语法分析是编译过程的核心部分。他的任务是在词法分析识别单词符号串的基础上，分析并判断程序的的语法结构是否符合语法规则。语言的语法结构是用上下文无关文法描述的。因此语法分析器的工作的本质上就是按文法的产生式，识别输入符号串是否为一个句子。对于一个文法，当给你一串符号是，如何知道它是不是该文法的一个句子，这是这个课程设计所要解决的一个问题。-Syntax analysis is the core of the compiler process. His task is to identify the word in the lexical analysis of strings of symbols based on the analysis and procedures to determine whether or not the grammatical structure of the grammar rules. Grammatical structure of language is described in context-free grammar. Thus the work of the parser is essentially based on generative grammar to identify whether the input symbol string a sentence. For a grammar, a string of symbols, when you is how to know that it is not the grammar of a sentence, which is the design of this course to solve a problem.