/**
 *  original script written by http://www.kryogenix.org/code/browser/searchhi/
 *  modified for purposes of MDLF
 */

searchhi = {
  highlightWord: function(node,word) {
    // Iterate into this nodes childNodes
    if (node.hasChildNodes) {
	    for (var hi_cn=0;hi_cn<node.childNodes.length;hi_cn++) {
		    searchhi.highlightWord(node.childNodes[hi_cn],word);
	    }
    }

    // And do this node itself
    if (node.nodeType == 3) { // text node
	    tempNodeVal = node.nodeValue.toLowerCase();
	    tempWordVal = word.toLowerCase();
	    if (tempNodeVal.indexOf(tempWordVal) != -1) {
		    var pn = node.parentNode;
		    // check if we're inside a "nosearchhi" zone
		    var checkn = pn;
		    while (checkn.nodeType != 9 && 
		    checkn.nodeName.toLowerCase() != 'body') { 
		    // 9 = top of doc
			    if (checkn.className.match(/\bnosearchhi\b/)) { return; }
			    checkn = checkn.parentNode;
		    }
		    if (pn.className != "searchword") {
			    // word has not already been highlighted!
			    var nv = node.nodeValue;
			    var ni = tempNodeVal.indexOf(tempWordVal);
			    // Create a load of replacement nodes
			    var before = document.createTextNode(nv.substr(0,ni));
			    var docWordVal = nv.substr(ni,word.length);
			    var after = document.createTextNode(nv.substr(ni+word.length));
			    var hiwordtext = document.createTextNode(docWordVal);
			    var hiword = document.createElement("span");
			    hiword.className = "searchword";
			    hiword.appendChild(hiwordtext);
			    pn.insertBefore(before,node);
			    pn.insertBefore(hiword,node);
			    pn.insertBefore(after,node);
			    pn.removeChild(node);
		    }
	    }
    }
  },

  campsiteSearchHighlight: function() {
    var ref = document.referrer;
    if (ref.indexOf('?') == -1) return;
    var qs = ref.substr(ref.indexOf('?')+1);
    var qsa = qs.split('&');
    for (var i=0;i<qsa.length;i++) {
	    var qsip = qsa[i].split('=');
      if (qsip.length == 1) continue;
      if (qsip[0] == 'f_search_keywords' || qsip[0] == 'q' || qsip[0] == 'p') {
		    var twords = qsip[1].replace(/^\+site:mdlf\.org\+/,'');
		    var wordstring = unescape(twords.replace(/\+/g,' '));
		    searchhi.process(wordstring);
      }
    }
  },

  process: function(wordstring) {
    if (!document.createElement || !document.getElementsByTagName) return;
    var words = wordstring.split(/\s+/);
    for (w=0;w<words.length;w++) {
	    searchhi.highlightWord(document.getElementsByTagName("body")[0],words[w]);
    }
  },

};