author | Nishanth Amuluru <nishanth@fossee.in> |
Sat, 08 Jan 2011 15:13:56 +0530 | |
changeset 318 | 49ee2a7f1350 |
parent 307 | c6bca38c1cbf |
permissions | -rw-r--r-- |
307
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1 |
""" |
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2 |
apipkg: control the exported namespace of a python package. |
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|
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4 |
see http://pypi.python.org/pypi/apipkg |
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|
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(c) holger krekel, 2009 - MIT license |
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7 |
""" |
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import os |
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import sys |
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from types import ModuleType |
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|
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__version__ = '1.2.dev5' |
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|
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def initpkg(pkgname, exportdefs, attr=dict()): |
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""" initialize given package from the export definitions. """ |
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oldmod = sys.modules.get(pkgname) |
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d = {} |
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f = getattr(oldmod, '__file__', None) |
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if f: |
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f = os.path.abspath(f) |
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d['__file__'] = f |
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if hasattr(oldmod, '__version__'): |
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d['__version__'] = oldmod.__version__ |
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if hasattr(oldmod, '__loader__'): |
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d['__loader__'] = oldmod.__loader__ |
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if hasattr(oldmod, '__path__'): |
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d['__path__'] = [os.path.abspath(p) for p in oldmod.__path__] |
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if '__doc__' not in exportdefs and getattr(oldmod, '__doc__', None): |
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d['__doc__'] = oldmod.__doc__ |
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d.update(attr) |
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if hasattr(oldmod, "__dict__"): |
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oldmod.__dict__.update(d) |
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mod = ApiModule(pkgname, exportdefs, implprefix=pkgname, attr=d) |
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sys.modules[pkgname] = mod |
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def importobj(modpath, attrname): |
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module = __import__(modpath, None, None, ['__doc__']) |
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if not attrname: |
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return module |
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retval = module |
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names = attrname.split(".") |
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for x in names: |
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retval = getattr(retval, x) |
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return retval |
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class ApiModule(ModuleType): |
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def __docget(self): |
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try: |
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return self.__doc |
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except AttributeError: |
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if '__doc__' in self.__map__: |
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return self.__makeattr('__doc__') |
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def __docset(self, value): |
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self.__doc = value |
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__doc__ = property(__docget, __docset) |
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|
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def __init__(self, name, importspec, implprefix=None, attr=None): |
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self.__name__ = name |
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self.__all__ = [x for x in importspec if x != '__onfirstaccess__'] |
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self.__map__ = {} |
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self.__implprefix__ = implprefix or name |
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if attr: |
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for name, val in attr.items(): |
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#print "setting", self.__name__, name, val |
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setattr(self, name, val) |
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for name, importspec in importspec.items(): |
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if isinstance(importspec, dict): |
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69 |
subname = '%s.%s'%(self.__name__, name) |
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apimod = ApiModule(subname, importspec, implprefix) |
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sys.modules[subname] = apimod |
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setattr(self, name, apimod) |
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73 |
else: |
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74 |
parts = importspec.split(':') |
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modpath = parts.pop(0) |
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attrname = parts and parts[0] or "" |
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77 |
if modpath[0] == '.': |
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78 |
modpath = implprefix + modpath |
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79 |
|
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if not attrname: |
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81 |
subname = '%s.%s'%(self.__name__, name) |
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82 |
apimod = AliasModule(subname, modpath) |
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83 |
sys.modules[subname] = apimod |
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84 |
if '.' not in name: |
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85 |
setattr(self, name, apimod) |
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86 |
else: |
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87 |
self.__map__[name] = (modpath, attrname) |
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88 |
|
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89 |
def __repr__(self): |
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90 |
l = [] |
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91 |
if hasattr(self, '__version__'): |
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92 |
l.append("version=" + repr(self.__version__)) |
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93 |
if hasattr(self, '__file__'): |
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94 |
l.append('from ' + repr(self.__file__)) |
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95 |
if l: |
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96 |
return '<ApiModule %r %s>' % (self.__name__, " ".join(l)) |
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97 |
return '<ApiModule %r>' % (self.__name__,) |
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98 |
|
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99 |
def __makeattr(self, name): |
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100 |
"""lazily compute value for name or raise AttributeError if unknown.""" |
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101 |
#print "makeattr", self.__name__, name |
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102 |
target = None |
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103 |
if '__onfirstaccess__' in self.__map__: |
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104 |
target = self.__map__.pop('__onfirstaccess__') |
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105 |
importobj(*target)() |
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106 |
try: |
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107 |
modpath, attrname = self.__map__[name] |
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108 |
except KeyError: |
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109 |
if target is not None and name != '__onfirstaccess__': |
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110 |
# retry, onfirstaccess might have set attrs |
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111 |
return getattr(self, name) |
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112 |
raise AttributeError(name) |
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113 |
else: |
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114 |
result = importobj(modpath, attrname) |
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115 |
setattr(self, name, result) |
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116 |
try: |
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117 |
del self.__map__[name] |
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118 |
except KeyError: |
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119 |
pass # in a recursive-import situation a double-del can happen |
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120 |
return result |
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121 |
|
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122 |
__getattr__ = __makeattr |
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123 |
|
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124 |
def __dict__(self): |
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125 |
# force all the content of the module to be loaded when __dict__ is read |
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126 |
dictdescr = ModuleType.__dict__['__dict__'] |
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127 |
dict = dictdescr.__get__(self) |
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128 |
if dict is not None: |
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129 |
hasattr(self, 'some') |
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130 |
for name in self.__all__: |
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131 |
try: |
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132 |
self.__makeattr(name) |
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133 |
except AttributeError: |
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134 |
pass |
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135 |
return dict |
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136 |
__dict__ = property(__dict__) |
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137 |
|
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138 |
|
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139 |
def AliasModule(modname, modpath): |
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140 |
mod = [] |
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141 |
|
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142 |
def getmod(): |
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143 |
if not mod: |
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144 |
mod.append(importobj(modpath, None)) |
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145 |
return mod[0] |
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146 |
|
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147 |
class AliasModule(ModuleType): |
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148 |
|
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149 |
def __repr__(self): |
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150 |
return '<AliasModule %r for %r>' % (modname, modpath) |
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151 |
|
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152 |
def __getattribute__(self, name): |
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153 |
return getattr(getmod(), name) |
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154 |
|
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155 |
def __setattr__(self, name, value): |
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156 |
setattr(getmod(), name, value) |
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157 |
|
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158 |
def __delattr__(self, name): |
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159 |
delattr(getmod(), name) |
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160 |
|
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161 |
return AliasModule(modname) |