from pyparsing import *


class Lexer:
    def __init__(self, program):
        star = Regex("\*").setResultsName('star')
        oper_left = Regex("\(").setResultsName('oper_left')
        oper_right = Regex("\)").setResultsName('oper_right')
        text = Regex("\"[a-z*(+)]+\"").setResultsName('text')
        identify = Regex("[A-Z]'|[A-Z]").setResultsName('ident')

        lexems = OneOrMore(Group(identify) | Group(oper_left) | Group(oper_right) | Group(text) | Group(star)).parseString(program)

        self.lexems = [lexem.items().pop() for lexem in lexems]

    def next_token(self): return self.lexems.pop()

    def get_lexems(self): return self.lexems