source

#target photoshop 

/*--------------------------------------------------------
   
Config

-------------------------------------------------------*/

var originalRulerUnits = preferences.rulerUnits;
preferences.rulerUnits = Units.PIXELS;
 
/*--------------------------------------------------------
 	
Functions
 	
-------------------------------------------------------*/

function doCheck() {
    if(!documents.length) {
        alert('There are no documents open.');
        return; 
    }
 }
 
 function traverseLayer(doc) {

    var layers = doc.layers;

    // not very efficient for multilevel layers
    for(var i = 0; i < layers.length; i++) {
        
        // if group
        if(layers[i].typename == "LayerSet") {
            
            var name = layers[i].name;

            // filter by group name
            if(name.indexOf("@") > 0) {

                for(var j = 0; j < layers[i].layers.length; j++) {

                    getLayerAttribute(layers[i].layers[j], name);
 
                }
            }            
        }
    }
 }

function getLayerAttribute(layer, name) {
   
   // write down the attributes to XML
   var s = "\t<pos name=\"" + name.substring(0, name.length - 1) + ".png\" x=\"" + layer.bounds[0].value + "\" y=\"" + layer.bounds[1].value + "\"></pos>\n";
   str += s.toString();
}

 
/*--------------------------------------------------------
 	
Start
 	
--------------------------------------------------------*/


var doc          = app.activeDocument;
var docWidth     = doc.width.value;
var docHeight    = doc.height.value;
var docFilePath  = doc.fullName.path + "/";
var docFileName  = doc.name.match(/([^\.]+)/)[1];
var docXMLName   = docFilePath.toString().match(/([^\.]+)/)[1] + docFileName + ".xml";
var str          = "<item btn=\"btn" + docFileName +".png\" cover=\""+ docFileName + ".png\">\n";

doCheck();

traverseLayer (doc);

// create a reference to a file for output
var csvFile = new File(docXMLName);

// open the file, write the data, then close the file
csvFile.open('w');
csvFile.writeln(str + "</item>");
csvFile.close();
preferences.rulerUnits = originalRulerUnits;

// Confirm that operation has completed
alert("XML Complete!""\n" + docXMLName);