$(document).ready(function () {

    //Get all <a> elements as an array
    var allHrefs = document.getElementsByTagName("a");

    //Declare another array to push <a>'s that are Twitter links
    var twitterHrefs = new Array();

    //This for loop cycles through all <a> elements
    for (i = 0; i < allHrefs.length; i++) {


        //Copy the URL to a string for code clarity, and declare booleans for use in this for loop.
        var twitterUrl = allHrefs[i].getAttribute("href");
        var isTwitter = false;

        //Does getAttribute *not* return a null?  And if it indeed does not, does it contain "twitter"?
        //We test for null because the code was breaking before I included the test.  I am not exactly sure
        //why getAttribute would return a null or what the exact case was that caused it.
        //This is an ad-hoc solution.
        if(twitterUrl != null) {
            isTwitter = twitterUrl.includes("twitter");
            }

        //if it did contain "twitter", then:
        if(isTwitter) {

            //Parse for an actual status link and not a link to someone's twitter page or the twitter homepage.
            //First, we must determine the prefix of the link -- http://www., http://, https://www, etc.
            //because this will determine the index of where we start parsing for the presence of a status URL.
            //We will do this in descending order of the index of the last "/".  Since the longest possible prefix is
            //https://www, we will parse for that first.  Then, http://www, then http://.

            //Declare the slash index
            var iSlash = 0;



            //Test the URL for prefixes in descending length.
            if(twitterUrl.includes("https://www.")) {
                iSlash = "https://www.twitter.com/".length;

            } else if(twitterUrl.includes("http://www.")) {
                iSlash = "http://www.twitter.com/".length;

            } else if(twitterUrl.includes("https://")) {
                iSlash = "https://twitter.com/".length;

            } else if(twitterUrl.includes("http://")) {
                iSlash = "http://twitter.com/".length;

            } else {
                iSlash = "twitter.com/".length;
            }


            //Make sure that twitterUrl.length is at least two characters longer than the value of iSlash, else
            //if(twitterUrl.indexOf("/",iSlash + 2) != -1) below could give an out-of-range error.
            if(twitterUrl.length > iSlash + 1) {

                //Now we can test for the presence of a "/" beyond the twitter base URL and the username.
                //To do this, we'll search for a "/" starting at iSlash plus two.  This is basically a test assuming
                //a one-character Twitter handle, and it accomodates handles of any length.
                if(twitterUrl.indexOf("/",iSlash + 2) != -1) {

                    //if we get here, then a slash exists.  Test for the "/" being the last character:
                    if(twitterUrl.indexOf("/",iSlash + 2) != twitterUrl.length) {

                        //if we get here, then there are characters beyond the slash, and our URL is indeed a status!  Hooray!
                        alert("We have ourselves a twitter status: " + twitterUrl);
                        twitterHrefs.push(allHrefs[i]);
                        var twitterEmbed = document.createElement("iframe");
                        twitterEmbed.setAttribute("border", 0);
                        twitterEmbed.setAttribute("frameborder", 0);
                        twitterEmbed.setAttribute("height", 250);
                        twitterEmbed.setAttribute("width", 750);
                        twitterEmbed.setAttribute("src", "http://twitframe.com/show?url=" + twitterUrl);



                        allHrefs[i].parentNode.replaceChild(twitterEmbed, allHrefs[i]);

                    }
                }
            }



        }

    };

});