// Rule: MergeRootFrameLayout
//
// Description: Checks whether the root node of the XML document can be
//              replaced with a <merge /> tag.
//
// Conditions:
// - The node is the root of the document
// - The node is a FrameLayout
// - The node is fill_parent in both orientation *or* it has no layout_gravity
// - The node does not have a background nor a foreground

if (node.isRoot() && node.is("FrameLayout") && !node.'@android:background' &&
        !node.'@android:foreground' && ((node.isWidthFillParent() &&
                node.isHeightFillParent()) || !node.'@android:layout_gravity')) {
    analysis << "The root-level <FrameLayout/> can be replaced with <merge/>"
}