/**************************************************************************/
/*                                                                        */
/*  Menhir                                                                */
/*                                                                        */
/*  François Pottier and Yann Régis-Gianas, INRIA Rocquencourt            */
/*                                                                        */
/*  Copyright 2005 Institut National de Recherche en Informatique et      */
/*  en Automatique. All rights reserved. This file is distributed         */
/*  under the terms of the Q Public License version 1.0, with the         */
/*  change described in file LICENSE.                                     */
/*                                                                        */
/**************************************************************************/

%token <int> INT
%token PLUS MINUS TIMES DIV
%token LPAREN RPAREN
%token EOL

%left PLUS MINUS        /* lowest precedence */
%left TIMES DIV         /* medium precedence */
%nonassoc UMINUS        /* highest precedence */

%start <int> main

%%

main:
| e = expr EOL
    { e }

expr:
| i = INT
    { i }
| LPAREN e = expr RPAREN
    { e }
| e1 = expr PLUS e2 = expr
    { e1 + e2 }
| e1 = expr MINUS e2 = expr
    { e1 - e2 }
| e1 = expr TIMES e2 = expr
    { e1 * e2 }
| e1 = expr DIV e2 = expr
    { e1 / e2 }
| MINUS e = expr %prec UMINUS
    { - e }