from_namespace() — svelte Function Reference

Source Code

packages/svelte/src/internal/client/dom/template.js lines 92–138

function from_namespace(content, flags, ns = 'svg') {
	/**
	 * Whether or not the first item is a text/element node. If not, we need to
	 * create an additional comment node to act as `effect.nodes.start`
	 */
	var has_start = !content.startsWith('<!>');

	var is_fragment = (flags & TEMPLATE_FRAGMENT) !== 0;
	var wrapped = `<${ns}>${has_start ? content : '<!>' + content}</${ns}>`;

	/** @type {Element | DocumentFragment} */
	var node;

	return () => {
		if (hydrating) {
			assign_nodes(hydrate_node, null);
			return hydrate_node;
		}

		if (!node) {
			var fragment = /** @type {DocumentFragment} */ (create_fragment_from_html(wrapped));
			var root = /** @type {Element} */ (get_first_child(fragment));

			if (is_fragment) {
				node = document.createDocumentFragment();
				while (get_first_child(root)) {
					node.appendChild(/** @type {TemplateNode} */ (get_first_child(root)));
				}
			} else {
				node = /** @type {Element} */ (get_first_child(root));
			}
		}

		var clone = /** @type {TemplateNode} */ (node.cloneNode(true));

		if (is_fragment) {
			var start = /** @type {TemplateNode} */ (get_first_child(clone));
			var end = /** @type {TemplateNode} */ (clone.lastChild);

			assign_nodes(start, end);
		} else {
			assign_nodes(clone, clone);
		}

		return clone;
	};
}