3 files changed, 16 insertions, 3 deletions
diff --git a/filter/data.c b/filter/data.c
index 87c438fc..56d746fd 100644
--- a/filter/data.c
+++ b/filter/data.c
@@ -336,7 +336,7 @@ clist_set_type(const struct f_tree *set, struct f_val *v)
   }
 }
 
-static int
+int
 clist_match_set(const struct adata *clist, const struct f_tree *set)
 {
   if (!clist)
@@ -357,7 +357,7 @@ clist_match_set(const struct adata *clist, const struct f_tree *set)
   return 0;
 }
 
-static int
+int
 eclist_match_set(const struct adata *list, const struct f_tree *set)
 {
   if (!list)
@@ -381,7 +381,7 @@ eclist_match_set(const struct adata *list, const struct f_tree *set)
   return 0;
 }
 
-static int
+int
 lclist_match_set(const struct adata *list, const struct f_tree *set)
 {
   if (!list)
diff --git a/filter/data.h b/filter/data.h
index c96856ce..051f0932 100644
--- a/filter/data.h
+++ b/filter/data.h
@@ -192,6 +192,7 @@ struct f_tree *f_new_tree(void);
 struct f_tree *build_tree(struct f_tree *);
 const struct f_tree *find_tree(const struct f_tree *t, const struct f_val *val);
 int same_tree(const struct f_tree *t0, const struct f_tree *t2);
+int tree_node_count(const struct f_tree *t);
 void tree_format(const struct f_tree *t, buffer *buf);
 void tree_walk(const struct f_tree *t, void (*hook)(const struct f_tree *, void *), void *data);
 
@@ -286,6 +287,10 @@ static inline int lclist_set_type(const struct f_tree *set)
 static inline int path_set_type(const struct f_tree *set)
 { return !set || set->from.type == T_INT; }
 
+int clist_match_set(const struct adata *clist, const struct f_tree *set);
+int eclist_match_set(const struct adata *list, const struct f_tree *set);
+int lclist_match_set(const struct adata *list, const struct f_tree *set);
+
 const struct adata *clist_filter(struct linpool *pool, const struct adata *list, const struct f_val *set, int pos);
 const struct adata *eclist_filter(struct linpool *pool, const struct adata *list, const struct f_val *set, int pos);
 const struct adata *lclist_filter(struct linpool *pool, const struct adata *list, const struct f_val *set, int pos);
diff --git a/filter/tree.c b/filter/tree.c
index 5da86b9d..97bf7dae 100644
--- a/filter/tree.c
+++ b/filter/tree.c
@@ -134,6 +134,14 @@ same_tree(const struct f_tree *t1, const struct f_tree *t2)
   return 1;
 }
 
+int
+tree_node_count(const struct f_tree *t)
+{
+  if (t == NULL)
+    return 0;
+
+  return 1 + tree_node_count(t->left) + tree_node_count(t->right);
+}
 
 static void
 tree_node_format(const struct f_tree *t, buffer *buf)