static gboolean
prune_maybe (MuContainer *c)
{
MuContainer *cur;
for (cur = c->child; cur; cur = cur->next) {
if (cur->flags & MU_CONTAINER_FLAG_DELETE)
c = mu_container_remove_child (c, cur);
else if (cur->flags & MU_CONTAINER_FLAG_SPLICE)
c = mu_container_splice_children (c, cur);
}
g_return_val_if_fail (c, FALSE);
/* don't touch containers with messages */
if (c->msg)
return TRUE;
/* A. If it is an msg-less container with no children, mark it
* for deletion. */
if (!c->child) {
c->flags |= MU_CONTAINER_FLAG_DELETE;
return TRUE;
}
/* B. If the MuContainer has no Message, but does have
* children, remove this container but promote its
* children to this level (that is, splice them in to
* the current child list.)
*
* Do not promote the children if doing so would
* promote them to the root set -- unless there is
* only one child, in which case, do.
*/
if (c->child->next) /* ie., > 1 child */
return TRUE;
c->flags |= MU_CONTAINER_FLAG_SPLICE;
return TRUE;
}
static MuContainer*
prune_empty_containers (MuContainer *root_set)
{
MuContainer *cur;
mu_container_foreach (root_set,
(MuContainerForeachFunc)prune_maybe,
NULL);
/* and prune the root_set itself... */
for (cur = root_set; cur; cur = cur->next) {
if (cur->flags & MU_CONTAINER_FLAG_DELETE) {
root_set = mu_container_remove_sibling (root_set, cur);
} else if (cur->flags & MU_CONTAINER_FLAG_SPLICE) {
root_set = mu_container_splice_children (root_set, cur);
root_set = mu_container_remove_sibling (root_set, cur);
}
}
return root_set;
}