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CF-Predictor

This extension predicts rating changes for Codeforces. It shows approximate deltas during and after the contest.

  1. // ==UserScript==
  2. // @name         CF-Predictor
  3. // @version      1.3.2
  4. // @description  This extension predicts rating changes for Codeforces. It shows approximate deltas during and after the contest.
  5. // @author       Originally by WslF, Edited by ZZYSonny
  6. // @license      Apache
  7. // @match        *://codeforces.com/contest/*/standings*
  8. // @match        *://codeforc.es/contest/*/standings*
  9. // @match        *://codeforces.ml/contest/*/standings*
  10. // @connect      cf-predictor-frontend.herokuapp.com
  11. // @connect      cf-predictor.herokuapp.com
  12. // @grant        GM_xmlhttpRequest
  13. // @namespace    https://greatest.deepsurf.us/users/169007
  14. // ==/UserScript==
  15.  
  16. (function() {
  17.     'use strict';
  18.     var partyNum = 0;
  19.     var results = [];
  20. 	showDeltas();
  21.  
  22.     function modifyPartyHtml(index, elem) {
  23.         var delta = '?';
  24.         var rank = ' ';
  25.         var seed = ' ';
  26.  
  27.         if (partyNum > 0) {
  28.             var handle = $(elem).find("td:eq(1)").find("a").last().html();
  29.             if (handle) {
  30.                 //next 2 lines - fix for legendary grandmaster
  31.                 handle = handle.replace('<span class="legendary-user-first-letter">','');
  32.                 handle = handle.replace('</span>','');
  33.                 if (handle in results) {
  34.                     delta = results[handle].delta;
  35.                     rank = results[handle].rank;
  36.                     seed = results[handle].seed;
  37.                 }
  38.             }
  39.         }
  40.  
  41.         var darkClass = "";
  42.         if (partyNum % 2 == 1) {
  43.             darkClass = "dark ";
  44.         }
  45.         var text;
  46.         if (partyNum == 0) {
  47.             text = "<th class='top right' style='width: 4em;'><span title='Rating change''>&Delta;</span></th>";
  48.         } else {
  49.             if (delta > 0) {
  50.                 text = "<td class='" + darkClass + "right'><span style='color:green;font-weight:bold;'>+" + delta + "</span></td>";
  51.             } else {
  52.                 text = "<td class='" + darkClass + "right'><span style='color:gray;font-weight:bold;'>" + delta + "</span></td>";
  53.             }
  54.         }
  55.  
  56.         partyNum++;
  57.         $(elem).append(text);
  58.         /*
  59.         text = "<td class='" + darkClass + "right'><span style='color:green;'>" + rank + "</span></td>";
  60.         $(elem).append(text);
  61.         text = "<td class='" + darkClass + "right'><span style='color:green;'>" + seed + "</span></td>";
  62.         $(elem).append(text);
  63.         */
  64.     }
  65.  
  66.     function showDeltas() {
  67.         var count = $(".standings").find("tr").length;
  68.         if (count > 2) {
  69.             var contestId = document.location.href.replace(/\D+/ig, ',').substr(1).split(',')[0];
  70.             var contestants = document.getElementsByClassName("contestant-cell");
  71.             var contestantsHandles = Array.from(contestants).map(x => x.innerText.trim());
  72.  
  73.             getDeltas(contestId, contestantsHandles, function() {
  74.                 $(".standings").find("tr").first().find("th").last().removeClass("right");
  75.                 $(".standings").find("tr").find("td").removeClass("right");
  76.                 $(".standings").find("tr").each(modifyPartyHtml);
  77.                 if (count % 2 == 0) {
  78.                     $(".standings").find("tr").last().find("td").last().replaceWith("<td class='smaller bottom right dark'>&Delta;</td>");
  79.                 } else {
  80.                     $(".standings").find("tr").last().find("td").last().replaceWith("<td class='smaller bottom right'>&Delta;</td>");
  81.                 }
  82.             });
  83.         }
  84.     }
  85.  
  86.     function parseDeltas(data, callback) {
  87.         for (var i = 0; i < data.result.length; i++) {
  88.             var handle = data.result[i].handle;
  89.             var delta = data.result[i].newRating - data.result[i].oldRating;
  90.             var rank = data.result[i].rank;
  91.             var seed = data.result[i].seed;
  92.  
  93.             var res = {
  94.                 delta : parseInt(delta),
  95.                 seed : parseInt(seed),
  96.                 rank : parseInt(rank)
  97.             };
  98.  
  99.             results[handle] = res;
  100.         }
  101.  
  102.         callback();
  103.     }
  104.  
  105.     function getDeltas(contestId, contestantsHandles, callback) {
  106.         // var localServer = "http://localhost:8080/"
  107.         var herokuServerOld = "https://cf-predictor-frontend.herokuapp.com/";
  108.         var pageOld = "GetNextRatingServlet?contestId=" + contestId;
  109.         var serverOld = herokuServerOld + pageOld;
  110.  
  111.         var herokuServerNew = "https://cf-predictor.herokuapp.com/";
  112.         var pageNew = "GetPartialRatingChangesServlet?contestId=" + contestId + "&handles="+contestantsHandles.join(",");
  113.         var serverNew = herokuServerNew + pageNew;
  114.  
  115.         try{
  116.             GM_xmlhttpRequest({
  117.                 method: "GET",
  118.                 url: serverOld,
  119.                 onload: function(res) {
  120.                     var text = res.responseText;
  121.                     var data = JSON.parse(text);
  122.                     parseDeltas(data, callback);
  123.                 }
  124.             });
  125.         }catch(err){
  126.             console.log(err);
  127.         }
  128.  
  129.     }
  130. })();