668 lines
12 KiB
C
668 lines
12 KiB
C
/**
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* See Copyright Notice in picrin.h
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*/
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#include "picrin.h"
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#include "object.h"
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pic_value
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pic_cons(pic_state *pic, pic_value car, pic_value cdr)
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{
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struct pair *pair;
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pair = (struct pair *)pic_obj_alloc(pic, sizeof(struct pair), PIC_TYPE_PAIR);
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pair->car = car;
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pair->cdr = cdr;
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return obj_value(pic, pair);
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}
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pic_value
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pic_car(pic_state *pic, pic_value obj)
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{
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if (! pic_pair_p(pic, obj)) {
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pic_error(pic, "car: pair required", 1, obj);
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}
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return pic_pair_ptr(pic, obj)->car;
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}
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pic_value
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pic_cdr(pic_state *pic, pic_value obj)
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{
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if (! pic_pair_p(pic, obj)) {
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pic_error(pic, "cdr: pair required", 1, obj);
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}
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return pic_pair_ptr(pic, obj)->cdr;
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}
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void
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pic_set_car(pic_state *pic, pic_value obj, pic_value val)
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{
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if (! pic_pair_p(pic, obj)) {
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pic_error(pic, "pair required", 0);
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}
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pic_pair_ptr(pic, obj)->car = val;
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}
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void
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pic_set_cdr(pic_state *pic, pic_value obj, pic_value val)
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{
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if (! pic_pair_p(pic, obj)) {
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pic_error(pic, "pair required", 0);
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}
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pic_pair_ptr(pic, obj)->cdr = val;
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}
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pic_value
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pic_caar(pic_state *pic, pic_value v)
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{
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return pic_car(pic, pic_car(pic, v));
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}
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pic_value
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pic_cadr(pic_state *pic, pic_value v)
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{
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return pic_car(pic, pic_cdr(pic, v));
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}
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pic_value
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pic_cdar(pic_state *pic, pic_value v)
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{
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return pic_cdr(pic, pic_car(pic, v));
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}
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pic_value
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pic_cddr(pic_state *pic, pic_value v)
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{
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return pic_cdr(pic, pic_cdr(pic, v));
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}
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bool
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pic_list_p(pic_state *pic, pic_value obj)
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{
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pic_value local, rapid;
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int i;
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/* Floyd's cycle-finding algorithm. */
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local = rapid = obj;
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while (true) {
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/* advance rapid fast-forward; runs 2x faster than local */
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for (i = 0; i < 2; ++i) {
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if (pic_pair_p(pic, rapid)) {
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rapid = pic_pair_ptr(pic, rapid)->cdr;
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}
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else {
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return pic_nil_p(pic, rapid);
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}
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}
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/* advance local */
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local = pic_pair_ptr(pic, local)->cdr;
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if (pic_eq_p(pic, local, rapid)) {
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return false;
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}
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}
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}
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pic_value
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pic_make_list(pic_state *pic, int n, pic_value *argv)
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{
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pic_value list;
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int i;
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list = pic_nil_value(pic);
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for (i = n - 1; i >= 0; --i) {
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list = pic_cons(pic, argv[i], list);
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}
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return list;
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}
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pic_value
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pic_list(pic_state *pic, int n, ...)
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{
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va_list ap;
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pic_value list;
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va_start(ap, n);
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list = pic_vlist(pic, n, ap);
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va_end(ap);
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return list;
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}
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pic_value
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pic_vlist(pic_state *pic, int n, va_list ap)
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{
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pic_value *argv = pic_alloca(pic, sizeof(pic_value) * n);
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int i;
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for (i = 0; i < n; ++i) {
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argv[i] = va_arg(ap, pic_value);
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}
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return pic_make_list(pic, n, argv);
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}
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pic_value
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pic_list_ref(pic_state *pic, pic_value list, int i)
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{
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return pic_car(pic, pic_list_tail(pic, list, i));
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}
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void
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pic_list_set(pic_state *pic, pic_value list, int i, pic_value obj)
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{
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pic_pair_ptr(pic, pic_list_tail(pic, list, i))->car = obj;
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}
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pic_value
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pic_list_tail(pic_state *pic, pic_value list, int i)
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{
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while (i-- > 0) {
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list = pic_cdr(pic, list);
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}
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return list;
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}
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int
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pic_length(pic_state *pic, pic_value obj)
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{
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int c = 0;
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while (! pic_nil_p(pic, obj)) {
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obj = pic_cdr(pic, obj);
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++c;
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}
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return c;
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}
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pic_value
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pic_reverse(pic_state *pic, pic_value list)
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{
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size_t ai = pic_enter(pic);
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pic_value v, acc, it;
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acc = pic_nil_value(pic);
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pic_for_each(v, list, it) {
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acc = pic_cons(pic, v, acc);
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pic_leave(pic, ai);
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pic_protect(pic, acc);
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}
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return acc;
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}
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pic_value
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pic_append(pic_state *pic, pic_value xs, pic_value ys)
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{
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size_t ai = pic_enter(pic);
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pic_value x, it;
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xs = pic_reverse(pic, xs);
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pic_for_each (x, xs, it) {
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ys = pic_cons(pic, x, ys);
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pic_leave(pic, ai);
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pic_protect(pic, xs);
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pic_protect(pic, ys);
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}
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return ys;
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}
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static pic_value
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pic_pair_pair_p(pic_state *pic)
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{
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pic_value v;
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pic_get_args(pic, "o", &v);
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return pic_bool_value(pic, pic_pair_p(pic, v));
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}
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static pic_value
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pic_pair_cons(pic_state *pic)
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{
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pic_value v,w;
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pic_get_args(pic, "oo", &v, &w);
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return pic_cons(pic, v, w);
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}
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static pic_value
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pic_pair_car(pic_state *pic)
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{
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pic_value v;
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pic_get_args(pic, "o", &v);
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return pic_car(pic, v);
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}
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static pic_value
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pic_pair_cdr(pic_state *pic)
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{
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pic_value v;
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pic_get_args(pic, "o", &v);
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return pic_cdr(pic, v);
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}
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static pic_value
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pic_pair_caar(pic_state *pic)
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{
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pic_value v;
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pic_get_args(pic, "o", &v);
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return pic_caar(pic, v);
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}
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static pic_value
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pic_pair_cadr(pic_state *pic)
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{
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pic_value v;
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pic_get_args(pic, "o", &v);
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return pic_cadr(pic, v);
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}
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static pic_value
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pic_pair_cdar(pic_state *pic)
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{
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pic_value v;
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pic_get_args(pic, "o", &v);
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return pic_cdar(pic, v);
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}
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static pic_value
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pic_pair_cddr(pic_state *pic)
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{
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pic_value v;
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pic_get_args(pic, "o", &v);
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return pic_cddr(pic, v);
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}
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static pic_value
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pic_pair_set_car(pic_state *pic)
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{
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pic_value v,w;
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pic_get_args(pic, "oo", &v, &w);
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pic_set_car(pic, v, w);
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return pic_undef_value(pic);
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}
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static pic_value
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pic_pair_set_cdr(pic_state *pic)
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{
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pic_value v,w;
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pic_get_args(pic, "oo", &v, &w);
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pic_set_cdr(pic, v, w);
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return pic_undef_value(pic);
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}
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static pic_value
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pic_pair_null_p(pic_state *pic)
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{
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pic_value v;
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pic_get_args(pic, "o", &v);
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return pic_bool_value(pic, pic_nil_p(pic, v));
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}
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static pic_value
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pic_pair_list_p(pic_state *pic)
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{
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pic_value v;
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pic_get_args(pic, "o", &v);
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return pic_bool_value(pic, pic_list_p(pic, v));
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}
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static pic_value
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pic_pair_make_list(pic_state *pic)
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{
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int k, i;
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pic_value list, fill = pic_undef_value(pic);
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pic_get_args(pic, "i|o", &k, &fill);
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list = pic_nil_value(pic);
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for (i = 0; i < k; ++i) {
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list = pic_cons(pic, fill, list);
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}
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return list;
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}
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static pic_value
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pic_pair_list(pic_state *pic)
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{
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int argc;
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pic_value *argv;
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pic_get_args(pic, "*", &argc, &argv);
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return pic_make_list(pic, argc, argv);
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}
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static pic_value
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pic_pair_length(pic_state *pic)
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{
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pic_value list;
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pic_get_args(pic, "o", &list);
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return pic_int_value(pic, pic_length(pic, list));
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}
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static pic_value
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pic_pair_append(pic_state *pic)
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{
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int argc;
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pic_value *args, list;
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pic_get_args(pic, "*", &argc, &args);
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if (argc == 0) {
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return pic_nil_value(pic);
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}
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list = args[--argc];
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while (argc-- > 0) {
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list = pic_append(pic, args[argc], list);
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}
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return list;
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}
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static pic_value
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pic_pair_reverse(pic_state *pic)
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{
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pic_value list;
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pic_get_args(pic, "o", &list);
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return pic_reverse(pic, list);
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}
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static pic_value
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pic_pair_list_tail(pic_state *pic)
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{
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pic_value list;
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int i;
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pic_get_args(pic, "oi", &list, &i);
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return pic_list_tail(pic, list, i);
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}
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static pic_value
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pic_pair_list_ref(pic_state *pic)
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{
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pic_value list;
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int i;
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pic_get_args(pic, "oi", &list, &i);
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return pic_list_ref(pic, list, i);
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}
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static pic_value
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pic_pair_list_set(pic_state *pic)
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{
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pic_value list, obj;
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int i;
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pic_get_args(pic, "oio", &list, &i, &obj);
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pic_list_set(pic, list, i, obj);
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return pic_undef_value(pic);
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}
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static pic_value
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pic_pair_list_copy(pic_state *pic)
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{
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pic_value list, head, tail, tmp;
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pic_get_args(pic, "o", &list);
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head = tail = pic_nil_value(pic);
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while (pic_pair_p(pic, list)) {
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tmp = pic_list(pic, 1, pic_car(pic, list));
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if (! pic_nil_p(pic, tail)) {
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pic_set_cdr(pic, tail, tmp);
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}
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tail = tmp;
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if (pic_nil_p(pic, head)) {
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head = tail;
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}
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list = pic_cdr(pic, list);
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}
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if (pic_nil_p(pic, tail)) {
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return list;
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}
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pic_set_cdr(pic, tail, list);
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return head;
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}
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static pic_value
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pic_pair_map(pic_state *pic)
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{
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int argc, i;
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pic_value proc, *args, *arg_list, ret;
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pic_get_args(pic, "l*", &proc, &argc, &args);
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if (argc == 0)
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pic_error(pic, "map: wrong number of arguments (1 for at least 2)", 0);
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arg_list = pic_alloca(pic, sizeof(pic_value) * argc);
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ret = pic_nil_value(pic);
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do {
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for (i = 0; i < argc; ++i) {
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if (! pic_pair_p(pic, args[i])) {
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break;
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}
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arg_list[i] = pic_car(pic, args[i]);
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args[i] = pic_cdr(pic, args[i]);
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}
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if (i != argc) {
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break;
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}
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pic_push(pic, pic_apply(pic, proc, i, arg_list), ret);
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} while (1);
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return pic_reverse(pic, ret);
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}
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static pic_value
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pic_pair_for_each(pic_state *pic)
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{
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int argc, i;
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pic_value proc, *args, *arg_list;
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pic_get_args(pic, "l*", &proc, &argc, &args);
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arg_list = pic_alloca(pic, sizeof(pic_value) * argc);
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do {
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for (i = 0; i < argc; ++i) {
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if (! pic_pair_p(pic, args[i])) {
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break;
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}
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arg_list[i] = pic_car(pic, args[i]);
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args[i] = pic_cdr(pic, args[i]);
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}
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if (i != argc) {
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break;
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}
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pic_apply(pic, proc, i, arg_list);
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} while (1);
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return pic_undef_value(pic);
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}
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static pic_value
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pic_pair_memq(pic_state *pic)
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{
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pic_value key, list;
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pic_get_args(pic, "oo", &key, &list);
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while (! pic_nil_p(pic, list)) {
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if (pic_eq_p(pic, key, pic_car(pic, list))) {
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return list;
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}
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list = pic_cdr(pic, list);
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}
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return pic_false_value(pic);
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}
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static pic_value
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pic_pair_memv(pic_state *pic)
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{
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pic_value key, list;
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pic_get_args(pic, "oo", &key, &list);
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while (! pic_nil_p(pic, list)) {
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if (pic_eqv_p(pic, key, pic_car(pic, list))) {
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return list;
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}
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list = pic_cdr(pic, list);
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}
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return pic_false_value(pic);
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}
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static pic_value
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pic_pair_member(pic_state *pic)
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{
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pic_value key, list, proc;
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int n;
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n = pic_get_args(pic, "oo|l", &key, &list, &proc);
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while (! pic_nil_p(pic, list)) {
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if (n == 2) {
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if (pic_equal_p(pic, key, pic_car(pic, list)))
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return list;
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} else {
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if (! pic_false_p(pic, pic_call(pic, proc, 2, key, pic_car(pic, list))))
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return list;
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}
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list = pic_cdr(pic, list);
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}
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return pic_false_value(pic);
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}
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static pic_value
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pic_pair_assq(pic_state *pic)
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{
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pic_value key, alist, cell;
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pic_get_args(pic, "oo", &key, &alist);
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while (! pic_nil_p(pic, alist)) {
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cell = pic_car(pic, alist);
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if (pic_eq_p(pic, key, pic_car(pic, cell))) {
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return cell;
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}
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alist = pic_cdr(pic, alist);
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}
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return pic_false_value(pic);
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}
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static pic_value
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pic_pair_assv(pic_state *pic)
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{
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pic_value key, alist, cell;
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pic_get_args(pic, "oo", &key, &alist);
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|
|
while (! pic_nil_p(pic, alist)) {
|
|
cell = pic_car(pic, alist);
|
|
if (pic_eqv_p(pic, key, pic_car(pic, cell))) {
|
|
return cell;
|
|
}
|
|
alist = pic_cdr(pic, alist);
|
|
}
|
|
return pic_false_value(pic);
|
|
}
|
|
|
|
static pic_value
|
|
pic_pair_assoc(pic_state *pic)
|
|
{
|
|
pic_value key, alist, proc, cell;
|
|
int n;
|
|
|
|
n = pic_get_args(pic, "oo|l", &key, &alist, &proc);
|
|
|
|
while (! pic_nil_p(pic, alist)) {
|
|
cell = pic_car(pic, alist);
|
|
if (n == 2) {
|
|
if (pic_equal_p(pic, key, pic_car(pic, cell)))
|
|
return cell;
|
|
} else {
|
|
if (! pic_false_p(pic, pic_call(pic, proc, 2, key, pic_car(pic, cell))))
|
|
return cell;
|
|
}
|
|
alist = pic_cdr(pic, alist);
|
|
}
|
|
return pic_false_value(pic);
|
|
}
|
|
|
|
void
|
|
pic_init_pair(pic_state *pic)
|
|
{
|
|
pic_defun(pic, "pair?", pic_pair_pair_p);
|
|
pic_defun(pic, "cons", pic_pair_cons);
|
|
pic_defun(pic, "car", pic_pair_car);
|
|
pic_defun(pic, "cdr", pic_pair_cdr);
|
|
pic_defun(pic, "null?", pic_pair_null_p);
|
|
|
|
pic_defun(pic, "set-car!", pic_pair_set_car);
|
|
pic_defun(pic, "set-cdr!", pic_pair_set_cdr);
|
|
|
|
pic_defun(pic, "caar", pic_pair_caar);
|
|
pic_defun(pic, "cadr", pic_pair_cadr);
|
|
pic_defun(pic, "cdar", pic_pair_cdar);
|
|
pic_defun(pic, "cddr", pic_pair_cddr);
|
|
pic_defun(pic, "list?", pic_pair_list_p);
|
|
pic_defun(pic, "make-list", pic_pair_make_list);
|
|
pic_defun(pic, "list", pic_pair_list);
|
|
pic_defun(pic, "length", pic_pair_length);
|
|
pic_defun(pic, "append", pic_pair_append);
|
|
pic_defun(pic, "reverse", pic_pair_reverse);
|
|
pic_defun(pic, "list-tail", pic_pair_list_tail);
|
|
pic_defun(pic, "list-ref", pic_pair_list_ref);
|
|
pic_defun(pic, "list-set!", pic_pair_list_set);
|
|
pic_defun(pic, "list-copy", pic_pair_list_copy);
|
|
pic_defun(pic, "map", pic_pair_map);
|
|
pic_defun(pic, "for-each", pic_pair_for_each);
|
|
pic_defun(pic, "memq", pic_pair_memq);
|
|
pic_defun(pic, "memv", pic_pair_memv);
|
|
pic_defun(pic, "member", pic_pair_member);
|
|
pic_defun(pic, "assq", pic_pair_assq);
|
|
pic_defun(pic, "assv", pic_pair_assv);
|
|
pic_defun(pic, "assoc", pic_pair_assoc);
|
|
}
|