Get the number of active selections

[Polycontrast]

A photoshop document has multiple active selections on the canvas.

A square selection, around selection, and irregular selection for example.

Is it possible to alert the number of active selections at a given time?

[JJMack]

We knew what your were after.  I was just pointing out that your concept that Photoshop has multiple Active selection is not correct.  What the code does is have Photoshop map the active selection that is create a path like contour line on a map the Path will have Path items  that map each of the layer selected pixel areas.  A selection is a  singular thing its a map.   You can have many saved selections  there is only one active selection you have it or to don't and can be changed/modified.

[Kukurykus]

From last few requests I learnt users can't describe what they want, so they often mislead unintentionally. Knowing that I try to guess what the logic is covered below their "image".

[r-bin]

var file = new File(Folder.temp.fsName + "/" + "tmp");

var d = new ActionDescriptor();
executeAction(stringIDToTypeID("deleteMeasurements"), d, DialogModes.NO);

var d = new ActionDescriptor();
d.putEnumerated(stringIDToTypeID("source"), stringIDToTypeID("measurementSource"), stringIDToTypeID("selection"));
var list = new ActionList();
list.putEnumerated(stringIDToTypeID("measurementDataPoint"), stringIDToTypeID("Count"));
d.putList(stringIDToTypeID("dataPoints"), list);
var d = executeAction(stringIDToTypeID("recordMeasurements"), d, DialogModes.NO);

var d = new ActionDescriptor();
d.putPath(stringIDToTypeID("file"), file);
executeAction(stringIDToTypeID("exportMeasurements"), d, DialogModes.NO);

var d = new ActionDescriptor();
executeAction(stringIDToTypeID("deleteMeasurements"), d, DialogModes.NO);

file.open("r");

var s = file.read();

file.close();
file.remove();

alert(s);