All files / src/internal/client/dom/blocks svelte-element.js

97.75% Statements 174/178
92.5% Branches 37/40
100% Functions 2/2
97.61% Lines 164/168

Press n or j to go to the next uncovered block, b, p or k for the previous block.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 1692x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 66x 66x 66x 66x 66x 200x 65x 65x 65x 200x 66x     66x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 145x 145x 145x 145x 145x 145x 145x 145x 145x 145x 145x 145x 145x 145x 145x 145x 145x 145x 145x 145x 145x 145x 145x 145x 145x 221x 221x 221x 221x 217x 221x 221x 221x 221x 221x 221x 221x 221x 221x 70x 8x 8x 8x 8x 8x 8x 70x     62x 62x 62x 62x 62x 70x 221x 221x 207x 207x 207x 207x 207x 141x 207x 207x 207x 18x 18x 18x 18x 18x 18x 18x 18x 18x 207x 207x 187x 187x 187x 187x 187x 187x 187x 6x 6x 6x 6x 187x 187x 187x 187x 187x 187x 187x 207x 207x 207x 207x 66x 66x 207x 75x 75x 207x 207x 221x 221x 221x 221x 221x 221x 145x 145x 145x 145x 145x 145x 145x  
import { namespace_svg } from '../../../../constants.js';
import { hydrate_anchor, hydrate_nodes, hydrating, set_hydrate_nodes } from '../hydration.js';
import { empty } from '../operations.js';
import {
	block,
	branch,
	destroy_effect,
	pause_effect,
	render_effect,
	resume_effect
} from '../../reactivity/effects.js';
import { is_array } from '../../utils.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 { push_template_node } from '../template.js';
import { DEV } from 'esm-env';
 
/**
 * @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} anchor
 * @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(anchor, 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;
 
	render_effect(() => {
		/** @type {string | null} */
		let tag;
 
		/** @type {string | null} */
		let current_tag;
 
		/** @type {null | Element} */
		let element = null;
 
		/** @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} */ (hydrate_nodes[0])
						: ns
							? document.createElementNS(ns, next_tag)
							: document.createElement(next_tag);
 
					if (DEV && location) {
						// @ts-expect-error
						element.__svelte_meta = {
							loc: {
								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.firstChild && hydrate_anchor(/** @type {Comment} */ (element.firstChild))
							: element.appendChild(empty());
 
						if (hydrating && !element.firstChild) {
							// if the element is a void element with content, add an empty
							// node to avoid breaking assumptions elsewhere
							set_hydrate_nodes([empty()]);
						}
 
						// `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);
		});
 
		return () => {
			element?.remove();
		};
	});
}