102 lines
2.0 KiB
C
102 lines
2.0 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 "picrin/extra.h"
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#include "picrin/private/object.h"
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#include "picrin/private/state.h"
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static pic_value
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var_conv(pic_state *pic, pic_value val, pic_value conv)
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{
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if (! pic_false_p(pic, conv)) {
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val = pic_call(pic, conv, 1, val);
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}
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return val;
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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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pic_value self, 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 pic_closure_ref(pic, 0);
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} else {
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pic_closure_set(pic, 0, var_conv(pic, val, pic_closure_ref(pic, 1)));
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return pic_undef_value(pic);
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}
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}
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pic_value
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pic_make_var(pic_state *pic, pic_value init, pic_value conv)
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{
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return pic_lambda(pic, var_call, 2, var_conv(pic, init, conv), conv);
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}
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static pic_value
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dynamic_set(pic_state *pic)
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{
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pic_value var, val;
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pic_get_args(pic, "");
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var = pic_closure_ref(pic, 0);
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val = pic_closure_ref(pic, 1);
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pic_proc_ptr(pic, var)->locals[0] = val;
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return pic_undef_value(pic);
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}
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pic_value
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pic_dynamic_bind(pic_state *pic, pic_value var, pic_value val, pic_value thunk)
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{
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pic_value in, out, new_val, old_val;
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old_val = pic_call(pic, var, 0);
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new_val = var_conv(pic, val, pic_proc_ptr(pic, var)->locals[1]);
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in = pic_lambda(pic, dynamic_set, 2, var, new_val);
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out = pic_lambda(pic, dynamic_set, 2, var, old_val);
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return pic_dynamic_wind(pic, in, thunk, out);
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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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pic_value init, conv = pic_false_value(pic);
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pic_get_args(pic, "o|l", &init, &conv);
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return pic_make_var(pic, init, conv);
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}
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static pic_value
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pic_var_dynamic_bind(pic_state *pic)
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{
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pic_value var, val, thunk;
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pic_get_args(pic, "lol", &var, &val, &thunk);
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if (! (pic_proc_p(pic, var) && pic_proc_ptr(pic, var)->u.f.func == var_call)) {
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pic_error(pic, "parameter required", 1, var);
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}
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return pic_dynamic_bind(pic, var, val, thunk);
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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, "dynamic-bind", pic_var_dynamic_bind);
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}
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