1 files changed, 42 insertions, 0 deletions
diff --git a/src/buildstream/_utils.pyx b/src/buildstream/_utils.pyx
new file mode 100644
index 000000000..797794eba
--- /dev/null
+++ b/src/buildstream/_utils.pyx
@@ -0,0 +1,42 @@
+#
+#  Copyright (C) 2019 Bloomberg L.P.
+#
+#  This program is free software; you can redistribute it and/or
+#  modify it under the terms of the GNU Lesser General Public
+#  License as published by the Free Software Foundation; either
+#  version 2 of the License, or (at your option) any later version.
+#
+#  This library is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the GNU
+#  Lesser General Public License for more details.
+#
+#  You should have received a copy of the GNU Lesser General Public
+#  License along with this library. If not, see <http://www.gnu.org/licenses/>.
+#
+#  Authors:
+#        Benjamin Schubert <bschubert15@bloomberg.net>
+#
+
+"""
+This module contains utilities that have been optimized in Cython
+"""
+
+import string
+
+cdef str VALID_DIRECTORY_CHARS = string.digits + string.ascii_letters + "%_"
+
+
+def url_directory_name(str url):
+    """Normalizes a url into a directory name
+
+    Args:
+       url (str): A url string
+
+    Returns:
+       A string which can be used as a directory name
+    """
+    def transl(x):
+        return x if x in VALID_DIRECTORY_CHARS else '_'
+
+    return ''.join([transl(x) for x in url])
+\ No newline at end of file