From 95428c41f0ee3ac108cf1a4acfaa67157ad954dc Mon Sep 17 00:00:00 2001
From: Sadeep Madurange <sadeep@asciimx.com>
Date: Sun, 24 May 2026 18:00:38 +0800
Subject: Build DOM.

---
 dom.c | 132 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++------
 1 file changed, 121 insertions(+), 11 deletions(-)

(limited to 'dom.c')

diff --git a/dom.c b/dom.c
index a4d75e1..71679bc 100644
--- a/dom.c
+++ b/dom.c
@@ -1,37 +1,147 @@
 #include <stdio.h>
+#include <err.h>
 
+#include "mem.h"
 #include "dom.h"
+#include "vec.h"
 #include "parse.h"
 
-void init_dom(const char *html)
+static struct node **nodes;
+static size_t count;
+static size_t capacity;
+
+static struct vec stack;
+static struct node *root;
+
+static inline struct node *node_alloc(void)
+{
+	struct node *v;
+
+	if (count == capacity) {
+		capacity = capacity ? capacity * 2 : 64;
+		nodes = REALLOC(nodes, capacity * sizeof(struct node *));
+	}
+
+	v = CALLOC(1, sizeof(struct node));
+	nodes[count++] = v;
+	return v;
+}
+
+struct node *dom_init(const char *html)
 {
+	vec_init(&stack, sizeof(struct node *));
 	parse(html);
+	return root;
+}
+
+void dom_free(void)
+{
+	size_t i;
+
+	for (i = 0; i < count; i++)
+		free(nodes[i]);
+	free(nodes);
+	nodes = NULL;
+	count = 0;
+	capacity = 0;
+
+	vec_free(&stack);
+}
+
+static inline int is_self_closing(tag_type tag)
+{
+	switch (tag) {
+	case TAG_META:
+	case TAG_LINK:
+		return 1;
+	default:
+		return 0;
+	}
+}
+
+static inline void close_tag(struct node *v)
+{
+	void *top;
+	struct node *parent;
+
+	top = vec_top(&stack);
+	if (!top) {
+		root = v;
+		return;
+	}
+
+	parent = *(struct node **)top;
+	v->parent = parent;
+
+	if (!parent->first_child) {
+		parent->first_child = v;
+		parent->last_child = v;
+	} else {
+		parent->last_child->next_sibling = v;
+		parent->last_child = v;
+	}
 }
 
-/* Parser event handlers */
 extern void on_open(const char *tag, size_t n)
 {
-	printf("Tag opened: %.*s\n", (int)n, tag);
+	struct node *v;
+
+	v = node_alloc();	
+	v->tag = str_to_tag(tag, n);
+	vec_push(&stack, &v);
+}
+
+extern void on_open_end(void)
+{
+	struct node *v;
+
+	v = *(struct node **)vec_top(&stack);
+	if (is_self_closing(v->tag)) {
+		v = *(struct node **)vec_pop(&stack);
+		close_tag(v);
+	}
 }
 
 extern void on_close(const char *tag, size_t n)
 {
-	printf("Tag closed: %.*s\n", (int)n, tag);
+	tag_type type;
+	struct node *top;
+
+	type = str_to_tag(tag, n);
+	top = *(struct node **)vec_top(&stack);
+	if (top->tag != type)
+		errx(1, "Unmatched closing tag: %.*s", (int)n, tag);
+
+	top = *(struct node **)vec_pop(&stack);
+	close_tag(top);
 }
 
 extern void on_text(const char *text, size_t n)
 {
-	printf("Text: %.*s\n", (int)n, text);
+	struct node *v;
+
+	v = node_alloc();	
+	v->tag = TAG_TEXT;
+	v->text = text;
+	v->textlen = n;
+	close_tag(v);
 }
 
-extern void on_attr(const char *name, size_t nname, const char *val, 
-	size_t nval)
+extern void on_attr(const char *name, size_t nname, 
+	const char *val, size_t nval)
 {
-	printf("Attribute: name=%.*s", (int)nname, name);
+	struct attr *a;
+	struct node *v;
 
-	if (val && nval > 0)
-		printf(", value=%.*s", (int)nval, val);
+	a = MALLOC(sizeof(struct attr));
+	a->key = name;
+	a->keylen = nname;
+	a->val = val;
+	a->vallen = nval;
+	a->next = NULL;
 
-	printf("\n");
+	v = *(struct node **)vec_top(&stack);
+	a->next = v->attrs;
+	v->attrs = a;
 }
 
-- 
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