🚀 go-pugleaf

From the Flatten All Masks script that ships with CS4:

///////////////////////////////////////////////////////////////////////////////
// Function: hasLayerMask
// Usage: see if there is a raster layer mask
// Input: <none> Must have an open document
// Return: true if there is a vector mask
///////////////////////////////////////////////////////////////////////////////
function hasLayerMask() {
	var hasLayerMask = false;
	try {
		var ref = new ActionReference();
		var keyUserMaskEnabled = app.charIDToTypeID( 'UsrM' );
		ref.putProperty( app.charIDToTypeID( 'Prpr' ), keyUserMaskEnabled );
		ref.putEnumerated( app.charIDToTypeID( 'Lyr ' ), app.charIDToTypeID( 'Ordn' ), app.charIDToTypeID( 'Trgt' ) );
		var desc = executeActionGet( ref );
		if ( desc.hasKey( keyUserMaskEnabled ) ) {
			hasLayerMask = true;
		}
	}catch(e) {
		hasLayerMask = false;
	}
	return hasLayerMask;
}

///////////////////////////////////////////////////////////////////////////////
// Function: hasVectorMask
// Usage: see if there is a vector layer mask
// Input: <none> Must have an open document
// Return: true if there is a vector mask
///////////////////////////////////////////////////////////////////////////////
function hasVectorMask() {
	var hasVectorMask = false;
	try {
		var ref = new ActionReference();
		var keyVectorMaskEnabled = app.stringIDToTypeID( 'vectorMask' );
		var keyKind = app.charIDToTypeID( 'Knd ' );
		ref.putEnumerated( app.charIDToTypeID( 'Path' ), app.charIDToTypeID( 'Ordn' ), keyVectorMaskEnabled );
		var desc = executeActionGet( ref );
		if ( desc.hasKey( keyKind ) ) {
			var kindValue = desc.getEnumerationValue( keyKind );
			if (kindValue == keyVectorMaskEnabled) {
				hasVectorMask = true;
			}
		}
	}catch(e) {
		hasVectorMask = false;
	}
	return hasVectorMask;
}

///////////////////////////////////////////////////////////////////////////////
// Function: hasFilterMask
// Usage: see if there is a Smart Filter mask
// Input: <none> Must have an open document
// Return: true if there is a Smart Filter mask
///////////////////////////////////////////////////////////////////////////////
function hasFilterMask() {
	var hasFilterMask = false;
	try {
		var ref = new ActionReference();
		var keyFilterMask = app.stringIDToTypeID("hasFilterMask");
		ref.putProperty( app.charIDToTypeID( 'Prpr' ), keyFilterMask);
		ref.putEnumerated( app.charIDToTypeID( 'Lyr ' ), app.charIDToTypeID( 'Ordn' ), app.charIDToTypeID( 'Trgt' ) );
		var desc = executeActionGet( ref );
		if ( desc.hasKey( keyFilterMask ) && desc.getBoolean( keyFilterMask )) {
			hasFilterMask = true;
		}
	}catch(e) {
		hasFilterMask = false;
	}
	return hasFilterMask;
}