picrin/extlib/benz/bool.c

211 lines
4.0 KiB
C

/**
* See Copyright Notice in picrin.h
*/
#include "picrin.h"
static bool
str_equal_p(pic_state *pic, struct pic_string *str1, struct pic_string *str2)
{
return pic_str_cmp(pic, str1, str2) == 0;
}
static bool
blob_equal_p(struct pic_blob *blob1, struct pic_blob *blob2)
{
size_t i;
if (blob1->len != blob2->len) {
return false;
}
for (i = 0; i < blob1->len; ++i) {
if (blob1->data[i] != blob2->data[i])
return false;
}
return true;
}
static bool
internal_equal_p(pic_state *pic, pic_value x, pic_value y, size_t depth, xhash *xh, bool xh_initted_p)
{
pic_value local = pic_nil_value();
size_t c;
if (depth > 10) {
if (depth > 200) {
pic_errorf(pic, "Stack overflow in equal\n");
}
if (pic_pair_p(x) || pic_vec_p(x)) {
if (! xh_initted_p) {
xh_init_ptr(xh, 0);
xh_initted_p = true;
}
if (xh_get_ptr(xh, pic_obj_ptr(x)) != NULL) {
return true; /* `x' was seen already. */
} else {
xh_put_ptr(xh, pic_obj_ptr(x), NULL);
}
}
}
c = 0;
LOOP:
if (pic_eqv_p(x, y))
return true;
if (pic_type(x) != pic_type(y))
return false;
switch (pic_type(x)) {
case PIC_TT_STRING:
return str_equal_p(pic, pic_str_ptr(x), pic_str_ptr(y));
case PIC_TT_BLOB:
return blob_equal_p(pic_blob_ptr(x), pic_blob_ptr(y));
case PIC_TT_PAIR: {
if (pic_nil_p(local)) {
local = x;
}
if (internal_equal_p(pic, pic_car(pic, x), pic_car(pic, y), depth + 1, xh, xh_initted_p)) {
x = pic_cdr(pic, x);
y = pic_cdr(pic, y);
c++;
if (c == 2) {
c = 0;
local = pic_cdr(pic, local);
if (pic_eq_p(local, x)) {
return true;
}
}
goto LOOP;
} else {
return false;
}
}
case PIC_TT_VECTOR: {
size_t i;
struct pic_vector *u, *v;
u = pic_vec_ptr(x);
v = pic_vec_ptr(y);
if (u->len != v->len) {
return false;
}
for (i = 0; i < u->len; ++i) {
if (! internal_equal_p(pic, u->data[i], v->data[i], depth + 1, xh, xh_initted_p))
return false;
}
return true;
}
case PIC_TT_ID: {
struct pic_id *id1, *id2;
id1 = pic_id_ptr(x);
id2 = pic_id_ptr(y);
return pic_resolve(pic, id1->var, id1->env) == pic_resolve(pic, id2->var, id2->env);
}
default:
return false;
}
}
bool
pic_equal_p(pic_state *pic, pic_value x, pic_value y)
{
xhash ht;
return internal_equal_p(pic, x, y, 0, &ht, false);
}
static pic_value
pic_bool_eq_p(pic_state *pic)
{
pic_value x, y;
pic_get_args(pic, "oo", &x, &y);
return pic_bool_value(pic_eq_p(x, y));
}
static pic_value
pic_bool_eqv_p(pic_state *pic)
{
pic_value x, y;
pic_get_args(pic, "oo", &x, &y);
return pic_bool_value(pic_eqv_p(x, y));
}
static pic_value
pic_bool_equal_p(pic_state *pic)
{
pic_value x, y;
pic_get_args(pic, "oo", &x, &y);
return pic_bool_value(pic_equal_p(pic, x, y));
}
static pic_value
pic_bool_not(pic_state *pic)
{
pic_value v;
pic_get_args(pic, "o", &v);
return pic_false_p(v) ? pic_true_value() : pic_false_value();
}
static pic_value
pic_bool_boolean_p(pic_state *pic)
{
pic_value v;
pic_get_args(pic, "o", &v);
return (pic_true_p(v) || pic_false_p(v)) ? pic_true_value() : pic_false_value();
}
static pic_value
pic_bool_boolean_eq_p(pic_state *pic)
{
size_t argc, i;
pic_value *argv;
pic_get_args(pic, "*", &argc, &argv);
for (i = 0; i < argc; ++i) {
if (! (pic_true_p(argv[i]) || pic_false_p(argv[i]))) {
return pic_false_value();
}
if (! pic_eq_p(argv[i], argv[0])) {
return pic_false_value();
}
}
return pic_true_value();
}
void
pic_init_bool(pic_state *pic)
{
void pic_defun_vm(pic_state *, const char *, pic_sym *, pic_func_t);
pic_defun(pic, "eq?", pic_bool_eq_p);
pic_defun(pic, "eqv?", pic_bool_eqv_p);
pic_defun(pic, "equal?", pic_bool_equal_p);
pic_defun_vm(pic, "not", pic->uNOT, pic_bool_not);
pic_defun(pic, "boolean?", pic_bool_boolean_p);
pic_defun(pic, "boolean=?", pic_bool_boolean_eq_p);
}