(* $Id$ *)

(*i*)
open Names
open Term
open Declarations
open Abstraction
open Univ
open Sign
(*i*)

(* Unsafe environments. We define here a datatype for environments. 
   Since typing is not yet defined, it is not possible to check the
   informations added in environments, and that is what we speak here
   of ``unsafe'' environments. *)

type env

val empty_env : env

val universes : env -> universes
val context : env -> context
val var_context : env -> var_context

val push_var : identifier * typed_type -> env -> env
val change_hyps : 
  (typed_type signature -> typed_type signature) -> env -> env
val change_name_rel : env -> int -> identifier -> env

val push_rel : name * typed_type -> env -> env

val set_universes : universes -> env -> env
val add_constraints : constraints -> env -> env
val add_constant : 
  section_path -> constant_body -> env -> env
val add_mind : 
  section_path -> mutual_inductive_body -> env -> env
val add_abstraction : 
  section_path -> abstraction_body -> env -> env

val new_meta : unit -> int

val lookup_var : identifier -> env -> name * typed_type
val lookup_rel : int -> env -> name * typed_type
val lookup_constant : section_path -> env -> constant_body
val lookup_mind : section_path -> env -> mutual_inductive_body

val id_of_global : env -> sorts oper -> identifier

val id_of_name_using_hdchar : env -> constr -> name -> identifier

(* [named_hd env t na] just returns [na] is it defined, otherwise it
   creates a name built from [t] (e.g. ["n"] if [t] is [nat]) *)

val named_hd : env -> constr -> name -> name

(* [lambda_name env (na,t,c)] builds [[[x:t]c] where [x] is created
   using [named_hd] if [na] is [Anonymous]; [prod_name env (na,t,c)]
   works similarly but build a product; for [it_lambda_name env c
   sign] and [it_prod_name env c sign], more recent types should come
   first in [sign]; none of these functions substitute named
   variables in [c] by de Bruijn indices *)

val lambda_name : env -> name * constr * constr -> constr
val prod_name : env -> name * constr * constr -> constr

val it_lambda_name : env -> constr -> (name * constr) list -> constr
val it_prod_name : env -> constr -> (name * constr) list -> constr

(* [lambda_create env (t,c)] builds [[x:t]c] where [x] is a name built
   from [t]; [prod_create env (t,c)] builds [(x:t)c] where [x] is a
   name built from [t] *)

val lambda_create : env -> constr * constr -> constr
val prod_create : env -> constr * constr -> constr


val translucent_abst : env -> constr -> bool
val evaluable_abst : env -> constr -> bool
val abst_value : env -> constr -> constr

val defined_constant : env -> constr -> bool
val evaluable_constant : env -> constr -> bool

(*s Modules. *)

type compiled_env

val export : env -> string -> compiled_env
val import : compiled_env -> env -> env

(*s Unsafe judgments. We introduce here the pre-type of judgments, which is
  actually only a datatype to store a term with its type and the type of its
  type. *)

type unsafe_judgment = { 
  uj_val : constr;
  uj_type : constr;
  uj_kind : constr }

val cast_of_judgment : unsafe_judgment -> constr