1# -*- Mode: Python; py-indent-offset: 4 -*-
2# pygtk - Python bindings for the GTK toolkit.
3# Copyright (C) 2006  Johan Dahlin
4#
5# This library is free software; you can redistribute it and/or
6# modify it under the terms of the GNU Lesser General Public
7# License as published by the Free Software Foundation; either
8# version 2.1 of the License, or (at your option) any later version.
9#
10# This library is distributed in the hope that it will be useful,
11# but WITHOUT ANY WARRANTY; without even the implied warranty of
12# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13# Lesser General Public License for more details.
14#
15# You should have received a copy of the GNU Lesser General Public
16# License along with this library; if not, write to the Free Software
17# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
18# USA
19
20# Private to PyGTK, do not use in applications
21
22import sys
23from types import ModuleType
24
25class LazyModule(object):
26    def __init__(self, name, locals):
27        self._name = name
28        self._locals = locals
29        self._modname = '%s.%s' % (self._locals.get('__name__'), self._name)
30
31    def __getattr__(self, attr):
32        module = __import__(self._name, self._locals, {}, ' ')
33        sys.modules[self._modname] = module
34        if attr == '__members__':
35            return dir(module)
36        return getattr(module, attr)
37
38class _NotLoadedMarker:
39    pass
40_marker = _NotLoadedMarker()
41
42class LazyDict(dict):
43    def __init__(self, module):
44        self._module = module
45        dict.__init__(self)
46
47    def __getitem__(self, name):
48        print name
49        return getattr(self._module, name)
50
51class LazyNamespace(ModuleType):
52    def __init__(self, module, locals):
53        ModuleType.__init__(self, locals['__name__'])
54        self._imports = {}
55
56        ns = self.__dict__
57        ns.update(locals)
58        ns['__module__'] = self
59        lazy_symbols = {}
60        for symbol in module._get_symbol_names():
61            lazy_symbols[symbol] = ns[symbol] = _marker
62
63        ns.update(__dict__=LazyDict(self),
64                  __bases__=(ModuleType,),
65                  add_submodule=self.add_submodule)
66
67        def __getattribute__(_, name):
68            v = ns.get(name, _marker)
69            if v is not _marker:
70                return v
71            if name in lazy_symbols:
72                s = module._get_symbol(ns, name)
73                return s
74            elif name in self._imports:
75                m = __import__(self._imports[name], {}, {}, ' ')
76                ns[name] = m
77                return m
78
79            raise AttributeError(name)
80        LazyNamespace.__getattribute__ = __getattribute__
81
82    def add_submodule(self, name, importname):
83        self._imports[name] = importname
84
85