Author: Ronan Lamy <ronan.l...@gmail.com>
Branch:
Changeset: r74318:ffce4c795283
Date: 2014-10-31 21:39 +0000
http://bitbucket.org/pypy/pypy/changeset/ffce4c795283/
Log: Extract is_mixin() function
diff --git a/rpython/annotator/description.py b/rpython/annotator/description.py
--- a/rpython/annotator/description.py
+++ b/rpython/annotator/description.py
@@ -388,6 +388,9 @@
return s_sigs
+def is_mixin(cls):
+ return cls.__dict__.get('_mixin_', False)
+
NODEFAULT = object()
class ClassDesc(Desc):
@@ -414,14 +417,13 @@
self.specialize = specialize
self._classdefs = {}
- assert cls.__module__ != '__builtin__'
- base = object
- baselist = list(cls.__bases__)
-
- if cls.__dict__.get('_mixin_', False):
+ if is_mixin(cls):
raise AnnotatorError("cannot use directly the class %r because "
"it is a _mixin_" % (cls,))
+ assert cls.__module__ != '__builtin__'
+ baselist = list(cls.__bases__)
+
# special case: skip BaseException, and pretend
# that all exceptions ultimately inherit from Exception instead
# of BaseException (XXX hack)
@@ -432,10 +434,11 @@
mixins_before = []
mixins_after = []
+ base = object
for b1 in baselist:
if b1 is object:
continue
- if b1.__dict__.get('_mixin_', False):
+ if is_mixin(b1):
if base is object:
mixins_before.append(b1)
else:
@@ -539,7 +542,7 @@
add(check_not_in)
#
for base in reversed(mro):
- assert base.__dict__.get("_mixin_", False), (
+ assert is_mixin(base), (
"Mixin class %r has non mixin base class %r" % (mixins, base))
for name, value in base.__dict__.items():
if name in skip:
diff --git a/rpython/annotator/test/test_description.py
b/rpython/annotator/test/test_description.py
--- a/rpython/annotator/test/test_description.py
+++ b/rpython/annotator/test/test_description.py
@@ -1,4 +1,4 @@
-from rpython.annotator.description import ClassDesc
+from rpython.annotator.description import ClassDesc, is_mixin
class FakeBookkeeper:
def __init__(self):
@@ -20,3 +20,13 @@
dC = bk.getdesc(C)
dD = bk.getdesc(D)
assert ClassDesc.getcommonbase([dC, dD]) is dA
+
+def test_is_mixin():
+ class Mixin1(object):
+ _mixin_ = True
+
+ class A(Mixin1):
+ pass
+
+ assert is_mixin(Mixin1)
+ assert not is_mixin(A)
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