/**************************************************************************/
/*                                                                        */
/*  Menhir                                                                */
/*                                                                        */
/*  François Pottier, INRIA Rocquencourt                                  */
/*  Yann Régis-Gianas, PPS, Université Paris Diderot                      */
/*                                                                        */
/*  Copyright 2005-2008 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.                                            */
/*                                                                        */
/**************************************************************************/

(* This partial grammar specification defines the syntax of expressions
   in algebraic notation. *)

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

%%

%public 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 }