picrin/src/var.c

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/**
* See Copyright Notice in picrin.h
*/
#include "picrin.h"
#include "picrin/proc.h"
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#include "picrin/var.h"
struct pic_var *
pic_var_new(pic_state *pic, pic_value init, struct pic_proc *conv /* = NULL */)
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{
struct pic_var *var;
var = (struct pic_var *)pic_obj_alloc(pic, sizeof(struct pic_var), PIC_TT_VAR);
var->value = pic_undef_value();
var->conv = conv;
pic_var_set(pic, var, init);
return var;
}
pic_value
pic_var_ref(pic_state *pic, struct pic_var *var)
{
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UNUSED(pic);
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return var->value;
}
void
pic_var_set(pic_state *pic, struct pic_var *var, pic_value value)
{
if (var->conv) {
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value = pic_apply1(pic, var->conv, value);
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}
pic_var_set_force(pic, var, value);
}
void
pic_var_set_force(pic_state *pic, struct pic_var *var, pic_value value)
{
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UNUSED(pic);
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var->value = value;
}
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static struct pic_var *
get_var_from_proc(pic_state *pic, struct pic_proc *proc)
{
pic_value v;
if (! pic_proc_p(v)) {
goto typeerror;
}
if (! pic_proc_func_p(pic_proc_ptr(v))) {
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goto typeerror;
}
if (pic_proc_cv_size(pic, proc) != 1) {
goto typeerror;
}
v = pic_proc_cv_ref(pic, proc, 0);
if (! pic_var_p(v)) {
goto typeerror;
}
return pic_var_ptr(v);
typeerror:
pic_error(pic, "expected parameter");
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UNREACHABLE();
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}
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static pic_value
var_call(pic_state *pic)
{
struct pic_proc *proc;
struct pic_var *var;
pic_value v;
int c;
proc = pic_get_proc(pic);
c = pic_get_args(pic, "|o", &v);
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if (c == 0) {
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var = pic_var_ptr(proc->env->regs[0]);
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return pic_var_ref(pic, var);
}
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else if (c == 1) {
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var = pic_var_ptr(proc->env->regs[0]);
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pic_var_set(pic, var, v);
return pic_none_value();
}
else {
pic_abort(pic, "logic flaw");
}
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UNREACHABLE();
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}
struct pic_proc *
pic_wrap_var(pic_state *pic, struct pic_var *var)
{
struct pic_proc *proc;
proc = pic_proc_new(pic, var_call);
pic_proc_cv_init(pic, proc, 1);
pic_proc_cv_set(pic, proc, 0, pic_obj_value(var));
return proc;
}
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struct pic_var *
pic_unwrap_var(pic_state *pic, struct pic_proc *proc)
{
return get_var_from_proc(pic, proc);
}
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static pic_value
pic_var_make_parameter(pic_state *pic)
{
struct pic_proc *conv = NULL;
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struct pic_var *var;
pic_value init;
pic_get_args(pic, "o|l", &init, &conv);
var = pic_var_new(pic, init, conv);
return pic_obj_value(pic_wrap_var(pic, var));
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}
static pic_value
pic_var_parameter_ref(pic_state *pic)
{
struct pic_proc *proc;
struct pic_var *var;
pic_get_args(pic, "l", &proc);
var = get_var_from_proc(pic, proc);
return pic_var_ref(pic, var);
}
static pic_value
pic_var_parameter_set(pic_state *pic)
{
struct pic_proc *proc;
struct pic_var *var;
pic_value v;
pic_get_args(pic, "lo", &proc, &v);
var = get_var_from_proc(pic, proc);
/* no convert */
pic_var_set_force(pic, var, v);
return pic_none_value();
}
static pic_value
pic_var_parameter_converter(pic_state *pic)
{
struct pic_proc *proc;
struct pic_var *var;
pic_get_args(pic, "l", &proc);
var = get_var_from_proc(pic, proc);
if (var->conv) {
return pic_obj_value(var->conv);
}
else {
return pic_false_value();
}
}
void
pic_init_var(pic_state *pic)
{
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pic_deflibrary ("(picrin parameter)") {
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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); /* no convert */
pic_defun(pic, "parameter-converter", pic_var_parameter_converter);
}
}