CODE EXAMPLE FOR PYTHON

patterns and matcher nfa python code

class Binary(Regex):
    def __init__(self, left, right, empty):
        Regex.__init__(self, empty)
        self.left = left
        self.right = right

    def reset(self):
        self.left.reset()
        self.right.reset()
        Regex.reset(self)

class Alternative(Binary):
    def __init__(self, left, right):
        empty = left.empty or right.empty
        Binary.__init__(self, left, right, empty)

    def _shift(self, c, mark):
        marked_left  = self.left.shift(c, mark)
        marked_right = self.right.shift(c, mark)
        return marked_left or marked_right