author | Matt Mackall <mpm@selenic.com> |
Fri, 17 May 2013 14:31:06 -0500 | |
branch | stable |
changeset 19210 | 865beb849720 |
parent 15096 | 868282fa29d8 |
child 19932 | e3a5922e18c3 |
permissions | -rw-r--r-- |
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# demandimport.py - global demand-loading of modules for Mercurial |
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# |
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# Copyright 2006, 2007 Matt Mackall <mpm@selenic.com> |
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# |
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# This software may be used and distributed according to the terms of the |
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# GNU General Public License version 2 or any later version. |
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''' |
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demandimport - automatic demandloading of modules |
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To enable this module, do: |
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import demandimport; demandimport.enable() |
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Imports of the following forms will be demand-loaded: |
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import a, b.c |
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import a.b as c |
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from a import b,c # a will be loaded immediately |
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These imports will not be delayed: |
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from a import * |
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b = __import__(a) |
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''' |
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import __builtin__ |
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_origimport = __import__ |
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nothing = object() |
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try: |
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_origimport(__builtin__.__name__, {}, {}, None, -1) |
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except TypeError: # no level argument |
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def _import(name, globals, locals, fromlist, level): |
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"call _origimport with no level argument" |
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return _origimport(name, globals, locals, fromlist) |
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else: |
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_import = _origimport |
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class _demandmod(object): |
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"""module demand-loader and proxy""" |
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def __init__(self, name, globals, locals): |
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if '.' in name: |
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head, rest = name.split('.', 1) |
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after = [rest] |
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else: |
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head = name |
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after = [] |
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object.__setattr__(self, "_data", (head, globals, locals, after)) |
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object.__setattr__(self, "_module", None) |
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def _extend(self, name): |
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"""add to the list of submodules to load""" |
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self._data[3].append(name) |
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def _load(self): |
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if not self._module: |
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head, globals, locals, after = self._data |
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mod = _origimport(head, globals, locals) |
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# load submodules |
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def subload(mod, p): |
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h, t = p, None |
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if '.' in p: |
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h, t = p.split('.', 1) |
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if getattr(mod, h, nothing) is nothing: |
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setattr(mod, h, _demandmod(p, mod.__dict__, mod.__dict__)) |
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elif t: |
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subload(getattr(mod, h), t) |
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for x in after: |
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subload(mod, x) |
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# are we in the locals dictionary still? |
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if locals and locals.get(head) == self: |
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locals[head] = mod |
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object.__setattr__(self, "_module", mod) |
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def __repr__(self): |
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if self._module: |
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return "<proxied module '%s'>" % self._data[0] |
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return "<unloaded module '%s'>" % self._data[0] |
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def __call__(self, *args, **kwargs): |
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raise TypeError("%s object is not callable" % repr(self)) |
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def __getattribute__(self, attr): |
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if attr in ('_data', '_extend', '_load', '_module'): |
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return object.__getattribute__(self, attr) |
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self._load() |
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return getattr(self._module, attr) |
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def __setattr__(self, attr, val): |
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self._load() |
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setattr(self._module, attr, val) |
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def _demandimport(name, globals=None, locals=None, fromlist=None, level=-1): |
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if not locals or name in ignore or fromlist == ('*',): |
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# these cases we can't really delay |
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return _import(name, globals, locals, fromlist, level) |
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elif not fromlist: |
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# import a [as b] |
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if '.' in name: # a.b |
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base, rest = name.split('.', 1) |
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# email.__init__ loading email.mime |
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if globals and globals.get('__name__', None) == base: |
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return _import(name, globals, locals, fromlist, level) |
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# if a is already demand-loaded, add b to its submodule list |
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if base in locals: |
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if isinstance(locals[base], _demandmod): |
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locals[base]._extend(rest) |
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return locals[base] |
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return _demandmod(name, globals, locals) |
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else: |
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if level != -1: |
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# from . import b,c,d or from .a import b,c,d |
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return _origimport(name, globals, locals, fromlist, level) |
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# from a import b,c,d |
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mod = _origimport(name, globals, locals) |
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# recurse down the module chain |
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for comp in name.split('.')[1:]: |
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if getattr(mod, comp, nothing) is nothing: |
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setattr(mod, comp, _demandmod(comp, mod.__dict__, mod.__dict__)) |
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mod = getattr(mod, comp) |
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for x in fromlist: |
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# set requested submodules for demand load |
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if getattr(mod, x, nothing) is nothing: |
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setattr(mod, x, _demandmod(x, mod.__dict__, locals)) |
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return mod |
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ignore = [ |
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'_hashlib', |
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'_xmlplus', |
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'fcntl', |
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'win32com.gen_py', |
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'_winreg', # 2.7 mimetypes needs immediate ImportError |
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'pythoncom', |
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# imported by tarfile, not available under Windows |
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'pwd', |
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'grp', |
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# imported by profile, itself imported by hotshot.stats, |
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# not available under Windows |
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'resource', |
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# this trips up many extension authors |
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'gtk', |
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# setuptools' pkg_resources.py expects "from __main__ import x" to |
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# raise ImportError if x not defined |
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'__main__', |
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144 |
'_ssl', # conditional imports in the stdlib, issue1964 |
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'rfc822', |
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'mimetools', |
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147 |
] |
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|
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149 |
def enable(): |
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"enable global demand-loading of modules" |
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151 |
__builtin__.__import__ = _demandimport |
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152 |
|
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def disable(): |
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"disable global demand-loading of modules" |
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__builtin__.__import__ = _origimport |