X-Git-Url: http://git.nguyen.vg/gitweb/?p=tatoo.git;a=blobdiff_plain;f=src%2Ftree.ml;h=9e6c71ca61a4a0dd8a3ba8d6c088810e2d5916cb;hp=97711dd60f6e0662c306c1ecc306e8eb8e0c1831;hb=1947a98f419c2bf50378fed783406818b010c60e;hpb=75375a8bc02893080745ab38768b7ee48f5c4153

diff --git a/src/tree.ml b/src/tree.ml
index 97711dd..9e6c71c 100644
--- a/src/tree.ml
+++ b/src/tree.ml
@@ -18,7 +18,8 @@
 module NodeKind =
   struct
     type t =
-        Document | Element | Text | Comment | Attribute | ProcessingInstruction | Node
+      Document | Element | Text | Comment | Attribute
+    | ProcessingInstruction | Node
 
     let to_string =
       function
@@ -112,4 +113,15 @@ sig
   (** [by_preorder t i] returns the node with preorder [i]
   *)
   val print_node : Format.formatter -> node -> unit
+
+  val is_first_child : t -> node -> bool
+  val is_next_sibling : t -> node -> bool
+  val prev_sibling : t -> node -> node
+ (** [prev_sibling t n] returns the previous_sibling of node [n] in tree [t].
+      Returns [nil] if [n] is the first child of a node.
+  *)
+  val parent_of_first : t -> node -> node
+ (** [parent_of_first t n] returns the parent of node [n] in tree [t] .
+      Returns [nil] if [n] isn't the first child of a node.
+  *)
 end