106 lines
1.9 KiB
C
106 lines
1.9 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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static pic_value
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var_get(pic_state *pic, struct pic_proc *var)
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{
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pic_value elem, it;
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struct pic_weak *weak;
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pic_for_each (elem, pic->ptable, it) {
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weak = pic_weak_ptr(elem);
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if (pic_weak_has(pic, weak, var)) {
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return pic_weak_ref(pic, weak, var);
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}
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}
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pic_panic(pic, "logic flaw");
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}
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static pic_value
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var_set(pic_state *pic, struct pic_proc *var, pic_value val)
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{
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struct pic_weak *weak;
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weak = pic_weak_ptr(pic_car(pic, pic->ptable));
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pic_weak_set(pic, weak, var, val);
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return pic_undef_value();
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}
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static pic_value
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var_call(pic_state *pic)
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{
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struct pic_proc *self;
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pic_value val;
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int n;
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n = pic_get_args(pic, "&|o", &self, &val);
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if (n == 0) {
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return var_get(pic, self);
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} else {
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pic_value conv;
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conv = pic_closure_ref(pic, 0);
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if (! pic_false_p(conv)) {
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val = pic_call(pic, pic_proc_ptr(conv), 1, val);
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}
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return var_set(pic, self, val);
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}
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}
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struct pic_proc *
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pic_make_var(pic_state *pic, pic_value init, struct pic_proc *conv)
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{
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struct pic_proc *var;
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pic_value c = pic_false_value();
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if (conv != NULL) {
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c = pic_obj_value(conv);
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}
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var = pic_lambda(pic, var_call, 1, c);
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pic_call(pic, var, 1, init);
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return var;
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}
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static pic_value
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pic_var_make_parameter(pic_state *pic)
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{
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struct pic_proc *conv = NULL;
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pic_value init;
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pic_get_args(pic, "o|l", &init, &conv);
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return pic_obj_value(pic_make_var(pic, init, conv));
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}
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static pic_value
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pic_var_with_parameter(pic_state *pic)
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{
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struct pic_proc *body;
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pic_value val;
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pic_get_args(pic, "l", &body);
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pic->ptable = pic_cons(pic, pic_obj_value(pic_make_weak(pic)), pic->ptable);
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val = pic_call(pic, body, 0);
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pic->ptable = pic_cdr(pic, pic->ptable);
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return val;
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}
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void
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pic_init_var(pic_state *pic)
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{
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pic_defun(pic, "make-parameter", pic_var_make_parameter);
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pic_defun(pic, "with-parameter", pic_var_with_parameter);
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}
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