Let's use a proper copy of the source instead of an external for this tag

src/Acquisition/Acquisition.h

+/*****************************************************************************
+
+  Copyright (c) 1996-2002 Zope Corporation and Contributors.
+  All Rights Reserved.
+
+  This software is subject to the provisions of the Zope Public License,
+  Version 2.1 (ZPL).  A copy of the ZPL should accompany this distribution.
+  THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
+  WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+  WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
+  FOR A PARTICULAR PURPOSE
+
+ ****************************************************************************/
+
+#ifndef __ACQUISITION_H_
+#define __ACQUISITION_H_
+
+typedef struct {
+	PyObject *(*AQ_Acquire) (PyObject *obj, PyObject *name, PyObject *filter,
+		PyObject *extra, int explicit, PyObject *deflt,
+		int containment);
+	PyObject *(*AQ_Get) (PyObject *obj, PyObject *name, PyObject *deflt,
+		int containment);
+	int (*AQ_IsWrapper) (PyObject *obj);
+	PyObject *(*AQ_Base) (PyObject *obj);
+	PyObject *(*AQ_Parent) (PyObject *obj);
+	PyObject *(*AQ_Self) (PyObject *obj);
+	PyObject *(*AQ_Inner) (PyObject *obj);
+	PyObject *(*AQ_Chain) (PyObject *obj, int containment);
+} ACQUISITIONCAPI;
+
+#ifndef _IN_ACQUISITION_C
+
+#define aq_Acquire(obj, name, filter, extra, explicit, deflt, containment ) (AcquisitionCAPI == NULL ? NULL : (AcquisitionCAPI->AQ_Acquire(obj, name, filter, extra, explicit, deflt, containment)))
+#define aq_acquire(obj, name) (AcquisitionCAPI == NULL ? NULL : (AcquisitionCAPI->AQ_Acquire(obj, name, NULL, NULL, 1, NULL, 0)))
+#define aq_get(obj, name, deflt, containment) (AcquistionCAPI == NULL ? NULL : (AcquisitionCAPI->AQ_Get(obj, name, deflt, containment)))
+#define aq_isWrapper(obj)   (AcquisitionCAPI == NULL ? -1 : (AcquisitionCAPI->AQ_IsWrapper(obj)))
+#define aq_base(obj)   (AcquisitionCAPI == NULL ? NULL : (AcquisitionCAPI->AQ_Base(obj)))
+#define aq_parent(obj) (AcquisitionCAPI == NULL ? NULL : (AcquisitionCAPI->AQ_Parent(obj)))
+#define aq_self(obj)   (AcquisitionCAPI == NULL ? NULL : (AcquisitionCAPI->AQ_Self(obj)))
+#define aq_inner(obj)  (AcquisitionCAPI == NULL ? NULL : (AcquisitionCAPI->AQ_Inner(obj)))
+#define aq_chain(obj, containment) (AcquisitionCAPI == NULL ? NULL : (AcquisitionCAPI->AQ_CHain(obj, containment)))
+
+static ACQUISITIONCAPI *AcquisitionCAPI = NULL;
+
+#define aq_init() { \
+    PyObject *module; \
+    PyObject *api; \
+    if (! (module = PyImport_ImportModule("Acquisition"))) return; \
+    if (! (api = PyObject_GetAttrString(module,"AcquisitionCAPI"))) return; \
+    Py_DECREF(module); \
+    AcquisitionCAPI = PyCObject_AsVoidPtr(api); \
+    Py_DECREF(api); \
+}
+
+
+
+#endif
+
+#endif

src/Acquisition/__init__.py

+from zope.interface import classImplements
+
+from _Acquisition import *
+from interfaces import IAcquirer
+from interfaces import IAcquisitionWrapper
+
+classImplements(Explicit, IAcquirer)
+classImplements(ExplicitAcquisitionWrapper, IAcquisitionWrapper)
+classImplements(Implicit, IAcquirer)
+classImplements(ImplicitAcquisitionWrapper, IAcquisitionWrapper)

src/Acquisition/interfaces.py

+##############################################################################
+#
+# Copyright (c) 2005 Zope Corporation and Contributors. All Rights Reserved.
+#
+# This software is subject to the provisions of the Zope Public License,
+# Version 2.1 (ZPL).  A copy of the ZPL should accompany this distribution.
+# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
+# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
+# FOR A PARTICULAR PURPOSE.
+#
+##############################################################################
+"""Acquisition z3 interfaces.
+
+$Id$
+"""
+
+from zope.interface import Attribute
+from zope.interface import Interface
+
+
+class IAcquirer(Interface):
+
+    """Acquire attributes from containers.
+    """
+
+    def __of__(context):
+        """Get the object in a context.
+        """
+
+
+class IAcquisitionWrapper(Interface):
+
+    """Wrapper object for acquisition.
+    """
+
+    def aq_acquire(name, filter=None, extra=None, explicit=True, default=0,
+                   containment=0):
+        """Get an attribute, acquiring it if necessary.
+        """
+
+    def aq_inContextOf(obj, inner=1):
+        """Test whether the object is currently in the context of the argument.
+        """
+
+    aq_base = Attribute(
+        """Get the object unwrapped."""
+        )
+
+    aq_parent = Attribute(
+        """Get the parent of an object."""
+        )
+
+    aq_self = Attribute(
+        """Get the object with the outermost wrapper removed."""
+        )
+
+    aq_inner = Attribute(
+        """Get the object with all but the innermost wrapper removed."""
+        )
+
+    aq_chain = Attribute(
+        """Get a list of objects in the acquisition environment."""
+        )