jquery.fancytree.js

	 */
	evalOption: function(optionName, node, nodeObject, treeOptions, defaultValue) {
		var ctx, res,
			tree = node.tree,
			treeOpt = treeOptions[optionName],
			nodeOpt = nodeObject[optionName];

		if( $.isFunction(treeOpt) ) {
			ctx = { node: node, tree: tree, widget: tree.widget, options: tree.widget.options };
			res = treeOpt.call(tree, {type: optionName}, ctx);
			if( res == null ) {
				res = nodeOpt;
			}
		} else {
			res = (nodeOpt != null) ? nodeOpt : treeOpt;
		}
		if( res == null ) {
			res = defaultValue;  // no option set at all: return default
		}
		return res;
	},
	/** Convert a keydown or mouse event to a canonical string like 'ctrl+a',
	 * 'ctrl+shift+f2', 'shift+leftdblclick'.
	 *
	 * This is especially handy for switch-statements in event handlers.
	 *
	 * @param {event}
	 * @returns {string}
	 *
	 * @example

	switch( $.ui.fancytree.eventToString(event) ) {
		case "-":
			tree.nodeSetExpanded(ctx, false);
			break;
		case "shift+return":
			tree.nodeSetActive(ctx, true);
			break;
		case "down":
			res = node.navigate(event.which, activate, true);
			break;
		default:
			handled = false;
	}
	if( handled ){
		event.preventDefault();
	}
	 */
	eventToString: function(event) {
		// Poor-man's hotkeys. See here for a complete implementation:
		//   https://github.com/jeresig/jquery.hotkeys
		var which = event.which,
			et = event.type,
			s = [];

		if( event.altKey ) { s.push("alt"); }
		if( event.ctrlKey ) { s.push("ctrl"); }
		if( event.metaKey ) { s.push("meta"); }
		if( event.shiftKey ) { s.push("shift"); }

		if( et === "click" || et === "dblclick" ) {
			s.push(MOUSE_BUTTONS[event.button] + et);
		} else {
			if( !IGNORE_KEYCODES[which] ) {
				s.push( SPECIAL_KEYCODES[which] || String.fromCharCode(which).toLowerCase() );
			}
		}
		return s.join("+");
	},
	/** Write message to console if debugLevel >= 1
	 * @param {string} msg
	 */
	info: function(msg){
		/*jshint expr:true */
		($.ui.fancytree.debugLevel >= 1) && consoleApply("info", arguments);
	},
	/* @deprecated: use eventToString(event) instead.
	 */
	keyEventToString: function(event) {
		this.warn("keyEventToString() is deprecated: use eventToString()");
		return this.eventToString(event);
	},
	/** Return a wrapped handler method, that provides `this.super`.
	 *
	 * @example
		// Implement `opts.createNode` event to add the 'draggable' attribute
		$.ui.fancytree.overrideMethod(ctx.options, "createNode", function(event, data) {
			// Default processing if any
			this._super.apply(this, arguments);
			// Add 'draggable' attribute
			data.node.span.draggable = true;
		});
	 *
	 * @param {object} instance
	 * @param {string} methodName
	 * @param {function} handler
	 */
	overrideMethod: function(instance, methodName, handler){
		var prevSuper,
			_super = instance[methodName] || $.noop;

		// context = context || this;

		instance[methodName] = function() {
			try {
				prevSuper = this._super;
				this._super = _super;
				return handler.apply(this, arguments);
			} finally {
				this._super = prevSuper;
			}
		};
	},
	/**
	 * Parse tree data from HTML <ul> markup
	 *
	 * @param {jQueryObject} $ul
	 * @returns {NodeData[]}
	 */
	parseHtml: function($ul) {
		// TODO: understand this:
		/*jshint validthis:true */
		var classes, className, extraClasses, i, iPos, l, tmp, tmp2,
			$children = $ul.find(">li"),
			children = [];

		$children.each(function() {
			var allData, lowerCaseAttr,
				$li = $(this),
				$liSpan = $li.find(">span:first", this),
				$liA = $liSpan.length ? null : $li.find(">a:first"),
				d = { tooltip: null, data: {} };

			if( $liSpan.length ) {
				d.title = $liSpan.html();

			} else if( $liA && $liA.length ) {
				// If a <li><a> tag is specified, use it literally and extract href/target.
				d.title = $liA.html();
				d.data.href = $liA.attr("href");
				d.data.target = $liA.attr("target");
				d.tooltip = $liA.attr("title");

			} else {
				// If only a <li> tag is specified, use the trimmed string up to
				// the next child <ul> tag.
				d.title = $li.html();
				iPos = d.title.search(/<ul/i);
				if( iPos >= 0 ){
					d.title = d.title.substring(0, iPos);
				}
			}
			d.title = $.trim(d.title);

			// Make sure all fields exist
			for(i=0, l=CLASS_ATTRS.length; i<l; i++){
				d[CLASS_ATTRS[i]] = undefined;
			}
			// Initialize to `true`, if class is set and collect extraClasses
			classes = this.className.split(" ");
			extraClasses = [];
			for(i=0, l=classes.length; i<l; i++){
				className = classes[i];
				if(CLASS_ATTR_MAP[className]){
					d[className] = true;
				}else{
					extraClasses.push(className);
				}
			}
			d.extraClasses = extraClasses.join(" ");

			// Parse node options from ID, title and class attributes
			tmp = $li.attr("title");
			if( tmp ){
				d.tooltip = tmp; // overrides <a title='...'>
			}
			tmp = $li.attr("id");
			if( tmp ){
				d.key = tmp;
			}
			// Translate hideCheckbox -> checkbox:false
			if( $li.attr("hideCheckbox") ){
				d.checkbox = false;
			}
			// Add <li data-NAME='...'> as node.data.NAME
			allData = _getElementDataAsDict($li);
			if( allData && !$.isEmptyObject(allData) ) {
				// #507: convert data-hidecheckbox (lower case) to hideCheckbox
				for( lowerCaseAttr in NODE_ATTR_LOWERCASE_MAP ) {
					if( allData.hasOwnProperty(lowerCaseAttr) ) {
						allData[NODE_ATTR_LOWERCASE_MAP[lowerCaseAttr]] = allData[lowerCaseAttr];
						delete allData[lowerCaseAttr];
					}
				}
				// #56: Allow to set special node.attributes from data-...
				for(i=0, l=NODE_ATTRS.length; i<l; i++){
					tmp = NODE_ATTRS[i];
					tmp2 = allData[tmp];
					if( tmp2 != null ) {
						delete allData[tmp];
						d[tmp] = tmp2;
					}
				}
				// All other data-... goes to node.data...
				$.extend(d.data, allData);
			}
			// Recursive reading of child nodes, if LI tag contains an UL tag
			$ul = $li.find(">ul:first");
			if( $ul.length ) {
				d.children = $.ui.fancytree.parseHtml($ul);
			}else{
				d.children = d.lazy ? undefined : null;
			}
			children.push(d);
//            FT.debug("parse ", d, children);
		});
		return children;
	},
	/** Add Fancytree extension definition to the list of globally available extensions.
	 *
	 * @param {object} definition
	 */
	registerExtension: function(definition){
		_assert(definition.name != null, "extensions must have a `name` property.");
		_assert(definition.version != null, "extensions must have a `version` property.");
		$.ui.fancytree._extensions[definition.name] = definition;
	},
	/** Inverse of escapeHtml().
	 *
	 * @param {string} s
	 * @returns {string}
	 */
	unescapeHtml: function(s){
		var e = document.createElement("div");
		e.innerHTML = s;
		return e.childNodes.length === 0 ? "" : e.childNodes[0].nodeValue;
	},
	/** Write warning message to console.
	 * @param {string} msg
	 */
	warn: function(msg){
		consoleApply("warn", arguments);
	}
});

}(jQuery, window, document));