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/*
* Copyright © 2016 Keith Packard <keithp@keithp.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
#include "ao_scheme.h"
static void string_mark(void *addr)
{
(void) addr;
}
static int string_size(void *addr)
{
struct ao_scheme_string *string = addr;
if (!addr)
return 0;
return strlen(string->val) + 2;
}
static void string_move(void *addr)
{
(void) addr;
}
const struct ao_scheme_type ao_scheme_string_type = {
.mark = string_mark,
.size = string_size,
.move = string_move,
.name = "string",
};
static struct ao_scheme_string *
ao_scheme_string_alloc(int len)
{
struct ao_scheme_string *s;
s = ao_scheme_alloc(len + 2);
if (!s)
return NULL;
s->type = AO_SCHEME_STRING;
return s;
}
struct ao_scheme_string *
ao_scheme_string_copy(struct ao_scheme_string *a)
{
int alen = strlen(a->val);
struct ao_scheme_string *r;
ao_scheme_string_stash(0, a);
r = ao_scheme_string_alloc(alen);
a = ao_scheme_string_fetch(0);
if (!r)
return NULL;
strcpy(r->val, a->val);
return r;
}
struct ao_scheme_string *
ao_scheme_string_make(char *a)
{
struct ao_scheme_string *r;
r = ao_scheme_string_alloc(strlen(a));
if (!r)
return NULL;
strcpy(r->val, a);
return r;
}
struct ao_scheme_string *
ao_scheme_atom_to_string(struct ao_scheme_atom *a)
{
int alen = strlen(a->name);
struct ao_scheme_string *r;
ao_scheme_poly_stash(0, ao_scheme_atom_poly(a));
r = ao_scheme_string_alloc(alen);
a = ao_scheme_poly_atom(ao_scheme_poly_fetch(0));
if (!r)
return NULL;
strcpy(r->val, a->name);
return r;
}
struct ao_scheme_string *
ao_scheme_string_cat(struct ao_scheme_string *a, struct ao_scheme_string *b)
{
int alen = strlen(a->val);
int blen = strlen(b->val);
struct ao_scheme_string *r;
ao_scheme_string_stash(0, a);
ao_scheme_string_stash(1, b);
r = ao_scheme_string_alloc(alen + blen);
a = ao_scheme_string_fetch(0);
b = ao_scheme_string_fetch(1);
if (!r)
return NULL;
strcpy(r->val, a->val);
strcpy(r->val+alen, b->val);
return r;
}
ao_poly
ao_scheme_string_pack(struct ao_scheme_cons *cons)
{
struct ao_scheme_string *r;
char *rval;
int len;
len = ao_scheme_cons_length(cons);
ao_scheme_cons_stash(0, cons);
r = ao_scheme_string_alloc(len);
cons = ao_scheme_cons_fetch(0);
if (!r)
return AO_SCHEME_NIL;
rval = r->val;
while (cons) {
bool fail = false;
ao_poly car = cons->car;
*rval++ = ao_scheme_poly_integer(car, &fail);
if (fail)
return ao_scheme_error(AO_SCHEME_INVALID, "non-int passed to pack");
cons = ao_scheme_cons_cdr(cons);
}
*rval++ = 0;
return ao_scheme_string_poly(r);
}
ao_poly
ao_scheme_string_unpack(struct ao_scheme_string *a)
{
struct ao_scheme_cons *cons = NULL, *tail = NULL;
int c;
int i;
for (i = 0; (c = a->val[i]); i++) {
struct ao_scheme_cons *n;
ao_scheme_cons_stash(0, cons);
ao_scheme_cons_stash(1, tail);
ao_scheme_string_stash(0, a);
n = ao_scheme_cons_cons(ao_scheme_int_poly(c), AO_SCHEME_NIL);
a = ao_scheme_string_fetch(0);
cons = ao_scheme_cons_fetch(0);
tail = ao_scheme_cons_fetch(1);
if (!n) {
cons = NULL;
break;
}
if (tail)
tail->cdr = ao_scheme_cons_poly(n);
else
cons = n;
tail = n;
}
return ao_scheme_cons_poly(cons);
}
void
ao_scheme_string_write(ao_poly p, bool write)
{
struct ao_scheme_string *s = ao_scheme_poly_string(p);
char *sval = s->val;
char c;
if (write) {
putchar('"');
while ((c = *sval++)) {
switch (c) {
case '\n':
printf ("\\n");
break;
case '\r':
printf ("\\r");
break;
case '\t':
printf ("\\t");
break;
default:
if (c < ' ')
printf("\\%03o", c);
else
putchar(c);
break;
}
}
putchar('"');
} else {
while ((c = *sval++))
putchar(c);
}
}
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