All files / src/internal/client/dom operations.js

100% Statements 184/184
100% Branches 35/35
100% Functions 8/8
100% Lines 180/180

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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 1812x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 4883x 4879x 4879x 4x 4x 4x 4x 4x 4x 4x 4x 4x 4x 4x 4x 4x 4x 4x 4x 4x 4x 4x 4x 4x 4x 4x 4x 4x 4x 4x 4x 4x 4x 4x 4883x 2x 2x 2x 2x 2x 2x 5190x 5190x 2x 2x 2x 2x 2x 2x 2x 2x 13737x 13737x 2x 2x 2x 2x 2x 2x 2x 2x 37868x 37868x 2x 2x 2x 2x 2x 2x 2x 2x 7320x 4083x 4083x 3237x 3237x 3237x 3237x 7313x 42x 42x 3237x 3237x 3237x 3237x 2x 2x 2x 2x 2x 2x 2x 2x 3386x 1879x 1879x 1879x 1879x 1879x 742x 742x 742x 1507x 1507x 1507x 3386x 2x 2x 2x 2x 2x 2x 1505x 1505x 1505x 2x 2x 2x 2x 2x 2x 2x 2x 2x 3626x 3626x 3626x 6811x 6811x 3626x 3626x 1972x 1972x 1654x 1654x 1654x 1654x 1654x 3626x 2x 2x 2x 2x 2x 1652x 1652x 1652x 1652x 2x 2x 2x 2x 2x 2x 2x 14x 14x  
/** @import { TemplateNode } from '#client' */
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 = '';
}