Tiny语法分析器（递归下降分析法实现）

递归规约规则是这样的

program→stmt-sequence

stmt-sequence→stmt-sequence;statement|statement

statement→if-stmt|repate-stmt|assign-stmt|read-stmt|write-stmt|var-stmt

var-stmt→var identifier-assign-name := type

identifier-assign-name→name

if-stmt→if exp then stmt-sequence ;

            |if exp then stmt-sequence else stmt-sequence ;

reapet-stmt→repeat stmt-sequence until exp

assign-stmt→identifier := exp

read-stmt→read indetifier

write-stmt→write exp

exp→simple-exp comparison simple-exp |simple-exp

comparison→<|=

simple-exp→simple-exp addop term | term

addop→+|-

term→term mulop factor | factor

mulop → *|/

factor→ (exp)|number | identifier

因为源码分了好几个文件，不太好贴出来了，所以决定上传到Github上，

项目地址：https://github.com/INnoVationes/TinyCompiler

文件内容：ExplLexicalAnalyzer  ：词法分析器

ExplParsing ：语法分析器

GLOBALS： 一些全局变量，包括语法树结构等

Util：打印语法树，处理变量等内容