From: denes <??>
Date: Wed, 29 Jul 2009 16:28:29 +0000 (+0000)
Subject: Added Clauses module
X-Git-Url: http://matita.cs.unibo.it/gitweb/?p=helm.git;a=commitdiff_plain;h=156e5aad803c661dc2967b8f33642e89e8e878a1

Added Clauses module
---

diff --git a/helm/software/components/ng_paramodulation/clauses.ml b/helm/software/components/ng_paramodulation/clauses.ml
new file mode 100644
index 000000000..895d3865e
--- /dev/null
+++ b/helm/software/components/ng_paramodulation/clauses.ml
@@ -0,0 +1,84 @@
+(*
+    ||M||  This file is part of HELM, an Hypertextual, Electronic        
+    ||A||  Library of Mathematics, developed at the Computer Science     
+    ||T||  Department, University of Bologna, Italy.                     
+    ||I||                                                                
+    ||T||  HELM is free software; you can redistribute it and/or         
+    ||A||  modify it under the terms of the GNU General Public License   
+    \   /  version 2 or (at your option) any later version.      
+     \ /   This software is distributed as is, NO WARRANTY.     
+      V_______________________________________________________________ *)
+
+(* $Id: terms.ml 9836 2009-06-05 15:33:35Z denes $ *)
+
+module type Blob =
+  sig
+    include Orderings.Blob
+
+  end
+
+module Clauses (B : Orderings.Blob) = struct
+  module Order = B;;
+  module Utils = FoUtils.Utils(B)
+
+  let eq_clause (id1,_,_,_,_) (id2,_,_,_,_) = id1 = id2
+  let compare_clause (id1,_,_,_,_) (id2,_,_,_,_) = Pervasives.compare id1 id2
+    
+  let fresh_clause maxvar (id, nlit, plit, varlist, proof) =
+    let maxvar, varlist, subst = Utils.relocate maxvar varlist FoSubst.id_subst in
+    let apply_subst_on_lit = function
+      | Terms.Equation (l,r,ty,o) ->
+          let l = FoSubst.apply_subst subst l in
+          let r = FoSubst.apply_subst subst r in
+          let ty = FoSubst.apply_subst subst ty in
+          Terms.Equation (l,r,ty,o)
+      | Terms.Predicate p ->
+          let p = FoSubst.apply_subst subst p in
+          Terms.Predicate p
+    in
+    let nlit = List.map (fun (l,s) -> (apply_subst_on_lit l,s)) nlit in
+    let plit = List.map (fun (l,s) -> (apply_subst_on_lit l,s)) plit in
+    let proof =
+      match proof with
+      | Terms.Exact t -> Terms.Exact (FoSubst.apply_subst subst t)
+      | Terms.Step (rule,c1,c2,dir,pos,s) ->
+          Terms.Step(rule,c1,c2,dir,pos,FoSubst.concat subst s)
+    in
+     (id, nlit, plit, varlist, proof), maxvar
+  ;;
+
+  (* may be moved inside the bag *)
+  let mk_clause maxvar nlit plit proofterm =
+    let foterm_to_lit (acc,literals) ty =
+      let vars = Terms.vars_of_term ~start_acc:acc ty in
+      match ty with
+      | Terms.Node [ Terms.Leaf eq ; ty; l; r ] when B.eq B.eqP eq ->
+           let o = Order.compare_terms l r in
+           (vars,(Terms.Equation (l, r, ty, o),true)::literals)
+      | _ -> (vars,(Terms.Predicate ty,true)::literals)
+    in
+    let varlist = Terms.vars_of_term proofterm in
+    let (varlist,nlit) = List.fold_left foterm_to_lit (varlist,[]) nlit in
+    let (varlist,plit) = List.fold_left foterm_to_lit (varlist,[]) plit in
+    let proof = Terms.Exact proofterm in
+    fresh_clause maxvar (0, nlit, plit, varlist, proof)
+  ;;
+
+  let mk_passive_clause cl =
+    (Order.compute_clause_weight cl, cl)
+  ;;
+
+  let mk_passive_goal g =
+    (Order.compute_clause_weight g, g)
+  ;;
+
+  let compare_passive_clauses_weight (w1,(id1,_,_,_,_)) (w2,(id2,_,_,_,_)) =
+    if w1 = w2 then id1 - id2
+    else w1 - w2
+  ;;
+
+  let compare_passive_clauses_age (_,(id1,_,_,_,_)) (_,(id2,_,_,_,_)) =
+    id1 - id2
+  ;;
+
+end
diff --git a/helm/software/components/ng_paramodulation/clauses.mli b/helm/software/components/ng_paramodulation/clauses.mli
new file mode 100644
index 000000000..885e97607
--- /dev/null
+++ b/helm/software/components/ng_paramodulation/clauses.mli
@@ -0,0 +1,40 @@
+(*
+    ||M||  This file is part of HELM, an Hypertextual, Electronic        
+    ||A||  Library of Mathematics, developed at the Computer Science     
+    ||T||  Department, University of Bologna, Italy.                     
+    ||I||                                                                
+    ||T||  HELM is free software; you can redistribute it and/or         
+    ||A||  modify it under the terms of the GNU General Public License   
+    \   /  version 2 or (at your option) any later version.      
+     \ /   This software is distributed as is, NO WARRANTY.     
+      V_______________________________________________________________ *)
+
+(* $Id: terms.ml 9836 2009-06-05 15:33:35Z denes $ *)
+
+module type Blob =
+  sig
+    include Orderings.Blob
+
+  end
+
+module Clauses (B : Orderings.Blob) :
+  sig
+
+    val eq_clause : B.t Terms.clause -> B.t Terms.clause -> bool
+    val compare_clause : B.t Terms.clause -> B.t Terms.clause -> int      
+    val fresh_clause : int -> B.t Terms.clause -> B.t Terms.clause * int
+
+    val mk_clause : int -> B.t Terms.foterm list -> B.t Terms.foterm list
+                           -> B.t Terms.foterm -> B.t Terms.clause * int
+
+    val mk_passive_clause : B.t Terms.clause -> int * B.t Terms.clause
+ 
+    val mk_passive_goal : B.t Terms.clause -> int * B.t Terms.clause
+ 
+    val compare_passive_clauses_weight :
+           int * B.t Terms.clause -> int * B.t Terms.clause -> int
+ 
+    val compare_passive_clauses_age :
+           int * B.t Terms.clause -> int * B.t Terms.clause -> int
+
+end