1 files changed, 79 insertions, 0 deletions
diff --git a/python/py_expr.cc b/python/py_expr.cc
index e4230377..07f390af 100644
--- a/python/py_expr.cc
+++ b/python/py_expr.cc
@@ -64,3 +64,82 @@ void export_expr()
 }
 
 } // namespace ledger
+
+#if 0
+value_t py_calc_1(xpath_t::op_t& xpath_t, const details_t& item)
+{
+  value_t result;
+  xpath_t.calc(result, item);
+  return result;
+}
+
+template <typename T>
+value_t py_calc(xpath_t::op_t& xpath_t, const T& item)
+{
+  value_t result;
+  xpath_t.calc(result, details_t(item));
+  return result;
+}
+
+xpath_t::op_t * py_parse_xpath_t_1(const string& str)
+{
+  return parse_xpath_t(str);
+}
+
+#define EXC_TRANSLATOR(type)				\
+  void exc_translate_ ## type(const type& err) {	\
+    PyErr_SetString(PyExc_RuntimeError, err.what());	\
+  }
+
+EXC_TRANSLATOR(xpath_t_error)
+EXC_TRANSLATOR(calc_error)
+#if 0
+EXC_TRANSLATOR(mask_error)
+#endif
+
+void export_xpath()
+{
+  class_< details_t > ("Details", init<const entry_t&>())
+    .def(init<const transaction_t&>())
+    .def(init<const account_t&>())
+    .add_property("entry",
+		  make_getter(&details_t::entry,
+			      return_value_policy<reference_existing_object>()))
+    .add_property("xact",
+		  make_getter(&details_t::xact,
+			      return_value_policy<reference_existing_object>()))
+    .add_property("account",
+		  make_getter(&details_t::account,
+			      return_value_policy<reference_existing_object>()))
+    ;
+
+  class_< xpath_t::op_t > ("ValueExpr", init<xpath_t::op_t::kind_t>())
+    .def("calc", py_calc_1)
+    .def("calc", py_calc<account_t>)
+    .def("calc", py_calc<entry_t>)
+    .def("calc", py_calc<transaction_t>)
+    ;
+
+  def("parse_xpath_t", py_parse_xpath_t_1,
+      return_value_policy<manage_new_object>());
+
+  class_< item_predicate<transaction_t> >
+    ("TransactionPredicate", init<string>())
+    .def("__call__", &item_predicate<transaction_t>::operator())
+    ;
+
+  class_< item_predicate<account_t> >
+    ("AccountPredicate", init<string>())
+    .def("__call__", &item_predicate<account_t>::operator())
+    ;
+
+#define EXC_TRANSLATE(type)					\
+  register_error_translator<type>(&exc_translate_ ## type);
+
+  EXC_TRANSLATE(xpath_t_error);
+  EXC_TRANSLATE(calc_error);
+#if 0
+  EXC_TRANSLATE(mask_error);
+#endif
+}
+#endif