return _ao_scheme_bool_true;
}
-ao_poly
-ao_scheme_arg(struct ao_scheme_cons *cons, int argc)
+static ao_poly
+ao_scheme_opt_arg(struct ao_scheme_cons *cons, int argc, ao_poly def)
{
- if (!cons)
- return AO_SCHEME_NIL;
- while (argc--) {
+ for (;;) {
if (!cons)
- return AO_SCHEME_NIL;
+ return def;
+ if (argc == 0)
+ return cons->car;
cons = ao_scheme_cons_cdr(cons);
+ argc--;
}
- return cons->car;
+}
+
+ao_poly
+ao_scheme_arg(struct ao_scheme_cons *cons, int argc)
+{
+ return ao_scheme_opt_arg(cons, argc, AO_SCHEME_NIL);
}
ao_poly
return i;
}
+static int32_t
+ao_scheme_opt_arg_int(ao_poly name, struct ao_scheme_cons *cons, int argc, int def)
+{
+ ao_poly p = ao_scheme_opt_arg(cons, argc, ao_scheme_int_poly(def));
+ bool fail = false;
+ int32_t i = ao_scheme_poly_integer(p, &fail);
+
+ if (fail)
+ (void) ao_scheme_error(AO_SCHEME_INVALID, "%v: arg %d invalid type %v", name, argc, p);
+ return i;
+}
+
ao_poly
ao_scheme_do_car(struct ao_scheme_cons *cons)
{
ao_poly
ao_scheme_do_vector_to_list(struct ao_scheme_cons *cons)
{
- if (!ao_scheme_check_argc(_ao_scheme_atom_vector2d3elist, cons, 1, 1))
+ int start, end;
+
+ if (!ao_scheme_check_argc(_ao_scheme_atom_vector2d3elist, cons, 1, 3))
return AO_SCHEME_NIL;
if (!ao_scheme_check_argt(_ao_scheme_atom_vector2d3elist, cons, 0, AO_SCHEME_VECTOR, 0))
return AO_SCHEME_NIL;
- return ao_scheme_cons_poly(ao_scheme_vector_to_list(ao_scheme_poly_vector(ao_scheme_arg(cons, 0))));
+ start = ao_scheme_opt_arg_int(_ao_scheme_atom_vector2d3elist, cons, 1, ao_scheme_int_poly(0));
+ if (ao_scheme_exception)
+ return AO_SCHEME_NIL;
+ end = ao_scheme_opt_arg_int(_ao_scheme_atom_vector2d3elist, cons, 2, ao_scheme_int_poly(-1));
+ if (ao_scheme_exception)
+ return AO_SCHEME_NIL;
+ return ao_scheme_cons_poly(ao_scheme_vector_to_list(ao_scheme_poly_vector(ao_scheme_arg(cons, 0)),
+ start,
+ end));
}
ao_poly
}
struct ao_scheme_cons *
-ao_scheme_vector_to_list(struct ao_scheme_vector *vector)
+ao_scheme_vector_to_list(struct ao_scheme_vector *vector, int start, int end)
{
- unsigned int i;
+ int i;
uint16_t length = vector->length;
struct ao_scheme_cons *cons = NULL;
- for (i = length; i-- > 0;) {
+ if (end == -1)
+ end = length;
+ if (start < 0)
+ start = 0;
+ if (end > length)
+ end = length;
+ for (i = end; i-- > start;) {
ao_scheme_vector_stash(vector);
cons = ao_scheme_cons_cons(vector->vals[i], ao_scheme_cons_poly(cons));
vector = ao_scheme_vector_fetch();