(* Title: HOLCF/Tools/domain/domain_extender.ML
ID: $Id$
Author: David von Oheimb
Theory extender for domain command, including theory syntax.
###TODO:
this definition
domain empty = silly empty
yields
Exception-
TERM
("typ_of_term: bad encoding of type",
[Abs ("uu", "_", Const ("NONE", "_"))]) raised
but this works fine:
domain Empty = silly Empty
strange syntax errors are produced for:
domain xx = xx ("x yy")
domain 'a foo = foo (sel::"'a")
and bar = bar ("'a dummy")
*)
signature DOMAIN_EXTENDER =
sig
val add_domain: string * ((bstring * string list) *
(string * mixfix * (bool * string option * string) list) list) list
-> theory -> theory
val add_domain_i: string * ((bstring * string list) *
(string * mixfix * (bool * string option * typ) list) list) list
-> theory -> theory
end;
structure Domain_Extender: DOMAIN_EXTENDER =
struct
open Domain_Library;
(* ----- general testing and preprocessing of constructor list -------------- *)
fun check_and_sort_domain (dtnvs: (string * typ list) list,
cons'' : ((string * mixfix * (bool * string option * typ) list) list) list) sg =
let
val defaultS = Sign.defaultS sg;
val test_dupl_typs = (case duplicates (op =) (map fst dtnvs) of
[] => false | dups => error ("Duplicate types: " ^ commas_quote dups));
val test_dupl_cons = (case duplicates (op =) (map first (List.concat cons'')) of
[] => false | dups => error ("Duplicate constructors: "
^ commas_quote dups));
val test_dupl_sels = (case duplicates (op =) (List.mapPartial second
(List.concat (map third (List.concat cons'')))) of
[] => false | dups => error("Duplicate selectors: "^commas_quote dups));
val test_dupl_tvars = exists(fn s=>case duplicates (op =) (map(fst o dest_TFree)s)of
[] => false | dups => error("Duplicate type arguments: "
^commas_quote dups)) (map snd dtnvs);
(* test for free type variables, illegal sort constraints on rhs,
non-pcpo-types and invalid use of recursive type;
replace sorts in type variables on rhs *)
fun analyse_equation ((dname,typevars),cons') =
let
val tvars = map dest_TFree typevars;
val distinct_typevars = map TFree tvars;
fun rm_sorts (TFree(s,_)) = TFree(s,[])
| rm_sorts (Type(s,ts)) = Type(s,remove_sorts ts)
| rm_sorts (TVar(s,_)) = TVar(s,[])
and remove_sorts l = map rm_sorts l;
val indirect_ok = ["*","Cfun.->","Ssum.++","Sprod.**","Up.u"]
fun analyse indirect (TFree(v,s)) = (case AList.lookup (op =) tvars v of
NONE => error ("Free type variable " ^ quote v ^ " on rhs.")
| SOME sort => if eq_set_string (s,defaultS) orelse
eq_set_string (s,sort )
then TFree(v,sort)
else error ("Inconsistent sort constraint" ^
" for type variable " ^ quote v))
| analyse indirect (t as Type(s,typl)) = (case AList.lookup (op =) dtnvs s of
NONE => if s mem indirect_ok
then Type(s,map (analyse false) typl)
else Type(s,map (analyse true) typl)
| SOME typevars => if indirect
then error ("Indirect recursion of type " ^
quote (string_of_typ sg t))
else if dname <> s orelse (** BUG OR FEATURE?:
mutual recursion may use different arguments **)
remove_sorts typevars = remove_sorts typl
then Type(s,map (analyse true) typl)
else error ("Direct recursion of type " ^
quote (string_of_typ sg t) ^
" with different arguments"))
| analyse indirect (TVar _) = Imposs "extender:analyse";
fun check_pcpo T = if pcpo_type sg T then T
else error("Constructor argument type is not of sort pcpo: "^string_of_typ sg T);
val analyse_con = upd_third (map (upd_third (check_pcpo o analyse false)));
in ((dname,distinct_typevars), map analyse_con cons') end;
in ListPair.map analyse_equation (dtnvs,cons'')
end; (* let *)
(* ----- calls for building new thy and thms -------------------------------- *)
fun gen_add_domain prep_typ (comp_dnam, eqs''') thy''' =
let
val dtnvs = map ((fn (dname,vs) =>
(Sign.full_name thy''' dname, map (Syntax.read_typ_global thy''') vs))
o fst) eqs''';
val cons''' = map snd eqs''';
fun thy_type (dname,tvars) = (Sign.base_name dname, length tvars, NoSyn);
fun thy_arity (dname,tvars) = (dname, map (snd o dest_TFree) tvars, pcpoS);
val thy'' = thy''' |> Theory.add_types (map thy_type dtnvs)
|> fold (AxClass.axiomatize_arity_i o thy_arity) dtnvs;
val cons'' = map (map (upd_third (map (upd_third (prep_typ thy''))))) cons''';
val eqs' = check_and_sort_domain (dtnvs,cons'') thy'';
val thy' = thy'' |> Domain_Syntax.add_syntax (comp_dnam,eqs');
val dts = map (Type o fst) eqs';
val new_dts = map (fn ((s,Ts),_) => (s, map (fst o dest_TFree) Ts)) eqs';
fun strip ss = Library.drop (find_index_eq "'" ss +1, ss);
fun typid (Type (id,_)) =
let val c = hd (Symbol.explode (Sign.base_name id))
in if Symbol.is_letter c then c else "t" end
| typid (TFree (id,_) ) = hd (strip (tl (Symbol.explode id)))
| typid (TVar ((id,_),_)) = hd (tl (Symbol.explode id));
fun one_con (con,mx,args) =
((Syntax.const_name con mx),
ListPair.map (fn ((lazy,sel,tp),vn) => ((lazy,
find_index_eq tp dts,
DatatypeAux.dtyp_of_typ new_dts tp),
sel,vn))
(args,(mk_var_names(map (typid o third) args)))
) : cons;
val eqs = map (fn (dtnvs,cons') => (dtnvs, map one_con cons')) eqs' : eq list;
val thy = thy' |> Domain_Axioms.add_axioms (comp_dnam,eqs);
val (theorems_thy, (rewss, take_rews)) = (foldl_map (fn (thy0,eq) =>
Domain_Theorems.theorems (eq,eqs) thy0) (thy,eqs))
|>>> Domain_Theorems.comp_theorems (comp_dnam, eqs);
in
theorems_thy
|> Theory.add_path (Sign.base_name comp_dnam)
|> (snd o (PureThy.add_thmss [(("rews", List.concat rewss @ take_rews), [])]))
|> Theory.parent_path
end;
val add_domain_i = gen_add_domain Sign.certify_typ;
val add_domain = gen_add_domain Syntax.read_typ_global;
(** outer syntax **)
local structure P = OuterParse and K = OuterKeyword in
val dest_decl =
P.$$$ "(" |-- Scan.optional (P.$$$ "lazy" >> K true) false --
(P.name >> SOME) -- (P.$$$ "::" |-- P.typ) --| P.$$$ ")" >> P.triple1
|| P.$$$ "(" |-- P.$$$ "lazy" |-- P.typ --| P.$$$ ")"
>> (fn t => (true,NONE,t))
|| P.typ >> (fn t => (false,NONE,t));
val cons_decl =
P.name -- Scan.repeat dest_decl -- P.opt_mixfix
>> (fn ((c, ds), mx) => (c, mx, ds));
val type_var' = (P.type_ident ^^
Scan.optional (P.$$$ "::" ^^ P.!!! P.sort) "");
val type_args' = type_var' >> single ||
P.$$$ "(" |-- P.!!! (P.list1 type_var' --| P.$$$ ")") ||
Scan.succeed [];
val domain_decl = (type_args' -- P.name >> Library.swap) --
(P.$$$ "=" |-- P.enum1 "|" cons_decl);
val domains_decl =
Scan.option (P.$$$ "(" |-- P.name --| P.$$$ ")") -- P.and_list1 domain_decl
>> (fn (opt_name, doms) =>
(case opt_name of NONE => space_implode "_" (map (#1 o #1) doms) | SOME s => s, doms));
val domainP =
OuterSyntax.command "domain" "define recursive domains (HOLCF)" K.thy_decl
(domains_decl >> (Toplevel.theory o add_domain));
val _ = OuterSyntax.add_keywords ["lazy"];
val _ = OuterSyntax.add_parsers [domainP];
end; (* local structure *)
end;