===================================================================
RCS file: /cvs/mandoc/roff.c,v
retrieving revision 1.369
retrieving revision 1.370
diff -u -p -r1.369 -r1.370
--- mandoc/roff.c	2020/01/19 18:02:00	1.369
+++ mandoc/roff.c	2020/02/27 01:43:52	1.370
@@ -1,4 +1,4 @@
-/*	$Id: roff.c,v 1.369 2020/01/19 18:02:00 schwarze Exp $ */
+/*	$Id: roff.c,v 1.370 2020/02/27 01:43:52 schwarze Exp $ */
 /*
  * Copyright (c) 2008-2012, 2014 Kristaps Dzonsons <kristaps@bsd.lv>
  * Copyright (c) 2010-2015, 2017-2020 Ingo Schwarze <schwarze@openbsd.org>
@@ -1112,6 +1112,59 @@ roff_node_delete(struct roff_man *man, struct roff_nod
 		roff_node_delete(man, n->child);
 	roff_node_unlink(man, n);
 	roff_node_free(n);
+}
+
+int
+roff_node_transparent(struct roff_node *n)
+{
+	if (n == NULL)
+		return 0;
+	if (n->type == ROFFT_COMMENT || n->flags & NODE_NOPRT)
+		return 1;
+	switch (n->tok) {
+	case ROFF_ft:
+	case ROFF_ll:
+	case ROFF_mc:
+	case ROFF_po:
+	case ROFF_ta:
+	case MDOC_Db:
+	case MDOC_Es:
+	case MDOC_Sm:
+	case MDOC_Tg:
+	case MAN_DT:
+	case MAN_UC:
+	case MAN_PD:
+	case MAN_AT:
+		return 1;
+	default:
+		return 0;
+	}
+}
+
+struct roff_node *
+roff_node_child(struct roff_node *n)
+{
+	for (n = n->child; roff_node_transparent(n); n = n->next)
+		continue;
+	return n;
+}
+
+struct roff_node *
+roff_node_prev(struct roff_node *n)
+{
+	do {
+		n = n->prev;
+	} while (roff_node_transparent(n));
+	return n;
+}
+
+struct roff_node *
+roff_node_next(struct roff_node *n)
+{
+	do {
+		n = n->next;
+	} while (roff_node_transparent(n));
+	return n;
 }
 
 void