87 lines
2.3 KiB
Plaintext
87 lines
2.3 KiB
Plaintext
%{
|
|
/* $OpenBSD: parser.y,v 1.6 2008/08/21 21:00:14 espie Exp $ */
|
|
/*
|
|
* Copyright (c) 2004 Marc Espie <espie@cvs.openbsd.org>
|
|
*
|
|
* Permission to use, copy, modify, and distribute this software for any
|
|
* purpose with or without fee is hereby granted, provided that the above
|
|
* copyright notice and this permission notice appear in all copies.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
|
|
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
|
|
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
|
|
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
|
|
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
|
|
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
|
|
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
#include <stdint.h>
|
|
#include <math.h>
|
|
#define YYSTYPE int32_t
|
|
extern int32_t end_result;
|
|
extern int yylex(void);
|
|
extern int yyerror(const char *);
|
|
extern int yyparse(void);
|
|
%}
|
|
%token NUMBER
|
|
%token ERROR
|
|
%left LOR
|
|
%left LAND
|
|
%left '|'
|
|
%left '^'
|
|
%left '&'
|
|
%left EQ NE
|
|
%left '<' LE '>' GE
|
|
%left LSHIFT RSHIFT
|
|
%right EXPONENT
|
|
%left '+' '-'
|
|
%left '*' '/' '%'
|
|
%right UMINUS UPLUS '!' '~'
|
|
|
|
%%
|
|
|
|
top : expr { end_result = $1; }
|
|
;
|
|
expr : expr '+' expr { $$ = $1 + $3; }
|
|
| expr '-' expr { $$ = $1 - $3; }
|
|
| expr EXPONENT expr { $$ = pow($1, $3); }
|
|
| expr '*' expr { $$ = $1 * $3; }
|
|
| expr '/' expr {
|
|
if ($3 == 0) {
|
|
yyerror("division by zero");
|
|
exit(1);
|
|
}
|
|
$$ = $1 / $3;
|
|
}
|
|
| expr '%' expr {
|
|
if ($3 == 0) {
|
|
yyerror("modulo zero");
|
|
exit(1);
|
|
}
|
|
$$ = $1 % $3;
|
|
}
|
|
| expr LSHIFT expr { $$ = $1 << $3; }
|
|
| expr RSHIFT expr { $$ = $1 >> $3; }
|
|
| expr '<' expr { $$ = $1 < $3; }
|
|
| expr '>' expr { $$ = $1 > $3; }
|
|
| expr LE expr { $$ = $1 <= $3; }
|
|
| expr GE expr { $$ = $1 >= $3; }
|
|
| expr EQ expr { $$ = $1 == $3; }
|
|
| expr NE expr { $$ = $1 != $3; }
|
|
| expr '&' expr { $$ = $1 & $3; }
|
|
| expr '^' expr { $$ = $1 ^ $3; }
|
|
| expr '|' expr { $$ = $1 | $3; }
|
|
| expr LAND expr { $$ = $1 && $3; }
|
|
| expr LOR expr { $$ = $1 || $3; }
|
|
| '(' expr ')' { $$ = $2; }
|
|
| '-' expr %prec UMINUS { $$ = -$2; }
|
|
| '+' expr %prec UPLUS { $$ = $2; }
|
|
| '!' expr { $$ = !$2; }
|
|
| '~' expr { $$ = ~$2; }
|
|
| NUMBER
|
|
;
|
|
%%
|
|
|