def __init__(self, encoding="UTF-8"):
self.categories = {}
self._encoding = encoding
self._state = self._STATE_OutsideAiml
self._version = ""
self._namespace = ""
self._forwardCompatibleMode = False
self._currentPattern = ""
self._currentThat = ""
self._currentTopic = ""
self._insideTopic = False
self._currentUnknown = "" # the name of the current unknown element
# This is set to true when a parse error occurs in a category.
self._skipCurrentCategory = False
# Counts the number of parse errors in a particular AIML document.
# query with getNumErrors(). If 0, the document is AIML-compliant.
self._numParseErrors = 0
# TODO: select the proper validInfo table based on the version number.
self._validInfo = self._validationInfo101
# This stack of bools is used when parsing <li> elements inside
# <condition> elements, to keep track of whether or not an
# attribute-less "default" <li> element has been found yet. Only
# one default <li> is allowed in each <condition> element. We need
# a stack in order to correctly handle nested <condition> tags.
self._foundDefaultLiStack = []
# This stack of strings indicates what the current whitespace-handling
# behavior should be. Each string in the stack is either "default" or
# "preserve". When a new AIML element is encountered, a new string is
# pushed onto the stack, based on the value of the element's "xml:space"
# attribute (if absent, the top of the stack is pushed again). When
# ending an element, pop an object off the stack.
self._whitespaceBehaviorStack = ["default"]
self._elemStack = []
self._locator = Locator()
self.setDocumentLocator(self._locator)
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