mercurial/demandimport.py
author Gábor Stefanik <gabor.stefanik@nng.com>
Wed, 28 Oct 2015 16:27:09 +0100
branchstable
changeset 26830 65387a30430e
parent 26457 7e81305092a0
child 26873 78d05778907b
permissions -rw-r--r--
demandimport: fix TypeError when importing Python regex library (issue4920)
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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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from __future__ import absolute_import
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import contextlib
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import os
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import sys
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# __builtin__ in Python 2, builtins in Python 3.
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try:
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    import __builtin__ as builtins
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except ImportError:
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    import builtins
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contextmanager = contextlib.contextmanager
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_origimport = __import__
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nothing = object()
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# Python 3 doesn't have relative imports nor level -1.
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level = -1
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if sys.version_info[0] >= 3:
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    level = 0
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_import = _origimport
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def _hgextimport(importfunc, name, globals, *args, **kwargs):
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    try:
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        return importfunc(name, globals, *args, **kwargs)
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    except ImportError:
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        if not globals:
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            raise
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        # extensions are loaded with "hgext_" prefix
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        hgextname = 'hgext_%s' % name
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        nameroot = hgextname.split('.', 1)[0]
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        contextroot = globals.get('__name__', '').split('.', 1)[0]
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        if nameroot != contextroot:
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            raise
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        # retry to import with "hgext_" prefix
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        return importfunc(hgextname, globals, *args, **kwargs)
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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, level=level):
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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",
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                           (head, globals, locals, after, level, set()))
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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 _addref(self, name):
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        """Record that the named module ``name`` imports this module.
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        References to this proxy class having the name of this module will be
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        replaced at module load time. We assume the symbol inside the importing
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        module is identical to the "head" name of this module. We don't
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        actually know if "as X" syntax is being used to change the symbol name
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        because this information isn't exposed to __import__.
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        """
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        self._data[5].add(name)
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    def _load(self):
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        if not self._module:
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            head, globals, locals, after, level, modrefs = self._data
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            mod = _hgextimport(_import, head, globals, locals, None, level)
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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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            # Replace references to this proxy instance with the actual module.
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            if locals and locals.get(head) == self:
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                locals[head] = mod
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            for modname in modrefs:
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                modref = sys.modules.get(modname, None)
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                if modref and getattr(modref, head, None) == self:
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                    setattr(modref, 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', '_addref'):
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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=level):
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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 _hgextimport(_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, level)
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    else:
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        # There is a fromlist.
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        # from a import b,c,d
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        # from . import b,c,d
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        # from .a import b,c,d
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        # level == -1: relative and absolute attempted (Python 2 only).
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        # level >= 0: absolute only (Python 2 w/ absolute_import and Python 3).
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        # The modern Mercurial convention is to use absolute_import everywhere,
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        # so modern Mercurial code will have level >= 0.
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        # The name of the module the import statement is located in.
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        globalname = globals.get('__name__')
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        def processfromitem(mod, attr, **kwargs):
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            """Process an imported symbol in the import statement.
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            If the symbol doesn't exist in the parent module, it must be a
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            module. We set missing modules up as _demandmod instances.
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            """
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            symbol = getattr(mod, attr, nothing)
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            if symbol is nothing:
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                symbol = _demandmod(attr, mod.__dict__, locals, **kwargs)
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                setattr(mod, attr, symbol)
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            # Record the importing module references this symbol so we can
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            # replace the symbol with the actual module instance at load
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            # time.
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            if globalname and isinstance(symbol, _demandmod):
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                symbol._addref(globalname)
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        if level >= 0:
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            # Mercurial's enforced import style does not use
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            # "from a import b,c,d" or "from .a import b,c,d" syntax. In
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            # addition, this appears to be giving errors with some modules
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            # for unknown reasons. Since we shouldn't be using this syntax
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            # much, work around the problems.
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            if name:
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                return _hgextimport(_origimport, name, globals, locals,
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                                    fromlist, level)
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            mod = _hgextimport(_origimport, name, globals, locals, level=level)
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            for x in fromlist:
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                processfromitem(mod, x, level=level)
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            return mod
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        # But, we still need to support lazy loading of standard library and 3rd
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        # party modules. So handle level == -1.
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        mod = _hgextimport(_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,
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                        _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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            processfromitem(mod, x)
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        return mod
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ignore = [
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    '__future__',
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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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    '_ssl', # conditional imports in the stdlib, issue1964
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    '_sre', # issue4920
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    'rfc822',
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    'mimetools',
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    # setuptools 8 expects this module to explode early when not on windows
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    'distutils.msvc9compiler'
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    ]
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def isenabled():
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    return builtins.__import__ == _demandimport
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def enable():
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    "enable global demand-loading of modules"
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    if os.environ.get('HGDEMANDIMPORT') != 'disable':
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        builtins.__import__ = _demandimport
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def disable():
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    "disable global demand-loading of modules"
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    builtins.__import__ = _origimport
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@contextmanager
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def deactivated():
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    "context manager for disabling demandimport in 'with' blocks"
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    demandenabled = isenabled()
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    if demandenabled:
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        disable()
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parents: 23643
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   261
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parents: 23643
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    try:
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        yield
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parents: 23643
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   264
    finally:
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parents: 23643
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   265
        if demandenabled:
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parents: 23643
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   266
            enable()