Misplaced Pages

Revision as of 01:56, 8 August 2005

// CONTENTS

// Utility functions

// Popup stuff
//   global variables 
//   html generation 
//   downloading 
//   link generation 
//   manipulation functions 
//   tests 
//   actions 
//   thingies 

////////////////////////////////////////////////////////////////////
// Utility functions
////////////////////////////////////////////////////////////////////

function time() {
  var d=new Date();
  return d.getHours() + ':' + d.getMinutes() + ':' + d.getSeconds() +
    '.' + (d.getTime() % 1000);
};

var gMsg='';
function log(x) { if(gMsg!='')gMsg += '\n'; gMsg+=time() + ' ' + x; };

function myalert(x) { return alert(time()+'\n'+ x); };


// eg sourceJS('http://www.bosrup.com/web/overlib/overlib.js');

function sourceJS(url) {
  var str='<script type="text/javascript" src="';
  str += url;
  str += '"></script>';
  return document.write(str);
};

// eg sourceWikipediaJS('en.wikipedia.org', 'User:Lupin/overlib.js');

function sourceWikipediaJS(wiki, name) {
  var url='http://' + wiki + '/search/?title=';
  url += name;
  url += '&action=raw&ctype=text/javascript&dontcountme=s';
  return sourceJS(url);
};

// eg sourceLupinJS('overlib');

function sourceLupinJS(name) {
  return sourceWikipediaJS('en.wikipedia.org', 'User:Lupin/'+name + '.js');
};

////////////////////////////////////////////////////////////////////
// Popup stuff
////////////////////////////////////////////////////////////////////

sourceLupinJS('livepreview');
sourceLupinJS('overlib');
sourceLupinJS('md5-2.2alpha');

// this shouldn't be needed. maybe my cache needs purging...
function md5_hex(s) { return rstr2hex(rstr_md5(str2rstr_utf8(s))); };

//////////////////////
// GLOBAL VARIABLES //
//////////////////////

// regexes

var exceptions=/((title=|\/)Special:|section=)/ ;
var contributions=/(title=|\/)Special:Contributions(&target=|\/|\/User:)(.*)/ ;
var emailuser=/(title=|\/)Special:Emailuser(&target=|\/|\/User:)(.*)/ ;
var talk=/Talk:/i ;

var imageRegex= /(^|\]* ]) */img ;
var imageRegexBracketCount = 2;

var categoryRegex= /\]* ]) */i ;
var categoryRegexBracketCount = 1;

var stubRegex= /stub|This .*-related article is a .*stub/im ;
var disambigRegex= /disambig|is a .*disambiguation.*page/im ;

var re; 
var splitLoc=window.location.href.split('/');
var thisWiki=splitLoc;
var protocol=splitLoc.split(':');
var titletail='/search/?title=';

// we're not set up for interwiki stuff yet - only affect en, commons 
// and wiktionary links

if (thisWiki=='commons.wikimedia.org') {
 re=/*:\/\/commons\.wikimedia\.org\/w(iki\/|\/index\.php\?title=)(*)/ ;
} else if (thisWiki=='en.wiktionary.org') {
  re= 
 /*:\/\/en\.wiktionary\.org\/w(iki\/|\/index\.php\?title=)(*)/ ;
} else {
  re=/*:\/\/en\.wikipedia\.org\/w(iki\/|\/index\.php\?title=)(*)/ ;
} 

var titlebase=protocol+'://'+thisWiki+titletail;     
var wikibase=protocol+'://'+thisWiki+'/';

var imageSources=new Array ();
imageSources.push(
   {active: false, wiki: thisWiki, thumb: true,  width: popupImageSize}, 
   {active: false, wiki: thisWiki, thumb: true,  width: 180}, // default
   {active: false, wiki: thisWiki, thumb: true,  width: 120}, // gallery
   {active: false, wiki: thisWiki, thumb: true,  width: 200}, // common?
   {active: false, wiki: thisWiki, thumb: true,  width: 210},
   {active: false, wiki: thisWiki, thumb: true,  width: 230},
   {active: false, wiki: thisWiki, thumb: true,  width: 250}, // common?
   {active: false, wiki: thisWiki, thumb: true,  width: 300},
   {active: false, wiki: thisWiki, thumb: false, width: 0} // no comma
);
if (thisWiki!='commons.wikimedia.org') {
  imageSources.push(
   {active: false, wiki: 'commons.wikimedia.org', 
     thumb: true,  width: popupImageSize},
   {active: false, wiki: 'commons.wikimedia.org', 
     thumb: true,  width: 180},
   {active: false, wiki: 'commons.wikimedia.org', 
     thumb: true,  width: 120},
   {active: false, wiki: 'commons.wikimedia.org', 
     thumb: false, width: 0} // no trailing comma
  );
}

// downloading images are put here
var imageArray=new Array();

// page caching
var gCachedPages = new Array ();
var gImageCache = new Array();
  


// FIXME what is this for?
var gImage=null; // global for image

// check to see if images are done with this timer
var popupImageTimer=null;

// misc debug messages
var popupDebug=null;

// These are for checkImages()
var counter=0;
var checkImagesTimer=null;
var loopcounter=0;

// ids change with each popup: popupImage0, popupImage1 etc
var popupImageId=0;

var kateBase='http://kohl.wikimedia.org/~kate/cgi-bin/count_edits' 
             + '?dbname=enwiki&user='

// for myDecodeURI
var decodeExtras = new Array ();
decodeExtras.push ( 
  {from: '%2C', to: ',' },
  {from: '_',   to: ' ' },
  {from: '%26',   to: '&' } // no ,
);

// for setPopupHTML - needed for timers and stuff
var popupHTMLTimers=new Array();
var popupHTMLLoopFunctions = new Array();

// FIXME - eliminate this
var redirCount=0;


var popupImagesToggleSize=true;
var popupImageSize=60;

// user-settable parameters and defaults
var popupDelay=null;            var dpopupDelay=0.5;
var popupFgColor=null;          var dpopupFgColor='#CCCCFF';
var popupBgColor=null;          var dpopupBgColor='#333399';
var removeTitles=null;          var dremoveTitles=true;
var imagePopupsForImages=null;  var dimagePopupsForImages=true;
var extraPageInfo = null;       var dextraPageInfo=true;
var simplePopups=null;          var dsimplePopups = false;
var downloadImages=null;        var ddownloadImages=true;
var popupPreviews=null;         var dpopupPreviews=true;

/////////////////////
// HTML GENERATION //
/////////////////////

// generate html for popup image
// <a id="popupImageLinkn"><img id="popupImagen">
// where n=popupImageId
function imageHTML(article) {
  var ret='';
  popupImageId++;
  ret+='<a id="popupImageLink' + popupImageId + '">';
  ret += '<img ' + // src="' + imgurl + '" ' +
    'width=' + popupImageSize + 
    ' align="right" valign="top" + id="popupImage' + popupImageId 
    + '"></img>';
  ret+='</a>';
  return ret;
};

function isInToc(a) {
  var obj = a;
  var i=0;
  do {obj = obj.parentNode; ++i; }
  while (obj.id != 'toc' && obj.nodeName != 'HTML');
  /* 
     log('traversed '+i+' elements,' +
     'arriving at obj.nodeName=' +obj.nodeName+
     ', obj.id=' + obj.id);
  */
  if (obj.nodeName == 'HTML') return false;
  return true;
}

function articleFromAnchor(a) {
  log('articleFromAnchor');
  var h=a.href;
  var article=null;
  log('h='+h);

  var contribs=contributions.exec(h);
  if (contribs != null) {
    article='User:'+contribs;
    return article;
  } 
  
  var email=emailuser.exec(h);
  if (email != null) {
    article='User:'+email;
    return article;
  } 

  // no more special cases to check --
  // hopefully it's not a disguised user-related page

  var m=re.exec(h);
  if(m===null) return null;
  article=m;
  return article;
};

// Generate html for whole popup
// this is ugly
function popupHTML (a) {

  var c=a.className;
  // if (c=='new') alert('new!');

  var article = articleFromAnchor(a);

  var hint=a.originalTitle;
  if (hint == '' || hint == null)
    hint = myDecodeURI(article);

  var html='';
 
  html +=imageHTML(article);

  var simplifyMainLink = true;

  var visibleMainLinkText=myDecodeURI(article);
  if ( simplifyMainLink ) { 
    var s= visibleMainLinkText.split('/');
    visibleMainLinkText = s;
    if (visibleMainLinkText == '' && s.length > 1) 
      {
        // shouldn't happen...
        visibleMainLinkText=s;
      }
  }

  html+='<b>';
  html+=titledWikiLink(article,
                       'view', 
                       visibleMainLinkText,
                       hint);
  html+='</b>';

  html+='<span id="popupImageStatus'+popupImageId+'"></span>';
  // Get rid of anchor now
  article=removeAnchor(article);

  if (userName(article) != null) {
    html += '<br>' + contribsLink(article, 'contribs');
    html += ' &sdot; ' + kateLink(article, 'count');
    html += ' &sdot; ' + emailLink(article, 'email');
  }

  html += '<br>' + wikiLink(article, 'edit', 'edit');
  var ta=articleFromTalkPage(article);
  if (ta != null) html +='|' + 
                    wikiLink(article, 'edit&section=new', 'new');
  html += ' &sdot; ' + wikiLink(article, 'history', 'history');
  html += ' &sdot; ' + wikiLink(article, 'unwatch', 'un') + '|';
  html += wikiLink(article, 'watch', 'watch');
  var t=talkPage(article);
  if (t != null) html += ' &sdot; ' + 
                   '<b>' + wikiLink(t, 'view', 'talk') + '</b>' +
                   '|' + wikiLink(t, 'edit', 'edit') +
                   '|' + wikiLink(t, 'edit&section=new', 'new');
  if (ta != null) html +=' &sdot; ' + 
                    '<b>' + wikiLink(ta, 'view', 'article') + '</b>' +
                    '|' + wikiLink(ta, 'edit', 'edit');
 
  html += '<br>' + specialLink(article, 'Whatlinkshere', 'whatLinksHere');
  html += ' &sdot; ' + specialLink(article, 'Recentchangeslinked', 'relatedChanges');

  html += '<span id="popupWarnRedir' + popupImageId + '"></span>';
  html += '<span id="popupGubbins' + popupImageId + '"></span>';
  html += '<span id="popupPreview' + popupImageId + '"></span>';
  return html;
}; 

/////////////////
// DOWNLOADING //
/////////////////

//////////////
//
// downloader
//
//

function downloader(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.callbackFunction = null;

  if (this.http) {
    // public
    this.send = this.http.send;
    this.abort = this.http.abort;
  }
  else this.http=false;
};

new downloader();

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

downloader.prototype.runCallback = function () {
  this.callbackFunction(this);
};

downloader.prototype.getData = function () { 
  if(!this.http) return;
  return this.http.responseText;
};

downloader.prototype.setTarget = function () { 
  if(!this.http) return;
  this.http.open("GET", this.url, true); 
};

downloader.prototype.start=function () { 
  // alert('downloader instance got told to start()');
  if(!this.http) return;  
  return this.http.send(null);
};

downloader.prototype.getReadyState=function () {
  if(!this.http) return;
  return this.http.readyState;
};

function newDownload(url, id, callback) {
  var d=new downloader(url);
  d.id=id;
  d.setTarget();
  var f = function () {
    if (d.getReadyState() == 4)
    { d.data=d.getData(); callback(d);}
  };
  d.setCallback(f);
  return d;//d.start();
};

function fakeDownload(url,id,callback,data) {
  var d=newDownload(url,callback);
  d.id=id;
  d.data=data;
  return callback(d);
};

function startDownload(url, id, callback) {
  var d=newDownload(url, id, callback);
  d.start();
};

//
//
// downloader
//
//////////////


// Schematic for a getWiki call
//
//   getWiki->-getPageWithCaching
//                    |
//       false        |          true
// getPage<-->-onComplete(a fake download)
//   \.
//     (async)->addPageToCache(download)->-onComplete(download)

function getWiki(wikipage, onComplete) {
  log('getWiki, wikipage='+wikipage); 
  var url = titlebase + removeAnchor(wikipage) + '&action=raw';
  return getPageWithCaching(url, onComplete);
};

// check cache to see if page exists

function getPageWithCaching(url, onComplete) {
  log ('getPageWithCaching, url='+url);
  var i=findInPageCache(url);
  if (i > -1) {
    return fakeDownload(url, popupImageId, onComplete, gCachedPages.data);
  }
  return getPage(url, onComplete);
};

function getPage(url, onComplete) {
  log ('getPage, url='+url);

  var callback= function (d) { 
    log('callback from getPage activated');
    addPageToCache(d); onComplete(d) } ;
  return startDownload(url, popupImageId, callback);
};

function findInPageCache(url) {
  for (var i=0; i<gCachedPages.length; ++i) {
    if (url==gCachedPages.url) { 
      log('found url at index '+i);
      return i;
    }
  }
  log('did not find url='+url);

  return -1; 
};


function cachedPage (url,data) {
  this.url=url;
  this.data=data;
};

function addPageToCache(download) {
  log ('addPageToCache, page.url='+download.url);
  /*
    log ('addPageToCache now calling findInPageCache');
    if (findInPageCache(download) > -1) { 
    log ('not adding - already there'); return; 
    }
    log ('new page - adding');
  */
  var page = new cachedPage(download.url, download.data);
  return gCachedPages.push(page);
};

/*
  var gCurrentDownload = null;

  function abortCurrentDownload(download) {
  if (gCurrentDownload) {
  try { gCurrentDownload.abort(); }
  catch (anerror) {return 'could not abort download object';}
  }
  return true;
  }
*/


/////////////////////
// LINK GENERATION //
/////////////////////

function wikiLink(article, action, text) {
  var prehint=null;

  switch (action) {
  case 'edit':             prehint = 'Edit ';                 break;
  case 'history':          prehint = 'Show history for ';     break;
  case 'unwatch':          prehint = 'Stop watching ';        break;
  case 'watch':            prehint = 'Watch ';                break;
  case 'view':             prehint = 'Go to ';                break;
  case 'edit&section=new': prehint = 'Start a new topic on '; break;
  default: true;
  }
 
  var hint;
  if (prehint != null) hint=prehint + myDecodeURI(article);
  else prehint = myDecodeURI(article + '&action=' + action);
  return titledWikiLink(article, action, text, hint);
};

function titledWikiLink(article, action, text, title) {
  var base = titlebase +  article;
  var url=base;
  // no need to add action&view, and this confuses anchors
  if (action != 'view') url = base + '&action=' + action;

  var hint;
  if (title == null || title == '')
    hint = ''
      else 
        hint = 'title="' + title + '"'; 

  return '<a href="' + url + '" ' + hint + '>' + text + '</a>';
};

function specialLink(article, specialpage, text) {
  var base = titlebase +  'Special:'+specialpage;
  var url = base + '&target=' + article;
  var prehint=null;
  switch (specialpage) {
  case 'Whatlinkshere': 
    prehint='Show the articles which link to '; break;
  case 'Recentchangeslinked': 
    prehint='Show recent changes in articles related to '; break;
  case 'Contributions': 
    prehint='Show the contributions made by '; break;
  case 'Emailuser': 
    prehint='Email '; break;
  }
  var hint;
  if (prehint != null) hint = prehint + myDecodeURI(article);
  else hint = myDecodeURI(specialpage+':'+article) ;
  return '<a href="' + url + '" title="' + hint + '">' + text + '</a>';
};

function redirLink(redirMatch) { /* NB redirMatch is in wikiText */
  log ('making redirLink for page ]');
  var ret=titledWikiLink(myEncodeURI(redirMatch), 
                         'view', 
                         myDecodeURI(redirMatch), 
                         'Bypass redirect');
  return ret;
};

function doNotRedirLink(redirPage, linkText, hintText) { /* NB redirPage is in wikiText */
  log('making doNotRedirLink for page(?) ]');
  var ret=titledWikiLink(myEncodeURI(redirPage), 
                         'edit', 
                         linkText,
                         hintText);
  return ret;
};



function contribsLink(article, text) {
  return specialLink(userName(article), 'Contributions', text);
};

function emailLink(article, text) {
  return specialLink(userName(article), 'Emailuser', text);
};

function kateLink(article, text) {
  var uN=myDecodeURI(userName(article));
  return '<a href="' + kateBase + uN + '" title="'
    + 'Count the contributions made by ' + uN + '">' + text + '</a>';
};

////////////////////////////
// MANIPULATION FUNCTIONS //
////////////////////////////

function upcaseFirst(str) {
  return str.toUpperCase() + str.substring(1);
};


function formatBytes(num) {
  ret = (num > 949) ? (Math.round(num/100)/10+'kB') :
    (num +'&nbsp;bytes' ) ;
  return ret;
}

function getPageInfo(data) {
  var numImages = countImages(data);
  var numLinks = countLinks(data);
  var numCategories = countCategories(data);
  var stats='c. ';
  stats += formatBytes(data.length);
  stats += ', ';
  stats +=numLinks + '&nbsp;wikiLink' + ((numLinks!=1)?'s, ':', ');
  stats +=numImages + '&nbsp;image' + ((numImages!=1)?'s, ':', ');
  stats +=numCategories + '&nbsp;categor' + ((numCategories!=1)?'ies':'y');
  var pageInfo=''; 
  if (isStub(data)) pageInfo+='stub, ';
  if (isDisambig(data)) pageInfo += 'disambig, ';
  if (pageInfo != '' ) 
    pageInfo = upcaseFirst(pageInfo);
  return pageInfo + stats;
};     

function getValidImageFromWikiText(wikiText) {
  var imagePage=null;
  // nb in imageRegex we're interested in the second bracketed expression 
  // this may change if the regex changes :-(
  //var match=imageRegex.exec(wikiText);
  var matched=null;
  var match;
  while ( match = imageRegex.exec(wikiText)) {
    /* now find a sane image name - exclude templates by seeking { */
    var m = match;
    log('is '+m+' a valid name for an image?');
    if ( isValidImageName(m) ) { matched=m; 
    log('yes!'); 
    break;}
    log('no...');
  } 
  imageRegex.lastIndex=0;
  if (!matched) return null;
  if (matched >= 'a' && matched <= 'z') {
    // upcase first character if ascii
    matched = upcaseFirst(matched);
  }
  imagePage='Image:'+matched;
  return imagePage;
};

function countLinks(wikiText) { 
  // this could be improved!
  return wikiText.split('[[').length - 1;
};

// if N = # matches, n = # brackets, then
// String.split(regex) intersperses the N+1 split elements
// with Nn other elements. So total length is
// L= N+1 + Nn = N(n+1)+1. So N=(L-1)/(n+1).

function countImages(wikiText) {
  return (wikiText.split(imageRegex).length - 1) / 
    (imageRegexBracketCount + 1);
};

function countCategories(wikiText) {
  return (wikiText.split(categoryRegex).length - 1) /
    (categoryRegexBracketCount + 1);
};


function talkPage(article) {
  if (article.indexOf('Talk:') > -1 || article.indexOf('talk:') > -1 ) 
    return null;

  var i=article.indexOf(':');
  if (i == -1) return 'Talk:'+article;
  else return article.substring(0,i)+'_talk:' + article.substring(i+1);
};

function articleFromTalkPage(talkpage) {
  var i=talkpage.indexOf('Talk:');
  var j=talkpage.indexOf('_talk:');
  if ( i == -1 && j  == -1 ) 
    return null;
  if ( i > -1 ) return talkpage.substring(i+5);
  return talkpage.split('_talk:').join(':');
};

function userName(article) {
  var i=article.indexOf('User');
  var j=article.indexOf(':');
  if  (i != 0 || j < -1) return null;
  var k=article.indexOf('/');
  if (k==-1) return article.substring(j+1);
  else return article.substring(j+1,k);
};

function stripNamespace(article) {
  // this isn't very sophisticated 
  // it just removes everything up to the final :
  var list = article.split(':');
  return list;
};

function imagePathComponent(article) {
  if (isImage(article)) {
    var stripped=stripNamespace(article);
    var forhash=myDecodeURI(stripped).split(' ').join('_');
    var hash=md5_hex(forhash);
    var pathcpt=hash.substring(0,1) + '/' + hash.substring(0,2) + '/';
    return pathcpt;
  }
  else return null;
};

function getImageUrlStart(wiki) { // this returns a trailing slash
  switch (wiki) {
    case 'en.wikipedia.org':
      return 'http://upload.wikimedia.org/wikipedia/en/';
    case 'commons.wikimedia.org':
      return 'http://upload.wikimedia.org/wikipedia/commons/';
    case 'en.wiktionary.org':
      return 'http://en.wiktionary.org/upload/en/';
    default: // unsupported - take a guess
      var lang=wiki.split('.');
      return 'http://' + wiki + '/upload/' + lang +'/';
  }
}



function imageURL(img, wiki) {
  if (popupDebug > 10) alert ('imageURL\n\nimg=' + img + '\nwiki='+wiki);
  var imgurl=null;
  if (isImage(img)) {
    var pathcpt = imagePathComponent(img);
    var stripped=stripNamespace(img);
    imgurl=getImageUrlStart(wiki) + pathcpt + stripped;
  }
  return imgurl;
};

function imageThumbURL(img, wiki, width) {
  // 
  // eg http://upload.wikimedia.org/wikipedia/en/thumb/6/61/ 
  //           Rubiks_cube_solved.jpg/120px-Rubiks_cube_solved.jpg

  var imgurl=null;
  if (isImage(img)) {
    var pathcpt = imagePathComponent(img);
    var stripped=stripNamespace(img);
    imgurl=getImageUrlStart(wiki) +  "thumb/"
      + pathcpt + stripped + '/' + width +"px-" + stripped;
  }
  return imgurl;
};


// (a) myDecodeURI (first standard decodeURI, then exceptions)
// (b) change spaces to underscores
// (c) encodeURI (just the straight one, no exceptions)

function wikiMarkupToAddressFragment (str) { // for images
  var ret = myDecodeURI(str);
  ret = ret.split(' ').join('_');
  ret = encodeURI(ret);
  return ret;
};


function addressFragmentToWikiMarkup (str) { 
  // seemingly, not :( the inverse of wikiMarkupToAddressFragment

  log ('addressFragmentToWikiMarkup\nstr='+str);
  var ret = myDecodeURI(str);
  /*   ret = ret.split('_').join(' '); */
  /*   ret = myEncodeURI(str); */
  log('addressFragmentToWikiMarkup\nret='+ret);
  return ret;
};


function myDecodeURI (str) {
  var ret=decodeURI(str);
  for (var i=0; i<decodeExtras.length; ++i) {
    var from=decodeExtras.from;
    var to=decodeExtras.to;
    ret=ret.split(from).join(to);
  }
  log ('myDecodeURI: ' +str+ ' to ' +ret);
  return ret;
};

function myEncodeURI (str) {
  log ('myEncodeURI: str='+str);
  var ret=str;
  ret=encodeURI(ret);
  log ('           : after encodeURI, ret=' +ret);
  for (var i=0; i<decodeExtras.length; ++i) {
    var from=decodeExtras.from;
    var to=decodeExtras.to;
    ret=ret.split(to).join(from);
  }
  log ('           : after decodeExtras, ret='+ret);
  return ret;
};

function removeAnchor(article) {
  // is there a #? if not, we're done
  var i=article.indexOf('#');
  if (i == -1) return article;

  // head#tail
  var head = article.substring(0,i);
  var tail = article.substring(i+1);

  return head;
};

///////////
// TESTS //
///////////

function isStub(data) { return stubRegex.test(data); }
function isDisambig(data) { return disambigRegex.test(data); } 

function isValidImageName(str){ // extend as needed...
  return ( str.split('{').length == 1 );
};

function isInNamespace(article, namespace) {
  var i=article.indexOf(namespace+':');
  var j=article.indexOf(namespace+'_talk:');
  if  (i == -1 && j == -1) return false;
  return true;
};

function isImage(thing) {
  return isInNamespace(thing, 'Image');
};

function isImageOk(img)
{ 
  // IE test
  if (!img.complete)
    return false;

  // gecko test
  if (typeof img.naturalWidth != "undefined" && img.naturalWidth == 0)
    return false;

  // No other way of checking: assume it's ok.
  return true;
};

function anchorContainsImage(a) {
  // iterate over children of anchor a
  // see if any are images
  if (a===null) return false;
  kids=a.childNodes;
  for (var i=0; i<kids.length; ++i) {
    if (kids.nodeName=='IMG') return true;
  }
  return false;
};

/////////////
// ACTIONS //
/////////////

var imageCache = new Array ();

function loadThisImage (image) {

  if (!downloadImages) return;
  
  var msg = '';
  msg += 'loadThisImage; image=' + image;
  msg += '\nimagePathComponent(image) = ' + imagePathComponent;
  var stripped=stripNamespace(image);
  var forhash=myDecodeURI(stripped).split(' ').join('_');
  var hash=md5_hex(forhash);
  var pathcpt=hash.substring(0,1) + '/' + hash.substring(0,2) + '/';
  msg +='\n\nbreakdown:\n stripped==stripNamespace(image)='+stripped;
  msg +='\nforhash=myDecodeURI(stripped).split(" ").join("_")='+forhash;
  msg +='\nhash=md5_hex(forhash)-' +hash;
  msg +='\npathcpt='+pathcpt;
 
  if (!isValidImageName(image)) return false;

  if(popupDebug != null)
    alert(msg);
 
  msg='List of urls:\n';
    
  var imageUrls=new Array();
  for (var i=0; i<imageSources.length; ++i) {

    var url;

    if (imageSources.thumb) 
      url=imageThumbURL(image, imageSources.wiki, imageSources.width);
    else 
      url=imageURL(image, imageSources.wiki);
    
    for (var j=0; j<gImageCache.length; ++j) {
      if (url == gImageCache) return loadThisImageAtThisUrl(image, url);
    }

    imageUrls.push(url);
  }
 
  msg='imageUrls:\n';
  for (var i=0; i<imageUrls.length; ++i) {
    var url = imageUrls;
    imageSources.active=false;
 
    msg += '\n'+url; 

    imageArray=new Image();
    imageArray.src=url;
  }
  //myalert(msg); 
  if (popupDebug) alert (msg);

  if (popupImageTimer != null) {
    clearInterval(popupImageTimer);
    counter=0;
  }
  gImage=image;
  popupImageTimer=setInterval("checkImages()", 250);
  return;
};


function loadThisImageAtThisUrl(image, url) {
  //myalert('loading "best" image:\n'+url);
  gImage=image;
  imageArray = new Array();
  imageArray = new Image();
  imageArray.src=url;
  if (popupImageTimer != null) {
    clearInterval(popupImageTimer);
    counter=0;
  }
  popupImageTimer=setInterval("checkImages()", 250);
  return;
}


function loadImages(article) {
  if(! isImage(article) ) return;
  if (popupDebug) alert('loadImages, article='+article);
  return loadThisImage(article);
};

function setPopupHTML (str, elementId, popupId) {
  if (typeof popupId === 'undefined') popupId = popupImageId;
  var popupElement=
    document.getElementById(elementId+popupId);
  var timer;

  if (typeof popupHTMLTimers == 'undefined') {
    timer=null;
  }
  else {
    timer=popupHTMLTimers;
  }

  if (popupElement != null) {
    if(timer) clearInterval(timer);
    popupHTMLTimers=null;
    popupElement.innerHTML=str;
    log('setPopupElement found the '+elementId+popupId+ ' element' +
        '\nstr='+str+
        '\npopupElement.innerHTML=' + popupElement.innerHTML);
    return true;
  } else {
    log('setPopupElement did not find the '+elementId+popupId+ ' element' +
        '\nstr='+str);
    var loopFunction=function() { setPopupHTML(str,elementId,popupId);}
    popupHTMLLoopFunctions = loopFunction;
    if (!timer) {
      var doThis = 'popupHTMLLoopFunctions()';
      popupHTMLTimers = setInterval(doThis, 600);
    }
  }
};


function setImageStatus(str, id) {
  return setPopupHTML(str, 'popupImageStatus', id);
};

function setPopupTrailer(str,id) {
  return setPopupHTML(str, 'popupGubbins', id);}

function checkImages() {

  if (checkImagesTimer!=null) {
    clearInterval(checkImagesTimer);
    checkImagesTimer=null;
    if (loopcounter > 10); {loopcounter=0; return;}
    loopcounter++;
  } else counter++;

  var status =  ( counter % 2 ) ? ':' : '.' ;
  setImageStatus(status);

  if (counter > 100) {counter = 0; clearInterval(popupImageTimer);}

  var popupImage=null;
  popupImage=document.getElementById("popupImage"+popupImageId);
  if (popupImage == null) {
    // this doesn't seem to happen any more in practise for some reason
    // still, I'll leave it in
    checkImagesTimer=setInterval("checkImages()",333);
    return;
  }
 
  // get the first image to successfully load
  // and put it in the popupImage
  for(var i = 0; i < imageArray.length; ++i) {
    if(isImageOk(imageArray)) {
      // stop all the gubbins, assign the image and return

      clearInterval(popupImageTimer);

      if(isImage(gImage)) {
        popupImage.src=imageArray.src;
        imageSources.active=true;
        // should we check to see if it's already there? maybe...
        gImageCache.push(imageArray.src); 
        //myalert('gImageCache='+gImageCache.join('\n'));

        setPopupImageLink(gImage, imageSources.wiki);
        stopImagesDownloading();
      }

      setImageStatus('');

      // reset evil nonconstant globals
      delete imageArray; imageArray=new Array();
      popupImageTimer=null;

      counter=0;
      loopcounter=0;

      return popupImage.src; 
    }
  }
};

function stopImagesDownloading() {
  gImage=null;
  if (imageArray == null) return null;
  var i;
  for (i=0; i<imageArray.length; ++i) {
    //imageArray.src=''; // this is a REALLY BAD IDEA
    delete imageArray;
    //imageArray = new Image();
  }
  imageArray = new Array ();
  return i;
};

function toggleSize() {
  var imgContainer=this;
  if (!imgContainer) { alert('imgContainer is null :/'); return;}
  img=imgContainer.firstChild;
  if (!img) { alert('img is null :/'); return;}
  var msg=''; 
  for (var i=0; i<imgContainer.childNodes.length; ++i)
    msg += '\nimgContainer.childNodes.width=' + 
      imgContainer.childNodes.width;
  if (!img.style.width || img.style.width=='')
    img.style.width='100%'; 
  else img.style.width=''; // popupImageSize+'px';
};

function setPopupImageLink (img, wiki) {
  if( wiki === null || img === null ) return null;
 
  var a=document.getElementById("popupImageLink"+popupImageId);
  if (a === null) return null; 

  var linkURL = imageURL(img, wiki); 
  if (linkURL != null) {
    if (popupImagesToggleSize) {
      a.onclick=toggleSize;
      a.title='Toggle image size';
    } else {
      a.href=linkURL;
      a.title='Open full-size image';
    }
  }
  return linkURL;
};

function setupTooltips() {
  var anchors=document.getElementsByTagName('A');
  // alert(anchors.length + 'anchors');
  var s='';
 
  if (removeTitles==null) removeTitles=dremoveTitles;

  for (var i=0; i<anchors.length; ++i)
    {
      var a=anchors;
      var h=a.href;
      var contribs=contributions.exec(h);
      var email=emailuser.exec(h);
      var exc=exceptions.exec(h);
      var m=re.exec(h);
      if (
          (! isInToc(a)) &&
          (contribs != null || (exc == null && m != null) )
          ) {
        a.onmouseover=mouseOverWikiLink;
        a.onmouseout= mouseOutWikiLink;
        a.onclick= killPopup;
        if (removeTitles) {
          a.originalTitle=a.title;
          a.title='';
        }
      }
    }
};


//////////////
// THINGIES //
//////////////


// How the URLs for images in the popup come about

//   loadPreviewImage 
//          |                                  
//       getWiki                                
//          |<----------------see other schematic for details 
//    insertPreviewImage      (insertPreviewImage = onComplete)
//          |
//          |            insertPreviewImage gets a wikiText fragment from 
//          |                       the wikiText downloaded by getWiki
//          |                                   
//           
//       |                                      
//       |                     mouseOverWikiLink  (gets an "address fragment",       
//       |                            |            no processing needed)
//       \->-loadThisImage---<----loadImages    
//                 |                            
//           -->--hopefully valid image urls


var currentLink=null;

function mouseOverWikiLink() {
  // FIXME: should not generate the HTML until the delay has elapsed,
  //        and then popup immediately. Can be a CPU hog otherwise.
 
  /* // good idea? dunno
     if ( typeof o3_showingsticky != "undefined" && o3_showingsticky != 0 ) {
     return;
     }
  */

  var a=this;

  if (a==currentLink) return;
  else currentLink=a;

  var html = popupHTML(a);
  var article=articleFromAnchor(a); 

  if (popupImageTimer != null) {
    clearInterval(popupImageTimer);
    counter=0;
  }

  if (popupDelay==null) popupDelay=dpopupDelay;
  if (popupFgColor==null) popupFgColor=dpopupFgColor;
  if (popupBgColor==null) popupBgColor=dpopupBgColor;
  if (downloadImages==null) downloadImages=ddownloadImages;

  log('running overlib now');

  var setmaxwidth = function () { over.style.maxWidth = '300px'; }
  registerHook("createPopup", setmaxwidth, FAFTER);



  overlib(html, 
          STICKY,
          /* MOUSEOFF, */ 
          WRAP, 
          CELLPAD, 5, 
          OFFSETX, 2, 
          OFFSETY, 2, 
          DELAY, popupDelay*1000,
          FGCOLOR, popupFgColor, 
          BGCOLOR, popupBgColor);
  
  if (simplePopups===null)
    simplePopups = dsimplePopups;

  if(simplePopups) return;

  if (imagePopupsForImages===null) 
    imagePopupsForImages = dimagePopupsForImages;

  var previewImage=true;

  gImage=null;

  if ( 
      isImage(article) && 
      ( imagePopupsForImages || ! anchorContainsImage(a) )
      ) 
    {
      loadImages(article);
    }
  else if (!isImage(article) && previewImage) {
    redirCount=0;
    loadPreviewImage(article);
  }
};

function loadPreviewImage(article) {

  /* var imgStatus; 
     imgStatus='';
     for (var i=0; i<redirCount+2; ++i) imgStatus += '.';
     setImageStatus(imgStatus); */
  var ret=getWiki(article, insertPreviewImage);

  return ret;
};


function loadPreviewImageFromRedir(redirPage, redirMatch) {
  /* redirMatch is a regex match */
  var target = redirMatch;
  var trailingRubbish=redirMatch;
  log ('found a first redirect to ' + target);
  ++redirCount;
  var warnRedir='<br>Redirects to ';
  warnRedir += redirLink(target);
  if (trailingRubbish.length > 0) {
    log ('found trailing rubbish: in redirect to\n' 
         + target + '\n\n' + trailingRubbish);
    warnRedir += ', '+formatBytes(trailingRubbish.length);
    warnRedir += '&nbsp;' + 
      doNotRedirLink(redirPage, 'hidden', 'Show text hidden after #redirect]');
  }
  setPopupHTML(warnRedir, 'popupWarnRedir');
  return loadPreviewImage(myEncodeURI(target));
};

function extractChunk(str, header, breakChar) {
  if (str.indexOf(header) != 0) return null;
  if (!breakChar) return str.substring(header.length);
  var findChar=str.indexOf(breakChar);
  if (findChar==-1) return str.substring(header.length);
  return str.substring(header.length, findChar);
}

function urlToWikiPage (url) {
  log ('urlToWikiPage\nurl='+url);
  var urlFragment=null;

  if (!urlFragment) urlFragment=extractChunk(url, titlebase, '&');
  if (!urlFragment) urlFragment=extractChunk(url, wikibase, '?');

  if (!urlFragment) return null;
  
  return addressFragmentToWikiMarkup(urlFragment);

}

function insertPreviewImage(download) {
  log('starting insertPreviewImage');
  if (download.id != popupImageId) {
    log('download.id='+download.id
        +' does not match popupImageId='+popupImageId);
    return;
  }

  var wikiText=download.data;

  log ('considering '+wikiText.length+' bytes of data, starting\n'
       + wikiText.substring(0,50) );

  var redirectRegex= /^*redirect*\]*)\]\]\s*(.*)/i ;
  var redirMatch = redirectRegex.exec(wikiText);

  if (redirMatch && redirCount==0) { 
    return loadPreviewImageFromRedir(urlToWikiPage(download.url), redirMatch);
  } else redirCount=0;

  log('not a redirect');

  // setImageStatus(''); // this seems redundant
  
  if (extraPageInfo===null) extraPageInfo=dextraPageInfo;

  if (extraPageInfo) {
    log ('getting extraPageInfo');
    var pgInfo=getPageInfo(wikiText);
    log ('got '+pgInfo);
    setPopupTrailer('<br>' + pgInfo);
  }

  var imagePage=getValidImageFromWikiText(wikiText);
  if(imagePage) {
    log ('found imagePage='+imagePage);
    // loadThisImage expects an "address fragment"
    imagePage = wikiMarkupToAddressFragment(imagePage); 
    loadThisImage(imagePage);
  }
  else log('no image found');
   
  if (popupPreviews===null) popupPreviews=dpopupPreviews;
  if (popupPreviews) {popupPreview(download);}

  log ('done insertPreviewImage');
  // myalert(gMsg); gMsg='';
};

function popupPreview(download) {
// FIXME: horizonal rules should be skipped
// FIXME: get rid of html tagsx
  var data=download.data; // .substring(0,2000); // that's silly
  var datum=new Array();
  datum.push(data);
  // try to remove templates
  data=data.replace(RegExp('(*|)*', 'g'), '');
  datum.push(data);
  // tables are bad, too
  data=data.replace(RegExp('\\|(|\\|)*\\|', 'g'), '');
  datum.push(data);

  // images are a nono
  // who says regexes aren't fun?
  // this ain't so good, try it on ]
  // i think we should match:
  // ] where ....... is consists of repetitions of any of:
  // (i)    )* ]]
  // (ii)   [ then not [
  // (iii)  not 
  // (iv)   ] then not ]
  var imagedetector
    ='\\s*image\\s*:(]*\\]\\]|]|]|\\]])*\\]\\]';
  var crudeImageRegex = RegExp(imagedetector, 'gi');
                              
  data=data.replace(crudeImageRegex, '');

  // chunks of italic text? you crazy, man?
  // Fails on ]
  // now works on ]

  var italicChunkRegex = 
    new RegExp("((^|\\n)\\s*:*\\s*''(|'''|'){0,30}(.|\\n)*''*\\n)*"
               , 'g');

  
  data=data.replace(italicChunkRegex, '');

  // we simply *can't* be doing with horizontal rules right now
  data=data.replace(RegExp('^-{4,}','mg'),'');

  // or html tables // this doesn't cope with embedded tables
  // for example, ] (yucky source)
  //data=data.replace(RegExp('<table*>(||<|</|'+
  //'</t|</ta|'+
  //'</tab|</tabl|</table)*</table>','gi'),
  //'');

  // may this is good enough?
  data=data.replace(RegExp('<table>(|\\n)*</table>\\n\\n', 'gi'),
                    '');
                    

  // or those pesky html tags
  data=data.replace(RegExp('<*>','g'),'');


  // replace __TOC__, __NOTOC__ and whatever else there is
  // this'll probably do
  data=data.replace(RegExp('^__*__ *$', 'gm'),'');

  // dont't be givin' me no subsequent paragraphs, either, you hear me?
  stuff=(RegExp('^\\s*(|\\n)*')).exec(data);
  if (stuff) 
    data = stuff;  
             

  // sentences after the third are RIGHT OUT.
  // note: 1 set of parens here needed to make the slice work
  data = data.split(RegExp('(+*\\s)','g'));
  var numSentences = 3;
  data = data.slice(0,2*numSentences); 
  data=data.join('');
  
  data=data.replace(RegExp('^\\s*'), '');
  
  datum.push(data);

  // myalert(datum.join('\n===\n'));

  var newhtml=wiki2html(data); // needs livepreview
  //newhtml = '<table width="260"><tr><td>' + newhtml + 
  //'</td></tr></table>';
  
  setPopupHTML('<hr>'+newhtml, 'popupPreview');
};


var stopPopupTimer=null;


function fuzzyCursorOff(fuzz) {
  if (!over) return null;
  var left = parseInt(over.style.left);
  var top = parseInt(over.style.top);
  var right = left + (over.offsetWidth >= parseInt(o3_width) ? over.offsetWidth : parseInt(o3_width));
  var bottom = top + (over.offsetHeight >= o3_aboveheight ? over.offsetHeight : o3_aboveheight);
  
  if (o3_x < left-fuzz || o3_x > right+fuzz || o3_y < top-fuzz || o3_y > bottom + fuzz) return true;
  
  return false;
}

// seems that fuzzyCursorOff should precede mouseOutWikiLink in the source
// or sometimes during page loads, errors are generated


function mouseOutWikiLink () {
  // document.title += '!';
  if (fuzzyCursorOff(5)) { 
    if (stopPopupTimer) {
      clearInterval(stopPopupTimer); 
      stopPopupTimer=null; 
    }
    killPopup(); 
    return;
  }
  if (!stopPopupTimer) 
    stopPopupTimer=setInterval("mouseOutWikiLink()", 500);
};

function killPopup() {
  // o3_showingsticky should be defined in overlib.js
  //if ( typeof o3_showingsticky != "undefined" && o3_showingsticky == 0 ) {
  cClick();
  currentLink=null;
  // abortCurrentDownload();
  stopImagesDownloading();
  //}
  return true; // preserve default action (eg from onclick)
};

////////////////////////////////////////////////////////////////////
// Run things
////////////////////////////////////////////////////////////////////

if (window.addEventListener)
  window.addEventListener("load",setupTooltips,false);
else if (window.attachEvent) 
  window.attachEvent("onload",setupTooltips);
else {
  window._old_ABCD_onload = window.onload;
  window.onload = function() {
    window._old_ABCD_onload();
    setupTooltips();
  }
}