OSQA-266

[osqa.git] / forum / modules / decorators.py

diff --git a/forum/modules/decorators.py b/forum/modules/decorators.py
index 17d248b1559b378f950da64f53e87404afe2f1a8..8fbee7e30d4b19c9475a77da0b682051e6753e86 100644 (file)
--- a/forum/modules/decorators.py
+++ b/forum/modules/decorators.py
@@ -1,53 +1,112 @@
 import inspect\r
 \r
 class DecoratableObject(object):\r
 import inspect\r
 \r
 class DecoratableObject(object):\r

+    MODE_OVERRIDE = 0\r
+    MODE_PARAMS = 1\r
+    MODE_RESULT = 2\r
+\r

     def __init__(self, fn):\r
     def __init__(self, fn):\r

+        a = inspect.getargspec(fn)\r

         self._callable = fn\r
         self._callable = fn\r

+        self._params_decoration = None\r
+        self._result_decoration = None\r

 \r
 \r

-    def decorate(self, fn, needs_origin):\r
+    def _decorate(self, fn, needs_origin, method=False):\r

         origin = self._callable\r
 \r
         if needs_origin:\r
         origin = self._callable\r
 \r
         if needs_origin:\r

-            self._callable = lambda *args, **kwargs: fn(origin, *args, **kwargs)\r
+            if method:\r
+                self._callable = lambda inst, *args, **kwargs: fn(inst, origin, *args, **kwargs)\r
+            else:\r
+                self._callable = lambda *args, **kwargs: fn(origin, *args, **kwargs)\r

         else:\r
         else:\r

-            self._callable = lambda *args, **kwargs: fn(*args, **kwargs)\r
+            self._callable = fn\r

 \r
 \r

-    def __call__(self, *args, **kwargs):\r
-        return self._callable(*args, **kwargs)\r
+    def _decorate_params(self, fn):\r
+        if not self._params_decoration:\r
+            self._params_decoration = []\r

 \r
 \r

+        self._params_decoration.append(fn)\r

 \r
 \r

-def decoratable(fn):\r
-    return DecoratableObject(fn)\r
+    def _decorate_result(self, fn):\r
+        if not self._result_decoration:\r
+            self._result_decoration = []\r

 \r
 \r

-def decoratable_method(fn):\r
-    obj = DecoratableObject(fn)\r
-    def decorated(self, *args, **kwargs):\r
-        return obj(self, *args, **kwargs)\r
+        self._result_decoration.append(fn)\r

 \r
 \r

-    decorated.__obj = obj\r
-    return decorated\r
+    def __call__(self, *args, **kwargs):\r
+        if self._params_decoration:\r
+            for dec in self._params_decoration:\r
+                args, kwargs = dec(*args, **kwargs)\r

 \r
 \r

-decoratable.method = decoratable_method\r
+        res = self._callable(*args, **kwargs)\r

 \r
 \r

-def decorate(origin, needs_origin=True):\r
-    if not isinstance(origin, DecoratableObject):\r
-        if hasattr(origin, '__obj'):\r
-            def decorator(fn):\r
-                origin.__obj.decorate(fn, needs_origin)\r
-                return origin\r
-            return decorator\r
+        if self._result_decoration:\r
+            for dec in self._result_decoration:\r
+                res = dec(res)\r
+\r
+        return res\r

 \r
 \r

-        raise Exception('Not an decoratable function: %s' % origin.name)\r

 \r
 \r

+def _create_decorator(origin, needs_origin, mode, method=False):\r

     def decorator(fn):\r
     def decorator(fn):\r

-        origin.decorate(fn, needs_origin)\r
-        return origin\r
+        if mode == DecoratableObject.MODE_OVERRIDE:\r
+            origin._decorate(fn, needs_origin, method=method)\r
+        elif mode == DecoratableObject.MODE_PARAMS:\r
+            origin._decorate_params(fn)\r
+        elif mode == DecoratableObject.MODE_RESULT:\r
+            origin._decorate_result(fn)\r
+\r
+        return fn\r

 \r
     return decorator\r
 \r
 \r
 \r
     return decorator\r
 \r
 \r

+def _decorate_method(origin, needs_origin, mode):\r
+    if not hasattr(origin, '_decoratable_obj'):\r
+        name = origin.__name__\r
+        cls = origin.im_class\r
+\r
+        decoratable = DecoratableObject(origin)\r
+\r
+        def decoratable_method(self, *args, **kwargs):\r
+            return decoratable(self, *args, **kwargs)\r
+\r
+        decoratable_method._decoratable_obj = decoratable\r
+        setattr(cls, name, decoratable_method)\r
+    else:\r
+        decoratable = origin._decoratable_obj\r
+\r
+    return _create_decorator(decoratable, needs_origin, mode, method=True)\r
+\r
+def _decorate_function(origin, needs_origin, mode):\r
+    if not isinstance(origin, DecoratableObject):\r
+        mod = inspect.getmodule(origin)\r
+\r
+        name = origin.__name__\r
+        origin = DecoratableObject(origin)\r
+        setattr(mod, name, origin)\r
+\r
+    return _create_decorator(origin, needs_origin, mode)\r
+\r
+\r
+def decorate(origin, needs_origin=True, mode=DecoratableObject.MODE_OVERRIDE):\r
+    if inspect.ismethod(origin):\r
+        return _decorate_method(origin, needs_origin, mode)\r
+\r
+    if inspect.isfunction(origin) or isinstance(origin, DecoratableObject):\r
+        return _decorate_function(origin, needs_origin, mode)\r
+\r
+    def decorator(fn):\r
+        return fn\r

 \r
 \r
 \r
 \r

+def _decorate_params(origin):\r
+    return decorate(origin, mode=DecoratableObject.MODE_PARAMS)\r

 \r
 \r

+decorate.params = _decorate_params\r

 \r
 \r

+def _decorate_result(origin):\r
+    return decorate(origin, mode=DecoratableObject.MODE_RESULT)\r

 \r
 \r

+decorate.result = _decorate_result\r