Use a compound path as clipping mask?

Question

Hello,
I’m trying to use a complex compound path as a clipping mask, but it won’t work. I have narrowed down the problem a little in two smaller scripts described below.
Using a single path as clipping mask works very well:
var doc = app.documents.add();
var clipGroup = doc.groupItems.add();
var bgItem = clipGroup.pathItems.rectangle(200, 200, 200, 200);
bgItem.position = Array(200, 500);
bgItem.fillColor = doc.swatches[8].color;
var fgItem = clipGroup.pathItems.polygon(144, 288, 72.0, 7);
fgItem.position = Array(220, 480);
fgItem.fillColor = doc.swatches[7].color;
fgItem.zOrder(ZOrderMethod.BRINGTOFRONT);
clipGroup.clipped = true;
alert(clipGroup.clipped); // will alert true
But when trying the simplest form of a compound path, it’s not working:
var doc = app.documents.add();
var clipGroup = doc.groupItems.add();
var bgItem = clipGroup.pathItems.rectangle(200, 200, 200, 200);
bgItem.position = Array(200, 500);
bgItem.fillColor = doc.swatches[8].color;
var compoundItem = clipGroup.compoundPathItems.add();
var fgItem = compoundItem.pathItems.polygon(144, 288, 72.0, 7);
fgItem.position = Array(220, 480);
fgItem.fillColor = doc.swatches[7].color;
compoundItem.zOrder(ZOrderMethod.BRINGTOFRONT);
clipGroup.clipped = true;
alert(clipGroup.clipped); // will alert false
Using compound paths as clipping masks is really simple in the Illustrator GUI. So what am I missing here?
Help would be greatly appreciated.

Answer 1

The simplest way, I think, would be to set the white line work as an opacity mask on top of the tan circle. That is not a clipping mask, but does the same thing and it's much easier.
Otherwise, outline white strokes and "Unite" using pathfinder tool, then delete outside path (the circle), from the compound shape. That will leave the appropriate compound object to make the clipping mask: