/* SPDX-License-Identifier: MIT */
%name Calc
%token PLUS.
%token MINUS.
%token TIMES.
%token INTEGER.
%first_token 257
%left PLUS MINUS.
%left TIMES.
%start_symbol program
program ::= expr.
expr(A) ::= expr(B) PLUS  expr(C). { A = B + C; }
expr(A) ::= expr(B) MINUS expr(C). { A = B - C; }
expr(A) ::= expr(B) TIMES expr(C). { A = B * C; }
expr(A) ::= INTEGER(B). { A = B; }