app.beginUndoGroup("Invert Shape Path");
var curComp = app.project.activeItem;
if(curComp != null && curComp instanceof CompItem){
    var selectedProps = curComp.selectedProperties;
    var propsNum = selectedProps.length;
    if(propsNum > 0){
        var targetShapeObj, verticesArray, inTangentsArray, outTangentsArray, shapeObj, curKeyIndex;
        for(var i = 0; i < propsNum; i++){
            if(selectedProps[i].matchName == "ADBE Vector Shape"){
                verticesArray = selectedProps[i].value.vertices.reverse();
                inTangentsArray = selectedProps[i].value.inTangents.reverse();
                outTangentsArray = selectedProps[i].value.outTangents.reverse();
                shapeObj = new Shape();
                shapeObj.vertices = verticesArray;
                shapeObj.inTangents = outTangentsArray;
                shapeObj.outTangents = inTangentsArray;
                if(selectedProps[i].numKeys > 0){
                    curKeyIndex = selectedProps[i].nearestKeyIndex(curComp.time);
                    selectedProps[i].setValueAtKey(curKeyIndex, shapeObj);
                } else {
                    selectedProps[i].setValue(shapeObj);
                }
            }
        }
    } else {
        alert("You need to select a shape path at least.", "Invert Shape Path");
    }
} else {
    alert("Select a composition first.", "Invert Shape Path");
}
app.endUndoGroup();