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(** {1 New Proof sessions ("Refectoire")} *)


(** {2 upper level structure of sessions}

   A [session] contains a collection of files, a [file] contains a
collection of theories, a [theory] contains a collection of goals. The
structure of goals remain abstract, each goal being identified by
unique identifiers of type [proofNodeId]

*)

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type session
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type file
type theory
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type proofNodeID
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val print_proofNodeID : Format.formatter -> proofNodeID -> unit
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type transID
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type proofAttemptID
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module Hpn: Exthtbl.S with type key = proofNodeID
module Htn: Exthtbl.S with type key = transID
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module Hpan: Exthtbl.S with type key = proofAttemptID
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(* Any proof node of the tree *)
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type any =
  | AFile of file
  | ATh of theory
  | ATn of transID
  | APn of proofNodeID
  | APa of proofAttemptID

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type notifier = any -> unit


(** Session *)
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(* Get all the files in the session *)
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val get_files : session -> file Stdlib.Hstr.t
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(* Get a single file in the session using its name *)
val get_file: session -> string -> file
(* Get directory containing the session *)
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val get_dir : session -> string
val get_shape_version : session -> int
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(** File *)
val file_name : file -> string
val file_format : file -> string option
val file_theories : file -> theory list
val file_detached_theories : file -> theory list

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(** Theory *)
val theory_name : theory -> Ident.ident
val theory_goals : theory -> proofNodeID list
val theory_detached_goals : theory -> proofNodeID list
val theory_parent : session -> theory -> file

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type proof_attempt_node = private {
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  parent              : proofNodeID;
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  prover              : Whyconf.prover;
  limit               : Call_provers.resource_limit;
  mutable proof_state : Call_provers.prover_result option;
  (* None means that the call was not done or never returned *)
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  mutable proof_obsolete      : bool;
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  proof_script        : string option;  (* non empty for external ITP *)
}
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val theory_iter_proof_attempt:
    session -> (proof_attempt_node -> unit) -> theory -> unit

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val session_iter_proof_attempt:
    (proofAttemptID -> proof_attempt_node -> unit) -> session -> unit
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(* [is_below s a b] true if a is below b in the session tree *)
val is_below: session -> any -> any -> bool

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type proof_parent = Trans of transID | Theory of theory
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val get_task : session -> proofNodeID -> Task.task
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val get_table : session -> proofNodeID -> Task.names_table option
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val get_transformations : session -> proofNodeID -> transID list
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val get_proof_attempt_ids :
  session -> proofNodeID -> proofAttemptID Whyconf.Hprover.t
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val get_proof_attempt_node : session -> proofAttemptID -> proof_attempt_node
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val get_proof_attempt_parent : session -> proofAttemptID -> proofNodeID
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val get_proof_attempts : session -> proofNodeID -> proof_attempt_node list
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val get_sub_tasks : session -> transID -> proofNodeID list
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val get_detached_sub_tasks : session -> transID -> proofNodeID list
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val get_transf_args : session -> transID -> string list
val get_transf_name : session -> transID -> string

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val get_proof_name : session -> proofNodeID -> Ident.ident
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val get_proof_expl : session -> proofNodeID -> string
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val get_proof_parent : session -> proofNodeID -> proof_parent
val get_trans_parent : session -> transID -> proofNodeID

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val get_detached_trans : session -> proofNodeID -> transID list
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val get_any_parent: session -> any -> any option

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(* Answers true if a node is in a detached subtree *)
val is_detached: session -> any -> bool

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(* get the parent theory/file of a proof node *)
val get_encapsulating_theory: session -> any -> theory
val get_encapsulating_file: session -> any -> file


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exception BadCopyDetached of string
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(** [copy s pn] copy pn and add the copy as detached subgoal of its parent *)
val copy_proof_node_as_detached: session -> proofNodeID -> proofNodeID
val copy_structure: notification:(parent:any -> any -> unit) -> session -> any -> any -> unit

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val empty_session : ?shape_version:int -> string -> session
(** create an empty_session in the directory specified by the
    argument *)
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val add_file_section :
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  session -> string -> (Theory.theory list) ->
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  Env.fformat option -> unit
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(** [add_file_section s fn ths] adds a new
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    'file' section in session [s], named [fn], containing fresh theory
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    subsections corresponding to theories [ths]. The tasks of each
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    theory nodes generated are computed using [Task.split_theory]. *)

val merge_file_section :
  use_shapes:bool -> old_ses:session -> old_theories:theory list ->
  env:Env.env -> session -> string -> Theory.theory list ->
  Env.fformat option -> unit
(** [merge_file_section ~old_s ~old_theories ~env ~pn_callpack s fn
    ths] adds a new 'file' section in session [s], named [fn],
    containing fresh theory subsections corresponding to theories
    [ths]. For each theory whose name is identical to one theory of
    old_ths, it is attempted to associate the old goals,
    proof_attempts and transformations to the goals of the new
    theory *)
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val graft_proof_attempt : ?file:string -> session -> proofNodeID ->
  Whyconf.prover -> limit:Call_provers.resource_limit -> proofAttemptID
(** [graft_proof_attempt s id pr file l] adds a proof attempt with prover
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    [pr] and limits [l] in the session [s] as a child of the task
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    [id]. If there already a proof attempt with the same prover, it
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    updates it with the limits. It returns the id of the
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    generated proof attempt.
    For manual proofs, it has the same behaviour except that it adds a
    proof_script field equal to [file].
*)
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val update_proof_attempt : ?obsolete:bool -> session -> proofNodeID ->
  Whyconf.prover -> Call_provers.prover_result -> unit
(** [update_proof_attempt ?obsolete s id pr st] update the status of the
    corresponding proof attempt with [st].
    If [obsolete] is set to true, it marks the proof_attempt obsolete
    direclty (useful for interactive prover).
*)
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val graft_transf : session -> proofNodeID -> string -> string list ->
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  Task.task list -> transID
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(** [graft_transf s id name l tl] adds the transformation [name] as a
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    child of the task [id] of the session [s]. [l] is the list of
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    arguments of the transformation, and [tl] is the list of subtasks.
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*)
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val remove_proof_attempt : session -> proofNodeID -> Whyconf.prover -> unit
(** [remove_proof_attempt s id pr] removes the proof attempt from the
    prover [pr] from the proof node [id] of the session [s] *)
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val remove_transformation : session -> transID -> unit
(** [remove_transformation s id] removes the transformation [id]
    from the session [s] *)
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val mark_obsolete: session -> proofAttemptID -> unit
(** [mark_obsolete s id] marks [id] as obsolete in [s] *)

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val save_session : session -> unit
(** [save_session s] Save the session [s] *)
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val load_session : string -> session * bool
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(** [load_session dir] load a session in directory [dir]; all the
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    tasks are initialised to None

    The returned boolean is set when there was shapes read from disk.

    raises [SessionFileError msg] if the database file cannot be read
    correctly.

    raises [ShapesFileError msg] if the database extra file for shapes
    cannot be read.
 *)
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exception RemoveError

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val remove_subtree: notification:notifier -> removed:notifier ->
                    session -> any -> unit
(** [remove_subtree s a ~removed ~notification] remove the subtree
    originating from node [a] in session [s]. the notifier [removed] is
    called on each removed node, and notifier [notification] on nodes
    whose proved state changes.
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    raises [RemoveError] when removal is forbidden, e.g. when called on
    a theory, or a goal that is not detached
 *)
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val fold_all_any: session -> ('a -> any -> 'a) -> 'a -> any -> 'a
(** [fold_all_any s f acc any] folds on all the subnodes of any *)
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val fold_all_session: session -> ('a -> any -> 'a) -> 'a -> 'a
(** [fold_all_session s f acc] folds on the whole session *)
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(* proved status *)

val th_proved : session -> theory -> bool
val pn_proved : session -> proofNodeID -> bool
val tn_proved : session -> transID -> bool
val file_proved : session -> file -> bool
val any_proved : session -> any -> bool

(* status update *)

val update_goal_node : notifier -> session -> proofNodeID -> unit
(** [updates the proved status of the given goal node. If necessary, propagates
    the update to ancestors. [notifier] is called on all nodes whose status changes *)

val update_trans_node : notifier -> session -> transID -> unit
(** [updates the proved status of the given transformation node. If necessary, propagates
    the update to ancestors. [notifier] is called on all nodes whose status changes *)