var XMLParser = {
    parse: function(documentElement){
        return new XMLParser.Element(documentElement);
    }
};

XMLParser.NODE_TYPE = {
    ELEMENT_NODE: 1,
    ATTRIBUTE_NODE: 2,
    TEXT_NODE: 3,
    CDATA_SECTION_NODE: 4,
    ENTITY_REFERENCE_NODE: 5,
    ENTITY_NODE: 6,
    PROCESSING_INSTRUCTION_NODE: 7,
    COMMENT_NODE: 8,
    DOCUMENT_NODE: 9,
    DOCUMENT_TYPE_NODE: 10,
    DOCUMENT_FRAGMENT_NODE: 11,
    NOTATION_NODE: 12
};


// XMLParser.Element
XMLParser.Element = function(documentElement){
//	if (!documentElement || !documentElement.nodeName){return null;}
    this['$'+documentElement.nodeName] = new XMLParser.Node(documentElement);
}

XMLParser.Element.prototype = {
    // example: path('nodeA->nodeB->0->nodeC')
    path: function(path){
        var nodes = path.split('->');
        var element = this;
        for (var i = 0; i < nodes.length; i++){
            if (nodes[i].match('[^0-9]')){
                element = element['$'+nodes[i]];
            }else{
                element = element[nodes[i]];
            }
            if (!element){return null;}
        }
        return element;
    },
    dump: function(space_num){
        space_num = (space_num) ? space_num : 0;
        var space = '';
        for (var i = 0; i < space_num; i++){
            space += '-';
        }

        var result = [];
        for (var property in this){
            if (this[property] instanceof Array){
                for (var i = 0; i < this[property].length; i++){
                    result.push(this._dump(this[property][i], space));
                    result = result.concat(this[property][i].dump(space_num+1));
                }
            }else if ((this[property] instanceof XMLParser.Node) && property != 'parent'){
                result.push(this._dump(this[property], space));
                result = result.concat(this[property].dump(space_num+1));
            }
        }
        return result;
    },
    dumpHTML: function(){
        var result = this.dump();
        for (var i = 0; i < result.length; i++){
            result[i] = result[i].replace(/</g, '&lt;');
            result[i] = result[i].replace(/>/g, '&gt;');
        }
        return result.join('<br />');
    },
    _dump: function(node, space){
        var result = '';
        result += space + '[' + node.name + ']';
        if (node.value){
            result += '="' + node.value + '"';
        }
        if (node.attributes.length > 0){
            result += ' (';
            for (var i = 0; i < node.attributes.length; i++){
                result += (i == 0) ? '' : ', ';
                result += node.attributes[i].name + '="' + node.attributes[i].value + '"';
            }
            result += ')';
        }
        return result;
    }
};


// XMLParser.Node
XMLParser.Node = function (node, parent){
    this.parent = (parent instanceof XMLParser.Node) ? parent : null;
    this.attributes = node.attributes;
    this.name = node.nodeName;
    this.value = '';

    for (var i = 0; i < node.childNodes.length; i++){
        var n = node.childNodes[i];
        switch (n.nodeType){
        case XMLParser.NODE_TYPE.TEXT_NODE :
        case XMLParser.NODE_TYPE.CDATA_SECTION_NODE :
            var value = n.nodeValue;
            if (n.nodeType == XMLParser.NODE_TYPE.TEXT_NODE){
                value = value.replace(/[\r\n\t]/g, '');
            }
            if (value){
                this.value = value;
            }
            break;
        default:
            var name = '$'+n.nodeName;
            if (this[name]){
                if (!(this[name] instanceof Array)){
                    var b = this[name];
                    this[name] = [];
                    this[name].push(b)
                }
                this[name].push(new XMLParser.Node(n, this));
            }else{
                this[name] = new XMLParser.Node(n, this);
            }
            break;
        }
    }
};

XMLParser.Node.prototype = {
    getParent: function(){
        return this.parent;
    },
    getAttribute: function(name){
        return this.attributes.getNamedItem(name);
    },
    getAttributes: function(){
        return this.attributes;
    },
    path: function(path){
        return XMLParser.Element.prototype.path.apply(this, arguments);
    },
    dump: function(){
        return XMLParser.Element.prototype.dump.apply(this, arguments);
    },
    dumpHTML: function(){
        return XMLParser.Element.prototype.dumpHTML.apply(this, arguments);
    },
    _dump: function(){
        return XMLParser.Element.prototype._dump.apply(this, arguments);
    }
};