state.py 文件源码

def match(self, pattern):
        """
        Return the match obtained by searching @pattern.

        The current `position` will advance as many characters as the match's
        length.

        @pattern
          A regular expression.
        """
        m = re.compile(pattern).match(self.source, self.position)
        if m:
            self.position += m.end() - m.start()

            return m

        return