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import { empty } from './operations.js';
import { create_fragment_from_html } from './reconciler.js';
import { current_effect } from '../runtime.js';
import { TEMPLATE_FRAGMENT, TEMPLATE_USE_IMPORT_NODE } from '../../../constants.js';
import { is_array } from '../utils.js';
import { queue_micro_task } from './task.js';
/**
* @template {import("#client").TemplateNode | import("#client").TemplateNode[]} T
* @param {T} dom
* @param {import("#client").Effect} effect
*/
export function push_template_node(
dom,
effect = /** @type {import('#client').Effect} */ (current_effect)
) {
var current_dom = effect.dom;
if (current_dom === null) {
effect.dom = dom;
} else {
if (!is_array(current_dom)) {
current_dom = effect.dom = [current_dom];
}
if (is_array(dom)) {
current_dom.push(...dom);
} else {
current_dom.push(dom);
}
}
return dom;
}
/**
* @param {string} content
* @param {number} flags
* @returns {() => Node | Node[]}
*/
/*#__NO_SIDE_EFFECTS__*/
export function template(content, flags) {
var is_fragment = (flags & TEMPLATE_FRAGMENT) !== 0;
var use_import_node = (flags & TEMPLATE_USE_IMPORT_NODE) !== 0;
/** @type {Node} */
var node;
return () => {
if (hydrating) {
push_template_node(is_fragment ? hydrate_nodes : hydrate_start);
return hydrate_start;
}
if (!node) {
node = create_fragment_from_html(content);
if (!is_fragment) node = /** @type {Node} */ (node.firstChild);
}
var clone = use_import_node ? document.importNode(node, true) : node.cloneNode(true);
push_template_node(
is_fragment
? /** @type {import('#client').TemplateNode[]} */ ([...clone.childNodes])
: /** @type {import('#client').TemplateNode} */ (clone)
);
return clone;
};
}
/**
* @param {string} content
* @param {number} flags
* @returns {() => Node | Node[]}
*/
/*#__NO_SIDE_EFFECTS__*/
export function template_with_script(content, flags) {
var first = true;
var fn = template(content, flags);
return () => {
if (hydrating) return fn();
var node = /** @type {Element | DocumentFragment} */ (fn());
if (first) {
first = false;
run_scripts(node);
}
return node;
};
}
/**
* @param {string} content
* @param {number} flags
* @param {'svg' | 'math'} ns
* @returns {() => Node | Node[]}
*/
/*#__NO_SIDE_EFFECTS__*/
export function ns_template(content, flags, ns = 'svg') {
var is_fragment = (flags & TEMPLATE_FRAGMENT) !== 0;
var fn = template(`<${ns}>${content}</${ns}>`, 0); // we don't need to worry about using importNode for namespaced elements
/** @type {Element | DocumentFragment} */
var node;
return () => {
if (hydrating) {
push_template_node(is_fragment ? hydrate_nodes : hydrate_start);
return hydrate_start;
}
if (!node) {
var wrapper = /** @type {Element} */ (fn());
if ((flags & TEMPLATE_FRAGMENT) === 0) {
node = /** @type {Element} */ (wrapper.firstChild);
} else {
node = document.createDocumentFragment();
while (wrapper.firstChild) {
node.appendChild(wrapper.firstChild);
}
}
}
var clone = node.cloneNode(true);
push_template_node(
is_fragment
? /** @type {import('#client').TemplateNode[]} */ ([...clone.childNodes])
: /** @type {import('#client').TemplateNode} */ (clone)
);
return clone;
};
}
/**
* @param {string} content
* @param {number} flags
* @returns {() => Node | Node[]}
*/
/*#__NO_SIDE_EFFECTS__*/
export function svg_template_with_script(content, flags) {
var first = true;
var fn = ns_template(content, flags);
return () => {
if (hydrating) return fn();
var node = /** @type {Element | DocumentFragment} */ (fn());
if (first) {
first = false;
run_scripts(node);
}
return node;
};
}
/**
* @param {string} content
* @param {number} flags
* @returns {() => Node | Node[]}
*/
/*#__NO_SIDE_EFFECTS__*/
export function mathml_template(content, flags) {
return ns_template(content, flags, 'math');
}
/**
* Creating a document fragment from HTML that contains script tags will not execute
* the scripts. We need to replace the script tags with new ones so that they are executed.
* @param {Element | DocumentFragment} node
*/
function run_scripts(node) {
// scripts were SSR'd, in which case they will run
if (hydrating) return;
const scripts =
/** @type {HTMLElement} */ (node).tagName === 'SCRIPT'
? [/** @type {HTMLScriptElement} */ (node)]
: node.querySelectorAll('script');
for (const script of scripts) {
var clone = document.createElement('script');
for (var attribute of script.attributes) {
clone.setAttribute(attribute.name, attribute.value);
}
clone.textContent = script.textContent;
// If node === script tag, replaceWith will do nothing because there's no parent yet,
// waiting until that's the case using an effect solves this.
// Don't do it in other circumstances or we could accidentally execute scripts
// in an adjacent @html tag that was instantiated in the meantime.
if (script === node) {
queue_micro_task(() => script.replaceWith(clone));
} else {
script.replaceWith(clone);
}
}
}
/**
* @param {Text | Comment | Element} anchor
*/
/*#__NO_SIDE_EFFECTS__*/
export function text(anchor) {
if (!hydrating) return push_template_node(empty());
var node = hydrate_start;
if (!node) {
// if an {expression} is empty during SSR, `hydrate_nodes` will be empty.
// we need to insert an empty text node
anchor.before((node = empty()));
}
push_template_node(node);
return node;
}
export function comment() {
// we're not delegating to `template` here for performance reasons
if (hydrating) {
push_template_node(hydrate_nodes);
return hydrate_start;
}
var frag = document.createDocumentFragment();
var anchor = empty();
frag.append(anchor);
push_template_node([anchor]);
return frag;
}
/**
* Assign the created (or in hydration mode, traversed) dom elements to the current block
* and insert the elements into the dom (in client mode).
* @param {Text | Comment | Element} anchor
* @param {DocumentFragment | Element} dom
*/
export function append(anchor, dom) {
if (hydrating) return;
// We intentionally do not assign the `dom` property of the effect here because it's far too
// late. If we try, we will capture additional DOM elements that we cannot control the lifecycle
// for and will inevitably cause memory leaks. See https://github.com/sveltejs/svelte/pull/11832
anchor.before(/** @type {Node} */ (dom));
}
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