picrin/var.c

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/**
* See Copyright Notice in picrin.h
*/
#include "picrin.h"
#include "picrin/var.h"
#include "picrin/pair.h"
struct pic_var *
pic_var_new(pic_state *pic, pic_value init, struct pic_proc *conv)
{
struct pic_var *var;
var = (struct pic_var *)pic_obj_alloc(pic, sizeof(struct pic_var), PIC_TT_VAR);
var->stack = pic_nil_value();
var->conv = conv;
pic_var_push(pic, var, init);
return var;
}
pic_value
pic_var_ref(pic_state *pic, struct pic_var *var)
{
return pic_car(pic, var->stack);
}
void
pic_var_set(pic_state *pic, struct pic_var *var, pic_value value)
{
if (var->conv != NULL) {
value = pic_apply1(pic, var->conv, value);
}
pic_set_car(pic, var->stack, value);
}
void
pic_var_push(pic_state *pic, struct pic_var *var, pic_value value)
{
if (var->conv != NULL) {
value = pic_apply1(pic, var->conv, value);
}
var->stack = pic_cons(pic, value, var->stack);
}
void
pic_var_pop(pic_state *pic, struct pic_var *var)
{
var->stack = pic_cdr(pic, var->stack);
}
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_var_new(pic, init, conv));
}
static pic_value
pic_var_parameter_ref(pic_state *pic)
{
struct pic_var *var;
pic_value v;
pic_get_args(pic, "o", &v);
pic_assert_type(pic, v, var);
var = pic_var_ptr(v);
return pic_var_ref(pic, var);
}
static pic_value
pic_var_parameter_set(pic_state *pic)
{
struct pic_var *var;
pic_value v, val;
pic_get_args(pic, "oo", &v, &val);
pic_assert_type(pic, v, var);
var = pic_var_ptr(v);
pic_var_set(pic, var, val);
return pic_none_value();
}
static pic_value
pic_var_parameter_push(pic_state *pic)
{
struct pic_var *var;
pic_value v, val;
pic_get_args(pic, "oo", &v, &val);
pic_assert_type(pic, v, var);
var = pic_var_ptr(v);
pic_var_push(pic, var, val);
return pic_none_value();
}
static pic_value
pic_var_parameter_pop(pic_state *pic)
{
struct pic_var *var;
pic_value v;
pic_get_args(pic, "o", &v);
pic_assert_type(pic, v, var);
var = pic_var_ptr(v);
pic_var_pop(pic, var);
return pic_none_value();
}
void
pic_init_var(pic_state *pic)
{
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pic_defun(pic, "make-parameter", pic_var_make_parameter);
pic_defun(pic, "parameter-ref", pic_var_parameter_ref);
pic_defun(pic, "parameter-set!", pic_var_parameter_set);
pic_defun(pic, "parameter-push!", pic_var_parameter_push);
pic_defun(pic, "parameter-pop!", pic_var_parameter_pop);
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}