PatternMgr.py 文件源码

def match(self, pattern, that, topic):
        """Return the template which is the closest match to pattern. The
        'that' parameter contains the bot's previous response. The 'topic'
        parameter contains the current topic of conversation.

        Returns None if no template is found.

        """
        if len(pattern) == 0:
            return None
        # Mutilate the input.  Remove all punctuation and convert the
        # text to all caps.
        input = string.upper(pattern)
        input = re.sub(self._puncStripRE, " ", input)
        if that.strip() == u"": that = u"ULTRABOGUSDUMMYTHAT"  # 'that' must never be empty
        thatInput = string.upper(that)
        thatInput = re.sub(self._puncStripRE, " ", thatInput)
        thatInput = re.sub(self._whitespaceRE, " ", thatInput)
        if topic.strip() == u"": topic = u"ULTRABOGUSDUMMYTOPIC"  # 'topic' must never be empty
        topicInput = string.upper(topic)
        topicInput = re.sub(self._puncStripRE, " ", topicInput)

        # Pass the input off to the recursive call
        patMatch, template = self._match(input.split(), thatInput.split(), topicInput.split(), self._root)
        return template