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import { clear_text_content, create_element, empty, init_operations } from './dom/operations.js';
import { HYDRATION_ERROR, HYDRATION_START, PassiveDelegatedEvents } from '../../constants.js';
import { flush_sync, push, pop, current_component_context } from './runtime.js';
import { effect_root, branch } from './reactivity/effects.js';
import {
hydrate_anchor,
hydrate_nodes,
hydrating,
set_hydrate_nodes,
set_hydrating
} from './dom/hydration.js';
import { array_from } from './utils.js';
import { handle_event_propagation } from './dom/elements/events.js';
import { reset_head_anchor } from './dom/blocks/svelte-head.js';
import * as w from './warnings.js';
import * as e from './errors.js';
import { validate_component } from '../shared/validate.js';
/** @type {Set<string>} */
export const all_registered_events = new Set();
/** @type {Set<(events: Array<string>) => void>} */
export const root_event_handles = new Set();
/**
* This is normally true — block effects should run their intro transitions —
* but is false during hydration and mounting (unless `options.intro` is `true`)
* and when creating the children of a `<svelte:element>` that just changed tag
*/
export let should_intro = true;
/** @param {boolean} value */
export function set_should_intro(value) {
should_intro = value;
}
/**
* @param {Element} dom
* @param {string} value
* @returns {void}
*/
export function set_text(dom, value) {
// @ts-expect-error need to add __value to patched prototype
const prev_node_value = dom.__nodeValue;
const next_node_value = stringify(value);
if (hydrating && dom.nodeValue === next_node_value) {
// In case of hydration don't reset the nodeValue as it's already correct.
// @ts-expect-error need to add __nodeValue to patched prototype
dom.__nodeValue = next_node_value;
} else if (prev_node_value !== next_node_value) {
dom.nodeValue = next_node_value;
// @ts-expect-error need to add __className to patched prototype
dom.__nodeValue = next_node_value;
}
}
/**
* @param {Comment} anchor
* @param {void | ((anchor: Comment, slot_props: Record<string, unknown>) => void)} slot_fn
* @param {Record<string, unknown>} slot_props
* @param {null | ((anchor: Comment) => void)} fallback_fn
*/
export function slot(anchor, slot_fn, slot_props, fallback_fn) {
if (slot_fn === undefined) {
if (fallback_fn !== null) {
fallback_fn(anchor);
}
} else {
slot_fn(anchor, slot_props);
}
}
/**
* @param {unknown} value
* @returns {string}
*/
export function stringify(value) {
return typeof value === 'string' ? value : value == null ? '' : value + '';
}
/**
* Mounts a component to the given target and returns the exports and potentially the props (if compiled with `accessors: true`) of the component
*
* @template {Record<string, any>} Props
* @template {Record<string, any>} Exports
* @template {Record<string, any>} Events
* @param {import('../../index.js').ComponentType<import('../../index.js').SvelteComponent<Props, Events>>} component
* @param {{
* target: Document | Element | ShadowRoot;
* anchor?: Node;
* props?: Props;
* events?: { [Property in keyof Events]: (e: Events[Property]) => any };
* context?: Map<any, any>;
* intro?: boolean;
* }} options
* @returns {Exports}
*/
export function mount(component, options) {
if (DEV) {
validate_component(component);
}
const anchor = options.anchor ?? options.target.appendChild(empty());
// Don't flush previous effects to ensure order of outer effects stays consistent
return flush_sync(() => _mount(component, { ...options, anchor }), false);
}
/**
* Hydrates a component on the given target and returns the exports and potentially the props (if compiled with `accessors: true`) of the component
*
* @template {Record<string, any>} Props
* @template {Record<string, any>} Exports
* @template {Record<string, any>} Events
* @param {import('../../index.js').ComponentType<import('../../index.js').SvelteComponent<Props, Events>>} component
* @param {{
* target: Document | Element | ShadowRoot;
* props?: Props;
* events?: { [Property in keyof Events]: (e: Events[Property]) => any };
* context?: Map<any, any>;
* intro?: boolean;
* recover?: boolean;
* }} options
* @returns {Exports}
*/
export function hydrate(component, options) {
if (DEV) {
validate_component(component);
}
const target = options.target;
const previous_hydrate_nodes = hydrate_nodes;
let hydrated = false;
try {
// Don't flush previous effects to ensure order of outer effects stays consistent
return flush_sync(() => {
set_hydrating(true);
var node = target.firstChild;
while (
node &&
(node.nodeType !== 8 || /** @type {Comment} */ (node).data !== HYDRATION_START)
) {
node = node.nextSibling;
}
if (!node) {
throw HYDRATION_ERROR;
}
const anchor = hydrate_anchor(node);
const instance = _mount(component, { ...options, anchor });
// flush_sync will run this callback and then synchronously run any pending effects,
// which don't belong to the hydration phase anymore - therefore reset it here
set_hydrating(false);
hydrated = true;
return instance;
}, false);
} catch (error) {
if (error === HYDRATION_ERROR) {
if (options.recover === false) {
e.hydration_failed();
}
// If an error occured above, the operations might not yet have been initialised.
init_operations();
clear_text_content(target);
set_hydrating(false);
return mount(component, options);
}
throw error;
} finally {
set_hydrating(!!previous_hydrate_nodes);
set_hydrate_nodes(previous_hydrate_nodes);
reset_head_anchor();
}
}
/**
* @template {Record<string, any>} Exports
* @param {import('../../index.js').ComponentType<import('../../index.js').SvelteComponent<any>>} Component
* @param {{
* target: Document | Element | ShadowRoot;
* anchor: Node;
* props?: any;
* events?: any;
* context?: Map<any, any>;
* intro?: boolean;
* }} options
* @returns {Exports}
*/
function _mount(Component, { target, anchor, props = {}, events, context, intro = false }) {
init_operations();
const registered_events = new Set();
const bound_event_listener = handle_event_propagation.bind(null, target);
const bound_document_event_listener = handle_event_propagation.bind(null, document);
/** @param {Array<string>} events */
const event_handle = (events) => {
for (let i = 0; i < events.length; i++) {
const event_name = events[i];
if (!registered_events.has(event_name)) {
registered_events.add(event_name);
// Add the event listener to both the container and the document.
// The container listener ensures we catch events from within in case
// the outer content stops propagation of the event.
target.addEventListener(
event_name,
bound_event_listener,
PassiveDelegatedEvents.includes(event_name)
? {
passive: true
}
: undefined
);
// The document listener ensures we catch events that originate from elements that were
// manually moved outside of the container (e.g. via manual portals).
document.addEventListener(
event_name,
bound_document_event_listener,
PassiveDelegatedEvents.includes(event_name)
? {
passive: true
}
: undefined
);
}
}
};
event_handle(array_from(all_registered_events));
root_event_handles.add(event_handle);
/** @type {Exports} */
// @ts-expect-error will be defined because the render effect runs synchronously
let component = undefined;
const unmount = effect_root(() => {
branch(() => {
if (context) {
push({});
var ctx = /** @type {import('#client').ComponentContext} */ (current_component_context);
ctx.c = context;
}
if (events) {
// We can't spread the object or else we'd lose the state proxy stuff, if it is one
/** @type {any} */ (props).$$events = events;
}
should_intro = intro;
// @ts-expect-error the public typings are not what the actual function looks like
component = Component(anchor, props) || {};
should_intro = true;
if (context) {
pop();
}
});
return () => {
for (const event_name of registered_events) {
target.removeEventListener(event_name, bound_event_listener);
}
root_event_handles.delete(event_handle);
mounted_components.delete(component);
};
});
mounted_components.set(component, unmount);
return component;
}
/**
* References of the components that were mounted or hydrated.
* Uses a `WeakMap` to avoid memory leaks.
*/
let mounted_components = new WeakMap();
/**
* Unmounts a component that was previously mounted using `mount` or `hydrate`.
* @param {Record<string, any>} component
*/
export function unmount(component) {
const fn = mounted_components.get(component);
if (DEV && !fn) {
w.lifecycle_double_unmount();
// eslint-disable-next-line no-console
console.trace('stack trace');
}
fn?.();
}
/**
* @param {Record<string, any>} props
* @returns {Record<string, any>}
*/
export function sanitize_slots(props) {
const sanitized = { ...props.$$slots };
if (props.children) sanitized.default = props.children;
return sanitized;
}
/**
* @param {Node} target
* @param {string} style_sheet_id
* @param {string} styles
*/
export async function append_styles(target, style_sheet_id, styles) {
// Wait a tick so that the template is added to the dom, else getRootNode() will yield wrong results
// If it turns out that this results in noticeable flickering, we need to do something like doing the
// append outside and adding code in mount that appends all stylesheets (similar to how we do it with event delegation)
await Promise.resolve();
const append_styles_to = get_root_for_style(target);
if (!append_styles_to.getElementById(style_sheet_id)) {
const style = create_element('style');
style.id = style_sheet_id;
style.textContent = styles;
const target = /** @type {Document} */ (append_styles_to).head || append_styles_to;
target.appendChild(style);
}
}
/**
* @param {Node} node
*/
function get_root_for_style(node) {
if (!node) return document;
const root = node.getRootNode ? node.getRootNode() : node.ownerDocument;
if (root && /** @type {ShadowRoot} */ (root).host) {
return /** @type {ShadowRoot} */ (root);
}
return /** @type {Document} */ (node.ownerDocument);
}
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