From db0727552744772f66ccab73a101a5ffc1c922e9 Mon Sep 17 00:00:00 2001
From: krasimir <krasimir@chalmers.se>
Date: Wed, 12 Aug 2015 10:11:00 +0000
Subject: [PATCH] pickling/unpickling for types

---
 src/runtime/python/pypgf.c | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/src/runtime/python/pypgf.c b/src/runtime/python/pypgf.c
index 3f950683c..bf58fd6c7 100644
--- a/src/runtime/python/pypgf.c
+++ b/src/runtime/python/pypgf.c
@@ -955,10 +955,43 @@ fail:
 	return res;
 }
 
+static PyObject*
+Type_reduce_ex(TypeObject* self, PyObject *args)
+{
+	int protocol;
+	if (!PyArg_ParseTuple(args, "i", &protocol))
+		return NULL;
+
+	PyObject* myModule = PyImport_ImportModule("pgf");
+	if (myModule == NULL)
+		return NULL;
+	PyObject* py_readType = PyObject_GetAttrString(myModule, "readType");
+	Py_DECREF(myModule);
+	if (py_readType == NULL)
+		return NULL;
+
+	PyObject* py_str = Type_repr(self);
+	if (py_str == NULL) {
+		Py_DECREF(py_readType);
+		return NULL;
+	}
+
+	PyObject* py_tuple =
+		Py_BuildValue("O(O)", py_readType, py_str);
+
+	Py_DECREF(py_str);
+	Py_DECREF(py_readType);
+
+	return py_tuple;
+}
+
 static PyMethodDef Type_methods[] = {
     {"unpack", (PyCFunction)Type_unpack, METH_VARARGS,
      "Decomposes a type into its components"
     },
+    {"__reduce_ex__", (PyCFunction)Type_reduce_ex, METH_VARARGS,
+     "This method allows for transparent pickling/unpickling of types."
+    },
     {NULL}  /* Sentinel */
 };