+++ /dev/null
-/*
- * 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 int name_size(char *name)
-{
- return sizeof(struct ao_scheme_atom) + strlen(name) + 1;
-}
-
-static int atom_size(void *addr)
-{
- struct ao_scheme_atom *atom = addr;
- if (!atom)
- return 0;
- return name_size(atom->name);
-}
-
-static void atom_mark(void *addr)
-{
- struct ao_scheme_atom *atom = addr;
-
- for (;;) {
- atom = ao_scheme_poly_atom(atom->next);
- if (!atom)
- break;
- if (ao_scheme_mark_memory(&ao_scheme_atom_type, atom))
- break;
- }
-}
-
-static void atom_move(void *addr)
-{
- struct ao_scheme_atom *atom = addr;
- int ret;
-
- for (;;) {
- struct ao_scheme_atom *next = ao_scheme_poly_atom(atom->next);
-
- if (!next)
- break;
- ret = ao_scheme_move_memory(&ao_scheme_atom_type, (void **) &next);
- if (next != ao_scheme_poly_atom(atom->next))
- atom->next = ao_scheme_atom_poly(next);
- if (ret)
- break;
- atom = next;
- }
-}
-
-const struct ao_scheme_type ao_scheme_atom_type = {
- .mark = atom_mark,
- .size = atom_size,
- .move = atom_move,
- .name = "atom"
-};
-
-struct ao_scheme_atom *ao_scheme_atoms;
-
-static struct ao_scheme_atom *
-ao_scheme_atom_find(char *name)
-{
- struct ao_scheme_atom *atom;
-
- for (atom = ao_scheme_atoms; atom; atom = ao_scheme_poly_atom(atom->next)) {
- if (!strcmp(atom->name, name))
- return atom;
- }
-#ifdef ao_builtin_atoms
- for (atom = ao_scheme_poly_atom(ao_builtin_atoms); atom; atom = ao_scheme_poly_atom(atom->next)) {
- if (!strcmp(atom->name, name))
- return atom;
- }
-#endif
- return NULL;
-}
-
-static void
-ao_scheme_atom_init(struct ao_scheme_atom *atom, char *name)
-{
- if (atom) {
- atom->type = AO_SCHEME_ATOM;
- strcpy(atom->name, name);
- atom->next = ao_scheme_atom_poly(ao_scheme_atoms);
- ao_scheme_atoms = atom;
- }
-}
-
-struct ao_scheme_atom *
-ao_scheme_string_to_atom(struct ao_scheme_string *string)
-{
- struct ao_scheme_atom *atom = ao_scheme_atom_find(string->val);
-
- if (atom)
- return atom;
- ao_scheme_string_stash(string);
- atom = ao_scheme_alloc(name_size(string->val));
- string = ao_scheme_string_fetch();
- ao_scheme_atom_init(atom, string->val);
- return atom;
-}
-
-struct ao_scheme_atom *
-ao_scheme_atom_intern(char *name)
-{
- struct ao_scheme_atom *atom = ao_scheme_atom_find(name);
- if (atom)
- return atom;
-
- atom = ao_scheme_alloc(name_size(name));
- ao_scheme_atom_init(atom, name);
- return atom;
-}
-
-ao_poly *
-ao_scheme_atom_ref(ao_poly atom, struct ao_scheme_frame **frame_ref)
-{
- ao_poly *ref;
- struct ao_scheme_frame *frame;
-
- for (frame = ao_scheme_frame_current; frame; frame = ao_scheme_poly_frame(frame->prev)) {
- ref = ao_scheme_frame_ref(frame, atom);
- if (ref) {
- if (frame_ref)
- *frame_ref = frame;
- return ref;
- }
- }
- ref = ao_scheme_frame_ref(ao_scheme_frame_global, atom);
- if (ref)
- if (frame_ref)
- *frame_ref = ao_scheme_frame_global;
- return ref;
-}
-
-ao_poly
-ao_scheme_atom_get(ao_poly atom)
-{
- ao_poly *ref = ao_scheme_atom_ref(atom, NULL);
-
-#ifdef ao_builtin_frame
- if (!ref)
- ref = ao_scheme_frame_ref(ao_scheme_poly_frame(ao_builtin_frame), atom);
-#endif
- if (ref)
- return *ref;
- return ao_scheme_error(AO_SCHEME_UNDEFINED, "undefined atom %s", ao_scheme_poly_atom(atom)->name);
-}
-
-ao_poly
-ao_scheme_atom_set(ao_poly atom, ao_poly val)
-{
- ao_poly *ref = ao_scheme_atom_ref(atom, NULL);
-
- if (!ref)
- return ao_scheme_error(AO_SCHEME_UNDEFINED, "undefined atom %s", ao_scheme_poly_atom(atom)->name);
- *ref = val;
- return val;
-}
-
-ao_poly
-ao_scheme_atom_def(ao_poly atom, ao_poly val)
-{
- struct ao_scheme_frame *frame;
- ao_poly *ref = ao_scheme_atom_ref(atom, &frame);
-
- if (ref) {
- if (frame == ao_scheme_frame_current)
- return ao_scheme_error(AO_SCHEME_REDEFINED, "attempt to redefine atom %s", ao_scheme_poly_atom(atom)->name);
- *ref = val;
- return val;
- }
- return ao_scheme_frame_add(ao_scheme_frame_current ? ao_scheme_frame_current : ao_scheme_frame_global, atom, val);
-}
-
-void
-ao_scheme_atom_write(ao_poly a, bool write)
-{
- struct ao_scheme_atom *atom = ao_scheme_poly_atom(a);
- (void) write;
- printf("%s", atom->name);
-}
projects / fw / altos / blobdiff