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Danbooru Post Link Rating

Finds links to posts on Danbooru and appends that post's rating to the end

Ekde 2015/11/08. Vidu La ĝisdata versio. 

// ==UserScript==
// @name          Danbooru Post Link Rating
// @namespace     DoomTay
// @description   Finds links to posts on Danbooru and appends that post's rating to the end
// @include       http://danbooru.donmai.us/*
// @include       https://danbooru.donmai.us/*
// @version       1.0.5

// ==/UserScript==

var links = document.links;

for(var l=0; l<links.length; l++)
{
	if(links[l].firstChild.nodeName == "IMG") continue;
	if(document.getElementById("pool-nav") && document.getElementById("pool-nav").contains(links[l])) continue;
	if(links[l].href.indexOf("/posts/") > -1 && /\/posts\/(\d+)/.exec(links[l].href) != null)
	{
		var postID = /\/posts\/(\d+)/.exec(links[l].href)[1];
	}
	else if(links[l].href.indexOf("/post/show/") > -1 && /\/post\/show\/(\d+)(?:\/)?/.exec(links[l].href) != null)
	{
		var postID = /\/post\/show\/(\d+)(?:\/)?/.exec(links[l].href)[1];
	}
	else continue;
	if(window.location.href.indexOf(postID) > -1) continue;
	if(isNaN(postID)) continue;
	appendRating(links[l],postID);
}

function appendRating(link,id)
{
	var post = new XMLHttpRequest();
	var url = '/posts/' + id + '.json';
	post.onload = function () {
		var rating = JSON.parse(post.responseText).rating;
		var ratingReading = document.createElement("span");
		ratingReading.innerHTML = " (rating: " + rating + ")";
		link.parentNode.insertBefore(ratingReading, link.nextSibling);
	}
	post.open("GET", url, true);
	post.send();
}