Twitter bookmarklet that actually works

tweet.js

//javascript:
(function() {
    window.twttr = window.twttr || {};
    var D = 550,
        A = 450,
        C = screen.height,
        B = screen.width,
        H = Math.round((B / 2) - (D / 2)),
        G = 0,
        F = document,
        E;
    if (C > A) {
        G = Math.round((C / 2) - (A / 2))
    }
    window.twttr.shareWin = window.open('//twitter.com/share', '', 'left=' + H + ',top=' + G + ',width=' + D + ',height=' + A + ',personalbar=0,toolbar=0,scrollbars=1,resizable=1');
}());

(function() {
    var F, A, D;

    function B(M) {
        var N = [],
            L = 0,
            K = M.length;
        for (; L < K; L++) {
            N.push(M[L])
        }
        return N
    }

    function H(K) {
        return encodeURIComponent(K).replace(/\+/g, "%2B")
    }

    function C(M) {
        var L = [],
            K;
        for (K in M) {
            if (M[K] !== null && typeof M[K] !== "undefined") {
                L.push(H(K) + "=" + H(M[K]))
            }
        }
        return L.sort().join("&")
    }

    function I() {
        var L = document.getElementsByTagName("a"),
            R = document.getElementsByTagName("link"),
            K = /\bme\b/,
            N = /^https?\:\/\/(www\.)?twitter.com\/([a-zA-Z0-9_]+)$/,
            Q = B(L).concat(B(R)),
            P, T, M, O = 0,
            S;
        for (;
            (S = Q[O]); O++) {
            T = S.getAttribute("rel");
            M = S.getAttribute("href");
            if (T && M && T.match(K) && (P = M.match(N))) {
                return P[2]
            }
        }
    }

    function G() {
        var K = window.getSelection && String(window.getSelection());
        return K && "%C3%A2%E2%82%AC%C5%93" + K.replace(/\n/, " ").replace(/(^\s+)|(\s+$)/, "") + "%C3%A2%E2%82%AC%C2%9D"
    }

    function E(L) {
        var K;
        if (L.match(/^https?:\/\//)) {
            return L
        } else {
            K = location.host;
            if (location.port.length > 0) {
                K += ":" + location.port
            }
            if (L.match(/^\/[^\/]/)) {
                return [location.protocol, "//", K, L].join("")
            } else {
                return [location.protocol, "//", K, location.pathname.replace(/\/([^\/]+)$/, "/"), L].join("")
            }
        }
    }

    function J() {
        var K = document.getElementsByTagName("link"),
            L, M;
        for (L = 0, M;
            (M = K[L]); L++) {
            if (M.getAttribute("rel") == "canonical") {
                return E(M.getAttribute("href"))
            }
        }
        return null
    }
    D = (function() {
        var L = {
            text: G() || decodeURIComponent(document.title),
            url: (J() || location.href),
            _: ((new Date()).getTime())
        }, K = I();
        if (K) {
            L.via = K
        }
        return C(L)
    }());
    F = window.twttr.shareWin;
    A = "//twitter.com/share?" + D;
    console.log(A);
    if (null === F) {
        window.location.href = A
    } else {
        if (F && F.open) {
            F.location.href = A;
            F.focus()
        }
    }
}());