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import { HYDRATION_END, HYDRATION_START, HYDRATION_ERROR } from '../../../constants.js';
import * as w from '../warnings.js';
/**
* Use this variable to guard everything related to hydration code so it can be treeshaken out
* if the user doesn't use the `hydrate` method and these code paths are therefore not needed.
*/
export let hydrating = false;
/** @param {boolean} value */
export function set_hydrating(value) {
hydrating = value;
}
/**
* Array of nodes to traverse for hydration. This will be null if we're not hydrating, but for
* the sake of simplicity we're not going to use `null` checks everywhere and instead rely on
* the `hydrating` flag to tell whether or not we're in hydration mode at which point this is set.
* @type {import('#client').TemplateNode[]}
*/
export let hydrate_nodes = /** @type {any} */ (null);
/** @type {import('#client').TemplateNode} */
export let hydrate_start;
/** @param {import('#client').TemplateNode[]} nodes */
export function set_hydrate_nodes(nodes) {
hydrate_nodes = nodes;
hydrate_start = nodes && nodes[0];
}
/**
* When assigning nodes to an effect during hydration, we typically want the hydration boundary comment node
* immediately before `hydrate_start`. In some cases, this comment doesn't exist because we optimized it away.
* TODO it might be worth storing this value separately rather than retrieving it with `previousSibling`
*/
export function get_start() {
return /** @type {import('#client').TemplateNode} */ (
hydrate_start.previousSibling ?? hydrate_start
);
}
/**
* This function is only called when `hydrating` is true. If passed a `<!--[-->` opening
* hydration marker, it finds the corresponding closing marker and sets `hydrate_nodes`
* to everything between the markers, before returning the closing marker.
* @param {Node} node
* @returns {Node}
*/
export function hydrate_anchor(node) {
if (node.nodeType !== 8) {
return node;
}
var current = /** @type {Node | null} */ (node);
// TODO this could have false positives, if a user comment consisted of `[`. need to tighten that up
if (/** @type {Comment} */ (current).data !== HYDRATION_START) {
return node;
}
/** @type {Node[]} */
var nodes = [];
var depth = 0;
while ((current = /** @type {Node} */ (current).nextSibling) !== null) {
if (current.nodeType === 8) {
var data = /** @type {Comment} */ (current).data;
if (data === HYDRATION_START) {
depth += 1;
} else if (data[0] === HYDRATION_END) {
if (depth === 0) {
hydrate_nodes = /** @type {import('#client').TemplateNode[]} */ (nodes);
hydrate_start = /** @type {import('#client').TemplateNode} */ (nodes[0]);
return current;
}
depth -= 1;
}
}
nodes.push(current);
}
let location;
if (DEV) {
// @ts-expect-error
const loc = node.parentNode?.__svelte_meta?.loc;
if (loc) {
location = `${loc.file}:${loc.line}:${loc.column}`;
}
}
w.hydration_mismatch(location);
throw HYDRATION_ERROR;
}
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