2 * Copyright © 2016 Keith Packard <keithp@keithp.com>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; version 2 of the License.
8 * This program is distributed in the hope that it will be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
13 * You should have received a copy of the GNU General Public License along
14 * with this program; if not, write to the Free Software Foundation, Inc.,
15 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
20 static int name_size(char *name)
22 return sizeof(struct ao_lisp_atom) + strlen(name) + 1;
25 static int atom_size(void *addr)
27 struct ao_lisp_atom *atom = addr;
30 return name_size(atom->name);
33 static void atom_mark(void *addr)
35 struct ao_lisp_atom *atom = addr;
38 atom = ao_lisp_poly_atom(atom->next);
41 if (ao_lisp_mark_memory(atom, atom_size(atom)))
46 static void atom_move(void *addr)
48 struct ao_lisp_atom *atom = addr;
51 if (ao_lisp_poly_move(&atom->next, 0))
53 atom = ao_lisp_poly_atom(atom->next);
57 const struct ao_lisp_type ao_lisp_atom_type = {
63 struct ao_lisp_atom *ao_lisp_atoms;
66 ao_lisp_atom_intern(char *name)
68 struct ao_lisp_atom *atom;
70 for (atom = ao_lisp_atoms; atom; atom = ao_lisp_poly_atom(atom->next)) {
71 if (!strcmp(atom->name, name))
74 #ifdef ao_builtin_atoms
75 for (atom = ao_lisp_poly_atom(ao_builtin_atoms); atom; atom = ao_lisp_poly_atom(atom->next)) {
76 if (!strcmp(atom->name, name))
80 atom = ao_lisp_alloc(name_size(name));
82 atom->type = AO_LISP_ATOM;
83 atom->next = ao_lisp_atom_poly(ao_lisp_atoms);
85 ao_lisp_root_add(&ao_lisp_atom_type, &ao_lisp_atoms);
87 strcpy(atom->name, name);
92 struct ao_lisp_frame *ao_lisp_frame_global;
93 struct ao_lisp_frame *ao_lisp_frame_current;
96 ao_lisp_atom_init(void)
98 if (!ao_lisp_frame_global) {
99 ao_lisp_frame_global = ao_lisp_frame_new(0);
100 ao_lisp_root_add(&ao_lisp_frame_type, &ao_lisp_frame_global);
101 ao_lisp_root_add(&ao_lisp_frame_type, &ao_lisp_frame_current);
106 ao_lisp_atom_ref(struct ao_lisp_frame *frame, ao_poly atom)
111 ref = ao_lisp_frame_ref(frame, atom);
114 frame = ao_lisp_poly_frame(frame->next);
116 if (ao_lisp_frame_global) {
117 ref = ao_lisp_frame_ref(ao_lisp_frame_global, atom);
125 ao_lisp_atom_get(ao_poly atom)
127 ao_poly *ref = ao_lisp_atom_ref(ao_lisp_frame_current, atom);
129 if (!ref && ao_lisp_frame_global)
130 ref = ao_lisp_frame_ref(ao_lisp_frame_global, atom);
131 #ifdef ao_builtin_frame
133 ref = ao_lisp_frame_ref(ao_lisp_poly_frame(ao_builtin_frame), atom);
137 return ao_lisp_error(AO_LISP_UNDEFINED, "undefined atom %s", ao_lisp_poly_atom(atom)->name);
141 ao_lisp_atom_set(ao_poly atom, ao_poly val)
143 ao_poly *ref = ao_lisp_atom_ref(ao_lisp_frame_current, atom);
145 if (!ref && ao_lisp_frame_global)
146 ref = ao_lisp_frame_ref(ao_lisp_frame_global, atom);
150 ao_lisp_frame_global = ao_lisp_frame_add(ao_lisp_frame_global, atom, val);
155 ao_lisp_atom_print(ao_poly a)
157 struct ao_lisp_atom *atom = ao_lisp_poly_atom(a);
158 printf("%s", atom->name);