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87 lines
2.2 KiB
Plaintext
87 lines
2.2 KiB
Plaintext
%{
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/* $OpenBSD: parser.y,v 1.7 2012/04/12 17:00:11 espie Exp $ */
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/*
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* Copyright (c) 2004 Marc Espie <espie@cvs.openbsd.org>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* $FreeBSD$
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*/
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#include <math.h>
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#include <stdint.h>
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#define YYSTYPE int32_t
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extern int32_t end_result;
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extern int yylex(void);
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extern int yyerror(const char *);
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%}
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%token NUMBER
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%token ERROR
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%left LOR
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%left LAND
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%left '|'
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%left '^'
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%left '&'
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%left EQ NE
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%left '<' LE '>' GE
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%left LSHIFT RSHIFT
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%left '+' '-'
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%left '*' '/' '%'
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%right EXPONENT
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%right UMINUS UPLUS '!' '~'
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%%
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top : expr { end_result = $1; }
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;
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expr : expr '+' expr { $$ = $1 + $3; }
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| expr '-' expr { $$ = $1 - $3; }
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| expr EXPONENT expr { $$ = pow($1, $3); }
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| expr '*' expr { $$ = $1 * $3; }
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| expr '/' expr {
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if ($3 == 0) {
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yyerror("division by zero");
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exit(1);
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}
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$$ = $1 / $3;
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}
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| expr '%' expr {
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if ($3 == 0) {
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yyerror("modulo zero");
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exit(1);
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}
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$$ = $1 % $3;
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}
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| expr LSHIFT expr { $$ = $1 << $3; }
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| expr RSHIFT expr { $$ = $1 >> $3; }
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| expr '<' expr { $$ = $1 < $3; }
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| expr '>' expr { $$ = $1 > $3; }
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| expr LE expr { $$ = $1 <= $3; }
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| expr GE expr { $$ = $1 >= $3; }
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| expr EQ expr { $$ = $1 == $3; }
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| expr NE expr { $$ = $1 != $3; }
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| expr '&' expr { $$ = $1 & $3; }
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| expr '^' expr { $$ = $1 ^ $3; }
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| expr '|' expr { $$ = $1 | $3; }
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| expr LAND expr { $$ = $1 && $3; }
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| expr LOR expr { $$ = $1 || $3; }
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| '(' expr ')' { $$ = $2; }
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| '-' expr %prec UMINUS { $$ = -$2; }
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| '+' expr %prec UPLUS { $$ = $2; }
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| '!' expr { $$ = !$2; }
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| '~' expr { $$ = ~$2; }
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| NUMBER
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;
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%%
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