var doc = w.document, docElem = doc.documentElement, mediastyles = [], rules = [], appendedEls = [], parsedSheets = {}, resizeThrottle = 30, head = doc.getElementsByTagName()

in Hands-on lab/lab-files/BigDataTravel/BigDataTravel/Scripts/respond.js [72:212]
113 lines of code
62 McCabe index (conditional complexity)

  var doc = w.document, docElem = doc.documentElement, mediastyles = [], rules = [], appendedEls = [], parsedSheets = {}, resizeThrottle = 30, head = doc.getElementsByTagName("head")[0] || docElem, base = doc.getElementsByTagName("base")[0], links = head.getElementsByTagName("link"), lastCall, resizeDefer, eminpx, getEmValue = function() {
    var ret, div = doc.createElement("div"), body = doc.body, originalHTMLFontSize = docElem.style.fontSize, originalBodyFontSize = body && body.style.fontSize, fakeUsed = false;
    div.style.cssText = "position:absolute;font-size:1em;width:1em";
    if (!body) {
      body = fakeUsed = doc.createElement("body");
      body.style.background = "none";
    }
    docElem.style.fontSize = "100%";
    body.style.fontSize = "100%";
    body.appendChild(div);
    if (fakeUsed) {
      docElem.insertBefore(body, docElem.firstChild);
    }
    ret = div.offsetWidth;
    if (fakeUsed) {
      docElem.removeChild(body);
    } else {
      body.removeChild(div);
    }
    docElem.style.fontSize = originalHTMLFontSize;
    if (originalBodyFontSize) {
      body.style.fontSize = originalBodyFontSize;
    }
    ret = eminpx = parseFloat(ret);
    return ret;
  }, applyMedia = function(fromResize) {
    var name = "clientWidth", docElemProp = docElem[name], currWidth = doc.compatMode === "CSS1Compat" && docElemProp || doc.body[name] || docElemProp, styleBlocks = {}, lastLink = links[links.length - 1], now = new Date().getTime();
    if (fromResize && lastCall && now - lastCall < resizeThrottle) {
      w.clearTimeout(resizeDefer);
      resizeDefer = w.setTimeout(applyMedia, resizeThrottle);
      return;
    } else {
      lastCall = now;
    }
    for (var i in mediastyles) {
      if (mediastyles.hasOwnProperty(i)) {
        var thisstyle = mediastyles[i], min = thisstyle.minw, max = thisstyle.maxw, minnull = min === null, maxnull = max === null, em = "em";
        if (!!min) {
          min = parseFloat(min) * (min.indexOf(em) > -1 ? eminpx || getEmValue() : 1);
        }
        if (!!max) {
          max = parseFloat(max) * (max.indexOf(em) > -1 ? eminpx || getEmValue() : 1);
        }
        if (!thisstyle.hasquery || (!minnull || !maxnull) && (minnull || currWidth >= min) && (maxnull || currWidth <= max)) {
          if (!styleBlocks[thisstyle.media]) {
            styleBlocks[thisstyle.media] = [];
          }
          styleBlocks[thisstyle.media].push(rules[thisstyle.rules]);
        }
      }
    }
    for (var j in appendedEls) {
      if (appendedEls.hasOwnProperty(j)) {
        if (appendedEls[j] && appendedEls[j].parentNode === head) {
          head.removeChild(appendedEls[j]);
        }
      }
    }
    appendedEls.length = 0;
    for (var k in styleBlocks) {
      if (styleBlocks.hasOwnProperty(k)) {
        var ss = doc.createElement("style"), css = styleBlocks[k].join("\n");
        ss.type = "text/css";
        ss.media = k;
        head.insertBefore(ss, lastLink.nextSibling);
        if (ss.styleSheet) {
          ss.styleSheet.cssText = css;
        } else {
          ss.appendChild(doc.createTextNode(css));
        }
        appendedEls.push(ss);
      }
    }
  }, translate = function(styles, href, media) {
    var qs = styles.replace(respond.regex.keyframes, "").match(respond.regex.media), ql = qs && qs.length || 0;
    href = href.substring(0, href.lastIndexOf("/"));
    var repUrls = function(css) {
      return css.replace(respond.regex.urls, "$1" + href + "$2$3");
    }, useMedia = !ql && media;
    if (href.length) {
      href += "/";
    }
    if (useMedia) {
      ql = 1;
    }
    for (var i = 0; i < ql; i++) {
      var fullq, thisq, eachq, eql;
      if (useMedia) {
        fullq = media;
        rules.push(repUrls(styles));
      } else {
        fullq = qs[i].match(respond.regex.findStyles) && RegExp.$1;
        rules.push(RegExp.$2 && repUrls(RegExp.$2));
      }
      eachq = fullq.split(",");
      eql = eachq.length;
      for (var j = 0; j < eql; j++) {
        thisq = eachq[j];
        mediastyles.push({
          media: thisq.split("(")[0].match(respond.regex.only) && RegExp.$2 || "all",
          rules: rules.length - 1,
          hasquery: thisq.indexOf("(") > -1,
          minw: thisq.match(respond.regex.minw) && parseFloat(RegExp.$1) + (RegExp.$2 || ""),
          maxw: thisq.match(respond.regex.maxw) && parseFloat(RegExp.$1) + (RegExp.$2 || "")
        });
      }
    }
    applyMedia();
  }, makeRequests = function() {
    if (requestQueue.length) {
      var thisRequest = requestQueue.shift();
      ajax(thisRequest.href, function(styles) {
        translate(styles, thisRequest.href, thisRequest.media);
        parsedSheets[thisRequest.href] = true;
        w.setTimeout(function() {
          makeRequests();
        }, 0);
      });
    }
  }, ripCSS = function() {
    for (var i = 0; i < links.length; i++) {
      var sheet = links[i], href = sheet.href, media = sheet.media, isCSS = sheet.rel && sheet.rel.toLowerCase() === "stylesheet";
      if (!!href && isCSS && !parsedSheets[href]) {
        if (sheet.styleSheet && sheet.styleSheet.rawCssText) {
          translate(sheet.styleSheet.rawCssText, href, media);
          parsedSheets[href] = true;
        } else {
          if (!/^([a-zA-Z:]*\/\/)/.test(href) && !base || href.replace(RegExp.$1, "").split("/")[0] === w.location.host) {
            if (href.substring(0, 2) === "//") {
              href = w.location.protocol + href;
            }
            requestQueue.push({
              href: href,
              media: media
            });
          }
        }
      }
    }
    makeRequests();
  };