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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_lisp.h"
static int name_size(char *name)
{
return sizeof(struct ao_lisp_atom) + strlen(name) + 1;
}
static int atom_size(void *addr)
{
struct ao_lisp_atom *atom = addr;
if (!atom)
return 0;
return name_size(atom->name);
}
static void atom_mark(void *addr)
{
struct ao_lisp_atom *atom = addr;
if (atom->next == AO_LISP_ATOM_CONST)
return;
for (;;) {
ao_lisp_poly_mark(atom->val);
atom = atom->next;
if (!atom)
break;
if (ao_lisp_mark_memory(atom, atom_size(atom)))
break;
}
}
static void atom_move(void *addr)
{
struct ao_lisp_atom *atom = addr;
if (atom->next == AO_LISP_ATOM_CONST)
return;
for (;;) {
struct ao_lisp_atom *next;
atom->val = ao_lisp_poly_move(atom->val);
next = ao_lisp_move_memory(atom->next, atom_size(atom->next));
if (!next)
break;
atom->next = next;
atom = next;
}
}
const struct ao_lisp_mem_type ao_lisp_atom_type = {
.mark = atom_mark,
.size = atom_size,
.move = atom_move,
};
struct ao_lisp_atom *atoms;
struct ao_lisp_atom *
ao_lisp_atom_intern(char *name)
{
struct ao_lisp_atom *atom;
int b;
for (atom = atoms; atom; atom = atom->next) {
if (!strcmp(atom->name, name))
return atom;
}
for (b = 0; ao_lisp_builtins[b]; b++)
if (!strcmp(ao_lisp_builtins[b]->name, name))
return (struct ao_lisp_atom *) ao_lisp_builtins[b];
if (!atoms)
ao_lisp_root_add(&ao_lisp_atom_type, (void **) &atoms);
atom = ao_lisp_alloc(name_size(name));
if (atom) {
atom->type = AO_LISP_ATOM;
atom->next = atoms;
atoms = atom;
strcpy(atom->name, name);
atom->val = AO_LISP_NIL;
}
return atom;
}
void
ao_lisp_atom_print(struct ao_lisp_atom *a)
{
fputs(a->name, stdout);
}
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