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import { destroy_effect, render_effect } from '../../reactivity/effects.js';
import { append } from '../template.js';
import { define_property, object_keys } from '../../../shared/utils.js';
/**
* @typedef {Object} CustomElementPropDefinition
* @property {string} [attribute]
* @property {boolean} [reflect]
* @property {'String'|'Boolean'|'Number'|'Array'|'Object'} [type]
*/
/** @type {any} */
let SvelteElement;
if (typeof HTMLElement === 'function') {
SvelteElement = class extends HTMLElement {
/** The Svelte component constructor */
$$ctor;
/** Slots */
$$s;
/** @type {any} The Svelte component instance */
$$c;
/** Whether or not the custom element is connected */
$$cn = false;
/** @type {Record<string, any>} Component props data */
$$d = {};
/** `true` if currently in the process of reflecting component props back to attributes */
$$r = false;
/** @type {Record<string, CustomElementPropDefinition>} Props definition (name, reflected, type etc) */
$$p_d = {};
/** @type {Record<string, EventListenerOrEventListenerObject[]>} Event listeners */
$$l = {};
/** @type {Map<EventListenerOrEventListenerObject, Function>} Event listener unsubscribe functions */
$$l_u = new Map();
/** @type {any} The managed render effect for reflecting attributes */
$$me;
/**
* @param {*} $$componentCtor
* @param {*} $$slots
* @param {*} use_shadow_dom
*/
constructor($$componentCtor, $$slots, use_shadow_dom) {
super();
this.$$ctor = $$componentCtor;
this.$$s = $$slots;
if (use_shadow_dom) {
this.attachShadow({ mode: 'open' });
}
}
/**
* @param {string} type
* @param {EventListenerOrEventListenerObject} listener
* @param {boolean | AddEventListenerOptions} [options]
*/
addEventListener(type, listener, options) {
// We can't determine upfront if the event is a custom event or not, so we have to
// listen to both. If someone uses a custom event with the same name as a regular
// browser event, this fires twice - we can't avoid that.
this.$$l[type] = this.$$l[type] || [];
this.$$l[type].push(listener);
if (this.$$c) {
const unsub = this.$$c.$on(type, listener);
this.$$l_u.set(listener, unsub);
}
super.addEventListener(type, listener, options);
}
/**
* @param {string} type
* @param {EventListenerOrEventListenerObject} listener
* @param {boolean | AddEventListenerOptions} [options]
*/
removeEventListener(type, listener, options) {
super.removeEventListener(type, listener, options);
if (this.$$c) {
const unsub = this.$$l_u.get(listener);
if (unsub) {
unsub();
this.$$l_u.delete(listener);
}
}
}
async connectedCallback() {
this.$$cn = true;
if (!this.$$c) {
// We wait one tick to let possible child slot elements be created/mounted
await Promise.resolve();
if (!this.$$cn || this.$$c) {
return;
}
/** @param {string} name */
function create_slot(name) {
/**
* @param {Element} anchor
*/
return (anchor) => {
const slot = document.createElement('slot');
if (name !== 'default') slot.name = name;
append(anchor, slot);
};
}
/** @type {Record<string, any>} */
const $$slots = {};
const existing_slots = get_custom_elements_slots(this);
for (const name of this.$$s) {
if (name in existing_slots) {
if (name === 'default' && !this.$$d.children) {
this.$$d.children = create_slot(name);
$$slots.default = true;
} else {
$$slots[name] = create_slot(name);
}
}
}
for (const attribute of this.attributes) {
// this.$$data takes precedence over this.attributes
const name = this.$$g_p(attribute.name);
if (!(name in this.$$d)) {
this.$$d[name] = get_custom_element_value(name, attribute.value, this.$$p_d, 'toProp');
}
}
// Port over props that were set programmatically before ce was initialized
for (const key in this.$$p_d) {
// @ts-expect-error
if (!(key in this.$$d) && this[key] !== undefined) {
// @ts-expect-error
this.$$d[key] = this[key]; // don't transform, these were set through JavaScript
// @ts-expect-error
delete this[key]; // remove the property that shadows the getter/setter
}
}
this.$$c = createClassComponent({
component: this.$$ctor,
target: this.shadowRoot || this,
props: {
...this.$$d,
$$slots,
$$host: this
}
});
// Reflect component props as attributes
this.$$me = render_effect(() => {
this.$$r = true;
for (const key of object_keys(this.$$c)) {
if (!this.$$p_d[key]?.reflect) continue;
this.$$d[key] = this.$$c[key];
const attribute_value = get_custom_element_value(
key,
this.$$d[key],
this.$$p_d,
'toAttribute'
);
if (attribute_value == null) {
this.removeAttribute(this.$$p_d[key].attribute || key);
} else {
this.setAttribute(this.$$p_d[key].attribute || key, attribute_value);
}
}
this.$$r = false;
});
for (const type in this.$$l) {
for (const listener of this.$$l[type]) {
const unsub = this.$$c.$on(type, listener);
this.$$l_u.set(listener, unsub);
}
}
this.$$l = {};
}
}
// We don't need this when working within Svelte code, but for compatibility of people using this outside of Svelte
// and setting attributes through setAttribute etc, this is helpful
/**
* @param {string} attr
* @param {string} _oldValue
* @param {string} newValue
*/
attributeChangedCallback(attr, _oldValue, newValue) {
if (this.$$r) return;
attr = this.$$g_p(attr);
this.$$d[attr] = get_custom_element_value(attr, newValue, this.$$p_d, 'toProp');
this.$$c?.$set({ [attr]: this.$$d[attr] });
}
disconnectedCallback() {
this.$$cn = false;
// In a microtask, because this could be a move within the DOM
Promise.resolve().then(() => {
if (!this.$$cn && this.$$c) {
this.$$c.$destroy();
destroy_effect(this.$$me);
this.$$c = undefined;
}
});
}
/**
* @param {string} attribute_name
*/
$$g_p(attribute_name) {
return (
object_keys(this.$$p_d).find(
(key) =>
this.$$p_d[key].attribute === attribute_name ||
(!this.$$p_d[key].attribute && key.toLowerCase() === attribute_name)
) || attribute_name
);
}
};
}
/**
* @param {string} prop
* @param {any} value
* @param {Record<string, CustomElementPropDefinition>} props_definition
* @param {'toAttribute' | 'toProp'} [transform]
*/
function get_custom_element_value(prop, value, props_definition, transform) {
const type = props_definition[prop]?.type;
value = type === 'Boolean' && typeof value !== 'boolean' ? value != null : value;
if (!transform || !props_definition[prop]) {
return value;
} else if (transform === 'toAttribute') {
switch (type) {
case 'Object':
case 'Array':
return value == null ? null : JSON.stringify(value);
case 'Boolean':
return value ? '' : null;
case 'Number':
return value == null ? null : value;
default:
return value;
}
} else {
switch (type) {
case 'Object':
case 'Array':
return value && JSON.parse(value);
case 'Boolean':
return value; // conversion already handled above
case 'Number':
return value != null ? +value : value;
default:
return value;
}
}
}
/**
* @param {HTMLElement} element
*/
function get_custom_elements_slots(element) {
/** @type {Record<string, true>} */
const result = {};
element.childNodes.forEach((node) => {
result[/** @type {Element} node */ (node).slot || 'default'] = true;
});
return result;
}
/**
* @internal
*
* Turn a Svelte component into a custom element.
* @param {any} Component A Svelte component function
* @param {Record<string, CustomElementPropDefinition>} props_definition The props to observe
* @param {string[]} slots The slots to create
* @param {string[]} exports Explicitly exported values, other than props
* @param {boolean} use_shadow_dom Whether to use shadow DOM
* @param {(ce: new () => HTMLElement) => new () => HTMLElement} [extend]
*/
export function create_custom_element(
Component,
props_definition,
slots,
exports,
use_shadow_dom,
extend
) {
let Class = class extends SvelteElement {
constructor() {
super(Component, slots, use_shadow_dom);
this.$$p_d = props_definition;
}
static get observedAttributes() {
return object_keys(props_definition).map((key) =>
(props_definition[key].attribute || key).toLowerCase()
);
}
};
object_keys(props_definition).forEach((prop) => {
define_property(Class.prototype, prop, {
get() {
return this.$$c && prop in this.$$c ? this.$$c[prop] : this.$$d[prop];
},
set(value) {
value = get_custom_element_value(prop, value, props_definition);
this.$$d[prop] = value;
this.$$c?.$set({ [prop]: value });
}
});
});
exports.forEach((property) => {
define_property(Class.prototype, property, {
get() {
return this.$$c?.[property];
}
});
});
if (extend) {
// @ts-expect-error - assigning here is fine
Class = extend(Class);
}
Component.element = /** @type {any} */ Class;
return Class;
}
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