Defined basic DOM operations.

1 files changed, 88 insertions, 0 deletions

diff --git a/wv_dom.c b/wv_dom.c
new file mode 100644
index 0000000..ee24e98
--- /dev/null
+++ b/wv_dom.c
@@ -0,0 +1,88 @@
+#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_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_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;
+}
+