From 3ef7797ef6fc605dfafb32523261fe1b023aeecb Mon Sep 17 00:00:00 2001
From: Samuel Mimram <smimram@debian.org>
Date: Fri, 28 Apr 2006 14:59:16 +0000
Subject: Imported Upstream version 8.0pl3+8.1alpha

---
 proofs/clenvtac.ml | 97 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 97 insertions(+)
 create mode 100644 proofs/clenvtac.ml

(limited to 'proofs/clenvtac.ml')

diff --git a/proofs/clenvtac.ml b/proofs/clenvtac.ml
new file mode 100644
index 00000000..71538614
--- /dev/null
+++ b/proofs/clenvtac.ml
@@ -0,0 +1,97 @@
+(************************************************************************)
+(*  v      *   The Coq Proof Assistant  /  The Coq Development Team     *)
+(* <O___,, * CNRS-Ecole Polytechnique-INRIA Futurs-Universite Paris Sud *)
+(*   \VV/  **************************************************************)
+(*    //   *      This file is distributed under the terms of the       *)
+(*         *       GNU Lesser General Public License Version 2.1        *)
+(************************************************************************)
+
+(* $Id: clenvtac.ml 8023 2006-02-10 18:34:51Z coq $ *)
+
+open Pp
+open Util
+open Names
+open Nameops
+open Term
+open Termops
+open Sign
+open Environ
+open Evd
+open Evarutil
+open Proof_type
+open Refiner
+open Proof_trees
+open Logic
+open Reduction
+open Reductionops
+open Tacmach
+open Evar_refiner
+open Rawterm
+open Pattern
+open Tacexpr
+open Clenv
+
+    
+(* This function put casts around metavariables whose type could not be
+ * infered by the refiner, that is head of applications, predicates and
+ * subject of Cases.
+ * Does check that the casted type is closed. Anyway, the refiner would
+ * fail in this case... *)
+
+let clenv_cast_meta clenv = 
+  let rec crec u =
+    match kind_of_term u with
+      | App _ | Case _ -> crec_hd u
+      | Cast (c,_,_) when isMeta c -> u
+      | _  -> map_constr crec u
+	    
+  and crec_hd u =
+    match kind_of_term (strip_outer_cast u) with
+      | Meta mv ->
+	  (try 
+            let b = Typing.meta_type clenv.env mv in
+	    if occur_meta b then u
+            else mkCast (mkMeta mv, DEFAULTcast, b)
+	  with Not_found -> u)
+      | App(f,args) -> mkApp (crec_hd f, Array.map crec args)
+      | Case(ci,p,c,br) ->
+	  mkCase (ci, crec_hd p, crec_hd c, Array.map crec br)
+      | _ -> u
+  in 
+  crec
+
+let clenv_refine clenv gls =
+  tclTHEN
+    (tclEVARS (evars_of clenv.env)) 
+    (refine (clenv_cast_meta clenv (clenv_value clenv)))
+    gls
+
+
+let res_pf clenv ?(allow_K=false) gls =
+  clenv_refine (clenv_unique_resolver allow_K clenv gls) gls
+
+let elim_res_pf_THEN_i clenv tac gls =  
+  let clenv' = (clenv_unique_resolver true clenv gls) in
+  tclTHENLASTn (clenv_refine clenv') (tac clenv') gls
+
+
+let e_res_pf clenv gls =
+  clenv_refine (evar_clenv_unique_resolver clenv gls) gls
+
+
+
+
+(* [unifyTerms] et [unify] ne semble pas gérer les Meta, en
+   particulier ne semblent pas vérifier que des instances différentes
+   d'une même Meta sont compatibles. D'ailleurs le "fst" jette les metas
+   provenant de w_Unify. (Utilisé seulement dans prolog.ml) *)
+
+(* let unifyTerms m n = walking (fun wc -> fst (w_Unify CONV m n [] wc)) *)
+let unifyTerms m n gls = 
+  let env = pf_env gls in
+  let evd = create_evar_defs (project gls) in
+  let evd' = Unification.w_unify false env CONV m n evd in
+  tclIDTAC {it = gls.it; sigma = evars_of evd'}
+
+let unify m gls =
+  let n = pf_concl gls in unifyTerms m n gls
-- 
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