Press n or j to go to the next uncovered block, b, p or k for the previous block.
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import { hydrating, set_hydrate_nodes } from '../hydration.js';
import { empty } from '../operations.js';
import {
block,
branch,
destroy_effect,
pause_effect,
resume_effect
} from '../../reactivity/effects.js';
import { set_should_intro } from '../../render.js';
import { current_each_item, set_current_each_item } from './each.js';
import { current_component_context, current_effect } from '../../runtime.js';
import { DEV } from 'esm-env';
import { is_array } from '../../utils.js';
import { push_template_node } from '../template.js';
/**
* @param {import('#client').Effect} effect
* @param {Element} from
* @param {Element} to
* @returns {void}
*/
function swap_block_dom(effect, from, to) {
const dom = effect.dom;
if (is_array(dom)) {
for (let i = 0; i < dom.length; i++) {
if (dom[i] === from) {
dom[i] = to;
break;
}
}
} else if (dom === from) {
effect.dom = to;
}
}
/**
* @param {Comment | Element} node
* @param {() => string} get_tag
* @param {boolean} is_svg
* @param {undefined | ((element: Element, anchor: Node | null) => void)} render_fn,
* @param {undefined | (() => string)} get_namespace
* @param {undefined | [number, number]} location
* @returns {void}
*/
export function element(node, get_tag, is_svg, render_fn, get_namespace, location) {
const parent_effect = /** @type {import('#client').Effect} */ (current_effect);
const filename = DEV && location && current_component_context?.function.filename;
/** @type {string | null} */
let tag;
/** @type {string | null} */
let current_tag;
/** @type {null | Element} */
let element = hydrating && node.nodeType === 1 ? /** @type {Element} */ (node) : null;
let anchor = /** @type {Comment} */ (hydrating && element ? element.nextSibling : node);
/** @type {import('#client').Effect | null} */
let effect;
/**
* The keyed `{#each ...}` item block, if any, that this element is inside.
* We track this so we can set it when changing the element, allowing any
* `animate:` directive to bind itself to the correct block
*/
let each_item_block = current_each_item;
block(() => {
const next_tag = get_tag() || null;
const ns = get_namespace
? get_namespace()
: is_svg || next_tag === 'svg'
? namespace_svg
: null;
// Assumption: Noone changes the namespace but not the tag (what would that even mean?)
if (next_tag === tag) return;
// See explanation of `each_item_block` above
var previous_each_item = current_each_item;
set_current_each_item(each_item_block);
if (effect) {
if (next_tag === null) {
// start outro
pause_effect(effect, () => {
effect = null;
current_tag = null;
element?.remove();
});
} else if (next_tag === current_tag) {
// same tag as is currently rendered — abort outro
resume_effect(effect);
} else {
// tag is changing — destroy immediately, render contents without intro transitions
destroy_effect(effect);
set_should_intro(false);
}
}
if (next_tag && next_tag !== current_tag) {
effect = branch(() => {
const prev_element = element;
element = hydrating
? /** @type {Element} */ (element)
: ns
? document.createElementNS(ns, next_tag)
: document.createElement(next_tag);
if (DEV && location) {
// @ts-expect-error
element.__svelte_meta = {
loc: {
file: filename,
line: location[0],
column: location[1]
}
};
}
if (render_fn) {
// If hydrating, use the existing ssr comment as the anchor so that the
// inner open and close methods can pick up the existing nodes correctly
var child_anchor = hydrating ? element.lastChild : element.appendChild(empty());
if (hydrating && element.lastChild) {
set_hydrate_nodes(
/** @type {import('#client').TemplateNode[]} */ ([...element.childNodes]).slice(0, -1)
);
}
// `child_anchor` is undefined if this is a void element, but we still
// need to call `render_fn` in order to run actions etc. If the element
// contains children, it's a user error (which is warned on elsewhere)
// and the DOM will be silently discarded
render_fn(element, child_anchor);
}
anchor.before(element);
if (prev_element) {
swap_block_dom(parent_effect, prev_element, element);
prev_element.remove();
} else if (!hydrating) {
push_template_node(element, parent_effect);
}
});
}
tag = next_tag;
if (tag) current_tag = tag;
set_should_intro(true);
set_current_each_item(previous_each_item);
});
}
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