svelte/src/internal/server/payload.js

Cybernetically enhanced web apps

export class HeadPayload {
	/** @type {Set<{ hash: string; code: string }>} */
	css = new Set();
	/** @type {string[]} */
	out = [];
	uid = () => '';
	title = '';

	constructor(css = new Set(), /** @type {string[]} */ out = [], title = '', uid = () => '') {
		this.css = css;
		this.out = out;
		this.title = title;
		this.uid = uid;
	}
}

export class Payload {
	/** @type {Set<{ hash: string; code: string }>} */
	css = new Set();
	/** @type {string[]} */
	out = [];
	uid = () => '';
	select_value = undefined;

	head = new HeadPayload();

	constructor(id_prefix = '') {
		this.uid = props_id_generator(id_prefix);
		this.head.uid = this.uid;
	}
}

/**
 * Used in legacy mode to handle bindings
 * @param {Payload} to_copy
 * @returns {Payload}
 */
export function copy_payload({ out, css, head, uid }) {
	const payload = new Payload();

	payload.out = [...out];
	payload.css = new Set(css);
	payload.uid = uid;

	payload.head = new HeadPayload();
	payload.head.out = [...head.out];
	payload.head.css = new Set(head.css);
	payload.head.title = head.title;
	payload.head.uid = head.uid;

	return payload;
}

/**
 * Assigns second payload to first
 * @param {Payload} p1
 * @param {Payload} p2
 * @returns {void}
 */
export function assign_payload(p1, p2) {
	p1.out = [...p2.out];
	p1.css = p2.css;
	p1.head = p2.head;
	p1.uid = p2.uid;
}

/**
 * Creates an ID generator
 * @param {string} prefix
 * @returns {() => string}
 */
function props_id_generator(prefix) {
	let uid = 1;
	return () => `${prefix}s${uid++}`;
}