theory LFex

imports "Nominal2_Atoms" "Nominal2_Eqvt" "Nominal2_Supp" "Abs" "Perm" "Fv" "Rsp"

begin

atom_decl name

atom_decl ident

datatype rkind =

    Type

  | KPi "rty" "name" "rkind"

and rty =

    TConst "ident"

  | TApp "rty" "rtrm"

  | TPi "rty" "name" "rty"

and rtrm =

    Const "ident"

  | Var "name"

  | App "rtrm" "rtrm"

  | Lam "rty" "name" "rtrm"

setup {* snd o define_raw_perms (Datatype.the_info @{theory} "LFex.rkind") 3 *}

print_theorems

local_setup {*

  snd o define_fv_alpha (Datatype.the_info @{theory} "LFex.rkind")

  [[ [], [(NONE, 1, 2)]],

   [ [], [], [(NONE, 1, 2)] ],

   [ [], [], [], [(NONE, 1, 2)]]] *}

notation

    alpha_rkind  ("_ \<approx>ki _" [100, 100] 100)

and alpha_rty    ("_ \<approx>ty _" [100, 100] 100)

and alpha_rtrm   ("_ \<approx>tr _" [100, 100] 100)

thm fv_rkind_fv_rty_fv_rtrm.simps alpha_rkind_alpha_rty_alpha_rtrm.intros

local_setup {* (fn ctxt => snd (Local_Theory.note ((@{binding alpha_rkind_alpha_rty_alpha_rtrm_inj}, []), (build_alpha_inj @{thms alpha_rkind_alpha_rty_alpha_rtrm.intros} @{thms rkind.distinct rty.distinct rtrm.distinct rkind.inject rty.inject rtrm.inject} @{thms alpha_rkind.cases alpha_rty.cases alpha_rtrm.cases} ctxt)) ctxt)) *}

thm alpha_rkind_alpha_rty_alpha_rtrm_inj

lemma rfv_eqvt[eqvt]:

  "((pi\<bullet>fv_rkind t1) = fv_rkind (pi\<bullet>t1))"

  "((pi\<bullet>fv_rty t2) = fv_rty (pi\<bullet>t2))"

  "((pi\<bullet>fv_rtrm t3) = fv_rtrm (pi\<bullet>t3))"

apply(induct t1 and t2 and t3 rule: rkind_rty_rtrm.inducts)

apply(simp_all add: union_eqvt Diff_eqvt)

apply(simp_all add: permute_set_eq atom_eqvt)

done

lemma alpha_eqvt:

  "(t1 \<approx>ki s1 \<longrightarrow> (p \<bullet> t1) \<approx>ki (p \<bullet> s1)) \<and>

   (t2 \<approx>ty s2 \<longrightarrow> (p \<bullet> t2) \<approx>ty (p \<bullet> s2)) \<and>

   (t3 \<approx>tr s3 \<longrightarrow> (p \<bullet> t3) \<approx>tr (p \<bullet> s3))"

apply(rule alpha_rkind_alpha_rty_alpha_rtrm.induct)

apply (simp_all add: alpha_rkind_alpha_rty_alpha_rtrm_inj)

apply (erule alpha_gen_compose_eqvt)

apply (simp_all add: rfv_eqvt eqvts atom_eqvt)

apply (erule alpha_gen_compose_eqvt)

apply (simp_all add: rfv_eqvt eqvts atom_eqvt)

apply (erule alpha_gen_compose_eqvt)

apply (simp_all add: rfv_eqvt eqvts atom_eqvt)

done

local_setup {* (fn ctxt => snd (Local_Theory.note ((@{binding alpha_equivps}, []),

  (build_equivps [@{term alpha_rkind}, @{term alpha_rty}, @{term alpha_rtrm}]

     @{thm rkind_rty_rtrm.induct} @{thm alpha_rkind_alpha_rty_alpha_rtrm.induct} 

     @{thms rkind.inject rty.inject rtrm.inject} @{thms alpha_rkind_alpha_rty_alpha_rtrm_inj}

     @{thms rkind.distinct rty.distinct rtrm.distinct}

     @{thms alpha_rkind.cases alpha_rty.cases alpha_rtrm.cases}

     @{thms alpha_eqvt} ctxt)) ctxt)) *}

thm alpha_equivps

local_setup  {* define_quotient_type

  [(([], @{binding kind}, NoSyn), (@{typ rkind}, @{term alpha_rkind})),

   (([], @{binding ty},   NoSyn), (@{typ rty},   @{term alpha_rty}  )),

   (([], @{binding trm},  NoSyn), (@{typ rtrm},  @{term alpha_rtrm} ))]

  (ALLGOALS (resolve_tac @{thms alpha_equivps}))

*}

local_setup {*

(fn ctxt => ctxt

 |> snd o (Quotient_Def.quotient_lift_const ("TYP", @{term Type}))

 |> snd o (Quotient_Def.quotient_lift_const ("KPI", @{term KPi}))

 |> snd o (Quotient_Def.quotient_lift_const ("TCONST", @{term TConst}))

 |> snd o (Quotient_Def.quotient_lift_const ("TAPP", @{term TApp}))

 |> snd o (Quotient_Def.quotient_lift_const ("TPI", @{term TPi}))

 |> snd o (Quotient_Def.quotient_lift_const ("CONS", @{term Const}))

 |> snd o (Quotient_Def.quotient_lift_const ("VAR", @{term Var}))

 |> snd o (Quotient_Def.quotient_lift_const ("APP", @{term App}))

 |> snd o (Quotient_Def.quotient_lift_const ("LAM", @{term Lam}))

 |> snd o (Quotient_Def.quotient_lift_const ("fv_kind", @{term fv_rkind}))

 |> snd o (Quotient_Def.quotient_lift_const ("fv_ty", @{term fv_rty}))

 |> snd o (Quotient_Def.quotient_lift_const ("fv_trm", @{term fv_rtrm}))) *}

print_theorems

local_setup {* snd o prove_const_rsp @{binding rfv_rsp} [@{term fv_rkind}, @{term fv_rty}, @{term fv_rtrm}]

  (fn _ => fvbv_rsp_tac @{thm alpha_rkind_alpha_rty_alpha_rtrm.induct} @{thms fv_rkind_fv_rty_fv_rtrm.simps} 1) *}

local_setup {* snd o prove_const_rsp Binding.empty [@{term "permute :: perm \<Rightarrow> rkind \<Rightarrow> rkind"}, @{term "permute :: perm \<Rightarrow> rty \<Rightarrow> rty"}, @{term "permute :: perm \<Rightarrow> rtrm \<Rightarrow> rtrm"}]

  (fn _ => asm_simp_tac (HOL_ss addsimps @{thms alpha_eqvt}) 1) *}

ML {* fun const_rsp_tac _ = constr_rsp_tac @{thms alpha_rkind_alpha_rty_alpha_rtrm_inj}

  @{thms rfv_rsp} @{thms alpha_equivps} 1 *}

local_setup {* snd o prove_const_rsp Binding.empty [@{term TConst}] const_rsp_tac *}

local_setup {* snd o prove_const_rsp Binding.empty [@{term TApp}] const_rsp_tac *}

local_setup {* snd o prove_const_rsp Binding.empty [@{term Var}] const_rsp_tac *}

local_setup {* snd o prove_const_rsp Binding.empty [@{term App}] const_rsp_tac *}

local_setup {* snd o prove_const_rsp Binding.empty [@{term Const}] const_rsp_tac *}

local_setup {* snd o prove_const_rsp Binding.empty [@{term KPi}] const_rsp_tac *}

local_setup {* snd o prove_const_rsp Binding.empty [@{term TPi}] const_rsp_tac *}

local_setup {* snd o prove_const_rsp Binding.empty [@{term Lam}] const_rsp_tac *}

lemmas kind_ty_trm_induct = rkind_rty_rtrm.induct[quot_lifted]

thm rkind_rty_rtrm.inducts

lemmas kind_ty_trm_inducts = rkind_rty_rtrm.inducts[quot_lifted]

setup {* define_lifted_perms ["LFex.kind", "LFex.ty", "LFex.trm"] 

  [("permute_kind", @{term "permute :: perm \<Rightarrow> rkind \<Rightarrow> rkind"}),

   ("permute_ty", @{term "permute :: perm \<Rightarrow> rty \<Rightarrow> rty"}),

   ("permute_trm", @{term "permute :: perm \<Rightarrow> rtrm \<Rightarrow> rtrm"})]

  @{thms permute_rkind_permute_rty_permute_rtrm_zero permute_rkind_permute_rty_permute_rtrm_append} *}

(*

Lifts, but slow and not needed?.

lemmas alpha_kind_alpha_ty_alpha_trm_induct = alpha_rkind_alpha_rty_alpha_rtrm.induct[unfolded alpha_gen, quot_lifted, folded alpha_gen]

*)

lemmas permute_ktt[simp] = permute_rkind_permute_rty_permute_rtrm.simps[quot_lifted]

lemmas kind_ty_trm_inj = alpha_rkind_alpha_rty_alpha_rtrm_inj[unfolded alpha_gen, quot_lifted, folded alpha_gen]

lemmas fv_kind_ty_trm = fv_rkind_fv_rty_fv_rtrm.simps[quot_lifted]

lemmas fv_eqvt = rfv_eqvt[quot_lifted]

lemma supports:

  "{} supports TYP"

  "(supp (atom i)) supports (TCONST i)"

  "(supp A \<union> supp M) supports (TAPP A M)"

  "(supp (atom i)) supports (CONS i)"

  "(supp (atom x)) supports (VAR x)"

  "(supp M \<union> supp N) supports (APP M N)"

  "(supp ty \<union> supp (atom na) \<union> supp ki) supports (KPI ty na ki)"

  "(supp ty \<union> supp (atom na) \<union> supp ty2) supports (TPI ty na ty2)"

  "(supp ty \<union> supp (atom na) \<union> supp trm) supports (LAM ty na trm)"

apply(simp_all add: supports_def fresh_def[symmetric] swap_fresh_fresh)

apply(rule_tac [!] allI)+

apply(rule_tac [!] impI)

apply(tactic {* ALLGOALS (REPEAT o etac conjE) *})

apply(simp_all add: fresh_atom)

done

lemma kind_ty_trm_fs:

  "finite (supp (x\<Colon>kind))"

  "finite (supp (y\<Colon>ty))"

  "finite (supp (z\<Colon>trm))"

apply(induct x and y and z rule: kind_ty_trm_inducts)

apply(tactic {* ALLGOALS (rtac @{thm supports_finite} THEN' resolve_tac @{thms supports}) *})

apply(simp_all add: supp_atom)

done

instance kind and ty and trm :: fs

apply(default)

apply(simp_all only: kind_ty_trm_fs)

done

lemma supp_eqs:

  "supp TYP = {}"

  "supp rkind = fv_kind rkind \<Longrightarrow> supp (KPI rty name rkind) = supp rty \<union> supp (Abs {atom name} rkind)"

  "supp (TCONST i) = {atom i}"

  "supp (TAPP A M) = supp A \<union> supp M"

  "supp rty2 = fv_ty rty2 \<Longrightarrow> supp (TPI rty1 name rty2) = supp rty1 \<union> supp (Abs {atom name} rty2)"

  "supp (CONS i) = {atom i}"

  "supp (VAR x) = {atom x}"

  "supp (APP M N) = supp M \<union> supp N"

  "supp rtrm = fv_trm rtrm \<Longrightarrow> supp (LAM rty name rtrm) = supp rty \<union> supp (Abs {atom name} rtrm)"

  apply(simp_all (no_asm) add: supp_def)

  apply(simp_all only: kind_ty_trm_inj Abs_eq_iff alpha_gen)

  apply(simp_all only: insert_eqvt empty_eqvt atom_eqvt supp_eqvt[symmetric] fv_eqvt[symmetric])

  apply(simp_all add: Collect_imp_eq Collect_neg_eq[symmetric] Set.Un_commute)

  apply(simp_all add: supp_at_base[simplified supp_def])

  done

lemma supp_fv:

  "supp t1 = fv_kind t1"

  "supp t2 = fv_ty t2"

  "supp t3 = fv_trm t3"

  apply(induct t1 and t2 and t3 rule: kind_ty_trm_inducts)

  apply(simp_all (no_asm) only: supp_eqs fv_kind_ty_trm)

  apply(simp_all)

  apply(subst supp_eqs)

  apply(simp_all add: supp_Abs)

  apply(subst supp_eqs)

  apply(simp_all add: supp_Abs)

  apply(subst supp_eqs)

  apply(simp_all add: supp_Abs)

  done

lemma supp_rkind_rty_rtrm:

  "supp TYP = {}"

  "supp (KPI A x K) = supp A \<union> (supp K - {atom x})"

  "supp (TCONST i) = {atom i}"

  "supp (TAPP A M) = supp A \<union> supp M"

  "supp (TPI A x B) = supp A \<union> (supp B - {atom x})"

  "supp (CONS i) = {atom i}"

  "supp (VAR x) = {atom x}"

  "supp (APP M N) = supp M \<union> supp N"

  "supp (LAM A x M) = supp A \<union> (supp M - {atom x})"

  by (simp_all only: supp_fv fv_kind_ty_trm)

end