Endless E-hentai Pages

View e-hentai searches, thumbnails, and images on a single endless page.
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// ==UserScript==
// @name           Endless E-hentai Pages
// @description    View e-hentai searches, thumbnails, and images on a single endless page.
// @author         Couchy
// @version        201117
// @namespace      https://greasyfork.org/en/users/50-couchy
// @include        *://e-hentai.org/*
// @include        *://exhentai.org/*
// @grant          none
// @noframes
// ==/UserScript==

if(document.getElementById("wcr_btnsettings")) {
    return;
}

let appendTo;
const pageType = (appendTo = safeArray(document.getElementsByClassName("itg"),0)) ? 1 :
                 (appendTo = document.getElementById("gdt")) ? 2 :
                 (appendTo = document.getElementById("i1")) ? 3 : -1;

let currentPage;
let ready = true;
let wait = (pageType == 2) ? 0 : 3500;
let resize = 100;
let auto = false;
let autoTimeout = null;
currentPage = new page(document);
if(pageType == 3){
    appendTo = document.body;
    document.body.setAttribute("style", "text-align:center;");
    appendTo.innerHTML = currentPage.content;
    galleryStyle(document, true);
    const imageError = `function imageError(brokeImg){
        brokeImg.setAttribute("brokesrc", (brokeImg.setAttribute("brokesrc") || brokeImg.setAttribute("src")));
        brokeImg.setAttribute("title", "Click to reload!");
        brokeImg.setAttribute("onclick", "this.setAttribute('src', this.getAttribute('brokesrc')+'?v='+(new Date).getTime()); this.removeAttribute('onclick'); this.removeAttribute('title')");
        brokeImg.setAttribute("src", "data:image/png;base64,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");
    };`;
    const script = document.createElement("script");
    script.textContent = imageError;
    document.head.appendChild(script);
}
currentPage.content = "";

const eventHandler = function(e){
    if(e.keyCode == 39){
        if(!e.shiftKey && !e.ctrlKey && currentPage.nextURL && ready && !auto){
            pause();
            get();
        }
        else if(e.ctrlKey && !e.shiftKey && pageType == 3){
            const scale = parseInt(prompt("Image Scale","100"));
            if(scale){
                resize = scale;
                galleryStyle(document, false);
            }
        }
        else if(e.shiftKey && !e.ctrlKey && currentPage.nextURL && ready){
            const delay = parseInt(prompt("Enter time delay in ms or click cancel to stop. (WARNING: short delays may cause errors/bans!)", "10000"));
            if(delay){
                auto = true;
                wait = parseInt(delay);
                get();
            }
            else{
                clearTimeout(autoTimeout);
                auto = false;
                wait = (pageType == 2) ? 0 : 3500;
                ready = true;
                document.body.style.cursor = "default";
            }
        }
    }
};
document.onkeydown = null;
const eventListener = document.addEventListener("keydown", eventHandler, false);
if(wait > 0){
    pause();
    document.body.style.cursor = "default";
    setTimeout(resume, wait);
}

function safeArray(a, i){
    try{return a[i];}
    catch(e){return "";}
}

function page(doc){
    this.content =
        /*Search, Thumbs*/ doc.querySelector(".itg, #gdt")?.innerHTML ||
        /*Images*/safeArray(doc.body.innerHTML.match(/<a onclick="[^>]*?" href="[^>]*?">(<img id="img" src="[^>]{150,}?"[^>]*?>)/i), 0).replace(/>$/i, " onerror=\"imageError(this);\" onabort=\"imageError(this);\">") + "<br/><br/><br/><br/><br/>";
    this.nextURL = htmlDecode(
        /*Search*/safeArray(doc.body.innerHTML.match(/<a href="(http[^"]*)"[^>]*>&gt;<\/a>/i),1) ||
        /*Thumbs*/function(){const thumbURL=document.location.href.match(/^http:\/\/e(x|-)hentai\.org\/g\/.*\//i);var str=safeArray(doc.body.innerHTML.match(/<td onclick="sp\(([0-9]*)\)"><a href="#" onclick="return false">&gt;<\/a>/i),1);return str?thumbURL+"?p="+str:undefined;}() ||
        /*Images*/function(){const str=safeArray(doc.body.innerHTML.match(/<a onclick="([^>]*?)" href="([^>]*?)"><img id="img" src="([^>]{150,}?)"/i),2);return(str&&str!=currentPage?.nextURL)?str:"";}()
        );
    console.log(this);
}

function galleryStyle(target, initial){
    const imgs = target.getElementsByTagName("img");
    for(const img of imgs){
        if(initial){
            img.setAttribute("oldwidth", img.style.width);
            img.setAttribute("oldheight", img.style.height);
        }
        img.style.width = (parseInt(img.getAttribute("oldwidth"))*resize/100)+"px";
        img.style.height = (parseInt(img.getAttribute("oldheight"))*resize/100)+"px";
    }
}

function pause(){
    ready = false;
    document.body.style.cursor = "wait";
}

function resume(){
    ready = true;
    document.body.style.cursor = "default";
}

function html2dom(html){
    const container = (pageType == 3) ? document.createElement("div") : document.createElement("tbody");
    container.innerHTML = html.replace(/<script(.|\s)*?\/script>/gi,"").replace(/<iframe(.|\s)*?\/iframe>/gi,"");
    if(pageType == 3) {
        galleryStyle(container, true);
    }
    return container;
}

function htmlDecode(input){
    if(typeof input === "undefined") {
        return undefined;
    }
    const e = document.createElement("div");
    e.innerHTML = input;
    return e.childNodes.length === 0 ? "" : e.childNodes[0].nodeValue;
}

function get(){
    const xhr = new XMLHttpRequest();
    xhr.ontimeout = xhr.onerror = resume;
    xhr.onload = function(){
        currentPage = new page(xhr.responseXML);
        appendTo.appendChild(html2dom(currentPage.content));
        //if(pageType == 3){document.images[document.images.length-1].scrollIntoView();}
        currentPage.content = "";
        if(auto && currentPage.nextURL) {
            autoTimeout = setTimeout(get, wait);
        }
        else if(currentPage.nextURL) {
            setTimeout(resume, wait);
        }
        else {
            resume();
            ready = false;
        }
    };
    xhr.responseType = "document";
    xhr.open("GET", currentPage.nextURL, true);
    xhr.send();
}