X-Git-Url: https://git.gag.com/?a=blobdiff_plain;f=src%2Fscheme%2Fao_scheme_cons.c;fp=src%2Fscheme%2Fao_scheme_cons.c;h=03dad956d6561f59e31f4e79bc3004def0c3e2a9;hb=195cbeec19a6a44f309a9040d727d37fe4e2ec97;hp=0000000000000000000000000000000000000000;hpb=9dbc686ad7d3289dc0f9bcf4a973f71100e02ded;p=fw%2Faltos

diff --git a/src/scheme/ao_scheme_cons.c b/src/scheme/ao_scheme_cons.c
new file mode 100644
index 00000000..03dad956
--- /dev/null
+++ b/src/scheme/ao_scheme_cons.c
@@ -0,0 +1,201 @@
+/*
+ * 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, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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.
+ */
+
+#include "ao_scheme.h"
+
+static void cons_mark(void *addr)
+{
+	struct ao_scheme_cons	*cons = addr;
+
+	for (;;) {
+		ao_poly cdr = cons->cdr;
+
+		ao_scheme_poly_mark(cons->car, 1);
+		if (!cdr)
+			break;
+		if (ao_scheme_poly_type(cdr) != AO_SCHEME_CONS) {
+			ao_scheme_poly_mark(cdr, 1);
+			break;
+		}
+		cons = ao_scheme_poly_cons(cdr);
+		if (ao_scheme_mark_memory(&ao_scheme_cons_type, cons))
+			break;
+	}
+}
+
+static int cons_size(void *addr)
+{
+	(void) addr;
+	return sizeof (struct ao_scheme_cons);
+}
+
+static void cons_move(void *addr)
+{
+	struct ao_scheme_cons	*cons = addr;
+
+	if (!cons)
+		return;
+
+	for (;;) {
+		ao_poly			cdr;
+		struct ao_scheme_cons	*c;
+		int	ret;
+
+		MDBG_MOVE("cons_move start %d (%d, %d)\n",
+			  MDBG_OFFSET(cons), MDBG_OFFSET(ao_scheme_ref(cons->car)), MDBG_OFFSET(ao_scheme_ref(cons->cdr)));
+		(void) ao_scheme_poly_move(&cons->car, 1);
+		cdr = cons->cdr;
+		if (!cdr)
+			break;
+		if (ao_scheme_poly_base_type(cdr) != AO_SCHEME_CONS) {
+			(void) ao_scheme_poly_move(&cons->cdr, 0);
+			break;
+		}
+		c = ao_scheme_poly_cons(cdr);
+		ret = ao_scheme_move_memory(&ao_scheme_cons_type, (void **) &c);
+		if (c != ao_scheme_poly_cons(cons->cdr))
+			cons->cdr = ao_scheme_cons_poly(c);
+		MDBG_MOVE("cons_move end %d (%d, %d)\n",
+			  MDBG_OFFSET(cons), MDBG_OFFSET(ao_scheme_ref(cons->car)), MDBG_OFFSET(ao_scheme_ref(cons->cdr)));
+		if (ret)
+			break;
+		cons = c;
+	}
+}
+
+const struct ao_scheme_type ao_scheme_cons_type = {
+	.mark = cons_mark,
+	.size = cons_size,
+	.move = cons_move,
+	.name = "cons",
+};
+
+struct ao_scheme_cons *ao_scheme_cons_free_list;
+
+struct ao_scheme_cons *
+ao_scheme_cons_cons(ao_poly car, ao_poly cdr)
+{
+	struct ao_scheme_cons	*cons;
+
+	if (ao_scheme_cons_free_list) {
+		cons = ao_scheme_cons_free_list;
+		ao_scheme_cons_free_list = ao_scheme_poly_cons(cons->cdr);
+	} else {
+		ao_scheme_poly_stash(0, car);
+		ao_scheme_poly_stash(1, cdr);
+		cons = ao_scheme_alloc(sizeof (struct ao_scheme_cons));
+		cdr = ao_scheme_poly_fetch(1);
+		car = ao_scheme_poly_fetch(0);
+		if (!cons)
+			return NULL;
+	}
+	cons->car = car;
+	cons->cdr = cdr;
+	return cons;
+}
+
+struct ao_scheme_cons *
+ao_scheme_cons_cdr(struct ao_scheme_cons *cons)
+{
+	ao_poly	cdr = cons->cdr;
+	if (cdr == AO_SCHEME_NIL)
+		return NULL;
+	if (ao_scheme_poly_type(cdr) != AO_SCHEME_CONS) {
+		(void) ao_scheme_error(AO_SCHEME_INVALID, "improper list");
+		return NULL;
+	}
+	return ao_scheme_poly_cons(cdr);
+}
+
+ao_poly
+ao_scheme__cons(ao_poly car, ao_poly cdr)
+{
+	return ao_scheme_cons_poly(ao_scheme_cons_cons(car, cdr));
+}
+
+void
+ao_scheme_cons_free(struct ao_scheme_cons *cons)
+{
+#if DBG_FREE_CONS
+	ao_scheme_cons_check(cons);
+#endif
+	while (cons) {
+		ao_poly cdr = cons->cdr;
+		cons->cdr = ao_scheme_cons_poly(ao_scheme_cons_free_list);
+		ao_scheme_cons_free_list = cons;
+		cons = ao_scheme_poly_cons(cdr);
+	}
+}
+
+void
+ao_scheme_cons_write(ao_poly c)
+{
+	struct ao_scheme_cons	*cons = ao_scheme_poly_cons(c);
+	ao_poly			cdr;
+	int			first = 1;
+
+	printf("(");
+	while (cons) {
+		if (!first)
+			printf(" ");
+		ao_scheme_poly_write(cons->car);
+		cdr = cons->cdr;
+		if (cdr == c) {
+			printf(" ...");
+			break;
+		}
+		if (ao_scheme_poly_type(cdr) == AO_SCHEME_CONS) {
+			cons = ao_scheme_poly_cons(cdr);
+			first = 0;
+		} else {
+			printf(" . ");
+			ao_scheme_poly_write(cdr);
+			cons = NULL;
+		}
+	}
+	printf(")");
+}
+
+void
+ao_scheme_cons_display(ao_poly c)
+{
+	struct ao_scheme_cons	*cons = ao_scheme_poly_cons(c);
+	ao_poly			cdr;
+
+	while (cons) {
+		ao_scheme_poly_display(cons->car);
+		cdr = cons->cdr;
+		if (cdr == c) {
+			printf("...");
+			break;
+		}
+		if (ao_scheme_poly_type(cdr) == AO_SCHEME_CONS)
+			cons = ao_scheme_poly_cons(cdr);
+		else {
+			ao_scheme_poly_display(cdr);
+			cons = NULL;
+		}
+	}
+}
+
+int
+ao_scheme_cons_length(struct ao_scheme_cons *cons)
+{
+	int	len = 0;
+	while (cons) {
+		len++;
+		cons = ao_scheme_poly_cons(cons->cdr);
+	}
+	return len;
+}