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#include <string.h>
#include <stdio.h>
#include "wv_dom.h"
wv_ref wv_node_new(struct wv_arena *arena, wv_node_type type)
{
wv_ref ref;
struct wv_node *node;
ref = wv_arena_alloc(arena, sizeof(struct wv_node));
node = (struct wv_node *)WV_ADDR(arena, ref);
memset(node, 0, sizeof(struct wv_node));
node->type = type;
return ref;
}
void wv_node_append(struct wv_arena *arena, wv_ref parent_ref,
wv_ref child_ref)
{
struct wv_node *p, *c, *last;
if (!parent_ref || !child_ref)
return;
p = (struct wv_node *)WV_ADDR(arena, parent_ref);
c = (struct wv_node *)WV_ADDR(arena, child_ref);
c->parent = parent_ref;
if (!p->first_child) {
/* This is the parent's only child */
p->first_child = child_ref;
} else {
/* Link to the current tail of the child list */
last = (struct wv_node *)WV_ADDR(arena, p->last_child);
last->next_sibling = child_ref;
c->prev_sibling = p->last_child;
}
p->last_child = child_ref;
}
void wv_attr_set(struct wv_arena *arena, wv_ref node_ref,
wv_ref key_str, wv_ref val_str)
{
wv_ref attr_ref;
struct wv_node *n;
struct wv_attr *a;
n = (struct wv_node *)WV_ADDR(arena, node_ref);
if (n->type != WV_NODE_ELEMENT)
return;
attr_ref = wv_arena_alloc(arena, sizeof(struct wv_attr));
a = (struct wv_attr *)WV_ADDR(arena, attr_ref);
a->key = key_str;
a->val = val_str;
// Link attribute to the head of the list (prepend)
a->next = n->u.element.attr_head;
n->u.element.attr_head = attr_ref;
}
wv_ref wv_attr_get(struct wv_arena *arena, wv_ref node_ref,
const char *key_name)
{
wv_ref curr;
struct wv_node *n;
struct wv_attr *a;
n = (struct wv_node *)WV_ADDR(arena, node_ref);
if (n->type != WV_NODE_ELEMENT)
return 0;
curr = n->u.element.attr_head;
while (curr != 0) {
a = (struct wv_attr *)WV_ADDR(arena, curr);
const char *attr_key = (const char *)WV_ADDR(arena, a->key);
if (strcmp(attr_key, key_name) == 0)
return a->val;
curr = a->next;
}
return 0;
}
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