1 files changed, 25 insertions, 0 deletions
diff --git a/Lib/fontTools/subset/util.py b/Lib/fontTools/subset/util.py
new file mode 100644
index 00000000..d20e925d
--- /dev/null
+++ b/Lib/fontTools/subset/util.py
@@ -0,0 +1,25 @@
+"""Private utility methods used by the subset modules"""
+
+
+def _add_method(*clazzes):
+    """Returns a decorator function that adds a new method to one or
+    more classes."""
+
+    def wrapper(method):
+        done = []
+        for clazz in clazzes:
+            if clazz in done:
+                continue  # Support multiple names of a clazz
+            done.append(clazz)
+            assert clazz.__name__ != "DefaultTable", "Oops, table class not found."
+            assert not hasattr(
+                clazz, method.__name__
+            ), "Oops, class '%s' has method '%s'." % (clazz.__name__, method.__name__)
+            setattr(clazz, method.__name__, method)
+        return None
+
+    return wrapper
+
+
+def _uniq_sort(l):
+    return sorted(set(l))