// $Id: toc.js,v 1.1 2006/04/03 21:53:15 nedjo Exp $

var InitLevel = 2;
var EndLevel = 4;

/* Function found on http://www.easy-reader.net/archives/2005/09/02/death-to-bad-dom-implementations/
   to fix our dear IE special view of DOM ¬¬ */
function createElementWithName(){}
(function(){
  try {
    var el=document.createElement( '<div name="foo">' );
    if( 'DIV'!=el.tagName ||
        'foo'!=el.name ){
      throw 'create element error';
    }
    createElementWithName = function( tag, name ){
      return document.createElement( '<'+tag+' name="'+name+'"></'+tag+'>' );
    }
  }catch( e ){
    createElementWithName = function( tag, name ){
      var el = document.createElement( tag );
      // setAttribute might be better here ?
      el.name = name;
      return el;
    }
  }
})();

function getElementsByClass(searchClass,node,tag) {
	var classElements = new Array();
	if ( node == null )
		node = document;
	if ( tag == null )
		tag = '*';
	var els = node.getElementsByTagName(tag);
	var elsLen = els.length;
	var pattern = new RegExp("(^|\\s)"+searchClass+"(\\s|$)");
	for (i = 0, j = 0; i < elsLen; i++) {
		if ( pattern.test(els[i].className) ) {
			classElements[j] = els[i];
			j++;
		}
	}
	return classElements;
}

function ProcessTocFor(parent, tocParent, level)
{
   if (level > EndLevel) 
     return;
   var tagname = 'h' + level;
   var tag;         
   var ol = document.createElement('ol');   
   var i = 0;
   tag = parent;
   while (tag = tag.nextSibling)
   {
     i++;     
     if (tag.tagName == parent.tagName)
        break;
     if (!tag.tagName || tag.tagName.toUpperCase() != tagname.toUpperCase())
        continue;
              
     if (tag) {
            var li = document.createElement('li');
            var link = document.createElement('a');
            link.setAttribute('href', '#toc-' + tagname + '-' + i);
            var span = document.createElement('span');
            span.appendChild(document.createTextNode(tag.firstChild.nodeValue));
            link.appendChild(span);
            li.appendChild(link);
            ol.appendChild(li);
            var anchor = createElementWithName('a','toc-' + tagname + '-' + i);            
            tag.appendChild(anchor);
            ProcessTocFor(tag,li,level + 1);
          }         
   }
   tocParent.appendChild(ol);
}

if (isJsEnabled()) {
  addLoadEvent(function() {
    /*var url = location.href;
    if (url.indexOf('node/') == -1) {
      return;
    }*/
    if (getElementsByClass("read-more").length)
      return;
    var nodeDiv;
    // Select all h3 elements
    divs = document.getElementsByTagName('div');
    for (var i = 0; div = divs[i]; ++i) {
      if (hasClass(div, 'node')) {
        nodeDiv = div;
        break;
      }
    }
    if (nodeDiv) {
      var currentLevel = InitLevel;
      
      do
      {
        var initTag = 'h' + currentLevel;            
        tags = nodeDiv.getElementsByTagName(initTag);
        currentLevel++;
      }
      while (!tags.length && currentLevel <= EndLevel);
      if (tags.length) {
        var tag;
        var toc = document.createElement('fieldset');
        legend = document.createElement('legend');
        var a = document.createElement('a');
        a.href = '#';
        a.onclick = function() {
          toggleClass(this.parentNode.parentNode, 'collapsed');
          if (!hasClass(this.parentNode.parentNode, 'collapsed')) {
            collapseScrollIntoView(this.parentNode.parentNode);
          }
          this.blur();
          return false;
        };
        a.appendChild(document.createTextNode('contents'));
        legend.appendChild(a);
        toc.appendChild(legend);
        addClass(toc, 'collapsible');
        var ol = document.createElement('ol');
        for (var i = 0; tag = tags[i]; ++i) {
          if (tag) {
            var li = document.createElement('li');
            var link = document.createElement('a');
            link.setAttribute('href', '#toc-' + i);
            var span = document.createElement('span');
            span.appendChild(document.createTextNode(tag.firstChild.nodeValue));
            link.appendChild(span);
            li.appendChild(link);
            ol.appendChild(li);
            var anchor = createElementWithName('a', 'toc-' + i);            
            tag.appendChild(anchor);
            ProcessTocFor(tag,li,currentLevel);
          }
        }
        toc.appendChild(ol);
        nodeDiv.insertBefore(toc, nodeDiv.firstChild);
        collapseEnsureErrorsVisible(toc);
      }
    }
  });
}