src/Pure/meta_simplifier.ML
author wenzelm
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(*  Title:      Pure/meta_simplifier.ML
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    ID:         $Id$
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    Author:     Tobias Nipkow and Stefan Berghofer
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Meta-level Simplification.
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*)
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infix 4
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  addsimps delsimps addeqcongs deleqcongs addcongs delcongs addsimprocs delsimprocs
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  setmksimps setmkcong setmksym setmkeqTrue settermless setsubgoaler
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  setloop addloop delloop setSSolver addSSolver setSolver addSolver;
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signature BASIC_META_SIMPLIFIER =
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sig
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  val debug_simp: bool ref
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  val trace_simp: bool ref
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  val simp_depth_limit: int ref
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  type rrule
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  type cong
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  type solver
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  val mk_solver: string -> (thm list -> int -> tactic) -> solver
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  type simpset
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  type proc
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  val rep_ss: simpset ->
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   {rules: rrule Net.net,
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    prems: thm list,
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    bounds: string list,
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    depth: int} *
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   {congs: (string * cong) list * string list,
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    procs: proc Net.net,
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    mk_rews:
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     {mk: thm -> thm list,
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      mk_cong: thm -> thm,
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      mk_sym: thm -> thm option,
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      mk_eq_True: thm -> thm option},
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    termless: term * term -> bool,
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    subgoal_tac: simpset -> int -> tactic,
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    loop_tacs: (string * (int -> tactic)) list,
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    solvers: solver list * solver list}
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  val print_ss: simpset -> unit
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  val empty_ss: simpset
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  val merge_ss: simpset * simpset -> simpset
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  type simproc
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  val mk_simproc: string -> cterm list ->
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    (Sign.sg -> simpset -> term -> thm option) -> simproc
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  val add_prems: thm list -> simpset -> simpset
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  val prems_of_ss: simpset -> thm list
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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 addcongs: simpset * thm list -> simpset
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  val delcongs: 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 setmksimps: simpset * (thm -> thm list) -> simpset
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  val setmkcong: simpset * (thm -> thm) -> simpset
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  val setmksym: simpset * (thm -> thm option) -> simpset
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  val setmkeqTrue: simpset * (thm -> thm option) -> simpset
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  val settermless: simpset * (term * term -> bool) -> simpset
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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 * solver -> simpset
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  val addSSolver: simpset * solver -> simpset
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  val setSolver: simpset * solver -> simpset
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  val addSolver: simpset * solver -> simpset
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  val generic_simp_tac: bool -> bool * bool * bool -> simpset -> int -> tactic
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end;
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signature META_SIMPLIFIER =
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sig
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  include BASIC_META_SIMPLIFIER
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  exception SIMPLIFIER of string * thm
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  val clear_ss: simpset -> simpset
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  exception SIMPROC_FAIL of string * exn
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  val simproc_i: Sign.sg -> string -> term list
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    -> (Sign.sg -> simpset -> term -> thm option) -> simproc
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  val simproc: Sign.sg -> string -> string list
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    -> (Sign.sg -> simpset -> term -> thm option) -> simproc
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  val rewrite_cterm: bool * bool * bool ->
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    (simpset -> thm -> thm option) -> simpset -> cterm -> thm
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  val rewrite_aux: (simpset -> thm -> thm option) -> bool -> thm list -> cterm -> thm
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  val simplify_aux: (simpset -> thm -> thm option) -> bool -> thm list -> thm -> thm
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  val rewrite_term: Sign.sg -> thm list -> (term -> term option) list -> term -> term
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  val rewrite_thm: bool * bool * bool ->
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    (simpset -> thm -> thm option) -> simpset -> thm -> thm
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  val rewrite_goals_rule_aux: (simpset -> thm -> thm option) -> thm list -> thm -> thm
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  val rewrite_goal_rule: bool * bool * bool ->
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    (simpset -> thm -> thm option) -> simpset -> int -> thm -> thm
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  val asm_rewrite_goal_tac: bool * bool * bool ->
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    (simpset -> tactic) -> simpset -> int -> tactic
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  val simp_thm: bool * bool * bool -> simpset -> thm -> thm
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  val simp_cterm: bool * bool * bool -> simpset -> cterm -> thm
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end;
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structure MetaSimplifier: META_SIMPLIFIER =
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struct
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(** diagnostics **)
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exception SIMPLIFIER of string * thm;
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val debug_simp = ref false;
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val trace_simp = ref false;
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val simp_depth = ref 0;
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val simp_depth_limit = ref 1000;
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local
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fun println a =
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  tracing (case ! simp_depth of 0 => a | n => enclose "[" "]" (string_of_int n) ^ a);
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fun prnt warn a = if warn then warning a else println a;
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fun prtm warn a sg t = prnt warn (a ^ "\n" ^ Sign.string_of_term sg t);
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fun prctm warn a t = prnt warn (a ^ "\n" ^ Display.string_of_cterm t);
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in
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fun debug warn a = if ! debug_simp then prnt warn a else ();
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fun trace warn a = if ! trace_simp then prnt warn a else ();
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fun debug_term warn a sign t = if ! debug_simp then prtm warn a sign t else ();
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fun trace_term warn a sign t = if ! trace_simp then prtm warn a sign t else ();
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fun trace_cterm warn a ct = if ! trace_simp then prctm warn a ct else ();
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fun trace_thm a th = if ! trace_simp then prctm false a (Thm.cprop_of th) else ();
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fun trace_named_thm a (thm, name) =
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  if ! trace_simp then
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    prctm false (if name = "" then a else a ^ " " ^ quote name ^ ":") (Thm.cprop_of thm)
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  else ();
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fun warn_thm a = prctm true a o Thm.cprop_of;
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end;
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(** datatype simpset **)
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(* rewrite rules *)
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type rrule = {thm: thm, name: string, lhs: term, elhs: cterm, fo: bool, perm: bool};
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(*thm: the rewrite rule;
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  name: name of theorem from which rewrite rule was extracted;
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  lhs: the left-hand side;
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  elhs: the etac-contracted lhs;
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  fo: use first-order matching;
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  perm: the rewrite rule is permutative;
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Remarks:
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  - elhs is used for matching,
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    lhs only for preservation of bound variable names;
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  - fo is set iff
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    either elhs is first-order (no Var is applied),
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      in which case fo-matching is complete,
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    or elhs is not a pattern,
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      in which case there is nothing better to do;*)
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fun eq_rrule ({thm = thm1, ...}: rrule, {thm = thm2, ...}: rrule) =
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  Drule.eq_thm_prop (thm1, thm2);
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(* congruences *)
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type cong = {thm: thm, lhs: cterm};
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fun eq_cong ({thm = thm1, ...}: cong, {thm = thm2, ...}: cong) =
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  Drule.eq_thm_prop (thm1, thm2);
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(* solvers *)
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datatype solver =
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  Solver of
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   {name: string,
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    solver: thm list -> int -> tactic,
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    id: stamp};
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fun mk_solver name solver = Solver {name = name, solver = solver, id = stamp ()};
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fun solver_name (Solver {name, ...}) = name;
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fun solver ths (Solver {solver = tacf, ...}) = tacf ths;
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fun eq_solver (Solver {id = id1, ...}, Solver {id = id2, ...}) = (id1 = id2);
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val merge_solvers = gen_merge_lists eq_solver;
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(* simplification sets and procedures *)
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(*A simpset contains data required during conversion:
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    rules: discrimination net of rewrite rules;
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    prems: current premises;
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    bounds: names of bound variables already used
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      (for generating new names when rewriting under lambda abstractions);
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    depth: depth of conditional rewriting;
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    congs: association list of congruence rules and
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           a list of `weak' congruence constants.
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           A congruence is `weak' if it avoids normalization of some argument.
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    procs: discrimination net of simplification procedures
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      (functions that prove rewrite rules on the fly);
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    mk_rews:
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      mk: turn simplification thms into rewrite rules;
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      mk_cong: prepare congruence rules;
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      mk_sym: turn == around;
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      mk_eq_True: turn P into P == True;
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    termless: relation for ordered rewriting;*)
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type mk_rews =
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 {mk: thm -> thm list,
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  mk_cong: thm -> thm,
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  mk_sym: thm -> thm option,
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  mk_eq_True: thm -> thm option};
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datatype simpset =
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  Simpset of
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   {rules: rrule Net.net,
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    prems: thm list,
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    bounds: string list,
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    depth: int} *
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   {congs: (string * cong) list * string list,
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    procs: proc Net.net,
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    mk_rews: mk_rews,
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    termless: term * term -> bool,
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    subgoal_tac: simpset -> int -> tactic,
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    loop_tacs: (string * (int -> tactic)) list,
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    solvers: solver list * solver list}
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and proc =
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  Proc of
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   {name: string,
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    lhs: cterm,
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    proc: Sign.sg -> simpset -> term -> thm option,
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    id: stamp};
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fun eq_proc (Proc {id = id1, ...}, Proc {id = id2, ...}) = (id1 = id2);
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fun rep_ss (Simpset args) = args;
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fun make_ss1 (rules, prems, bounds, depth) =
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  {rules = rules, prems = prems, bounds = bounds, depth = depth};
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fun map_ss1 f {rules, prems, bounds, depth} =
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  make_ss1 (f (rules, prems, bounds, depth));
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fun make_ss2 (congs, procs, mk_rews, termless, subgoal_tac, loop_tacs, solvers) =
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  {congs = congs, procs = procs, mk_rews = mk_rews, termless = termless,
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    subgoal_tac = subgoal_tac, loop_tacs = loop_tacs, solvers = solvers};
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fun map_ss2 f {congs, procs, mk_rews, termless, subgoal_tac, loop_tacs, solvers} =
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  make_ss2 (f (congs, procs, mk_rews, termless, subgoal_tac, loop_tacs, solvers));
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fun make_simpset (args1, args2) = Simpset (make_ss1 args1, make_ss2 args2);
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fun map_simpset f (Simpset ({rules, prems, bounds, depth},
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    {congs, procs, mk_rews, termless, subgoal_tac, loop_tacs, solvers})) =
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  make_simpset (f ((rules, prems, bounds, depth),
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    (congs, procs, mk_rews, termless, subgoal_tac, loop_tacs, solvers)));
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fun map_simpset1 f (Simpset (r1, r2)) = Simpset (map_ss1 f r1, r2);
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fun map_simpset2 f (Simpset (r1, r2)) = Simpset (r1, map_ss2 f r2);
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(* print simpsets *)
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fun print_ss ss =
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  let
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    val pretty_thms = map Display.pretty_thm;
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    fun pretty_cong (name, th) =
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      Pretty.block [Pretty.str (name ^ ":"), Pretty.brk 1, Display.pretty_thm th];
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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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    val Simpset ({rules, ...}, {congs, procs, loop_tacs, solvers, ...}) = ss;
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    val smps = map (#thm o #2) (Net.dest rules);
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    val cngs = map (fn (name, {thm, ...}) => (name, thm)) (#1 congs);
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    val prcs = Net.dest procs |>
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      map (fn (_, Proc {name, lhs, id, ...}) => ((name, lhs), id))
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      |> partition_eq eq_snd
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      |> map (fn ps => (#1 (#1 (hd ps)), map (#2 o #1) ps))
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      |> Library.sort_wrt #1;
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  in
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    [Pretty.big_list "simplification rules:" (pretty_thms smps),
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      Pretty.big_list "simplification procedures:" (map pretty_proc prcs),
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      Pretty.big_list "congruences:" (map pretty_cong cngs),
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      Pretty.strs ("loopers:" :: map (quote o #1) loop_tacs),
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      Pretty.strs ("unsafe solvers:" :: map (quote o solver_name) (#1 solvers)),
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      Pretty.strs ("safe solvers:" :: map (quote o solver_name) (#2 solvers))]
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    |> Pretty.chunks |> Pretty.writeln
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  end;
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(* empty simpsets *)
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local
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fun init_ss mk_rews termless subgoal_tac solvers =
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  make_simpset ((Net.empty, [], [], 0),
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    (([], []), Net.empty, mk_rews, termless, subgoal_tac, [], solvers));
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val basic_mk_rews: mk_rews =
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 {mk = fn th => if can Logic.dest_equals (Thm.concl_of th) then [th] else [],
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  mk_cong = I,
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  mk_sym = Some o Drule.symmetric_fun,
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  mk_eq_True = K None};
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in
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val empty_ss = init_ss basic_mk_rews Term.termless (K (K no_tac)) ([], []);
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fun clear_ss (Simpset (_, {mk_rews, termless, subgoal_tac, solvers, ...})) =
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  init_ss mk_rews termless subgoal_tac solvers;
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end;
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(* merge simpsets *)            (*NOTE: ignores some fields of 2nd simpset*)
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fun merge_ss (ss1, ss2) =
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  let
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    val Simpset ({rules = rules1, prems = prems1, bounds = bounds1, depth},
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     {congs = (congs1, weak1), procs = procs1, mk_rews, termless, subgoal_tac,
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      loop_tacs = loop_tacs1, solvers = (unsafe_solvers1, solvers1)}) = ss1;
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    val Simpset ({rules = rules2, prems = prems2, bounds = bounds2, depth = _},
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     {congs = (congs2, weak2), procs = procs2, mk_rews = _, termless = _, subgoal_tac = _,
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      loop_tacs = loop_tacs2, solvers = (unsafe_solvers2, solvers2)}) = ss2;
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    val rules' = Net.merge (rules1, rules2, eq_rrule);
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    val prems' = gen_merge_lists Drule.eq_thm_prop prems1 prems2;
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    val bounds' = merge_lists bounds1 bounds2;
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    val congs' = gen_merge_lists (eq_cong o pairself #2) congs1 congs2;
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    val weak' = merge_lists weak1 weak2;
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    val procs' = Net.merge (procs1, procs2, eq_proc);
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    val loop_tacs' = merge_alists loop_tacs1 loop_tacs2;
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    val unsafe_solvers' = merge_solvers unsafe_solvers1 unsafe_solvers2;
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    val solvers' = merge_solvers solvers1 solvers2;
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  in
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    make_simpset ((rules', prems', bounds', depth), ((congs', weak'), procs',
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      mk_rews, termless, subgoal_tac, loop_tacs', (unsafe_solvers', solvers')))
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  end;
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(* simprocs *)
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exception SIMPROC_FAIL of string * exn;
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datatype simproc = Simproc of proc list;
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fun mk_simproc name lhss proc =
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  let val id = stamp () in
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    Simproc (lhss |> map (fn lhs =>
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      Proc {name = name, lhs = lhs, proc = proc, id = id}))
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   355
  end;
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   356
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fun simproc_i sg name = mk_simproc name o map (Thm.cterm_of sg o Logic.varify);
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fun simproc sg name = simproc_i sg name o map (Sign.simple_read_term sg TypeInfer.logicT);
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(** simpset operations **)
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   363
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(* bounds and prems *)
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   365
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fun add_bound b = map_simpset1 (fn (rules, prems, bounds, depth) =>
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   367
  (rules, prems, b :: bounds, depth));
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fun add_prems ths = map_simpset1 (fn (rules, prems, bounds, depth) =>
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   370
  (rules, ths @ prems, bounds, depth));
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   371
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   372
fun prems_of_ss (Simpset ({prems, ...}, _)) = prems;
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   374
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   375
(* addsimps *)
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   376
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   377
fun mk_rrule2 {thm, name, lhs, elhs, perm} =
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   378
  let
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   379
    val fo = Pattern.first_order (term_of elhs) orelse not (Pattern.pattern (term_of elhs))
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   380
  in {thm = thm, name = name, lhs = lhs, elhs = elhs, fo = fo, perm = perm} end;
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   381
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   382
fun insert_rrule quiet (ss, rrule as {thm, name, lhs, elhs, perm}) =
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   383
 (trace_named_thm "Adding rewrite rule" (thm, name);
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   384
  ss |> map_simpset1 (fn (rules, prems, bounds, depth) =>
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   385
    let
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   386
      val rrule2 as {elhs, ...} = mk_rrule2 rrule;
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   387
      val rules' = Net.insert_term ((term_of elhs, rrule2), rules, eq_rrule);
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   388
    in (rules', prems, bounds, depth) end)
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   389
  handle Net.INSERT =>
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   390
    (if quiet then () else warn_thm "Ignoring duplicate rewrite rule:" thm; ss));
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   391
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   392
fun vperm (Var _, Var _) = true
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berghofe
parents:
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   393
  | vperm (Abs (_, _, s), Abs (_, _, t)) = vperm (s, t)
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berghofe
parents:
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   394
  | vperm (t1 $ t2, u1 $ u2) = vperm (t1, u1) andalso vperm (t2, u2)
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berghofe
parents:
diff changeset
   395
  | vperm (t, u) = (t = u);
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berghofe
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diff changeset
   396
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berghofe
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diff changeset
   397
fun var_perm (t, u) =
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berghofe
parents:
diff changeset
   398
  vperm (t, u) andalso eq_set (term_varnames t, term_varnames u);
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berghofe
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diff changeset
   399
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berghofe
parents:
diff changeset
   400
(* FIXME: it seems that the conditions on extra variables are too liberal if
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berghofe
parents:
diff changeset
   401
prems are nonempty: does solving the prems really guarantee instantiation of
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berghofe
parents:
diff changeset
   402
all its Vars? Better: a dynamic check each time a rule is applied.
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berghofe
parents:
diff changeset
   403
*)
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berghofe
parents:
diff changeset
   404
fun rewrite_rule_extra_vars prems elhs erhs =
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berghofe
parents:
diff changeset
   405
  not (term_varnames erhs subset foldl add_term_varnames (term_varnames elhs, prems))
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berghofe
parents:
diff changeset
   406
  orelse
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wenzelm
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diff changeset
   407
  not (term_tvars erhs subset (term_tvars elhs union List.concat (map term_tvars prems)));
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berghofe
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diff changeset
   408
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wenzelm
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diff changeset
   409
(*simple test for looping rewrite rules and stupid orientations*)
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berghofe
parents:
diff changeset
   410
fun reorient sign prems lhs rhs =
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wenzelm
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diff changeset
   411
  rewrite_rule_extra_vars prems lhs rhs
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diff changeset
   412
    orelse
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diff changeset
   413
  is_Var (head_of lhs)
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wenzelm
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diff changeset
   414
    orelse
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wenzelm
parents: 15011
diff changeset
   415
  exists (apl (lhs, Logic.occs)) (rhs :: prems)
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wenzelm
parents: 15011
diff changeset
   416
    orelse
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wenzelm
parents: 15011
diff changeset
   417
  null prems andalso Pattern.matches (Sign.tsig_of sign) (lhs, rhs)
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berghofe
parents:
diff changeset
   418
    (*the condition "null prems" is necessary because conditional rewrites
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berghofe
parents:
diff changeset
   419
      with extra variables in the conditions may terminate although
15023
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wenzelm
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diff changeset
   420
      the rhs is an instance of the lhs; example: ?m < ?n ==> f(?n) == f(?m)*)
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diff changeset
   421
    orelse
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wenzelm
parents: 15011
diff changeset
   422
  is_Const lhs andalso not (is_Const rhs);
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berghofe
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diff changeset
   423
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
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diff changeset
   424
fun decomp_simp thm =
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diff changeset
   425
  let
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wenzelm
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diff changeset
   426
    val {sign, prop, ...} = Thm.rep_thm thm;
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wenzelm
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diff changeset
   427
    val prems = Logic.strip_imp_prems prop;
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wenzelm
parents: 15011
diff changeset
   428
    val concl = Drule.strip_imp_concl (Thm.cprop_of thm);
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wenzelm
parents: 15011
diff changeset
   429
    val (lhs, rhs) = Drule.dest_equals concl handle TERM _ =>
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wenzelm
parents: 15011
diff changeset
   430
      raise SIMPLIFIER ("Rewrite rule not a meta-equality", thm);
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wenzelm
parents: 15011
diff changeset
   431
    val (_, elhs) = Drule.dest_equals (Thm.cprop_of (Thm.eta_conversion lhs));
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   432
    val elhs = if elhs = lhs then lhs else elhs;  (*share identical copies*)
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   433
    val erhs = Pattern.eta_contract (term_of rhs);
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   434
    val perm =
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   435
      var_perm (term_of elhs, erhs) andalso
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   436
      not (term_of elhs aconv erhs) andalso
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   437
      not (is_Var (term_of elhs));
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   438
  in (sign, prems, term_of lhs, elhs, term_of rhs, perm) end;
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   439
12783
36ca5ea8092c interface to Pattern.rewrite_term;
wenzelm
parents: 12779
diff changeset
   440
fun decomp_simp' thm =
12979
4c76bce4ce39 decomp_simp': use lhs instead of elhs (preserves more bound variable names);
wenzelm
parents: 12783
diff changeset
   441
  let val (_, _, lhs, _, rhs, _) = decomp_simp thm in
12783
36ca5ea8092c interface to Pattern.rewrite_term;
wenzelm
parents: 12779
diff changeset
   442
    if Thm.nprems_of thm > 0 then raise SIMPLIFIER ("Bad conditional rewrite rule", thm)
12979
4c76bce4ce39 decomp_simp': use lhs instead of elhs (preserves more bound variable names);
wenzelm
parents: 12783
diff changeset
   443
    else (lhs, rhs)
12783
36ca5ea8092c interface to Pattern.rewrite_term;
wenzelm
parents: 12779
diff changeset
   444
  end;
36ca5ea8092c interface to Pattern.rewrite_term;
wenzelm
parents: 12779
diff changeset
   445
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   446
fun mk_eq_True (Simpset (_, {mk_rews = {mk_eq_True, ...}, ...})) (thm, name) =
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   447
  (case mk_eq_True thm of
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   448
    None => []
13607
6908230623a3 Completely reimplemented mutual simplification of premises.
berghofe
parents: 13569
diff changeset
   449
  | Some eq_True =>
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   450
      let val (_, _, lhs, elhs, _, _) = decomp_simp eq_True
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   451
      in [{thm = eq_True, name = name, lhs = lhs, elhs = elhs, perm = false}] end);
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   452
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   453
(*create the rewrite rule and possibly also the eq_True variant,
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   454
  in case there are extra vars on the rhs*)
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   455
fun rrule_eq_True (thm, name, lhs, elhs, rhs, ss, thm2) =
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   456
  let val rrule = {thm = thm, name = name, lhs = lhs, elhs = elhs, perm = false} in
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   457
    if term_varnames rhs subset term_varnames lhs andalso
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   458
      term_tvars rhs subset term_tvars lhs then [rrule]
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   459
    else mk_eq_True ss (thm2, name) @ [rrule]
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   460
  end;
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   461
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   462
fun mk_rrule ss (thm, name) =
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   463
  let val (_, prems, lhs, elhs, rhs, perm) = decomp_simp thm in
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   464
    if perm then [{thm = thm, name = name, lhs = lhs, elhs = elhs, perm = true}]
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   465
    else
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   466
      (*weak test for loops*)
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   467
      if rewrite_rule_extra_vars prems lhs rhs orelse is_Var (term_of elhs)
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   468
      then mk_eq_True ss (thm, name)
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   469
      else rrule_eq_True (thm, name, lhs, elhs, rhs, ss, thm)
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   470
  end;
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   471
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   472
fun orient_rrule ss (thm, name) =
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   473
  let val (sign, prems, lhs, elhs, rhs, perm) = decomp_simp thm in
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   474
    if perm then [{thm = thm, name = name, lhs = lhs, elhs = elhs, perm = true}]
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   475
    else if reorient sign prems lhs rhs then
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   476
      if reorient sign prems rhs lhs
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   477
      then mk_eq_True ss (thm, name)
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   478
      else
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   479
        let val Simpset (_, {mk_rews = {mk_sym, ...}, ...}) = ss in
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   480
          (case mk_sym thm of
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   481
            None => []
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   482
          | Some thm' =>
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   483
              let val (_, _, lhs', elhs', rhs', _) = decomp_simp thm'
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   484
              in rrule_eq_True (thm', name, lhs', elhs', rhs', ss, thm) end)
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   485
        end
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   486
    else rrule_eq_True (thm, name, lhs, elhs, rhs, ss, thm)
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   487
  end;
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   488
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   489
fun extract_rews (Simpset (_, {mk_rews = {mk, ...}, ...}), thms) =
13607
6908230623a3 Completely reimplemented mutual simplification of premises.
berghofe
parents: 13569
diff changeset
   490
  flat (map (fn thm => map (rpair (Thm.name_of_thm thm)) (mk thm)) thms);
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   491
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   492
fun orient_comb_simps comb mk_rrule (ss, thms) =
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   493
  let
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   494
    val rews = extract_rews (ss, thms);
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   495
    val rrules = flat (map mk_rrule rews);
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   496
  in foldl comb (ss, rrules) end;
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   497
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   498
fun extract_safe_rrules (ss, thm) =
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   499
  flat (map (orient_rrule ss) (extract_rews (ss, [thm])));
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   500
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   501
(*add rewrite rules explicitly; do not reorient!*)
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   502
fun ss addsimps thms =
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   503
  orient_comb_simps (insert_rrule false) (mk_rrule ss) (ss, thms);
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   504
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   505
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   506
(* delsimps *)
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   507
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   508
fun del_rrule (ss, rrule as {thm, elhs, ...}) =
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   509
  ss |> map_simpset1 (fn (rules, prems, bounds, depth) =>
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   510
    (Net.delete_term ((term_of elhs, rrule), rules, eq_rrule), prems, bounds, depth))
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   511
  handle Net.DELETE => (warn_thm "Rewrite rule not in simpset:" thm; ss);
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   512
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   513
fun ss delsimps thms =
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   514
  orient_comb_simps del_rrule (map mk_rrule2 o mk_rrule ss) (ss, thms);
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   515
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   516
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   517
(* congs *)
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   518
13835
12b2ffbe543a Change to meta simplifier: congruence rules may now have frees as head of term.
ballarin
parents: 13828
diff changeset
   519
fun cong_name (Const (a, _)) = Some a
12b2ffbe543a Change to meta simplifier: congruence rules may now have frees as head of term.
ballarin
parents: 13828
diff changeset
   520
  | cong_name (Free (a, _)) = Some ("Free: " ^ a)
12b2ffbe543a Change to meta simplifier: congruence rules may now have frees as head of term.
ballarin
parents: 13828
diff changeset
   521
  | cong_name _ = None;
12b2ffbe543a Change to meta simplifier: congruence rules may now have frees as head of term.
ballarin
parents: 13828
diff changeset
   522
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   523
local
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   524
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   525
fun is_full_cong_prems [] [] = true
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   526
  | is_full_cong_prems [] _ = false
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   527
  | is_full_cong_prems (p :: prems) varpairs =
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   528
      (case Logic.strip_assums_concl p of
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   529
        Const ("==", _) $ lhs $ rhs =>
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   530
          let val (x, xs) = strip_comb lhs and (y, ys) = strip_comb rhs in
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   531
            is_Var x andalso forall is_Bound xs andalso
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   532
            null (findrep xs) andalso xs = ys andalso
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   533
            (x, y) mem varpairs andalso
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   534
            is_full_cong_prems prems (varpairs \ (x, y))
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   535
          end
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   536
      | _ => false);
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   537
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   538
fun is_full_cong thm =
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   539
  let
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   540
    val prems = prems_of thm and concl = concl_of thm;
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   541
    val (lhs, rhs) = Logic.dest_equals concl;
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   542
    val (f, xs) = strip_comb lhs and (g, ys) = strip_comb rhs;
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   543
  in
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   544
    f = g andalso null (findrep (xs @ ys)) andalso length xs = length ys andalso
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   545
    is_full_cong_prems prems (xs ~~ ys)
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   546
  end;
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   547
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   548
fun add_cong (ss, thm) = ss |>
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   549
  map_simpset2 (fn (congs, procs, mk_rews, termless, subgoal_tac, loop_tacs, solvers) =>
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   550
    let
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   551
      val (lhs, _) = Drule.dest_equals (Drule.strip_imp_concl (Thm.cprop_of thm))
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   552
        handle TERM _ => raise SIMPLIFIER ("Congruence not a meta-equality", thm);
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   553
    (*val lhs = Pattern.eta_contract lhs;*)
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   554
      val a = the (cong_name (head_of (term_of lhs))) handle Library.OPTION =>
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   555
        raise SIMPLIFIER ("Congruence must start with a constant or free variable", thm);
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   556
      val (alist, weak) = congs;
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   557
      val alist2 = overwrite_warn (alist, (a, {lhs = lhs, thm = thm}))
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   558
        ("Overwriting congruence rule for " ^ quote a);
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   559
      val weak2 = if is_full_cong thm then weak else a :: weak;
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   560
    in ((alist2, weak2), procs, mk_rews, termless, subgoal_tac, loop_tacs, solvers) end);
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   561
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   562
fun del_cong (ss, thm) = ss |>
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   563
  map_simpset2 (fn (congs, procs, mk_rews, termless, subgoal_tac, loop_tacs, solvers) =>
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   564
    let
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   565
      val (lhs, _) = Logic.dest_equals (Thm.concl_of thm) handle TERM _ =>
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   566
        raise SIMPLIFIER ("Congruence not a meta-equality", thm);
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   567
    (*val lhs = Pattern.eta_contract lhs;*)
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   568
      val a = the (cong_name (head_of lhs)) handle Library.OPTION =>
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   569
        raise SIMPLIFIER ("Congruence must start with a constant", thm);
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   570
      val (alist, _) = congs;
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   571
      val alist2 = filter (fn (x, _) => x <> a) alist;
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   572
      val weak2 = alist2 |> mapfilter (fn (a, {thm, ...}) =>
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   573
        if is_full_cong thm then None else Some a);
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   574
    in ((alist2, weak2), procs, mk_rews, termless, subgoal_tac, loop_tacs, solvers) end);
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   575
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   576
fun mk_cong (Simpset (_, {mk_rews = {mk_cong = f, ...}, ...})) = f;
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   577
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   578
in
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   579
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   580
val (op addeqcongs) = foldl add_cong;
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   581
val (op deleqcongs) = foldl del_cong;
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   582
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   583
fun ss addcongs congs = ss addeqcongs map (mk_cong ss) congs;
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   584
fun ss delcongs congs = ss deleqcongs map (mk_cong ss) congs;
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   585
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   586
end;
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   587
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   588
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   589
(* simprocs *)
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   590
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   591
local
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   592
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   593
fun add_proc (ss, proc as Proc {name, lhs, ...}) =
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   594
 (trace_cterm false ("Adding simplification procedure " ^ quote name ^ " for") lhs;
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   595
  map_simpset2 (fn (congs, procs, mk_rews, termless, subgoal_tac, loop_tacs, solvers) =>
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   596
    (congs, Net.insert_term ((term_of lhs, proc), procs, eq_proc),
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   597
      mk_rews, termless, subgoal_tac, loop_tacs, solvers)) ss
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   598
  handle Net.INSERT =>
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   599
    (warning ("Ignoring duplicate simplification procedure " ^ quote name); ss));
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   600
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   601
fun del_proc (ss, proc as Proc {name, lhs, ...}) =
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   602
  map_simpset2 (fn (congs, procs, mk_rews, termless, subgoal_tac, loop_tacs, solvers) =>
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   603
    (congs, Net.delete_term ((term_of lhs, proc), procs, eq_proc),
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   604
      mk_rews, termless, subgoal_tac, loop_tacs, solvers)) ss
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   605
  handle Net.DELETE =>
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   606
    (warning ("Simplification procedure " ^ quote name ^ " not in simpset"); ss);
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   607
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   608
in
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   609
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   610
val (op addsimprocs) = foldl (fn (ss, Simproc procs) => foldl add_proc (ss, procs));
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   611
val (op delsimprocs) = foldl (fn (ss, Simproc procs) => foldl del_proc (ss, procs));
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   612
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   613
end;
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   614
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   615
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   616
(* mk_rews *)
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   617
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   618
local
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   619
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   620
fun map_mk_rews f = map_simpset2 (fn (congs, procs, {mk, mk_cong, mk_sym, mk_eq_True},
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   621
      termless, subgoal_tac, loop_tacs, solvers) =>
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   622
  let val (mk', mk_cong', mk_sym', mk_eq_True') = f (mk, mk_cong, mk_sym, mk_eq_True) in
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   623
    (congs, procs, {mk = mk', mk_cong = mk_cong', mk_sym = mk_sym', mk_eq_True = mk_eq_True'},
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   624
      termless, subgoal_tac, loop_tacs, solvers)
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   625
  end);
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   626
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   627
in
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   628
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   629
fun ss setmksimps mk = ss |> map_mk_rews (fn (_, mk_cong, mk_sym, mk_eq_True) =>
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   630
  (mk, mk_cong, mk_sym, mk_eq_True));
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   631
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   632
fun ss setmkcong mk_cong = ss |> map_mk_rews (fn (mk, _, mk_sym, mk_eq_True) =>
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   633
  (mk, mk_cong, mk_sym, mk_eq_True));
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   634
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   635
fun ss setmksym mk_sym = ss |> map_mk_rews (fn (mk, mk_cong, _, mk_eq_True) =>
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   636
  (mk, mk_cong, mk_sym, mk_eq_True));
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   637
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   638
fun ss setmkeqTrue mk_eq_True = ss |> map_mk_rews (fn (mk, mk_cong, mk_sym, _) =>
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   639
  (mk, mk_cong, mk_sym, mk_eq_True));
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   640
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   641
end;
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   642
14242
ec70653a02bf Added access to the mk_rews field (and friends).
skalberg
parents: 14040
diff changeset
   643
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   644
(* termless *)
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   645
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   646
fun ss settermless termless = ss |>
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   647
  map_simpset2 (fn (congs, procs, mk_rews, _, subgoal_tac, loop_tacs, solvers) =>
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   648
   (congs, procs, mk_rews, termless, subgoal_tac, loop_tacs, solvers));
15006
107e4dfd3b96 Merging the meta-simplifier with the Provers-simplifier. Next step:
skalberg
parents: 15001
diff changeset
   649
107e4dfd3b96 Merging the meta-simplifier with the Provers-simplifier. Next step:
skalberg
parents: 15001
diff changeset
   650
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   651
(* tactics *)
15006
107e4dfd3b96 Merging the meta-simplifier with the Provers-simplifier. Next step:
skalberg
parents: 15001
diff changeset
   652
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   653
fun ss setsubgoaler subgoal_tac = ss |>
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   654
  map_simpset2 (fn (congs, procs, mk_rews, termless, _, loop_tacs, solvers) =>
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   655
   (congs, procs, mk_rews, termless, subgoal_tac, loop_tacs, solvers));
15006
107e4dfd3b96 Merging the meta-simplifier with the Provers-simplifier. Next step:
skalberg
parents: 15001
diff changeset
   656
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   657
fun ss setloop tac = ss |>
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   658
  map_simpset2 (fn (congs, procs, mk_rews, termless, subgoal_tac, _, solvers) =>
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   659
   (congs, procs, mk_rews, termless, subgoal_tac, [("", tac)], solvers));
15006
107e4dfd3b96 Merging the meta-simplifier with the Provers-simplifier. Next step:
skalberg
parents: 15001
diff changeset
   660
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   661
fun ss addloop (name, tac) = ss |>
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   662
  map_simpset2 (fn (congs, procs, mk_rews, termless, subgoal_tac, loop_tacs, solvers) =>
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   663
    (congs, procs, mk_rews, termless, subgoal_tac,
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   664
      overwrite_warn (loop_tacs, (name, tac)) ("Overwriting looper " ^ quote name),
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   665
      solvers));
15006
107e4dfd3b96 Merging the meta-simplifier with the Provers-simplifier. Next step:
skalberg
parents: 15001
diff changeset
   666
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   667
fun ss delloop name = ss |>
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   668
  map_simpset2 (fn (congs, procs, mk_rews, termless, subgoal_tac, loop_tacs, solvers) =>
15034
e1282c4b39be improved print_ss; tuned;
wenzelm
parents: 15023
diff changeset
   669
    let val loop_tacs' = filter_out (equal name o #1) loop_tacs in
e1282c4b39be improved print_ss; tuned;
wenzelm
parents: 15023
diff changeset
   670
      if length loop_tacs <> length loop_tacs' then ()
e1282c4b39be improved print_ss; tuned;
wenzelm
parents: 15023
diff changeset
   671
      else warning ("No such looper in simpset: " ^ quote name);
e1282c4b39be improved print_ss; tuned;
wenzelm
parents: 15023
diff changeset
   672
      (congs, procs, mk_rews, termless, subgoal_tac, loop_tacs', solvers)
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   673
    end);
15006
107e4dfd3b96 Merging the meta-simplifier with the Provers-simplifier. Next step:
skalberg
parents: 15001
diff changeset
   674
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   675
fun ss setSSolver solver = ss |> map_simpset2 (fn (congs, procs, mk_rews, termless,
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   676
  subgoal_tac, loop_tacs, (unsafe_solvers, _)) =>
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   677
    (congs, procs, mk_rews, termless, subgoal_tac, loop_tacs, (unsafe_solvers, [solver])));
15006
107e4dfd3b96 Merging the meta-simplifier with the Provers-simplifier. Next step:
skalberg
parents: 15001
diff changeset
   678
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   679
fun ss addSSolver solver = ss |> map_simpset2 (fn (congs, procs, mk_rews, termless,
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   680
  subgoal_tac, loop_tacs, (unsafe_solvers, solvers)) => (congs, procs, mk_rews, termless,
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   681
    subgoal_tac, loop_tacs, (unsafe_solvers, merge_solvers solvers [solver])));
15006
107e4dfd3b96 Merging the meta-simplifier with the Provers-simplifier. Next step:
skalberg
parents: 15001
diff changeset
   682
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   683
fun ss setSolver solver = ss |> map_simpset2 (fn (congs, procs, mk_rews, termless,
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   684
  subgoal_tac, loop_tacs, (_, solvers)) => (congs, procs, mk_rews, termless,
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   685
    subgoal_tac, loop_tacs, ([solver], solvers)));
15006
107e4dfd3b96 Merging the meta-simplifier with the Provers-simplifier. Next step:
skalberg
parents: 15001
diff changeset
   686
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   687
fun ss addSolver solver = ss |> map_simpset2 (fn (congs, procs, mk_rews, termless,
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   688
  subgoal_tac, loop_tacs, (unsafe_solvers, solvers)) => (congs, procs, mk_rews, termless,
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   689
    subgoal_tac, loop_tacs, (merge_solvers unsafe_solvers [solver], solvers)));
15006
107e4dfd3b96 Merging the meta-simplifier with the Provers-simplifier. Next step:
skalberg
parents: 15001
diff changeset
   690
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   691
fun set_solvers solvers = map_simpset2 (fn (congs, procs, mk_rews, termless,
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   692
  subgoal_tac, loop_tacs, _) => (congs, procs, mk_rews, termless,
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   693
  subgoal_tac, loop_tacs, (solvers, solvers)));
15006
107e4dfd3b96 Merging the meta-simplifier with the Provers-simplifier. Next step:
skalberg
parents: 15001
diff changeset
   694
107e4dfd3b96 Merging the meta-simplifier with the Provers-simplifier. Next step:
skalberg
parents: 15001
diff changeset
   695
107e4dfd3b96 Merging the meta-simplifier with the Provers-simplifier. Next step:
skalberg
parents: 15001
diff changeset
   696
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   697
(** rewriting **)
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   698
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   699
(*
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   700
  Uses conversions, see:
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   701
    L C Paulson, A higher-order implementation of rewriting,
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   702
    Science of Computer Programming 3 (1983), pages 119-149.
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   703
*)
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   704
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   705
val dest_eq = Drule.dest_equals o Thm.cprop_of;
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   706
val lhs_of = #1 o dest_eq;
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   707
val rhs_of = #2 o dest_eq;
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   708
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   709
fun check_conv msg thm thm' =
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   710
  let
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   711
    val thm'' = transitive thm (transitive
15001
fb2141a9f8c0 Moved conversion rules from MetaSimplifier to Drule. refl_implies removed
skalberg
parents: 14981
diff changeset
   712
      (symmetric (Drule.beta_eta_conversion (lhs_of thm'))) thm')
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   713
  in if msg then trace_thm "SUCCEEDED" thm' else (); Some thm'' end
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   714
  handle THM _ =>
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   715
    let val {sign, prop = _ $ _ $ prop0, ...} = Thm.rep_thm thm in
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   716
      trace_thm "Proved wrong thm (Check subgoaler?)" thm';
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   717
      trace_term false "Should have proved:" sign prop0;
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   718
      None
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   719
    end;
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   720
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   721
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   722
(* mk_procrule *)
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   723
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   724
fun mk_procrule thm =
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   725
  let val (_, prems, lhs, elhs, rhs, _) = decomp_simp thm in
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   726
    if rewrite_rule_extra_vars prems lhs rhs
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   727
    then (warn_thm "Extra vars on rhs:" thm; [])
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   728
    else [mk_rrule2 {thm = thm, name = "", lhs = lhs, elhs = elhs, perm = false}]
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   729
  end;
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   730
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   731
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   732
(* rewritec: conversion to apply the meta simpset to a term *)
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   733
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   734
(*Since the rewriting strategy is bottom-up, we avoid re-normalizing already
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   735
  normalized terms by carrying around the rhs of the rewrite rule just
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   736
  applied. This is called the `skeleton'. It is decomposed in parallel
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   737
  with the term. Once a Var is encountered, the corresponding term is
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   738
  already in normal form.
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   739
  skel0 is a dummy skeleton that is to enforce complete normalization.*)
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   740
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   741
val skel0 = Bound 0;
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   742
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   743
(*Use rhs as skeleton only if the lhs does not contain unnormalized bits.
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   744
  The latter may happen iff there are weak congruence rules for constants
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   745
  in the lhs.*)
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   746
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   747
fun uncond_skel ((_, weak), (lhs, rhs)) =
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   748
  if null weak then rhs  (*optimization*)
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   749
  else if exists_Const (fn (c, _) => c mem weak) lhs then skel0
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   750
  else rhs;
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   751
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   752
(*Behaves like unconditional rule if rhs does not contain vars not in the lhs.
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   753
  Otherwise those vars may become instantiated with unnormalized terms
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   754
  while the premises are solved.*)
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   755
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   756
fun cond_skel (args as (congs, (lhs, rhs))) =
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   757
  if term_varnames rhs subset term_varnames lhs then uncond_skel args
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   758
  else skel0;
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   759
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   760
fun incr_depth ss =
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   761
  let
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   762
    val ss' = ss |> map_simpset1 (fn (rules, prems, bounds, depth) =>
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   763
      (rules, prems, bounds, depth + 1));
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   764
    val Simpset ({depth = depth', ...}, _) = ss';
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   765
  in
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   766
    if depth' > ! simp_depth_limit
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   767
    then (warning "simp_depth_limit exceeded - giving up"; None)
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   768
    else
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   769
     (if depth' mod 10 = 0
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   770
      then warning ("Simplification depth " ^ string_of_int depth')
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   771
      else ();
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   772
      Some ss')
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   773
  end;
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   774
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   775
(*
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   776
  Rewriting -- we try in order:
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   777
    (1) beta reduction
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   778
    (2) unconditional rewrite rules
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   779
    (3) conditional rewrite rules
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   780
    (4) simplification procedures
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   781
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   782
  IMPORTANT: rewrite rules must not introduce new Vars or TVars!
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   783
*)
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   784
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   785
fun rewritec (prover, signt, maxt) ss t =
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   786
  let
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   787
    val Simpset ({rules, ...}, {congs, procs, termless, ...}) = ss;
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   788
    val eta_thm = Thm.eta_conversion t;
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   789
    val eta_t' = rhs_of eta_thm;
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   790
    val eta_t = term_of eta_t';
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   791
    val tsigt = Sign.tsig_of signt;
13607
6908230623a3 Completely reimplemented mutual simplification of premises.
berghofe
parents: 13569
diff changeset
   792
    fun rew {thm, name, lhs, elhs, fo, perm} =
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   793
      let
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   794
        val {sign, prop, maxidx, ...} = rep_thm thm;
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   795
        val _ = if Sign.subsig (sign, signt) then ()
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   796
                else (warn_thm "Ignoring rewrite rule from different theory:" thm;
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   797
                      raise Pattern.MATCH);
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   798
        val (rthm, elhs') = if maxt = ~1 then (thm, elhs)
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   799
          else (Thm.incr_indexes (maxt+1) thm, Thm.cterm_incr_indexes (maxt+1) elhs);
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   800
        val insts = if fo then Thm.cterm_first_order_match (elhs', eta_t')
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   801
                          else Thm.cterm_match (elhs', eta_t');
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   802
        val thm' = Thm.instantiate insts (Thm.rename_boundvars lhs eta_t rthm);
14643
wenzelm
parents: 14330
diff changeset
   803
        val prop' = Thm.prop_of thm';
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   804
        val unconditional = (Logic.count_prems (prop',0) = 0);
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   805
        val (lhs', rhs') = Logic.dest_equals (Logic.strip_imp_concl prop')
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   806
      in
11295
66925f23ac7f improved tracing of permutative rules.
nipkow
parents: 11291
diff changeset
   807
        if perm andalso not (termless (rhs', lhs'))
13607
6908230623a3 Completely reimplemented mutual simplification of premises.
berghofe
parents: 13569
diff changeset
   808
        then (trace_named_thm "Cannot apply permutative rewrite rule" (thm, name);
13569
69a6b3aa0f38 drule: added nRS
nipkow
parents: 13486
diff changeset
   809
              trace_thm "Term does not become smaller:" thm'; None)
13607
6908230623a3 Completely reimplemented mutual simplification of premises.
berghofe
parents: 13569
diff changeset
   810
        else (trace_named_thm "Applying instance of rewrite rule" (thm, name);
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   811
           if unconditional
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   812
           then
13569
69a6b3aa0f38 drule: added nRS
nipkow
parents: 13486
diff changeset
   813
             (trace_thm "Rewriting:" thm';
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   814
              let val lr = Logic.dest_equals prop;
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   815
                  val Some thm'' = check_conv false eta_thm thm'
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   816
              in Some (thm'', uncond_skel (congs, lr)) end)
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   817
           else
13569
69a6b3aa0f38 drule: added nRS
nipkow
parents: 13486
diff changeset
   818
             (trace_thm "Trying to rewrite:" thm';
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   819
              case incr_depth ss of
13828
fb6ec40dd291 added simp_depth_limit
nipkow
parents: 13661
diff changeset
   820
                None => (trace_thm "FAILED - reached depth limit" thm'; None)
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   821
              | Some ss' =>
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   822
              (case prover ss' thm' of
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   823
                None => (trace_thm "FAILED" thm'; None)
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   824
              | Some thm2 =>
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   825
                  (case check_conv true eta_thm thm2 of
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   826
                     None => None |
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   827
                     Some thm2' =>
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   828
                       let val concl = Logic.strip_imp_concl prop
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   829
                           val lr = Logic.dest_equals concl
13828
fb6ec40dd291 added simp_depth_limit
nipkow
parents: 13661
diff changeset
   830
                       in Some (thm2', cond_skel (congs, lr)) end))))
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   831
      end
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   832
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   833
    fun rews [] = None
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   834
      | rews (rrule :: rrules) =
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   835
          let val opt = rew rrule handle Pattern.MATCH => None
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   836
          in case opt of None => rews rrules | some => some end;
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   837
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   838
    fun sort_rrules rrs = let
14643
wenzelm
parents: 14330
diff changeset
   839
      fun is_simple({thm, ...}:rrule) = case Thm.prop_of thm of
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   840
                                      Const("==",_) $ _ $ _ => true
12603
7d2bca103101 tuned tracing markup;
wenzelm
parents: 12285
diff changeset
   841
                                      | _                   => false
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   842
      fun sort []        (re1,re2) = re1 @ re2
12603
7d2bca103101 tuned tracing markup;
wenzelm
parents: 12285
diff changeset
   843
        | sort (rr::rrs) (re1,re2) = if is_simple rr
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   844
                                     then sort rrs (rr::re1,re2)
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   845
                                     else sort rrs (re1,rr::re2)
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   846
    in sort rrs ([],[]) end
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   847
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   848
    fun proc_rews [] = None
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   849
      | proc_rews (Proc {name, proc, lhs, ...} :: ps) =
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   850
          if Pattern.matches tsigt (Thm.term_of lhs, Thm.term_of t) then
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   851
            (debug_term false ("Trying procedure " ^ quote name ^ " on:") signt eta_t;
13486
54464ea94d6f exception SIMPROC_FAIL: solid error reporting of simprocs;
wenzelm
parents: 13458
diff changeset
   852
             case transform_failure (curry SIMPROC_FAIL name)
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   853
                 (fn () => proc signt ss eta_t) () of
13486
54464ea94d6f exception SIMPROC_FAIL: solid error reporting of simprocs;
wenzelm
parents: 13458
diff changeset
   854
               None => (debug false "FAILED"; proc_rews ps)
54464ea94d6f exception SIMPROC_FAIL: solid error reporting of simprocs;
wenzelm
parents: 13458
diff changeset
   855
             | Some raw_thm =>
13569
69a6b3aa0f38 drule: added nRS
nipkow
parents: 13486
diff changeset
   856
                 (trace_thm ("Procedure " ^ quote name ^ " produced rewrite rule:") raw_thm;
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   857
                  (case rews (mk_procrule raw_thm) of
13486
54464ea94d6f exception SIMPROC_FAIL: solid error reporting of simprocs;
wenzelm
parents: 13458
diff changeset
   858
                    None => (trace_cterm true ("IGNORED result of simproc " ^ quote name ^
54464ea94d6f exception SIMPROC_FAIL: solid error reporting of simprocs;
wenzelm
parents: 13458
diff changeset
   859
                      " -- does not match") t; proc_rews ps)
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   860
                  | some => some)))
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   861
          else proc_rews ps;
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   862
  in case eta_t of
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   863
       Abs _ $ _ => Some (transitive eta_thm
12155
13c5469b4bb3 congc now returns None if congruence rule has no effect.
berghofe
parents: 11886
diff changeset
   864
         (beta_conversion false eta_t'), skel0)
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   865
     | _ => (case rews (sort_rrules (Net.match_term rules eta_t)) of
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   866
               None => proc_rews (Net.match_term procs eta_t)
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   867
             | some => some)
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   868
  end;
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   869
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   870
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   871
(* conversion to apply a congruence rule to a term *)
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   872
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   873
fun congc (prover,signt,maxt) {thm=cong,lhs=lhs} t =
14643
wenzelm
parents: 14330
diff changeset
   874
  let val sign = Thm.sign_of_thm cong
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   875
      val _ = if Sign.subsig (sign, signt) then ()
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   876
                 else error("Congruence rule from different theory")
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   877
      val rthm = if maxt = ~1 then cong else Thm.incr_indexes (maxt+1) cong;
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   878
      val rlhs = fst (Drule.dest_equals (Drule.strip_imp_concl (cprop_of rthm)));
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   879
      val insts = Thm.cterm_match (rlhs, t)
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   880
      (* Pattern.match can raise Pattern.MATCH;
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   881
         is handled when congc is called *)
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   882
      val thm' = Thm.instantiate insts (Thm.rename_boundvars (term_of rlhs) (term_of t) rthm);
13569
69a6b3aa0f38 drule: added nRS
nipkow
parents: 13486
diff changeset
   883
      val unit = trace_thm "Applying congruence rule:" thm';
13932
0eb3d91b519a Simplifier no longer aborts on failed congruence proof.
ballarin
parents: 13835
diff changeset
   884
      fun err (msg, thm) = (trace_thm msg thm; None)
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   885
  in case prover thm' of
13932
0eb3d91b519a Simplifier no longer aborts on failed congruence proof.
ballarin
parents: 13835
diff changeset
   886
       None => err ("Congruence proof failed.  Could not prove", thm')
15001
fb2141a9f8c0 Moved conversion rules from MetaSimplifier to Drule. refl_implies removed
skalberg
parents: 14981
diff changeset
   887
     | Some thm2 => (case check_conv true (Drule.beta_eta_conversion t) thm2 of
13932
0eb3d91b519a Simplifier no longer aborts on failed congruence proof.
ballarin
parents: 13835
diff changeset
   888
          None => err ("Congruence proof failed.  Should not have proved", thm2)
12155
13c5469b4bb3 congc now returns None if congruence rule has no effect.
berghofe
parents: 11886
diff changeset
   889
        | Some thm2' =>
13c5469b4bb3 congc now returns None if congruence rule has no effect.
berghofe
parents: 11886
diff changeset
   890
            if op aconv (pairself term_of (dest_equals (cprop_of thm2')))
13c5469b4bb3 congc now returns None if congruence rule has no effect.
berghofe
parents: 11886
diff changeset
   891
            then None else Some thm2')
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   892
  end;
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   893
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   894
val (cA, (cB, cC)) =
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   895
  apsnd dest_equals (dest_implies (hd (cprems_of Drule.imp_cong)));
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   896
13607
6908230623a3 Completely reimplemented mutual simplification of premises.
berghofe
parents: 13569
diff changeset
   897
fun transitive1 None None = None
6908230623a3 Completely reimplemented mutual simplification of premises.
berghofe
parents: 13569
diff changeset
   898
  | transitive1 (Some thm1) None = Some thm1
6908230623a3 Completely reimplemented mutual simplification of premises.
berghofe
parents: 13569
diff changeset
   899
  | transitive1 None (Some thm2) = Some thm2
6908230623a3 Completely reimplemented mutual simplification of premises.
berghofe
parents: 13569
diff changeset
   900
  | transitive1 (Some thm1) (Some thm2) = Some (transitive thm1 thm2)
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   901
13607
6908230623a3 Completely reimplemented mutual simplification of premises.
berghofe
parents: 13569
diff changeset
   902
fun transitive2 thm = transitive1 (Some thm);
6908230623a3 Completely reimplemented mutual simplification of premises.
berghofe
parents: 13569
diff changeset
   903
fun transitive3 thm = transitive1 thm o Some;
6908230623a3 Completely reimplemented mutual simplification of premises.
berghofe
parents: 13569
diff changeset
   904
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   905
fun bottomc ((simprem, useprem, mutsimp), prover, sign, maxidx) =
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   906
  let
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   907
    fun botc skel ss t =
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   908
          if is_Var skel then None
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   909
          else
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   910
          (case subc skel ss t of
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   911
             some as Some thm1 =>
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   912
               (case rewritec (prover, sign, maxidx) ss (rhs_of thm1) of
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   913
                  Some (thm2, skel2) =>
13607
6908230623a3 Completely reimplemented mutual simplification of premises.
berghofe
parents: 13569
diff changeset
   914
                    transitive2 (transitive thm1 thm2)
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   915
                      (botc skel2 ss (rhs_of thm2))
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   916
                | None => some)
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   917
           | None =>
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   918
               (case rewritec (prover, sign, maxidx) ss t of
13607
6908230623a3 Completely reimplemented mutual simplification of premises.
berghofe
parents: 13569
diff changeset
   919
                  Some (thm2, skel2) => transitive2 thm2
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   920
                    (botc skel2 ss (rhs_of thm2))
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   921
                | None => None))
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   922
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   923
    and try_botc ss t =
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   924
          (case botc skel0 ss t of
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   925
             Some trec1 => trec1 | None => (reflexive t))
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   926
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   927
    and subc skel (ss as Simpset ({bounds, ...}, {congs, ...})) t0 =
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   928
       (case term_of t0 of
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   929
           Abs (a, T, t) =>
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   930
             let
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   931
                 val b = variant bounds a;
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   932
                 val (v, t') = Thm.dest_abs (Some ("." ^ b)) t0;
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   933
                 val ss' = add_bound b ss;
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   934
                 val skel' = case skel of Abs (_, _, sk) => sk | _ => skel0;
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   935
             in case botc skel' ss' t' of
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   936
                  Some thm => Some (abstract_rule a v thm)
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   937
                | None => None
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   938
             end
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   939
         | t $ _ => (case t of
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   940
             Const ("==>", _) $ _  => impc t0 ss
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   941
           | Abs _ =>
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   942
               let val thm = beta_conversion false t0
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   943
               in case subc skel0 ss (rhs_of thm) of
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   944
                    None => Some thm
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   945
                  | Some thm' => Some (transitive thm thm')
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   946
               end
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   947
           | _  =>
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   948
               let fun appc () =
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   949
                     let
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   950
                       val (tskel, uskel) = case skel of
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   951
                           tskel $ uskel => (tskel, uskel)
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   952
                         | _ => (skel0, skel0);
10767
8fa4aafa7314 Thm: dest_comb, dest_abs, capply, cabs no longer global;
wenzelm
parents: 10413
diff changeset
   953
                       val (ct, cu) = Thm.dest_comb t0
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   954
                     in
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   955
                     (case botc tskel ss ct of
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   956
                        Some thm1 =>
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   957
                          (case botc uskel ss cu of
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   958
                             Some thm2 => Some (combination thm1 thm2)
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   959
                           | None => Some (combination thm1 (reflexive cu)))
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   960
                      | None =>
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   961
                          (case botc uskel ss cu of
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   962
                             Some thm1 => Some (combination (reflexive ct) thm1)
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   963
                           | None => None))
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   964
                     end
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   965
                   val (h, ts) = strip_comb t
13835
12b2ffbe543a Change to meta simplifier: congruence rules may now have frees as head of term.
ballarin
parents: 13828
diff changeset
   966
               in case cong_name h of
12b2ffbe543a Change to meta simplifier: congruence rules may now have frees as head of term.
ballarin
parents: 13828
diff changeset
   967
                    Some a =>
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   968
                      (case assoc_string (fst congs, a) of
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   969
                         None => appc ()
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   970
                       | Some cong =>
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   971
  (*post processing: some partial applications h t1 ... tj, j <= length ts,
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   972
    may be a redex. Example: map (%x. x) = (%xs. xs) wrt map_cong*)
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   973
                          (let
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   974
                             val thm = congc (prover ss, sign, maxidx) cong t0;
12155
13c5469b4bb3 congc now returns None if congruence rule has no effect.
berghofe
parents: 11886
diff changeset
   975
                             val t = if_none (apsome rhs_of thm) t0;
10767
8fa4aafa7314 Thm: dest_comb, dest_abs, capply, cabs no longer global;
wenzelm
parents: 10413
diff changeset
   976
                             val (cl, cr) = Thm.dest_comb t
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   977
                             val dVar = Var(("", 0), dummyT)
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   978
                             val skel =
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   979
                               list_comb (h, replicate (length ts) dVar)
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   980
                           in case botc skel ss cl of
12155
13c5469b4bb3 congc now returns None if congruence rule has no effect.
berghofe
parents: 11886
diff changeset
   981
                                None => thm
13607
6908230623a3 Completely reimplemented mutual simplification of premises.
berghofe
parents: 13569
diff changeset
   982
                              | Some thm' => transitive3 thm
12155
13c5469b4bb3 congc now returns None if congruence rule has no effect.
berghofe
parents: 11886
diff changeset
   983
                                  (combination thm' (reflexive cr))
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   984
                           end handle TERM _ => error "congc result"
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   985
                                    | Pattern.MATCH => appc ()))
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   986
                  | _ => appc ()
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   987
               end)
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   988
         | _ => None)
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   989
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   990
    and impc ct ss =
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   991
      if mutsimp then mut_impc0 [] ct [] [] ss else nonmut_impc ct ss
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
   992
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   993
    and rules_of_prem ss prem =
13607
6908230623a3 Completely reimplemented mutual simplification of premises.
berghofe
parents: 13569
diff changeset
   994
      if maxidx_of_term (term_of prem) <> ~1
6908230623a3 Completely reimplemented mutual simplification of premises.
berghofe
parents: 13569
diff changeset
   995
      then (trace_cterm true
6908230623a3 Completely reimplemented mutual simplification of premises.
berghofe
parents: 13569
diff changeset
   996
        "Cannot add premise as rewrite rule because it contains (type) unknowns:" prem; ([], None))
6908230623a3 Completely reimplemented mutual simplification of premises.
berghofe
parents: 13569
diff changeset
   997
      else
6908230623a3 Completely reimplemented mutual simplification of premises.
berghofe
parents: 13569
diff changeset
   998
        let val asm = assume prem
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
   999
        in (extract_safe_rrules (ss, asm), Some asm) end
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
  1000
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
  1001
    and add_rrules (rrss, asms) ss =
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
  1002
      foldl (insert_rrule true) (ss, flat rrss) |> add_prems (mapfilter I asms)
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
  1003
13607
6908230623a3 Completely reimplemented mutual simplification of premises.
berghofe
parents: 13569
diff changeset
  1004
    and disch r (prem, eq) =
6908230623a3 Completely reimplemented mutual simplification of premises.
berghofe
parents: 13569
diff changeset
  1005
      let
6908230623a3 Completely reimplemented mutual simplification of premises.
berghofe
parents: 13569
diff changeset
  1006
        val (lhs, rhs) = dest_eq eq;
6908230623a3 Completely reimplemented mutual simplification of premises.
berghofe
parents: 13569
diff changeset
  1007
        val eq' = implies_elim (Thm.instantiate
6908230623a3 Completely reimplemented mutual simplification of premises.
berghofe
parents: 13569
diff changeset
  1008
          ([], [(cA, prem), (cB, lhs), (cC, rhs)]) Drule.imp_cong)
6908230623a3 Completely reimplemented mutual simplification of premises.
berghofe
parents: 13569
diff changeset
  1009
          (implies_intr prem eq)
6908230623a3 Completely reimplemented mutual simplification of premises.
berghofe
parents: 13569
diff changeset
  1010
      in if not r then eq' else
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
  1011
        let
13607
6908230623a3 Completely reimplemented mutual simplification of premises.
berghofe
parents: 13569
diff changeset
  1012
          val (prem', concl) = dest_implies lhs;
6908230623a3 Completely reimplemented mutual simplification of premises.
berghofe
parents: 13569
diff changeset
  1013
          val (prem'', _) = dest_implies rhs
6908230623a3 Completely reimplemented mutual simplification of premises.
berghofe
parents: 13569
diff changeset
  1014
        in transitive (transitive
6908230623a3 Completely reimplemented mutual simplification of premises.
berghofe
parents: 13569
diff changeset
  1015
          (Thm.instantiate ([], [(cA, prem'), (cB, prem), (cC, concl)])
6908230623a3 Completely reimplemented mutual simplification of premises.
berghofe
parents: 13569
diff changeset
  1016
             Drule.swap_prems_eq) eq')
6908230623a3 Completely reimplemented mutual simplification of premises.
berghofe
parents: 13569
diff changeset
  1017
          (Thm.instantiate ([], [(cA, prem), (cB, prem''), (cC, concl)])
6908230623a3 Completely reimplemented mutual simplification of premises.
berghofe
parents: 13569
diff changeset
  1018
             Drule.swap_prems_eq)
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
  1019
        end
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
  1020
      end
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
  1021
13607
6908230623a3 Completely reimplemented mutual simplification of premises.
berghofe
parents: 13569
diff changeset
  1022
    and rebuild [] _ _ _ _ eq = eq
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
  1023
      | rebuild (prem :: prems) concl (rrs :: rrss) (asm :: asms) ss eq =
13607
6908230623a3 Completely reimplemented mutual simplification of premises.
berghofe
parents: 13569
diff changeset
  1024
          let
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
  1025
            val ss' = add_rrules (rev rrss, rev asms) ss;
13607
6908230623a3 Completely reimplemented mutual simplification of premises.
berghofe
parents: 13569
diff changeset
  1026
            val concl' =
6908230623a3 Completely reimplemented mutual simplification of premises.
berghofe
parents: 13569
diff changeset
  1027
              Drule.mk_implies (prem, if_none (apsome rhs_of eq) concl);
6908230623a3 Completely reimplemented mutual simplification of premises.
berghofe
parents: 13569
diff changeset
  1028
            val dprem = apsome (curry (disch false) prem)
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
  1029
          in case rewritec (prover, sign, maxidx) ss' concl' of
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
  1030
              None => rebuild prems concl' rrss asms ss (dprem eq)
13607
6908230623a3 Completely reimplemented mutual simplification of premises.
berghofe
parents: 13569
diff changeset
  1031
            | Some (eq', _) => transitive2 (foldl (disch false o swap)
6908230623a3 Completely reimplemented mutual simplification of premises.
berghofe
parents: 13569
diff changeset
  1032
                  (the (transitive3 (dprem eq) eq'), prems))
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
  1033
                (mut_impc0 (rev prems) (rhs_of eq') (rev rrss) (rev asms) ss)
13607
6908230623a3 Completely reimplemented mutual simplification of premises.
berghofe
parents: 13569
diff changeset
  1034
          end
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
  1035
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
  1036
    and mut_impc0 prems concl rrss asms ss =
13607
6908230623a3 Completely reimplemented mutual simplification of premises.
berghofe
parents: 13569
diff changeset
  1037
      let
6908230623a3 Completely reimplemented mutual simplification of premises.
berghofe
parents: 13569
diff changeset
  1038
        val prems' = strip_imp_prems concl;
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
  1039
        val (rrss', asms') = split_list (map (rules_of_prem ss) prems')
13607
6908230623a3 Completely reimplemented mutual simplification of premises.
berghofe
parents: 13569
diff changeset
  1040
      in mut_impc (prems @ prems') (strip_imp_concl concl) (rrss @ rrss')
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
  1041
        (asms @ asms') [] [] [] [] ss ~1 ~1
13607
6908230623a3 Completely reimplemented mutual simplification of premises.
berghofe
parents: 13569
diff changeset
  1042
      end
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
  1043
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
  1044
    and mut_impc [] concl [] [] prems' rrss' asms' eqns ss changed k =
13607
6908230623a3 Completely reimplemented mutual simplification of premises.
berghofe
parents: 13569
diff changeset
  1045
        transitive1 (foldl (fn (eq2, (eq1, prem)) => transitive1 eq1
6908230623a3 Completely reimplemented mutual simplification of premises.
berghofe
parents: 13569
diff changeset
  1046
            (apsome (curry (disch false) prem) eq2)) (None, eqns ~~ prems'))
6908230623a3 Completely reimplemented mutual simplification of premises.
berghofe
parents: 13569
diff changeset
  1047
          (if changed > 0 then
6908230623a3 Completely reimplemented mutual simplification of premises.
berghofe
parents: 13569
diff changeset
  1048
             mut_impc (rev prems') concl (rev rrss') (rev asms')
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
  1049
               [] [] [] [] ss ~1 changed
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
  1050
           else rebuild prems' concl rrss' asms' ss
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
  1051
             (botc skel0 (add_rrules (rev rrss', rev asms') ss) concl))
13607
6908230623a3 Completely reimplemented mutual simplification of premises.
berghofe
parents: 13569
diff changeset
  1052
6908230623a3 Completely reimplemented mutual simplification of premises.
berghofe
parents: 13569
diff changeset
  1053
      | mut_impc (prem :: prems) concl (rrs :: rrss) (asm :: asms)
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
  1054
          prems' rrss' asms' eqns ss changed k =
13607
6908230623a3 Completely reimplemented mutual simplification of premises.
berghofe
parents: 13569
diff changeset
  1055
        case (if k = 0 then None else botc skel0 (add_rrules
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
  1056
          (rev rrss' @ rrss, rev asms' @ asms) ss) prem) of
13607
6908230623a3 Completely reimplemented mutual simplification of premises.
berghofe
parents: 13569
diff changeset
  1057
            None => mut_impc prems concl rrss asms (prem :: prems')
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
  1058
              (rrs :: rrss') (asm :: asms') (None :: eqns) ss changed
13607
6908230623a3 Completely reimplemented mutual simplification of premises.
berghofe
parents: 13569
diff changeset
  1059
              (if k = 0 then 0 else k - 1)
6908230623a3 Completely reimplemented mutual simplification of premises.
berghofe
parents: 13569
diff changeset
  1060
          | Some eqn =>
6908230623a3 Completely reimplemented mutual simplification of premises.
berghofe
parents: 13569
diff changeset
  1061
            let
6908230623a3 Completely reimplemented mutual simplification of premises.
berghofe
parents: 13569
diff changeset
  1062
              val prem' = rhs_of eqn;
6908230623a3 Completely reimplemented mutual simplification of premises.
berghofe
parents: 13569
diff changeset
  1063
              val tprems = map term_of prems;
6908230623a3 Completely reimplemented mutual simplification of premises.
berghofe
parents: 13569
diff changeset
  1064
              val i = 1 + foldl Int.max (~1, map (fn p =>
6908230623a3 Completely reimplemented mutual simplification of premises.
berghofe
parents: 13569
diff changeset
  1065
                find_index_eq p tprems) (#hyps (rep_thm eqn)));
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
  1066
              val (rrs', asm') = rules_of_prem ss prem'
13607
6908230623a3 Completely reimplemented mutual simplification of premises.
berghofe
parents: 13569
diff changeset
  1067
            in mut_impc prems concl rrss asms (prem' :: prems')
6908230623a3 Completely reimplemented mutual simplification of premises.
berghofe
parents: 13569
diff changeset
  1068
              (rrs' :: rrss') (asm' :: asms') (Some (foldr (disch true)
15001
fb2141a9f8c0 Moved conversion rules from MetaSimplifier to Drule. refl_implies removed
skalberg
parents: 14981
diff changeset
  1069
                (take (i, prems), Drule.imp_cong' eqn (reflexive (Drule.list_implies
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
  1070
                  (drop (i, prems), concl))))) :: eqns) ss (length prems') ~1
13607
6908230623a3 Completely reimplemented mutual simplification of premises.
berghofe
parents: 13569
diff changeset
  1071
            end
6908230623a3 Completely reimplemented mutual simplification of premises.
berghofe
parents: 13569
diff changeset
  1072
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
  1073
     (*legacy code - only for backwards compatibility*)
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
  1074
     and nonmut_impc ct ss =
13607
6908230623a3 Completely reimplemented mutual simplification of premises.
berghofe
parents: 13569
diff changeset
  1075
       let val (prem, conc) = dest_implies ct;
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
  1076
           val thm1 = if simprem then botc skel0 ss prem else None;
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
  1077
           val prem1 = if_none (apsome rhs_of thm1) prem;
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
  1078
           val ss1 = if not useprem then ss else add_rrules
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
  1079
             (apsnd single (apfst single (rules_of_prem ss prem1))) ss
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
  1080
       in (case botc skel0 ss1 conc of
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
  1081
           None => (case thm1 of
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
  1082
               None => None
15001
fb2141a9f8c0 Moved conversion rules from MetaSimplifier to Drule. refl_implies removed
skalberg
parents: 14981
diff changeset
  1083
             | Some thm1' => Some (Drule.imp_cong' thm1' (reflexive conc)))
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
  1084
         | Some thm2 =>
13607
6908230623a3 Completely reimplemented mutual simplification of premises.
berghofe
parents: 13569
diff changeset
  1085
           let val thm2' = disch false (prem1, thm2)
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
  1086
           in (case thm1 of
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
  1087
               None => Some thm2'
13607
6908230623a3 Completely reimplemented mutual simplification of premises.
berghofe
parents: 13569
diff changeset
  1088
             | Some thm1' =>
15001
fb2141a9f8c0 Moved conversion rules from MetaSimplifier to Drule. refl_implies removed
skalberg
parents: 14981
diff changeset
  1089
                 Some (transitive (Drule.imp_cong' thm1' (reflexive conc)) thm2'))
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
  1090
           end)
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
  1091
       end
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
  1092
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
  1093
 in try_botc end;
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
  1094
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
  1095
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
  1096
(* Meta-rewriting: rewrites t to u and returns the theorem t==u *)
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
  1097
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
  1098
(*
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
  1099
  Parameters:
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
  1100
    mode = (simplify A,
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
  1101
            use A in simplifying B,
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
  1102
            use prems of B (if B is again a meta-impl.) to simplify A)
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
  1103
           when simplifying A ==> B
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
  1104
    prover: how to solve premises in conditional rewrites and congruences
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
  1105
*)
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
  1106
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
  1107
fun rewrite_cterm mode prover ss ct =
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
  1108
  let
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
  1109
    val Simpset ({depth, ...}, _) = ss;
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
  1110
    val {sign, t, maxidx, ...} = Thm.rep_cterm ct;
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
  1111
  in
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
  1112
    trace_cterm false "SIMPLIFIER INVOKED ON THE FOLLOWING TERM:" ct;
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
  1113
    simp_depth := depth;
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
  1114
    bottomc (mode, prover, sign, maxidx) ss ct
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
  1115
  end handle THM (s, _, thms) =>
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
  1116
    error ("Exception THM was raised in simplifier:\n" ^ s ^ "\n" ^
11886
36d0585f87de Display.pretty_thms;
wenzelm
parents: 11767
diff changeset
  1117
      Pretty.string_of (Display.pretty_thms thms));
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
  1118
11760
wenzelm
parents: 11737
diff changeset
  1119
(*Rewrite a cterm*)
11767
7380c9d45626 tuned rewrite/simplify interface;
wenzelm
parents: 11760
diff changeset
  1120
fun rewrite_aux _ _ [] = (fn ct => Thm.reflexive ct)
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
  1121
  | rewrite_aux prover full thms =
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
  1122
      rewrite_cterm (full, false, false) prover (empty_ss addsimps thms);
11672
8e75b78f33f3 full_rewrite_cterm_aux (see also tactic.ML);
wenzelm
parents: 11505
diff changeset
  1123
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
  1124
(*Rewrite a theorem*)
11767
7380c9d45626 tuned rewrite/simplify interface;
wenzelm
parents: 11760
diff changeset
  1125
fun simplify_aux _ _ [] = (fn th => th)
7380c9d45626 tuned rewrite/simplify interface;
wenzelm
parents: 11760
diff changeset
  1126
  | simplify_aux prover full thms =
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
  1127
      Drule.fconv_rule (rewrite_cterm (full, false, false) prover (empty_ss addsimps thms));
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
  1128
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
  1129
(*simple term rewriting -- no proof*)
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
  1130
fun rewrite_term sg rules procs =
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
  1131
  Pattern.rewrite_term (Sign.tsig_of sg) (map decomp_simp' rules) procs;
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
  1132
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
  1133
fun rewrite_thm mode prover ss = Drule.fconv_rule (rewrite_cterm mode prover ss);
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
  1134
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
  1135
(*Rewrite the subgoals of a proof state (represented by a theorem) *)
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
  1136
fun rewrite_goals_rule_aux _ []   th = th
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
  1137
  | rewrite_goals_rule_aux prover thms th =
15001
fb2141a9f8c0 Moved conversion rules from MetaSimplifier to Drule. refl_implies removed
skalberg
parents: 14981
diff changeset
  1138
      Drule.fconv_rule (Drule.goals_conv (K true) (rewrite_cterm (true, true, false) prover
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
  1139
        (empty_ss addsimps thms))) th;
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
  1140
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
  1141
(*Rewrite the subgoal of a proof state (represented by a theorem)*)
15011
35be762f58f9 Made simplification procedures simpset-aware.
skalberg
parents: 15006
diff changeset
  1142
fun rewrite_goal_rule mode prover ss i thm =
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
  1143
  if 0 < i  andalso  i <= nprems_of thm
15011
35be762f58f9 Made simplification procedures simpset-aware.
skalberg
parents: 15006
diff changeset
  1144
  then Drule.fconv_rule (Drule.goals_conv (fn j => j=i) (rewrite_cterm mode prover ss)) thm
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
  1145
  else raise THM("rewrite_goal_rule",i,[thm]);
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
  1146
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
  1147
(*Rewrite subgoal i only.  SELECT_GOAL avoids inefficiencies in goals_conv.*)
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
  1148
fun asm_rewrite_goal_tac mode prover_tac ss =
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
  1149
  SELECT_GOAL
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
  1150
    (PRIMITIVE (rewrite_goal_rule mode (SINGLE o prover_tac) ss 1));
12783
36ca5ea8092c interface to Pattern.rewrite_term;
wenzelm
parents: 12779
diff changeset
  1151
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
  1152
15006
107e4dfd3b96 Merging the meta-simplifier with the Provers-simplifier. Next step:
skalberg
parents: 15001
diff changeset
  1153
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
  1154
(** simplification tactics and rules **)
15006
107e4dfd3b96 Merging the meta-simplifier with the Provers-simplifier. Next step:
skalberg
parents: 15001
diff changeset
  1155
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
  1156
fun solve_all_tac solvers ss =
15006
107e4dfd3b96 Merging the meta-simplifier with the Provers-simplifier. Next step:
skalberg
parents: 15001
diff changeset
  1157
  let
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
  1158
    val Simpset (_, {subgoal_tac, ...}) = ss;
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
  1159
    val solve_tac = subgoal_tac (set_solvers solvers ss) THEN_ALL_NEW (K no_tac);
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
  1160
  in DEPTH_SOLVE (solve_tac 1) end;
15006
107e4dfd3b96 Merging the meta-simplifier with the Provers-simplifier. Next step:
skalberg
parents: 15001
diff changeset
  1161
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
  1162
(*NOTE: may instantiate unknowns that appear also in other subgoals*)
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
  1163
fun generic_simp_tac safe mode ss =
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
  1164
  let
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
  1165
    val Simpset ({prems, ...}, {loop_tacs, solvers = (unsafe_solvers, solvers), ...}) = ss;
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
  1166
    val loop_tac = FIRST' (map #2 loop_tacs);
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
  1167
    val solve_tac = FIRST' (map (solver prems) (if safe then solvers else unsafe_solvers));
15006
107e4dfd3b96 Merging the meta-simplifier with the Provers-simplifier. Next step:
skalberg
parents: 15001
diff changeset
  1168
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
  1169
    fun simp_loop_tac i =
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
  1170
      asm_rewrite_goal_tac mode (solve_all_tac unsafe_solvers) ss i THEN
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
  1171
      (solve_tac i ORELSE TRY ((loop_tac THEN_ALL_NEW simp_loop_tac) i));
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
  1172
  in simp_loop_tac end;
15006
107e4dfd3b96 Merging the meta-simplifier with the Provers-simplifier. Next step:
skalberg
parents: 15001
diff changeset
  1173
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
  1174
fun simp rew mode ss thm =
15006
107e4dfd3b96 Merging the meta-simplifier with the Provers-simplifier. Next step:
skalberg
parents: 15001
diff changeset
  1175
  let
15023
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
  1176
    val Simpset (_, {solvers = (unsafe_solvers, _), ...}) = ss;
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
  1177
    val tacf = solve_all_tac unsafe_solvers;
0e4689f411d5 major cleanup; got rid of obsolete meta_simpset;
wenzelm
parents: 15011
diff changeset
  1178
    fun prover s th = apsome #1 (Seq.pull (tacf s th));
15011
35be762f58f9 Made simplification procedures simpset-aware.
skalberg
parents: 15006
diff changeset
  1179
  in rew mode prover ss thm end;
15006
107e4dfd3b96 Merging the meta-simplifier with the Provers-simplifier. Next step:
skalberg
parents: 15001
diff changeset
  1180
107e4dfd3b96 Merging the meta-simplifier with the Provers-simplifier. Next step:
skalberg
parents: 15001
diff changeset
  1181
val simp_thm = simp rewrite_thm;
107e4dfd3b96 Merging the meta-simplifier with the Provers-simplifier. Next step:
skalberg
parents: 15001
diff changeset
  1182
val simp_cterm = simp rewrite_cterm;
107e4dfd3b96 Merging the meta-simplifier with the Provers-simplifier. Next step:
skalberg
parents: 15001
diff changeset
  1183
10413
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
  1184
end;
0e015d9bea4e Added new file meta_simplifier.ML
berghofe
parents:
diff changeset
  1185
11672
8e75b78f33f3 full_rewrite_cterm_aux (see also tactic.ML);
wenzelm
parents: 11505
diff changeset
  1186
structure BasicMetaSimplifier: BASIC_META_SIMPLIFIER = MetaSimplifier;
8e75b78f33f3 full_rewrite_cterm_aux (see also tactic.ML);
wenzelm
parents: 11505
diff changeset
  1187
open BasicMetaSimplifier;