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                /* reset "head" if that's what got pruned */
                if (prev == head)
                    head = curr;
                break;
            case PRUNE_CURRENT:
                /* discard current node */
                CssDiscardNode(curr);
                /* reset "head" if that's what got pruned */
                if (curr == head)
                    head = prev ? prev : next;
                /* backup and try again if possible */
                curr = prev ? prev : next;
                break;
            case PRUNE_NEXT:
                /* discard next node */
                CssDiscardNode(next);
                /* stay on current node, and try again */
                break;
            default:
                /* move ahead to next node */
                curr = next;