mirror of
https://github.com/freebsd/freebsd-src.git
synced 2024-11-28 15:32:45 +00:00
717252ea98
was a valid integer. The actual decision between integer and string is now context-dependant on the operator being used.
546 lines
8.4 KiB
Plaintext
546 lines
8.4 KiB
Plaintext
%{
|
|
/* Written by Pace Willisson (pace@blitz.com)
|
|
* and placed in the public domain.
|
|
*
|
|
* Largely rewritten by J.T. Conklin (jtc@wimsey.com)
|
|
*
|
|
* $Id: expr.y,v 1.10 1995/08/04 17:08:07 joerg Exp $
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <locale.h>
|
|
#include <ctype.h>
|
|
#include <err.h>
|
|
|
|
enum valtype {
|
|
integer, numeric_string, string
|
|
} ;
|
|
|
|
struct val {
|
|
enum valtype type;
|
|
union {
|
|
char *s;
|
|
int i;
|
|
} u;
|
|
} ;
|
|
|
|
struct val *result;
|
|
struct val *op_or ();
|
|
struct val *op_and ();
|
|
struct val *op_eq ();
|
|
struct val *op_gt ();
|
|
struct val *op_lt ();
|
|
struct val *op_ge ();
|
|
struct val *op_le ();
|
|
struct val *op_ne ();
|
|
struct val *op_plus ();
|
|
struct val *op_minus ();
|
|
struct val *op_times ();
|
|
struct val *op_div ();
|
|
struct val *op_rem ();
|
|
struct val *op_colon ();
|
|
|
|
char **av;
|
|
%}
|
|
|
|
%union
|
|
{
|
|
struct val *val;
|
|
}
|
|
|
|
%left <val> '|'
|
|
%left <val> '&'
|
|
%left <val> '=' '>' '<' GE LE NE
|
|
%left <val> '+' '-'
|
|
%left <val> '*' '/' '%'
|
|
%left <val> ':'
|
|
|
|
%token <val> TOKEN
|
|
%type <val> start expr
|
|
|
|
%%
|
|
|
|
start: expr { result = $$; }
|
|
|
|
expr: TOKEN
|
|
| '(' expr ')' { $$ = $2; }
|
|
| expr '|' expr { $$ = op_or ($1, $3); }
|
|
| expr '&' expr { $$ = op_and ($1, $3); }
|
|
| expr '=' expr { $$ = op_eq ($1, $3); }
|
|
| expr '>' expr { $$ = op_gt ($1, $3); }
|
|
| expr '<' expr { $$ = op_lt ($1, $3); }
|
|
| expr GE expr { $$ = op_ge ($1, $3); }
|
|
| expr LE expr { $$ = op_le ($1, $3); }
|
|
| expr NE expr { $$ = op_ne ($1, $3); }
|
|
| expr '+' expr { $$ = op_plus ($1, $3); }
|
|
| expr '-' expr { $$ = op_minus ($1, $3); }
|
|
| expr '*' expr { $$ = op_times ($1, $3); }
|
|
| expr '/' expr { $$ = op_div ($1, $3); }
|
|
| expr '%' expr { $$ = op_rem ($1, $3); }
|
|
| expr ':' expr { $$ = op_colon ($1, $3); }
|
|
;
|
|
|
|
|
|
%%
|
|
|
|
struct val *
|
|
make_integer (i)
|
|
int i;
|
|
{
|
|
struct val *vp;
|
|
|
|
vp = (struct val *) malloc (sizeof (*vp));
|
|
if (vp == NULL) {
|
|
errx (2, "malloc() failed");
|
|
}
|
|
|
|
vp->type = integer;
|
|
vp->u.i = i;
|
|
return vp;
|
|
}
|
|
|
|
struct val *
|
|
make_str (s)
|
|
char *s;
|
|
{
|
|
struct val *vp;
|
|
int i, isint;
|
|
|
|
vp = (struct val *) malloc (sizeof (*vp));
|
|
if (vp == NULL || ((vp->u.s = strdup (s)) == NULL)) {
|
|
errx (2, "malloc() failed");
|
|
}
|
|
|
|
for(i = 1, isint = isdigit(s[0]) || s[0] == '-';
|
|
isint && i < strlen(s);
|
|
i++)
|
|
{
|
|
if(!isdigit(s[i]))
|
|
isint = 0;
|
|
}
|
|
|
|
if (isint)
|
|
vp->type = numeric_string;
|
|
else
|
|
vp->type = string;
|
|
|
|
return vp;
|
|
}
|
|
|
|
|
|
void
|
|
free_value (vp)
|
|
struct val *vp;
|
|
{
|
|
if (vp->type == string || vp->type == numeric_string)
|
|
free (vp->u.s);
|
|
}
|
|
|
|
|
|
int
|
|
to_integer (vp)
|
|
struct val *vp;
|
|
{
|
|
int i;
|
|
|
|
if (vp->type == integer)
|
|
return 1;
|
|
|
|
if (vp->type == string)
|
|
return 0;
|
|
|
|
/* vp->type == numeric_string, make it numeric */
|
|
i = atoi(vp->u.s);
|
|
free (vp->u.s);
|
|
vp->u.i = i;
|
|
vp->type = integer;
|
|
return 1;
|
|
}
|
|
|
|
void
|
|
to_string (vp)
|
|
struct val *vp;
|
|
{
|
|
char *tmp;
|
|
|
|
if (vp->type == string || vp->type == numeric_string)
|
|
return;
|
|
|
|
tmp = malloc (25);
|
|
if (tmp == NULL) {
|
|
errx (2, "malloc() failed");
|
|
}
|
|
|
|
sprintf (tmp, "%d", vp->u.i);
|
|
vp->type = string;
|
|
vp->u.s = tmp;
|
|
}
|
|
|
|
|
|
int
|
|
isstring (vp)
|
|
struct val *vp;
|
|
{
|
|
/* only TRUE if this string is not a valid integer */
|
|
return (vp->type == string);
|
|
}
|
|
|
|
|
|
int
|
|
yylex ()
|
|
{
|
|
char *p;
|
|
|
|
if (*av == NULL)
|
|
return (0);
|
|
|
|
p = *av++;
|
|
|
|
if (strlen (p) == 1) {
|
|
if (strchr ("|&=<>+-*/%:()", *p))
|
|
return (*p);
|
|
} else if (strlen (p) == 2 && p[1] == '=') {
|
|
switch (*p) {
|
|
case '>': return (GE);
|
|
case '<': return (LE);
|
|
case '!': return (NE);
|
|
}
|
|
}
|
|
|
|
yylval.val = make_str (p);
|
|
return (TOKEN);
|
|
}
|
|
|
|
int
|
|
is_zero_or_null (vp)
|
|
struct val *vp;
|
|
{
|
|
if (vp->type == integer) {
|
|
return (vp->u.i == 0);
|
|
} else {
|
|
return (*vp->u.s == 0 || (to_integer (vp) && vp->u.i == 0));
|
|
}
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
int yyparse ();
|
|
|
|
int
|
|
main (argc, argv)
|
|
int argc;
|
|
char **argv;
|
|
{
|
|
setlocale (LC_ALL, "");
|
|
|
|
av = argv + 1;
|
|
|
|
yyparse ();
|
|
|
|
if (result->type == integer)
|
|
printf ("%d\n", result->u.i);
|
|
else
|
|
printf ("%s\n", result->u.s);
|
|
|
|
return (is_zero_or_null (result));
|
|
}
|
|
|
|
int
|
|
yyerror (s)
|
|
char *s;
|
|
{
|
|
errx (2, "syntax error");
|
|
}
|
|
|
|
|
|
struct val *
|
|
op_or (a, b)
|
|
struct val *a, *b;
|
|
{
|
|
if (is_zero_or_null (a)) {
|
|
free_value (a);
|
|
return (b);
|
|
} else {
|
|
free_value (b);
|
|
return (a);
|
|
}
|
|
}
|
|
|
|
struct val *
|
|
op_and (a, b)
|
|
struct val *a, *b;
|
|
{
|
|
if (is_zero_or_null (a) || is_zero_or_null (b)) {
|
|
free_value (a);
|
|
free_value (b);
|
|
return (make_integer (0));
|
|
} else {
|
|
free_value (b);
|
|
return (a);
|
|
}
|
|
}
|
|
|
|
struct val *
|
|
op_eq (a, b)
|
|
struct val *a, *b;
|
|
{
|
|
struct val *r;
|
|
|
|
if (isstring (a) || isstring (b)) {
|
|
to_string (a);
|
|
to_string (b);
|
|
r = make_integer (strcoll (a->u.s, b->u.s) == 0);
|
|
} else {
|
|
(void)to_integer(a);
|
|
(void)to_integer(b);
|
|
r = make_integer (a->u.i == b->u.i);
|
|
}
|
|
|
|
free_value (a);
|
|
free_value (b);
|
|
return r;
|
|
}
|
|
|
|
struct val *
|
|
op_gt (a, b)
|
|
struct val *a, *b;
|
|
{
|
|
struct val *r;
|
|
|
|
if (isstring (a) || isstring (b)) {
|
|
to_string (a);
|
|
to_string (b);
|
|
r = make_integer (strcoll (a->u.s, b->u.s) > 0);
|
|
} else {
|
|
(void)to_integer(a);
|
|
(void)to_integer(b);
|
|
r= make_integer (a->u.i > b->u.i);
|
|
}
|
|
|
|
free_value (a);
|
|
free_value (b);
|
|
return r;
|
|
}
|
|
|
|
struct val *
|
|
op_lt (a, b)
|
|
struct val *a, *b;
|
|
{
|
|
struct val *r;
|
|
|
|
if (isstring (a) || isstring (b)) {
|
|
to_string (a);
|
|
to_string (b);
|
|
r = make_integer (strcoll (a->u.s, b->u.s) < 0);
|
|
} else {
|
|
(void)to_integer(a);
|
|
(void)to_integer(b);
|
|
r = make_integer (a->u.i < b->u.i);
|
|
}
|
|
|
|
free_value (a);
|
|
free_value (b);
|
|
return r;
|
|
}
|
|
|
|
struct val *
|
|
op_ge (a, b)
|
|
struct val *a, *b;
|
|
{
|
|
struct val *r;
|
|
|
|
if (isstring (a) || isstring (b)) {
|
|
to_string (a);
|
|
to_string (b);
|
|
r = make_integer (strcoll (a->u.s, b->u.s) >= 0);
|
|
} else {
|
|
(void)to_integer(a);
|
|
(void)to_integer(b);
|
|
r = make_integer (a->u.i >= b->u.i);
|
|
}
|
|
|
|
free_value (a);
|
|
free_value (b);
|
|
return r;
|
|
}
|
|
|
|
struct val *
|
|
op_le (a, b)
|
|
struct val *a, *b;
|
|
{
|
|
struct val *r;
|
|
|
|
if (isstring (a) || isstring (b)) {
|
|
to_string (a);
|
|
to_string (b);
|
|
r = make_integer (strcoll (a->u.s, b->u.s) <= 0);
|
|
} else {
|
|
(void)to_integer(a);
|
|
(void)to_integer(b);
|
|
r = make_integer (a->u.i <= b->u.i);
|
|
}
|
|
|
|
free_value (a);
|
|
free_value (b);
|
|
return r;
|
|
}
|
|
|
|
struct val *
|
|
op_ne (a, b)
|
|
struct val *a, *b;
|
|
{
|
|
struct val *r;
|
|
|
|
if (isstring (a) || isstring (b)) {
|
|
to_string (a);
|
|
to_string (b);
|
|
r = make_integer (strcoll (a->u.s, b->u.s) != 0);
|
|
} else {
|
|
(void)to_integer(a);
|
|
(void)to_integer(b);
|
|
r = make_integer (a->u.i != b->u.i);
|
|
}
|
|
|
|
free_value (a);
|
|
free_value (b);
|
|
return r;
|
|
}
|
|
|
|
struct val *
|
|
op_plus (a, b)
|
|
struct val *a, *b;
|
|
{
|
|
struct val *r;
|
|
|
|
if (!to_integer (a) || !to_integer (b)) {
|
|
errx (2, "non-numeric argument");
|
|
}
|
|
|
|
r = make_integer (a->u.i + b->u.i);
|
|
free_value (a);
|
|
free_value (b);
|
|
return r;
|
|
}
|
|
|
|
struct val *
|
|
op_minus (a, b)
|
|
struct val *a, *b;
|
|
{
|
|
struct val *r;
|
|
|
|
if (!to_integer (a) || !to_integer (b)) {
|
|
errx (2, "non-numeric argument");
|
|
}
|
|
|
|
r = make_integer (a->u.i - b->u.i);
|
|
free_value (a);
|
|
free_value (b);
|
|
return r;
|
|
}
|
|
|
|
struct val *
|
|
op_times (a, b)
|
|
struct val *a, *b;
|
|
{
|
|
struct val *r;
|
|
|
|
if (!to_integer (a) || !to_integer (b)) {
|
|
errx (2, "non-numeric argument");
|
|
}
|
|
|
|
r = make_integer (a->u.i * b->u.i);
|
|
free_value (a);
|
|
free_value (b);
|
|
return (r);
|
|
}
|
|
|
|
struct val *
|
|
op_div (a, b)
|
|
struct val *a, *b;
|
|
{
|
|
struct val *r;
|
|
|
|
if (!to_integer (a) || !to_integer (b)) {
|
|
errx (2, "non-numeric argument");
|
|
}
|
|
|
|
if (b->u.i == 0) {
|
|
errx (2, "division by zero");
|
|
}
|
|
|
|
r = make_integer (a->u.i / b->u.i);
|
|
free_value (a);
|
|
free_value (b);
|
|
return r;
|
|
}
|
|
|
|
struct val *
|
|
op_rem (a, b)
|
|
struct val *a, *b;
|
|
{
|
|
struct val *r;
|
|
|
|
if (!to_integer (a) || !to_integer (b)) {
|
|
errx (2, "non-numeric argument");
|
|
}
|
|
|
|
if (b->u.i == 0) {
|
|
errx (2, "division by zero");
|
|
}
|
|
|
|
r = make_integer (a->u.i % b->u.i);
|
|
free_value (a);
|
|
free_value (b);
|
|
return r;
|
|
}
|
|
|
|
#include <sys/types.h>
|
|
#include <regex.h>
|
|
|
|
struct val *
|
|
op_colon (a, b)
|
|
struct val *a, *b;
|
|
{
|
|
regex_t rp;
|
|
regmatch_t rm[2];
|
|
char errbuf[256];
|
|
int eval;
|
|
struct val *v;
|
|
|
|
/* coerce to both arguments to strings */
|
|
to_string(a);
|
|
to_string(b);
|
|
|
|
/* compile regular expression */
|
|
if ((eval = regcomp (&rp, b->u.s, 0)) != 0) {
|
|
regerror (eval, &rp, errbuf, sizeof(errbuf));
|
|
errx (2, "%s", errbuf);
|
|
}
|
|
|
|
/* compare string against pattern */
|
|
/* remember that patterns are anchored to the beginning of the line */
|
|
if (regexec(&rp, a->u.s, 2, rm, 0) == 0 && rm[0].rm_so == 0) {
|
|
if (rm[1].rm_so >= 0) {
|
|
*(a->u.s + rm[1].rm_eo) = '\0';
|
|
v = make_str (a->u.s + rm[1].rm_so);
|
|
|
|
} else {
|
|
v = make_integer (rm[0].rm_eo - rm[0].rm_so);
|
|
}
|
|
} else {
|
|
if (rp.re_nsub == 0) {
|
|
v = make_integer (0);
|
|
} else {
|
|
v = make_str ("");
|
|
}
|
|
}
|
|
|
|
/* free arguments and pattern buffer */
|
|
free_value (a);
|
|
free_value (b);
|
|
regfree (&rp);
|
|
|
|
return v;
|
|
}
|