Introduction - If you have any usage issues, please Google them yourself
In 1.3.1, based on the realization of textbooks algorithm 2.1 (elimination of non-termination symbol), said production is critical, a simple start storage (such as a string), back on the deal with relatively trouble a start processing complex (such as the formation of production classes and objects), followed by relatively easy class has some methods. Such as the stack, it can be a stack stack operation. The simplified result, with 1.3.1 the grammar written text file method, output