119 lines
2.4 KiB
C
119 lines
2.4 KiB
C
/**
|
|
* See Copyright Notice in picrin.h
|
|
*/
|
|
|
|
#include "picrin.h"
|
|
|
|
static pic_value
|
|
var_conv(pic_state *pic, struct pic_proc *var, pic_value val)
|
|
{
|
|
if (pic_proc_env_has(pic, var, "conv") != 0) {
|
|
return pic_apply1(pic, pic_proc_ptr(pic_proc_env_ref(pic, var, "conv")), val);
|
|
}
|
|
return val;
|
|
}
|
|
|
|
static pic_value
|
|
var_get(pic_state *pic, struct pic_proc *var)
|
|
{
|
|
pic_value elem, it;
|
|
pic_sym *id;
|
|
struct pic_dict *dict;
|
|
|
|
id = pic_sym_ptr(pic_proc_env_ref(pic, var, "id"));
|
|
|
|
pic_for_each (elem, pic->ptable, it) {
|
|
dict = pic_dict_ptr(elem);
|
|
if (pic_dict_has(pic, dict, id)) {
|
|
return pic_dict_ref(pic, dict, id);
|
|
}
|
|
}
|
|
pic_panic(pic, "logic flaw");
|
|
}
|
|
|
|
static pic_value
|
|
var_set(pic_state *pic, struct pic_proc *var, pic_value val)
|
|
{
|
|
pic_sym *id;
|
|
struct pic_dict *dict;
|
|
|
|
id = pic_sym_ptr(pic_proc_env_ref(pic, var, "id"));
|
|
|
|
dict = pic_dict_ptr(pic_car(pic, pic->ptable));
|
|
|
|
pic_dict_set(pic, dict, id, val);
|
|
|
|
return pic_none_value();
|
|
}
|
|
|
|
static pic_value
|
|
var_call(pic_state *pic)
|
|
{
|
|
struct pic_proc *self = pic_get_proc(pic);
|
|
pic_value val;
|
|
int n;
|
|
|
|
n = pic_get_args(pic, "|o", &val);
|
|
|
|
if (n == 0) {
|
|
return var_get(pic, self);
|
|
} else {
|
|
return var_set(pic, self, var_conv(pic, self, val));
|
|
}
|
|
}
|
|
|
|
struct pic_proc *
|
|
pic_make_var(pic_state *pic, pic_value init, struct pic_proc *conv)
|
|
{
|
|
struct pic_proc *var;
|
|
pic_value converter = conv ? pic_obj_value(conv) : pic_false_value();
|
|
pic_sym *id;
|
|
|
|
var = pic_make_proc(pic, var_call, "<var-call>");
|
|
|
|
if (conv != NULL) {
|
|
pic_proc_env_set(pic, var, "conv", converter);
|
|
}
|
|
id = pic_intern(pic, pic_format(pic, "%d", pic->pnum++));
|
|
pic_proc_env_set(pic, var, "id", pic_obj_value(id));
|
|
|
|
pic_apply1(pic, var, init);
|
|
|
|
return var;
|
|
}
|
|
|
|
static pic_value
|
|
pic_var_make_parameter(pic_state *pic)
|
|
{
|
|
struct pic_proc *conv = NULL;
|
|
pic_value init;
|
|
|
|
pic_get_args(pic, "o|l", &init, &conv);
|
|
|
|
return pic_obj_value(pic_make_var(pic, init, conv));
|
|
}
|
|
|
|
static pic_value
|
|
pic_var_with_parameter(pic_state *pic)
|
|
{
|
|
struct pic_proc *body;
|
|
pic_value val;
|
|
|
|
pic_get_args(pic, "l", &body);
|
|
|
|
pic->ptable = pic_cons(pic, pic_obj_value(pic_make_dict(pic)), pic->ptable);
|
|
|
|
val = pic_apply0(pic, body);
|
|
|
|
pic->ptable = pic_cdr(pic, pic->ptable);
|
|
|
|
return val;
|
|
}
|
|
|
|
void
|
|
pic_init_var(pic_state *pic)
|
|
{
|
|
pic_defun(pic, "make-parameter", pic_var_make_parameter);
|
|
pic_defun(pic, "with-parameter", pic_var_with_parameter);
|
|
}
|