X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=helm%2Fmatita%2FmatitaMisc.mli;h=36318dc1fa0d2dbafa956c15e9336a92a902da3f;hb=7deafec4fd4b2eebf4d4061f21ee5c47bd15b062;hp=7a9ac0fc6f13aea57b535197b2302a88ce9c3abd;hpb=5ee4e9d9fbff19b7937459c5ad4652542ac1ccb8;p=helm.git

diff --git a/helm/matita/matitaMisc.mli b/helm/matita/matitaMisc.mli
index 7a9ac0fc6..36318dc1f 100644
--- a/helm/matita/matitaMisc.mli
+++ b/helm/matita/matitaMisc.mli
@@ -40,3 +40,32 @@ val append_phrase_sep: string -> string
 
 val strip_trailing_blanks: string -> string
 
+  (** Gdome.element of a MathML document whose rendering should be blank. Used
+  * by cicBrowser to render "about:blank" document *)
+val empty_mathml: Gdome.element
+
+exception History_failure
+
+type 'a memento
+
+class type ['a] history =
+  object ('b)
+    method add : 'a -> unit
+    method next : 'a        (** @raise History_failure *)
+    method previous : 'a    (** @raise History_failure *)
+    method load: 'a memento -> unit
+    method save: 'a memento
+  end
+
+  (** shell like history: new items added at the end of the history
+  * @param size maximum history size *)
+class shell_history : int -> [string] history
+
+  (** browser like history: new items added at the current point of the history
+  * @param size maximum history size
+  * @param first element in history (this history is never empty) *)
+class ['a] browser_history: ?memento:'a memento -> int -> 'a -> ['a] history
+
+  (** {2 db handling} *)
+val dbd_instance: unit -> Mysql.dbd
+