(* Title: HOLCF/Tools/pcpodef.ML
Author: Brian Huffman
Primitive domain definitions for HOLCF, similar to Gordon/HOL-style
typedef (see also ~~/src/HOL/Tools/typedef.ML).
*)
signature PCPODEF =
sig
type cpo_info =
{ below_def: thm, adm: thm, cont_Rep: thm, cont_Abs: thm,
lub: thm, thelub: thm, compact: thm }
type pcpo_info =
{ Rep_strict: thm, Abs_strict: thm, Rep_strict_iff: thm, Abs_strict_iff: thm,
Rep_defined: thm, Abs_defined: thm }
val add_podef: bool -> binding option -> binding * (string * sort) list * mixfix ->
term -> (binding * binding) option -> tactic -> theory ->
(Typedef.info * thm) * theory
val add_cpodef: bool -> binding option -> binding * (string * sort) list * mixfix ->
term -> (binding * binding) option -> tactic * tactic -> theory ->
(Typedef.info * cpo_info) * theory
val add_pcpodef: bool -> binding option -> binding * (string * sort) list * mixfix ->
term -> (binding * binding) option -> tactic * tactic -> theory ->
(Typedef.info * cpo_info * pcpo_info) * theory
val cpodef_proof: (bool * binding)
* (binding * (string * sort) list * mixfix) * term
* (binding * binding) option -> theory -> Proof.state
val cpodef_proof_cmd: (bool * binding)
* (binding * (string * string option) list * mixfix) * string
* (binding * binding) option -> theory -> Proof.state
val pcpodef_proof: (bool * binding)
* (binding * (string * sort) list * mixfix) * term
* (binding * binding) option -> theory -> Proof.state
val pcpodef_proof_cmd: (bool * binding)
* (binding * (string * string option) list * mixfix) * string
* (binding * binding) option -> theory -> Proof.state
end;
structure Pcpodef :> PCPODEF =
struct
(** type definitions **)
type cpo_info =
{ below_def: thm, adm: thm, cont_Rep: thm, cont_Abs: thm,
lub: thm, thelub: thm, compact: thm }
type pcpo_info =
{ Rep_strict: thm, Abs_strict: thm, Rep_strict_iff: thm, Abs_strict_iff: thm,
Rep_defined: thm, Abs_defined: thm }
(* building terms *)
fun adm_const T = Const (@{const_name adm}, (T --> HOLogic.boolT) --> HOLogic.boolT);
fun mk_adm (x, T, P) = adm_const T $ absfree (x, T, P);
fun below_const T = Const (@{const_name below}, T --> T --> HOLogic.boolT);
(* manipulating theorems *)
fun fold_adm_mem thm NONE = thm
| fold_adm_mem thm (SOME set_def) =
let val rule = @{lemma "A == B ==> adm (%x. x : B) ==> adm (%x. x : A)" by simp}
in rule OF [set_def, thm] end;
fun fold_UU_mem thm NONE = thm
| fold_UU_mem thm (SOME set_def) =
let val rule = @{lemma "A == B ==> UU : B ==> UU : A" by simp}
in rule OF [set_def, thm] end;
(* proving class instances *)
fun prove_cpo
(name: binding)
(newT: typ)
(Rep_name: binding, Abs_name: binding)
(type_definition: thm) (* type_definition Rep Abs A *)
(set_def: thm option) (* A == set *)
(below_def: thm) (* op << == %x y. Rep x << Rep y *)
(admissible: thm) (* adm (%x. x : set) *)
(thy: theory)
=
let
val admissible' = fold_adm_mem admissible set_def;
val cpo_thms = map (Thm.transfer thy) [type_definition, below_def, admissible'];
val (full_tname, Ts) = dest_Type newT;
val lhs_sorts = map (snd o dest_TFree) Ts;
val tac = Tactic.rtac (@{thm typedef_cpo} OF cpo_thms) 1;
val thy = AxClass.prove_arity (full_tname, lhs_sorts, @{sort cpo}) tac thy;
(* transfer thms so that they will know about the new cpo instance *)
val cpo_thms' = map (Thm.transfer thy) cpo_thms;
fun make thm = Drule.zero_var_indexes (thm OF cpo_thms');
val cont_Rep = make @{thm typedef_cont_Rep};
val cont_Abs = make @{thm typedef_cont_Abs};
val lub = make @{thm typedef_lub};
val thelub = make @{thm typedef_thelub};
val compact = make @{thm typedef_compact};
val (_, thy) =
thy
|> Sign.add_path (Binding.name_of name)
|> PureThy.add_thms
([((Binding.prefix_name "adm_" name, admissible'), []),
((Binding.prefix_name "cont_" Rep_name, cont_Rep ), []),
((Binding.prefix_name "cont_" Abs_name, cont_Abs ), []),
((Binding.prefix_name "lub_" name, lub ), []),
((Binding.prefix_name "thelub_" name, thelub ), []),
((Binding.prefix_name "compact_" name, compact ), [])])
||> Sign.parent_path;
val cpo_info : cpo_info =
{ below_def = below_def, adm = admissible', cont_Rep = cont_Rep,
cont_Abs = cont_Abs, lub = lub, thelub = thelub, compact = compact };
in
(cpo_info, thy)
end;
fun prove_pcpo
(name: binding)
(newT: typ)
(Rep_name: binding, Abs_name: binding)
(type_definition: thm) (* type_definition Rep Abs A *)
(set_def: thm option) (* A == set *)
(below_def: thm) (* op << == %x y. Rep x << Rep y *)
(UU_mem: thm) (* UU : set *)
(thy: theory)
=
let
val UU_mem' = fold_UU_mem UU_mem set_def;
val pcpo_thms = map (Thm.transfer thy) [type_definition, below_def, UU_mem'];
val (full_tname, Ts) = dest_Type newT;
val lhs_sorts = map (snd o dest_TFree) Ts;
val tac = Tactic.rtac (@{thm typedef_pcpo} OF pcpo_thms) 1;
val thy = AxClass.prove_arity (full_tname, lhs_sorts, @{sort pcpo}) tac thy;
val pcpo_thms' = map (Thm.transfer thy) pcpo_thms;
fun make thm = Drule.zero_var_indexes (thm OF pcpo_thms');
val Rep_strict = make @{thm typedef_Rep_strict};
val Abs_strict = make @{thm typedef_Abs_strict};
val Rep_strict_iff = make @{thm typedef_Rep_strict_iff};
val Abs_strict_iff = make @{thm typedef_Abs_strict_iff};
val Rep_defined = make @{thm typedef_Rep_defined};
val Abs_defined = make @{thm typedef_Abs_defined};
val (_, thy) =
thy
|> Sign.add_path (Binding.name_of name)
|> PureThy.add_thms
([((Binding.suffix_name "_strict" Rep_name, Rep_strict), []),
((Binding.suffix_name "_strict" Abs_name, Abs_strict), []),
((Binding.suffix_name "_strict_iff" Rep_name, Rep_strict_iff), []),
((Binding.suffix_name "_strict_iff" Abs_name, Abs_strict_iff), []),
((Binding.suffix_name "_defined" Rep_name, Rep_defined), []),
((Binding.suffix_name "_defined" Abs_name, Abs_defined), [])])
||> Sign.parent_path;
val pcpo_info =
{ Rep_strict = Rep_strict, Abs_strict = Abs_strict,
Rep_strict_iff = Rep_strict_iff, Abs_strict_iff = Abs_strict_iff,
Rep_defined = Rep_defined, Abs_defined = Abs_defined };
in
(pcpo_info, thy)
end;
(* prepare_cpodef *)
fun declare_type_name a =
Variable.declare_constraints (Logic.mk_type (TFree (a, dummyS)));
fun prepare prep_term name (tname, raw_args, mx) raw_set opt_morphs thy =
let
val _ = Theory.requires thy "Pcpodef" "pcpodefs";
(*rhs*)
val tmp_ctxt =
ProofContext.init_global thy
|> fold (Variable.declare_typ o TFree) raw_args;
val set = prep_term tmp_ctxt raw_set;
val tmp_ctxt' = tmp_ctxt |> Variable.declare_term set;
val setT = Term.fastype_of set;
val oldT = HOLogic.dest_setT setT handle TYPE _ =>
error ("Not a set type: " ^ quote (Syntax.string_of_typ tmp_ctxt setT));
(*lhs*)
val lhs_tfrees = map (ProofContext.check_tfree tmp_ctxt') raw_args;
val full_tname = Sign.full_name thy tname;
val newT = Type (full_tname, map TFree lhs_tfrees);
val morphs = opt_morphs
|> the_default (Binding.prefix_name "Rep_" name, Binding.prefix_name "Abs_" name);
in
(newT, oldT, set, morphs)
end
fun add_podef def opt_name typ set opt_morphs tac thy =
let
val name = the_default (#1 typ) opt_name;
val ((full_tname, info as ({Rep_name, ...}, {type_definition, set_def, ...})), thy2) = thy
|> Typedef.add_typedef_global def opt_name typ set opt_morphs tac;
val oldT = #rep_type (#1 info);
val newT = #abs_type (#1 info);
val lhs_tfrees = map dest_TFree (snd (dest_Type newT));
val RepC = Const (Rep_name, newT --> oldT);
val below_eqn = Logic.mk_equals (below_const newT,
Abs ("x", newT, Abs ("y", newT, below_const oldT $ (RepC $ Bound 1) $ (RepC $ Bound 0))));
val lthy3 = thy2
|> Class.instantiation ([full_tname], lhs_tfrees, @{sort po});
val ((_, (_, below_ldef)), lthy4) = lthy3
|> Specification.definition (NONE,
((Binding.prefix_name "below_" (Binding.suffix_name "_def" name), []), below_eqn));
val ctxt_thy = ProofContext.init_global (ProofContext.theory_of lthy4);
val below_def = singleton (ProofContext.export lthy4 ctxt_thy) below_ldef;
val thy5 = lthy4
|> Class.prove_instantiation_instance
(K (Tactic.rtac (@{thm typedef_po} OF [type_definition, below_def]) 1))
|> Local_Theory.exit_global;
in ((info, below_def), thy5) end;
fun prepare_cpodef
(prep_term: Proof.context -> 'a -> term)
(def: bool)
(name: binding)
(typ: binding * (string * sort) list * mixfix)
(raw_set: 'a)
(opt_morphs: (binding * binding) option)
(thy: theory)
: term * term * (thm -> thm -> theory -> (Typedef.info * cpo_info) * theory) =
let
val (newT, oldT, set, morphs as (Rep_name, Abs_name)) =
prepare prep_term name typ raw_set opt_morphs thy;
val goal_nonempty =
HOLogic.mk_Trueprop (HOLogic.mk_exists ("x", oldT, HOLogic.mk_mem (Free ("x", oldT), set)));
val goal_admissible =
HOLogic.mk_Trueprop (mk_adm ("x", oldT, HOLogic.mk_mem (Free ("x", oldT), set)));
fun cpodef_result nonempty admissible thy =
let
val ((info as (_, {type_definition, set_def, ...}), below_def), thy2) = thy
|> add_podef def (SOME name) typ set opt_morphs (Tactic.rtac nonempty 1);
val (cpo_info, thy3) = thy2
|> prove_cpo name newT morphs type_definition set_def below_def admissible;
in
((info, cpo_info), thy3)
end;
in
(goal_nonempty, goal_admissible, cpodef_result)
end
handle ERROR msg =>
cat_error msg ("The error(s) above occurred in cpodef " ^ quote (Binding.str_of name));
fun prepare_pcpodef
(prep_term: Proof.context -> 'a -> term)
(def: bool)
(name: binding)
(typ: binding * (string * sort) list * mixfix)
(raw_set: 'a)
(opt_morphs: (binding * binding) option)
(thy: theory)
: term * term * (thm -> thm -> theory -> (Typedef.info * cpo_info * pcpo_info) * theory) =
let
val (newT, oldT, set, morphs as (Rep_name, Abs_name)) =
prepare prep_term name typ raw_set opt_morphs thy;
val goal_UU_mem =
HOLogic.mk_Trueprop (HOLogic.mk_mem (Const (@{const_name UU}, oldT), set));
val goal_admissible =
HOLogic.mk_Trueprop (mk_adm ("x", oldT, HOLogic.mk_mem (Free ("x", oldT), set)));
fun pcpodef_result UU_mem admissible thy =
let
val tac = Tactic.rtac exI 1 THEN Tactic.rtac UU_mem 1;
val ((info as (_, {type_definition, set_def, ...}), below_def), thy2) = thy
|> add_podef def (SOME name) typ set opt_morphs tac;
val (cpo_info, thy3) = thy2
|> prove_cpo name newT morphs type_definition set_def below_def admissible;
val (pcpo_info, thy4) = thy3
|> prove_pcpo name newT morphs type_definition set_def below_def UU_mem;
in
((info, cpo_info, pcpo_info), thy4)
end;
in
(goal_UU_mem, goal_admissible, pcpodef_result)
end
handle ERROR msg =>
cat_error msg ("The error(s) above occurred in pcpodef " ^ quote (Binding.str_of name));
(* tactic interface *)
fun add_cpodef def opt_name typ set opt_morphs (tac1, tac2) thy =
let
val name = the_default (#1 typ) opt_name;
val (goal1, goal2, cpodef_result) =
prepare_cpodef Syntax.check_term def name typ set opt_morphs thy;
val thm1 = Goal.prove_global thy [] [] goal1 (K tac1)
handle ERROR msg => cat_error msg
("Failed to prove non-emptiness of " ^ quote (Syntax.string_of_term_global thy set));
val thm2 = Goal.prove_global thy [] [] goal2 (K tac2)
handle ERROR msg => cat_error msg
("Failed to prove admissibility of " ^ quote (Syntax.string_of_term_global thy set));
in cpodef_result thm1 thm2 thy end;
fun add_pcpodef def opt_name typ set opt_morphs (tac1, tac2) thy =
let
val name = the_default (#1 typ) opt_name;
val (goal1, goal2, pcpodef_result) =
prepare_pcpodef Syntax.check_term def name typ set opt_morphs thy;
val thm1 = Goal.prove_global thy [] [] goal1 (K tac1)
handle ERROR msg => cat_error msg
("Failed to prove non-emptiness of " ^ quote (Syntax.string_of_term_global thy set));
val thm2 = Goal.prove_global thy [] [] goal2 (K tac2)
handle ERROR msg => cat_error msg
("Failed to prove admissibility of " ^ quote (Syntax.string_of_term_global thy set));
in pcpodef_result thm1 thm2 thy end;
(* proof interface *)
local
fun gen_cpodef_proof prep_term prep_constraint
((def, name), (b, raw_args, mx), set, opt_morphs) thy =
let
val ctxt = ProofContext.init_global thy;
val args = map (apsnd (prep_constraint ctxt)) raw_args;
val (goal1, goal2, make_result) =
prepare_cpodef prep_term def name (b, args, mx) set opt_morphs thy;
fun after_qed [[th1, th2]] = ProofContext.theory (snd o make_result th1 th2)
| after_qed _ = raise Fail "cpodef_proof";
in Proof.theorem NONE after_qed [[(goal1, []), (goal2, [])]] ctxt end;
fun gen_pcpodef_proof prep_term prep_constraint
((def, name), (b, raw_args, mx), set, opt_morphs) thy =
let
val ctxt = ProofContext.init_global thy;
val args = map (apsnd (prep_constraint ctxt)) raw_args;
val (goal1, goal2, make_result) =
prepare_pcpodef prep_term def name (b, args, mx) set opt_morphs thy;
fun after_qed [[th1, th2]] = ProofContext.theory (snd o make_result th1 th2)
| after_qed _ = raise Fail "pcpodef_proof";
in Proof.theorem NONE after_qed [[(goal1, []), (goal2, [])]] ctxt end;
in
fun cpodef_proof x = gen_cpodef_proof Syntax.check_term (K I) x;
fun cpodef_proof_cmd x = gen_cpodef_proof Syntax.read_term Typedecl.read_constraint x;
fun pcpodef_proof x = gen_pcpodef_proof Syntax.check_term (K I) x;
fun pcpodef_proof_cmd x = gen_pcpodef_proof Syntax.read_term Typedecl.read_constraint x;
end;
(** outer syntax **)
val typedef_proof_decl =
Scan.optional (Parse.$$$ "(" |--
((Parse.$$$ "open" >> K false) -- Scan.option Parse.binding ||
Parse.binding >> (fn s => (true, SOME s)))
--| Parse.$$$ ")") (true, NONE) --
(Parse.type_args_constrained -- Parse.binding) -- Parse.opt_mixfix --
(Parse.$$$ "=" |-- Parse.term) --
Scan.option (Parse.$$$ "morphisms" |-- Parse.!!! (Parse.binding -- Parse.binding));
fun mk_pcpodef_proof pcpo ((((((def, opt_name), (args, t)), mx), A), morphs)) =
(if pcpo then pcpodef_proof_cmd else cpodef_proof_cmd)
((def, the_default t opt_name), (t, args, mx), A, morphs);
val _ =
Outer_Syntax.command "pcpodef" "HOLCF type definition (requires admissibility proof)"
Keyword.thy_goal
(typedef_proof_decl >>
(Toplevel.print oo (Toplevel.theory_to_proof o mk_pcpodef_proof true)));
val _ =
Outer_Syntax.command "cpodef" "HOLCF type definition (requires admissibility proof)"
Keyword.thy_goal
(typedef_proof_decl >>
(Toplevel.print oo (Toplevel.theory_to_proof o mk_pcpodef_proof false)));
end;