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Add some modules to the demandimport ignore list for Windows
Matt Mackall -
r3929:33988aaa default
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@@ -1,115 +1,115
1 # demandimport.py - global demand-loading of modules for Mercurial
1 # demandimport.py - global demand-loading of modules for Mercurial
2 #
2 #
3 # Copyright 2006 Matt Mackall <mpm@selenic.com>
3 # Copyright 2006 Matt Mackall <mpm@selenic.com>
4 #
4 #
5 # This software may be used and distributed according to the terms
5 # This software may be used and distributed according to the terms
6 # of the GNU General Public License, incorporated herein by reference.
6 # of the GNU General Public License, incorporated herein by reference.
7
7
8 '''
8 '''
9 demandimport - automatic demandloading of modules
9 demandimport - automatic demandloading of modules
10
10
11 To enable this module, do:
11 To enable this module, do:
12
12
13 import demandimport; demandimport.enable()
13 import demandimport; demandimport.enable()
14
14
15 Imports of the following forms will be demand-loaded:
15 Imports of the following forms will be demand-loaded:
16
16
17 import a, b.c
17 import a, b.c
18 import a.b as c
18 import a.b as c
19 from a import b,c # a will be loaded immediately
19 from a import b,c # a will be loaded immediately
20
20
21 These imports will not be delayed:
21 These imports will not be delayed:
22
22
23 from a import *
23 from a import *
24 b = __import__(a)
24 b = __import__(a)
25 '''
25 '''
26
26
27 _origimport = __import__
27 _origimport = __import__
28
28
29 class _demandmod(object):
29 class _demandmod(object):
30 """module demand-loader and proxy"""
30 """module demand-loader and proxy"""
31 def __init__(self, name, globals, locals):
31 def __init__(self, name, globals, locals):
32 if '.' in name:
32 if '.' in name:
33 head, rest = name.split('.', 1)
33 head, rest = name.split('.', 1)
34 after = [rest]
34 after = [rest]
35 else:
35 else:
36 head = name
36 head = name
37 after = []
37 after = []
38 object.__setattr__(self, "_data", (head, globals, locals, after))
38 object.__setattr__(self, "_data", (head, globals, locals, after))
39 object.__setattr__(self, "_module", None)
39 object.__setattr__(self, "_module", None)
40 def _extend(self, name):
40 def _extend(self, name):
41 """add to the list of submodules to load"""
41 """add to the list of submodules to load"""
42 self._data[3].append(name)
42 self._data[3].append(name)
43 def _load(self):
43 def _load(self):
44 if not self._module:
44 if not self._module:
45 head, globals, locals, after = self._data
45 head, globals, locals, after = self._data
46 mod = _origimport(head, globals, locals)
46 mod = _origimport(head, globals, locals)
47 # load submodules
47 # load submodules
48 def subload(mod, p):
48 def subload(mod, p):
49 h, t = p, None
49 h, t = p, None
50 if '.' in p:
50 if '.' in p:
51 h, t = p.split('.', 1)
51 h, t = p.split('.', 1)
52 if not hasattr(mod, h):
52 if not hasattr(mod, h):
53 setattr(mod, h, _demandmod(p, mod.__dict__, mod.__dict__))
53 setattr(mod, h, _demandmod(p, mod.__dict__, mod.__dict__))
54 elif t:
54 elif t:
55 subload(getattr(mod, h), t)
55 subload(getattr(mod, h), t)
56
56
57 for x in after:
57 for x in after:
58 subload(mod, x)
58 subload(mod, x)
59
59
60 # are we in the locals dictionary still?
60 # are we in the locals dictionary still?
61 if locals and locals.get(head) == self:
61 if locals and locals.get(head) == self:
62 locals[head] = mod
62 locals[head] = mod
63 object.__setattr__(self, "_module", mod)
63 object.__setattr__(self, "_module", mod)
64 def __repr__(self):
64 def __repr__(self):
65 return "<unloaded module '%s'>" % self._data[0]
65 return "<unloaded module '%s'>" % self._data[0]
66 def __call__(self, *args, **kwargs):
66 def __call__(self, *args, **kwargs):
67 raise TypeError("'unloaded module' object is not callable")
67 raise TypeError("'unloaded module' object is not callable")
68 def __getattribute__(self, attr):
68 def __getattribute__(self, attr):
69 if attr in ('_data', '_extend', '_load', '_module'):
69 if attr in ('_data', '_extend', '_load', '_module'):
70 return object.__getattribute__(self, attr)
70 return object.__getattribute__(self, attr)
71 self._load()
71 self._load()
72 return getattr(self._module, attr)
72 return getattr(self._module, attr)
73 def __setattr__(self, attr, val):
73 def __setattr__(self, attr, val):
74 self._load()
74 self._load()
75 setattr(self._module, attr, val)
75 setattr(self._module, attr, val)
76
76
77 def _demandimport(name, globals=None, locals=None, fromlist=None):
77 def _demandimport(name, globals=None, locals=None, fromlist=None):
78 if not locals or name in ignore or fromlist == ('*',):
78 if not locals or name in ignore or fromlist == ('*',):
79 # these cases we can't really delay
79 # these cases we can't really delay
80 return _origimport(name, globals, locals, fromlist)
80 return _origimport(name, globals, locals, fromlist)
81 elif not fromlist:
81 elif not fromlist:
82 # import a [as b]
82 # import a [as b]
83 if '.' in name: # a.b
83 if '.' in name: # a.b
84 base, rest = name.split('.', 1)
84 base, rest = name.split('.', 1)
85 # email.__init__ loading email.mime
85 # email.__init__ loading email.mime
86 if globals and globals.get('__name__', None) == base:
86 if globals and globals.get('__name__', None) == base:
87 return _origimport(name, globals, locals, fromlist)
87 return _origimport(name, globals, locals, fromlist)
88 # if a is already demand-loaded, add b to its submodule list
88 # if a is already demand-loaded, add b to its submodule list
89 if base in locals:
89 if base in locals:
90 if isinstance(locals[base], _demandmod):
90 if isinstance(locals[base], _demandmod):
91 locals[base]._extend(rest)
91 locals[base]._extend(rest)
92 return locals[base]
92 return locals[base]
93 return _demandmod(name, globals, locals)
93 return _demandmod(name, globals, locals)
94 else:
94 else:
95 # from a import b,c,d
95 # from a import b,c,d
96 mod = _origimport(name, globals, locals)
96 mod = _origimport(name, globals, locals)
97 # recurse down the module chain
97 # recurse down the module chain
98 for comp in name.split('.')[1:]:
98 for comp in name.split('.')[1:]:
99 mod = getattr(mod, comp)
99 mod = getattr(mod, comp)
100 for x in fromlist:
100 for x in fromlist:
101 # set requested submodules for demand load
101 # set requested submodules for demand load
102 if not(hasattr(mod, x)):
102 if not(hasattr(mod, x)):
103 setattr(mod, x, _demandmod(x, mod.__dict__, mod.__dict__))
103 setattr(mod, x, _demandmod(x, mod.__dict__, mod.__dict__))
104 return mod
104 return mod
105
105
106 ignore = ['_hashlib']
106 ignore = ['_hashlib', 'fcntl', 'win32com.gen_py']
107
107
108 def enable():
108 def enable():
109 "enable global demand-loading of modules"
109 "enable global demand-loading of modules"
110 __builtins__["__import__"] = _demandimport
110 __builtins__["__import__"] = _demandimport
111
111
112 def disable():
112 def disable():
113 "disable global demand-loading of modules"
113 "disable global demand-loading of modules"
114 __builtins__["__import__"] = _origimport
114 __builtins__["__import__"] = _origimport
115
115
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