Can not understand scripting function

[Azzam Masood]

Hello. I have a script containing a scriptlistener function. I am backtracking on this function to know what exactly it is doing. Unfortunately that is not going well. This is the function:

function makeSelectionFromRGB()
{
    var idsetd = charIDToTypeID( "setd" );
    var desc2237 = new ActionDescriptor();
    var idnull = charIDToTypeID( "null" );
    var ref970 = new ActionReference();
    var idChnl = charIDToTypeID( "Chnl" );
    var idfsel = charIDToTypeID( "fsel" );
    ref970.putProperty( idChnl, idfsel );
    desc2237.putReference( idnull, ref970 );
    var idT = charIDToTypeID( "T   " );
    var ref971 = new ActionReference();
    var idChnl = charIDToTypeID( "Chnl" );
    var idChnl = charIDToTypeID( "Chnl" );
    var idRGB = charIDToTypeID( "RGB " );
    ref971.putEnumerated( idChnl, idChnl, idRGB );
    desc2237.putReference( idT, ref971 );
    executeAction( idsetd, desc2237, DialogModes.NO );
}

What I know so far: It loads a selection from the RGB channel. Any ideas on what its doing, or how I may understand what it is doing? 

[Stephen_A_Marsh]

@Azzam Masood – You have answered your own question! :]

Converting the code using the Clean SL script with charID's converted to stringID's provides a different angle to view the code:

makeSelectionFromRGB();

function makeSelectionFromRGB() {
	var c2t = function (s) {
		return app.charIDToTypeID(s);
	};
	var s2t = function (s) {
		return app.stringIDToTypeID(s);
	};
	var descriptor = new ActionDescriptor();
	var reference = new ActionReference();
	var reference2 = new ActionReference();
	reference.putProperty( s2t( "channel" ), s2t( "selection" ));
	descriptor.putReference( c2t( "null" ), reference );
	reference2.putEnumerated( s2t( "channel" ), s2t( "channel" ), s2t( "RGB" ));
	descriptor.putReference( s2t( "to" ), reference2 );
	executeAction( s2t( "set" ), descriptor, DialogModes.NO );
}

Try this discussion:

https://community.adobe.com/t5/photoshop-ecosystem-discussions/action-manager-scripting/m-p/11160326