fixup! Only initialize the method dispatcher once

Author: gsnedders

html5lib/html5parser.py

@@ -457,6 +457,10 @@ def processStartTag(self, token):
                 func = self.__startTagCache[name]
             except KeyError:
                 func = self.__startTagCache[name] = self.startTagHandler[name]
+                # bound the cache size in case we get loads of unknown tags
+                while len(self.__startTagCache) > len(self.startTagHandler) * 1.1:
+                    # this makes the eviction policy random on Py < 3.7 and FIFO >= 3.7
+                    self.__startTagCache.pop(next(iter(self.__startTagCache)))
             return func(token)
 
         def startTagHtml(self, token):
@@ -475,6 +479,10 @@ def processEndTag(self, token):
                 func = self.__endTagCache[name]
             except KeyError:
                 func = self.__endTagCache[name] = self.endTagHandler[name]
+                # bound the cache size in case we get loads of unknown tagss
+                while len(self.__endTagCache) > len(self.endTagHandler) * 1.1:
+                    # this makes the eviction policy random on Py < 3.7 and FIFO >= 3.7
+                    self.__endTagCache.pop(next(iter(self.__endTagCache)))
             return func(token)
 
     class InitialPhase(Phase):