编译中的LL(1)分析方法的实现。对于输入的文法，判断其有效性，用LL(1)方法进行语法分析，并可判别输入的符号串是否为该文法的句型。 -compiler of LL (1) Method of analysis. The importation of the grammar, to judge its effectiveness, with LL (1) methods for syntax analysis, discriminant can input strings of symbols to whether the grammar driven.