selectTopLevelGroup.jsx

#target "Illustrator"

var doc = app.documents[0];
var topG = getTopGroup(doc.groupItems);
alert("top level group:"+topG.length+ "\r" +
	"PageItems:" + doc.pageItems.length + "\r" +
	"PathItems:" + doc.pathItems.length + "\r" +
	"CompoundPathItems:" + doc.compoundPathItems.length + "\r" +
	"GroupItems:" + doc.groupItems.length + "\r" +
	"Selection:" + doc.selection.length);

/**
 * get top level group items
 * @param {Array} group Array of GroupItem
 * @returns {Array} tgr Array of top level GroupItem
 */
function getTopGroup (group) {
	var tgr=[];
	for (var i=0; i < group.length; i++) {
		//parent is Layer
		if(group[i].parent.typename == "Layer"){
			//group is formed with single path item
			if(group[i].pathItems.length == 1){
				tgr.push(group[i]);
			}
			//group is formed with compound path item
			if(group[i].compoundPathItems.length == 1){
				tgr.push(group[i]);
			}
			//group include any page items(textframe, pathitem)
			else if(group[i].pageItems.length != 0){
				tgr.push(group[i]);
				}
			}
		}
	return tgr;
}