[Subversion] / DecoratorTools / peak / util / decorators.py  

Diff of /DecoratorTools/peak/util/decorators.py

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version 2726, Fri Apr 3 23:28:24 2015 UTC version 2727, Fri Apr 3 23:33:46 2015 UTC
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 from types import ClassType, FunctionType  from types import FunctionType
 import sys, os  import sys, os
 __all__ = [  __all__ = [
     'decorate_class', 'metaclass_is_decorator', 'metaclass_for_bases',      'decorate_class', 'metaclass_is_decorator', 'metaclass_for_bases',
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     tracers_for = lambda f: [f.f_trace]      tracers_for = lambda f: [f.f_trace]
   
   
   def with_metaclass(meta, *bases):
       """Python 2/3-compatible metaclass spelling; internal use only"""
       class tmp(type):
           def __new__(cls, name, _bases, cdict):
               return meta(name, bases, cdict)
       return type.__new__(tmp, 'tmp', (), {})
   
   
   
   
   
   try:
       old_build_class = __build_class__
   except NameError:
       # Python 2
       from types import ClassType
       NEXT, GLOBALS, DEFAULTS = 'next', 'func_globals', 'func_defaults'
   else:
       # Python 3
       ClassType = type
       NEXT, GLOBALS, DEFAULTS = '__next__', '__globals__', '__defaults__'
   
       def apply_decorators(cls, advice):
           if metaclass_is_decorator(advice):
               cls = advice.callback(
                   apply_decorators(cls, advice.previousMetaclass)
               )
           return cls
   
       def py3_build_class(func, name, *bases, **kw):
           cls = old_build_class(func, name, *bases, **kw)
           advice = cls.__dict__.get('__metaclass__', None)
           decorated = apply_decorators(cls, advice)
           if '__metaclass__' in cls.__dict__:
               try:
                   del cls.__metaclass__
               except TypeError:
                   pass
           return decorated
   
       getattr(__builtins__,'__dict__',__builtins__)[
           '__build_class__'
       ] = py3_build_class
   
   
   
   
   
   
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     filename = "<%s wrapping %s at 0x%08X>" % (qname(wrapper), qname(func), id(func))      filename = "<%s wrapping %s at 0x%08X>" % (qname(wrapper), qname(func), id(func))
     d ={}      d ={}
     exec compile(body, filename, "exec") in func.func_globals, d      exec(compile(body, filename, "exec"), getattr(func, GLOBALS), d)
   
     f = d[wrapname](func, *args, **kw)      f = d[wrapname](func, *args, **kw)
     cache_source(filename, body, f)      cache_source(filename, body, f)
   
     f.func_defaults = func.func_defaults      setattr(f, DEFAULTS, getattr(func, DEFAULTS))
     f.__doc__  = func.__doc__      f.__doc__  = func.__doc__
     f.__dict__ = func.__dict__      f.__dict__ = func.__dict__
     return f      return f
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     defaultMetaclass  = caller_globals.get('__metaclass__', ClassType)      defaultMetaclass  = caller_globals.get('__metaclass__', ClassType)
   
   
     def advise(name,bases,cdict):      def advise(name,bases,cdict,**kw):
   
         if '__metaclass__' in cdict:          if '__metaclass__' in cdict:
             del cdict['__metaclass__']              del cdict['__metaclass__']
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         else:          else:
             meta = metaclass_for_bases(bases, previousMetaclass)              meta = metaclass_for_bases(bases, previousMetaclass)
   
         newClass = meta(name,bases,cdict)          newClass = meta(name,bases,cdict,**kw)
   
         # this lets the decorator replace the class completely, if it wants to          # this lets the decorator replace the class completely, if it wants to
         return decorator(newClass)          return decorator(newClass)
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 def super_next(cls, attr):  def super_next(cls, attr):
     for c in cls.__mro__:      for c in cls.__mro__:
         if attr in c.__dict__:          if attr in c.__dict__:
             yield getattr(c, attr).im_func              meth = getattr(c, attr)
               yield getattr(meth, 'im_func', meth)
   
 # Python 2.6 and above mix ABCMeta into various random places  :-(  # Python 2.6 and above mix ABCMeta into various random places  :-(
 try:  try:
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     def __new__(meta, name, bases, cdict):      def __new__(meta, name, bases, cdict):
         cls = super(classy_class, meta).__new__(meta, name, bases, cdict)          cls = super(classy_class, meta).__new__(meta, name, bases, cdict)
         supr = super_next(cls, '__class_new__').next          supr = getattr(super_next(cls, '__class_new__'), NEXT)
         return supr()(meta, name, bases, cdict, supr)          return supr()(meta, name, bases, cdict, supr)
   
     def __init__(cls, name, bases, cdict):      def __init__(cls, name, bases, cdict):
         supr = super_next(cls, '__class_init__').next          supr = getattr(super_next(cls, '__class_init__'), NEXT)
         return supr()(cls, name, bases, cdict, supr)          return supr()(cls, name, bases, cdict, supr)
   
     def __call__(cls, *args, **kw):      def __call__(cls, *args, **kw):
         return cls.__class_call__.im_func(cls, *args, **kw)          return cls.__class_call__(*args, **kw)
   
     if base is not type:      if base is not type:
         # Our instances do not support ABC-ness          # Our instances do not support ABC-ness
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Line 736 
   
   
   
   class classy(with_metaclass(classy_class)):
 class classy(object):  
     """Base class for classes that want to be their own metaclass"""      """Base class for classes that want to be their own metaclass"""
     __metaclass__ = classy_class  
     __slots__ = ()      __slots__ = ()
   
     def __class_new__(meta, name, bases, cdict, supr):      def __class_new__(meta, name, bases, cdict, supr):
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Line 749 
   
     def __class_call__(cls, *args, **kw):      def __class_call__(cls, *args, **kw):
         return type.__call__(cls, *args, **kw)          return type.__call__(cls, *args, **kw)
     __class_call__ = classmethod(__class_call__)  
   
       __class_call__ = classmethod(__class_call__)
   
   
   

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