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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;
for (;;) {
atom = ao_lisp_poly_atom(atom->next);
if (!atom)
break;
if (ao_lisp_mark_memory(&ao_lisp_atom_type, atom))
break;
}
}
static void atom_move(void *addr)
{
struct ao_lisp_atom *atom = addr;
int ret;
for (;;) {
struct ao_lisp_atom *next = ao_lisp_poly_atom(atom->next);
if (!next)
break;
ret = ao_lisp_move_memory(&ao_lisp_atom_type, (void **) &next);
if (next != ao_lisp_poly_atom(atom->next))
atom->next = ao_lisp_atom_poly(next);
if (ret)
break;
atom = next;
}
}
const struct ao_lisp_type ao_lisp_atom_type = {
.mark = atom_mark,
.size = atom_size,
.move = atom_move,
.name = "atom"
};
struct ao_lisp_atom *ao_lisp_atoms;
struct ao_lisp_atom *
ao_lisp_atom_intern(char *name)
{
struct ao_lisp_atom *atom;
for (atom = ao_lisp_atoms; atom; atom = ao_lisp_poly_atom(atom->next)) {
if (!strcmp(atom->name, name))
return atom;
}
#ifdef ao_builtin_atoms
for (atom = ao_lisp_poly_atom(ao_builtin_atoms); atom; atom = ao_lisp_poly_atom(atom->next)) {
if (!strcmp(atom->name, name))
return atom;
}
#endif
ao_lisp_string_stash(0, name);
atom = ao_lisp_alloc(name_size(name));
name = ao_lisp_string_fetch(0);
if (atom) {
atom->type = AO_LISP_ATOM;
atom->next = ao_lisp_atom_poly(ao_lisp_atoms);
ao_lisp_atoms = atom;
strcpy(atom->name, name);
}
return atom;
}
ao_poly *
ao_lisp_atom_ref(ao_poly atom)
{
ao_poly *ref;
struct ao_lisp_frame *frame;
for (frame = ao_lisp_frame_current; frame; frame = ao_lisp_poly_frame(frame->prev)) {
ref = ao_lisp_frame_ref(frame, atom);
if (ref)
return ref;
}
return ao_lisp_frame_ref(ao_lisp_frame_global, atom);
}
ao_poly
ao_lisp_atom_get(ao_poly atom)
{
ao_poly *ref = ao_lisp_atom_ref(atom);
#ifdef ao_builtin_frame
if (!ref)
ref = ao_lisp_frame_ref(ao_lisp_poly_frame(ao_builtin_frame), atom);
#endif
if (ref)
return *ref;
return ao_lisp_error(AO_LISP_UNDEFINED, "undefined atom %s", ao_lisp_poly_atom(atom)->name);
}
ao_poly
ao_lisp_atom_set(ao_poly atom, ao_poly val)
{
ao_poly *ref = ao_lisp_atom_ref(atom);
if (!ref)
return ao_lisp_error(AO_LISP_UNDEFINED, "undefined atom %s", ao_lisp_poly_atom(atom)->name);
*ref = val;
return val;
}
ao_poly
ao_lisp_atom_def(ao_poly atom, ao_poly val)
{
ao_poly *ref = ao_lisp_atom_ref(atom);
if (ref) {
if (ao_lisp_frame_current)
return ao_lisp_error(AO_LISP_REDEFINED, "attempt to redefine atom %s", ao_lisp_poly_atom(atom)->name);
*ref = val;
return val;
}
return ao_lisp_frame_add(ao_lisp_frame_current ? ao_lisp_frame_current : ao_lisp_frame_global, atom, val);
}
void
ao_lisp_atom_write(ao_poly a)
{
struct ao_lisp_atom *atom = ao_lisp_poly_atom(a);
printf("%s", atom->name);
}
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