Fanfiction.net: Not-Crossover Link

Add link to not-Crossover page to Fanfiction.net.

You will need to install an extension such as Tampermonkey, Greasemonkey or Violentmonkey to install this script.

You will need to install an extension such as Tampermonkey or Violentmonkey to install this script.

You will need to install an extension such as Tampermonkey or Violentmonkey to install this script.

You will need to install an extension such as Tampermonkey or Userscripts to install this script.

You will need to install an extension such as Tampermonkey to install this script.

You will need to install a user script manager extension to install this script.

(I already have a user script manager, let me install it!)

You will need to install an extension such as Stylus to install this style.

You will need to install an extension such as Stylus to install this style.

You will need to install an extension such as Stylus to install this style.

You will need to install a user style manager extension to install this style.

You will need to install a user style manager extension to install this style.

You will need to install a user style manager extension to install this style.

(I already have a user style manager, let me install it!)

// ==UserScript==
// @name         Fanfiction.net: Not-Crossover Link
// @namespace    https://greasyfork.org/en/users/163551-vannius
// @version      1.9
// @license      MIT
// @description  Add link to not-Crossover page to Fanfiction.net.
// @author       Vannius
// @match        https://www.fanfiction.net/crossovers/*
// @match        https://www.fanfiction.net/*Crossovers/*
// @icon         https://www.google.com/s2/favicons?sz=64&domain=fanfiction.net
// @grant        GM_openInTab
// ==/UserScript==

(function () {
    'use strict';

    // Config
    const OPEN_IN_NEW_TAB = true;

    // Functions
    // Replace and delete prohibited characters.
    function deleteProhibitedCharacter (text) {
        return text.replace(/('\. |\/| & | - | + )+/g, ' ').replace(/[.,+!:;|☆★!?]+/g, '');
    }

    // Return imgTag with click event
    function addClickToNotCrossover (imgTag, url) {
        imgTag.addEventListener('click', function (e) {
            e.preventDefault();
            // eslint-disable-next-line no-undef
            fetch(url, { method: 'GET', mode: 'same-origin', cache: 'default' })
                .then(response => response.text())
                .then(body => {
                    const doc = document.implementation.createHTMLDocument('myBody');
                    doc.documentElement.innerHTML = body;
                    const content = doc.getElementById('content_wrapper_inner');

                    const list = content.getElementsByClassName('z-list');

                    let destination = '';
                    if (list.length) destination = url; // Bingo.

                    const candidates = content.querySelectorAll('.gui_normal a');
                    if (candidates.length === 1) {
                        destination = candidates[0].href; // Only candidate.
                    } else if (candidates.length > 1) {
                        destination = url; // Suggestion page. There can be several candidates for same fandom.
                    }

                    // Move to Not-Crossover page.
                    if (OPEN_IN_NEW_TAB) {
                        // eslint-disable-next-line no-undef
                        GM_openInTab(destination);
                    } else {
                        window.location.href = destination;
                    }
                }).catch(error => console.log(error));
        });
        return imgTag;
    }

    // Main
    const splitPath = window.location.href.split('/');

    if (/^.+[-_]Crossovers$/.test(splitPath[3]) && splitPath[5] !== '0') {
        // Crossover page of two specific fandoms
        // Scrape each fandom link
        const divTag = document.getElementById('content_wrapper_inner');
        const titleTags = [divTag.children[1], divTag.children[2]];

        for (let titleTag of titleTags) {
            // Make joinTitle by replacing and deleting prohibited symbols
            const joinedTitle = deleteProhibitedCharacter(titleTag.textContent).split(' ').join('-');
            const url = [window.location.origin, 'anime', joinedTitle, ''].join('/');

            // Make link to Not-Crossover
            const imgTag = document.querySelector('#content_wrapper_inner > img');
            const addImgTag = addClickToNotCrossover(imgTag.cloneNode(false), url);
            addImgTag.title = "Not-Crossover";
            addImgTag.style.transform = "scale(-1, 1)";

            // Add link and place adjustment
            const fragment = document.createDocumentFragment();
            fragment.appendChild(addImgTag);
            fragment.appendChild(document.createTextNode(' '));
            imgTag.parentNode.insertBefore(fragment, titleTag);
        }
    } else {
        // Crossover page of one specific fandom
        // Make title and url by splitPath[4] or splitPath[3]
        const title = (splitPath[3] === 'crossovers') ? splitPath[4] : splitPath[3].slice(0, -"-Crossovers".length);
        const url = [window.location.origin, 'anime', title, ''].join('/');

        // Make link to Not-Crossover
        const imgTag = document.querySelector('#content_wrapper_inner > img');
        const addImgTag = addClickToNotCrossover(imgTag.cloneNode(false), url);
        addImgTag.title = "Not-Crossover";
        addImgTag.style.transform = "scale(-1, 1)";

        // Add link and place adjustment
        const fragment = document.createDocumentFragment();
        fragment.appendChild(document.createTextNode(' '));
        fragment.appendChild(addImgTag);
        imgTag.parentNode.insertBefore(fragment, imgTag.nextSibling);

        // Crossover page of one specific fandom and all fandoms
        if (splitPath[5] === '0') {
            splitPath.pop();
            splitPath[6] = '';
            splitPath[5] = splitPath[4];
            splitPath[4] = splitPath[3].slice(0, -"-Crossovers".length);
            splitPath[3] = 'crossovers';
            const selectFandomLink = splitPath.join('/');

            const textNodeTag = document.querySelector('#content_wrapper_inner > img + img').nextSibling;
            const splitText = textNodeTag.textContent.split(/(\n\s+)/g);
            const splitFandomText = splitText.filter(x => /\w/.test(x) && x !== 'Crossovers')[0];
            const selectFandomLinkTag = document.createElement('a');
            selectFandomLinkTag.href = selectFandomLink;
            selectFandomLinkTag.textContent = splitFandomText;

            const fragment = document.createDocumentFragment();
            splitText.filter(x => x).forEach(x => {
                if (/\w/.test(x) && x !== 'Crossovers') {
                    fragment.appendChild(selectFandomLinkTag);
                } else {
                    fragment.appendChild(document.createTextNode(x));
                }
            });
            textNodeTag.parentNode.replaceChild(fragment, textNodeTag);
        }
    }
})();