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import { hydrating } from '../hydration.js';
import { get_descriptors, get_prototype_of, map_get, map_set } from '../../utils.js';
import { AttributeAliases, DelegatedEvents, namespace_svg } from '../../../../constants.js';
import { delegate } from './events.js';
import { autofocus } from './misc.js';
import { effect, effect_root } from '../../reactivity/effects.js';
import * as w from '../../warnings.js';
/**
* The value/checked attribute in the template actually corresponds to the defaultValue property, so we need
* to remove it upon hydration to avoid a bug when someone resets the form value.
* @param {HTMLInputElement | HTMLSelectElement} dom
* @returns {void}
*/
export function remove_input_attr_defaults(dom) {
if (hydrating) {
// using getAttribute instead of dom.value allows us to have
// null instead of "on" if the user didn't set a value
const value = dom.getAttribute('value');
set_attribute(dom, 'value', null);
set_attribute(dom, 'checked', null);
if (value) dom.value = value;
}
}
/**
* @param {Element} element
* @param {string} attribute
* @param {string | null} value
*/
export function set_attribute(element, attribute, value) {
value = value == null ? null : value + '';
// @ts-expect-error
var attributes = (element.__attributes ??= {});
if (hydrating) {
attributes[attribute] = element.getAttribute(attribute);
if (attribute === 'src' || attribute === 'href' || attribute === 'srcset') {
check_src_in_dev_hydration(element, attribute, value);
// If we reset these attributes, they would result in another network request, which we want to avoid.
// We assume they are the same between client and server as checking if they are equal is expensive
// (we can't just compare the strings as they can be different between client and server but result in the
// same url, so we would need to create hidden anchor elements to compare them)
return;
}
}
if (attributes[attribute] === (attributes[attribute] = value)) return;
if (value === null) {
element.removeAttribute(attribute);
} else {
element.setAttribute(attribute, value);
}
}
/**
* @param {Element} dom
* @param {string} attribute
* @param {string} value
*/
export function set_xlink_attribute(dom, attribute, value) {
dom.setAttributeNS('http://www.w3.org/1999/xlink', attribute, value);
}
/**
* @param {any} node
* @param {string} prop
* @param {any} value
*/
export function set_custom_element_data(node, prop, value) {
if (prop in node) {
var curr_val = node[prop];
var next_val = typeof curr_val === 'boolean' && value === '' ? true : value;
if (typeof curr_val !== 'object' || curr_val !== next_val) {
node[prop] = next_val;
}
} else {
set_attribute(node, prop, value);
}
}
/**
* Spreads attributes onto a DOM element, taking into account the currently set attributes
* @param {Element & ElementCSSInlineStyle} element
* @param {Record<string, any> | undefined} prev
* @param {Record<string, any>} next New attributes - this function mutates this object
* @param {boolean} lowercase_attributes
* @param {string} css_hash
* @returns {Record<string, any>}
*/
export function set_attributes(element, prev, next, lowercase_attributes, css_hash) {
var has_hash = css_hash.length !== 0;
for (var key in prev) {
if (!(key in next)) {
next[key] = null;
}
}
if (has_hash && !next.class) {
next.class = '';
}
var setters = map_get(setters_cache, element.nodeName);
if (!setters) map_set(setters_cache, element.nodeName, (setters = get_setters(element)));
// @ts-expect-error
var attributes = /** @type {Record<string, unknown>} **/ (element.__attributes ??= {});
/** @type {Array<[string, any, () => void]>} */
var events = [];
for (key in next) {
// let instead of var because referenced in a closure
let value = next[key];
if (value === prev?.[key]) continue;
var prefix = key[0] + key[1]; // this is faster than key.slice(0, 2)
if (prefix === '$$') continue;
if (prefix === 'on') {
/** @type {{ capture?: true }} */
const opts = {};
let event_name = key.slice(2);
var delegated = DelegatedEvents.includes(event_name);
if (
event_name.endsWith('capture') &&
event_name !== 'ongotpointercapture' &&
event_name !== 'onlostpointercapture'
) {
event_name = event_name.slice(0, -7);
opts.capture = true;
}
if (!delegated && prev?.[key]) {
element.removeEventListener(event_name, /** @type {any} */ (prev[key]), opts);
}
if (value != null) {
if (!delegated) {
if (!prev) {
events.push([key, value, () => element.addEventListener(event_name, value, opts)]);
} else {
element.addEventListener(event_name, value, opts);
}
} else {
// @ts-ignore
element[`__${event_name}`] = value;
delegate([event_name]);
}
}
} else if (value == null) {
attributes[key] = null;
element.removeAttribute(key);
} else if (key === 'style') {
element.style.cssText = value + '';
} else if (key === 'autofocus') {
autofocus(/** @type {HTMLElement} */ (element), Boolean(value));
} else if (key === '__value' || key === 'value') {
// @ts-ignore
element.value = element[key] = element.__value = value;
} else {
var name = key;
if (lowercase_attributes) {
name = name.toLowerCase();
name = AttributeAliases[name] || name;
}
if (setters.includes(name)) {
if (hydrating && (name === 'src' || name === 'href' || name === 'srcset')) {
check_src_in_dev_hydration(element, name, value);
} else {
// @ts-ignore
element[name] = value;
}
} else if (typeof value !== 'function') {
if (has_hash && name === 'class') {
if (value) value += ' ';
value += css_hash;
}
set_attribute(element, name, value);
}
}
}
// On the first run, ensure that events are added after bindings so
// that their listeners fire after the binding listeners
if (!prev) {
// In edge cases it may happen that set_attributes is re-run before the
// effect is executed. In that case the render effect which initiates this
// re-run will destroy the inner effect and it will never run. But because
// next and prev may have the same keys, the event would not get added again
// and it would get lost. We prevent this by using a root effect.
const destroy_root = effect_root(() => {
effect(() => {
if (!element.isConnected) return;
for (const [key, value, evt] of events) {
if (next[key] === value) {
evt();
}
}
destroy_root();
});
});
}
return next;
}
/**
* @param {Element} node
* @param {Record<string, any> | undefined} prev
* @param {Record<string, any>} next The new attributes - this function mutates this object
* @param {string} css_hash
*/
export function set_dynamic_element_attributes(node, prev, next, css_hash) {
if (node.tagName.includes('-')) {
for (var key in prev) {
if (!(key in next)) {
next[key] = null;
}
}
for (key in next) {
set_custom_element_data(node, key, next[key]);
}
return next;
}
return set_attributes(
/** @type {Element & ElementCSSInlineStyle} */ (node),
prev,
next,
node.namespaceURI !== namespace_svg,
css_hash
);
}
/**
* List of attributes that should always be set through the attr method,
* because updating them through the property setter doesn't work reliably.
* In the example of `width`/`height`, the problem is that the setter only
* accepts numeric values, but the attribute can also be set to a string like `50%`.
* If this list becomes too big, rethink this approach.
*/
var always_set_through_set_attribute = ['width', 'height'];
/** @type {Map<string, string[]>} */
var setters_cache = new Map();
/** @param {Element} element */
function get_setters(element) {
/** @type {string[]} */
var setters = [];
var descriptors;
var proto = get_prototype_of(element);
// Stop at Element, from there on there's only unnecessary setters we're not interested in
while (proto.constructor.name !== 'Element') {
descriptors = get_descriptors(proto);
for (var key in descriptors) {
if (descriptors[key].set && !always_set_through_set_attribute.includes(key)) {
setters.push(key);
}
}
proto = get_prototype_of(proto);
}
return setters;
}
/**
* @param {any} element
* @param {string} attribute
* @param {string | null} value
*/
function check_src_in_dev_hydration(element, attribute, value) {
if (!DEV) return;
if (attribute === 'srcset' && srcset_url_equal(element, value)) return;
if (src_url_equal(element.getAttribute(attribute) ?? '', value ?? '')) return;
w.hydration_attribute_changed(
attribute,
element.outerHTML.replace(element.innerHTML, '...'),
String(value)
);
}
/**
* @param {string} element_src
* @param {string} url
* @returns {boolean}
*/
function src_url_equal(element_src, url) {
if (element_src === url) return true;
return new URL(element_src, document.baseURI).href === new URL(url, document.baseURI).href;
}
/** @param {string} srcset */
function split_srcset(srcset) {
return srcset.split(',').map((src) => src.trim().split(' ').filter(Boolean));
}
/**
* @param {HTMLSourceElement | HTMLImageElement} element
* @param {string | undefined | null} srcset
* @returns {boolean}
*/
function srcset_url_equal(element, srcset) {
var element_urls = split_srcset(element.srcset);
var urls = split_srcset(srcset ?? '');
return (
urls.length === element_urls.length &&
urls.every(
([url, width], i) =>
width === element_urls[i][1] &&
// We need to test both ways because Vite will create an a full URL with
// `new URL(asset, import.meta.url).href` for the client when `base: './'`, and the
// relative URLs inside srcset are not automatically resolved to absolute URLs by
// browsers (in contrast to img.src). This means both SSR and DOM code could
// contain relative or absolute URLs.
(src_url_equal(element_urls[i][0], url) || src_url_equal(url, element_urls[i][0]))
)
);
}
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