Mercurial > hg
view mercurial/demandimport.py @ 9469:7f0f882af23d
config: abort on indented non-continuation lines (issue1829)
Previously, as soon as a continuation would be met, "cont" would stay
forever set to True, but "item" was set back to "None".
This caused the continuation code bits to run every time, until the next
"self.get(section, item) + '\n'" which would crash.
author | Nicolas Dumazet <nicdumz.commits@gmail.com> |
---|---|
date | Sat, 12 Sep 2009 11:17:07 +0200 |
parents | fb66a7d3f28f |
children | ffeaf5ba25d8 |
line wrap: on
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# demandimport.py - global demand-loading of modules for Mercurial # # Copyright 2006, 2007 Matt Mackall <mpm@selenic.com> # # This software may be used and distributed according to the terms of the # GNU General Public License version 2, incorporated herein by reference. ''' demandimport - automatic demandloading of modules To enable this module, do: import demandimport; demandimport.enable() Imports of the following forms will be demand-loaded: import a, b.c import a.b as c from a import b,c # a will be loaded immediately These imports will not be delayed: from a import * b = __import__(a) ''' import __builtin__ _origimport = __import__ class _demandmod(object): """module demand-loader and proxy""" def __init__(self, name, globals, locals): if '.' in name: head, rest = name.split('.', 1) after = [rest] else: head = name after = [] object.__setattr__(self, "_data", (head, globals, locals, after)) object.__setattr__(self, "_module", None) def _extend(self, name): """add to the list of submodules to load""" self._data[3].append(name) def _load(self): if not self._module: head, globals, locals, after = self._data mod = _origimport(head, globals, locals) # load submodules def subload(mod, p): h, t = p, None if '.' in p: h, t = p.split('.', 1) if not hasattr(mod, h): setattr(mod, h, _demandmod(p, mod.__dict__, mod.__dict__)) elif t: subload(getattr(mod, h), t) for x in after: subload(mod, x) # are we in the locals dictionary still? if locals and locals.get(head) == self: locals[head] = mod object.__setattr__(self, "_module", mod) def __repr__(self): if self._module: return "<proxied module '%s'>" % self._data[0] return "<unloaded module '%s'>" % self._data[0] def __call__(self, *args, **kwargs): raise TypeError("%s object is not callable" % repr(self)) def __getattribute__(self, attr): if attr in ('_data', '_extend', '_load', '_module'): return object.__getattribute__(self, attr) self._load() return getattr(self._module, attr) def __setattr__(self, attr, val): self._load() setattr(self._module, attr, val) def _demandimport(name, globals=None, locals=None, fromlist=None, level=None): if not locals or name in ignore or fromlist == ('*',): # these cases we can't really delay if level is None: return _origimport(name, globals, locals, fromlist) else: return _origimport(name, globals, locals, fromlist, level) elif not fromlist: # import a [as b] if '.' in name: # a.b base, rest = name.split('.', 1) # email.__init__ loading email.mime if globals and globals.get('__name__', None) == base: return _origimport(name, globals, locals, fromlist) # if a is already demand-loaded, add b to its submodule list if base in locals: if isinstance(locals[base], _demandmod): locals[base]._extend(rest) return locals[base] return _demandmod(name, globals, locals) else: if level is not None: # from . import b,c,d or from .a import b,c,d return _origimport(name, globals, locals, fromlist, level) # from a import b,c,d mod = _origimport(name, globals, locals) # recurse down the module chain for comp in name.split('.')[1:]: if not hasattr(mod, comp): setattr(mod, comp, _demandmod(comp, mod.__dict__, mod.__dict__)) mod = getattr(mod, comp) for x in fromlist: # set requested submodules for demand load if not(hasattr(mod, x)): setattr(mod, x, _demandmod(x, mod.__dict__, locals)) return mod ignore = [ '_hashlib', '_xmlplus', 'fcntl', 'win32com.gen_py', 'pythoncom', # imported by tarfile, not available under Windows 'pwd', 'grp', # imported by profile, itself imported by hotshot.stats, # not available under Windows 'resource', ] def enable(): "enable global demand-loading of modules" __builtin__.__import__ = _demandimport def disable(): "disable global demand-loading of modules" __builtin__.__import__ = _origimport