1 files changed, 52 insertions, 0 deletions
diff --git a/pretyping/univdecls.ml b/pretyping/univdecls.ml
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+(************************************************************************)
+(*         *   The Coq Proof Assistant / The Coq Development Team       *)
+(*  v      *   INRIA, CNRS and contributors - Copyright 1999-2018       *)
+(* <O___,, *       (see CREDITS file for the list of authors)           *)
+(*   \VV/  **************************************************************)
+(*    //   *    This file is distributed under the terms of the         *)
+(*         *     GNU Lesser General Public License Version 2.1          *)
+(*         *     (see LICENSE file for the text of the license)         *)
+(************************************************************************)
+
+open CErrors
+
+(** Local universes and constraints declarations *)
+type universe_decl =
+  (Misctypes.lident list, Univ.Constraint.t) Misctypes.gen_universe_decl
+
+let default_univ_decl =
+  let open Misctypes in
+  { univdecl_instance = [];
+    univdecl_extensible_instance = true;
+    univdecl_constraints = Univ.Constraint.empty;
+    univdecl_extensible_constraints = true }
+
+let interp_univ_constraints env evd cstrs =
+  let interp (evd,cstrs) (u, d, u') =
+    let ul = Pretyping.interp_known_glob_level evd u in
+    let u'l = Pretyping.interp_known_glob_level evd u' in
+    let cstr = (ul,d,u'l) in
+    let cstrs' = Univ.Constraint.add cstr cstrs in
+    try let evd = Evd.add_constraints evd (Univ.Constraint.singleton cstr) in
+        evd, cstrs'
+    with Univ.UniverseInconsistency e ->
+      user_err ~hdr:"interp_constraint"
+        (Univ.explain_universe_inconsistency (Termops.pr_evd_level evd) e)
+  in
+  List.fold_left interp (evd,Univ.Constraint.empty) cstrs
+
+let interp_univ_decl env decl =
+  let open Misctypes in
+  let pl : lident list = decl.univdecl_instance in
+  let evd = Evd.from_ctx (UState.make_with_initial_binders (Environ.universes env) pl) in
+  let evd, cstrs = interp_univ_constraints env evd decl.univdecl_constraints in
+  let decl = { univdecl_instance = pl;
+    univdecl_extensible_instance = decl.univdecl_extensible_instance;
+    univdecl_constraints = cstrs;
+    univdecl_extensible_constraints = decl.univdecl_extensible_constraints }
+  in evd, decl
+
+let interp_univ_decl_opt env l =
+  match l with
+  | None -> Evd.from_env env, default_univ_decl
+  | Some decl -> interp_univ_decl env decl