From 170f0003dedcd7c5a914dfcf47b196b5adc326e1 Mon Sep 17 00:00:00 2001
From: Stefano Zacchiroli <zack@upsilon.cc>
Date: Tue, 17 May 2005 13:08:11 +0000
Subject: [PATCH] bugfix: avoid duplicate entries while indexing (changed
 implementation so that sets are internally used everywhere instead of lists,
 which are now used only for implementing API)

---
 helm/ocaml/metadata/metadataExtractor.ml | 83 ++++++++++++++----------
 1 file changed, 48 insertions(+), 35 deletions(-)

diff --git a/helm/ocaml/metadata/metadataExtractor.ml b/helm/ocaml/metadata/metadataExtractor.ml
index f9a26637d..a1c24d9c6 100644
--- a/helm/ocaml/metadata/metadataExtractor.ml
+++ b/helm/ocaml/metadata/metadataExtractor.ml
@@ -241,25 +241,21 @@ let compute_metas term =
 let compute_type pos uri typeno (name, _, ty, constructors) =
   let consno = ref 0 in
   let type_metadata =
-    (UriManager.string_of_uriref (uri, [typeno]), name,
-    S.elements (compute_term pos ty))
+    (UriManager.string_of_uriref (uri, [typeno]), name, (compute_term pos ty))
   in
   let constructors_metadata =
     List.map
       (fun (name, term) ->
         incr consno;
         let uri = UriManager.string_of_uriref (uri, [typeno; !consno]) in
-        (uri, name, S.elements 
-                      (compute_term pos term)))
+        (uri, name, (compute_term pos term)))
       constructors
   in
   type_metadata :: constructors_metadata
 
 let compute_ind pos ~uri ~types =
   let idx = ref ~-1 in
-  List.concat 
-    (List.map 
-      (fun ty -> incr idx; compute_type pos uri !idx ty) types)
+  List.map (fun ty -> incr idx; compute_type pos uri !idx ty) types
 
 let compute (pos:position) ~body ~ty = 
   let type_metadata = compute_term pos ty in
@@ -276,16 +272,13 @@ let compute (pos:position) ~body ~ty =
         | _ -> uris)
       type_metadata StringSet.empty
   in
-  S.elements 
-    (S.union
-      (S.filter
-        (function
-          | `Obj (uri, _) when StringSet.mem uri uris -> false
-          | _ -> true)
-        body_metadata)
-      type_metadata)
-
-let compute_term start_pos term = S.elements (compute_term start_pos term)
+  S.union
+    (S.filter
+      (function
+        | `Obj (uri, _) when StringSet.mem uri uris -> false
+        | _ -> true)
+      body_metadata)
+    type_metadata
 
 let depth_offset params =
   let non p x = not (p x) in
@@ -294,17 +287,23 @@ let depth_offset params =
 let rec compute_var pos uri =
   let o, _ = CicEnvironment.get_obj CicUniv.empty_ugraph uri in
   match o with
-    | Cic.Variable (_, Some body, ty, params, _) -> []
+    | Cic.Variable (_, Some _, _, _, _) -> S.empty
     | Cic.Variable (_, None, ty, params, _) ->
-	let metadata_of_vars = 
-          List.flatten 
-            (List.map (compute_var (next_pos pos)) params) in 
+	let var_metadata = 
+          List.fold_left
+            (fun metadata uri ->
+              S.union metadata (compute_var (next_pos pos) uri))
+            S.empty
+            params
+        in
 	(match pos with
 	   | `MainHypothesis (Some (Eq 0)) -> 
 	       let pos = `MainHypothesis (Some (Eq (depth_offset params))) in
-		 (compute pos ~body:None ~ty)@metadata_of_vars
+               let ty_metadata = compute_term pos ty in
+               S.union ty_metadata var_metadata
 	   | `InHypothesis ->
-	        (compute pos ~body:None ~ty)@metadata_of_vars
+               let ty_metadata = compute_term pos ty in
+               S.union ty_metadata var_metadata
 	   | _ -> assert false)
     | _ -> assert false 
 
@@ -314,22 +313,36 @@ let compute_obj uri =
   | Cic.Variable (_, body, ty, params, _)
   | Cic.Constant (_, body, ty, params, _) -> 
       let pos = `MainConclusion (Some (Eq (depth_offset params))) in
-      let metadata = compute pos ~body ~ty
-      in
-      let metadata_of_vars = 
-        List.flatten 
-          (List.map (compute_var (`MainHypothesis (Some (Eq 0)))) params) 
+      let metadata = compute pos ~body ~ty in
+      let var_metadata = 
+        List.fold_left
+          (fun metadata uri ->
+            S.union metadata (compute_var (`MainHypothesis (Some (Eq 0))) uri))
+          S.empty
+          params
       in
-      [UriManager.string_of_uri uri, 
-         UriManager.name_of_uri uri,metadata @ metadata_of_vars]
+      [ UriManager.string_of_uri uri, 
+        UriManager.name_of_uri uri,
+        S.union metadata var_metadata ]
   | Cic.InductiveDefinition (types, params, _, _) ->
       let pos = `MainConclusion(Some (Eq (depth_offset params))) in
-      let metadata_of_vars = 
-        List.flatten 
-          (List.map (compute_var (`MainHypothesis (Some (Eq 0)))) params) in
       let metadata = compute_ind pos ~uri ~types in
-	List.map (fun (uri,name,md) -> (uri,name,md@metadata_of_vars)) metadata
+      let var_metadata = 
+        List.fold_left
+          (fun metadata uri ->
+            S.union metadata (compute_var (`MainHypothesis (Some (Eq 0))) uri))
+          S.empty params
+      in
+      List.fold_left
+        (fun acc m -> 
+          (List.map (fun (uri,name,md) -> (uri,name,S.union md var_metadata)) m)
+          @ acc)
+        [] metadata
   | Cic.CurrentProof _ -> assert false    
 
+let compute_obj uri = 
+  List.map (fun (u, n, md) -> (u, n, S.elements md)) (compute_obj uri)
+  
+let compute ~body ~ty =
+  S.elements (compute (`MainConclusion (Some (Eq 0))) ~body ~ty)
 
-let compute ~body ~ty = compute (`MainConclusion (Some (Eq 0))) ~body ~ty 
-- 
2.39.2