football-score-protector.js

// ==UserScript==
// @name     Replace lots of terms on an AJAX'd page
// @include  *
// @grant    none
// ==/UserScript==

(function() {
var replaceArry = [
        [/([^0-9])[0-9]([^0-9])/g,    '$1🎲$2'],
        [/^[0-9]$/,    '🎲'],
    // etc.
];
var numTerms    = replaceArry.length;
var transTimer  = setInterval (translateTermsOnPage, 1000); 

function translateTermsOnPage () {
    /*--- Replace text on the page without busting links or javascript 
        functionality.
    */
    var txtWalker   = document.createTreeWalker (
        document.body,
        NodeFilter.SHOW_TEXT, {
            acceptNode: function (node) {
              if (node.nodeValue.trim() ) {
                        return NodeFilter.FILTER_ACCEPT;
              }
  
                  //-- Skip whitespace-only nodes
                    return NodeFilter.FILTER_SKIP;
            }
        },
        false
    );
    var txtNode     = null;
    while (txtNode  = txtWalker.nextNode () ) {
        txtNode.nodeValue       = replaceAllTerms (txtNode.nodeValue);
    }
    //
    //--- Now replace user-visible attributes.
    //
    var placeholderNodes    = document.querySelectorAll ("[placeholder]");
    replaceManyAttributeTexts (placeholderNodes, "placeholder");

    var titleNodes          = document.querySelectorAll ("[title]");
    replaceManyAttributeTexts (titleNodes, "title");
}

function replaceAllTerms (oldTxt) {
    for (var J  = 0;  J < numTerms;  J++) {
        oldTxt  = oldTxt.replace (replaceArry[J][0], replaceArry[J][1]);
    }
    return oldTxt;
}

function replaceManyAttributeTexts (nodeList, attributeName) {
    for (var J = nodeList.length - 1;  J >= 0;  --J) {
        var node    = nodeList[J];
        var oldText = node.getAttribute (attributeName);
        if (oldText) {
            oldText = replaceAllTerms (oldText);
            node.setAttribute (attributeName, oldText);
        }
        else
            throw "attributeName does not match nodeList in replaceManyAttributeTexts";
    }
}

translateTermsOnPage();
})();