1 files changed, 43 insertions, 0 deletions
diff --git a/lib/sqlalchemy/cyextension/util.pyx b/lib/sqlalchemy/cyextension/util.pyx
new file mode 100644
index 000000000..ac15ff9de
--- /dev/null
+++ b/lib/sqlalchemy/cyextension/util.pyx
@@ -0,0 +1,43 @@
+from collections.abc import Mapping
+
+from sqlalchemy import exc
+
+cdef tuple _Empty_Tuple = ()
+
+cdef inline bint _mapping_or_tuple(object value):
+    return isinstance(value, dict) or isinstance(value, tuple) or isinstance(value, Mapping)
+
+cdef inline bint _check_item(object params) except 0:
+    cdef object item
+    cdef bint ret = 1
+    if params:
+        item = params[0]
+        if not _mapping_or_tuple(item):
+            ret = 0
+            raise exc.ArgumentError(
+                "List argument must consist only of tuples or dictionaries"
+            )
+    return ret
+
+def _distill_params_20(object params):
+    if params is None:
+        return _Empty_Tuple
+    elif isinstance(params, list) or isinstance(params, tuple):
+        _check_item(params)
+        return params
+    elif isinstance(params, dict) or isinstance(params, Mapping):
+        return [params]
+    else:
+        raise exc.ArgumentError("mapping or list expected for parameters")
+
+
+def _distill_raw_params(object params):
+    if params is None:
+        return _Empty_Tuple
+    elif isinstance(params, list):
+        _check_item(params)
+        return params
+    elif _mapping_or_tuple(params):
+        return [params]
+    else:
+        raise exc.ArgumentError("mapping or sequence expected for parameters")