branch for universe

[helm.git] / components / cic_unification / cicMkImplicit.ml

diff --git a/components/cic_unification/cicMkImplicit.ml b/components/cic_unification/cicMkImplicit.ml
new file mode 100644 (file)
index 0000000..3667922
--- /dev/null
+++ b/components/cic_unification/cicMkImplicit.ml
@@ -0,0 +1,122 @@
+(* Copyright (C) 2004, HELM Team.
+ * 
+ * This file is part of HELM, an Hypertextual, Electronic
+ * Library of Mathematics, developed at the Computer Science
+ * Department, University of Bologna, Italy.
+ * 
+ * HELM is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ * 
+ * HELM is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with HELM; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+ * MA  02111-1307, USA.
+ * 
+ * For details, see the HELM World-Wide-Web page,
+ * http://cs.unibo.it/helm/.
+ *)
+
+(* $Id$ *)
+
+(* identity_relocation_list_for_metavariable i canonical_context         *)
+(* returns the identity relocation list, which is the list [1 ; ... ; n] *)
+(* where n = List.length [canonical_context]                             *)
+(*CSC: ma mi basta la lunghezza del contesto canonico!!!*)
+let identity_relocation_list_for_metavariable ?(start = 1) canonical_context =
+  let rec aux =
+   function
+      (_,[]) -> []
+    | (n,None::tl) -> None::(aux ((n+1),tl))
+    | (n,_::tl) -> (Some (Cic.Rel n))::(aux ((n+1),tl))
+  in
+   aux (start,canonical_context)
+
+(* Returns the first meta whose number is above the *)
+(* number of the higher meta.                       *)
+let new_meta metasenv subst =
+  let rec aux =
+   function
+      None, [] -> 1
+    | Some n, [] -> n
+    | None, n::tl -> aux (Some n,tl)
+    | Some m, n::tl -> if n > m then aux (Some n,tl) else aux (Some m,tl)
+  in
+  let indexes = 
+    (List.map (fun (i, _, _) -> i) metasenv) @ (List.map fst subst)
+  in
+  1 + aux (None, indexes)
+
+(* let apply_subst_context = CicMetaSubst.apply_subst_context;; *)
+(* questa o la precedente sembrano essere equivalenti come tempi *)
+let apply_subst_context _ context = context ;;
+
+let mk_implicit metasenv subst context =
+  let newmeta = new_meta metasenv subst in
+  let newuniv = CicUniv.fresh () in
+  let irl = identity_relocation_list_for_metavariable context in
+    (* in the following mk_* functions we apply substitution to canonical
+    * context since we have the invariant that the metasenv has already been
+    * instantiated with subst *)
+  let context = apply_subst_context subst context in
+  ([ newmeta, [], Cic.Sort (Cic.Type newuniv) ;
+    (* TASSI: ?? *)
+    newmeta + 1, context, Cic.Meta (newmeta, []);
+    newmeta + 2, context, Cic.Meta (newmeta + 1,irl) ] @ metasenv,
+   newmeta + 2)
+
+let mk_implicit_type metasenv subst context =
+  let newmeta = new_meta metasenv subst in
+  let newuniv = CicUniv.fresh () in
+  let context = apply_subst_context subst context in
+  ([ newmeta, [], Cic.Sort (Cic.Type newuniv);
+    (* TASSI: ?? *)
+    newmeta + 1, context, Cic.Meta (newmeta, []) ] @metasenv,
+   newmeta + 1)
+
+let mk_implicit_sort metasenv subst =
+  let newmeta = new_meta metasenv subst in
+  let newuniv = CicUniv.fresh () in
+  ([ newmeta, [], Cic.Sort (Cic.Type newuniv)] @ metasenv, newmeta)
+  (* TASSI: ?? *)
+
+let n_fresh_metas metasenv subst context n = 
+  if n = 0 then metasenv, []
+  else 
+    let irl = identity_relocation_list_for_metavariable context in
+    let context = apply_subst_context subst context in
+    let newmeta = new_meta metasenv subst in
+    let newuniv = CicUniv.fresh () in
+    let rec aux newmeta n = 
+      if n = 0 then metasenv, [] 
+      else
+        let metasenv', l = aux (newmeta + 3) (n-1) in 
+       (* TASSI: ?? *)
+        (newmeta, context, Cic.Sort (Cic.Type newuniv))::
+        (newmeta + 1, context, Cic.Meta (newmeta, irl))::
+        (newmeta + 2, context, Cic.Meta (newmeta + 1,irl))::metasenv',
+        Cic.Meta(newmeta+2,irl)::l in
+    aux newmeta n
+      
+let fresh_subst metasenv subst context uris = 
+  let irl = identity_relocation_list_for_metavariable context in
+  let context = apply_subst_context subst context in
+  let newmeta = new_meta metasenv subst in
+  let newuniv = CicUniv.fresh () in
+  let rec aux newmeta = function
+      [] -> metasenv, [] 
+    | uri::tl ->
+       let metasenv', l = aux (newmeta + 3) tl in 
+         (* TASSI: ?? *)
+        (newmeta, context, Cic.Sort (Cic.Type newuniv))::
+         (newmeta + 1, context, Cic.Meta (newmeta, irl))::
+         (newmeta + 2, context, Cic.Meta (newmeta + 1,irl))::metasenv',
+          (uri,Cic.Meta(newmeta+2,irl))::l in
+    aux newmeta uris
+