139 | setattr(mod, x, _demandmod(x, mod.__dict__, locals)) |
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143 | setattr(mod, x, _demandmod(x, mod.__dict__, locals)) | |
140 | return mod |
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144 | return mod | |
141 |
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145 | |||
142 | ignore = [ |
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146 | ignore = [ | |
143 | '_hashlib', |
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147 | '_hashlib', | |
144 | '_xmlplus', |
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148 | '_xmlplus', | |
145 | 'fcntl', |
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149 | 'fcntl', | |
146 | 'win32com.gen_py', |
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150 | 'win32com.gen_py', | |
147 | '_winreg', # 2.7 mimetypes needs immediate ImportError |
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151 | '_winreg', # 2.7 mimetypes needs immediate ImportError | |
148 | 'pythoncom', |
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152 | 'pythoncom', | |
149 | # imported by tarfile, not available under Windows |
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153 | # imported by tarfile, not available under Windows | |
150 | 'pwd', |
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154 | 'pwd', | |
151 | 'grp', |
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155 | 'grp', | |
152 | # imported by profile, itself imported by hotshot.stats, |
|
156 | # imported by profile, itself imported by hotshot.stats, | |
153 | # not available under Windows |
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157 | # not available under Windows | |
154 | 'resource', |
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158 | 'resource', | |
155 | # this trips up many extension authors |
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159 | # this trips up many extension authors | |
156 | 'gtk', |
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160 | 'gtk', | |
157 | # setuptools' pkg_resources.py expects "from __main__ import x" to |
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161 | # setuptools' pkg_resources.py expects "from __main__ import x" to | |
158 | # raise ImportError if x not defined |
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162 | # raise ImportError if x not defined | |
159 | '__main__', |
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163 | '__main__', | |
160 | '_ssl', # conditional imports in the stdlib, issue1964 |
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164 | '_ssl', # conditional imports in the stdlib, issue1964 | |
161 | 'rfc822', |
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165 | 'rfc822', | |
162 | 'mimetools', |
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166 | 'mimetools', | |
163 | ] |
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167 | ] | |
164 |
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168 | |||
165 | def isenabled(): |
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169 | def isenabled(): | |
166 | return __builtin__.__import__ == _demandimport |
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170 | return __builtin__.__import__ == _demandimport | |
167 |
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171 | |||
168 | def enable(): |
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172 | def enable(): | |
169 | "enable global demand-loading of modules" |
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173 | "enable global demand-loading of modules" | |
170 | if os.environ.get('HGDEMANDIMPORT') != 'disable': |
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174 | if os.environ.get('HGDEMANDIMPORT') != 'disable': | |
171 | __builtin__.__import__ = _demandimport |
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175 | __builtin__.__import__ = _demandimport | |
172 |
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176 | |||
173 | def disable(): |
|
177 | def disable(): | |
174 | "disable global demand-loading of modules" |
|
178 | "disable global demand-loading of modules" | |
175 | __builtin__.__import__ = _origimport |
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179 | __builtin__.__import__ = _origimport |
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