Count document.createEvent() usage

third_party/WebKit/Source/build/scripts/make_event_factory.py

 #!/usr/bin/env python
 # Copyright (C) 2013 Google Inc. All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 # notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
@@ skipping 29 matching lines @@
 
 #ifndef %(namespace)s%(suffix)sHeaders_h
 #define %(namespace)s%(suffix)sHeaders_h
 %(base_header_for_suffix)s
 %(includes)s
 
 #endif // %(namespace)s%(suffix)sHeaders_h
 """
 
 
+# The list is a close match to:
+#
+# https://dom.spec.whatwg.org/#dom-document-createevent
+#
+# with the exepction for |keyevents| not present in Blink.

[philipj_slow, 2016/02/13 14:29:58]

https://github.com/whatwg/dom/issues/148

 def case_insensitive_matching(name):
     return (name == ('HTMLEvents')
             or name == 'Event'
             or name == 'Events'
             or name.startswith('UIEvent')
             or name.startswith('CustomEvent')
             or name == 'KeyboardEvent'
             or name == 'MessageEvent'
             or name.startswith('MouseEvent')
             or name == 'TouchEvent')
 
 
+# All events not on the following whitelist are being measured in
+# createEvent. The plan is to limit createEvent to just a few selected
+# events necessary for legacy content in accordance with the
+# specification:
+#
+# https://dom.spec.whatwg.org/#dom-document-createevent
+def candidate_whitelist(name):
+    return (case_insensitive_matching(name)
+            or name == 'SVGZoomEvent'  # Will be deprecated instead.
+            or name == 'SVGZoomEvents')  # Will be deprecated instead.
+
+
+def measure_name(name):
+    return 'DocumentCreateEvent' + name
+
 class EventFactoryWriter(in_generator.Writer):
     defaults = {
         'ImplementedAs': None,
         'RuntimeEnabled': None,
     }
     default_parameters = {
         'export': '',
         'namespace': '',
         'suffix': '',
     }
     filters = {
         'cpp_name': name_utilities.cpp_name,
         'lower_first': name_utilities.lower_first,
         'case_insensitive_matching': case_insensitive_matching,
         'script_name': name_utilities.script_name,
+        'candidate_whitelist': candidate_whitelist,
+        'measure_name': measure_name,
     }
 
     def __init__(self, in_file_path):
         super(EventFactoryWriter, self).__init__(in_file_path)
         self.namespace = self.in_file.parameters['namespace'].strip('"')
         self.suffix = self.in_file.parameters['suffix'].strip('"')
         self._validate_entries()
         self._outputs = {(self.namespace + self.suffix + "Headers.h"): self.generate_headers_header,
                          (self.namespace + self.suffix + ".cpp"): self.generate_implementation,
                         }
@@ skipping 60 matching lines @@
     def generate_implementation(self):
         return {
             'namespace': self.namespace,
             'suffix': self.suffix,
             'events': self.in_file.name_dictionaries,
         }
 
 
 if __name__ == "__main__":
     in_generator.Maker(EventFactoryWriter).main(sys.argv)