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Viewing changes to pypy/objspace/cpy/property.py

  • Committer: Bazaar Package Importer
  • Author(s): Alexandre Fayolle
  • Date: 2007-04-13 09:33:09 UTC
  • Revision ID: james.westby@ubuntu.com-20070413093309-yoojh4jcoocu2krz
Tags: upstream-1.0.0
Import upstream version 1.0.0

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pypy/objspace/cpy/property.py
 
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"""
 
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Support to turn GetSetProperty objects into W_Objects containing a
 
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property object of CPython.
 
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"""
 
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from pypy.interpreter.baseobjspace import SpaceCache
 
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from pypy.interpreter.gateway import ObjSpace, W_Root, interp2app
 
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from pypy.interpreter.function import BuiltinFunction
 
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from pypy.objspace.cpy.objspace import W_Object
 
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class PropertyCache(SpaceCache):
 
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    def build(cache, prop):
 
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        space = cache.space
 
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        reslist = []
 
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        for f, arity in [(prop.fget, 1),
 
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                         (prop.fset, 2),
 
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                         (prop.fdel, 1)]:
 
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            if f is None:
 
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                res = None
 
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            else:
 
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                unwrap_spec = [ObjSpace] + [W_Root]*arity
 
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                func = interp2app(f, unwrap_spec=unwrap_spec)
 
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                func = func.__spacebind__(space)
 
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                bltin = BuiltinFunction(func)
 
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                res = space.wrap(bltin).value
 
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            reslist.append(res)
 
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        # make a CPython property
 
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        p = property(reslist[0], reslist[1], reslist[2], prop.doc)
 
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        w_result = W_Object(p)
 
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        space.wrap_cache[id(w_result)] = w_result, p, follow_annotations
 
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        return w_result
 
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def follow_annotations(bookkeeper, w_property):
 
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    from pypy.annotation import model as annmodel
 
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    p = w_property.value
 
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    for f, arity, key in [(p.fget, 1, 'get'),
 
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                          (p.fset, 2, 'set'),
 
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                          (p.fdel, 1, 'del')]:
 
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        if f is not None:
 
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            s_func = bookkeeper.immutablevalue(f)
 
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            args_s = [annmodel.SomeObject()] * arity
 
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            uniquekey = p, key
 
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            bookkeeper.emulate_pbc_call(uniquekey, s_func, args_s)