X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;ds=inline;f=helm%2Focaml%2Fcic_unification%2FcicUnification.mli;h=5887f004d858d8d6e7c11a49d8dd733c262ab131;hb=b16f00b453ffb484e9e6b02b00917ab7920b1a38;hp=464927a2d05ff6738da9132c83698febb26d31a4;hpb=0328c0e2938ce714d5d7358afdca00195577198e;p=helm.git

diff --git a/helm/ocaml/cic_unification/cicUnification.mli b/helm/ocaml/cic_unification/cicUnification.mli
index 464927a2d..5887f004d 100644
--- a/helm/ocaml/cic_unification/cicUnification.mli
+++ b/helm/ocaml/cic_unification/cicUnification.mli
@@ -23,37 +23,41 @@
  * http://cs.unibo.it/helm/.
  *)
 
-exception UnificationFailed
-exception Free
-exception OccurCheck
+type failure_msg
 
-val delift : 
- Cic.context -> Cic.metasenv -> (Cic.term option) list -> Cic.term -> Cic.term * Cic.metasenv
+exception UnificationFailure of failure_msg;;
+exception Uncertain of string;;
+exception AssertFailure of failure_msg;;
 
-(* The entry (i,t) in a substitution means that *)
-(* (META i) have been instantiated with t.      *)
-type substitution = (int * Cic.term) list
+val failure_msg_of_string: string -> failure_msg
+val explain_error: failure_msg -> string
 
 (* fo_unif metasenv context t1 t2                *)
 (* unifies [t1] and [t2] in a context [context]. *)
 (* Only the metavariables declared in [metasenv] *)
 (* can be used in [t1] and [t2].                 *)
+(* The returned substitution can be directly     *)
+(* withouth first unwinding it.                  *)
 val fo_unif :
-  Cic.metasenv -> Cic.context -> Cic.term -> Cic.term ->
-   substitution * Cic.metasenv
+  Cic.metasenv -> Cic.context -> 
+    Cic.term -> Cic.term -> CicUniv.universe_graph -> 
+      Cic.substitution * Cic.metasenv * CicUniv.universe_graph
 
-(* apply_subst subst t                    *)
-(* applies the substitution [sust] to [t] *)
-val apply_subst : substitution -> Cic.term -> Cic.term
+(* fo_unif_subst metasenv subst context t1 t2    *)
+(* unifies [t1] and [t2] in a context [context]  *)
+(* and with [subst] as the current substitution  *)
+(* (i.e. unifies ([subst] [t1]) and              *)
+(* ([subst] [t2]) in a context                   *)
+(* ([subst] [context]) using the metasenv        *)
+(* ([subst] [metasenv])                          *)
+(* Only the metavariables declared in [metasenv] *)
+(* can be used in [t1] and [t2].                 *)
+(* [subst] and the substitution returned are not *)
+(* unwinded.                                     *)
+(*CSC: fare un tipo unione Unwinded o ToUnwind e fare gestire la
+ cosa all'apply_subst!!!*)
+val fo_unif_subst :
+  Cic.substitution -> Cic.context -> Cic.metasenv -> 
+    Cic.term -> Cic.term -> CicUniv.universe_graph ->
+      Cic.substitution * Cic.metasenv * CicUniv.universe_graph
 
-(* apply_subst_reducing subst (Some (mtr,reductions_no)) t              *)
-(* performs as (apply_subst subst t) until it finds an application of   *)
-(* (META [mtr]) that, once unwinding is performed, creates a new        *)
-(* beta-redex; in this case up to [reductions_no] consecutive           *)
-(* beta-reductions are performed.                                       *)
-(* Hint: this function is usually called when [reductions_no]           *)
-(*  eta-expansions have been performed and the head of the new          *)
-(*  application has been unified with (META [meta_to_reduce]):          *)
-(*  during the unwinding the eta-expansions are undone.                 *)
-val apply_subst_reducing :
- substitution -> (int * int) option -> Cic.term -> Cic.term