test.txt

编译原理中的First集与 Follow集生成程序

%token ID NUM
%%
line:
    expr ';' line
   |
  ;
expr:
    expr '+' term
  | expr '-' term
  | term
  |
  ;
term:
    term '*' factor
  | term '/' factor
  | factor
  ;
factor:
    ID
  | NUM
  | '(' expr ')'
  ;