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/** @import { Component, Payload, RenderOutput } from '#server' */
/** @import { Store } from '#shared' */
export { FILENAME, HMR } from '../../constants.js';
import { is_promise, noop } from '../shared/utils.js';
import { subscribe_to_store } from '../../store/utils.js';
import {
UNINITIALIZED,
ELEMENT_PRESERVE_ATTRIBUTE_CASE,
ELEMENT_IS_NAMESPACED
} from '../../constants.js';
import { escape_html } from '../../escaping.js';
import { DEV } from 'esm-env';
import { current_component, pop, push } from './context.js';
import { EMPTY_COMMENT, BLOCK_CLOSE, BLOCK_OPEN } from './hydration.js';
import { validate_store } from '../shared/validate.js';
import { is_boolean_attribute, is_void } from '../../utils.js';
// https://html.spec.whatwg.org/multipage/syntax.html#attributes-2
// https://infra.spec.whatwg.org/#noncharacter
const INVALID_ATTR_NAME_CHAR_REGEX =
/[\s'">/=\u{FDD0}-\u{FDEF}\u{FFFE}\u{FFFF}\u{1FFFE}\u{1FFFF}\u{2FFFE}\u{2FFFF}\u{3FFFE}\u{3FFFF}\u{4FFFE}\u{4FFFF}\u{5FFFE}\u{5FFFF}\u{6FFFE}\u{6FFFF}\u{7FFFE}\u{7FFFF}\u{8FFFE}\u{8FFFF}\u{9FFFE}\u{9FFFF}\u{AFFFE}\u{AFFFF}\u{BFFFE}\u{BFFFF}\u{CFFFE}\u{CFFFF}\u{DFFFE}\u{DFFFF}\u{EFFFE}\u{EFFFF}\u{FFFFE}\u{FFFFF}\u{10FFFE}\u{10FFFF}]/u;
/** List of elements that require raw contents and should not have SSR comments put in them */
const RAW_TEXT_ELEMENTS = ['textarea', 'script', 'style', 'title'];
/**
* @param {Payload} to_copy
* @returns {Payload}
*/
export function copy_payload({ out, css, head }) {
return {
out,
css: new Set(css),
head: {
title: head.title,
out: head.out
}
};
}
/**
* Assigns second payload to first
* @param {Payload} p1
* @param {Payload} p2
* @returns {void}
*/
export function assign_payload(p1, p2) {
p1.out = p2.out;
p1.head = p2.head;
}
/**
* @param {Payload} payload
* @param {string} tag
* @param {() => void} attributes_fn
* @param {() => void} children_fn
* @returns {void}
*/
export function element(payload, tag, attributes_fn = noop, children_fn = noop) {
payload.out += '<!---->';
if (tag) {
payload.out += `<${tag} `;
attributes_fn();
payload.out += `>`;
if (!is_void(tag)) {
children_fn();
if (!RAW_TEXT_ELEMENTS.includes(tag)) {
payload.out += EMPTY_COMMENT;
}
payload.out += `</${tag}>`;
}
}
payload.out += '<!---->';
}
/**
* Array of `onDestroy` callbacks that should be called at the end of the server render function
* @type {Function[]}
*/
export let on_destroy = [];
/**
* Only available on the server and when compiling with the `server` option.
* Takes a component and returns an object with `body` and `head` properties on it, which you can use to populate the HTML when server-rendering your app.
* @template {Record<string, any>} Props
* @param {import('svelte').Component<Props> | ComponentType<SvelteComponent<Props>>} component
* @param {{ props?: Omit<Props, '$$slots' | '$$events'>; context?: Map<any, any> }} [options]
* @returns {RenderOutput}
*/
export function render(component, options = {}) {
/** @type {Payload} */
const payload = { out: '', css: new Set(), head: { title: '', out: '' } };
const prev_on_destroy = on_destroy;
on_destroy = [];
payload.out += BLOCK_OPEN;
if (options.context) {
push();
/** @type {Component} */ (current_component).c = options.context;
}
// @ts-expect-error
component(payload, options.props ?? {}, {}, {});
if (options.context) {
pop();
}
payload.out += BLOCK_CLOSE;
for (const cleanup of on_destroy) cleanup();
on_destroy = prev_on_destroy;
let head = payload.head.out + payload.head.title;
for (const { hash, code } of payload.css) {
head += `<style id="${hash}">${code}</style>`;
}
return {
head,
html: payload.out,
body: payload.out
};
}
/**
* @param {Payload} payload
* @param {(head_payload: Payload['head']) => void} fn
* @returns {void}
*/
export function head(payload, fn) {
const head_payload = payload.head;
head_payload.out += BLOCK_OPEN;
fn(head_payload);
head_payload.out += BLOCK_CLOSE;
}
/**
* @template V
* @param {string} name
* @param {V} value
* @param {boolean} [is_boolean]
* @returns {string}
*/
export function attr(name, value, is_boolean = false) {
if (value == null || (!value && is_boolean) || (value === '' && name === 'class')) return '';
const assignment = is_boolean ? '' : `="${escape_html(value, true)}"`;
return ` ${name}${assignment}`;
}
/**
* @param {Payload} payload
* @param {boolean} is_html
* @param {Record<string, string>} props
* @param {() => void} component
* @param {boolean} dynamic
* @returns {void}
*/
export function css_props(payload, is_html, props, component, dynamic = false) {
const styles = style_object_to_string(props);
if (is_html) {
payload.out += `<div style="display: contents; ${styles}">`;
} else {
payload.out += `<g style="${styles}">`;
}
if (dynamic) {
payload.out += '<!---->';
}
component();
if (is_html) {
payload.out += `<!----></div>`;
} else {
payload.out += `<!----></g>`;
}
}
/**
* @param {Record<string, unknown>} attrs
* @param {Record<string, string>} [classes]
* @param {Record<string, string>} [styles]
* @param {number} [flags]
* @returns {string}
*/
export function spread_attributes(attrs, classes, styles, flags = 0) {
if (styles) {
attrs.style = attrs.style
? style_object_to_string(merge_styles(/** @type {string} */ (attrs.style), styles))
: style_object_to_string(styles);
}
if (classes) {
const classlist = attrs.class ? [attrs.class] : [];
for (const key in classes) {
if (classes[key]) {
classlist.push(key);
}
}
attrs.class = classlist.join(' ');
}
let attr_str = '';
let name;
const is_html = (flags & ELEMENT_IS_NAMESPACED) === 0;
const lowercase = (flags & ELEMENT_PRESERVE_ATTRIBUTE_CASE) === 0;
for (name in attrs) {
// omit functions, internal svelte properties and invalid attribute names
if (typeof attrs[name] === 'function') continue;
if (name[0] === '$' && name[1] === '$') continue; // faster than name.startsWith('$$')
if (INVALID_ATTR_NAME_CHAR_REGEX.test(name)) continue;
if (lowercase) {
name = name.toLowerCase();
}
attr_str += attr(name, attrs[name], is_html && is_boolean_attribute(name));
}
return attr_str;
}
/**
* @param {Record<string, unknown>[]} props
* @returns {Record<string, unknown>}
*/
export function spread_props(props) {
/** @type {Record<string, unknown>} */
const merged_props = {};
let key;
for (let i = 0; i < props.length; i++) {
const obj = props[i];
for (key in obj) {
merged_props[key] = obj[key];
}
}
return merged_props;
}
/**
* @param {unknown} value
* @returns {string}
*/
export function stringify(value) {
return typeof value === 'string' ? value : value == null ? '' : value + '';
}
/** @param {Record<string, string>} style_object */
function style_object_to_string(style_object) {
return Object.keys(style_object)
.filter(/** @param {any} key */ (key) => style_object[key] != null && style_object[key] !== '')
.map(/** @param {any} key */ (key) => `${key}: ${escape_html(style_object[key], true)};`)
.join(' ');
}
/** @param {Record<string, string>} style_object */
export function add_styles(style_object) {
const styles = style_object_to_string(style_object);
return styles ? ` style="${styles}"` : '';
}
/**
* @param {string} attribute
* @param {Record<string, string>} styles
*/
export function merge_styles(attribute, styles) {
/** @type {Record<string, string>} */
var merged = {};
if (attribute) {
for (var declaration of attribute.split(';')) {
var i = declaration.indexOf(':');
var name = declaration.slice(0, i).trim();
var value = declaration.slice(i + 1).trim();
if (name !== '') merged[name] = value;
}
}
for (name in styles) {
merged[name] = styles[name];
}
return merged;
}
/**
* @template V
* @param {Record<string, [any, any, any]>} store_values
* @param {string} store_name
* @param {Store<V> | null | undefined} store
* @returns {V}
*/
export function store_get(store_values, store_name, store) {
if (DEV) {
validate_store(store, store_name.slice(1));
}
// it could be that someone eagerly updates the store in the instance script, so
// we should only reuse the store value in the template
if (store_name in store_values && store_values[store_name][0] === store) {
return store_values[store_name][2];
}
store_values[store_name]?.[1](); // if store was switched, unsubscribe from old store
store_values[store_name] = [store, null, undefined];
const unsub = subscribe_to_store(
store,
/** @param {any} v */ (v) => (store_values[store_name][2] = v)
);
store_values[store_name][1] = unsub;
return store_values[store_name][2];
}
/**
* Sets the new value of a store and returns that value.
* @template V
* @param {Store<V>} store
* @param {V} value
* @returns {V}
*/
export function store_set(store, value) {
store.set(value);
return value;
}
/**
* Updates a store with a new value.
* @template V
* @param {Record<string, [any, any, any]>} store_values
* @param {string} store_name
* @param {Store<V>} store
* @param {any} expression
*/
export function store_mutate(store_values, store_name, store, expression) {
store_set(store, store_get(store_values, store_name, store));
return expression;
}
/**
* @param {Record<string, [any, any, any]>} store_values
* @param {string} store_name
* @param {Store<number>} store
* @param {1 | -1} [d]
* @returns {number}
*/
export function update_store(store_values, store_name, store, d = 1) {
let store_value = store_get(store_values, store_name, store);
store.set(store_value + d);
return store_value;
}
/**
* @param {Record<string, [any, any, any]>} store_values
* @param {string} store_name
* @param {Store<number>} store
* @param {1 | -1} [d]
* @returns {number}
*/
export function update_store_pre(store_values, store_name, store, d = 1) {
const value = store_get(store_values, store_name, store) + d;
store.set(value);
return value;
}
/** @param {Record<string, [any, any, any]>} store_values */
export function unsubscribe_stores(store_values) {
for (const store_name in store_values) {
store_values[store_name][1]();
}
}
/**
* @template V
* @param {V} value
* @param {() => V} fallback lazy because could contain side effects
* @returns {V}
*/
export function value_or_fallback(value, fallback) {
return value === undefined ? fallback() : value;
}
/**
* @template V
* @param {V} value
* @param {() => Promise<V>} fallback lazy because could contain side effects
* @returns {Promise<V>}
*/
export async function value_or_fallback_async(value, fallback) {
return value === undefined ? fallback() : value;
}
/**
* @param {Payload} payload
* @param {void | ((payload: Payload, props: Record<string, unknown>) => void)} slot_fn
* @param {Record<string, unknown>} slot_props
* @param {null | (() => void)} fallback_fn
* @returns {void}
*/
export function slot(payload, slot_fn, slot_props, fallback_fn) {
if (slot_fn !== undefined) {
slot_fn(payload, slot_props);
} else {
fallback_fn?.();
}
}
/**
* @param {Record<string, unknown>} props
* @param {string[]} rest
* @returns {Record<string, unknown>}
*/
export function rest_props(props, rest) {
/** @type {Record<string, unknown>} */
const rest_props = {};
let key;
for (key in props) {
if (!rest.includes(key)) {
rest_props[key] = props[key];
}
}
return rest_props;
}
/**
* @param {Record<string, unknown>} props
* @returns {Record<string, unknown>}
*/
export function sanitize_props(props) {
const { children, $$slots, ...sanitized } = props;
return sanitized;
}
/**
* @param {Record<string, any>} props
* @returns {Record<string, boolean>}
*/
export function sanitize_slots(props) {
/** @type {Record<string, boolean>} */
const sanitized = {};
if (props.children) sanitized.default = true;
for (const key in props.$$slots) {
sanitized[key] = true;
}
return sanitized;
}
/**
* Legacy mode: If the prop has a fallback and is bound in the
* parent component, propagate the fallback value upwards.
* @param {Record<string, unknown>} props_parent
* @param {Record<string, unknown>} props_now
*/
export function bind_props(props_parent, props_now) {
for (const key in props_now) {
const initial_value = props_parent[key];
const value = props_now[key];
if (
initial_value === undefined &&
value !== undefined &&
Object.getOwnPropertyDescriptor(props_parent, key)?.set
) {
props_parent[key] = value;
}
}
}
/**
* @template V
* @param {Promise<V>} promise
* @param {null | (() => void)} pending_fn
* @param {(value: V) => void} then_fn
* @returns {void}
*/
function await_block(promise, pending_fn, then_fn) {
if (is_promise(promise)) {
promise.then(null, noop);
if (pending_fn !== null) {
pending_fn();
}
} else if (then_fn !== null) {
then_fn(promise);
}
}
export { await_block as await };
/** @param {any} array_like_or_iterator */
export function ensure_array_like(array_like_or_iterator) {
return array_like_or_iterator?.length !== undefined
? array_like_or_iterator
: Array.from(array_like_or_iterator);
}
/**
* @param {any[]} args
* @param {Function} [inspect]
*/
// eslint-disable-next-line no-console
export function inspect(args, inspect = console.log) {
inspect('init', ...args);
}
/**
* @template V
* @param {() => V} get_value
*/
export function once(get_value) {
let value = /** @type {V} */ (UNINITIALIZED);
return () => {
if (value === UNINITIALIZED) {
value = get_value();
}
return value;
};
}
export { html } from './blocks/html.js';
export { push, pop } from './context.js';
export { push_element, pop_element } from './dev.js';
export { snapshot } from '../shared/clone.js';
export {
invalid_default_snippet,
validate_dynamic_element_tag,
validate_void_dynamic_element
} from '../shared/validate.js';
export { escape_html as escape };
export { default_slot } from '../client/dom/legacy/misc.js';
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