/*****************************************************
XWeb XParser 0.8

Browsers Supported
MSIE 6
Mozilla 1+
Firefox 0.8+

Online documentation at http://www.wdonline.com/javascript/xparser/
(c) 2004  Jeremy McPeak  jwmcpeak@gmail.com
*****************************************************/
function XParser(sFileName,bIsXml) {
    var oThis = this;
    this.title=this.link=this.description=this.enclosure=this.copyright=this.generator=this.modified=this.author=this.date=new XParserElement();
    this.onload = null;
    if (bIsXml) this.load(sFileName);
    else {
		var oReq = zXmlHttp.createRequest();
		oReq.onreadystatechange = function () {
			if (oReq.readyState == 4) {
	            // only if "OK"
				if (oReq.status == 200) {
                    oThis.load(oReq.responseXML.xml);
				}
			}
		};
		oReq.open("GET", sFileName, true);
		oReq.send(null);
    }
}

XParser.prototype.load = function (sXml) {
	var oXmlDom = zXmlDom.createDocument();
	oXmlDom.loadXML(sXml);
    this.error="";
	this.root = oXmlDom.documentElement;
	if (this.root ==null){
            this.error="This URL does not return valid content!";
            if (typeof this.onload == "function"){
		          this.onload();
		          return;
            }
    }
	this.isRss = (this.root.tagName.toLowerCase() == "rss");
	this.isRss1 = (this.root.tagName.toLowerCase() == "rdf:rdf");

      
	//this.isAtom = (this.root.tagName.toLowerCase() == "feed");
	this.type = "Atom";
	var oChannel=this.root;
	if(this.isRss1 || this.isRss){
      this.type = (this.isRss)?"RSS":"RDF";
      oChannel = this.root.getElementsByTagName("channel")[0];
    }
    
	for (var i = 0; i < oChannel.childNodes.length; i++) {
		var oNode = oChannel.childNodes[i];
		if (oNode.nodeType == 1) {
			switch (oNode.tagName.toLowerCase()) {
				//Shared Tags
				case "title":
					this.title = new XParserElement(oNode);
				break;
				case "link":
					if (this.isAtom) {
						if (oNode.getAttribute("rel").toLowerCase() == "alternate") {
							this.link = new XParserElement(oNode,oNode.getAttribute("href"));
						}
					} else {
						this.link = new XParserElement(oNode);
					}
				break;
				case "copyright":
					this.copyright = new XParserElement(oNode);
				break;
				case "generator":
					this.generator = new XParserElement(oNode);
				break;
					break;
				case "pubdate":
					this.date = new XParserElement(oNode);
				break;
				//RSS Tags
				case "description":
					this.description = new XParserElement(oNode);
				break;
				//RSS Tags
				case "content:encoded":
		        	this.description = new XParserElement(oNode);
				break;
				case "lastbuilddate":
					this.modified = new XParserElement(oNode);
				break;
				case "managingeditor":
					this.author = new XParserElement(oNode);
				break;
				//Atom Tags
				case "tagline":
					this.description = new XParserElement(oNode);
				break;/*
				case "modified":
					this.modified = new XParserElement(oNode);
				break;
				case "author":
					this.author = new XParserElement(oNode);
				break;*/
				default:
				break;
			}
		}
	}
   
	this.items = [];
	
	var oItems = null;
	if (this.isRss) {
		oItems = oChannel.getElementsByTagName("item");
	}
    else if (this.isRss1) {
		oItems = this.root.getElementsByTagName("item");
	}  else {
		try {
			oXmlDom.setProperty("SelectionNamespaces","xmlns:atom='http://purl.org/atom/ns#'");
			oItems = oXmlDom.selectNodes("/atom:feed/atom:entry");
		} catch (oError) {
			oItems = oChannel.getElementsByTagName("entry");
		}
	}

	for (var i = 0; i < oItems.length; i++) {
		this.items[i] = new XParserItem(oItems[i]);
	}
	
	if (typeof this.onload == "function")
		this.onload();
}

function XParserElement(oNode,sValue) {
	this.node = oNode || false;
	this.value = sValue || (this.node && this.node.text) || false;
	
	if (this.node) {
		this.attributes = [];
		var oAtts = this.node.attributes;
		for (var i = 0; i < oAtts.length; i++) {
			this.attributes[i] = new XParserAttribute(oAtts[i]);
		//	this.attributes[oAtts[i].nodeName] = new XParserAttribute(oAtts[i]);
    	}
	} else this.attributes = 0;
	
	this.isNull = (!this.node && !this.value && !this.attributes);
}

function XParserAttribute(oNode) {
	this.value = oNode.nodeValue;
}

function XParserItem(itemNode) {
	this.title=this.link=this.author=this.description=this.enclosure=this.date=new XParserElement();
	for (var i = 0; i < itemNode.childNodes.length; i++) {
		var oNode = itemNode.childNodes[i];
		if (oNode.nodeType == 1) {
			switch (oNode.tagName.toLowerCase()) {
				//Shared Tags
				case "title":
					this.title = new XParserElement(oNode);
				break;
				case "link":
					if (oNode.getAttribute("href"))
						this.link = new XParserElement(oNode,oNode.getAttribute("href"));
					else this.link = new XParserElement(oNode);
				break;
				case "author":
					this.author = new XParserElement(oNode);
				break;
				//RSS Tags
				case "description":
					this.description = new XParserElement(oNode);
					//if(!this.description.value){
                    //    this.description.value="no description";
                    //  }
				break;
				case "content:encoded":
					this.description = new XParserElement(oNode);
				break;
				case "pubdate":
					this.date = new XParserElement(oNode);
				break;
				//Atom Tags
				case "content":
					this.description = new XParserElement(oNode);
				break;
				case "issued":
					this.date = new XParserElement(oNode);
				break;
				//Extensions
				case "dc:date":
					this.date = new XParserElement(oNode);
				break;
				case "enclosure":
					if (oNode.getAttribute("url")){
						this.enclosure = new XParserElement(oNode,oNode.getAttribute("url"));}
					else {this.enclosure = new XParserElement(oNode);}
				break;
				default:
				break;
			}
		}
	}
}