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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 Names

(** Introduction patterns *)

type 'constr intro_pattern_expr =
  | IntroForthcoming of bool
  | IntroNaming of intro_pattern_naming_expr
  | IntroAction of 'constr intro_pattern_action_expr
and intro_pattern_naming_expr =
  | IntroIdentifier of Id.t
  | IntroFresh of Id.t
  | IntroAnonymous
and 'constr intro_pattern_action_expr =
  | IntroWildcard
  | IntroOrAndPattern of 'constr or_and_intro_pattern_expr
  | IntroInjection of ('constr intro_pattern_expr) CAst.t list
  | IntroApplyOn of 'constr CAst.t * 'constr intro_pattern_expr CAst.t
  | IntroRewrite of bool
and 'constr or_and_intro_pattern_expr =
  | IntroOrPattern of ('constr intro_pattern_expr) CAst.t list list
  | IntroAndPattern of ('constr intro_pattern_expr) CAst.t list

(** Move destination for hypothesis *)

type 'id move_location =
  | MoveAfter of 'id
  | MoveBefore of 'id
  | MoveFirst
  | MoveLast (** can be seen as "no move" when doing intro *)

(** Casts *)

type 'a cast_type =
  | CastConv of 'a
  | CastVM of 'a
  | CastCoerce (** Cast to a base type (eg, an underlying inductive type) *)
  | CastNative of 'a

(** Bindings *)

type quantified_hypothesis = AnonHyp of int | NamedHyp of Id.t

type 'a explicit_bindings = (quantified_hypothesis * 'a) CAst.t list

type 'a bindings =
  | ImplicitBindings of 'a list
  | ExplicitBindings of 'a explicit_bindings
  | NoBindings

type 'a with_bindings = 'a * 'a bindings

(** Some utility types for parsing *)

type 'a or_var =
  | ArgArg of 'a
  | ArgVar of lident

type 'a and_short_name = 'a * lident option

type 'a or_by_notation_r =
  | AN of 'a
  | ByNotation of (string * string option)

type 'a or_by_notation = 'a or_by_notation_r CAst.t

(* NB: the last string in [ByNotation] is actually a [Notation.delimiters],
   but this formulation avoids a useless dependency. *)

(** Various flags *)

type direction_flag = bool (* true = Left-to-right    false = right-to-right *)
type evars_flag = bool     (* true = pose evars       false = fail on evars *)
type rec_flag = bool       (* true = recursive        false = not recursive *)
type advanced_flag = bool  (* true = advanced         false = basic *)
type letin_flag = bool     (* true = use local def    false = use Leibniz *)
type clear_flag = bool option (* true = clear hyp, false = keep hyp, None = use default *)