遞歸規約規則是這樣的
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
因為源碼分了好幾個文件，不太好貼出來了，所以決定上傳到Github上，
項目地址：https://github.com/INnoVationes/TinyCompiler
文件內容：ExplLexicalAnalyzer ：詞法分析器
ExplParsing ：語法分析器
GLOBALS： 一些全局變量，包括語法樹結構等
Util：打印語法樹，處理變量等內容