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import { hydrate_node, hydrating, set_hydrate_node } from './hydration.js';
import { DEV } from 'esm-env';
import { init_array_prototype_warnings } from '../dev/equality.js';
import { get_descriptor } from '../../shared/utils.js';
// export these for reference in the compiled code, making global name deduplication unnecessary
/** @type {Window} */
export var $window;
/** @type {Document} */
export var $document;
/** @type {() => Node | null} */
var first_child_getter;
/** @type {() => Node | null} */
var next_sibling_getter;
/**
* Initialize these lazily to avoid issues when using the runtime in a server context
* where these globals are not available while avoiding a separate server entry point
*/
export function init_operations() {
if ($window !== undefined) {
return;
}
$window = window;
$document = document;
var element_prototype = Element.prototype;
var node_prototype = Node.prototype;
// @ts-ignore
first_child_getter = get_descriptor(node_prototype, 'firstChild').get;
// @ts-ignore
next_sibling_getter = get_descriptor(node_prototype, 'nextSibling').get;
// the following assignments improve perf of lookups on DOM nodes
// @ts-expect-error
element_prototype.__click = undefined;
// @ts-expect-error
element_prototype.__className = '';
// @ts-expect-error
element_prototype.__attributes = null;
// @ts-expect-error
element_prototype.__e = undefined;
// @ts-expect-error
Text.prototype.__t = undefined;
if (DEV) {
// @ts-expect-error
element_prototype.__svelte_meta = null;
init_array_prototype_warnings();
}
}
/**
* @param {string} value
* @returns {Text}
*/
export function create_text(value = '') {
return document.createTextNode(value);
}
/**
* @template {Node} N
* @param {N} node
* @returns {Node | null}
*/
/*@__NO_SIDE_EFFECTS__*/
export function get_first_child(node) {
return first_child_getter.call(node);
}
/**
* @template {Node} N
* @param {N} node
* @returns {Node | null}
*/
/*@__NO_SIDE_EFFECTS__*/
export function get_next_sibling(node) {
return next_sibling_getter.call(node);
}
/**
* Don't mark this as side-effect-free, hydration needs to walk all nodes
* @template {Node} N
* @param {N} node
* @returns {Node | null}
*/
export function child(node) {
if (!hydrating) {
return get_first_child(node);
}
var child = /** @type {TemplateNode} */ (get_first_child(hydrate_node));
// Child can be null if we have an element with a single child, like `<p>{text}</p>`, where `text` is empty
if (child === null) {
child = hydrate_node.appendChild(create_text());
}
set_hydrate_node(child);
return child;
}
/**
* Don't mark this as side-effect-free, hydration needs to walk all nodes
* @param {DocumentFragment | TemplateNode[]} fragment
* @param {boolean} is_text
* @returns {Node | null}
*/
export function first_child(fragment, is_text) {
if (!hydrating) {
// when not hydrating, `fragment` is a `DocumentFragment` (the result of calling `open_frag`)
var first = /** @type {DocumentFragment} */ (get_first_child(/** @type {Node} */ (fragment)));
// TODO prevent user comments with the empty string when preserveComments is true
if (first instanceof Comment && first.data === '') return get_next_sibling(first);
return first;
}
// if an {expression} is empty during SSR, there might be no
// text node to hydrate — we must therefore create one
if (is_text && hydrate_node?.nodeType !== 3) {
var text = create_text();
hydrate_node?.before(text);
set_hydrate_node(text);
return text;
}
return hydrate_node;
}
/**
* Don't mark this as side-effect-free, hydration needs to walk all nodes
* @param {TemplateNode} node
* @param {number} count
* @param {boolean} is_text
* @returns {Node | null}
*/
export function sibling(node, count = 1, is_text = false) {
let next_sibling = hydrating ? hydrate_node : node;
while (count--) {
next_sibling = /** @type {TemplateNode} */ (get_next_sibling(next_sibling));
}
if (!hydrating) {
return next_sibling;
}
var type = next_sibling.nodeType;
// if a sibling {expression} is empty during SSR, there might be no
// text node to hydrate — we must therefore create one
if (is_text && type !== 3) {
var text = create_text();
next_sibling?.before(text);
set_hydrate_node(text);
return text;
}
set_hydrate_node(next_sibling);
return /** @type {TemplateNode} */ (next_sibling);
}
/**
* @template {Node} N
* @param {N} node
* @returns {void}
*/
export function clear_text_content(node) {
node.textContent = '';
}
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