User:Lupin/recentdiffs.js

// <pre><nowiki>

// **************************************************
// Downloader
// **************************************************

window.Downloader=function(url) {
  // Source: http://jibbering.com/2002/4/httprequest.html
  this.http = false;

  /*@cc_on @*/
  /*@if (@_jscript_version >= 5)
  // JScript gives us Conditional compilation, 
  // we can cope with old IE versions.
  // and security blocked creation of the objects.
  try {
  this.http = new ActiveXObject("Msxml2.XMLHTTP");
  } catch (e) {
  try {
  this.http = new ActiveXObject("Microsoft.XMLHTTP");
  } catch (E) {
  // this.http = false;
  }
  }
  @end @*/

  if (! this.http && typeof XMLHttpRequest!='undefined') this.http = new XMLHttpRequest();

  this.url = url; this.id=null;
  this.lastModified = null;
  this.callbackFunction = null;
};

Downloader.prototype.send = function (x) {if (!this.http) return null; return this.http.send(x);};
Downloader.prototype.abort = function () {if (!this.http) return null; return this.http.abort();};
Downloader.prototype.runCallback = function () {this.callbackFunction(this);};
Downloader.prototype.getData = function () {if(!this.http) return null; return this.http.responseText;};
Downloader.prototype.setTarget = function () {if(!this.http) return null; this.http.open("GET", this.url, true);};
Downloader.prototype.start=function () {if(!this.http) return null; return this.http.send(null);};
Downloader.prototype.getReadyState=function () {if(!this.http) return null; return this.http.readyState;};

Downloader.prototype.getLastModifiedDate=function () {
  if(!this.http) return null; 
  var lastmod=null;
  try {
    lastmod=this.http.getResponseHeader('Last-Modified'); 
  } catch (err) {}
  if (lastmod) return new Date(lastmod);
  return null;
}

Downloader.prototype.setCallback = function (f) { 
  if(!this.http) return;
  this.http.onreadystatechange = f;
  this.callbackFunction = f;
};

Downloader.newDownload = function(url, id, callback) {
  var d=new Downloader(url);
  if (!d.http) return 'ohdear';
  d.id=id;
  d.setTarget();
  var f = function () {
    if (d.getReadyState() == 4) { 
      d.data=d.getData(); 
      d.lastModified=d.getLastModifiedDate();
      callback(d);
    }
  };
  d.setCallback(f);
  return d;//d.start();
};

Downloader.startDownload = function (url, id, callback, userData) {
  var d=Downloader.newDownload(url, id, callback); 
  d.userData=userData;
  if (typeof d == typeof '' ) return d;
  return d.start();
};

// **************************************************
// DOM abbreviations
// **************************************************

$a = function (obj, parent) { 
  var p=(parent)?parent:document.body; 
  if (typeof obj== 'object' && 
      obj.length != null && obj.length > 0 && 
      typeof obj[0] == 'object' && obj[0].nodeType!=null) {
      // assume it's a list of nodes
    for (var i=0; i<obj.length; ++i) {
      p.appendChild(obj[i]);
    }
  } else p.appendChild(obj); 
}
$e=function (id) {return document.getElementById(id);};
$c=function(elt) {return document.createElement(elt);},
$t=function(txt) {return document.createTextNode(txt);};
$ee=function(nm, parent) {var p=(parent)?parent:document; return p.getElementsByTagName(nm);};

// **************************************************
// Downloadqueue
// **************************************************

window.Downloadqueue=function(max) {
  this.max=max || 5;
  this.queue=[];
  this.active={length: 0, highestIndex: 0};
  
  this.timer=null;
  this.freq=1000;
  this.runFunction=Downloader.startDownload;
  this.runQueueHook=function() {};
  this.downloadCompleteHook=function() {};
}

Downloadqueue.prototype.push=function() {
  this.queue.push(arguments);
}

Downloadqueue.prototype.runQueue=function () {
  //  document.title=['active:'+this.active.length, 'max:'+this.max, 'queuelen:'+this.queue.length].join('|');
  this.runQueueHook();
  if (this.active.length < this.max && this.queue.length > 0) {
    var newActive=this.queue.shift();
    var f=newActive[2];
    var savedThis=this;
    var idString=this.active.highestIndex++;
    idString=idString.toString();
    this.active[idString]=newActive;
    ++this.active.length;
    // modify the third argument (the callback) so that it deletes the entry from this.active
    // NB this is brittle - will break if the signature of this.runFunction changes
    newActive[2] = function (d) { 
      f(d); 
      savedThis.active[idString]=null;
      --savedThis.active.length; 
      savedThis.downloadCompleteHook();
    };
    this.activeId++;
    this.runFunction.apply(window, newActive);
    this.runQueue.apply(this, []); // run again to top up if needed
  }
}

Downloadqueue.prototype.start=function () {
  var savedThis=this;
  this.timer=setInterval(function () { savedThis.runQueue.apply(savedThis) }, this.freq);
}

// **************************************************
// Recentchecker
// **************************************************

window.Recentchecker = function () {
  this.status=$c('div'); var h1=$ee('h1')[0];
  h1.parentNode.insertBefore(this.status, h1.nextSibling);

  this.queue=new Downloadqueue(10);

  this.numHits=0;
  var savedThis=this;
  this.queue.runQueueHook=function () { 
    var keys=[];
    for (var k in savedThis.queue.active) { 
      if (savedThis.queue.active[k] && k != 'length' && k != 'highestIndex')
        keys.push(k);
    }
    var s=[savedThis.numHits, ' diffs shown<br>',
           savedThis.queue.active.length, ' active downloads, keys=[', keys.join(','), ']<br>',
           savedThis.queue.queue.length, ' waiting'].join('');
    savedThis.status.innerHTML=s;
  }
  this.queue.downloadCompleteHook=this.queue.runQueueHook;
  this.queue.start();
}



Recentchecker.prototype.getDiffs=function () {
  var ret=[];
  for (var i=0; i<document.links.length; ++i) {
    switch (document.links[i].innerHTML) {
    case 'diff': case '(diff)':
    case 'last':
      ret.push(document.links[i]);
    }
  }
  this.diffPages=ret;
}

Recentchecker.prototype.checkDiffs=function (re) {
  if (this.diffPages==null) this.getDiffs();
  for (var i=0; i<this.diffPages.length; ++i) {
    var savedThis=this;
    var f=function(d) { savedThis.diffHandler.apply(savedThis, [d]); };
    this.queue.push(this.diffPages[i].href, 0, f, {sourceNode: this.diffPages[i], regex: re});
  }
}

Recentchecker.prototype.diffHandler=function (d) {
  var data=d.data.replace(RegExp("^<tr>.*class='diff-context'.*$", 'gm'), '');
  var diffTableMatch=/<table[^>]*?class='diff'[^>]*?>(.|\n)*?<\/table>/.exec(data);
  if (!diffTableMatch) return;
  var diffTable=diffTableMatch[0];
  var re=d.userData.regex;
  var match = ( ! re  ||  re.exec(diffTable));
  if (! match) return;
  this.numHits++;
  var diffNode=d.userData.sourceNode;
  var newDiv=$c('div'); newDiv.innerHTML='Match: ' + match[1] + '<br>' + match[0] + '<br>' + diffTable;
  var nextBrSib=nextSiblingOfType(diffNode, 'br');
  if (nextBrSib && nextBrSib.nextSibling) { 
    nextBrSib = nextBrSib.nextSibling; 
    diffNode.parentNode.insertBefore(newDiv, nextBrSib);
  } else diffNode.parentNode.appendChild(newDiv);
}

// **************************************************
// Miscellany
// **************************************************

function isNodeName(node, str) { 
  return node.nodeName.toUpperCase() == str.toUpperCase(); 
}

function nextSiblingOfType(node, type) {
  for (var n=node; n; n=n.nextSibling) {
    if (isNodeName(n, type)) return n;
  }
  return null;
}

window.gettingBadWords=false;
window.badWords=null;
function getBadWords() {
  window.gettingBadWords=true;
  var d=
    Downloader.startDownload(
       'http://en.wikipedia.org/w/index.php?title=User:Lupin/badwords&action=raw&ctype=text/css',
       0,
       processBadWords);
}
function processBadWords(d) {
  var data=d.data.split('\n');
  var ret=[];
  for (var i=0; i<data.length; ++i) {
    var s=data[i];
    if (s.length==0) continue;
    if (s.charAt(0)=='<') continue;
    ret.push(s.replace(RegExp('([-|.()\\+:!,?*^${}\\[\\]])', 'g'), '\\$1'));
  }
  window.badWords=RegExp("<td class='diff-addedline'>.*(([^.\s])\1\1|\\b(" + ret.join('|') + ")\\b).*</td>", 'im');
}

function runOnce(f, time) {
  var i=runOnce.timers.length;
  var ff = function () { clearInterval(runOnce.timers[i]); f() };
  var timer=setInterval(ff, time);
  runOnce.timers.push(timer);
}
runOnce.timers=[];
runOnce.index=0;


function filteredRecentDiffs() {
  if (! window.gettingBadWords) { getBadWords(); }
  if (! window.badWords) { runOnce(filteredRecentDiffs, 500); return; }
  new Recentchecker().checkDiffs(badWords);
}

function checkRecentDiffs() {
  new Recentchecker().checkDiffs();
}


// **************************************************
// Installation
// **************************************************

function addlilink(tabs, url, name, id, title, key){
    var na = document.createElement('a');
    na.href = url;
    na.appendChild(document.createTextNode(name));
    var li = document.createElement('li');
    if(id) li.id = id;
    li.appendChild(na);
    tabs.appendChild(li);
    if(id)
    {
        if(key && title)
        {
            ta[id] = [key, title];
        }
        else if(key)
        {
            ta[id] = [key, ''];
        }
        else if(title)
        {
            ta[id] = ['', title];
        }
    }
    // re-render the title and accesskeys from existing code in wikibits.js
    akeytt();
    return li;
}

function addToolboxLink(url, name, id){
    var tb = document.getElementById('p-tb').getElementsByTagName('ul')[0];
    addlilink(tb, url, name, id);
}

function addPowerdiffLink() {
  addToolboxLink('#', 'Show filtered diffs', 'toolbox_filtereddiffs');
  $e('toolbox_filtereddiffs').onclick=filteredRecentDiffs;
  addToolboxLink('#', 'Show all diffs', 'toolbox_alldiffs');
  $e('toolbox_alldiffs').onclick=checkRecentDiffs;
}

if (window.addEventListener) {
  window.addEventListener("DOMContentLoaded",addPowerdiffLink,false) || window.addEventListener("load", addPowerdiffLink, false);
}
else if (window.attachEvent) {
  window.attachEvent("onload",addPowerdiffLink);
}
else {
  window._old_recent_onload = window.onload;
  window.onload = function() {
    window._old_recent_onload();
    addPowerdiffLink();
  }
}




// </nowiki></pre>

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