(* Title: Pure/Isar/attrib.ML
ID: $Id$
Author: Markus Wenzel, TU Muenchen
Symbolic theorem attributes.
*)
signature BASIC_ATTRIB =
sig
val print_attributes: theory -> unit
val Attribute: bstring -> (Args.src -> theory attribute) * (Args.src -> ProofContext.context attribute)
-> string -> unit
end;
signature ATTRIB =
sig
include BASIC_ATTRIB
type src
exception ATTRIB_FAIL of (string * Position.T) * exn
val intern: Sign.sg -> xstring -> string
val intern_src: Sign.sg -> src -> src
val global_attribute_i: theory -> src -> theory attribute
val global_attribute: theory -> src -> theory attribute
val local_attribute_i: theory -> src -> ProofContext.context attribute
val local_attribute: theory -> src -> ProofContext.context attribute
val context_attribute_i: ProofContext.context -> Args.src -> ProofContext.context attribute
val context_attribute: ProofContext.context -> Args.src -> ProofContext.context attribute
val undef_global_attribute: theory attribute
val undef_local_attribute: ProofContext.context attribute
val crude_closure: ProofContext.context -> src -> src
val add_attributes: (bstring * ((src -> theory attribute) *
(src -> ProofContext.context attribute)) * string) list -> theory -> theory
val global_thm: theory * Args.T list -> thm * (theory * Args.T list)
val global_thms: theory * Args.T list -> thm list * (theory * Args.T list)
val global_thmss: theory * Args.T list -> thm list * (theory * Args.T list)
val local_thm: ProofContext.context * Args.T list -> thm * (ProofContext.context * Args.T list)
val local_thms: ProofContext.context * Args.T list -> thm list * (ProofContext.context * Args.T list)
val local_thmss: ProofContext.context * Args.T list -> thm list * (ProofContext.context * Args.T list)
val syntax: ('a * Args.T list -> 'a attribute * ('a * Args.T list)) -> src -> 'a attribute
val no_args: 'a attribute -> src -> 'a attribute
val add_del_args: 'a attribute -> 'a attribute -> src -> 'a attribute
val attribute: (theory attribute * ProofContext.context attribute) -> src
end;
structure Attrib: ATTRIB =
struct
type src = Args.src;
(** attributes theory data **)
(* data kind 'Isar/attributes' *)
structure AttributesDataArgs =
struct
val name = "Isar/attributes";
type T =
{space: NameSpace.T,
attrs:
((((src -> theory attribute) * (src -> ProofContext.context attribute))
* string) * stamp) Symtab.table};
val empty = {space = NameSpace.empty, attrs = Symtab.empty};
val copy = I;
val prep_ext = I;
fun merge ({space = space1, attrs = attrs1}, {space = space2, attrs = attrs2}) =
{space = NameSpace.merge (space1, space2),
attrs = Symtab.merge eq_snd (attrs1, attrs2) handle Symtab.DUPS dups =>
error ("Attempt to merge different versions of attributes " ^ commas_quote dups)};
fun print _ {space, attrs} =
let
fun prt_attr (name, ((_, comment), _)) = Pretty.block
[Pretty.str (name ^ ":"), Pretty.brk 2, Pretty.str comment];
in
[Pretty.big_list "attributes:" (map prt_attr (NameSpace.extern_table space attrs))]
|> Pretty.chunks |> Pretty.writeln
end;
end;
structure AttributesData = TheoryDataFun(AttributesDataArgs);
val _ = Context.add_setup [AttributesData.init];
val print_attributes = AttributesData.print;
(* interning *)
val intern = NameSpace.intern o #space o AttributesData.get_sg;
val intern_src = Args.map_name o intern;
(* get global / local attributes *)
exception ATTRIB_FAIL of (string * Position.T) * exn;
fun gen_attribute which thy =
let
val {attrs, ...} = AttributesData.get thy;
fun attr src =
let
val ((name, _), pos) = Args.dest_src src;
in
(case Symtab.lookup (attrs, name) of
NONE => error ("Unknown attribute: " ^ quote name ^ Position.str_of pos)
| SOME ((p, _), _) => transform_failure (curry ATTRIB_FAIL (name, pos)) (which p src))
end;
in attr end;
val global_attribute_i = gen_attribute fst;
fun global_attribute thy = global_attribute_i thy o intern_src (Theory.sign_of thy);
val local_attribute_i = gen_attribute snd;
fun local_attribute thy = local_attribute_i thy o intern_src (Theory.sign_of thy);
val context_attribute_i = local_attribute_i o ProofContext.theory_of;
val context_attribute = local_attribute o ProofContext.theory_of;
val undef_global_attribute: theory attribute =
fn _ => error "attribute undefined in theory context";
val undef_local_attribute: ProofContext.context attribute =
fn _ => error "attribute undefined in proof context";
(* crude_closure *)
(*Produce closure without knowing facts in advance! The following
should work reasonably well for attribute parsers that do not peek
at the thm structure.*)
fun crude_closure ctxt src =
(try (transform_error (fn () => context_attribute_i ctxt src (ctxt, Drule.asm_rl))) ();
Args.closure src);
(* add_attributes *)
fun add_attributes raw_attrs thy =
let
val sg = Theory.sign_of thy;
val new_attrs = raw_attrs |> map (fn (name, (f, g), comment) =>
(Sign.full_name sg name, (((f, g), comment), stamp ())));
val {space, attrs} = AttributesData.get thy;
val space' = fold (Sign.declare_name sg) (map fst new_attrs) space;
val attrs' = Symtab.extend (attrs, new_attrs) handle Symtab.DUPS dups =>
error ("Duplicate declaration of attributes(s) " ^ commas_quote dups);
in thy |> AttributesData.put {space = space', attrs = attrs'} end;
(*implicit version*)
fun Attribute name att cmt = Context.>> (add_attributes [(name, att, cmt)]);
(** attribute parsers **)
(* tags *)
fun tag x = Scan.lift (Args.name -- Scan.repeat Args.name) x;
(* theorems *)
fun gen_thm theory_of attrib get pick = Scan.depend (fn st =>
Scan.ahead Args.name -- Args.named_fact (fn name => get st (name, NONE)) --
Scan.option Args.thm_sel -- Args.opt_attribs (intern (Theory.sign_of (theory_of st)))
>> (fn (((name, fact), sel), srcs) =>
let
val ths = PureThy.select_thm (name, sel) fact;
val atts = map (attrib (theory_of st)) srcs;
val (st', ths') = Thm.applys_attributes ((st, ths), atts);
in (st', pick name ths') end));
val global_thm = gen_thm I global_attribute_i PureThy.get_thms PureThy.single_thm;
val global_thms = gen_thm I global_attribute_i PureThy.get_thms (K I);
val global_thmss = Scan.repeat global_thms >> List.concat;
val local_thm =
gen_thm ProofContext.theory_of local_attribute_i ProofContext.get_thms PureThy.single_thm;
val local_thms =
gen_thm ProofContext.theory_of local_attribute_i ProofContext.get_thms (K I);
val local_thmss = Scan.repeat local_thms >> List.concat;
(** attribute syntax **)
fun syntax scan src (st, th) =
let val (st', f) = Args.syntax "attribute" scan src st
in f (st', th) end;
fun no_args x = syntax (Scan.succeed x);
fun add_del_args add del x = syntax
(Scan.lift (Args.add >> K add || Args.del >> K del || Scan.succeed add)) x;
(** Pure attributes **)
(* tags *)
fun gen_tagged x = syntax (tag >> Drule.tag) x;
fun gen_untagged x = syntax (Scan.lift Args.name >> Drule.untag) x;
(* COMP *)
fun comp (i, B) (x, A) = (x, Drule.compose_single (A, i, B));
fun gen_COMP thm = syntax (Scan.lift (Scan.optional (Args.bracks Args.nat) 1) -- thm >> comp);
val COMP_global = gen_COMP global_thm;
val COMP_local = gen_COMP local_thm;
(* THEN, which corresponds to RS *)
fun resolve (i, B) (x, A) = (x, A RSN (i, B));
fun gen_THEN thm = syntax (Scan.lift (Scan.optional (Args.bracks Args.nat) 1) -- thm >> resolve);
val THEN_global = gen_THEN global_thm;
val THEN_local = gen_THEN local_thm;
(* OF *)
fun apply Bs (x, A) = (x, Bs MRS A);
val OF_global = syntax (global_thmss >> apply);
val OF_local = syntax (local_thmss >> apply);
(* read_instantiate: named instantiation of type and term variables *)
local
fun is_tvar (x, _) = (case Symbol.explode x of "'" :: _ => true | _ => false);
fun error_var msg xi = error (msg ^ Syntax.string_of_vname xi);
fun the_sort sorts xi = the (sorts xi)
handle Option.Option => error_var "No such type variable in theorem: " xi;
fun the_type types xi = the (types xi)
handle Option.Option => error_var "No such variable in theorem: " xi;
fun unify_types sign types ((unifier, maxidx), (xi, u)) =
let
val T = the_type types xi;
val U = Term.fastype_of u;
val maxidx' = Int.max (maxidx, Int.max (#2 xi, Term.maxidx_of_term u));
in
Type.unify (Sign.tsig_of sign) (unifier, maxidx') (T, U)
handle Type.TUNIFY => error_var "Incompatible type for instantiation of " xi
end;
fun typ_subst env = apsnd (Term.typ_subst_TVars env);
fun subst env = apsnd (Term.subst_TVars env);
fun instantiate sign envT env thm =
let
val (_, sorts) = Drule.types_sorts thm;
fun prepT (a, T) = (Thm.ctyp_of sign (TVar (a, the_sort sorts a)), Thm.ctyp_of sign T);
fun prep (xi, t) = pairself (Thm.cterm_of sign) (Var (xi, Term.fastype_of t), t);
in
Drule.instantiate (map prepT (distinct envT),
map prep (gen_distinct (fn ((xi, t), (yj, u)) => xi = yj andalso t aconv u) env)) thm
end;
in
fun read_instantiate init mixed_insts (context, thm) =
let
val ctxt = init context;
val sign = ProofContext.sign_of ctxt;
val (type_insts, term_insts) = List.partition (is_tvar o #1) (map #2 mixed_insts);
val internal_insts = term_insts |> List.mapPartial
(fn (xi, Args.Term t) => SOME (xi, t)
| (_, Args.Name _) => NONE
| (xi, _) => error_var "Term argument expected for " xi);
val external_insts = term_insts |> List.mapPartial
(fn (xi, Args.Name s) => SOME (xi, s) | _ => NONE);
(* type instantiations *)
val sorts = #2 (Drule.types_sorts thm);
fun readT (xi, arg) =
let
val S = the_sort sorts xi;
val T =
(case arg of
Args.Name s => ProofContext.read_typ ctxt s
| Args.Typ T => T
| _ => error_var "Type argument expected for " xi);
in
if Sign.of_sort sign (T, S) then (xi, T)
else error_var "Incompatible sort for typ instantiation of " xi
end;
val type_insts' = map readT type_insts;
val thm' = instantiate sign type_insts' [] thm;
(* internal term instantiations *)
val types' = #1 (Drule.types_sorts thm');
val unifier = map (apsnd snd) (Vartab.dest (#1
(Library.foldl (unify_types sign types') ((Vartab.empty, 0), internal_insts))));
val type_insts'' = map (typ_subst unifier) type_insts';
val internal_insts'' = map (subst unifier) internal_insts;
val thm'' = instantiate sign unifier internal_insts'' thm';
(* external term instantiations *)
val types'' = #1 (Drule.types_sorts thm'');
val (xs, ss) = split_list external_insts;
val Ts = map (the_type types'') xs;
val (ts, inferred) = ProofContext.read_termTs ctxt (K false)
(K NONE) (K NONE) (Drule.add_used thm'' []) (ss ~~ Ts);
val type_insts''' = map (typ_subst inferred) type_insts'';
val internal_insts''' = map (subst inferred) internal_insts'';
val external_insts''' = xs ~~ ts;
val term_insts''' = internal_insts''' @ external_insts''';
val thm''' = instantiate sign inferred external_insts''' thm'';
in
(* assign internalized values *)
mixed_insts |> List.app (fn (arg, (xi, _)) =>
if is_tvar xi then
Args.assign (SOME (Args.Typ (the (assoc (type_insts''', xi))))) arg
else
Args.assign (SOME (Args.Term (the (assoc (term_insts''', xi))))) arg);
(context, thm''' |> RuleCases.save thm)
end;
end;
(* where: named instantiation *)
local
val value =
Args.internal_typ >> Args.Typ ||
Args.internal_term >> Args.Term ||
Args.name >> Args.Name;
val inst = Args.var -- (Args.$$$ "=" |-- Args.ahead -- value)
>> (fn (xi, (a, v)) => (a, (xi, v)));
fun gen_where init =
syntax (Args.and_list (Scan.lift inst) >> read_instantiate init);
in
val where_global = gen_where ProofContext.init;
val where_local = gen_where I;
end;
(* of: positional instantiation (term arguments only) *)
local
fun read_instantiate' init (args, concl_args) (context, thm) =
let
fun zip_vars _ [] = []
| zip_vars (_ :: xs) ((_, NONE) :: rest) = zip_vars xs rest
| zip_vars ((x, _) :: xs) ((a, SOME t) :: rest) = (a, (x, t)) :: zip_vars xs rest
| zip_vars [] _ = error "More instantiations than variables in theorem";
val insts =
zip_vars (Drule.vars_of_terms [Thm.prop_of thm]) args @
zip_vars (Drule.vars_of_terms [Thm.concl_of thm]) concl_args;
in
read_instantiate init insts (context, thm)
end;
val value =
Args.internal_term >> Args.Term ||
Args.name >> Args.Name;
val inst = Args.ahead -- Args.maybe value;
val concl = Args.$$$ "concl" -- Args.colon;
val insts =
Scan.repeat (Scan.unless concl inst) --
Scan.optional (concl |-- Scan.repeat inst) [];
fun gen_of init = syntax (Scan.lift insts >> read_instantiate' init);
in
val of_global = gen_of ProofContext.init;
val of_local = gen_of I;
end;
(* rename_abs *)
fun rename_abs src = syntax
(Scan.lift (Scan.repeat (Args.maybe Args.name) >> (apsnd o Drule.rename_bvars'))) src;
(* unfold / fold definitions *)
fun gen_rewrite rew defs (x, thm) = (x, rew defs thm);
val unfolded_global = syntax (global_thmss >> gen_rewrite Tactic.rewrite_rule);
val unfolded_local = syntax (local_thmss >> gen_rewrite Tactic.rewrite_rule);
val folded_global = syntax (global_thmss >> gen_rewrite Tactic.fold_rule);
val folded_local = syntax (local_thmss >> gen_rewrite Tactic.fold_rule);
(* rule cases *)
fun consumes x = syntax (Scan.lift (Scan.optional Args.nat 1) >> RuleCases.consumes) x;
fun case_names x = syntax (Scan.lift (Scan.repeat1 Args.name) >> RuleCases.case_names) x;
fun params x = syntax (Args.and_list1 (Scan.lift (Scan.repeat Args.name)) >> RuleCases.params) x;
(* rule_format *)
fun rule_format_att x = syntax (Args.mode "no_asm"
>> (fn true => ObjectLogic.rule_format_no_asm | false => ObjectLogic.rule_format)) x;
(* misc rules *)
fun standard x = no_args (Drule.rule_attribute (K Drule.standard)) x;
fun elim_format x = no_args (Drule.rule_attribute (K Tactic.make_elim)) x;
fun no_vars x = no_args (Drule.rule_attribute (K (#1 o Drule.freeze_thaw))) x;
fun eta_long x = no_args (Drule.rule_attribute (K (Drule.fconv_rule Drule.eta_long_conversion))) x;
(* rule declarations *)
local
fun add_args a b c x = syntax
(Scan.lift ((Args.bang >> K a || Args.query >> K c || Scan.succeed b) -- (Scan.option Args.nat))
>> (fn (f, n) => f n)) x;
fun del_args att = syntax (Scan.lift Args.del >> K att);
open ContextRules;
in
val rule_atts =
[("intro",
(add_args intro_bang_global intro_global intro_query_global,
add_args intro_bang_local intro_local intro_query_local),
"declaration of introduction rule"),
("elim",
(add_args elim_bang_global elim_global elim_query_global,
add_args elim_bang_local elim_local elim_query_local),
"declaration of elimination rule"),
("dest",
(add_args dest_bang_global dest_global dest_query_global,
add_args dest_bang_local dest_local dest_query_local),
"declaration of destruction rule"),
("rule", (del_args rule_del_global, del_args rule_del_local),
"remove declaration of intro/elim/dest rule")];
end;
(* internal attribute *)
fun attribute att = Args.src (("Pure.attribute", [Args.mk_attribute att]), Position.none);
fun attribute_global x = (syntax (Scan.lift Args.internal_attribute >> #1)) x;
fun attribute_local x = (syntax (Scan.lift Args.internal_attribute >> #2)) x;
val _ = Context.add_setup
[add_attributes [("attribute", (attribute_global, attribute_local), "internal attribute")]];
(* pure_attributes *)
val pure_attributes =
[("tagged", (gen_tagged, gen_tagged), "tagged theorem"),
("untagged", (gen_untagged, gen_untagged), "untagged theorem"),
("COMP", (COMP_global, COMP_local), "direct composition with rules (no lifting)"),
("THEN", (THEN_global, THEN_local), "resolution with rule"),
("OF", (OF_global, OF_local), "rule applied to facts"),
("where", (where_global, where_local), "named instantiation of theorem"),
("of", (of_global, of_local), "rule applied to terms"),
("rename_abs", (rename_abs, rename_abs), "rename bound variables in abstractions"),
("unfolded", (unfolded_global, unfolded_local), "unfolded definitions"),
("folded", (folded_global, folded_local), "folded definitions"),
("standard", (standard, standard), "result put into standard form"),
("elim_format", (elim_format, elim_format), "destruct rule turned into elimination rule format"),
("no_vars", (no_vars, no_vars), "frozen schematic vars"),
("eta_long", (eta_long, eta_long), "put theorem into eta long beta normal form"),
("consumes", (consumes, consumes), "number of consumed facts"),
("case_names", (case_names, case_names), "named rule cases"),
("params", (params, params), "named rule parameters"),
("atomize", (no_args ObjectLogic.declare_atomize, no_args undef_local_attribute),
"declaration of atomize rule"),
("rulify", (no_args ObjectLogic.declare_rulify, no_args undef_local_attribute),
"declaration of rulify rule"),
("rule_format", (rule_format_att, rule_format_att), "result put into standard rule format")] @
rule_atts;
val _ = Context.add_setup [add_attributes pure_attributes];
end;
structure BasicAttrib: BASIC_ATTRIB = Attrib;
open BasicAttrib;