(* Title: nominal_library.ML+ −
Author: Christian Urban+ −
+ −
Basic functions for nominal.+ −
*)+ −
+ −
signature NOMINAL_LIBRARY =+ −
sig+ −
val trace: bool Unsynchronized.ref+ −
val trace_msg: (unit -> string) -> unit+ −
+ −
val last2: 'a list -> 'a * 'a+ −
val split_last2: 'a list -> 'a list * 'a * 'a+ −
val order: ('a * 'a -> bool) -> 'a list -> ('a * 'b) list -> 'b list+ −
val order_default: ('a * 'a -> bool) -> 'b -> 'a list -> ('a * 'b) list -> 'b list+ −
val remove_dups: ('a * 'a -> bool) -> 'a list -> 'a list+ −
val map4: ('a -> 'b -> 'c -> 'd -> 'e) -> 'a list -> 'b list -> 'c list -> 'd list -> 'e list+ −
val split_filter: ('a -> bool) -> 'a list -> 'a list * 'a list+ −
val fold_left: ('a * 'a -> 'a) -> 'a list -> 'a -> 'a+ −
+ −
val is_true: term -> bool+ −
+ −
val dest_listT: typ -> typ+ −
val dest_fsetT: typ -> typ+ −
+ −
val mk_id: term -> term+ −
val mk_all: (string * typ) -> term -> term+ −
val mk_All: (string * typ) -> term -> term+ −
val mk_exists: (string * typ) -> term -> term+ −
+ −
val sum_case_const: typ -> typ -> typ -> term+ −
val mk_sum_case: term -> term -> term+ −
+ −
val mk_minus: term -> term+ −
val mk_plus: term -> term -> term+ −
+ −
val perm_ty: typ -> typ + −
val perm_const: typ -> term+ −
val mk_perm_ty: typ -> term -> term -> term+ −
val mk_perm: term -> term -> term+ −
val dest_perm: term -> term * term+ −
+ −
val mk_sort_of: term -> term+ −
val atom_ty: typ -> typ+ −
val atom_const: typ -> term+ −
val mk_atom_ty: typ -> term -> term+ −
val mk_atom: term -> term+ −
+ −
val mk_atom_set_ty: typ -> term -> term+ −
val mk_atom_set: term -> term+ −
val mk_atom_fset_ty: typ -> term -> term+ −
val mk_atom_fset: term -> term+ −
val mk_atom_list_ty: typ -> term -> term+ −
val mk_atom_list: term -> term+ −
+ −
val is_atom: Proof.context -> typ -> bool+ −
val is_atom_set: Proof.context -> typ -> bool+ −
val is_atom_fset: Proof.context -> typ -> bool+ −
val is_atom_list: Proof.context -> typ -> bool+ −
+ −
val to_set_ty: typ -> term -> term+ −
val to_set: term -> term+ −
+ −
val atomify_ty: Proof.context -> typ -> term -> term+ −
val atomify: Proof.context -> term -> term+ −
val setify_ty: Proof.context -> typ -> term -> term+ −
val setify: Proof.context -> term -> term+ −
val listify_ty: Proof.context -> typ -> term -> term+ −
val listify: Proof.context -> term -> term+ −
+ −
val fresh_star_ty: typ -> typ+ −
val fresh_star_const: typ -> term+ −
val mk_fresh_star_ty: typ -> term -> term -> term+ −
val mk_fresh_star: term -> term -> term+ −
+ −
val supp_ty: typ -> typ+ −
val supp_const: typ -> term+ −
val mk_supp_ty: typ -> term -> term+ −
val mk_supp: term -> term+ −
+ −
val supp_rel_ty: typ -> typ+ −
val supp_rel_const: typ -> term+ −
val mk_supp_rel_ty: typ -> term -> term -> term+ −
val mk_supp_rel: term -> term -> term + −
+ −
val supports_const: typ -> term+ −
val mk_supports_ty: typ -> term -> term -> term+ −
val mk_supports: term -> term -> term+ −
+ −
val finite_const: typ -> term+ −
val mk_finite_ty: typ -> term -> term+ −
val mk_finite: term -> term+ −
+ −
val mk_equiv: thm -> thm+ −
val safe_mk_equiv: thm -> thm+ −
+ −
val mk_diff: term * term -> term+ −
val mk_append: term * term -> term+ −
val mk_union: term * term -> term+ −
val fold_union: term list -> term+ −
val fold_append: term list -> term+ −
val mk_conj: term * term -> term+ −
val fold_conj: term list -> term+ −
+ −
(* functions for de-Bruijn open terms *)+ −
val mk_binop_env: typ list -> string -> term * term -> term+ −
val mk_union_env: typ list -> term * term -> term+ −
val fold_union_env: typ list -> term list -> term+ −
+ −
(* fresh arguments for a term *)+ −
val fresh_args: Proof.context -> term -> term list+ −
+ −
(* some logic operations *)+ −
val strip_full_horn: term -> (string * typ) list * term list * term+ −
val mk_full_horn: (string * typ) list -> term list -> term -> term+ −
+ −
(* datatype operations *)+ −
type cns_info = (term * typ * typ list * bool list) list+ −
+ −
val all_dtyps: Datatype_Aux.descr -> (string * sort) list -> typ list+ −
val nth_dtyp: Datatype_Aux.descr -> (string * sort) list -> int -> typ+ −
val all_dtyp_constrs_types: Datatype_Aux.descr -> (string * sort) list -> cns_info list+ −
val nth_dtyp_constrs_types: Datatype_Aux.descr -> (string * sort) list -> int -> cns_info+ −
val prefix_dt_names: Datatype_Aux.descr -> (string * sort) list -> string -> string list+ −
+ −
(* tactics for function package *)+ −
val size_simpset: simpset+ −
val pat_completeness_simp: thm list -> Proof.context -> tactic+ −
val prove_termination_ind: Proof.context -> int -> tactic+ −
val prove_termination_fun: thm list -> Proof.context -> Function.info * local_theory+ −
+ −
(* transformations of premises in inductions *)+ −
val transform_prem1: Proof.context -> string list -> thm -> thm+ −
val transform_prem2: Proof.context -> string list -> thm -> thm+ −
+ −
(* transformation into the object logic *)+ −
val atomize: thm -> thm+ −
+ −
(* applies a tactic to a formula composed of conjunctions *)+ −
val conj_tac: (int -> tactic) -> int -> tactic+ −
end+ −
+ −
+ −
structure Nominal_Library: NOMINAL_LIBRARY =+ −
struct+ −
+ −
val trace = Unsynchronized.ref false+ −
fun trace_msg msg = if ! trace then tracing (msg ()) else ()+ −
+ −
+ −
(* orders an AList according to keys - every key needs to be there *)+ −
fun order eq keys list = + −
map (the o AList.lookup eq list) keys+ −
+ −
(* orders an AList according to keys - returns default for non-existing keys *)+ −
fun order_default eq default keys list = + −
map (the_default default o AList.lookup eq list) keys+ −
+ −
(* remove duplicates *)+ −
fun remove_dups eq [] = []+ −
| remove_dups eq (x :: xs) = + −
if member eq xs x + −
then remove_dups eq xs + −
else x :: remove_dups eq xs+ −
+ −
fun last2 [] = raise Empty+ −
| last2 [_] = raise Empty+ −
| last2 [x, y] = (x, y)+ −
| last2 (_ :: xs) = last2 xs+ −
+ −
fun split_last2 xs = + −
let+ −
val (xs', x) = split_last xs+ −
val (xs'', y) = split_last xs'+ −
in+ −
(xs'', y, x)+ −
end+ −
+ −
fun map4 _ [] [] [] [] = []+ −
| map4 f (x :: xs) (y :: ys) (z :: zs) (u :: us) = f x y z u :: map4 f xs ys zs us+ −
+ −
fun split_filter f [] = ([], [])+ −
| split_filter f (x :: xs) =+ −
let + −
val (r, l) = split_filter f xs + −
in + −
if f x + −
then (x :: r, l) + −
else (r, x :: l) + −
end+ −
+ −
(* to be used with left-infix binop-operations *)+ −
fun fold_left f [] z = z+ −
| fold_left f [x] z = x+ −
| fold_left f (x :: y :: xs) z = fold_left f (f (x, y) :: xs) z+ −
+ −
+ −
+ −
fun is_true @{term "Trueprop True"} = true+ −
| is_true _ = false + −
+ −
fun dest_listT (Type (@{type_name list}, [T])) = T+ −
| dest_listT T = raise TYPE ("dest_listT: list type expected", [T], [])+ −
+ −
fun dest_fsetT (Type (@{type_name fset}, [T])) = T+ −
| dest_fsetT T = raise TYPE ("dest_fsetT: fset type expected", [T], []);+ −
+ −
+ −
fun mk_id trm = HOLogic.id_const (fastype_of trm) $ trm+ −
+ −
fun mk_all (a, T) t = Term.all T $ Abs (a, T, t)+ −
+ −
fun mk_All (a, T) t = HOLogic.all_const T $ Abs (a, T, t)+ −
+ −
fun mk_exists (a, T) t = HOLogic.exists_const T $ Abs (a, T, t)+ −
+ −
fun sum_case_const ty1 ty2 ty3 = + −
Const (@{const_name sum_case}, [ty1 --> ty3, ty2 --> ty3, Type (@{type_name sum}, [ty1, ty2])] ---> ty3)+ −
+ −
fun mk_sum_case trm1 trm2 =+ −
let+ −
val ([ty1], ty3) = strip_type (fastype_of trm1)+ −
val ty2 = domain_type (fastype_of trm2)+ −
in+ −
sum_case_const ty1 ty2 ty3 $ trm1 $ trm2+ −
end + −
+ −
+ −
+ −
fun mk_minus p = @{term "uminus::perm => perm"} $ p+ −
+ −
fun mk_plus p q = @{term "plus::perm => perm => perm"} $ p $ q+ −
+ −
fun perm_ty ty = @{typ "perm"} --> ty --> ty+ −
fun perm_const ty = Const (@{const_name "permute"}, perm_ty ty)+ −
fun mk_perm_ty ty p trm = perm_const ty $ p $ trm+ −
fun mk_perm p trm = mk_perm_ty (fastype_of trm) p trm+ −
+ −
fun dest_perm (Const (@{const_name "permute"}, _) $ p $ t) = (p, t)+ −
| dest_perm t = raise TERM ("dest_perm", [t]);+ −
+ −
fun mk_sort_of t = @{term "sort_of"} $ t;+ −
+ −
fun atom_ty ty = ty --> @{typ "atom"};+ −
fun atom_const ty = Const (@{const_name "atom"}, atom_ty ty)+ −
fun mk_atom_ty ty t = atom_const ty $ t;+ −
fun mk_atom t = mk_atom_ty (fastype_of t) t;+ −
+ −
fun mk_atom_set_ty ty t =+ −
let+ −
val atom_ty = HOLogic.dest_setT ty + −
val img_ty = (atom_ty --> @{typ atom}) --> ty --> @{typ "atom set"};+ −
in+ −
Const (@{const_name image}, img_ty) $ atom_const atom_ty $ t+ −
end+ −
+ −
fun mk_atom_fset_ty ty t =+ −
let+ −
val atom_ty = dest_fsetT ty+ −
val fmap_ty = (atom_ty --> @{typ atom}) --> ty --> @{typ "atom fset"};+ −
in+ −
Const (@{const_name map_fset}, fmap_ty) $ atom_const atom_ty $ t+ −
end+ −
+ −
fun mk_atom_list_ty ty t =+ −
let+ −
val atom_ty = dest_listT ty+ −
val map_ty = (atom_ty --> @{typ atom}) --> ty --> @{typ "atom list"}+ −
in+ −
Const (@{const_name map}, map_ty) $ atom_const atom_ty $ t+ −
end+ −
+ −
fun mk_atom_set t = mk_atom_set_ty (fastype_of t) t+ −
fun mk_atom_fset t = mk_atom_fset_ty (fastype_of t) t+ −
fun mk_atom_list t = mk_atom_list_ty (fastype_of t) t+ −
+ −
(* coerces a list into a set *)+ −
+ −
fun to_set_ty ty t =+ −
case ty of+ −
@{typ "atom list"} => @{term "set :: atom list => atom set"} $ t+ −
| @{typ "atom fset"} => @{term "fset :: atom fset => atom set"} $ t+ −
| _ => t+ −
+ −
fun to_set t = to_set_ty (fastype_of t) t+ −
+ −
+ −
(* testing for concrete atom types *)+ −
fun is_atom ctxt ty =+ −
Sign.of_sort (ProofContext.theory_of ctxt) (ty, @{sort at_base})+ −
+ −
fun is_atom_set ctxt (Type ("fun", [ty, @{typ bool}])) = is_atom ctxt ty+ −
| is_atom_set _ _ = false;+ −
+ −
fun is_atom_fset ctxt (Type (@{type_name "fset"}, [ty])) = is_atom ctxt ty+ −
| is_atom_fset _ _ = false;+ −
+ −
fun is_atom_list ctxt (Type (@{type_name "list"}, [ty])) = is_atom ctxt ty+ −
| is_atom_list _ _ = false+ −
+ −
+ −
(* functions that coerce singletons, sets, fsets and lists of concrete + −
atoms into general atoms sets / lists *)+ −
fun atomify_ty ctxt ty t =+ −
if is_atom ctxt ty+ −
then mk_atom_ty ty t+ −
else if is_atom_set ctxt ty+ −
then mk_atom_set_ty ty t+ −
else if is_atom_fset ctxt ty+ −
then mk_atom_fset_ty ty t+ −
else if is_atom_list ctxt ty+ −
then mk_atom_list_ty ty t+ −
else raise TERM ("atomify", [t])+ −
+ −
fun setify_ty ctxt ty t =+ −
if is_atom ctxt ty+ −
then HOLogic.mk_set @{typ atom} [mk_atom_ty ty t]+ −
else if is_atom_set ctxt ty+ −
then mk_atom_set_ty ty t+ −
else if is_atom_fset ctxt ty+ −
then @{term "fset :: atom fset => atom set"} $ mk_atom_fset_ty ty t+ −
else if is_atom_list ctxt ty+ −
then @{term "set :: atom list => atom set"} $ mk_atom_list_ty ty t+ −
else raise TERM ("setify", [t])+ −
+ −
fun listify_ty ctxt ty t =+ −
if is_atom ctxt ty+ −
then HOLogic.mk_list @{typ atom} [mk_atom_ty ty t]+ −
else if is_atom_list ctxt ty+ −
then mk_atom_list_ty ty t+ −
else raise TERM ("listify", [t])+ −
+ −
fun atomify ctxt t = atomify_ty ctxt (fastype_of t) t+ −
fun setify ctxt t = setify_ty ctxt (fastype_of t) t+ −
fun listify ctxt t = listify_ty ctxt (fastype_of t) t+ −
+ −
fun fresh_star_ty ty = [@{typ "atom set"}, ty] ---> @{typ bool}+ −
fun fresh_star_const ty = Const (@{const_name fresh_star}, fresh_star_ty ty)+ −
fun mk_fresh_star_ty ty t1 t2 = fresh_star_const ty $ t1 $ t2+ −
fun mk_fresh_star t1 t2 = mk_fresh_star_ty (fastype_of t2) t1 t2+ −
+ −
fun supp_ty ty = ty --> @{typ "atom set"};+ −
fun supp_const ty = Const (@{const_name supp}, supp_ty ty)+ −
fun mk_supp_ty ty t = supp_const ty $ t+ −
fun mk_supp t = mk_supp_ty (fastype_of t) t+ −
+ −
fun supp_rel_ty ty = ([ty, ty] ---> @{typ bool}) --> ty --> @{typ "atom set"};+ −
fun supp_rel_const ty = Const (@{const_name supp_rel}, supp_rel_ty ty)+ −
fun mk_supp_rel_ty ty r t = supp_rel_const ty $ r $ t+ −
fun mk_supp_rel r t = mk_supp_rel_ty (fastype_of t) r t+ −
+ −
fun supports_const ty = Const (@{const_name supports}, [@{typ "atom set"}, ty] ---> @{typ bool});+ −
fun mk_supports_ty ty t1 t2 = supports_const ty $ t1 $ t2;+ −
fun mk_supports t1 t2 = mk_supports_ty (fastype_of t2) t1 t2;+ −
+ −
fun finite_const ty = Const (@{const_name finite}, ty --> @{typ bool})+ −
fun mk_finite_ty ty t = finite_const ty $ t+ −
fun mk_finite t = mk_finite_ty (fastype_of t) t+ −
+ −
+ −
fun mk_equiv r = r RS @{thm eq_reflection};+ −
fun safe_mk_equiv r = mk_equiv r handle Thm.THM _ => r;+ −
+ −
+ −
(* functions that construct differences, appends and unions+ −
but avoid producing empty atom sets or empty atom lists *)+ −
+ −
fun mk_diff (@{term "{}::atom set"}, _) = @{term "{}::atom set"}+ −
| mk_diff (t1, @{term "{}::atom set"}) = t1+ −
| mk_diff (@{term "set ([]::atom list)"}, _) = @{term "set ([]::atom list)"}+ −
| mk_diff (t1, @{term "set ([]::atom list)"}) = t1+ −
| mk_diff (t1, t2) = HOLogic.mk_binop @{const_name minus} (t1, t2)+ −
+ −
fun mk_append (t1, @{term "[]::atom list"}) = t1+ −
| mk_append (@{term "[]::atom list"}, t2) = t2+ −
| mk_append (t1, t2) = HOLogic.mk_binop @{const_name "append"} (t1, t2) + −
+ −
fun mk_union (t1, @{term "{}::atom set"}) = t1+ −
| mk_union (@{term "{}::atom set"}, t2) = t2+ −
| mk_union (t1, @{term "set ([]::atom list)"}) = t1+ −
| mk_union (@{term "set ([]::atom list)"}, t2) = t2+ −
| mk_union (t1, t2) = HOLogic.mk_binop @{const_name "sup"} (t1, t2) + −
+ −
fun fold_union trms = fold_rev (curry mk_union) trms @{term "{}::atom set"}+ −
fun fold_append trms = fold_rev (curry mk_append) trms @{term "[]::atom list"}+ −
+ −
fun mk_conj (t1, @{term "True"}) = t1+ −
| mk_conj (@{term "True"}, t2) = t2+ −
| mk_conj (t1, t2) = HOLogic.mk_conj (t1, t2)+ −
+ −
fun fold_conj trms = fold_rev (curry mk_conj) trms @{term "True"}+ −
+ −
+ −
(* functions for de-Bruijn open terms *)+ −
+ −
fun mk_binop_env tys c (t, u) =+ −
let + −
val ty = fastype_of1 (tys, t) + −
in+ −
Const (c, [ty, ty] ---> ty) $ t $ u+ −
end+ −
+ −
fun mk_union_env tys (t1, @{term "{}::atom set"}) = t1+ −
| mk_union_env tys (@{term "{}::atom set"}, t2) = t2+ −
| mk_union_env tys (t1, @{term "set ([]::atom list)"}) = t1+ −
| mk_union_env tys (@{term "set ([]::atom list)"}, t2) = t2+ −
| mk_union_env tys (t1, t2) = mk_binop_env tys @{const_name "sup"} (t1, t2) + −
+ −
fun fold_union_env tys trms = fold_left (mk_union_env tys) trms @{term "{}::atom set"} + −
+ −
+ −
(* produces fresh arguments for a term *)+ −
+ −
fun fresh_args ctxt f =+ −
f |> fastype_of+ −
|> binder_types+ −
|> map (pair "z")+ −
|> Variable.variant_frees ctxt [f]+ −
|> map Free+ −
+ −
+ −
(** some logic operations **)+ −
+ −
(* decompses a formula into params, premises and a conclusion *)+ −
fun strip_full_horn trm =+ −
let+ −
fun strip_outer_params (Const ("all", _) $ Abs (a, T, t)) = strip_outer_params t |>> cons (a, T)+ −
| strip_outer_params B = ([], B)+ −
+ −
val (params, body) = strip_outer_params trm+ −
val (prems, concl) = Logic.strip_horn body+ −
in+ −
(params, prems, concl)+ −
end+ −
+ −
(* composes a formula out of params, premises and a conclusion *)+ −
fun mk_full_horn params prems concl =+ −
Logic.list_implies (prems, concl)+ −
|> fold_rev mk_all params+ −
+ −
(** datatypes **)+ −
+ −
(* constructor infos *)+ −
type cns_info = (term * typ * typ list * bool list) list+ −
+ −
(* - term for constructor constant+ −
- type of the constructor+ −
- types of the arguments+ −
- flags indicating whether the argument is recursive+ −
*)+ −
+ −
(* returns the type of the nth datatype *)+ −
fun all_dtyps descr sorts = + −
map (fn n => Datatype_Aux.typ_of_dtyp descr sorts (Datatype_Aux.DtRec n)) (0 upto (length descr - 1))+ −
+ −
fun nth_dtyp descr sorts n = + −
Datatype_Aux.typ_of_dtyp descr sorts (Datatype_Aux.DtRec n);+ −
+ −
(* returns info about constructors in a datatype *)+ −
fun all_dtyp_constrs_info descr = + −
map (fn (_, (ty, vs, constrs)) => map (pair (ty, vs)) constrs) descr+ −
+ −
(* returns the constants of the constructors plus the + −
corresponding type and types of arguments *)+ −
fun all_dtyp_constrs_types descr sorts = + −
let+ −
fun aux ((ty_name, vs), (cname, args)) =+ −
let+ −
val vs_tys = map (Datatype_Aux.typ_of_dtyp descr sorts) vs+ −
val ty = Type (ty_name, vs_tys)+ −
val arg_tys = map (Datatype_Aux.typ_of_dtyp descr sorts) args+ −
val is_rec = map Datatype_Aux.is_rec_type args+ −
in+ −
(Const (cname, arg_tys ---> ty), ty, arg_tys, is_rec)+ −
end+ −
in+ −
map (map aux) (all_dtyp_constrs_info descr)+ −
end+ −
+ −
fun nth_dtyp_constrs_types descr sorts n =+ −
nth (all_dtyp_constrs_types descr sorts) n+ −
+ −
+ −
(* generates for every datatype a name str ^ dt_name + −
plus and index for multiple occurences of a string *)+ −
fun prefix_dt_names descr sorts str = + −
let+ −
fun get_nth_name (i, _) = + −
Datatype_Aux.name_of_typ (nth_dtyp descr sorts i) + −
in+ −
Datatype_Prop.indexify_names + −
(map (prefix str o get_nth_name) descr)+ −
end+ −
+ −
+ −
+ −
(** function package tactics **)+ −
+ −
fun pat_completeness_simp simps lthy =+ −
let+ −
val simp_set = HOL_basic_ss addsimps (@{thms sum.inject sum.distinct} @ simps)+ −
in+ −
Pat_Completeness.pat_completeness_tac lthy 1+ −
THEN ALLGOALS (asm_full_simp_tac simp_set)+ −
end+ −
+ −
(* simpset for size goals *)+ −
val size_simpset = HOL_ss+ −
addsimprocs Nat_Numeral_Simprocs.cancel_numerals+ −
addsimps @{thms in_measure wf_measure sum.cases add_Suc_right add.right_neutral + −
zero_less_Suc prod.size(1) mult_Suc_right}+ −
+ −
val natT = @{typ nat}+ −
+ −
fun prod_size_const T1 T2 = + −
let+ −
val T1_fun = T1 --> natT+ −
val T2_fun = T2 --> natT+ −
val prodT = HOLogic.mk_prodT (T1, T2)+ −
in+ −
Const (@{const_name prod_size}, [T1_fun, T2_fun, prodT] ---> natT)+ −
end+ −
+ −
fun snd_const T1 T2 =+ −
Const ("Product_Type.snd", HOLogic.mk_prodT (T1, T2) --> T2) + −
+ −
+ −
fun mk_measure_trm f ctxt T = + −
HOLogic.dest_setT T+ −
|> fst o HOLogic.dest_prodT+ −
|> f+ −
|> curry (op $) (Const (@{const_name "measure"}, dummyT))+ −
|> Syntax.check_term ctxt+ −
+ −
(* wf-goal arising in induction_schema *) + −
fun prove_termination_ind ctxt =+ −
let+ −
fun mk_size_measure T =+ −
case T of + −
(Type (@{type_name Sum_Type.sum}, [T1, T2])) =>+ −
SumTree.mk_sumcase T1 T2 natT (mk_size_measure T1) (mk_size_measure T2)+ −
| (Type (@{type_name Product_Type.prod}, [T1, T2])) =>+ −
HOLogic.mk_comp (mk_size_measure T2, snd_const T1 T2)+ −
| _ => HOLogic.size_const T+ −
+ −
val measure_trm = mk_measure_trm (mk_size_measure) ctxt+ −
in + −
Function_Relation.relation_tac ctxt measure_trm+ −
end+ −
+ −
(* wf-goal arising in function definitions *)+ −
fun prove_termination_fun size_simps ctxt =+ −
let+ −
fun mk_size_measure T =+ −
case T of + −
(Type (@{type_name Sum_Type.sum}, [T1, T2])) =>+ −
SumTree.mk_sumcase T1 T2 natT (mk_size_measure T1) (mk_size_measure T2)+ −
| (Type (@{type_name Product_Type.prod}, [T1, T2])) =>+ −
prod_size_const T1 T2 $ (mk_size_measure T1) $ (mk_size_measure T2)+ −
| _ => HOLogic.size_const T+ −
+ −
val measure_trm = mk_measure_trm (mk_size_measure) ctxt+ −
+ −
val tac = + −
Function_Relation.relation_tac ctxt measure_trm+ −
THEN_ALL_NEW simp_tac (size_simpset addsimps size_simps)+ −
in + −
Function.prove_termination NONE (HEADGOAL tac) ctxt+ −
end+ −
+ −
(** transformations of premises (in inductive proofs) **)+ −
+ −
(* + −
given the theorem F[t]; proves the theorem F[f t] + −
+ −
- F needs to be monotone+ −
- f returns either SOME for a term it fires on + −
and NONE elsewhere + −
*)+ −
fun map_term f t = + −
(case f t of+ −
NONE => map_term' f t + −
| x => x)+ −
and map_term' f (t $ u) = + −
(case (map_term f t, map_term f u) of+ −
(NONE, NONE) => NONE+ −
| (SOME t'', NONE) => SOME (t'' $ u)+ −
| (NONE, SOME u'') => SOME (t $ u'')+ −
| (SOME t'', SOME u'') => SOME (t'' $ u''))+ −
| map_term' f (Abs (s, T, t)) = + −
(case map_term f t of+ −
NONE => NONE+ −
| SOME t'' => SOME (Abs (s, T, t'')))+ −
| map_term' _ _ = NONE;+ −
+ −
fun map_thm_tac ctxt tac thm =+ −
let+ −
val monos = Inductive.get_monos ctxt+ −
val simps = HOL_basic_ss addsimps @{thms split_def}+ −
in+ −
EVERY [cut_facts_tac [thm] 1, etac rev_mp 1, + −
REPEAT_DETERM (FIRSTGOAL (simp_tac simps THEN' resolve_tac monos)),+ −
REPEAT_DETERM (rtac impI 1 THEN (atac 1 ORELSE tac))]+ −
end+ −
+ −
fun map_thm ctxt f tac thm =+ −
let+ −
val opt_goal_trm = map_term f (prop_of thm)+ −
in+ −
case opt_goal_trm of+ −
NONE => thm+ −
| SOME goal =>+ −
Goal.prove ctxt [] [] goal (fn _ => map_thm_tac ctxt tac thm) + −
end+ −
+ −
(*+ −
inductive premises can be of the form+ −
R ... /\ P ...; split_conj_i picks out+ −
the part R or P part+ −
*)+ −
fun split_conj1 names (Const (@{const_name "conj"}, _) $ f1 $ _) = + −
(case head_of f1 of+ −
Const (name, _) => if member (op =) names name then SOME f1 else NONE+ −
| _ => NONE)+ −
| split_conj1 _ _ = NONE;+ −
+ −
fun split_conj2 names (Const (@{const_name "conj"}, _) $ f1 $ f2) = + −
(case head_of f1 of+ −
Const (name, _) => if member (op =) names name then SOME f2 else NONE+ −
| _ => NONE)+ −
| split_conj2 _ _ = NONE;+ −
+ −
fun transform_prem1 ctxt names thm =+ −
map_thm ctxt (split_conj1 names) (etac conjunct1 1) thm+ −
+ −
fun transform_prem2 ctxt names thm =+ −
map_thm ctxt (split_conj2 names) (etac conjunct2 1) thm+ −
+ −
+ −
(* transformes a theorem into one of the object logic *)+ −
val atomize = Conv.fconv_rule Object_Logic.atomize o forall_intr_vars+ −
+ −
(* applies a tactic to a formula composed of conjunctions *)+ −
fun conj_tac tac i =+ −
let+ −
fun select (trm, i) =+ −
case trm of+ −
@{term "Trueprop"} $ t' => select (t', i)+ −
| @{term "op &"} $ _ $ _ => EVERY' [rtac @{thm conjI}, RANGE [conj_tac tac, conj_tac tac]] i+ −
| _ => tac i+ −
in+ −
SUBGOAL select i+ −
end+ −
+ −
+ −
end (* structure *)+ −
+ −
open Nominal_Library;+ −