Bookmarklet: Converts BibTex from serveral Sources to APA Style References

bibtex2apa.js

(function(){window.open().document.body.innerHTML=(function(txt){
  txt = txt.replace(/\\(.)\{?\\?(\w)\}?/g, function(m,p1,p2) {
    switch (p1) {
      case "`":
        return p2 + "̀";
      case "'":
        return p2 + "́";
      case "^":
        return p2 + "̂";
      case "~":
        return p2 + "̃";
      case "=":
        return p2 + "̄";
      case "u":
        return p2 + "̆";
      case ".":
        return p2 + "̇";
      case "\"":
        return p2 + "̈";
      case "r":
        return p2 + "̊";
      case "H":
        return p2 + "̋";
      case "v":
        return p2 + "̌";
      case "c":
        return "&" + p2 + "cedil;";
      case "k":
        return "&" + p2 + "ogon;";
      default:
        return p2;
    }
  });
  txt = txt.replace(/{(([a-zA-Z()-]|&#\d+;)+)}/g, "$1");

  var re = function(f,t) {
    var r = new RegExp("\\s" + f + "\\s*=\\s*\\{?(.+?)\\}?(,[\n\r]|\\})", "g");
    var m = r.exec(t);
    return m ? m[1].replace(/\{(.+?)\}/g, "$1") : undefined;
  };

  var a = re("author",txt);
  var y = re("year",txt);
  var t = re("title",txt);
  var b = re("booktitle",txt);
  var j = re("journal",txt);
  var v = re("volume",txt);
  var n = re("number",txt);
  var p = re("pages",txt);
  var d = re("doi",txt);
  var u = re("url",txt);
  var s = re("series",txt);
  var bu = re("biburl",txt);

  a = a.split(/\s+and\s+/g).map(function(fn){
    fn = fn.split(/\s*,\s*/g).reverse().join(" ").split(/\s+/g);
    var ln = fn.pop();
    fn = fn.map(function(n) {
      return n[0] + ".";
    });
    return ln + ", " + fn.join(" ");
  });
  var la = a.pop();
  a = a.length > 0 ? a.join(", ") + ", & " + la : la;

  t = bu ? "<a href=\"" + bu + "\">" + t + "</a>" : t;

  p = p ? ", " + p.replace(/--/g, "-").replace(/\\/g, "") : "";

  v = v ? ", <i>" + v + "</i>" + (n ? "(" + n + ")" : "") : "";
  s = s ? ", <i>" + s + "</i>" : "";
  j = j ? ". <i>" + j.replace(/\\/g, "").replace(/&amp;/g, "&") + "</i>" + s + v : "";

  d = d ? " <a href=\"" + (u ? u : "https://doi.org/" + d) + "\">doi:" + d + "</a>" : "";

  b = b ? ". <i>" + b + "</i>" + s : undefined;
  y = y ? y : "n.d.";

  return a + " (" + y + "). " + t + (b || j) + p + "." + d;
})(window.getSelection().getRangeAt(0).cloneContents().textContent.split("\n").join(" ").replace(/\s+/g, " "));
})();