109 lines
2.3 KiB
C
109 lines
2.3 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 "value.h"
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#include "object.h"
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KHASH_DEFINE(attr, struct object *, pic_value, kh_ptr_hash_func, kh_ptr_hash_equal)
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static pic_value
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attr_call(pic_state *pic)
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{
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pic_value self, key, val;
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int n;
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n = pic_get_args(pic, "&o|o", &self, &key, &val);
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if (! pic_obj_p(pic, key)) {
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pic_error(pic, "attempted to set a non-object key", 1, key);
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}
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if (n == 1) {
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if (! pic_attr_has(pic, self, key)) {
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return pic_false_value(pic);
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}
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return pic_attr_ref(pic, self, key);
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} else {
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if (pic_false_p(pic, val)) {
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if (pic_attr_has(pic, self, key)) {
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pic_attr_del(pic, self, key);
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}
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} else {
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pic_attr_set(pic, self, key, val);
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}
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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_attr(pic_state *pic)
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{
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struct attr *attr;
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attr = (struct attr *)pic_obj_alloc(pic, PIC_TYPE_ATTR);
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attr->prev = NULL;
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kh_init(attr, &attr->hash);
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return pic_lambda(pic, attr_call, 1, obj_value(pic, attr));
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}
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pic_value
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pic_attr_ref(pic_state *pic, pic_value attr, pic_value key)
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{
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khash_t(attr) *h = &attr_ptr(pic, proc_ptr(pic, attr)->env->regs[0])->hash;
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int it;
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it = kh_get(attr, h, pic_ptr(pic, key));
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if (it == kh_end(h)) {
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pic_error(pic, "element not found for given key", 1, key);
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}
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return kh_val(h, it);
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}
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void
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pic_attr_set(pic_state *pic, pic_value attr, pic_value key, pic_value val)
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{
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khash_t(attr) *h = &attr_ptr(pic, proc_ptr(pic, attr)->env->regs[0])->hash;
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int ret;
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int it;
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it = kh_put(attr, h, pic_ptr(pic, key), &ret);
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kh_val(h, it) = val;
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}
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bool
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pic_attr_has(pic_state *pic, pic_value attr, pic_value key)
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{
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khash_t(attr) *h = &attr_ptr(pic, proc_ptr(pic, attr)->env->regs[0])->hash;
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return kh_get(attr, h, pic_ptr(pic, key)) != kh_end(h);
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}
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void
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pic_attr_del(pic_state *pic, pic_value attr, pic_value key)
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{
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khash_t(attr) *h = &attr_ptr(pic, proc_ptr(pic, attr)->env->regs[0])->hash;
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int it;
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it = kh_get(attr, h, pic_ptr(pic, key));
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if (it == kh_end(h)) {
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pic_error(pic, "element not found for given key", 1, key);
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}
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kh_del(attr, h, it);
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}
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static pic_value
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pic_attr_make_attribute(pic_state *pic)
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{
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pic_get_args(pic, "");
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return pic_make_attr(pic);
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}
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void
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pic_init_attr(pic_state *pic)
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{
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pic_defun(pic, "make-attribute", pic_attr_make_attribute);
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}
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