File: rp.y

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golang-github-blynn-nex 0.0.0%2Bgit.2021.03.30.1a3320dab9-3
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%{
package main
%}

%union {
  n int
}

%token NUM
%%
input:    /* empty */
       | input line
;

line:     '\n'
       | exp '\n'      { println($1.n); }
;

exp:     NUM           { $$.n = $1.n;        }
       | exp exp '+'   { $$.n = $1.n + $2.n; }
       | exp exp '-'   { $$.n = $1.n - $2.n; }
       | exp exp '*'   { $$.n = $1.n * $2.n; }
       | exp exp '/'   { $$.n = $1.n / $2.n; }
	/* Unary minus    */
       | exp 'n'       { $$.n = -$1.n;       }
;
%%