src/Provers/simplifier.ML
author nipkow
Tue, 10 Mar 1998 19:02:20 +0100
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permissions -rw-r--r--
The new asm_lr_simp_tac is the old asm_full_simp_tac. The new asm_full_simp_tac also does a limited amount of mutual simplification.
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(*  Title:      Provers/simplifier.ML
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    ID:         $Id$
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    Author:     Tobias Nipkow and Markus Wenzel, TU Muenchen
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Generic simplifier, suitable for most logics.  See also Pure/thm.ML
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for the actual meta level rewriting engine.
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*)
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infix 4
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  setsubgoaler setloop addloop delloop setSSolver addSSolver setSolver
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  addSolver addsimps delsimps addeqcongs deleqcongs
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  setmksimps setmkeqTrue setmksym settermless addsimprocs delsimprocs;
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signature SIMPLIFIER =
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sig
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  type simproc
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  val mk_simproc: string -> cterm list
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    -> (Sign.sg -> thm list -> term -> thm option) -> simproc
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  type simpset
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  val empty_ss: simpset
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  val rep_ss: simpset ->
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   {mss: meta_simpset,
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    subgoal_tac:        simpset -> int -> tactic,
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    loop_tacs:          (string * (int -> tactic))list,
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           finish_tac: thm list -> int -> tactic,
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    unsafe_finish_tac: thm list -> int -> tactic};
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  val print_ss: simpset -> unit
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  val print_simpset: theory -> unit
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  val setsubgoaler: simpset *  (simpset -> int -> tactic) -> simpset
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  val setloop:      simpset *             (int -> tactic) -> simpset
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  val addloop:      simpset *  (string * (int -> tactic)) -> simpset
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  val delloop:      simpset *   string                    -> simpset
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  val setSSolver:   simpset * (thm list -> int -> tactic) -> simpset
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  val addSSolver:   simpset * (thm list -> int -> tactic) -> simpset
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  val setSolver:    simpset * (thm list -> int -> tactic) -> simpset
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  val addSolver:    simpset * (thm list -> int -> tactic) -> simpset
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  val setmksimps:   simpset * (thm -> thm list) -> simpset
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  val setmkeqTrue:  simpset * (thm -> thm option) -> simpset
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  val setmksym:     simpset * (thm -> thm option) -> simpset
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  val settermless:  simpset * (term * term -> bool) -> simpset
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  val addsimps:     simpset * thm list -> simpset
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  val delsimps:     simpset * thm list -> simpset
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  val addeqcongs:   simpset * thm list -> simpset
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  val deleqcongs:   simpset * thm list -> simpset
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  val addsimprocs:  simpset * simproc list -> simpset
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  val delsimprocs:  simpset * simproc list -> simpset
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  val merge_ss:     simpset * simpset -> simpset
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  val prems_of_ss:  simpset -> thm list
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  val simpset_thy_data: string * (object * (object -> object) *
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    (object * object -> object) * (Sign.sg -> object -> unit))
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  val simpset_ref_of_sg: Sign.sg -> simpset ref
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  val simpset_ref_of: theory -> simpset ref
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  val simpset_of_sg: Sign.sg -> simpset
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  val simpset_of: theory -> simpset
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  val SIMPSET: (simpset -> tactic) -> tactic
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  val SIMPSET': (simpset -> 'a -> tactic) -> 'a -> tactic
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  val simpset: unit -> simpset
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  val simpset_ref: unit -> simpset ref
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  val Addsimps: thm list -> unit
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  val Delsimps: thm list -> unit
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  val Addsimprocs: simproc list -> unit
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  val Delsimprocs: simproc list -> unit
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  val               simp_tac: simpset -> int -> tactic
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  val           asm_simp_tac: simpset -> int -> tactic
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  val          full_simp_tac: simpset -> int -> tactic
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  val        asm_lr_simp_tac: simpset -> int -> tactic
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  val      asm_full_simp_tac: simpset -> int -> tactic
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  val safe_asm_full_simp_tac: simpset -> int -> tactic
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  val               Simp_tac:            int -> tactic
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  val           Asm_simp_tac:            int -> tactic
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  val          Full_simp_tac:            int -> tactic
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  val        Asm_lr_simp_tac:            int -> tactic
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  val      Asm_full_simp_tac:            int -> tactic
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  val          simplify: simpset -> thm -> thm
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  val      asm_simplify: simpset -> thm -> thm
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  val     full_simplify: simpset -> thm -> thm
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  val asm_full_simplify: simpset -> thm -> thm
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end;
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structure Simplifier: SIMPLIFIER =
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struct
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(** simplification procedures **)
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(* datatype simproc *)
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datatype simproc =
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  Simproc of string * cterm list * (Sign.sg -> thm list -> term -> thm option) * stamp;
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fun mk_simproc name lhss proc =
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  Simproc (name, map (Thm.cterm_fun Logic.varify) lhss, proc, stamp ());
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fun rep_simproc (Simproc args) = args;
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(** simplification sets **)
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(* type simpset *)
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datatype simpset =
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  Simpset of {
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    mss: meta_simpset,
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    subgoal_tac:        simpset -> int -> tactic,
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    loop_tacs:          (string * (int -> tactic))list,
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           finish_tac: thm list -> int -> tactic,
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    unsafe_finish_tac: thm list -> int -> tactic};
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fun make_ss (mss, subgoal_tac, loop_tacs, finish_tac, unsafe_finish_tac) =
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  Simpset {mss = mss, subgoal_tac = subgoal_tac, loop_tacs = loop_tacs,
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    finish_tac = finish_tac, unsafe_finish_tac = unsafe_finish_tac};
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val empty_ss =
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  let val mss = Thm.set_mk_sym(Thm.empty_mss, Some o symmetric_fun)
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  in make_ss (mss, K (K no_tac), [], K (K no_tac), K (K no_tac)) end;
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fun rep_ss (Simpset args) = args;
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fun prems_of_ss (Simpset {mss, ...}) = Thm.prems_of_mss mss;
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(* print simpsets *)
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fun print_ss ss =
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  let
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    val Simpset {mss, ...} = ss;
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    val {simps, procs, congs} = Thm.dest_mss mss;
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    val pretty_thms = map Display.pretty_thm;
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    fun pretty_proc (name, lhss) =
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      Pretty.big_list (name ^ ":") (map Display.pretty_cterm lhss);
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  in
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    Pretty.writeln (Pretty.big_list "simplification rules:" (pretty_thms simps));
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    Pretty.writeln (Pretty.big_list "simplification procedures:" (map pretty_proc procs));
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    Pretty.writeln (Pretty.big_list "congruences:" (pretty_thms congs))
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  end;
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(* extend simpsets *)
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fun (Simpset {mss, subgoal_tac = _, loop_tacs, finish_tac, unsafe_finish_tac})
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    setsubgoaler subgoal_tac =
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  make_ss (mss, subgoal_tac, loop_tacs, finish_tac, unsafe_finish_tac);
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fun (Simpset {mss, subgoal_tac, loop_tacs = _, finish_tac, unsafe_finish_tac})
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    setloop tac =
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  make_ss (mss, subgoal_tac, [("",tac)], finish_tac, unsafe_finish_tac);
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fun (Simpset {mss, subgoal_tac, loop_tacs, finish_tac, unsafe_finish_tac})
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    addloop atac =
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  make_ss (mss, subgoal_tac, overwrite(loop_tacs,atac),
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           finish_tac, unsafe_finish_tac);
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fun (ss as Simpset {mss,subgoal_tac,loop_tacs,finish_tac,unsafe_finish_tac})
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    delloop name =
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  let val (del,rest) = partition (fn (n,_) => n=name) loop_tacs
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  in if null del then (warning ("No such looper in simpset: " ^ name); ss)
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     else make_ss (mss, subgoal_tac, rest, finish_tac, unsafe_finish_tac)
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  end;
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fun (Simpset {mss, subgoal_tac, loop_tacs, finish_tac = _, unsafe_finish_tac})
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    setSSolver finish_tac =
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  make_ss (mss, subgoal_tac, loop_tacs, finish_tac, unsafe_finish_tac);
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fun (Simpset {mss, subgoal_tac, loop_tacs, finish_tac, unsafe_finish_tac})
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    addSSolver tac =
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  make_ss (mss, subgoal_tac, loop_tacs, fn hyps => finish_tac hyps ORELSE' tac hyps,
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    unsafe_finish_tac);
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fun (Simpset {mss, subgoal_tac, loop_tacs, finish_tac, unsafe_finish_tac = _})
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    setSolver unsafe_finish_tac =
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  make_ss (mss, subgoal_tac, loop_tacs, finish_tac, unsafe_finish_tac);
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fun (Simpset {mss, subgoal_tac, loop_tacs, finish_tac, unsafe_finish_tac})
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    addSolver tac =
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  make_ss (mss, subgoal_tac, loop_tacs, finish_tac,
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    fn hyps => unsafe_finish_tac hyps ORELSE' tac hyps);
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fun (Simpset {mss, subgoal_tac, loop_tacs, finish_tac, unsafe_finish_tac})
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    setmksimps mk_simps =
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  make_ss (Thm.set_mk_rews (mss, map (Thm.strip_shyps o Drule.zero_var_indexes) o mk_simps),
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    subgoal_tac, loop_tacs, finish_tac, unsafe_finish_tac);
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fun (Simpset {mss, subgoal_tac, loop_tacs, finish_tac, unsafe_finish_tac})
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    setmkeqTrue mk_eq_True =
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  make_ss (Thm.set_mk_eq_True (mss, mk_eq_True),
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    subgoal_tac, loop_tacs, finish_tac, unsafe_finish_tac);
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fun (Simpset {mss, subgoal_tac, loop_tacs, finish_tac, unsafe_finish_tac})
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    setmksym mksym =
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  make_ss (Thm.set_mk_sym (mss, mksym),
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    subgoal_tac, loop_tacs, finish_tac, unsafe_finish_tac);
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fun (Simpset {mss, subgoal_tac, loop_tacs,  finish_tac, unsafe_finish_tac})
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    settermless termless =
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  make_ss (Thm.set_termless (mss, termless), subgoal_tac, loop_tacs,
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    finish_tac, unsafe_finish_tac);
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fun (Simpset {mss, subgoal_tac, loop_tacs, finish_tac, unsafe_finish_tac})
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    addsimps rews =
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  make_ss (Thm.add_simps (mss, rews), subgoal_tac, loop_tacs,
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           finish_tac, unsafe_finish_tac);
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fun (Simpset {mss, subgoal_tac, loop_tacs, finish_tac, unsafe_finish_tac})
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    delsimps rews =
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  make_ss (Thm.del_simps (mss, rews), subgoal_tac, loop_tacs,
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           finish_tac, unsafe_finish_tac);
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fun (Simpset {mss, subgoal_tac, loop_tacs, finish_tac, unsafe_finish_tac})
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    addeqcongs newcongs =
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  make_ss (Thm.add_congs (mss, newcongs), subgoal_tac, loop_tacs,
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    finish_tac, unsafe_finish_tac);
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fun (Simpset {mss, subgoal_tac, loop_tacs, finish_tac, unsafe_finish_tac})
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    deleqcongs oldcongs =
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  make_ss (Thm.del_congs (mss, oldcongs), subgoal_tac, loop_tacs,
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    finish_tac, unsafe_finish_tac);
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fun (Simpset {mss, subgoal_tac, loop_tacs, finish_tac, unsafe_finish_tac})
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    addsimprocs simprocs =
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  make_ss
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    (Thm.add_simprocs (mss, map rep_simproc simprocs),
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      subgoal_tac, loop_tacs, finish_tac, unsafe_finish_tac);
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fun (Simpset {mss, subgoal_tac, loop_tacs, finish_tac, unsafe_finish_tac})
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    delsimprocs simprocs =
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  make_ss
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    (Thm.del_simprocs (mss, map rep_simproc simprocs),
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      subgoal_tac, loop_tacs, finish_tac, unsafe_finish_tac);
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(* merge simpsets *)	(*NOTE: ignores tactics of 2nd simpset*)
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fun merge_ss
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   (Simpset {mss = mss1, loop_tacs = loop_tacs1,
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             subgoal_tac, finish_tac, unsafe_finish_tac},
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    Simpset {mss = mss2, loop_tacs = loop_tacs2, ...}) =
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  make_ss (Thm.merge_mss (mss1, mss2), subgoal_tac,
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           foldl overwrite (loop_tacs1,loop_tacs2),
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           finish_tac, unsafe_finish_tac);
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(** simpset theory data **)
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(* data kind simpset *)
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val simpsetK = "simpset";
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exception SimpsetData of simpset ref;
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local
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  val empty = SimpsetData (ref empty_ss);
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  (*create new reference*)
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  fun prep_ext (SimpsetData (ref ss)) = SimpsetData (ref ss);
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  fun merge (SimpsetData (ref ss1), SimpsetData (ref ss2)) =
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    SimpsetData (ref (merge_ss (ss1, ss2)));
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  fun print (_: Sign.sg) (SimpsetData (ref ss)) = print_ss ss;
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in
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  val simpset_thy_data = (simpsetK, (empty, prep_ext, merge, print));
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end;
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(* access simpset *)
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fun print_simpset thy = Display.print_data thy simpsetK;
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fun simpset_ref_of_sg sg =
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  (case Sign.get_data sg simpsetK of
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    SimpsetData r => r
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  | _ => sys_error "simpset_ref_of_sg")
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val simpset_ref_of = simpset_ref_of_sg o sign_of;
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val simpset_of_sg = ! o simpset_ref_of_sg;
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val simpset_of = simpset_of_sg o sign_of;
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fun SIMPSET tacf state = tacf (simpset_of_sg (sign_of_thm state)) state;
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fun SIMPSET' tacf i state = tacf (simpset_of_sg (sign_of_thm state)) i state;
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val simpset = simpset_of o Context.get_context;
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val simpset_ref = simpset_ref_of_sg o sign_of o Context.get_context;
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(* change simpset *)
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fun change_simpset f x = simpset_ref () := (f (simpset (), x));
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val Addsimps = change_simpset (op addsimps);
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val Delsimps = change_simpset (op delsimps);
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val Addsimprocs = change_simpset (op addsimprocs);
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val Delsimprocs = change_simpset (op delsimprocs);
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(** simplification tactics **)
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fun solve_all_tac (subgoal_tac, loop_tacs, finish_tac, unsafe_finish_tac) mss =
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  let
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    val ss =
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      make_ss (mss, subgoal_tac, loop_tacs, unsafe_finish_tac, unsafe_finish_tac);
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    val solve1_tac = (subgoal_tac ss THEN_ALL_NEW (K no_tac)) 1
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  in DEPTH_SOLVE solve1_tac end;
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fun loop_tac loop_tacs = FIRST'(map snd loop_tacs);
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(*not totally safe: may instantiate unknowns that appear also in other subgoals*)
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fun basic_gen_simp_tac mode =
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  fn (Simpset {mss, subgoal_tac, loop_tacs, finish_tac, unsafe_finish_tac}) =>
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    let
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      fun simp_loop_tac i =
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        asm_rewrite_goal_tac mode
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          (solve_all_tac (subgoal_tac,loop_tacs,finish_tac,unsafe_finish_tac))
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          mss i
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        THEN (finish_tac (prems_of_mss mss) i ORELSE
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              TRY ((loop_tac loop_tacs THEN_ALL_NEW simp_loop_tac) i))
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    in simp_loop_tac end;
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fun gen_simp_tac mode (ss as Simpset {unsafe_finish_tac, ...}) =
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  basic_gen_simp_tac mode (ss setSSolver unsafe_finish_tac);
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val          simp_tac = gen_simp_tac (false, false, false);
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val      asm_simp_tac = gen_simp_tac (false, true, false);
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val     full_simp_tac = gen_simp_tac (true,  false, false);
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val   asm_lr_simp_tac = gen_simp_tac (true,  true, false);
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val asm_full_simp_tac = gen_simp_tac (true,  true, true);
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(*not totally safe: may instantiate unknowns that appear also in other subgoals*)
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val safe_asm_full_simp_tac = basic_gen_simp_tac (true, true, false);
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(** The abstraction over the proof state delays the dereferencing **)
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fun          Simp_tac i st =          simp_tac (simpset ()) i st;
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fun      Asm_simp_tac i st =      asm_simp_tac (simpset ()) i st;
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fun     Full_simp_tac i st =     full_simp_tac (simpset ()) i st;
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fun   Asm_lr_simp_tac i st =   asm_lr_simp_tac (simpset ()) i st;
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fun Asm_full_simp_tac i st = asm_full_simp_tac (simpset ()) i st;
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(** simplification meta rules **)
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fun simp mode (Simpset {mss, subgoal_tac, loop_tacs, finish_tac, unsafe_finish_tac}) thm =
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  let
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    val tacf = solve_all_tac (subgoal_tac, loop_tacs, finish_tac, unsafe_finish_tac);
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    fun prover m th = apsome fst (Seq.pull (tacf m th));
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  in
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    Drule.rewrite_thm mode prover mss thm
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  end;
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val          simplify = simp (false, false, false);
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val      asm_simplify = simp (false, true, false);
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val     full_simplify = simp (true, false, false);
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val asm_full_simplify = simp (true, true, false);
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end;