(* Title: HOL/Tools/record_package.ML
ID: $Id$
Author: Wolfgang Naraschewski and Markus Wenzel, TU Muenchen
Extensible records with structural subtyping in HOL.
*)
signature BASIC_RECORD_PACKAGE =
sig
val record_simproc: simproc
val record_split_tac: int -> tactic
val record_split_name: string
val record_split_wrapper: string * wrapper
end;
signature RECORD_PACKAGE =
sig
include BASIC_RECORD_PACKAGE
val quiet_mode: bool ref
val moreS: sort
val mk_fieldT: (string * typ) * typ -> typ
val dest_fieldT: typ -> (string * typ) * typ
val mk_field: (string * term) * term -> term
val mk_fst: term -> term
val mk_snd: term -> term
val mk_recordT: (string * typ) list * typ -> typ
val dest_recordT: typ -> (string * typ) list * typ
val mk_record: (string * term) list * term -> term
val mk_sel: term -> string -> term
val mk_update: term -> string * term -> term
val print_records: theory -> unit
val add_record: (string list * bstring) -> string option
-> (bstring * string) list -> theory -> theory * {simps: thm list, iffs: thm list}
val add_record_i: (string list * bstring) -> (typ list * string) option
-> (bstring * typ) list -> theory -> theory * {simps: thm list, iffs: thm list}
val setup: (theory -> theory) list
end;
structure RecordPackage: RECORD_PACKAGE =
struct
(*** utilities ***)
(* messages *)
val quiet_mode = ref false;
fun message s = if ! quiet_mode then () else writeln s;
(* definitions and equations *)
infix 0 :== ===;
val (op :==) = Logic.mk_defpair;
val (op ===) = HOLogic.mk_Trueprop o HOLogic.mk_eq;
fun get_defs thy specs = map (PureThy.get_thm thy o fst) specs;
(* proof by simplification *)
fun prove_simp sign ss tacs simps =
let
val ss' = Simplifier.addsimps (ss, simps);
fun prove goal =
Goals.prove_goalw_cterm [] (Thm.cterm_of sign goal)
(K (tacs @ [ALLGOALS (Simplifier.simp_tac ss')]))
handle ERROR => error ("The error(s) above occurred while trying to prove "
^ quote (Sign.string_of_term sign goal));
in prove end;
(*** syntax operations ***)
(** name components **)
val moreN = "more";
val schemeN = "_scheme";
val fieldN = "_field";
val raw_fieldN = "_raw_field";
val field_typeN = "_field_type";
val fstN = "_val";
val sndN = "_more";
val updateN = "_update";
val makeN = "make";
val make_schemeN = "make_scheme";
(*see datatype package*)
val caseN = "_case";
(** generic operations **)
(* adhoc priming of vars *)
fun prime (Free (x, T)) = Free (x ^ "'", T)
| prime t = raise TERM ("prime: no free variable", [t]);
(* product case *)
fun fst_fn T U = Abs ("x", T, Abs ("y", U, Bound 1));
fun snd_fn T U = Abs ("x", T, Abs ("y", U, Bound 0));
fun mk_prod_case name f p =
let
val fT as Type ("fun", [A, Type ("fun", [B, C])]) = fastype_of f;
val pT = fastype_of p;
in Const (suffix caseN name, fT --> pT --> C) $ f $ p end;
(** tuple operations **)
(* more type class *)
val moreS = ["Record.more"];
(* types *)
fun mk_fieldT ((c, T), U) = Type (suffix field_typeN c, [T, U]);
fun dest_fieldT (typ as Type (c_field_type, [T, U])) =
(case try (unsuffix field_typeN) c_field_type of
None => raise TYPE ("dest_fieldT", [typ], [])
| Some c => ((c, T), U))
| dest_fieldT typ = raise TYPE ("dest_fieldT", [typ], []);
(* constructors *)
fun mk_fieldC U (c, T) = (suffix fieldN c, T --> U --> mk_fieldT ((c, T), U));
fun gen_mk_field sfx ((c, t), u) =
let val T = fastype_of t and U = fastype_of u
in Const (suffix sfx c, [T, U] ---> mk_fieldT ((c, T), U)) $ t $ u end;
val mk_field = gen_mk_field fieldN;
val mk_raw_field = gen_mk_field raw_fieldN;
(* destructors *)
fun mk_fstC U (c, T) = (suffix fstN c, mk_fieldT ((c, T), U) --> T);
fun mk_sndC U (c, T) = (suffix sndN c, mk_fieldT ((c, T), U) --> U);
fun dest_field fst_or_snd p =
let
val pT = fastype_of p;
val ((c, T), U) = dest_fieldT pT;
val (destN, destT) = if fst_or_snd then (fstN, T) else (sndN, U);
in Const (suffix destN c, pT --> destT) $ p end;
val mk_fst = dest_field true;
val mk_snd = dest_field false;
(** record operations **)
(* types *)
val mk_recordT = foldr mk_fieldT;
fun dest_recordT T =
(case try dest_fieldT T of
None => ([], T)
| Some (c_T, U) => apfst (cons c_T) (dest_recordT U));
fun find_fieldT c rT =
(case assoc (fst (dest_recordT rT), c) of
None => raise TYPE ("find_field: " ^ c, [rT], [])
| Some T => T);
(* constructors *)
val mk_record = foldr mk_field;
(* selectors *)
fun mk_selC rT (c, T) = (c, rT --> T);
fun mk_sel r c =
let val rT = fastype_of r
in Const (mk_selC rT (c, find_fieldT c rT)) $ r end;
val mk_moreC = mk_selC;
fun mk_more r c =
let val rT = fastype_of r
in Const (mk_moreC rT (c, snd (dest_recordT rT))) $ r end;
(* updates *)
fun mk_updateC rT (c, T) = (suffix updateN c, T --> rT --> rT);
fun mk_update r (c, x) =
let val rT = fastype_of r
in Const (mk_updateC rT (c, find_fieldT c rT)) $ x $ r end;
val mk_more_updateC = mk_updateC;
fun mk_more_update r (c, x) =
let val rT = fastype_of r
in Const (mk_more_updateC rT (c, snd (dest_recordT rT))) $ x $ r end;
(* make *)
fun mk_makeC rT (c, Ts) = (c, Ts ---> rT);
(** concrete syntax for records **)
(* parse translations *)
fun gen_field_tr mark sfx (t as Const (c, _) $ Free (name, _) $ arg) =
if c = mark then Syntax.const (suffix sfx name) $ arg
else raise TERM ("gen_field_tr: " ^ mark, [t])
| gen_field_tr mark _ t = raise TERM ("gen_field_tr: " ^ mark, [t]);
fun gen_fields_tr sep mark sfx (tm as Const (c, _) $ t $ u) =
if c = sep then gen_field_tr mark sfx t :: gen_fields_tr sep mark sfx u
else [gen_field_tr mark sfx tm]
| gen_fields_tr _ mark sfx tm = [gen_field_tr mark sfx tm];
fun gen_record_tr sep mark sfx unit [t] = foldr (op $) (gen_fields_tr sep mark sfx t, unit)
| gen_record_tr _ _ _ _ ts = raise TERM ("gen_record_tr", ts);
fun gen_record_scheme_tr sep mark sfx [t, more] = foldr (op $) (gen_fields_tr sep mark sfx t, more)
| gen_record_scheme_tr _ _ _ ts = raise TERM ("gen_record_scheme_tr", ts);
val record_type_tr = gen_record_tr "_field_types" "_field_type" field_typeN (Syntax.const "unit");
val record_type_scheme_tr = gen_record_scheme_tr "_field_types" "_field_type" field_typeN;
val record_tr = gen_record_tr "_fields" "_field" fieldN HOLogic.unit;
val record_scheme_tr = gen_record_scheme_tr "_fields" "_field" fieldN;
fun record_update_tr [t, u] =
foldr (op $) (rev (gen_fields_tr "_updates" "_update" updateN u), t)
| record_update_tr ts = raise TERM ("record_update_tr", ts);
val parse_translation =
[("_record_type", record_type_tr),
("_record_type_scheme", record_type_scheme_tr),
("_record", record_tr),
("_record_scheme", record_scheme_tr),
("_record_update", record_update_tr)];
(* print translations *)
fun gen_fields_tr' mark sfx (tm as Const (name_field, _) $ t $ u) =
(case try (unsuffix sfx) name_field of
Some name =>
apfst (cons (Syntax.const mark $ Syntax.free name $ t)) (gen_fields_tr' mark sfx u)
| None => ([], tm))
| gen_fields_tr' _ _ tm = ([], tm);
fun gen_record_tr' sep mark sfx is_unit record record_scheme tm =
let
val (ts, u) = gen_fields_tr' mark sfx tm;
val t' = foldr1 (fn (v, w) => Syntax.const sep $ v $ w) ts;
in
if is_unit u then Syntax.const record $ t'
else Syntax.const record_scheme $ t' $ u
end;
val record_type_tr' =
gen_record_tr' "_field_types" "_field_type" field_typeN
(fn Const ("unit", _) => true | _ => false) "_record_type" "_record_type_scheme";
val record_tr' =
gen_record_tr' "_fields" "_field" fieldN HOLogic.is_unit "_record" "_record_scheme";
fun record_update_tr' tm =
let val (ts, u) = gen_fields_tr' "_update" updateN tm in
Syntax.const "_record_update" $ u $
foldr1 (fn (v, w) => Syntax.const "_updates" $ v $ w) (rev ts)
end;
fun gen_field_tr' sfx tr' name =
let val name_sfx = suffix sfx name
in (name_sfx, fn [t, u] => tr' (Syntax.const name_sfx $ t $ u) | _ => raise Match) end;
fun print_translation names =
map (gen_field_tr' field_typeN record_type_tr') names @
map (gen_field_tr' fieldN record_tr') names @
map (gen_field_tr' updateN record_update_tr') names;
(*** extend theory by record definition ***)
(** record info **)
(* type record_info and parent_info *)
type record_info =
{args: (string * sort) list,
parent: (typ list * string) option,
fields: (string * typ) list,
simps: thm list};
type parent_info =
{name: string,
fields: (string * typ) list,
simps: thm list};
(* data kind 'HOL/records' *)
type record_data =
{records: record_info Symtab.table,
sel_upd:
{selectors: unit Symtab.table,
updates: string Symtab.table,
simpset: Simplifier.simpset},
field_splits:
{fields: unit Symtab.table,
simpset: Simplifier.simpset}};
fun make_record_data records sel_upd field_splits =
{records = records, sel_upd = sel_upd, field_splits = field_splits}: record_data;
structure RecordsArgs =
struct
val name = "HOL/records";
type T = record_data;
val empty =
make_record_data Symtab.empty
{selectors = Symtab.empty, updates = Symtab.empty, simpset = HOL_basic_ss}
{fields = Symtab.empty, simpset = HOL_basic_ss};
val copy = I;
val prep_ext = I;
fun merge
({records = recs1,
sel_upd = {selectors = sels1, updates = upds1, simpset = ss1},
field_splits = {fields = flds1, simpset = fld_ss1}},
{records = recs2,
sel_upd = {selectors = sels2, updates = upds2, simpset = ss2},
field_splits = {fields = flds2, simpset = fld_ss2}}) =
make_record_data
(Symtab.merge (K true) (recs1, recs2))
{selectors = Symtab.merge (K true) (sels1, sels2),
updates = Symtab.merge (K true) (upds1, upds2),
simpset = Simplifier.merge_ss (ss1, ss2)}
{fields = Symtab.merge (K true) (flds1, flds2),
simpset = Simplifier.merge_ss (fld_ss1, fld_ss2)};
fun print sg ({records = recs, ...}: record_data) =
let
val prt_typ = Sign.pretty_typ sg;
val ext_const = Sign.cond_extern sg Sign.constK;
fun pretty_parent None = []
| pretty_parent (Some (Ts, name)) =
[Pretty.block [prt_typ (Type (name, Ts)), Pretty.str " +"]];
fun pretty_field (c, T) = Pretty.block
[Pretty.str (ext_const c), Pretty.str " ::", Pretty.brk 1, Pretty.quote (prt_typ T)];
fun pretty_record (name, {args, parent, fields, simps = _}) = Pretty.block (Pretty.fbreaks
(Pretty.block [prt_typ (Type (name, map TFree args)), Pretty.str " = "] ::
pretty_parent parent @ map pretty_field fields));
in seq (Pretty.writeln o pretty_record) (Sign.cond_extern_table sg Sign.typeK recs) end;
end;
structure RecordsData = TheoryDataFun(RecordsArgs);
val print_records = RecordsData.print;
(* access 'records' *)
fun get_record thy name = Symtab.lookup (#records (RecordsData.get thy), name);
fun put_record name info thy =
let
val {records, sel_upd, field_splits} = RecordsData.get thy;
val data = make_record_data (Symtab.update ((name, info), records)) sel_upd field_splits;
in RecordsData.put data thy end;
(* access 'sel_upd' *)
fun get_sel_upd sg = #sel_upd (RecordsData.get_sg sg);
fun get_selectors sg name = Symtab.lookup (#selectors (get_sel_upd sg), name);
fun get_updates sg name = Symtab.lookup (#updates (get_sel_upd sg), name);
fun get_simpset sg = #simpset (get_sel_upd sg);
fun put_sel_upd names simps thy =
let
val sels = map (rpair ()) names;
val upds = map (suffix updateN) names ~~ names;
val {records, sel_upd = {selectors, updates, simpset}, field_splits} = RecordsData.get thy;
val data = make_record_data records
{selectors = Symtab.extend (selectors, sels),
updates = Symtab.extend (updates, upds),
simpset = Simplifier.addsimps (simpset, simps)}
field_splits;
in RecordsData.put data thy end;
(* access 'field_splits' *)
fun add_record_splits splits thy =
let
val {records, sel_upd, field_splits = {fields, simpset}} = RecordsData.get thy;
val flds = map (rpair () o fst) splits;
val simps = map snd splits;
val data = make_record_data records sel_upd
{fields = Symtab.extend (fields, flds), simpset = Simplifier.addsimps (simpset, simps)};
in RecordsData.put data thy end;
(* parent records *)
fun inst_record thy (types, name) =
let
val sign = Theory.sign_of thy;
fun err msg = error (msg ^ " parent record " ^ quote name);
val {args, parent, fields, simps} =
(case get_record thy name of Some info => info | None => err "Unknown");
val _ = if length types <> length args then err "Bad number of arguments for" else ();
fun bad_inst ((x, S), T) =
if Sign.of_sort sign (T, S) then None else Some x
val bads = mapfilter bad_inst (args ~~ types);
val inst = map fst args ~~ types;
val subst = Term.map_type_tfree (fn (x, _) => the (assoc (inst, x)));
in
if not (null bads) then
err ("Ill-sorted instantiation of " ^ commas bads ^ " in")
else (apsome (apfst (map subst)) parent, map (apsnd subst) fields, simps)
end;
fun add_parents thy (None, parents) = parents
| add_parents thy (Some (types, name), parents) =
let val (pparent, pfields, psimps) = inst_record thy (types, name)
in add_parents thy (pparent, {name = name, fields = pfields, simps = psimps} :: parents) end;
(** record simproc **)
local
val sel_upd_pat = [Thm.read_cterm (Theory.sign_of HOL.thy) ("s (u k r)", HOLogic.termT)];
fun proc sg _ t =
(case t of (sel as Const (s, _)) $ ((upd as Const (u, _)) $ k $ r) =>
(case get_selectors sg s of Some () =>
(case get_updates sg u of Some u_name =>
let
fun atomize x t = Free (x, fastype_of t);
val k' = atomize "k" k;
val r' = atomize "r" r;
val t' = sel $ (upd $ k' $ r');
val prove = mk_meta_eq o prove_simp sg (get_simpset sg) [] [];
in
if u_name = s then Some (prove (t' === k'))
else Some (prove (t' === sel $ r'))
end
| None => None)
| None => None)
| _ => None);
in
val record_simproc = Simplifier.mk_simproc "record_simp" sel_upd_pat proc;
end;
(** record field splitting **)
(* tactic *)
fun record_split_tac i st =
let
val {field_splits = {fields, simpset}, ...} = RecordsData.get_sg (Thm.sign_of_thm st);
fun is_fieldT (_, Type (a, [_, _])) = is_some (Symtab.lookup (fields, a))
| is_fieldT _ = false;
val params = Logic.strip_params (Library.nth_elem (i - 1, Thm.prems_of st));
in
if exists is_fieldT params then Simplifier.full_simp_tac simpset i st
else Seq.empty
end handle Library.LIST _ => Seq.empty;
(* wrapper *)
val record_split_name = "record_split_tac";
val record_split_wrapper = (record_split_name, fn tac => record_split_tac ORELSE' tac);
(* method *)
val record_split_method =
("record_split", Method.no_args (Method.METHOD0 (HEADGOAL record_split_tac)),
"split record fields");
(** internal theory extenders **)
(* field_type_defs *)
fun field_type_def ((thy, simps), (name, tname, vs, T, U)) =
let
val full = Sign.full_name (Theory.sign_of thy);
val (thy', {simps = simps', ...}) =
thy
|> setmp DatatypePackage.quiet_mode true
(DatatypePackage.add_datatype_i true [tname]
[(vs, tname, Syntax.NoSyn, [(name, [T, U], Syntax.NoSyn)])]);
val thy'' =
thy'
|> setmp AxClass.quiet_mode true
(AxClass.add_inst_arity_i (full tname, [HOLogic.termS, moreS], moreS) [] [] None);
in (thy'', simps' @ simps) end;
fun field_type_defs args thy = foldl field_type_def ((thy, []), args);
(* field_definitions *)
fun field_definitions fields names zeta moreT more vars named_vars thy =
let
val sign = Theory.sign_of thy;
val base = Sign.base_name;
val full_path = Sign.full_name_path sign;
(* prepare declarations and definitions *)
(*field types*)
fun mk_fieldT_spec c =
(suffix raw_fieldN c, suffix field_typeN c,
["'a", zeta], TFree ("'a", HOLogic.termS), moreT);
val fieldT_specs = map (mk_fieldT_spec o base) names;
(*field constructors*)
val field_decls = map (mk_fieldC moreT) fields;
fun mk_field_spec (c, v) =
mk_field ((c, v), more) :== mk_raw_field ((c, v), more);
val field_specs = map mk_field_spec named_vars;
(*field destructors*)
val dest_decls = map (mk_fstC moreT) fields @ map (mk_sndC moreT) fields;
fun mk_dest_spec dest f (c, T) =
let val p = Free ("p", mk_fieldT ((c, T), moreT));
in dest p :== mk_prod_case (suffix field_typeN c) (f T moreT) p end;
val dest_specs =
map (mk_dest_spec mk_fst fst_fn) fields @
map (mk_dest_spec mk_snd snd_fn) fields;
(* prepare theorems *)
(*constructor injects*)
fun mk_inject_prop (c, v) =
HOLogic.mk_eq (mk_field ((c, v), more), mk_field ((c, prime v), prime more)) ===
(HOLogic.conj $ HOLogic.mk_eq (v, prime v) $ HOLogic.mk_eq (more, prime more));
val inject_props = map mk_inject_prop named_vars;
(*destructor conversions*)
fun mk_dest_prop dest dest' (c, v) =
dest (mk_field ((c, v), more)) === dest' (v, more);
val dest_props =
map (mk_dest_prop mk_fst fst) named_vars @
map (mk_dest_prop mk_snd snd) named_vars;
(*surjective pairing*)
fun mk_surj_prop (c, T) =
let val p = Free ("p", mk_fieldT ((c, T), moreT));
in p === mk_field ((c, mk_fst p), mk_snd p) end;
val surj_props = map mk_surj_prop fields;
(* 1st stage: types_thy *)
val (types_thy, datatype_simps) =
thy
|> field_type_defs fieldT_specs;
(* 2nd stage: defs_thy *)
val defs_thy =
types_thy
|> (Theory.add_consts_i o map (Syntax.no_syn o apfst base))
(field_decls @ dest_decls)
|> (PureThy.add_defs_i o map (fn x => (x, [Drule.tag_internal])))
(field_specs @ dest_specs);
val field_defs = get_defs defs_thy field_specs;
val dest_defs = get_defs defs_thy dest_specs;
(* 3rd stage: thms_thy *)
val prove = prove_simp (Theory.sign_of defs_thy) HOL_basic_ss;
val prove_std = prove [] (field_defs @ dest_defs @ datatype_simps);
val field_injects = map prove_std inject_props;
val dest_convs = map prove_std dest_props;
val surj_pairs = map (prove [DatatypePackage.induct_tac "p" 1]
(map Thm.symmetric field_defs @ dest_convs)) surj_props;
fun mk_split th = SplitPairedAll.rule (th RS eq_reflection);
val field_splits = map mk_split surj_pairs;
val thms_thy =
defs_thy
|> (PureThy.add_thmss o map Thm.no_attributes)
[("field_defs", field_defs),
("dest_defs", dest_defs),
("dest_convs", dest_convs),
("surj_pairs", surj_pairs),
("field_splits", field_splits)];
in (thms_thy, dest_convs, field_injects, field_splits) end;
(* record_definition *)
fun record_definition (args, bname) parent (parents: parent_info list) bfields thy =
let
val sign = Theory.sign_of thy;
val full = Sign.full_name_path sign bname;
val base = Sign.base_name;
(* basic components *)
val alphas = map fst args;
val name = Sign.full_name sign bname; (*not made part of record name space!*)
val parent_fields = flat (map #fields parents);
val parent_names = map fst parent_fields;
val parent_types = map snd parent_fields;
val parent_len = length parent_fields;
val parent_xs = variantlist (map (base o fst) parent_fields, [moreN]);
val parent_vars = ListPair.map Free (parent_xs, parent_types);
val parent_named_vars = parent_names ~~ parent_vars;
val fields = map (apfst full) bfields;
val names = map fst fields;
val types = map snd fields;
val len = length fields;
val xs = variantlist (map fst bfields, moreN :: parent_xs);
val vars = ListPair.map Free (xs, types);
val named_vars = names ~~ vars;
val all_fields = parent_fields @ fields;
val all_names = parent_names @ names;
val all_types = parent_types @ types;
val all_len = parent_len + len;
val all_xs = parent_xs @ xs;
val all_vars = parent_vars @ vars;
val all_named_vars = parent_named_vars @ named_vars;
val zeta = variant alphas "'z";
val moreT = TFree (zeta, moreS);
val more = Free (moreN, moreT);
val full_moreN = full moreN;
fun more_part t = mk_more t full_moreN;
fun more_part_update t x = mk_more_update t (full_moreN, x);
val parent_more = funpow parent_len mk_snd;
val idxs = 0 upto (len - 1);
val rec_schemeT = mk_recordT (all_fields, moreT);
val rec_scheme = mk_record (all_named_vars, more);
val r = Free ("r", rec_schemeT);
val recT = mk_recordT (all_fields, HOLogic.unitT);
(* prepare print translation functions *)
val field_tr's =
print_translation (distinct (flat (map NameSpace.accesses (full_moreN :: names))));
(* prepare declarations *)
val sel_decls = map (mk_selC rec_schemeT) bfields @
[mk_moreC rec_schemeT (moreN, moreT)];
val update_decls = map (mk_updateC rec_schemeT) bfields @
[mk_more_updateC rec_schemeT (moreN, moreT)];
val make_decls =
[(mk_makeC rec_schemeT (make_schemeN, all_types @ [moreT])),
(mk_makeC recT (makeN, all_types))];
(* prepare definitions *)
(*record (scheme) type abbreviation*)
val recordT_specs =
[(suffix schemeN bname, alphas @ [zeta], rec_schemeT, Syntax.NoSyn),
(bname, alphas, recT, Syntax.NoSyn)];
(*selectors*)
fun mk_sel_spec (i, c) =
mk_sel r c :== mk_fst (funpow i mk_snd (parent_more r));
val sel_specs =
ListPair.map mk_sel_spec (idxs, names) @
[more_part r :== funpow len mk_snd (parent_more r)];
(*updates*)
val all_sels = all_names ~~ map (mk_sel r) all_names;
fun mk_upd_spec (i, (c, x)) =
mk_update r (c, x) :==
mk_record (nth_update (c, x) (parent_len + i, all_sels), more_part r)
val update_specs =
ListPair.map mk_upd_spec (idxs, named_vars) @
[more_part_update r more :== mk_record (all_sels, more)];
(*makes*)
val make_scheme = Const (mk_makeC rec_schemeT (full make_schemeN, all_types @ [moreT]));
val make = Const (mk_makeC recT (full makeN, all_types));
val make_specs =
[list_comb (make_scheme, all_vars) $ more :== rec_scheme,
list_comb (make, all_vars) :== mk_record (all_named_vars, HOLogic.unit)];
(* prepare propositions *)
(*selectors*)
val sel_props =
map (fn (c, x) => mk_sel rec_scheme c === x) named_vars @
[more_part rec_scheme === more];
(*updates*)
fun mk_upd_prop (i, (c, T)) =
let val x' = Free (variant all_xs (base c ^ "'"), T) in
mk_update rec_scheme (c, x') ===
mk_record (nth_update (c, x') (parent_len + i, all_named_vars), more)
end;
val update_props =
ListPair.map mk_upd_prop (idxs, fields) @
let val more' = Free (variant all_xs (moreN ^ "'"), moreT)
in [more_part_update rec_scheme more' === mk_record (all_named_vars, more')] end;
(* 1st stage: fields_thy *)
val (fields_thy, field_simps, field_injects, field_splits) =
thy
|> Theory.add_path bname
|> field_definitions fields names zeta moreT more vars named_vars;
val named_splits = map2 (fn (c, th) => (suffix field_typeN c, th)) (names, field_splits);
(* 2nd stage: defs_thy *)
val defs_thy =
fields_thy
|> Theory.parent_path
|> Theory.add_tyabbrs_i recordT_specs (*not made part of record name space!*)
|> Theory.add_path bname
|> Theory.add_trfuns ([], [], field_tr's, [])
|> (Theory.add_consts_i o map Syntax.no_syn)
(sel_decls @ update_decls @ make_decls)
|> (PureThy.add_defs_i o map (fn x => (x, [Drule.tag_internal])))
(sel_specs @ update_specs)
|> (PureThy.add_defs_i o map Thm.no_attributes) make_specs;
val sel_defs = get_defs defs_thy sel_specs;
val update_defs = get_defs defs_thy update_specs;
val make_defs = get_defs defs_thy make_specs;
(* 3rd stage: thms_thy *)
val parent_simps = flat (map #simps parents);
val prove = prove_simp (Theory.sign_of defs_thy) HOL_basic_ss [];
val sel_convs = map (prove (parent_simps @ sel_defs @ field_simps)) sel_props;
val update_convs = map (prove (parent_simps @ update_defs @ sel_convs)) update_props;
val simps = field_simps @ sel_convs @ update_convs @ make_defs;
val iffs = field_injects;
val thms_thy =
defs_thy
|> (PureThy.add_thmss o map Thm.no_attributes)
[("select_defs", sel_defs),
("update_defs", update_defs),
("make_defs", make_defs),
("select_convs", sel_convs),
("update_convs", update_convs)]
|> PureThy.add_thmss
[(("simps", simps), [Simplifier.simp_add_global]),
(("iffs", iffs), [iff_add_global])];
(* 4th stage: final_thy *)
val final_thy =
thms_thy
|> put_record name {args = args, parent = parent, fields = fields, simps = simps}
|> put_sel_upd names (field_simps @ sel_defs @ update_defs)
|> add_record_splits named_splits
|> Theory.parent_path;
in (final_thy, {simps = simps, iffs = iffs}) end;
(** theory extender interface **)
(* prepare arguments *)
(*note: read_raw_typ avoids expanding type abbreviations*)
fun read_raw_parent sign s =
(case Sign.read_raw_typ (sign, K None) s handle TYPE (msg, _, _) => error msg of
Type (name, Ts) => (Ts, name)
| _ => error ("Bad parent record specification: " ^ quote s));
fun read_typ sign (env, s) =
let
fun def_sort (x, ~1) = assoc (env, x)
| def_sort _ = None;
val T = Type.no_tvars (Sign.read_typ (sign, def_sort) s) handle TYPE (msg, _, _) => error msg;
in (Term.add_typ_tfrees (T, env), T) end;
fun cert_typ sign (env, raw_T) =
let val T = Type.no_tvars (Sign.certify_typ sign raw_T) handle TYPE (msg, _, _) => error msg
in (Term.add_typ_tfrees (T, env), T) end;
(* add_record *)
(*we do all preparations and error checks here, deferring the real
work to record_definition*)
fun gen_add_record prep_typ prep_raw_parent (params, bname) raw_parent raw_fields thy =
let
val _ = Theory.requires thy "Record" "record definitions";
val sign = Theory.sign_of thy;
val _ = message ("Defining record " ^ quote bname ^ " ...");
(* parents *)
fun prep_inst T = snd (cert_typ sign ([], T));
val parent = apsome (apfst (map prep_inst) o prep_raw_parent sign) raw_parent
handle ERROR => error ("The error(s) above in parent record specification");
val parents = add_parents thy (parent, []);
val init_env =
(case parent of
None => []
| Some (types, _) => foldr Term.add_typ_tfrees (types, []));
(* fields *)
fun prep_field (env, (c, raw_T)) =
let val (env', T) = prep_typ sign (env, raw_T) handle ERROR =>
error ("The error(s) above occured in field " ^ quote c)
in (env', (c, T)) end;
val (envir, bfields) = foldl_map prep_field (init_env, raw_fields);
val envir_names = map fst envir;
(* args *)
val defaultS = Sign.defaultS sign;
val args = map (fn x => (x, if_none (assoc (envir, x)) defaultS)) params;
(* errors *)
val name = Sign.full_name sign bname;
val err_dup_record =
if is_none (get_record thy name) then []
else ["Duplicate definition of record " ^ quote name];
val err_dup_parms =
(case duplicates params of
[] => []
| dups => ["Duplicate parameter(s) " ^ commas dups]);
val err_extra_frees =
(case gen_rems (op =) (envir_names, params) of
[] => []
| extras => ["Extra free type variable(s) " ^ commas extras]);
val err_no_fields = if null bfields then ["No fields present"] else [];
val err_dup_fields =
(case duplicates (map fst bfields) of
[] => []
| dups => ["Duplicate field(s) " ^ commas_quote dups]);
val err_bad_fields =
if forall (not_equal moreN o fst) bfields then []
else ["Illegal field name " ^ quote moreN];
val err_dup_sorts =
(case duplicates envir_names of
[] => []
| dups => ["Inconsistent sort constraints for " ^ commas dups]);
val errs =
err_dup_record @ err_dup_parms @ err_extra_frees @ err_no_fields @
err_dup_fields @ err_bad_fields @ err_dup_sorts;
in
if null errs then () else error (cat_lines errs);
thy |> record_definition (args, bname) parent parents bfields
end
handle ERROR => error ("Failed to define record " ^ quote bname);
val add_record = gen_add_record read_typ read_raw_parent;
val add_record_i = gen_add_record cert_typ (K I);
(** package setup **)
(* setup theory *)
val setup =
[RecordsData.init,
Theory.add_trfuns ([], parse_translation, [], []),
Method.add_methods [record_split_method],
Simplifier.change_simpset_of Simplifier.addsimprocs [record_simproc]];
(* outer syntax *)
local structure P = OuterParse and K = OuterSyntax.Keyword in
val record_decl =
P.type_args -- P.name -- (P.$$$ "=" |-- Scan.option (P.typ --| P.$$$ "+")
-- Scan.repeat1 (P.name -- (P.$$$ "::" |-- P.typ) --| P.marg_comment));
val recordP =
OuterSyntax.command "record" "define extensible record" K.thy_decl
(record_decl >> (fn (x, (y, z)) => Toplevel.theory (#1 o add_record x y z)));
val _ = OuterSyntax.add_parsers [recordP];
end;
end;
structure BasicRecordPackage: BASIC_RECORD_PACKAGE = RecordPackage;
open BasicRecordPackage;