only optimise <title> inside <:Head>

src/generators/Generator.ts

@@ -721,6 +721,14 @@ export default class Generator {
 		let indexes = new Set();
 		const indexesStack: Set<string>[] = [indexes];
 
+		function parentIsHead(node) {
+			if (!node) return false;
+			if (node.type === 'Component' || node.type === 'Element') return false;
+			if (node.type === 'Head') return true;
+
+			return parentIsHead(node.parent);
+		}
+
 		walk(html, {
 			enter(node: Node, parent: Node, key: string) {
 				// TODO this is hacky as hell
@@ -738,7 +746,7 @@ export default class Generator {
 				} else if (node.name === ':Head') { // TODO do this in parse?
 					node.type = 'Head';
 					Object.setPrototypeOf(node, nodes.Head.prototype);
-				} else if (node.type === 'Element' && node.name === 'title') { // TODO do this in parse?
+				} else if (node.type === 'Element' && node.name === 'title' && parentIsHead(parent)) { // TODO do this in parse?
 					node.type = 'Title';
 					Object.setPrototypeOf(node, nodes.Title.prototype);
 				} else if (node.type === 'Element' && node.name === 'slot' && !generator.customElement) {

test/js/samples/svg-title/expected-bundle.js

@@ -0,0 +1,232 @@
+function noop() {}
+
+function assign(target) {
+	var k,
+		source,
+		i = 1,
+		len = arguments.length;
+	for (; i < len; i++) {
+		source = arguments[i];
+		for (k in source) target[k] = source[k];
+	}
+
+	return target;
+}
+
+function appendNode(node, target) {
+	target.appendChild(node);
+}
+
+function insertNode(node, target, anchor) {
+	target.insertBefore(node, anchor);
+}
+
+function detachNode(node) {
+	node.parentNode.removeChild(node);
+}
+
+function createSvgElement(name) {
+	return document.createElementNS('http://www.w3.org/2000/svg', name);
+}
+
+function createText(data) {
+	return document.createTextNode(data);
+}
+
+function blankObject() {
+	return Object.create(null);
+}
+
+function destroy(detach) {
+	this.destroy = noop;
+	this.fire('destroy');
+	this.set = this.get = noop;
+
+	if (detach !== false) this._fragment.u();
+	this._fragment.d();
+	this._fragment = this._state = null;
+}
+
+function differs(a, b) {
+	return a !== b || ((a && typeof a === 'object') || typeof a === 'function');
+}
+
+function dispatchObservers(component, group, changed, newState, oldState) {
+	for (var key in group) {
+		if (!changed[key]) continue;
+
+		var newValue = newState[key];
+		var oldValue = oldState[key];
+
+		var callbacks = group[key];
+		if (!callbacks) continue;
+
+		for (var i = 0; i < callbacks.length; i += 1) {
+			var callback = callbacks[i];
+			if (callback.__calling) continue;
+
+			callback.__calling = true;
+			callback.call(component, newValue, oldValue);
+			callback.__calling = false;
+		}
+	}
+}
+
+function fire(eventName, data) {
+	var handlers =
+		eventName in this._handlers && this._handlers[eventName].slice();
+	if (!handlers) return;
+
+	for (var i = 0; i < handlers.length; i += 1) {
+		handlers[i].call(this, data);
+	}
+}
+
+function get(key) {
+	return key ? this._state[key] : this._state;
+}
+
+function init(component, options) {
+	component._observers = { pre: blankObject(), post: blankObject() };
+	component._handlers = blankObject();
+	component._bind = options._bind;
+
+	component.options = options;
+	component.root = options.root || component;
+	component.store = component.root.store || options.store;
+}
+
+function observe(key, callback, options) {
+	var group = options && options.defer
+		? this._observers.post
+		: this._observers.pre;
+
+	(group[key] || (group[key] = [])).push(callback);
+
+	if (!options || options.init !== false) {
+		callback.__calling = true;
+		callback.call(this, this._state[key]);
+		callback.__calling = false;
+	}
+
+	return {
+		cancel: function() {
+			var index = group[key].indexOf(callback);
+			if (~index) group[key].splice(index, 1);
+		}
+	};
+}
+
+function on(eventName, handler) {
+	if (eventName === 'teardown') return this.on('destroy', handler);
+
+	var handlers = this._handlers[eventName] || (this._handlers[eventName] = []);
+	handlers.push(handler);
+
+	return {
+		cancel: function() {
+			var index = handlers.indexOf(handler);
+			if (~index) handlers.splice(index, 1);
+		}
+	};
+}
+
+function set(newState) {
+	this._set(assign({}, newState));
+	if (this.root._lock) return;
+	this.root._lock = true;
+	callAll(this.root._beforecreate);
+	callAll(this.root._oncreate);
+	callAll(this.root._aftercreate);
+	this.root._lock = false;
+}
+
+function _set(newState) {
+	var oldState = this._state,
+		changed = {},
+		dirty = false;
+
+	for (var key in newState) {
+		if (differs(newState[key], oldState[key])) changed[key] = dirty = true;
+	}
+	if (!dirty) return;
+
+	this._state = assign({}, oldState, newState);
+	this._recompute(changed, this._state);
+	if (this._bind) this._bind(changed, this._state);
+
+	if (this._fragment) {
+		dispatchObservers(this, this._observers.pre, changed, this._state, oldState);
+		this._fragment.p(changed, this._state);
+		dispatchObservers(this, this._observers.post, changed, this._state, oldState);
+	}
+}
+
+function callAll(fns) {
+	while (fns && fns.length) fns.pop()();
+}
+
+function _mount(target, anchor) {
+	this._fragment.m(target, anchor);
+}
+
+function _unmount() {
+	if (this._fragment) this._fragment.u();
+}
+
+var proto = {
+	destroy: destroy,
+	get: get,
+	fire: fire,
+	observe: observe,
+	on: on,
+	set: set,
+	teardown: destroy,
+	_recompute: noop,
+	_set: _set,
+	_mount: _mount,
+	_unmount: _unmount
+};
+
+/* generated by Svelte vX.Y.Z */
+function create_main_fragment(state, component) {
+	var svg, title, text;
+
+	return {
+		c: function create() {
+			svg = createSvgElement("svg");
+			title = createSvgElement("title");
+			text = createText("a title");
+		},
+
+		m: function mount(target, anchor) {
+			insertNode(svg, target, anchor);
+			appendNode(title, svg);
+			appendNode(text, title);
+		},
+
+		p: noop,
+
+		u: function unmount() {
+			detachNode(svg);
+		},
+
+		d: noop
+	};
+}
+
+function SvelteComponent(options) {
+	init(this, options);
+	this._state = assign({}, options.data);
+
+	this._fragment = create_main_fragment(this._state, this);
+
+	if (options.target) {
+		this._fragment.c();
+		this._fragment.m(options.target, options.anchor || null);
+	}
+}
+
+assign(SvelteComponent.prototype, proto);
+
+export default SvelteComponent;

test/js/samples/svg-title/expected.js

@@ -0,0 +1,43 @@
+/* generated by Svelte vX.Y.Z */
+import { appendNode, assign, createSvgElement, createText, detachNode, init, insertNode, noop, proto } from "svelte/shared.js";
+
+function create_main_fragment(state, component) {
+	var svg, title, text;
+
+	return {
+		c: function create() {
+			svg = createSvgElement("svg");
+			title = createSvgElement("title");
+			text = createText("a title");
+		},
+
+		m: function mount(target, anchor) {
+			insertNode(svg, target, anchor);
+			appendNode(title, svg);
+			appendNode(text, title);
+		},
+
+		p: noop,
+
+		u: function unmount() {
+			detachNode(svg);
+		},
+
+		d: noop
+	};
+}
+
+function SvelteComponent(options) {
+	init(this, options);
+	this._state = assign({}, options.data);
+
+	this._fragment = create_main_fragment(this._state, this);
+
+	if (options.target) {
+		this._fragment.c();
+		this._fragment.m(options.target, options.anchor || null);
+	}
+}
+
+assign(SvelteComponent.prototype, proto);
+export default SvelteComponent;

test/js/samples/svg-title/input.html

@@ -0,0 +1,3 @@
+<svg>
+	<title>a title</title>
+</svg>