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microjungle JsonML to DocumentFragment

Based on https://github.com/deepsweet/microjungle by Kir Belevich

Verzia zo dňa 08.01.2018. Pozri najnovšiu verziu.

Tento skript by nemal byť nainštalovaný priamo. Je to knižnica pre ďalšie skripty, ktorú by mali používať cez meta príkaz // @require https://updategreasyfork.deno.dev/scripts/25520/241821/microjungle%20JsonML%20to%20DocumentFragment.js 

// ==UserScript==
// @name        microjungle JsonML to DocumentFragment
// @description Based on https://github.com/deepsweet/microjungle by Kir Belevich
// @namespace   https://gf.zukizuki.org/en/users/447-spooky-donkey
// @ecmaVersion 6
// @version     3
// @grant       none
// ==/UserScript==

/*exported MicrojungleJsonMLtoDocumentFragment*/
const MicrojungleJsonMLtoDocumentFragment = function () {
	"use strict";
	return function frag(template, target = document.createDocumentFragment()) {
		if (!Array.isArray(template)) {
			return target;
		}
		const stringOrFinite = a => typeof a === "string" ||
			(typeof a === "number" && isFinite(a));
		function createElement(item, s = item[1]) {
			const elem = document.createElement(item.shift());
			if (!!s && s.constructor === Object) {
				const attrList = item.shift();
				Object.entries(attrList).forEach(([attrName, attrValue]) => {
					if (stringOrFinite(attrValue)) {
						elem.setAttribute(attrName, attrValue);
					}
				});
			}
			target.appendChild(frag(item, elem));
		}
		template.forEach(item => {
			if (stringOrFinite(item)) {
				target.appendChild(document.createTextNode(item));
			} else if (item) {
				if (typeof item[0] === "string") {
					createElement(item);
				} else if (item.nodeType) {
					target.appendChild(item);
				} else {
					frag(item, target);
				}
			}
		});
		return target;
	};
};