--- /dev/null
+class FilterBase:
+ def __init__(self, verbose):
+ self.verbose = verbose
+
+ def filter_css(self, css):
+ raise NotImplementedError
+ def filter_js(self, js):
+ raise NotImplementedError
+
+class FilterError(Exception):
+ """
+ This exception is raised when a filter fails
+ """
+ pass
\ No newline at end of file