From c227fb7cc9e30d6a4330cdad34b0b2a53b014d93 Mon Sep 17 00:00:00 2001
From: David Vazgenovich Shakaryan <dvshakaryan@gmail.com>
Date: Mon, 9 May 2022 18:02:30 -0700
Subject: web: add support for child DOM elements and text nodes

---
 web/web_dom.c | 54 ++++++++++++++++++++++++++++++++++++++++++++----------
 1 file changed, 44 insertions(+), 10 deletions(-)

(limited to 'web/web_dom.c')

diff --git a/web/web_dom.c b/web/web_dom.c
index eadca7f..cff0459 100644
--- a/web/web_dom.c
+++ b/web/web_dom.c
@@ -7,41 +7,60 @@
 
 #include <emscripten/emscripten.h>
 
+static struct dom_elem *dom_node_init(char *type, int size_attrs)
+{
+	struct dom_elem *e = calloc(1, sizeof(*e));
+	e->type = type; // string literal, not freed
+
+	e->size_attrs = size_attrs;
+	e->attr_names = malloc(size_attrs * sizeof(*(e->attr_names)));
+	e->attr_vals = malloc(size_attrs * sizeof(*(e->attr_vals)));
+
+	return e;
+}
+
 struct dom_elem *dom_elem_init(char *ns, char *name, int size_attrs)
 {
-	struct dom_elem *e = malloc(sizeof(*e));
+	struct dom_elem *e = dom_node_init("element", size_attrs);
 
 	e->ns = ns ? strdup(ns) : NULL;
 	e->name = strdup(name);
-	e->content = NULL;
 
-	e->n_attrs = 0;
-	e->size_attrs = size_attrs;
-	e->attr_names = malloc(size_attrs * sizeof(*(e->attr_names)));
-	e->attr_vals = malloc(size_attrs * sizeof(*(e->attr_vals)));
+	return e;
+}
+
+struct dom_elem *dom_text_init(char *content)
+{
+	struct dom_elem *e = dom_node_init("text", 0);
+	e->content = strdup(content);
 
 	return e;
 }
 
 void dom_elem_free(struct dom_elem *e)
 {
-	for(int i = 0; i < e->n_attrs; ++i) {
+	for (int i = 0; i < e->n_attrs; ++i) {
 		free(e->attr_names[i]);
 		free(e->attr_vals[i]);
 	}
 
+	for (int i = 0; i < e->n_children; ++i) {
+		dom_elem_free(e->children[i]);
+	}
+
 	free(e->ns);
 	free(e->name);
 	free(e->content);
 	free(e->attr_names);
 	free(e->attr_vals);
+	free(e->children);
 	free(e);
 }
 
 void dom_elem_add_attr(struct dom_elem *e, char *name, char *val)
 {
 	if (e->n_attrs == e->size_attrs) {
-		e->size_attrs *= 2;
+		e->size_attrs += e->size_attrs ? e->size_attrs : 1;
 		e->attr_names = realloc(e->attr_names,
 			e->size_attrs * sizeof(*(e->attr_names)));
 		e->attr_vals = realloc(e->attr_vals,
@@ -59,16 +78,31 @@ void dom_elem_add_attrd(struct dom_elem *e, char *name, double val)
 	dom_elem_add_attr(e, name, str);
 }
 
+void dom_elem_add_child(struct dom_elem *e, struct dom_elem *child)
+{
+	if (e->n_children == e->size_children) {
+		e->size_children += e->size_children ? e->size_children : 1;
+		e->children = realloc(e->children,
+			e->size_children * sizeof(*(e->children)));
+	}
+
+	e->children[e->n_children++] = child;
+}
+
 inline void dom_append_elemv(char *sel, int elemc, struct dom_elem **elemv)
 {
-	EM_ASM({elemAppendElemv($0, $1, $2, $3, $4, $5, $6, $7, $8)},
+	EM_ASM({elemAppendElemv($0, $1, $2, $3, $4, $5, $6, $7, $8, $9, $10,
+			$11)},
 		sel, elemc, elemv,
+		offsetof(struct dom_elem, type),
 		offsetof(struct dom_elem, ns),
 		offsetof(struct dom_elem, name),
 		offsetof(struct dom_elem, content),
 		offsetof(struct dom_elem, n_attrs),
 		offsetof(struct dom_elem, attr_names),
-		offsetof(struct dom_elem, attr_vals));
+		offsetof(struct dom_elem, attr_vals),
+		offsetof(struct dom_elem, n_children),
+		offsetof(struct dom_elem, children));
 }
 
 inline char *dom_get_content(char *sel)
-- 
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