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[helm.git] / components / library / cicRecord.ml

diff --git a/components/library/cicRecord.ml b/components/library/cicRecord.ml
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+(* Copyright (C) 2004-2005, 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://helm.cs.unibo.it/
+ *)
+
+(* $Id$ *)
+
+let rec_ty uri leftno  = 
+  let rec_ty = Cic.MutInd (uri,0,[]) in
+  if leftno = 0 then rec_ty else
+    Cic.Appl (rec_ty :: (CicUtil.mk_rels leftno 0))
+
+let generate_one_proj uri params paramsno fields t i =
+ let mk_lambdas l start = 
+  List.fold_right (fun (name,ty) acc -> 
+    Cic.Lambda (Cic.Name name,ty,acc)) l start in
+ let recty = rec_ty uri paramsno in
+ let outtype = Cic.Lambda (Cic.Name "w'", CicSubstitution.lift 1 recty, t) in
+   (mk_lambdas params
+     (Cic.Lambda (Cic.Name "w", recty,
+       Cic.MutCase (uri,0,outtype, Cic.Rel 1, 
+        [mk_lambdas fields (Cic.Rel i)]))))
+
+let projections_of uri field_names =
+ let buri = UriManager.buri_of_uri uri in
+ let obj,ugraph = CicEnvironment.get_cooked_obj CicUniv.empty_ugraph uri in
+  match obj with
+     Cic.InductiveDefinition ([_,_,sort,[_,ty]],params,paramsno,_) ->
+      assert (params = []); (* general case not implemented *)
+      let leftparams,ty =
+       let rec aux =
+        function
+           0,ty -> [],ty
+         | n,Cic.Prod (Cic.Name name,s,t) ->
+            let leftparams,ty = aux (n - 1,t) in
+             (name,s)::leftparams,ty
+         | _,_ -> assert false
+       in
+        aux (paramsno,ty)
+      in
+      let fields =
+       let rec aux =
+        function
+           Cic.MutInd _, []
+         | Cic.Appl _,   [] -> []
+         | Cic.Prod (_,s,t), name::tl -> (name,s)::aux (t,tl)
+         | _,_ -> assert false
+       in
+        aux ((CicSubstitution.lift 1 ty),field_names)
+      in
+       let rec aux i =
+        function
+           Cic.MutInd _, []
+         | Cic.Appl _,   [] -> []
+         | Cic.Prod (_,s,t), name::tl ->
+            let p = generate_one_proj uri leftparams paramsno fields s i in
+            let puri = UriManager.uri_of_string (buri ^ "/" ^ name ^ ".con") in
+             (puri,name,p) ::
+               aux (i - 1)
+                (CicSubstitution.subst
+                  (Cic.Appl
+                    (Cic.Const (puri,[]) ::
+                      CicUtil.mk_rels paramsno 2 @ [Cic.Rel 1])
+                  ) t, tl)
+         | _,_ -> assert false
+       in
+        aux (List.length fields) (CicSubstitution.lift 2 ty,field_names)
+   | _ -> assert false