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Codeforces_spoiler_tutorial

Wrap spoilers in Codeforces tutorial in spoiler blocks

As of 02.05.2020. See ბოლო ვერსია.

// ==UserScript==
// @name         Codeforces_spoiler_tutorial
// @version      0.0.0
// @description  Wrap spoilers in Codeforces tutorial in spoiler blocks
// @match        https://codeforces.com/blog/entry/*
// @match        http://codeforces.com/blog/entry/*
// @run-at       document-start
// @namespace    https://gf.zukizuki.org/users/410786
// ==/UserScript==

function wrappedInSpoiler(node){
	while(node!==null){
		if(node.classList && node.classList.contains("spoiler")) return true;
		node=node.parentNode;
	}
	return false;
}

function wrapInSpoiler(nodes, spoilerTitle){
	if(!Array.isArray(nodes)) nodes=[nodes]
	if(nodes.length==0) return

	const spoilerElement=document.createElement("div")
	spoilerElement.classList.add("spoiler")
	spoilerElement.innerHTML='<b class="spoiler-title"></b><div class="spoiler-content" style="display: none;"></div>'
	spoilerElement.firstElementChild.innerText=spoilerTitle

	nodes[0].insertAdjacentElement('beforebegin', spoilerElement);
	nodes.forEach(function(node){
		spoilerElement.lastElementChild.appendChild(node) // "If the given child is a reference to an existing node in the document, appendChild() moves it from its current position to the new position"
	})
}

new MutationObserver(function(mutationList, observer){
	mutationList.forEach(function(mutation){
		mutation.addedNodes.forEach(function(node){
			if(node.classList!==undefined && node.classList.contains("problemTutorial")){
				if(!wrappedInSpoiler(node)){
					var spoilerTitle='Tutorial'
					const problemcode=node.getAttribute("problemcode")
					if(problemcode) spoilerTitle+=' - '+problemcode

					wrapInSpoiler(node, spoilerTitle)
				}
			}
		})
		//observer.disconnect()
		//console.log(mutation)
	})
}).observe(document, { childList: true, subtree: true });