classes.py.svn-base

moses开源的机器翻译系统

###########################################################################
# 
#  Psyco class support module.
#   Copyright (C) 2001-2002  Armin Rigo et.al.

"""Psyco class support module.

'psyco.classes.psyobj' is an alternate Psyco-optimized root for classes.
Any class inheriting from it or using the metaclass '__metaclass__' might
get optimized specifically for Psyco. It is equivalent to call
psyco.bind() on the class object after its creation.

Note that this module has no effect with Python version 2.1 or earlier.

Importing everything from psyco.classes in a module will import the
'__metaclass__' name, so all classes defined after a

       from psyco.classes import *

will automatically use the Psyco-optimized metaclass.
"""
###########################################################################

__all__ = ['psyobj', 'psymetaclass', '__metaclass__']


# Python version check
try:
    from _psyco import compacttype
except ImportError:
    class psyobj:        # compatilibity
        pass
    psymetaclass = None
else:
    # version >= 2.2 only

    import core
    from types import FunctionType

    class psymetaclass(compacttype):
        "Psyco-optimized meta-class. Turns all methods into Psyco proxies."

        def __new__(cls, name, bases, dict):
            bindlist = dict.get('__psyco__bind__')
            if bindlist is None:
                bindlist = [key for key, value in dict.items()
                            if isinstance(value, FunctionType)]
            for attr in bindlist:
                dict[attr] = core.proxy(dict[attr])
            return super(psymetaclass, cls).__new__(cls, name, bases, dict)
    
    psyobj = psymetaclass("psyobj", (), {})
__metaclass__ = psymetaclass