state_transition_diagram.py 文件源码

def lexical_analysis(self, src):
        string = pp.Regex('[a-zA-Z0-9_{}"=+\-*/\.:;&%@$#<>? ?-??-??-???-???????-?]+')

        blank = pp.LineStart() + pp.LineEnd()

        start = '['
        end = ']' + pp.LineEnd()

        graph_tag = pp.LineStart() + '@'
        graph = graph_tag + start + string + end

        view_tag = pp.LineStart() + '#'
        view = view_tag + start + string + end

        server_process_tag = pp.LineStart() + '$'
        server_process = server_process_tag + start + string + end

        client_process_tag = pp.LineStart() + '%'
        client_process = client_process_tag + start + string + end

        view_transition_identifier = pp.LineStart() + '-->'
        view_transition = view_transition_identifier + string

        process_transition_identifier = pp.LineStart() + '==>'
        process_transition = process_transition_identifier + string

        state_machine = pp.OneOrMore(graph | view | server_process | client_process | view_transition | process_transition | string | blank)

        return state_machine.parseString(src)