altos/scheme: Rename to 'scheme', clean up build

[fw/altos] / src / scheme / ao_scheme_atom.c

diff --git a/src/scheme/ao_scheme_atom.c b/src/scheme/ao_scheme_atom.c
new file mode 100644 (file)
index 0000000..cb32b7f
--- /dev/null
+++ b/src/scheme/ao_scheme_atom.c
@@ -0,0 +1,167 @@
+/*
+ * 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;
+
+struct ao_scheme_atom *
+ao_scheme_atom_intern(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
+       ao_scheme_string_stash(0, name);
+       atom = ao_scheme_alloc(name_size(name));
+       name = ao_scheme_string_fetch(0);
+       if (atom) {
+               atom->type = AO_SCHEME_ATOM;
+               atom->next = ao_scheme_atom_poly(ao_scheme_atoms);
+               ao_scheme_atoms = atom;
+               strcpy(atom->name, 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)
+{
+       struct ao_scheme_atom *atom = ao_scheme_poly_atom(a);
+       printf("%s", atom->name);
+}