(*  Title:      Pure/Isar/proof_context.ML

    ID:         $Id$

    Author:     Markus Wenzel, TU Muenchen

The key concept of Isar proof contexts: elevates primitive local

reasoning Gamma |- phi to a structured concept, with generic context

elements.  See also structure Variable and Assumption.

*)

signature PROOF_CONTEXT =

sig

  val theory_of: Proof.context -> theory

  val init: theory -> Proof.context

  type mode

  val mode_default: mode

  val mode_stmt: mode

  val mode_pattern: mode

  val mode_schematic: mode

  val mode_abbrev: mode

  val set_mode: mode -> Proof.context -> Proof.context

  val get_mode: Proof.context -> mode

  val restore_mode: Proof.context -> Proof.context -> Proof.context

  val abbrev_mode: Proof.context -> bool

  val set_stmt: bool -> Proof.context -> Proof.context

  val naming_of: Proof.context -> NameSpace.naming

  val full_name: Proof.context -> Binding.T -> string

  val full_bname: Proof.context -> bstring -> string

  val consts_of: Proof.context -> Consts.T

  val const_syntax_name: Proof.context -> string -> string

  val the_const_constraint: Proof.context -> string -> typ

  val mk_const: Proof.context -> string * typ list -> term

  val set_syntax_mode: Syntax.mode -> Proof.context -> Proof.context

  val restore_syntax_mode: Proof.context -> Proof.context -> Proof.context

  val facts_of: Proof.context -> Facts.T

  val transfer_syntax: theory -> Proof.context -> Proof.context

  val transfer: theory -> Proof.context -> Proof.context

  val theory: (theory -> theory) -> Proof.context -> Proof.context

  val theory_result: (theory -> 'a * theory) -> Proof.context -> 'a * Proof.context

  val extern_fact: Proof.context -> string -> xstring

  val pretty_term_abbrev: Proof.context -> term -> Pretty.T

  val pretty_thm_legacy: thm -> Pretty.T

  val pretty_thm: Proof.context -> thm -> Pretty.T

  val pretty_thms: Proof.context -> thm list -> Pretty.T

  val pretty_fact: Proof.context -> string * thm list -> Pretty.T

  val string_of_thm: Proof.context -> thm -> string

  val read_typ: Proof.context -> string -> typ

  val read_typ_syntax: Proof.context -> string -> typ

  val read_typ_abbrev: Proof.context -> string -> typ

  val cert_typ: Proof.context -> typ -> typ

  val cert_typ_syntax: Proof.context -> typ -> typ

  val cert_typ_abbrev: Proof.context -> typ -> typ

  val get_skolem: Proof.context -> string -> string

  val revert_skolem: Proof.context -> string -> string

  val infer_type: Proof.context -> string -> typ

  val inferred_param: string -> Proof.context -> typ * Proof.context

  val inferred_fixes: Proof.context -> (string * typ) list * Proof.context

  val read_tyname: Proof.context -> string -> typ

  val read_const_proper: Proof.context -> string -> term

  val read_const: Proof.context -> string -> term

  val allow_dummies: Proof.context -> Proof.context

  val decode_term: Proof.context -> term -> term

  val standard_infer_types: Proof.context -> term list -> term list

  val read_term_pattern: Proof.context -> string -> term

  val read_term_schematic: Proof.context -> string -> term

  val read_term_abbrev: Proof.context -> string -> term

  val expand_abbrevs: Proof.context -> term -> term

  val cert_term: Proof.context -> term -> term

  val cert_prop: Proof.context -> term -> term

  val goal_export: Proof.context -> Proof.context -> thm list -> thm list

  val export: Proof.context -> Proof.context -> thm list -> thm list

  val export_morphism: Proof.context -> Proof.context -> morphism

  val norm_export_morphism: Proof.context -> Proof.context -> morphism

  val add_binds: (indexname * string option) list -> Proof.context -> Proof.context

  val add_binds_i: (indexname * term option) list -> Proof.context -> Proof.context

  val auto_bind_goal: term list -> Proof.context -> Proof.context

  val auto_bind_facts: term list -> Proof.context -> Proof.context

  val match_bind: bool -> (string list * string) list -> Proof.context -> term list * Proof.context

  val match_bind_i: bool -> (term list * term) list -> Proof.context -> term list * Proof.context

  val read_propp: Proof.context * (string * string list) list list

    -> Proof.context * (term * term list) list list

  val cert_propp: Proof.context * (term * term list) list list

    -> Proof.context * (term * term list) list list

  val read_propp_schematic: Proof.context * (string * string list) list list

    -> Proof.context * (term * term list) list list

  val cert_propp_schematic: Proof.context * (term * term list) list list

    -> Proof.context * (term * term list) list list

  val bind_propp: Proof.context * (string * string list) list list

    -> Proof.context * (term list list * (Proof.context -> Proof.context))

  val bind_propp_i: Proof.context * (term * term list) list list

    -> Proof.context * (term list list * (Proof.context -> Proof.context))

  val bind_propp_schematic: Proof.context * (string * string list) list list

    -> Proof.context * (term list list * (Proof.context -> Proof.context))

  val bind_propp_schematic_i: Proof.context * (term * term list) list list

    -> Proof.context * (term list list * (Proof.context -> Proof.context))

  val fact_tac: thm list -> int -> tactic

  val some_fact_tac: Proof.context -> int -> tactic

  val get_fact: Proof.context -> Facts.ref -> thm list

  val get_fact_single: Proof.context -> Facts.ref -> thm

  val get_thms: Proof.context -> xstring -> thm list

  val get_thm: Proof.context -> xstring -> thm

  val add_path: string -> Proof.context -> Proof.context

  val no_base_names: Proof.context -> Proof.context

  val qualified_names: Proof.context -> Proof.context

  val sticky_prefix: string -> Proof.context -> Proof.context

  val restore_naming: Proof.context -> Proof.context -> Proof.context

  val reset_naming: Proof.context -> Proof.context

  val note_thmss: string ->

    ((Binding.T * attribute list) * (Facts.ref * attribute list) list) list ->

      Proof.context -> (string * thm list) list * Proof.context

  val note_thmss_i: string ->

    ((Binding.T * attribute list) * (thm list * attribute list) list) list ->

      Proof.context -> (string * thm list) list * Proof.context

  val put_thms: bool -> string * thm list option -> Proof.context -> Proof.context

  val read_vars: (Binding.T * string option * mixfix) list -> Proof.context ->

    (Binding.T * typ option * mixfix) list * Proof.context

  val cert_vars: (Binding.T * typ option * mixfix) list -> Proof.context ->

    (Binding.T * typ option * mixfix) list * Proof.context

  val add_fixes: (Binding.T * string option * mixfix) list ->

    Proof.context -> string list * Proof.context

  val add_fixes_i: (Binding.T * typ option * mixfix) list ->

    Proof.context -> string list * Proof.context

  val auto_fixes: Proof.context * (term list list * 'a) -> Proof.context * (term list list * 'a)

  val bind_fixes: string list -> Proof.context -> (term -> term) * Proof.context

  val add_assms: Assumption.export ->

    ((Binding.T * attribute list) * (string * string list) list) list ->

    Proof.context -> (string * thm list) list * Proof.context

  val add_assms_i: Assumption.export ->

    ((Binding.T * attribute list) * (term * term list) list) list ->

    Proof.context -> (string * thm list) list * Proof.context

  val add_cases: bool -> (string * RuleCases.T option) list -> Proof.context -> Proof.context

  val apply_case: RuleCases.T -> Proof.context -> (string * term list) list * Proof.context

  val get_case: Proof.context -> string -> string option list -> RuleCases.T

  val notation: bool -> Syntax.mode -> (term * mixfix) list -> Proof.context -> Proof.context

  val target_notation: bool -> Syntax.mode -> (term * mixfix) list -> morphism ->

    Context.generic -> Context.generic

  val add_const_constraint: string * typ option -> Proof.context -> Proof.context

  val add_abbrev: string -> Properties.T ->

    Binding.T * term -> Proof.context -> (term * term) * Proof.context

  val revert_abbrev: string -> string -> Proof.context -> Proof.context

  val verbose: bool ref

  val setmp_verbose: ('a -> 'b) -> 'a -> 'b

  val print_syntax: Proof.context -> unit

  val print_abbrevs: Proof.context -> unit

  val print_binds: Proof.context -> unit

  val print_lthms: Proof.context -> unit

  val print_cases: Proof.context -> unit

  val debug: bool ref

  val prems_limit: int ref

  val pretty_ctxt: Proof.context -> Pretty.T list

  val pretty_context: Proof.context -> Pretty.T list

  val query_type: Proof.context -> string -> Properties.T

  val query_const: Proof.context -> string -> Properties.T

  val query_class: Proof.context -> string -> Properties.T

end;

structure ProofContext: PROOF_CONTEXT =

struct

val theory_of = Context.theory_of_proof;

val init = Context.init_proof;

(** inner syntax mode **)

datatype mode =

  Mode of

   {stmt: bool,                (*inner statement mode*)

    pattern: bool,             (*pattern binding schematic variables*)

    schematic: bool,           (*term referencing loose schematic variables*)

    abbrev: bool};             (*abbrev mode -- no normalization*)

fun make_mode (stmt, pattern, schematic, abbrev) =

  Mode {stmt = stmt, pattern = pattern, schematic = schematic, abbrev = abbrev};

val mode_default   = make_mode (false, false, false, false);

val mode_stmt      = make_mode (true, false, false, false);

val mode_pattern   = make_mode (false, true, false, false);

val mode_schematic = make_mode (false, false, true, false);

val mode_abbrev    = make_mode (false, false, false, true);

(** Isar proof context information **)

datatype ctxt =

  Ctxt of

   {mode: mode,                                       (*inner syntax mode*)

    naming: NameSpace.naming,                         (*local naming conventions*)

    syntax: LocalSyntax.T,                            (*local syntax*)

    consts: Consts.T * Consts.T,                      (*local/global consts*)

    facts: Facts.T,                                   (*local facts*)

    cases: (string * (RuleCases.T * bool)) list};     (*named case contexts*)

fun make_ctxt (mode, naming, syntax, consts, facts, cases) =

  Ctxt {mode = mode, naming = naming, syntax = syntax,

    consts = consts, facts = facts, cases = cases};

val local_naming = NameSpace.default_naming |> NameSpace.add_path "local";

structure ContextData = ProofDataFun

(

  type T = ctxt;

  fun init thy =

    make_ctxt (mode_default, local_naming, LocalSyntax.init thy,

      (Sign.consts_of thy, Sign.consts_of thy), Facts.empty, []);

);

fun rep_context ctxt = ContextData.get ctxt |> (fn Ctxt args => args);

fun map_context f =

  ContextData.map (fn Ctxt {mode, naming, syntax, consts, facts, cases} =>

    make_ctxt (f (mode, naming, syntax, consts, facts, cases)));

fun set_mode mode = map_context (fn (_, naming, syntax, consts, facts, cases) =>

  (mode, naming, syntax, consts, facts, cases));

fun map_mode f =

  map_context (fn (Mode {stmt, pattern, schematic, abbrev}, naming, syntax, consts, facts, cases) =>

    (make_mode (f (stmt, pattern, schematic, abbrev)), naming, syntax, consts, facts, cases));

fun map_naming f =

  map_context (fn (mode, naming, syntax, consts, facts, cases) =>

    (mode, f naming, syntax, consts, facts, cases));

fun map_syntax f =

  map_context (fn (mode, naming, syntax, consts, facts, cases) =>

    (mode, naming, f syntax, consts, facts, cases));

fun map_consts f =

  map_context (fn (mode, naming, syntax, consts, facts, cases) =>

    (mode, naming, syntax, f consts, facts, cases));

fun map_facts f =

  map_context (fn (mode, naming, syntax, consts, facts, cases) =>

    (mode, naming, syntax, consts, f facts, cases));

fun map_cases f =

  map_context (fn (mode, naming, syntax, consts, facts, cases) =>

    (mode, naming, syntax, consts, facts, f cases));

val get_mode = #mode o rep_context;

val restore_mode = set_mode o get_mode;

val abbrev_mode = get_mode #> (fn Mode {abbrev, ...} => abbrev);

fun set_stmt stmt =

  map_mode (fn (_, pattern, schematic, abbrev) => (stmt, pattern, schematic, abbrev));

val naming_of = #naming o rep_context;

val full_name = NameSpace.full_name o naming_of;

fun full_bname thy = NameSpace.full_name (naming_of thy) o Binding.name;

val syntax_of = #syntax o rep_context;

val syn_of = LocalSyntax.syn_of o syntax_of;

val set_syntax_mode = map_syntax o LocalSyntax.set_mode;

val restore_syntax_mode = map_syntax o LocalSyntax.restore_mode o syntax_of;

val consts_of = #1 o #consts o rep_context;

val const_syntax_name = Consts.syntax_name o consts_of;

val the_const_constraint = Consts.the_constraint o consts_of;

fun mk_const ctxt (c, Ts) = Const (c, Consts.instance (consts_of ctxt) (c, Ts));

val facts_of = #facts o rep_context;

val cases_of = #cases o rep_context;

(* theory transfer *)

fun transfer_syntax thy =

  map_syntax (LocalSyntax.rebuild thy) #>

  map_consts (fn consts as (local_consts, global_consts) =>

    let val thy_consts = Sign.consts_of thy in

      if Consts.eq_consts (thy_consts, global_consts) then consts

      else (Consts.merge (local_consts, thy_consts), thy_consts)

    end);

fun transfer thy = Context.transfer_proof thy #> transfer_syntax thy;

fun theory f ctxt = transfer (f (theory_of ctxt)) ctxt;

fun theory_result f ctxt =

  let val (res, thy') = f (theory_of ctxt)

  in (res, ctxt |> transfer thy') end;

(** pretty printing **)

(* extern *)

fun extern_fact ctxt name =

  let

    val local_facts = facts_of ctxt;

    val global_facts = PureThy.facts_of (theory_of ctxt);

  in

    if is_some (Facts.lookup (Context.Proof ctxt) local_facts name)

    then Facts.extern local_facts name

    else Facts.extern global_facts name

  end;

(* pretty *)

fun pretty_term_abbrev ctxt = Syntax.pretty_term (set_mode mode_abbrev ctxt);

fun pretty_thm_legacy th =

  let val thy = Thm.theory_of_thm th

  in Display.pretty_thm_aux (Syntax.pp_global thy) true false [] th end;

fun pretty_thm ctxt th =

  let val asms = map Thm.term_of (Assumption.assms_of ctxt)

  in Display.pretty_thm_aux (Syntax.pp ctxt) false true asms th end;

fun pretty_thms ctxt [th] = pretty_thm ctxt th

  | pretty_thms ctxt ths = Pretty.blk (0, Pretty.fbreaks (map (pretty_thm ctxt) ths));

fun pretty_fact_name ctxt a = Pretty.block

  [Pretty.markup (Markup.fact a) [Pretty.str (extern_fact ctxt a)], Pretty.str ":"];

fun pretty_fact ctxt ("", ths) = pretty_thms ctxt ths

  | pretty_fact ctxt (a, [th]) = Pretty.block

      [pretty_fact_name ctxt a, Pretty.brk 1, pretty_thm ctxt th]

  | pretty_fact ctxt (a, ths) = Pretty.block

      (Pretty.fbreaks (pretty_fact_name ctxt a :: map (pretty_thm ctxt) ths));

val string_of_thm = Pretty.string_of oo pretty_thm;

(** prepare types **)

(* read_typ *)

fun read_typ_mode mode ctxt s =

  Syntax.read_typ (Type.set_mode mode ctxt) s;

val read_typ        = read_typ_mode Type.mode_default;

val read_typ_syntax = read_typ_mode Type.mode_syntax;

val read_typ_abbrev = read_typ_mode Type.mode_abbrev;

(* cert_typ *)

fun cert_typ_mode mode ctxt T =

  Sign.certify_typ_mode mode (theory_of ctxt) T

    handle TYPE (msg, _, _) => error msg;

val cert_typ        = cert_typ_mode Type.mode_default;

val cert_typ_syntax = cert_typ_mode Type.mode_syntax;

val cert_typ_abbrev = cert_typ_mode Type.mode_abbrev;

(** prepare variables **)

(* internalize Skolem constants *)

val lookup_skolem = AList.lookup (op =) o Variable.fixes_of;

fun get_skolem ctxt x = the_default x (lookup_skolem ctxt x);

fun no_skolem internal x =

  if can Name.dest_skolem x then

    error ("Illegal reference to internal Skolem constant: " ^ quote x)

  else if not internal andalso can Name.dest_internal x then

    error ("Illegal reference to internal variable: " ^ quote x)

  else x;

(* revert Skolem constants -- if possible *)

fun revert_skolem ctxt x =

  (case find_first (fn (_, y) => y = x) (Variable.fixes_of ctxt) of

    SOME (x', _) => if lookup_skolem ctxt x' = SOME x then x' else x

  | NONE => x);

(* default token translations *)

local

fun free_or_skolem ctxt x =

  (if can Name.dest_skolem x then Pretty.mark Markup.skolem (Pretty.str (revert_skolem ctxt x))

   else Pretty.mark Markup.free (Pretty.str x))

  |> Pretty.mark

    (if Variable.is_fixed ctxt x orelse Syntax.is_pretty_global ctxt then Markup.fixed x

     else Markup.hilite);

fun var_or_skolem _ s =

  (case Lexicon.read_variable s of

    SOME (x, i) =>

      (case try Name.dest_skolem x of

        NONE => Pretty.mark Markup.var (Pretty.str s)

      | SOME x' => Pretty.mark Markup.skolem

          (Pretty.str (setmp show_question_marks true Term.string_of_vname (x', i))))

  | NONE => Pretty.mark Markup.var (Pretty.str s));

fun class_markup _ c =    (* FIXME authentic name *)

  Pretty.mark (Markup.tclassN, []) (Pretty.str c);

fun plain_markup m _ s = Pretty.mark m (Pretty.str s);

val token_trans =

 Syntax.tokentrans_mode ""

  [("class", class_markup),

   ("tfree", plain_markup Markup.tfree),

   ("tvar", plain_markup Markup.tvar),

   ("free", free_or_skolem),

   ("bound", plain_markup Markup.bound),

   ("var", var_or_skolem),

   ("num", plain_markup Markup.num),

   ("xnum", plain_markup Markup.xnum),

   ("xstr", plain_markup Markup.xstr)];

in val _ = Context.>> (Context.map_theory (Sign.add_tokentrfuns token_trans)) end;

(** prepare terms and propositions **)

(* inferred types of parameters *)

fun infer_type ctxt x =

  Term.fastype_of (singleton (Syntax.check_terms (set_mode mode_schematic ctxt))

    (Free (x, dummyT)));

fun inferred_param x ctxt =

  let val T = infer_type ctxt x

  in (T, ctxt |> Variable.declare_term (Free (x, T))) end;

fun inferred_fixes ctxt =

  let

    val xs = rev (map #2 (Variable.fixes_of ctxt));

    val (Ts, ctxt') = fold_map inferred_param xs ctxt;

  in (xs ~~ Ts, ctxt') end;

(* type and constant names *)

local

val token_content = Syntax.read_token #>> SymbolPos.content;

fun prep_const_proper ctxt (c, pos) =

  let val t as (Const (d, _)) =

    (case Variable.lookup_const ctxt c of

      SOME d => Const (d, Consts.type_scheme (consts_of ctxt) d handle TYPE (msg, _, _) => error msg)

    | NONE => Consts.read_const (consts_of ctxt) c)

  in Position.report (Markup.const d) pos; t end;

in

fun read_tyname ctxt str =

  let

    val thy = theory_of ctxt;

    val (c, pos) = token_content str;

  in

    if Syntax.is_tid c then

     (Position.report Markup.tfree pos;

      TFree (c, the_default (Sign.defaultS thy) (Variable.def_sort ctxt (c, ~1))))

    else

      let

        val d = Sign.intern_type thy c;

        val _ = Position.report (Markup.tycon d) pos;

      in Type (d, replicate (Sign.arity_number thy d) dummyT) end

  end;

fun read_const_proper ctxt = prep_const_proper ctxt o token_content;

fun read_const ctxt str =

  let val (c, pos) = token_content str in

    (case (lookup_skolem ctxt c, Variable.is_const ctxt c) of

      (SOME x, false) =>

        (Position.report (Markup.name x

            (if can Name.dest_skolem x then Markup.skolem else Markup.free)) pos;

          Free (x, infer_type ctxt x))

    | _ => prep_const_proper ctxt (c, pos))

  end;

end;

(* read_term *)

fun read_term_mode mode ctxt = Syntax.read_term (set_mode mode ctxt);

val read_term_pattern   = read_term_mode mode_pattern;

val read_term_schematic = read_term_mode mode_schematic;

val read_term_abbrev    = read_term_mode mode_abbrev;

(* local abbreviations *)

val tsig_of = Sign.tsig_of o ProofContext.theory_of;

local

fun certify_consts ctxt = Consts.certify (Syntax.pp ctxt) (tsig_of ctxt)

  (not (abbrev_mode ctxt)) (consts_of ctxt);

fun reject_schematic (Var (xi, _)) =

      error ("Unbound schematic variable: " ^ Term.string_of_vname xi)

  | reject_schematic (Abs (_, _, t)) = reject_schematic t

  | reject_schematic (t $ u) = (reject_schematic t; reject_schematic u)

  | reject_schematic _ = ();

fun expand_binds ctxt =

  let val Mode {pattern, schematic, ...} = get_mode ctxt in

    if pattern then I

    else Variable.expand_binds ctxt #> (if schematic then I else tap reject_schematic)

  end;

in

fun expand_abbrevs ctxt = certify_consts ctxt #> expand_binds ctxt;

end;

fun contract_abbrevs ctxt t =

  let

    val thy = theory_of ctxt;

    val consts = consts_of ctxt;

    val Mode {abbrev, ...} = get_mode ctxt;

  in

    if abbrev orelse print_mode_active "no_abbrevs" orelse not (can Term.type_of t) then t

    else t |> Pattern.rewrite_term thy (Consts.abbrevs_of consts (print_mode_value () @ [""])) []

  end;

(* patterns *)

fun prepare_patternT ctxt =

  let val Mode {pattern, schematic, ...} = get_mode ctxt in

    if pattern orelse schematic then I

    else Term.map_atyps

      (fn T as TVar (xi, _) =>

            if not (TypeInfer.is_param xi)

            then error ("Illegal schematic type variable: " ^ Term.string_of_vname xi)

            else T

        | T => T)

  end;

local

structure AllowDummies = ProofDataFun(type T = bool fun init _ = false);

fun check_dummies ctxt t =

  if AllowDummies.get ctxt then t

  else Term.no_dummy_patterns t handle TERM _ => error "Illegal dummy pattern(s) in term";

fun prepare_dummies ts = #1 (fold_map Term.replace_dummy_patterns ts 1);

in

val allow_dummies = AllowDummies.put true;

fun prepare_patterns ctxt =

  let val Mode {pattern, ...} = get_mode ctxt in

    TypeInfer.fixate_params (Variable.names_of ctxt) #>

    pattern ? Variable.polymorphic ctxt #>

    (map o Term.map_types) (prepare_patternT ctxt) #>

    (if pattern then prepare_dummies else map (check_dummies ctxt))

  end;

end;

(* decoding raw terms (syntax trees) *)

(* types *)

fun get_sort thy def_sort raw_env =

  let

    val tsig = Sign.tsig_of thy;

    fun eq ((xi, S), (xi', S')) =

      Term.eq_ix (xi, xi') andalso Type.eq_sort tsig (S, S');

    val env = distinct eq raw_env;

    val _ = (case duplicates (eq_fst (op =)) env of [] => ()

      | dups => error ("Inconsistent sort constraints for type variable(s) "

          ^ commas_quote (map (Term.string_of_vname' o fst) dups)));

    fun get xi =

      (case (AList.lookup (op =) env xi, def_sort xi) of

        (NONE, NONE) => Type.defaultS tsig

      | (NONE, SOME S) => S

      | (SOME S, NONE) => S

      | (SOME S, SOME S') =>

          if Type.eq_sort tsig (S, S') then S'

          else error ("Sort constraint inconsistent with default for type variable " ^

            quote (Term.string_of_vname' xi)));

  in get end;

local

fun intern_skolem ctxt def_type x =

  let

    val _ = no_skolem false x;

    val sko = lookup_skolem ctxt x;

    val is_const = can (read_const_proper ctxt) x orelse NameSpace.is_qualified x;

    val is_declared = is_some (def_type (x, ~1));

  in

    if Variable.is_const ctxt x then NONE

    else if is_some sko then sko

    else if not is_const orelse is_declared then SOME x

    else NONE

  end;

in

fun term_context ctxt =

  let val thy = theory_of ctxt in

   {get_sort = get_sort thy (Variable.def_sort ctxt),

    map_const = fn a => ((true, #1 (Term.dest_Const (read_const_proper ctxt a)))

      handle ERROR _ => (false, Consts.intern (consts_of ctxt) a)),

    map_free = intern_skolem ctxt (Variable.def_type ctxt false),

    map_type = Sign.intern_tycons thy,

    map_sort = Sign.intern_sort thy}

  end;

fun decode_term ctxt =

  let val {get_sort, map_const, map_free, map_type, map_sort} = term_context ctxt

  in Syntax.decode_term get_sort map_const map_free map_type map_sort end;

end;

(* certify terms *)

local

fun gen_cert prop ctxt t =

  t

  |> expand_abbrevs ctxt

  |> (fn t' => #1 (Sign.certify' prop (Syntax.pp ctxt) false (consts_of ctxt) (theory_of ctxt) t')

    handle TYPE (msg, _, _) => error msg

      | TERM (msg, _) => error msg);

in

val cert_term = gen_cert false;

val cert_prop = gen_cert true;

end;

(* type checking/inference *)

fun standard_infer_types ctxt ts =

  let val Mode {pattern, ...} = get_mode ctxt in

    TypeInfer.infer_types (Syntax.pp ctxt) (tsig_of ctxt) (Syntax.check_typs ctxt)

      (try (Consts.the_constraint (consts_of ctxt))) (Variable.def_type ctxt pattern)

      (Variable.names_of ctxt) (Variable.maxidx_of ctxt) ts

    handle TYPE (msg, _, _) => error msg

  end;

local

fun standard_typ_check ctxt =

  map (cert_typ_mode (Type.get_mode ctxt) ctxt) #>

  map (prepare_patternT ctxt);

fun standard_term_check ctxt =

  standard_infer_types ctxt #>

  map (expand_abbrevs ctxt);

fun standard_term_uncheck ctxt =

  map (contract_abbrevs ctxt);

fun add eq what f = Context.>> (what (fn xs => fn ctxt =>

  let val xs' = f ctxt xs in if eq_list eq (xs, xs') then NONE else SOME (xs', ctxt) end));

in

val _ = add (op =) (Syntax.add_typ_check 0 "standard") standard_typ_check;

val _ = add (op aconv) (Syntax.add_term_check 0 "standard") standard_term_check;

val _ = add (op aconv) (Syntax.add_term_check 100 "fixate") prepare_patterns;

val _ = add (op aconv) (Syntax.add_term_uncheck 0 "standard") standard_term_uncheck;

end;

(** inner syntax operations **)

local

fun parse_sort ctxt text =

  let

    val (syms, pos) = Syntax.parse_token Markup.sort text;

    val S = Syntax.standard_parse_sort ctxt (syn_of ctxt)

        (Sign.intern_sort (theory_of ctxt)) (syms, pos)

      handle ERROR msg => cat_error msg  ("Failed to parse sort" ^ Position.str_of pos)

  in S end;

fun parse_typ ctxt text =

  let

    val thy = ProofContext.theory_of ctxt;

    val get_sort = get_sort thy (Variable.def_sort ctxt);

    val (syms, pos) = Syntax.parse_token Markup.typ text;

    val T = Sign.intern_tycons thy

        (Syntax.standard_parse_typ ctxt (syn_of ctxt) get_sort (Sign.intern_sort thy) (syms, pos))

      handle ERROR msg => cat_error msg  ("Failed to parse type" ^ Position.str_of pos);

  in T end;

fun parse_term T ctxt text =

  let

    val thy = theory_of ctxt;

    val {get_sort, map_const, map_free, map_type, map_sort} = term_context ctxt;

    val (T', _) = TypeInfer.paramify_dummies T 0;

    val (markup, kind) = if T' = propT then (Markup.prop, "proposition") else (Markup.term, "term");

    val (syms, pos) = Syntax.parse_token markup text;

    fun check t = (Syntax.check_term ctxt (TypeInfer.constrain T' t); NONE)

      handle ERROR msg => SOME msg;

    val t = Syntax.standard_parse_term (Syntax.pp ctxt) check get_sort map_const map_free

        map_type map_sort ctxt (Sign.is_logtype thy) (syn_of ctxt) T' (syms, pos)

      handle ERROR msg => cat_error msg  ("Failed to parse " ^ kind ^ Position.str_of pos);

  in t end;

fun unparse_sort ctxt S =

  Syntax.standard_unparse_sort ctxt (syn_of ctxt) (Sign.extern_sort (theory_of ctxt) S);

fun unparse_typ ctxt T =

  Syntax.standard_unparse_typ ctxt (syn_of ctxt) (Sign.extern_typ (theory_of ctxt) T);

fun unparse_term ctxt t =

  let

    val thy = theory_of ctxt;

    val syntax = syntax_of ctxt;

    val consts = consts_of ctxt;

  in

    t

    |> Sign.extern_term (Consts.extern_early consts) thy

    |> LocalSyntax.extern_term syntax

    |> Syntax.standard_unparse_term (Consts.extern consts) ctxt (LocalSyntax.syn_of syntax)

        (not (PureThy.old_appl_syntax thy))

  end;

in

val _ = Syntax.install_operations

  {parse_sort = parse_sort,

   parse_typ = parse_typ,

   parse_term = parse_term dummyT,

   parse_prop = parse_term propT,

   unparse_sort = unparse_sort,

   unparse_typ = unparse_typ,

   unparse_term = unparse_term};

end;

(** export results **)

fun common_export is_goal inner outer =

  map (Assumption.export is_goal inner outer) #>

  Variable.export inner outer;

val goal_export = common_export true;

val export = common_export false;

fun export_morphism inner outer =

  Assumption.export_morphism inner outer $>

  Variable.export_morphism inner outer;

fun norm_export_morphism inner outer =

  export_morphism inner outer $>

  Morphism.thm_morphism Goal.norm_result;

(** bindings **)

(* simult_matches *)

fun simult_matches ctxt (t, pats) =

  (case Seq.pull (Unify.matchers (theory_of ctxt) (map (rpair t) pats)) of

    NONE => error "Pattern match failed!"

  | SOME (env, _) => map (apsnd snd) (Envir.alist_of env));

(* add_binds(_i) *)

local

fun gen_bind prep (xi as (x, _), raw_t) ctxt =

  ctxt

  |> Variable.add_binds [(xi, Option.map (prep (set_mode mode_default ctxt)) raw_t)];

in

fun drop_schematic (b as (xi, SOME t)) = if Term.exists_subterm is_Var t then (xi, NONE) else b

  | drop_schematic b = b;

val add_binds = fold (gen_bind Syntax.read_term);

val add_binds_i = fold (gen_bind cert_term);

fun auto_bind f ts ctxt = ctxt |> add_binds_i (map drop_schematic (f (theory_of ctxt) ts));

val auto_bind_goal = auto_bind AutoBind.goal;

val auto_bind_facts = auto_bind AutoBind.facts;

end;

(* match_bind(_i) *)

local

fun gen_bind prep_terms gen raw_binds ctxt =

  let

    fun prep_bind (raw_pats, t) ctxt1 =

      let

        val T = Term.fastype_of t;

        val ctxt2 = Variable.declare_term t ctxt1;

        val pats = prep_terms (set_mode mode_pattern ctxt2) T raw_pats;

        val binds = simult_matches ctxt2 (t, pats);

      in (binds, ctxt2) end;

    val ts = prep_terms ctxt dummyT (map snd raw_binds);

    val (binds, ctxt') = apfst flat (fold_map prep_bind (map fst raw_binds ~~ ts) ctxt);

    val binds' =

      if gen then map #1 binds ~~ Variable.exportT_terms ctxt' ctxt (map #2 binds)

      else binds;

    val binds'' = map (apsnd SOME) binds';

    val ctxt'' =

      tap (Variable.warn_extra_tfrees ctxt)

       (if gen then

          ctxt (*sic!*) |> fold Variable.declare_term (map #2 binds') |> add_binds_i binds''

        else ctxt' |> add_binds_i binds'');

  in (ts, ctxt'') end;

in

fun read_terms ctxt T =

  map (Syntax.parse_term ctxt #> TypeInfer.constrain T) #> Syntax.check_terms ctxt;

val match_bind = gen_bind read_terms;

val match_bind_i = gen_bind (fn ctxt => fn _ => map (cert_term ctxt));

end;

(* propositions with patterns *)

local

fun prep_propp mode prep_props (context, args) =

  let

    fun prep (_, raw_pats) (ctxt, prop :: props) =

      let val ctxt' = Variable.declare_term prop ctxt

      in ((prop, prep_props (set_mode mode_pattern ctxt') raw_pats), (ctxt', props)) end;

    val (propp, (context', _)) = (fold_map o fold_map) prep args

      (context, prep_props (set_mode mode context) (maps (map fst) args));

  in (context', propp) end;

fun gen_bind_propp mode parse_prop (ctxt, raw_args) =

  let

    val (ctxt', args) = prep_propp mode parse_prop (ctxt, raw_args);

    val binds = flat (flat (map (map (simult_matches ctxt')) args));

    val propss = map (map #1) args;

    (*generalize result: context evaluated now, binds added later*)

    val gen = Variable.exportT_terms ctxt' ctxt;

    fun gen_binds c = c |> add_binds_i (map #1 binds ~~ map SOME (gen (map #2 binds)));

  in (ctxt' |> add_binds_i (map (apsnd SOME) binds), (propss, gen_binds)) end;

in

val read_propp           = prep_propp mode_default Syntax.read_props;

val cert_propp           = prep_propp mode_default (map o cert_prop);

val read_propp_schematic = prep_propp mode_schematic Syntax.read_props;

val cert_propp_schematic = prep_propp mode_schematic (map o cert_prop);

val bind_propp             = gen_bind_propp mode_default Syntax.read_props;

val bind_propp_i           = gen_bind_propp mode_default (map o cert_prop);

val bind_propp_schematic   = gen_bind_propp mode_schematic Syntax.read_props;

val bind_propp_schematic_i = gen_bind_propp mode_schematic (map o cert_prop);

end;

(** theorems **)

(* fact_tac *)

fun comp_incr_tac [] _ = no_tac

  | comp_incr_tac (th :: ths) i =

      (fn st => Goal.compose_hhf_tac (Drule.incr_indexes st th) i st) APPEND comp_incr_tac ths i;

fun fact_tac facts = Goal.norm_hhf_tac THEN' comp_incr_tac facts;

fun potential_facts ctxt prop =

  Facts.could_unify (facts_of ctxt) (Term.strip_all_body prop);

fun some_fact_tac ctxt = SUBGOAL (fn (goal, i) => fact_tac (potential_facts ctxt goal) i);

(* get_thm(s) *)

local

fun retrieve_thms pick ctxt (Facts.Fact s) =

      let

        val (_, pos) = Syntax.read_token s;

        val prop = Syntax.read_prop (set_mode mode_default ctxt) s

          |> singleton (Variable.polymorphic ctxt);

        fun prove_fact th =

          Goal.prove ctxt [] [] prop (K (ALLGOALS (fact_tac [th])))

          |> Thm.default_position_of th;

        val res =

          (case get_first (try prove_fact) (potential_facts ctxt prop) of

            SOME res => res

          | NONE => error ("Failed to retrieve literal fact" ^ Position.str_of pos ^ ":\n" ^

              Syntax.string_of_term ctxt prop))

      in pick "" [res] end

  | retrieve_thms pick ctxt xthmref =

      let

        val thy = theory_of ctxt;

        val local_facts = facts_of ctxt;

        val thmref = Facts.map_name_of_ref (Facts.intern local_facts) xthmref;

        val name = Facts.name_of_ref thmref;

        val pos = Facts.pos_of_ref xthmref;

        val thms =

          if name = "" then [Thm.transfer thy Drule.dummy_thm]

          else

            (case Facts.lookup (Context.Proof ctxt) local_facts name of

              SOME (_, ths) => (Position.report (Markup.local_fact name) pos;

                map (Thm.transfer thy) (Facts.select thmref ths))

            | NONE => PureThy.get_fact (Context.Proof ctxt) thy xthmref);

      in pick name thms end;

in

val get_fact = retrieve_thms (K I);

val get_fact_single = retrieve_thms Facts.the_single;

fun get_thms ctxt = get_fact ctxt o Facts.named;

fun get_thm ctxt = get_fact_single ctxt o Facts.named;

end;

(* name space operations *)

val add_path        = map_naming o NameSpace.add_path;

val no_base_names   = map_naming NameSpace.no_base_names;

val qualified_names = map_naming NameSpace.qualified_names;

val sticky_prefix   = map_naming o NameSpace.sticky_prefix;

val restore_naming  = map_naming o K o naming_of;

val reset_naming    = map_naming (K local_naming);

(* facts *)

local

fun update_thms _ (b, NONE) ctxt = ctxt |> map_facts (Facts.del (full_name ctxt b))

  | update_thms do_props (b, SOME ths) ctxt = ctxt |> map_facts

      (Facts.add_local do_props (naming_of ctxt) (b, ths) #> snd);

fun gen_note_thmss get k = fold_map (fn ((b, more_attrs), raw_facts) => fn ctxt =>

  let

    val pos = Binding.pos_of b;

    val name = full_name ctxt b;

    val _ = ContextPosition.report_visible ctxt (Markup.local_fact_decl name) pos;

    val facts = PureThy.name_thmss false pos name (map (apfst (get ctxt)) raw_facts);

    fun app (th, attrs) x =

      swap (foldl_map (Thm.proof_attributes (surround (Thm.kind k) (attrs @ more_attrs))) (x, th));

    val (res, ctxt') = fold_map app facts ctxt;

    val thms = PureThy.name_thms false false pos name (flat res);

    val Mode {stmt, ...} = get_mode ctxt;

  in ((name, thms), ctxt' |> update_thms stmt (b, SOME thms)) end);

in

fun note_thmss k = gen_note_thmss get_fact k;

fun note_thmss_i k = gen_note_thmss (K I) k;

fun put_thms do_props thms ctxt = ctxt

  |> map_naming (K local_naming)

  |> ContextPosition.set_visible false