An improved reimplementation of mtg.js for Board & Card Games SE

mtg_v2.user.js

// ==UserScript==
// @name        Improved MtG card links
// @version     2.0
// @namespace   https://github.com/vyznev/
// @description An improved reimplementation of mtg.js for Board & Card Games SE
// @author      Ilmari Karonen
// @license     Public Domain (CC-Zero)
// @match       *://boardgames.stackexchange.com/*
// @match       *://meta.boardgames.stackexchange.com/*
// @grant       none
// ==/UserScript==

StackExchange.ready(function () {
    // config variables
    var urlTemplate = 'http://gatherer.wizards.com/Pages/Card/Details.aspx?name=$1';
    var windowFeatures = 'scrollbars=1, resizable=1, width=770, height=890';
    
    
    // click event handler to open MtG card links in a new window
    $(document).on('click', 'a.mtg-autocard', function (event) {
        if (event.button !== 0) return ;
        window.open(this.href, 'autocard' + (+new Date()), windowFeatures);
        return false;
    });
    
    
    // Markdown converter hook to parse card links are not parsed in edit preview
    // code loosely based on makeTagLinks() in http://dev.stackoverflow.com/content/Js/wmd.en.js
    function makeMtGLinks (text) {
        var excludeRanges = null;
        return text.replace(/\[mtg:([^\[\]]+)\]/g, function (fullMatch, cardName, offset) {
            // don't replace [mtg:] links inside <a> or <code> tags;
            // but don't bother looking for them unless we actually see such a link 
            if (excludeRanges === null) {
                var re = /<(a|code)\b[^>]*>.*?<\/\1>/gi, match;
                excludeRanges = [];
                while ((match = re.exec(text)) !== null) {
                    excludeRanges.push(match.index, re.lastIndex);
                }
            }
            var skip = false;
            for (var i = 0; i < excludeRanges.length; i++) {
                if (offset < excludeRanges[i]) break;
                skip = !skip;
            }
            if (skip) return fullMatch;
            var linkName = cardName.replace(/&lt;/g, '<').replace(/&gt;/g, '>').replace(/&amp;/g, '&');
            var linkUrl = urlTemplate.replace(/\$1/g, encodeURIComponent(linkName));
            return '<a class="mtg-autocard" target="_blank" href="' + linkUrl + '">' + cardName + '</a>';
        });
    }

    StackExchange.ifUsing('editor', function () {
        StackExchange.MarkdownEditor.creationCallbacks.add(function (editor) {
            editor.getConverter().hooks.chain('postConversion', makeMtGLinks);
        });
    });
    
    
    // HOTFIX: change the URLs in server-side generated card links, fix double-escaping
    // this should really be fixed on the server side and this code removed
    function fixCardLinks() {
        var cardLinks = $('a.mtg-autocard[href*="autocard.asp"]:not(.hotfixed)');
        cardLinks.addClass('hotfixed');
        cardLinks.each(function () {
            this.href = this.href.replace(
                /^http:\/\/www\.wizards\.com\/magic\/autocard\.asp\?name=([^&#]+)$/, urlTemplate
            ).replace(/%26lt%3[Bb]/g, '%3C') .replace(/%26gt%3[Bb]/g, '%3E') .replace(/%26amp%3[Bb]/g, '%26');
            this.textContent = this.textContent.replace(/&lt;/g, '<').replace(/&gt;/g, '>').replace(/&amp;/g, '&');
        });
    }
    fixCardLinks();

    // re-run the hotfix whenever new posts are loaded via AJAX
    var urlRegex = /^\/posts\/(ajax-load-realtime|\d+\/edit-submit)\/|^\/review\/(next-task|task-reviewed)\b/;
    $(document).ajaxComplete(function (event, xhr, settings) {
        if (urlRegex.test(settings.url)) setTimeout(fixCardLinks, 10);
    });
});