src/HOL/Tools/Sledgehammer/sledgehammer_atp_reconstruct.ML
author blanchet
Sun May 01 18:37:24 2011 +0200 (2011-05-01)
changeset 42554 f83036b85a3a
parent 42551 cd99d6d3027a
child 42562 f1d903f789b1
permissions -rw-r--r--
added friendly hint when Isar proof is missing
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(*  Title:      HOL/Tools/Sledgehammer/sledgehammer_atp_reconstruct.ML
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    Author:     Lawrence C. Paulson, Cambridge University Computer Laboratory
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    Author:     Claire Quigley, Cambridge University Computer Laboratory
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    Author:     Jasmin Blanchette, TU Muenchen
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Proof reconstruction for Sledgehammer.
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*)
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signature SLEDGEHAMMER_ATP_RECONSTRUCT =
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sig
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  type 'a proof = 'a ATP_Proof.proof
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  type locality = Sledgehammer_Filter.locality
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  type type_system = Sledgehammer_ATP_Translate.type_system
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  type minimize_command = string list -> string
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  type metis_params =
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    string * type_system * minimize_command * string proof * int
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    * (string * locality) list vector * thm * int
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  type isar_params =
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    string Symtab.table * bool * int * Proof.context * int list list
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  type text_result = string * (string * locality) list
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  val repair_conjecture_shape_and_fact_names :
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    string -> int list list -> (string * locality) list vector
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    -> int list list * (string * locality) list vector
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  val used_facts_in_atp_proof :
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    int -> (string * locality) list vector -> string proof
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    -> (string * locality) list
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  val is_unsound_proof :
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    int list list -> int -> (string * locality) list vector -> string proof
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    -> bool
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  val apply_on_subgoal : string -> int -> int -> string
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  val command_call : string -> string list -> string
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  val try_command_line : string -> string -> string
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  val minimize_line : ('a list -> string) -> 'a list -> string
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  val split_used_facts :
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    (string * locality) list
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    -> (string * locality) list * (string * locality) list
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  val metis_proof_text : metis_params -> text_result
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  val isar_proof_text : isar_params -> metis_params -> text_result
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  val proof_text : bool -> isar_params -> metis_params -> text_result
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end;
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structure Sledgehammer_ATP_Reconstruct : SLEDGEHAMMER_ATP_RECONSTRUCT =
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struct
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open ATP_Problem
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open ATP_Proof
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open Metis_Translate
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open Sledgehammer_Util
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open Sledgehammer_Filter
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open Sledgehammer_ATP_Translate
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type minimize_command = string list -> string
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type metis_params =
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  string * type_system * minimize_command * string proof * int
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  * (string * locality) list vector * thm * int
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type isar_params =
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  string Symtab.table * bool * int * Proof.context * int list list
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type text_result = string * (string * locality) list
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fun is_head_digit s = Char.isDigit (String.sub (s, 0))
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val scan_integer = Scan.many1 is_head_digit >> (the o Int.fromString o implode)
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fun find_first_in_list_vector vec key =
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  Vector.foldl (fn (ps, NONE) => AList.lookup (op =) ps key
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                 | (_, value) => value) NONE vec
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(** SPASS's Flotter hack **)
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(* This is a hack required for keeping track of facts after they have been
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   clausified by SPASS's Flotter tool. The "ATP/scripts/spass" script is also
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   part of this hack. *)
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val set_ClauseFormulaRelationN = "set_ClauseFormulaRelation"
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fun extract_clause_sequence output =
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  let
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    val tokens_of = String.tokens (not o Char.isAlphaNum)
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    fun extract_num ("clause" :: (ss as _ :: _)) =
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    Int.fromString (List.last ss)
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      | extract_num _ = NONE
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  in output |> split_lines |> map_filter (extract_num o tokens_of) end
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val parse_clause_formula_pair =
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  $$ "(" |-- scan_integer --| $$ ","
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  -- (Symbol.scan_id ::: Scan.repeat ($$ "," |-- Symbol.scan_id)) --| $$ ")"
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  --| Scan.option ($$ ",")
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val parse_clause_formula_relation =
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  Scan.this_string set_ClauseFormulaRelationN |-- $$ "("
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  |-- Scan.repeat parse_clause_formula_pair
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val extract_clause_formula_relation =
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  Substring.full #> Substring.position set_ClauseFormulaRelationN
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  #> snd #> Substring.position "." #> fst #> Substring.string
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  #> raw_explode #> filter_out Symbol.is_blank #> parse_clause_formula_relation
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  #> fst
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val unprefix_fact_number = space_implode "_" o tl o space_explode "_"
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fun repair_conjecture_shape_and_fact_names output conjecture_shape fact_names =
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  if String.isSubstring set_ClauseFormulaRelationN output then
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    let
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      val j0 = hd (hd conjecture_shape)
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      val seq = extract_clause_sequence output
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      val name_map = extract_clause_formula_relation output
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      fun renumber_conjecture j =
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        conjecture_prefix ^ string_of_int (j - j0)
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        |> AList.find (fn (s, ss) => member (op =) ss s) name_map
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        |> map (fn s => find_index (curry (op =) s) seq + 1)
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      fun names_for_number j =
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        j |> AList.lookup (op =) name_map |> these
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          |> map_filter (try (unascii_of o unprefix_fact_number
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                              o unprefix fact_prefix))
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          |> map (fn name =>
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                     (name, name |> find_first_in_list_vector fact_names |> the)
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                     handle Option.Option =>
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                            error ("No such fact: " ^ quote name ^ "."))
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    in
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      (conjecture_shape |> map (maps renumber_conjecture),
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       seq |> map names_for_number |> Vector.fromList)
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    end
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  else
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    (conjecture_shape, fact_names)
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val vampire_step_prefix = "f" (* grrr... *)
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fun resolve_fact _ fact_names ((_, SOME s)) =
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    (case try (unprefix fact_prefix) s of
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       SOME s' =>
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       let val s' = s' |> unprefix_fact_number |> unascii_of in
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         case find_first_in_list_vector fact_names s' of
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           SOME x => [(s', x)]
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         | NONE => []
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       end
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     | NONE => [])
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  | resolve_fact facts_offset fact_names (num, NONE) =
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    case Int.fromString (perhaps (try (unprefix vampire_step_prefix)) num) of
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      SOME j =>
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      let val j = j - facts_offset in
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        if j > 0 andalso j <= Vector.length fact_names then
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          Vector.sub (fact_names, j - 1)
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        else
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          []
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      end
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    | NONE => []
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fun resolve_conjecture conjecture_shape (num, s_opt) =
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  let
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    val k = case try (unprefix conjecture_prefix) (the_default "" s_opt) of
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              SOME s => Int.fromString s |> the_default ~1
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            | NONE => case Int.fromString num of
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                        SOME j => find_index (exists (curry (op =) j))
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                                             conjecture_shape
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                      | NONE => ~1
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  in if k >= 0 then [k] else [] end
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fun is_fact conjecture_shape = not o null o resolve_fact 0 conjecture_shape
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fun is_conjecture conjecture_shape =
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  not o null o resolve_conjecture conjecture_shape
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fun add_fact facts_offset fact_names (Inference (name, _, [])) =
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    append (resolve_fact facts_offset fact_names name)
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  | add_fact _ _ _ = I
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fun used_facts_in_atp_proof facts_offset fact_names atp_proof =
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  if null atp_proof then Vector.foldl (op @) [] fact_names
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  else fold (add_fact facts_offset fact_names) atp_proof []
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fun is_conjecture_referred_to_in_proof conjecture_shape =
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  exists (fn Inference (name, _, []) => is_conjecture conjecture_shape name
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           | _ => false)
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fun is_unsound_proof conjecture_shape facts_offset fact_names =
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  not o is_conjecture_referred_to_in_proof conjecture_shape andf
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  forall (is_global_locality o snd)
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  o used_facts_in_atp_proof facts_offset fact_names
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(** Soft-core proof reconstruction: Metis one-liner **)
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fun string_for_label (s, num) = s ^ string_of_int num
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fun set_settings "" = ""
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  | set_settings settings = "using [[" ^ settings ^ "]] "
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fun apply_on_subgoal settings _ 1 = set_settings settings ^ "by "
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  | apply_on_subgoal settings 1 _ = set_settings settings ^ "apply "
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  | apply_on_subgoal settings i n =
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    "prefer " ^ string_of_int i ^ " " ^ apply_on_subgoal settings 1 n
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fun command_call name [] = name
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  | command_call name args = "(" ^ name ^ " " ^ space_implode " " args ^ ")"
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fun try_command_line banner command =
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  banner ^ ": " ^ Markup.markup Markup.sendback command ^ "."
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fun using_labels [] = ""
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  | using_labels ls =
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    "using " ^ space_implode " " (map string_for_label ls) ^ " "
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fun metis_name type_sys =
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  if type_system_types_dangerous_types type_sys then "metisFT" else "metis"
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fun metis_call type_sys ss = command_call (metis_name type_sys) ss
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fun metis_command type_sys i n (ls, ss) =
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  using_labels ls ^ apply_on_subgoal "" i n ^ metis_call type_sys ss
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fun metis_line banner type_sys i n ss =
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  try_command_line banner (metis_command type_sys i n ([], ss))
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fun minimize_line _ [] = ""
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  | minimize_line minimize_command ss =
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    case minimize_command ss of
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      "" => ""
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    | command =>
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      "\nTo minimize the number of lemmas, try this: " ^
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      Markup.markup Markup.sendback command ^ "."
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val split_used_facts =
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  List.partition (curry (op =) Chained o snd)
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  #> pairself (sort_distinct (string_ord o pairself fst))
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fun metis_proof_text (banner, type_sys, minimize_command, atp_proof,
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                      facts_offset, fact_names, goal, i) =
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  let
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    val (chained_lemmas, other_lemmas) =
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      atp_proof |> used_facts_in_atp_proof facts_offset fact_names
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                |> split_used_facts
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    val n = Logic.count_prems (prop_of goal)
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  in
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    (metis_line banner type_sys i n (map fst other_lemmas) ^
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     minimize_line minimize_command (map fst (other_lemmas @ chained_lemmas)),
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     other_lemmas @ chained_lemmas)
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  end
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(** Hard-core proof reconstruction: structured Isar proofs **)
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(* Simple simplifications to ensure that sort annotations don't leave a trail of
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   spurious "True"s. *)
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fun s_not @{const False} = @{const True}
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  | s_not @{const True} = @{const False}
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  | s_not (@{const Not} $ t) = t
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  | s_not t = @{const Not} $ t
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fun s_conj (@{const True}, t2) = t2
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  | s_conj (t1, @{const True}) = t1
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  | s_conj p = HOLogic.mk_conj p
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fun s_disj (@{const False}, t2) = t2
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  | s_disj (t1, @{const False}) = t1
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  | s_disj p = HOLogic.mk_disj p
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fun s_imp (@{const True}, t2) = t2
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  | s_imp (t1, @{const False}) = s_not t1
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  | s_imp p = HOLogic.mk_imp p
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fun s_iff (@{const True}, t2) = t2
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  | s_iff (t1, @{const True}) = t1
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  | s_iff (t1, t2) = HOLogic.eq_const HOLogic.boolT $ t1 $ t2
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fun forall_of v t = HOLogic.all_const (fastype_of v) $ lambda v t
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fun exists_of v t = HOLogic.exists_const (fastype_of v) $ lambda v t
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fun negate_term (Const (@{const_name All}, T) $ Abs (s, T', t')) =
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    Const (@{const_name Ex}, T) $ Abs (s, T', negate_term t')
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  | negate_term (Const (@{const_name Ex}, T) $ Abs (s, T', t')) =
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    Const (@{const_name All}, T) $ Abs (s, T', negate_term t')
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  | negate_term (@{const HOL.implies} $ t1 $ t2) =
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    @{const HOL.conj} $ t1 $ negate_term t2
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  | negate_term (@{const HOL.conj} $ t1 $ t2) =
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    @{const HOL.disj} $ negate_term t1 $ negate_term t2
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  | negate_term (@{const HOL.disj} $ t1 $ t2) =
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    @{const HOL.conj} $ negate_term t1 $ negate_term t2
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  | negate_term (@{const Not} $ t) = t
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  | negate_term t = @{const Not} $ t
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val indent_size = 2
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val no_label = ("", ~1)
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val raw_prefix = "X"
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val assum_prefix = "A"
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val have_prefix = "F"
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fun raw_label_for_name conjecture_shape name =
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  case resolve_conjecture conjecture_shape name of
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    [j] => (conjecture_prefix, j)
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  | _ => case Int.fromString (fst name) of
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           SOME j => (raw_prefix, j)
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         | NONE => (raw_prefix ^ fst name, 0)
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(**** INTERPRETATION OF TSTP SYNTAX TREES ****)
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exception FO_TERM of string fo_term list
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exception FORMULA of (string, string, string fo_term) formula list
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exception SAME of unit
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(* Type variables are given the basic sort "HOL.type". Some will later be
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   constrained by information from type literals, or by type inference. *)
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fun type_from_fo_term tfrees (u as ATerm (a, us)) =
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  let val Ts = map (type_from_fo_term tfrees) us in
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    case strip_prefix_and_unascii type_const_prefix a of
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      SOME b => Type (invert_const b, Ts)
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    | NONE =>
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      if not (null us) then
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        raise FO_TERM [u]  (* only "tconst"s have type arguments *)
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      else case strip_prefix_and_unascii tfree_prefix a of
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        SOME b =>
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        let val s = "'" ^ b in
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          TFree (s, AList.lookup (op =) tfrees s |> the_default HOLogic.typeS)
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        end
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      | NONE =>
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        case strip_prefix_and_unascii tvar_prefix a of
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          SOME b => TVar (("'" ^ b, 0), HOLogic.typeS)
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        | NONE =>
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          (* Variable from the ATP, say "X1" *)
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          Type_Infer.param 0 (a, HOLogic.typeS)
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  end
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(* Type class literal applied to a type. Returns triple of polarity, class,
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   type. *)
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fun type_constraint_from_term pos tfrees (u as ATerm (a, us)) =
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  case (strip_prefix_and_unascii class_prefix a,
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        map (type_from_fo_term tfrees) us) of
blanchet@38014
   311
    (SOME b, [T]) => (pos, b, T)
blanchet@38014
   312
  | _ => raise FO_TERM [u]
blanchet@38014
   313
blanchet@38085
   314
(** Accumulate type constraints in a formula: negative type literals **)
blanchet@38014
   315
fun add_var (key, z)  = Vartab.map_default (key, []) (cons z)
blanchet@38014
   316
fun add_type_constraint (false, cl, TFree (a ,_)) = add_var ((a, ~1), cl)
blanchet@38014
   317
  | add_type_constraint (false, cl, TVar (ix, _)) = add_var (ix, cl)
blanchet@38014
   318
  | add_type_constraint _ = I
blanchet@38014
   319
blanchet@38490
   320
fun repair_atp_variable_name f s =
blanchet@36486
   321
  let
blanchet@36486
   322
    fun subscript_name s n = s ^ nat_subscript n
blanchet@38488
   323
    val s = String.map f s
blanchet@36486
   324
  in
blanchet@36486
   325
    case space_explode "_" s of
blanchet@36486
   326
      [_] => (case take_suffix Char.isDigit (String.explode s) of
blanchet@36486
   327
                (cs1 as _ :: _, cs2 as _ :: _) =>
blanchet@36486
   328
                subscript_name (String.implode cs1)
blanchet@36486
   329
                               (the (Int.fromString (String.implode cs2)))
blanchet@36486
   330
              | (_, _) => s)
blanchet@36486
   331
    | [s1, s2] => (case Int.fromString s2 of
blanchet@36486
   332
                     SOME n => subscript_name s1 n
blanchet@36486
   333
                   | NONE => s)
blanchet@36486
   334
    | _ => s
blanchet@36486
   335
  end
blanchet@36486
   336
blanchet@36909
   337
(* First-order translation. No types are known for variables. "HOLogic.typeT"
blanchet@38014
   338
   should allow them to be inferred. *)
blanchet@41136
   339
fun raw_term_from_pred thy type_sys tfrees =
blanchet@36909
   340
  let
blanchet@37643
   341
    fun aux opt_T extra_us u =
blanchet@36909
   342
      case u of
blanchet@42539
   343
        ATerm (a, us) =>
blanchet@42544
   344
        if a = type_tag_name then
blanchet@36909
   345
          case us of
blanchet@37643
   346
            [typ_u, term_u] =>
blanchet@37991
   347
            aux (SOME (type_from_fo_term tfrees typ_u)) extra_us term_u
blanchet@37991
   348
          | _ => raise FO_TERM us
blanchet@42551
   349
        else if String.isPrefix type_prefix a then
blanchet@42551
   350
          @{const True} (* ignore TFF type information *)
blanchet@38748
   351
        else case strip_prefix_and_unascii const_prefix a of
blanchet@36909
   352
          SOME "equal" =>
blanchet@39106
   353
          let val ts = map (aux NONE []) us in
blanchet@39106
   354
            if length ts = 2 andalso hd ts aconv List.last ts then
blanchet@39106
   355
              (* Vampire is keen on producing these. *)
blanchet@39106
   356
              @{const True}
blanchet@39106
   357
            else
blanchet@39106
   358
              list_comb (Const (@{const_name HOL.eq}, HOLogic.typeT), ts)
blanchet@39106
   359
          end
blanchet@36909
   360
        | SOME b =>
blanchet@42549
   361
          let val (b, mangled_us) = b |> unmangled_const |>> invert_const in
blanchet@42549
   362
            if b = boolify_base then
blanchet@42549
   363
              aux (SOME @{typ bool}) [] (hd us)
blanchet@42549
   364
            else if b = explicit_app_base then
blanchet@42549
   365
              aux opt_T (nth us 1 :: extra_us) (hd us)
blanchet@42549
   366
            else if b = type_pred_base then
blanchet@42551
   367
              @{const True} (* ignore type predicates *)
blanchet@42549
   368
            else
blanchet@42549
   369
              let
blanchet@42549
   370
                val num_ty_args = num_atp_type_args thy type_sys b
blanchet@42549
   371
                val (type_us, term_us) =
blanchet@42549
   372
                  chop num_ty_args us |>> append mangled_us
blanchet@42549
   373
                (* Extra args from "hAPP" come after any arguments given
blanchet@42549
   374
                   directly to the constant. *)
blanchet@42549
   375
                val term_ts = map (aux NONE []) term_us
blanchet@42549
   376
                val extra_ts = map (aux NONE []) extra_us
blanchet@42549
   377
                val T =
blanchet@42549
   378
                  case opt_T of
blanchet@42549
   379
                    SOME T => map fastype_of term_ts ---> T
blanchet@42549
   380
                  | NONE =>
blanchet@42549
   381
                    if num_type_args thy b = length type_us then
blanchet@42549
   382
                      Sign.const_instance thy
blanchet@42549
   383
                          (b, map (type_from_fo_term tfrees) type_us)
blanchet@42549
   384
                    else
blanchet@42549
   385
                      HOLogic.typeT
blanchet@42549
   386
              in list_comb (Const (b, T), term_ts @ extra_ts) end
blanchet@42549
   387
          end
blanchet@36909
   388
        | NONE => (* a free or schematic variable *)
blanchet@36909
   389
          let
blanchet@37643
   390
            val ts = map (aux NONE []) (us @ extra_us)
blanchet@36909
   391
            val T = map fastype_of ts ---> HOLogic.typeT
blanchet@36909
   392
            val t =
blanchet@38748
   393
              case strip_prefix_and_unascii fixed_var_prefix a of
blanchet@36909
   394
                SOME b => Free (b, T)
blanchet@36909
   395
              | NONE =>
blanchet@38748
   396
                case strip_prefix_and_unascii schematic_var_prefix a of
blanchet@36967
   397
                  SOME b => Var ((b, 0), T)
blanchet@36909
   398
                | NONE =>
blanchet@39452
   399
                  if is_atp_variable a then
blanchet@38490
   400
                    Var ((repair_atp_variable_name Char.toLower a, 0), T)
blanchet@38017
   401
                  else
blanchet@38488
   402
                    (* Skolem constants? *)
blanchet@38490
   403
                    Var ((repair_atp_variable_name Char.toUpper a, 0), T)
blanchet@36909
   404
          in list_comb (t, ts) end
blanchet@38014
   405
  in aux (SOME HOLogic.boolT) [] end
paulson@21978
   406
blanchet@41136
   407
fun term_from_pred thy type_sys tfrees pos (u as ATerm (s, _)) =
blanchet@38014
   408
  if String.isPrefix class_prefix s then
blanchet@38014
   409
    add_type_constraint (type_constraint_from_term pos tfrees u)
blanchet@38014
   410
    #> pair @{const True}
blanchet@38014
   411
  else
blanchet@41136
   412
    pair (raw_term_from_pred thy type_sys tfrees u)
blanchet@36402
   413
blanchet@36555
   414
val combinator_table =
blanchet@39953
   415
  [(@{const_name Meson.COMBI}, @{thm Meson.COMBI_def_raw}),
blanchet@39953
   416
   (@{const_name Meson.COMBK}, @{thm Meson.COMBK_def_raw}),
blanchet@39953
   417
   (@{const_name Meson.COMBB}, @{thm Meson.COMBB_def_raw}),
blanchet@39953
   418
   (@{const_name Meson.COMBC}, @{thm Meson.COMBC_def_raw}),
blanchet@39953
   419
   (@{const_name Meson.COMBS}, @{thm Meson.COMBS_def_raw})]
blanchet@36555
   420
blanchet@36555
   421
fun uncombine_term (t1 $ t2) = betapply (pairself uncombine_term (t1, t2))
blanchet@36555
   422
  | uncombine_term (Abs (s, T, t')) = Abs (s, T, uncombine_term t')
blanchet@36555
   423
  | uncombine_term (t as Const (x as (s, _))) =
blanchet@36555
   424
    (case AList.lookup (op =) combinator_table s of
blanchet@42227
   425
       SOME thm => thm |> prop_of |> specialize_type @{theory} x
blanchet@42227
   426
                       |> Logic.dest_equals |> snd
blanchet@36555
   427
     | NONE => t)
blanchet@36555
   428
  | uncombine_term t = t
blanchet@36555
   429
blanchet@37991
   430
(* Update schematic type variables with detected sort constraints. It's not
blanchet@37991
   431
   totally clear when this code is necessary. *)
blanchet@38014
   432
fun repair_tvar_sorts (t, tvar_tab) =
blanchet@36909
   433
  let
blanchet@37991
   434
    fun do_type (Type (a, Ts)) = Type (a, map do_type Ts)
blanchet@37991
   435
      | do_type (TVar (xi, s)) =
blanchet@37991
   436
        TVar (xi, the_default s (Vartab.lookup tvar_tab xi))
blanchet@37991
   437
      | do_type (TFree z) = TFree z
blanchet@37991
   438
    fun do_term (Const (a, T)) = Const (a, do_type T)
blanchet@37991
   439
      | do_term (Free (a, T)) = Free (a, do_type T)
blanchet@37991
   440
      | do_term (Var (xi, T)) = Var (xi, do_type T)
blanchet@37991
   441
      | do_term (t as Bound _) = t
blanchet@37991
   442
      | do_term (Abs (a, T, t)) = Abs (a, do_type T, do_term t)
blanchet@37991
   443
      | do_term (t1 $ t2) = do_term t1 $ do_term t2
blanchet@37991
   444
  in t |> not (Vartab.is_empty tvar_tab) ? do_term end
blanchet@37991
   445
blanchet@39425
   446
fun quantify_over_var quant_of var_s t =
blanchet@39425
   447
  let
blanchet@39425
   448
    val vars = [] |> Term.add_vars t |> filter (fn ((s, _), _) => s = var_s)
blanchet@39425
   449
                  |> map Var
blanchet@39425
   450
  in fold_rev quant_of vars t end
blanchet@37991
   451
blanchet@38085
   452
(* Interpret an ATP formula as a HOL term, extracting sort constraints as they
blanchet@38085
   453
   appear in the formula. *)
blanchet@41136
   454
fun prop_from_formula thy type_sys tfrees phi =
blanchet@38014
   455
  let
blanchet@38014
   456
    fun do_formula pos phi =
blanchet@37991
   457
      case phi of
blanchet@38014
   458
        AQuant (_, [], phi) => do_formula pos phi
blanchet@42526
   459
      | AQuant (q, (s, _) :: xs, phi') =>
blanchet@38014
   460
        do_formula pos (AQuant (q, xs, phi'))
blanchet@42526
   461
        (* FIXME: TFF *)
blanchet@39425
   462
        #>> quantify_over_var (case q of
blanchet@39425
   463
                                 AForall => forall_of
blanchet@39425
   464
                               | AExists => exists_of)
blanchet@42526
   465
                              (repair_atp_variable_name Char.toLower s)
blanchet@38014
   466
      | AConn (ANot, [phi']) => do_formula (not pos) phi' #>> s_not
blanchet@37991
   467
      | AConn (c, [phi1, phi2]) =>
blanchet@38014
   468
        do_formula (pos |> c = AImplies ? not) phi1
blanchet@38014
   469
        ##>> do_formula pos phi2
blanchet@38014
   470
        #>> (case c of
blanchet@38014
   471
               AAnd => s_conj
blanchet@38014
   472
             | AOr => s_disj
blanchet@38014
   473
             | AImplies => s_imp
blanchet@38038
   474
             | AIf => s_imp o swap
blanchet@38038
   475
             | AIff => s_iff
blanchet@40069
   476
             | ANotIff => s_not o s_iff
blanchet@40069
   477
             | _ => raise Fail "unexpected connective")
blanchet@41136
   478
      | AAtom tm => term_from_pred thy type_sys tfrees pos tm
blanchet@37991
   479
      | _ => raise FORMULA [phi]
blanchet@38014
   480
  in repair_tvar_sorts (do_formula true phi Vartab.empty) end
blanchet@37991
   481
blanchet@36556
   482
fun check_formula ctxt =
wenzelm@39288
   483
  Type.constraint HOLogic.boolT
wenzelm@42361
   484
  #> Syntax.check_term (Proof_Context.set_mode Proof_Context.mode_schematic ctxt)
paulson@21978
   485
paulson@21978
   486
paulson@21978
   487
(**** Translation of TSTP files to Isar Proofs ****)
paulson@21978
   488
blanchet@36486
   489
fun unvarify_term (Var ((s, 0), T)) = Free (s, T)
blanchet@36486
   490
  | unvarify_term t = raise TERM ("unvarify_term: non-Var", [t])
paulson@21978
   491
blanchet@41136
   492
fun decode_line type_sys tfrees (Definition (name, phi1, phi2)) ctxt =
blanchet@36486
   493
    let
wenzelm@42361
   494
      val thy = Proof_Context.theory_of ctxt
blanchet@41136
   495
      val t1 = prop_from_formula thy type_sys tfrees phi1
blanchet@36551
   496
      val vars = snd (strip_comb t1)
blanchet@36486
   497
      val frees = map unvarify_term vars
blanchet@36486
   498
      val unvarify_args = subst_atomic (vars ~~ frees)
blanchet@41136
   499
      val t2 = prop_from_formula thy type_sys tfrees phi2
blanchet@36551
   500
      val (t1, t2) =
blanchet@36551
   501
        HOLogic.eq_const HOLogic.typeT $ t1 $ t2
blanchet@36556
   502
        |> unvarify_args |> uncombine_term |> check_formula ctxt
blanchet@36555
   503
        |> HOLogic.dest_eq
blanchet@36486
   504
    in
blanchet@39368
   505
      (Definition (name, t1, t2),
blanchet@36551
   506
       fold Variable.declare_term (maps OldTerm.term_frees [t1, t2]) ctxt)
blanchet@36486
   507
    end
blanchet@41136
   508
  | decode_line type_sys tfrees (Inference (name, u, deps)) ctxt =
blanchet@36551
   509
    let
wenzelm@42361
   510
      val thy = Proof_Context.theory_of ctxt
blanchet@41136
   511
      val t = u |> prop_from_formula thy type_sys tfrees
blanchet@37998
   512
                |> uncombine_term |> check_formula ctxt
blanchet@36551
   513
    in
blanchet@39368
   514
      (Inference (name, t, deps),
blanchet@36551
   515
       fold Variable.declare_term (OldTerm.term_frees t) ctxt)
blanchet@36486
   516
    end
blanchet@41136
   517
fun decode_lines ctxt type_sys tfrees lines =
blanchet@41136
   518
  fst (fold_map (decode_line type_sys tfrees) lines ctxt)
paulson@21978
   519
blanchet@38035
   520
fun is_same_inference _ (Definition _) = false
blanchet@38035
   521
  | is_same_inference t (Inference (_, t', _)) = t aconv t'
blanchet@36486
   522
blanchet@36486
   523
(* No "real" literals means only type information (tfree_tcs, clsrel, or
blanchet@36486
   524
   clsarity). *)
blanchet@36486
   525
val is_only_type_information = curry (op aconv) HOLogic.true_const
blanchet@36486
   526
blanchet@39373
   527
fun replace_one_dependency (old, new) dep =
blanchet@39452
   528
  if is_same_step (dep, old) then new else [dep]
blanchet@39373
   529
fun replace_dependencies_in_line _ (line as Definition _) = line
blanchet@39373
   530
  | replace_dependencies_in_line p (Inference (name, t, deps)) =
blanchet@39373
   531
    Inference (name, t, fold (union (op =) o replace_one_dependency p) deps [])
paulson@21978
   532
blanchet@40204
   533
(* Discard facts; consolidate adjacent lines that prove the same formula, since
blanchet@38085
   534
   they differ only in type information.*)
blanchet@36551
   535
fun add_line _ _ (line as Definition _) lines = line :: lines
blanchet@40204
   536
  | add_line conjecture_shape fact_names (Inference (name, t, [])) lines =
blanchet@40204
   537
    (* No dependencies: fact, conjecture, or (for Vampire) internal facts or
blanchet@38085
   538
       definitions. *)
blanchet@40204
   539
    if is_fact fact_names name then
blanchet@40204
   540
      (* Facts are not proof lines. *)
blanchet@36486
   541
      if is_only_type_information t then
blanchet@39373
   542
        map (replace_dependencies_in_line (name, [])) lines
blanchet@36486
   543
      (* Is there a repetition? If so, replace later line by earlier one. *)
blanchet@38035
   544
      else case take_prefix (not o is_same_inference t) lines of
blanchet@39373
   545
        (_, []) => lines (* no repetition of proof line *)
blanchet@39368
   546
      | (pre, Inference (name', _, _) :: post) =>
blanchet@39373
   547
        pre @ map (replace_dependencies_in_line (name', [name])) post
blanchet@40069
   548
      | _ => raise Fail "unexpected inference"
blanchet@39370
   549
    else if is_conjecture conjecture_shape name then
blanchet@39368
   550
      Inference (name, negate_term t, []) :: lines
blanchet@36551
   551
    else
blanchet@39373
   552
      map (replace_dependencies_in_line (name, [])) lines
blanchet@39368
   553
  | add_line _ _ (Inference (name, t, deps)) lines =
blanchet@36486
   554
    (* Type information will be deleted later; skip repetition test. *)
blanchet@36486
   555
    if is_only_type_information t then
blanchet@39368
   556
      Inference (name, t, deps) :: lines
blanchet@36486
   557
    (* Is there a repetition? If so, replace later line by earlier one. *)
blanchet@38035
   558
    else case take_prefix (not o is_same_inference t) lines of
blanchet@36486
   559
      (* FIXME: Doesn't this code risk conflating proofs involving different
blanchet@38035
   560
         types? *)
blanchet@39368
   561
       (_, []) => Inference (name, t, deps) :: lines
blanchet@39368
   562
     | (pre, Inference (name', t', _) :: post) =>
blanchet@39368
   563
       Inference (name, t', deps) ::
blanchet@39373
   564
       pre @ map (replace_dependencies_in_line (name', [name])) post
blanchet@40069
   565
     | _ => raise Fail "unexpected inference"
paulson@22044
   566
blanchet@36486
   567
(* Recursively delete empty lines (type information) from the proof. *)
blanchet@39368
   568
fun add_nontrivial_line (Inference (name, t, [])) lines =
blanchet@39373
   569
    if is_only_type_information t then delete_dependency name lines
blanchet@39368
   570
    else Inference (name, t, []) :: lines
blanchet@36486
   571
  | add_nontrivial_line line lines = line :: lines
blanchet@39373
   572
and delete_dependency name lines =
blanchet@39373
   573
  fold_rev add_nontrivial_line
blanchet@39373
   574
           (map (replace_dependencies_in_line (name, [])) lines) []
blanchet@36486
   575
blanchet@37323
   576
(* ATPs sometimes reuse free variable names in the strangest ways. Removing
blanchet@37323
   577
   offending lines often does the trick. *)
blanchet@36560
   578
fun is_bad_free frees (Free x) = not (member (op =) frees x)
blanchet@36560
   579
  | is_bad_free _ _ = false
paulson@22470
   580
blanchet@39368
   581
fun add_desired_line _ _ _ _ (line as Definition (name, _, _)) (j, lines) =
blanchet@39373
   582
    (j, line :: map (replace_dependencies_in_line (name, [])) lines)
blanchet@40204
   583
  | add_desired_line isar_shrink_factor conjecture_shape fact_names frees
blanchet@39368
   584
                     (Inference (name, t, deps)) (j, lines) =
blanchet@36402
   585
    (j + 1,
blanchet@40204
   586
     if is_fact fact_names name orelse
blanchet@39370
   587
        is_conjecture conjecture_shape name orelse
blanchet@39373
   588
        (* the last line must be kept *)
blanchet@39373
   589
        j = 0 orelse
blanchet@36570
   590
        (not (is_only_type_information t) andalso
blanchet@36570
   591
         null (Term.add_tvars t []) andalso
blanchet@36570
   592
         not (exists_subterm (is_bad_free frees) t) andalso
blanchet@39373
   593
         length deps >= 2 andalso j mod isar_shrink_factor = 0 andalso
blanchet@39373
   594
         (* kill next to last line, which usually results in a trivial step *)
blanchet@39373
   595
         j <> 1) then
blanchet@39368
   596
       Inference (name, t, deps) :: lines  (* keep line *)
blanchet@36402
   597
     else
blanchet@39373
   598
       map (replace_dependencies_in_line (name, deps)) lines)  (* drop line *)
paulson@21978
   599
blanchet@36486
   600
(** Isar proof construction and manipulation **)
blanchet@36486
   601
blanchet@36486
   602
fun merge_fact_sets (ls1, ss1) (ls2, ss2) =
blanchet@36486
   603
  (union (op =) ls1 ls2, union (op =) ss1 ss2)
blanchet@36402
   604
blanchet@36402
   605
type label = string * int
blanchet@36402
   606
type facts = label list * string list
blanchet@36402
   607
blanchet@39452
   608
datatype isar_qualifier = Show | Then | Moreover | Ultimately
blanchet@36291
   609
blanchet@39452
   610
datatype isar_step =
blanchet@36478
   611
  Fix of (string * typ) list |
blanchet@36486
   612
  Let of term * term |
blanchet@36402
   613
  Assume of label * term |
blanchet@39452
   614
  Have of isar_qualifier list * label * term * byline
blanchet@36402
   615
and byline =
blanchet@36564
   616
  ByMetis of facts |
blanchet@39452
   617
  CaseSplit of isar_step list list * facts
blanchet@36402
   618
blanchet@36574
   619
fun smart_case_split [] facts = ByMetis facts
blanchet@36574
   620
  | smart_case_split proofs facts = CaseSplit (proofs, facts)
blanchet@36574
   621
blanchet@42541
   622
fun add_fact_from_dependency conjecture_shape facts_offset fact_names name =
blanchet@40204
   623
  if is_fact fact_names name then
blanchet@42541
   624
    apsnd (union (op =) (map fst (resolve_fact facts_offset fact_names name)))
blanchet@36475
   625
  else
blanchet@39370
   626
    apfst (insert (op =) (raw_label_for_name conjecture_shape name))
blanchet@36402
   627
blanchet@42541
   628
fun step_for_line _ _ _ _ (Definition (_, t1, t2)) = Let (t1, t2)
blanchet@42541
   629
  | step_for_line conjecture_shape _ _ _ (Inference (name, t, [])) =
blanchet@39370
   630
    Assume (raw_label_for_name conjecture_shape name, t)
blanchet@42541
   631
  | step_for_line conjecture_shape facts_offset fact_names j
blanchet@42541
   632
                  (Inference (name, t, deps)) =
blanchet@39370
   633
    Have (if j = 1 then [Show] else [],
blanchet@39425
   634
          raw_label_for_name conjecture_shape name,
blanchet@39425
   635
          fold_rev forall_of (map Var (Term.add_vars t [])) t,
blanchet@42541
   636
          ByMetis (fold (add_fact_from_dependency conjecture_shape facts_offset
blanchet@42541
   637
                                                  fact_names)
blanchet@39373
   638
                        deps ([], [])))
blanchet@36291
   639
blanchet@39454
   640
fun repair_name "$true" = "c_True"
blanchet@39454
   641
  | repair_name "$false" = "c_False"
blanchet@39454
   642
  | repair_name "$$e" = "c_equal" (* seen in Vampire proofs *)
blanchet@39454
   643
  | repair_name "equal" = "c_equal" (* needed by SPASS? *)
blanchet@39454
   644
  | repair_name s =
blanchet@39454
   645
    if String.isPrefix "sQ" s andalso String.isSuffix "_eqProxy" s then
blanchet@39454
   646
      "c_equal" (* seen in Vampire proofs *)
blanchet@39454
   647
    else
blanchet@39454
   648
      s
blanchet@39454
   649
blanchet@42449
   650
fun isar_proof_from_atp_proof pool ctxt type_sys tfrees isar_shrink_factor
blanchet@42541
   651
        atp_proof conjecture_shape facts_offset fact_names params frees =
blanchet@36402
   652
  let
blanchet@36486
   653
    val lines =
blanchet@42449
   654
      atp_proof
blanchet@39454
   655
      |> nasty_atp_proof pool
blanchet@39454
   656
      |> map_term_names_in_atp_proof repair_name
blanchet@41136
   657
      |> decode_lines ctxt type_sys tfrees
blanchet@40204
   658
      |> rpair [] |-> fold_rev (add_line conjecture_shape fact_names)
blanchet@36486
   659
      |> rpair [] |-> fold_rev add_nontrivial_line
blanchet@37498
   660
      |> rpair (0, []) |-> fold_rev (add_desired_line isar_shrink_factor
blanchet@40204
   661
                                             conjecture_shape fact_names frees)
blanchet@36486
   662
      |> snd
blanchet@36402
   663
  in
blanchet@36909
   664
    (if null params then [] else [Fix params]) @
blanchet@42541
   665
    map2 (step_for_line conjecture_shape facts_offset fact_names)
blanchet@42541
   666
         (length lines downto 1) lines
blanchet@36402
   667
  end
blanchet@36402
   668
blanchet@36402
   669
(* When redirecting proofs, we keep information about the labels seen so far in
blanchet@36402
   670
   the "backpatches" data structure. The first component indicates which facts
blanchet@36402
   671
   should be associated with forthcoming proof steps. The second component is a
blanchet@37322
   672
   pair ("assum_ls", "drop_ls"), where "assum_ls" are the labels that should
blanchet@37322
   673
   become assumptions and "drop_ls" are the labels that should be dropped in a
blanchet@37322
   674
   case split. *)
blanchet@36402
   675
type backpatches = (label * facts) list * (label list * label list)
blanchet@36402
   676
blanchet@36556
   677
fun used_labels_of_step (Have (_, _, _, by)) =
blanchet@36402
   678
    (case by of
blanchet@36564
   679
       ByMetis (ls, _) => ls
blanchet@36556
   680
     | CaseSplit (proofs, (ls, _)) =>
blanchet@36556
   681
       fold (union (op =) o used_labels_of) proofs ls)
blanchet@36556
   682
  | used_labels_of_step _ = []
blanchet@36556
   683
and used_labels_of proof = fold (union (op =) o used_labels_of_step) proof []
blanchet@36402
   684
blanchet@36402
   685
fun new_labels_of_step (Fix _) = []
blanchet@36486
   686
  | new_labels_of_step (Let _) = []
blanchet@36402
   687
  | new_labels_of_step (Assume (l, _)) = [l]
blanchet@36402
   688
  | new_labels_of_step (Have (_, l, _, _)) = [l]
blanchet@36402
   689
val new_labels_of = maps new_labels_of_step
blanchet@36402
   690
blanchet@36402
   691
val join_proofs =
blanchet@36402
   692
  let
blanchet@36402
   693
    fun aux _ [] = NONE
blanchet@36402
   694
      | aux proof_tail (proofs as (proof1 :: _)) =
blanchet@36402
   695
        if exists null proofs then
blanchet@36402
   696
          NONE
blanchet@36402
   697
        else if forall (curry (op =) (hd proof1) o hd) (tl proofs) then
blanchet@36402
   698
          aux (hd proof1 :: proof_tail) (map tl proofs)
blanchet@36402
   699
        else case hd proof1 of
blanchet@37498
   700
          Have ([], l, t, _) => (* FIXME: should we really ignore the "by"? *)
blanchet@36402
   701
          if forall (fn Have ([], l', t', _) :: _ => (l, t) = (l', t')
blanchet@36402
   702
                      | _ => false) (tl proofs) andalso
blanchet@36402
   703
             not (exists (member (op =) (maps new_labels_of proofs))
blanchet@36556
   704
                         (used_labels_of proof_tail)) then
blanchet@36402
   705
            SOME (l, t, map rev proofs, proof_tail)
blanchet@36402
   706
          else
blanchet@36402
   707
            NONE
blanchet@36402
   708
        | _ => NONE
blanchet@36402
   709
  in aux [] o map rev end
blanchet@36402
   710
blanchet@36402
   711
fun case_split_qualifiers proofs =
blanchet@36402
   712
  case length proofs of
blanchet@36402
   713
    0 => []
blanchet@36402
   714
  | 1 => [Then]
blanchet@36402
   715
  | _ => [Ultimately]
blanchet@36402
   716
blanchet@39372
   717
fun redirect_proof hyp_ts concl_t proof =
wenzelm@33310
   718
  let
blanchet@37324
   719
    (* The first pass outputs those steps that are independent of the negated
blanchet@37324
   720
       conjecture. The second pass flips the proof by contradiction to obtain a
blanchet@37324
   721
       direct proof, introducing case splits when an inference depends on
blanchet@37324
   722
       several facts that depend on the negated conjecture. *)
blanchet@39372
   723
     val concl_l = (conjecture_prefix, length hyp_ts)
blanchet@38040
   724
     fun first_pass ([], contra) = ([], contra)
blanchet@38040
   725
       | first_pass ((step as Fix _) :: proof, contra) =
blanchet@38040
   726
         first_pass (proof, contra) |>> cons step
blanchet@38040
   727
       | first_pass ((step as Let _) :: proof, contra) =
blanchet@38040
   728
         first_pass (proof, contra) |>> cons step
blanchet@39370
   729
       | first_pass ((step as Assume (l as (_, j), _)) :: proof, contra) =
blanchet@39372
   730
         if l = concl_l then first_pass (proof, contra ||> cons step)
blanchet@39372
   731
         else first_pass (proof, contra) |>> cons (Assume (l, nth hyp_ts j))
blanchet@38040
   732
       | first_pass (Have (qs, l, t, ByMetis (ls, ss)) :: proof, contra) =
blanchet@39372
   733
         let val step = Have (qs, l, t, ByMetis (ls, ss)) in
blanchet@38040
   734
           if exists (member (op =) (fst contra)) ls then
blanchet@38040
   735
             first_pass (proof, contra |>> cons l ||> cons step)
blanchet@38040
   736
           else
blanchet@38040
   737
             first_pass (proof, contra) |>> cons step
blanchet@38040
   738
         end
blanchet@38040
   739
       | first_pass _ = raise Fail "malformed proof"
blanchet@36402
   740
    val (proof_top, (contra_ls, contra_proof)) =
blanchet@39372
   741
      first_pass (proof, ([concl_l], []))
blanchet@36402
   742
    val backpatch_label = the_default ([], []) oo AList.lookup (op =) o fst
blanchet@36402
   743
    fun backpatch_labels patches ls =
blanchet@36402
   744
      fold merge_fact_sets (map (backpatch_label patches) ls) ([], [])
blanchet@36402
   745
    fun second_pass end_qs ([], assums, patches) =
blanchet@37324
   746
        ([Have (end_qs, no_label, concl_t,
blanchet@36564
   747
                ByMetis (backpatch_labels patches (map snd assums)))], patches)
blanchet@36402
   748
      | second_pass end_qs (Assume (l, t) :: proof, assums, patches) =
blanchet@36402
   749
        second_pass end_qs (proof, (t, l) :: assums, patches)
blanchet@36564
   750
      | second_pass end_qs (Have (qs, l, t, ByMetis (ls, ss)) :: proof, assums,
blanchet@36402
   751
                            patches) =
blanchet@39373
   752
        (if member (op =) (snd (snd patches)) l andalso
blanchet@39373
   753
            not (member (op =) (fst (snd patches)) l) andalso
blanchet@39373
   754
            not (AList.defined (op =) (fst patches) l) then
blanchet@39373
   755
           second_pass end_qs (proof, assums, patches ||> apsnd (append ls))
blanchet@39373
   756
         else case List.partition (member (op =) contra_ls) ls of
blanchet@39373
   757
           ([contra_l], co_ls) =>
blanchet@39373
   758
           if member (op =) qs Show then
blanchet@39373
   759
             second_pass end_qs (proof, assums,
blanchet@39373
   760
                                 patches |>> cons (contra_l, (co_ls, ss)))
blanchet@39373
   761
           else
blanchet@39373
   762
             second_pass end_qs
blanchet@39373
   763
                         (proof, assums,
blanchet@39373
   764
                          patches |>> cons (contra_l, (l :: co_ls, ss)))
blanchet@39373
   765
             |>> cons (if member (op =) (fst (snd patches)) l then
blanchet@39373
   766
                         Assume (l, negate_term t)
blanchet@39373
   767
                       else
blanchet@39373
   768
                         Have (qs, l, negate_term t,
blanchet@39373
   769
                               ByMetis (backpatch_label patches l)))
blanchet@39373
   770
         | (contra_ls as _ :: _, co_ls) =>
blanchet@39373
   771
           let
blanchet@39373
   772
             val proofs =
blanchet@39373
   773
               map_filter
blanchet@39373
   774
                   (fn l =>
blanchet@39373
   775
                       if l = concl_l then
blanchet@39373
   776
                         NONE
blanchet@39373
   777
                       else
blanchet@39373
   778
                         let
blanchet@39373
   779
                           val drop_ls = filter (curry (op <>) l) contra_ls
blanchet@39373
   780
                         in
blanchet@39373
   781
                           second_pass []
blanchet@39373
   782
                               (proof, assums,
blanchet@39373
   783
                                patches ||> apfst (insert (op =) l)
blanchet@39373
   784
                                        ||> apsnd (union (op =) drop_ls))
blanchet@39373
   785
                           |> fst |> SOME
blanchet@39373
   786
                         end) contra_ls
blanchet@39373
   787
             val (assumes, facts) =
blanchet@39373
   788
               if member (op =) (fst (snd patches)) l then
blanchet@39373
   789
                 ([Assume (l, negate_term t)], (l :: co_ls, ss))
blanchet@39373
   790
               else
blanchet@39373
   791
                 ([], (co_ls, ss))
blanchet@39373
   792
           in
blanchet@39373
   793
             (case join_proofs proofs of
blanchet@39373
   794
                SOME (l, t, proofs, proof_tail) =>
blanchet@39373
   795
                Have (case_split_qualifiers proofs @
blanchet@39373
   796
                      (if null proof_tail then end_qs else []), l, t,
blanchet@39373
   797
                      smart_case_split proofs facts) :: proof_tail
blanchet@39373
   798
              | NONE =>
blanchet@39373
   799
                [Have (case_split_qualifiers proofs @ end_qs, no_label,
blanchet@39373
   800
                       concl_t, smart_case_split proofs facts)],
blanchet@39373
   801
              patches)
blanchet@39373
   802
             |>> append assumes
blanchet@39373
   803
           end
blanchet@39373
   804
         | _ => raise Fail "malformed proof")
blanchet@36402
   805
       | second_pass _ _ = raise Fail "malformed proof"
blanchet@36486
   806
    val proof_bottom =
blanchet@36486
   807
      second_pass [Show] (contra_proof, [], ([], ([], []))) |> fst
blanchet@36402
   808
  in proof_top @ proof_bottom end
blanchet@36402
   809
blanchet@38490
   810
(* FIXME: Still needed? Probably not. *)
blanchet@36402
   811
val kill_duplicate_assumptions_in_proof =
blanchet@36402
   812
  let
blanchet@36402
   813
    fun relabel_facts subst =
blanchet@36402
   814
      apfst (map (fn l => AList.lookup (op =) subst l |> the_default l))
blanchet@36491
   815
    fun do_step (step as Assume (l, t)) (proof, subst, assums) =
blanchet@36402
   816
        (case AList.lookup (op aconv) assums t of
blanchet@36967
   817
           SOME l' => (proof, (l, l') :: subst, assums)
blanchet@36491
   818
         | NONE => (step :: proof, subst, (t, l) :: assums))
blanchet@36402
   819
      | do_step (Have (qs, l, t, by)) (proof, subst, assums) =
blanchet@36402
   820
        (Have (qs, l, t,
blanchet@36402
   821
               case by of
blanchet@36564
   822
                 ByMetis facts => ByMetis (relabel_facts subst facts)
blanchet@36402
   823
               | CaseSplit (proofs, facts) =>
blanchet@36402
   824
                 CaseSplit (map do_proof proofs, relabel_facts subst facts)) ::
blanchet@36402
   825
         proof, subst, assums)
blanchet@36491
   826
      | do_step step (proof, subst, assums) = (step :: proof, subst, assums)
blanchet@36402
   827
    and do_proof proof = fold do_step proof ([], [], []) |> #1 |> rev
blanchet@36402
   828
  in do_proof end
blanchet@36402
   829
blanchet@36402
   830
val then_chain_proof =
blanchet@36402
   831
  let
blanchet@36402
   832
    fun aux _ [] = []
blanchet@36491
   833
      | aux _ ((step as Assume (l, _)) :: proof) = step :: aux l proof
blanchet@36402
   834
      | aux l' (Have (qs, l, t, by) :: proof) =
blanchet@36402
   835
        (case by of
blanchet@36564
   836
           ByMetis (ls, ss) =>
blanchet@36402
   837
           Have (if member (op =) ls l' then
blanchet@36402
   838
                   (Then :: qs, l, t,
blanchet@36564
   839
                    ByMetis (filter_out (curry (op =) l') ls, ss))
blanchet@36402
   840
                 else
blanchet@36564
   841
                   (qs, l, t, ByMetis (ls, ss)))
blanchet@36402
   842
         | CaseSplit (proofs, facts) =>
blanchet@36402
   843
           Have (qs, l, t, CaseSplit (map (aux no_label) proofs, facts))) ::
blanchet@36402
   844
        aux l proof
blanchet@36491
   845
      | aux _ (step :: proof) = step :: aux no_label proof
blanchet@36402
   846
  in aux no_label end
blanchet@36402
   847
blanchet@36402
   848
fun kill_useless_labels_in_proof proof =
blanchet@36402
   849
  let
blanchet@36556
   850
    val used_ls = used_labels_of proof
blanchet@36402
   851
    fun do_label l = if member (op =) used_ls l then l else no_label
blanchet@36556
   852
    fun do_step (Assume (l, t)) = Assume (do_label l, t)
blanchet@36556
   853
      | do_step (Have (qs, l, t, by)) =
blanchet@36402
   854
        Have (qs, do_label l, t,
blanchet@36402
   855
              case by of
blanchet@36402
   856
                CaseSplit (proofs, facts) =>
blanchet@36556
   857
                CaseSplit (map (map do_step) proofs, facts)
blanchet@36402
   858
              | _ => by)
blanchet@36556
   859
      | do_step step = step
blanchet@36556
   860
  in map do_step proof end
blanchet@36402
   861
blanchet@36402
   862
fun prefix_for_depth n = replicate_string (n + 1)
blanchet@36402
   863
blanchet@36402
   864
val relabel_proof =
blanchet@36402
   865
  let
blanchet@36402
   866
    fun aux _ _ _ [] = []
blanchet@36402
   867
      | aux subst depth (next_assum, next_fact) (Assume (l, t) :: proof) =
blanchet@36402
   868
        if l = no_label then
blanchet@36402
   869
          Assume (l, t) :: aux subst depth (next_assum, next_fact) proof
blanchet@36402
   870
        else
blanchet@36402
   871
          let val l' = (prefix_for_depth depth assum_prefix, next_assum) in
blanchet@36402
   872
            Assume (l', t) ::
blanchet@36402
   873
            aux ((l, l') :: subst) depth (next_assum + 1, next_fact) proof
blanchet@36402
   874
          end
blanchet@36402
   875
      | aux subst depth (next_assum, next_fact) (Have (qs, l, t, by) :: proof) =
blanchet@36402
   876
        let
blanchet@36402
   877
          val (l', subst, next_fact) =
blanchet@36402
   878
            if l = no_label then
blanchet@36402
   879
              (l, subst, next_fact)
blanchet@36402
   880
            else
blanchet@36402
   881
              let
blanchet@42180
   882
                val l' = (prefix_for_depth depth have_prefix, next_fact)
blanchet@36402
   883
              in (l', (l, l') :: subst, next_fact + 1) end
blanchet@36570
   884
          val relabel_facts =
blanchet@39370
   885
            apfst (maps (the_list o AList.lookup (op =) subst))
blanchet@36402
   886
          val by =
blanchet@36402
   887
            case by of
blanchet@36564
   888
              ByMetis facts => ByMetis (relabel_facts facts)
blanchet@36402
   889
            | CaseSplit (proofs, facts) =>
blanchet@36402
   890
              CaseSplit (map (aux subst (depth + 1) (1, 1)) proofs,
blanchet@36402
   891
                         relabel_facts facts)
blanchet@36402
   892
        in
blanchet@36402
   893
          Have (qs, l', t, by) ::
blanchet@36402
   894
          aux subst depth (next_assum, next_fact) proof
blanchet@36402
   895
        end
blanchet@36491
   896
      | aux subst depth nextp (step :: proof) =
blanchet@36491
   897
        step :: aux subst depth nextp proof
blanchet@36402
   898
  in aux [] 0 (1, 1) end
blanchet@36402
   899
blanchet@41136
   900
fun string_for_proof ctxt0 type_sys i n =
blanchet@36402
   901
  let
wenzelm@39134
   902
    val ctxt = ctxt0
wenzelm@39134
   903
      |> Config.put show_free_types false
wenzelm@39134
   904
      |> Config.put show_types true
blanchet@37319
   905
    fun fix_print_mode f x =
wenzelm@39134
   906
      Print_Mode.setmp (filter (curry (op =) Symbol.xsymbolsN)
wenzelm@39134
   907
                               (print_mode_value ())) f x
blanchet@36402
   908
    fun do_indent ind = replicate_string (ind * indent_size) " "
blanchet@36478
   909
    fun do_free (s, T) =
blanchet@36478
   910
      maybe_quote s ^ " :: " ^
blanchet@36478
   911
      maybe_quote (fix_print_mode (Syntax.string_of_typ ctxt) T)
blanchet@36570
   912
    fun do_label l = if l = no_label then "" else string_for_label l ^ ": "
blanchet@36402
   913
    fun do_have qs =
blanchet@36402
   914
      (if member (op =) qs Moreover then "moreover " else "") ^
blanchet@36402
   915
      (if member (op =) qs Ultimately then "ultimately " else "") ^
blanchet@36402
   916
      (if member (op =) qs Then then
blanchet@36402
   917
         if member (op =) qs Show then "thus" else "hence"
blanchet@36402
   918
       else
blanchet@36402
   919
         if member (op =) qs Show then "show" else "have")
blanchet@36478
   920
    val do_term = maybe_quote o fix_print_mode (Syntax.string_of_term ctxt)
blanchet@36570
   921
    fun do_facts (ls, ss) =
blanchet@41136
   922
      metis_command type_sys 1 1
blanchet@38698
   923
                    (ls |> sort_distinct (prod_ord string_ord int_ord),
blanchet@38698
   924
                     ss |> sort_distinct string_ord)
blanchet@36478
   925
    and do_step ind (Fix xs) =
blanchet@36478
   926
        do_indent ind ^ "fix " ^ space_implode " and " (map do_free xs) ^ "\n"
blanchet@36486
   927
      | do_step ind (Let (t1, t2)) =
blanchet@36486
   928
        do_indent ind ^ "let " ^ do_term t1 ^ " = " ^ do_term t2 ^ "\n"
blanchet@36402
   929
      | do_step ind (Assume (l, t)) =
blanchet@36402
   930
        do_indent ind ^ "assume " ^ do_label l ^ do_term t ^ "\n"
blanchet@36564
   931
      | do_step ind (Have (qs, l, t, ByMetis facts)) =
blanchet@36402
   932
        do_indent ind ^ do_have qs ^ " " ^
blanchet@36479
   933
        do_label l ^ do_term t ^ " " ^ do_facts facts ^ "\n"
blanchet@36402
   934
      | do_step ind (Have (qs, l, t, CaseSplit (proofs, facts))) =
blanchet@36402
   935
        space_implode (do_indent ind ^ "moreover\n")
blanchet@36402
   936
                      (map (do_block ind) proofs) ^
blanchet@36479
   937
        do_indent ind ^ do_have qs ^ " " ^ do_label l ^ do_term t ^ " " ^
blanchet@36478
   938
        do_facts facts ^ "\n"
blanchet@36402
   939
    and do_steps prefix suffix ind steps =
blanchet@36402
   940
      let val s = implode (map (do_step ind) steps) in
blanchet@36402
   941
        replicate_string (ind * indent_size - size prefix) " " ^ prefix ^
blanchet@36402
   942
        String.extract (s, ind * indent_size,
blanchet@36402
   943
                        SOME (size s - ind * indent_size - 1)) ^
blanchet@36402
   944
        suffix ^ "\n"
blanchet@36402
   945
      end
blanchet@36402
   946
    and do_block ind proof = do_steps "{ " " }" (ind + 1) proof
blanchet@36564
   947
    (* One-step proofs are pointless; better use the Metis one-liner
blanchet@36564
   948
       directly. *)
blanchet@36564
   949
    and do_proof [Have (_, _, _, ByMetis _)] = ""
blanchet@36564
   950
      | do_proof proof =
blanchet@36480
   951
        (if i <> 1 then "prefer " ^ string_of_int i ^ "\n" else "") ^
blanchet@39452
   952
        do_indent 0 ^ "proof -\n" ^ do_steps "" "" 1 proof ^ do_indent 0 ^
blanchet@39452
   953
        (if n <> 1 then "next" else "qed")
blanchet@36488
   954
  in do_proof end
blanchet@36402
   955
blanchet@37479
   956
fun isar_proof_text (pool, debug, isar_shrink_factor, ctxt, conjecture_shape)
blanchet@42541
   957
        (metis_params as (_, type_sys, _, atp_proof, facts_offset, fact_names,
blanchet@42541
   958
                          goal, i)) =
blanchet@36402
   959
  let
blanchet@36909
   960
    val (params, hyp_ts, concl_t) = strip_subgoal goal i
blanchet@36909
   961
    val frees = fold Term.add_frees (concl_t :: hyp_ts) []
blanchet@36967
   962
    val tfrees = fold Term.add_tfrees (concl_t :: hyp_ts) []
blanchet@36402
   963
    val n = Logic.count_prems (prop_of goal)
blanchet@40723
   964
    val (one_line_proof, lemma_names) = metis_proof_text metis_params
blanchet@36283
   965
    fun isar_proof_for () =
blanchet@42449
   966
      case isar_proof_from_atp_proof pool ctxt type_sys tfrees
blanchet@42541
   967
               isar_shrink_factor atp_proof conjecture_shape facts_offset
blanchet@42541
   968
               fact_names params frees
blanchet@39372
   969
           |> redirect_proof hyp_ts concl_t
blanchet@36402
   970
           |> kill_duplicate_assumptions_in_proof
blanchet@36402
   971
           |> then_chain_proof
blanchet@36402
   972
           |> kill_useless_labels_in_proof
blanchet@36402
   973
           |> relabel_proof
blanchet@41136
   974
           |> string_for_proof ctxt type_sys i n of
blanchet@42554
   975
        "" => "\nNo structured proof available (proof too short)."
blanchet@38599
   976
      | proof => "\n\nStructured proof:\n" ^ Markup.markup Markup.sendback proof
blanchet@35868
   977
    val isar_proof =
blanchet@36402
   978
      if debug then
blanchet@36283
   979
        isar_proof_for ()
blanchet@36283
   980
      else
blanchet@36283
   981
        try isar_proof_for ()
blanchet@38599
   982
        |> the_default "\nWarning: The Isar proof construction failed."
blanchet@36283
   983
  in (one_line_proof ^ isar_proof, lemma_names) end
paulson@21978
   984
blanchet@40723
   985
fun proof_text isar_proof isar_params metis_params =
blanchet@36557
   986
  (if isar_proof then isar_proof_text isar_params else metis_proof_text)
blanchet@40723
   987
      metis_params
blanchet@36223
   988
immler@31038
   989
end;