X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=helm%2Fsoftware%2Fcomponents%2Fng_paramodulation%2FnCicBlob.ml;h=c1c7a9071fdee01ed9ad69959782f7e73886ad25;hb=33a4938d5ce3a5c240c0d35b6362c8072f8ba482;hp=bc7289176776131a7837e35c0a86dd811d9b93ca;hpb=94bd7b4d027e4152bd08cb984a66fae7077d9da6;p=helm.git

diff --git a/helm/software/components/ng_paramodulation/nCicBlob.ml b/helm/software/components/ng_paramodulation/nCicBlob.ml
index bc7289176..c1c7a9071 100644
--- a/helm/software/components/ng_paramodulation/nCicBlob.ml
+++ b/helm/software/components/ng_paramodulation/nCicBlob.ml
@@ -20,6 +20,17 @@ let default_eqP() =
     NCic.Const ref
 ;;
 
+let equivalence_relation =
+  let uri = NUri.uri_of_string "cic:/matita/ng/properties/relations/eq_rel.con"
+  in
+  let ref = NReference.reference_of_spec uri (NReference.Fix(0,1,2)) 
+  in NCic.Const ref
+
+let setoid_eq =
+  let uri = NUri.uri_of_string "cic:/matita/ng/sets/setoids/eq.con" in
+  let ref = NReference.reference_of_spec uri (NReference.Fix(0,0,2)) 
+  in NCic.Const ref
+
 let set_default_eqP() = eqPref := default_eqP
 
 let set_reference_of_oxuri f = 
@@ -49,11 +60,24 @@ with type t = NCic.term and type input = NCic.term = struct
   let eq x y = x = y;;
     (* NCicReduction.alpha_eq C.metasenv C.subst C.context x y;; *)
 
+  let height_of_ref = function
+    | NReference.Def h -> h
+    | NReference.Fix(_,_,h) -> h
+    | _ -> 0
+
+  let compare_refs (NReference.Ref (u1,r1)) (NReference.Ref (u2,r2)) =
+    let x = height_of_ref r2 - height_of_ref r1 in
+      if x = 0 then 
+	Hashtbl.hash (NUri.string_of_uri u1,r1) - 
+	  Hashtbl.hash (NUri.string_of_uri u2,r2)
+      else x 
+
   let rec compare x y = 
     match x,y with
     | NCic.Rel i, NCic.Rel j -> j-i
     | NCic.Meta (i,_), NCic.Meta (j,_) -> i-j
-    | NCic.Const r1, NCic.Const r2 -> NReference.compare r1 r2
+    | NCic.Const r1, NCic.Const r2 -> compare_refs r1 r2
+    (*NReference.compare r1 r2*)
     | NCic.Appl l1, NCic.Appl l2 -> FoUtils.lexicograph compare l1 l2
     | NCic.Rel _, ( NCic.Meta _ | NCic.Const _ | NCic.Appl _ ) -> ~-1
     | ( NCic.Meta _ | NCic.Const _ | NCic.Appl _ ), NCic.Rel _ -> 1
@@ -72,6 +96,18 @@ with type t = NCic.term and type input = NCic.term = struct
     else compare x y
   ;;
 
+  let eqP = (!eqPref)()
+  ;;
+
+  let is_eq = function
+    | Terms.Node [ Terms.Leaf eqt ; ty; l; r ] when eq eqP eqt ->
+        Some (ty,l,r) 
+(*
+    | Terms.Node [ Terms.Leaf eqt ; _; Terms.Node [Terms.Leaf eqt2 ; ty]; l; r]
+	when eq equivalence_relation eqt && eq setoid_eq eqt2 ->
+        Some (ty,l,r) *)
+    | _ -> None
+
   let pp t = 
     NCicPp.ppterm ~context:C.context ~metasenv:C.metasenv ~subst:C.subst t;;
 
@@ -105,7 +141,4 @@ with type t = NCic.term and type input = NCic.term = struct
     proof, sty
   ;;
   
-  let eqP = (!eqPref)()
-  ;;
-
  end