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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 Matt Mackall <mpm@selenic.com> |
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3 | # Copyright 2006 Matt Mackall <mpm@selenic.com> | |
4 | # |
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4 | # | |
5 | # This software may be used and distributed according to the terms |
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5 | # This software may be used and distributed according to the terms | |
6 | # of the GNU General Public License, incorporated herein by reference. |
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6 | # of the GNU General Public License, incorporated herein by reference. | |
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 | _origimport = __import__ |
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27 | _origimport = __import__ | |
28 |
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28 | |||
29 | class _demandmod(object): |
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29 | class _demandmod(object): | |
30 | """module demand-loader and proxy""" |
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30 | """module demand-loader and proxy""" | |
31 | def __init__(self, name, globals, locals): |
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31 | def __init__(self, name, globals, locals): | |
32 | if '.' in name: |
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32 | if '.' in name: | |
33 | head, rest = name.split('.', 1) |
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33 | head, rest = name.split('.', 1) | |
34 | after = [rest] |
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34 | after = [rest] | |
35 | else: |
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35 | else: | |
36 | head = name |
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36 | head = name | |
37 | after = [] |
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37 | after = [] | |
38 |
self |
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38 | object.__setattr__(self, "_data", (head, globals, locals, after)) | |
39 | self.__dict__["_module"] = None |
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39 | object.__setattr__(self, "_module", None) | |
40 | def _extend(self, name): |
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40 | def _extend(self, name): | |
41 | """add to the list of submodules to load""" |
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41 | """add to the list of submodules to load""" | |
42 | self._data[3].append(name) |
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42 | self._data[3].append(name) | |
43 | def _load(self): |
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43 | def _load(self): | |
44 | if not self._module: |
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44 | if not self._module: | |
45 | head, globals, locals, after = self._data |
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45 | head, globals, locals, after = self._data | |
46 | mod = _origimport(head, globals, locals) |
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46 | mod = _origimport(head, globals, locals) | |
47 | # load submodules |
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47 | # load submodules | |
48 | for x in after: |
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48 | for x in after: | |
49 | hx = x |
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49 | hx = x | |
50 | if '.' in x: |
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50 | if '.' in x: | |
51 | hx = x.split('.')[0] |
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51 | hx = x.split('.')[0] | |
52 | if not hasattr(mod, hx): |
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52 | if not hasattr(mod, hx): | |
53 | setattr(mod, hx, _demandmod(x, mod.__dict__, mod.__dict__)) |
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53 | setattr(mod, hx, _demandmod(x, mod.__dict__, mod.__dict__)) | |
54 | # are we in the locals dictionary still? |
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54 | # are we in the locals dictionary still? | |
55 | if locals and locals.get(head) == self: |
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55 | if locals and locals.get(head) == self: | |
56 | locals[head] = mod |
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56 | locals[head] = mod | |
57 |
self |
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57 | object.__setattr__(self, "_module", mod) | |
58 | def __repr__(self): |
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58 | def __repr__(self): | |
59 | return "<unloaded module '%s'>" % self._data[0] |
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59 | return "<unloaded module '%s'>" % self._data[0] | |
60 | def __call__(self, *args, **kwargs): |
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60 | def __call__(self, *args, **kwargs): | |
61 | raise TypeError("'unloaded module' object is not callable") |
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61 | raise TypeError("'unloaded module' object is not callable") | |
62 | def __getattr__(self, attr): |
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62 | def __getattr__(self, attr): | |
63 | self._load() |
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63 | self._load() | |
64 | return getattr(self._module, attr) |
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64 | return getattr(self._module, attr) | |
65 | def __setattr__(self, attr, val): |
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65 | def __setattr__(self, attr, val): | |
66 | self._load() |
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66 | self._load() | |
67 | setattr(self._module, attr, val) |
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67 | setattr(self._module, attr, val) | |
68 |
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68 | |||
69 | def _demandimport(name, globals=None, locals=None, fromlist=None): |
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69 | def _demandimport(name, globals=None, locals=None, fromlist=None): | |
70 | if not locals or name in ignore or fromlist == ('*',): |
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70 | if not locals or name in ignore or fromlist == ('*',): | |
71 | # these cases we can't really delay |
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71 | # these cases we can't really delay | |
72 | return _origimport(name, globals, locals, fromlist) |
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72 | return _origimport(name, globals, locals, fromlist) | |
73 | elif not fromlist: |
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73 | elif not fromlist: | |
74 | # import a [as b] |
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74 | # import a [as b] | |
75 | if '.' in name: # a.b |
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75 | if '.' in name: # a.b | |
76 | base, rest = name.split('.', 1) |
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76 | base, rest = name.split('.', 1) | |
77 | # if a is already demand-loaded, add b to its submodule list |
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77 | # if a is already demand-loaded, add b to its submodule list | |
78 | if base in locals: |
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78 | if base in locals: | |
79 | if isinstance(locals[base], _demandmod): |
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79 | if isinstance(locals[base], _demandmod): | |
80 | locals[base]._extend(rest) |
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80 | locals[base]._extend(rest) | |
81 | return locals[base] |
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81 | return locals[base] | |
82 | return _demandmod(name, globals, locals) |
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82 | return _demandmod(name, globals, locals) | |
83 | else: |
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83 | else: | |
84 | # from a import b,c,d |
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84 | # from a import b,c,d | |
85 | mod = _origimport(name, globals, locals) |
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85 | mod = _origimport(name, globals, locals) | |
86 | # recurse down the module chain |
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86 | # recurse down the module chain | |
87 | for comp in name.split('.')[1:]: |
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87 | for comp in name.split('.')[1:]: | |
88 | mod = getattr(mod, comp) |
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88 | mod = getattr(mod, comp) | |
89 | for x in fromlist: |
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89 | for x in fromlist: | |
90 | # set requested submodules for demand load |
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90 | # set requested submodules for demand load | |
91 | if not(hasattr(mod, x)): |
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91 | if not(hasattr(mod, x)): | |
92 | setattr(mod, x, _demandmod(x, mod.__dict__, mod.__dict__)) |
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92 | setattr(mod, x, _demandmod(x, mod.__dict__, mod.__dict__)) | |
93 | return mod |
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93 | return mod | |
94 |
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94 | |||
95 | ignore = [] |
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95 | ignore = [] | |
96 |
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96 | |||
97 | def enable(): |
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97 | def enable(): | |
98 | "enable global demand-loading of modules" |
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98 | "enable global demand-loading of modules" | |
99 | __builtins__["__import__"] = _demandimport |
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99 | __builtins__["__import__"] = _demandimport | |
100 |
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100 | |||
101 | def disable(): |
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101 | def disable(): | |
102 | "disable global demand-loading of modules" |
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102 | "disable global demand-loading of modules" | |
103 | __builtins__["__import__"] = _origimport |
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103 | __builtins__["__import__"] = _origimport | |
104 |
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104 |
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