From 7de404bb4af2744a64c13e31a780fc0229b8f9e5 Mon Sep 17 00:00:00 2001
From: Chris McDonough <chrism@agendaless.com>
Date: Mon, 7 Jul 2008 04:44:57 +0000
Subject: Look up a view after traversal; adapt it to IWSGIApplication.

---
 repoze/bfg/mapply.py | 71 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 71 insertions(+)
 create mode 100644 repoze/bfg/mapply.py

(limited to 'repoze/bfg/mapply.py')

diff --git a/repoze/bfg/mapply.py b/repoze/bfg/mapply.py
new file mode 100644
index 000000000..421db2ce3
--- /dev/null
+++ b/repoze/bfg/mapply.py
@@ -0,0 +1,71 @@
+##############################################################################
+#
+# Copyright (c) 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
+#
+##############################################################################
+"""Provide an apply-like facility that works with any mapping object
+"""
+
+def mapply(object,
+           positional=(),
+           keyword={},
+           maybe=True,
+           ):
+
+    if hasattr(object,'__bases__'): # the object is a class
+        raise TypeError('Cannot publish class %s' % object)
+    else:
+        f=object
+        im=0
+        if hasattr(f, 'im_func'):
+            im=1
+        elif not hasattr(f,'func_defaults'):
+            if hasattr(f, '__call__'):
+                f=f.__call__
+                if hasattr(f, 'im_func'):
+                    im=1
+                elif not hasattr(f,'func_defaults') and maybe:
+                    return object
+            elif maybe:
+                return object
+
+        if im:
+            f=f.im_func
+            c=f.func_code
+            defaults=f.func_defaults
+            names=c.co_varnames[1:c.co_argcount]
+        else:
+            defaults=f.func_defaults
+            c=f.func_code
+            names=c.co_varnames[:c.co_argcount]
+
+    nargs=len(names)
+    if positional:
+        positional=list(positional)
+        if len(positional) > nargs:
+            raise TypeError('too many arguments')
+        args=positional
+    else:
+        args=[]
+
+    get=keyword.get
+    nrequired=len(names) - (len(defaults or ()))
+    for index in range(len(args), len(names)):
+        name=names[index]
+        v=get(name, args)
+        if v is args:
+            if index < nrequired:
+                raise TypeError('Argument %s was omitted' % name)
+            else:
+                v=defaults[index-nrequired]
+        args.append(v)
+
+    args=tuple(args)
+    return object(*args)
-- 
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