src/Pure/Isar/attrib.ML
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(*  Title:      Pure/Isar/attrib.ML
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    ID:         $Id$
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    Author:     Markus Wenzel, TU Muenchen
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Symbolic representation of attributes -- with name and syntax.
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*)
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signature BASIC_ATTRIB =
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sig
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  val print_attributes: theory -> unit
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  val Attribute: bstring -> (Args.src -> attribute) -> string -> unit
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end;
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signature ATTRIB =
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sig
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  include BASIC_ATTRIB
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  type src
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  exception ATTRIB_FAIL of (string * Position.T) * exn
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  val intern: theory -> xstring -> string
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  val intern_src: theory -> src -> src
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  val attribute: theory -> src -> attribute
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  val attribute_i: theory -> src -> attribute
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  val map_specs: ('a -> 'att) ->
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    (('c * 'a list) * 'd) list -> (('c * 'att list) * 'd) list
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  val map_facts: ('a -> 'att) ->
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    (('c * 'a list) * ('d * 'a list) list) list ->
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    (('c * 'att list) * ('d * 'att list) list) list
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  val crude_closure: Context.proof -> src -> src
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  val add_attributes: (bstring * (src -> attribute) * string) list -> theory -> theory
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  val thm: Context.generic * Args.T list -> thm * (Context.generic * Args.T list)
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  val thms: Context.generic * Args.T list -> thm list * (Context.generic * Args.T list)
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  val multi_thm: Context.generic * Args.T list -> thm list * (Context.generic * Args.T list)
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  val syntax: (Context.generic * Args.T list ->
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    attribute * (Context.generic * Args.T list)) -> src -> attribute
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  val no_args: attribute -> src -> attribute
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  val add_del_args: attribute -> attribute -> src -> attribute
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  val internal: attribute -> src
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end;
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structure Attrib: ATTRIB =
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struct
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type src = Args.src;
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(** named attributes **)
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(* theory data *)
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structure AttributesData = TheoryDataFun
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(struct
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  val name = "Isar/attributes";
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  type T = (((src -> attribute) * string) * stamp) NameSpace.table;
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  val empty = NameSpace.empty_table;
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  val copy = I;
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  val extend = I;
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  fun merge _ tables = NameSpace.merge_tables (eq_snd (op =)) tables handle Symtab.DUPS dups =>
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    error ("Attempt to merge different versions of attribute(s) " ^ commas_quote dups);
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  fun print _ attribs =
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    let
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      fun prt_attr (name, ((_, comment), _)) = Pretty.block
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        [Pretty.str (name ^ ":"), Pretty.brk 2, Pretty.str comment];
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    in
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      [Pretty.big_list "attributes:" (map prt_attr (NameSpace.extern_table attribs))]
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      |> Pretty.chunks |> Pretty.writeln
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    end;
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end);
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val _ = Context.add_setup AttributesData.init;
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val print_attributes = AttributesData.print;
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(* interning *)
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val intern = NameSpace.intern o #1 o AttributesData.get;
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val intern_src = Args.map_name o intern;
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(* get attributes *)
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exception ATTRIB_FAIL of (string * Position.T) * exn;
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fun attribute_i thy =
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  let
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    val attrs = #2 (AttributesData.get thy);
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    fun attr src =
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      let val ((name, _), pos) = Args.dest_src src in
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        (case Symtab.lookup attrs name of
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          NONE => error ("Unknown attribute: " ^ quote name ^ Position.str_of pos)
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        | SOME ((att, _), _) => transform_failure (curry ATTRIB_FAIL (name, pos)) (att src))
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      end;
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  in attr end;
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fun attribute thy = attribute_i thy o intern_src thy;
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(* attributed declarations *)
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fun map_specs f = map (apfst (apsnd (map f)));
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fun map_facts f = map (apfst (apsnd (map f)) o apsnd (map (apsnd (map f))));
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(* crude_closure *)
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(*Produce closure without knowing facts in advance! The following
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  works reasonably well for attribute parsers that do not peek at the
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  thm structure.*)
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fun crude_closure ctxt src =
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 (try (fn () => attribute_i (ProofContext.theory_of ctxt) src
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    (Context.Proof ctxt, Drule.asm_rl)) ();
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  Args.closure src);
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(* add_attributes *)
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fun add_attributes raw_attrs thy =
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  let
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    val new_attrs =
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      raw_attrs |> map (fn (name, att, comment) => (name, ((att, comment), stamp ())));
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    fun add attrs = NameSpace.extend_table (Sign.naming_of thy) (attrs, new_attrs)
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      handle Symtab.DUPS dups =>
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        error ("Duplicate declaration of attributes(s) " ^ commas_quote dups);
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  in AttributesData.map add thy end;
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(*implicit version*)
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fun Attribute name att cmt = Context.>> (add_attributes [(name, att, cmt)]);
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(** attribute parsers **)
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(* tags *)
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fun tag x = Scan.lift (Args.name -- Scan.repeat Args.name) x;
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(* theorems *)
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local
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val get_thms = Context.cases PureThy.get_thms ProofContext.get_thms;
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fun gen_thm pick = Scan.depend (fn st =>
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 (Scan.ahead Args.alt_name -- Args.named_fact (get_thms st o Fact)
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    >> (fn (s, fact) => ("", Fact s, fact)) ||
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  Scan.ahead Args.name -- Args.named_fact (get_thms st o Name) -- Args.thm_sel
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    >> (fn ((name, fact), sel) => (name, NameSelection (name, sel), fact)) ||
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  Scan.ahead Args.name -- Args.named_fact (get_thms st o Name)
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    >> (fn (name, fact) => (name, Name name, fact))) --
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  Args.opt_attribs (intern (Context.theory_of st))
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  >> (fn ((name, thmref, fact), srcs) =>
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    let
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      val ths = PureThy.select_thm thmref fact;
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      val atts = map (attribute_i (Context.theory_of st)) srcs;
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      val (st', ths') = foldl_map (Library.apply atts) (st, ths);
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    in (st', pick name ths') end));
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in
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val thm = gen_thm PureThy.single_thm;
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val multi_thm = gen_thm (K I);
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val thms = Scan.repeat multi_thm >> List.concat;
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end;
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(** attribute syntax **)
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fun syntax scan src (st, th) =
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  let val (st', f) = Args.syntax "attribute" scan src st
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  in f (st', th) end;
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fun no_args x = syntax (Scan.succeed x);
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fun add_del_args add del x = syntax
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  (Scan.lift (Args.add >> K add || Args.del >> K del || Scan.succeed add)) x;
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(** basic attributes **)
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(* tags *)
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fun tagged x = syntax (tag >> PureThy.tag) x;
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fun untagged x = syntax (Scan.lift Args.name >> PureThy.untag) x;
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(* rule composition *)
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val COMP_att =
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  syntax (Scan.lift (Scan.optional (Args.bracks Args.nat) 1) -- thm
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    >> (fn (i, B) => Thm.rule_attribute (fn _ => fn A => Drule.compose_single (A, i, B))));
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val THEN_att =
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  syntax (Scan.lift (Scan.optional (Args.bracks Args.nat) 1) -- thm
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    >> (fn (i, B) => Thm.rule_attribute (fn _ => fn A => A RSN (i, B))));
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val OF_att =
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  syntax (thms >> (fn Bs => Thm.rule_attribute (fn _ => fn A => Bs MRS A)));
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(* read_instantiate: named instantiation of type and term variables *)
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local
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fun is_tvar (x, _) = (case Symbol.explode x of "'" :: _ => true | _ => false);
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fun error_var msg xi = error (msg ^ Syntax.string_of_vname xi);
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fun the_sort sorts xi = the (sorts xi)
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  handle Option.Option => error_var "No such type variable in theorem: " xi;
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fun the_type types xi = the (types xi)
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  handle Option.Option => error_var "No such variable in theorem: " xi;
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fun unify_types thy types ((unifier, maxidx), (xi, u)) =
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  let
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    val T = the_type types xi;
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    val U = Term.fastype_of u;
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    val maxidx' = Int.max (maxidx, Int.max (#2 xi, Term.maxidx_of_term u));
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  in
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    Sign.typ_unify thy (T, U) (unifier, maxidx')
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      handle Type.TUNIFY => error_var "Incompatible type for instantiation of " xi
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  end;
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fun typ_subst env = apsnd (Term.typ_subst_TVars env);
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fun subst env = apsnd (Term.subst_TVars env);
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fun instantiate thy envT env thm =
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  let
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    val (_, sorts) = Drule.types_sorts thm;
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    fun prepT (a, T) = (Thm.ctyp_of thy (TVar (a, the_sort sorts a)), Thm.ctyp_of thy T);
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    fun prep (xi, t) = pairself (Thm.cterm_of thy) (Var (xi, Term.fastype_of t), t);
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  in
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    Drule.instantiate (map prepT (gen_distinct (op =) envT),
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      map prep (gen_distinct (fn ((xi, t), (yj, u)) => xi = yj andalso t aconv u) env)) thm
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  end;
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in
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fun read_instantiate mixed_insts (generic, thm) =
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  let
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    val thy = Context.theory_of generic;
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    val ctxt = Context.proof_of generic;
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    val (type_insts, term_insts) = List.partition (is_tvar o fst) (map snd mixed_insts);
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    val internal_insts = term_insts |> List.mapPartial
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      (fn (xi, Args.Term t) => SOME (xi, t)
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      | (_, Args.Name _) => NONE
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      | (xi, _) => error_var "Term argument expected for " xi);
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    val external_insts = term_insts |> List.mapPartial
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      (fn (xi, Args.Name s) => SOME (xi, s) | _ => NONE);
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    (* type instantiations *)
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    val sorts = #2 (Drule.types_sorts thm);
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    fun readT (xi, arg) =
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      let
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        val S = the_sort sorts xi;
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        val T =
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          (case arg of
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            Args.Name s => ProofContext.read_typ ctxt s
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          | Args.Typ T => T
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          | _ => error_var "Type argument expected for " xi);
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      in
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        if Sign.of_sort thy (T, S) then (xi, T)
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        else error_var "Incompatible sort for typ instantiation of " xi
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      end;
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    val type_insts' = map readT type_insts;
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    val thm' = instantiate thy type_insts' [] thm;
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    (* internal term instantiations *)
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    val types' = #1 (Drule.types_sorts thm');
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    val unifier = map (apsnd snd) (Vartab.dest (#1
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      (Library.foldl (unify_types thy types') ((Vartab.empty, 0), internal_insts))));
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    val type_insts'' = map (typ_subst unifier) type_insts';
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    val internal_insts'' = map (subst unifier) internal_insts;
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    val thm'' = instantiate thy unifier internal_insts'' thm';
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    (* external term instantiations *)
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    val types'' = #1 (Drule.types_sorts thm'');
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    val (xs, ss) = split_list external_insts;
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    val Ts = map (the_type types'') xs;
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    val (ts, inferred) = ProofContext.read_termTs ctxt (K false)
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        (K NONE) (K NONE) (Drule.add_used thm'' []) (ss ~~ Ts);
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    val type_insts''' = map (typ_subst inferred) type_insts'';
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    val internal_insts''' = map (subst inferred) internal_insts'';
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    val external_insts''' = xs ~~ ts;
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    val term_insts''' = internal_insts''' @ external_insts''';
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    val thm''' = instantiate thy inferred external_insts''' thm'';
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    (* assign internalized values *)
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    val _ =
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      mixed_insts |> List.app (fn (arg, (xi, _)) =>
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        if is_tvar xi then
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          Args.assign (SOME (Args.Typ (the (AList.lookup (op =) type_insts''' xi)))) arg
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        else
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          Args.assign (SOME (Args.Term (the (AList.lookup (op =) term_insts''' xi)))) arg);
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  in (generic, thm''' |> RuleCases.save thm) end;
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end;
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(* where: named instantiation *)
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local
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val value =
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  Args.internal_typ >> Args.Typ ||
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  Args.internal_term >> Args.Term ||
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  Args.name >> Args.Name;
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val inst = Args.var -- (Args.$$$ "=" |-- Args.ahead -- value)
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  >> (fn (xi, (a, v)) => (a, (xi, v)));
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in
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val where_att = syntax (Args.and_list (Scan.lift inst) >> read_instantiate);
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end;
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(* of: positional instantiation (term arguments only) *)
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local
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fun read_instantiate' (args, concl_args) (generic, thm) =
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  let
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    fun zip_vars _ [] = []
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      | zip_vars (_ :: xs) ((_, NONE) :: rest) = zip_vars xs rest
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      | zip_vars ((x, _) :: xs) ((a, SOME t) :: rest) = (a, (x, t)) :: zip_vars xs rest
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      | zip_vars [] _ = error "More instantiations than variables in theorem";
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    val insts =
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      zip_vars (Drule.vars_of_terms [Thm.prop_of thm]) args @
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      zip_vars (Drule.vars_of_terms [Thm.concl_of thm]) concl_args;
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  in read_instantiate insts (generic, thm) end;
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val value =
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  Args.internal_term >> Args.Term ||
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  Args.name >> Args.Name;
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val inst = Args.ahead -- Args.maybe value;
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ae001d5119fc export read_inst', inst';
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val concl = Args.$$$ "concl" -- Args.colon;
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val insts =
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  Scan.repeat (Scan.unless concl inst) --
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  Scan.optional (concl |-- Scan.repeat inst) [];
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in
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val of_att = syntax (Scan.lift insts >> read_instantiate');
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end;
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(* rename_abs *)
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fun rename_abs src = syntax
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  (Scan.lift (Scan.repeat (Args.maybe Args.name) >> (apsnd o Drule.rename_bvars'))) src;
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(* unfold / fold definitions *)
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fun unfolded_syntax rule =
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  syntax (thms >>
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    (fn ths => Thm.rule_attribute (fn context => rule (Context.proof_of context) ths)));
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val unfolded = unfolded_syntax LocalDefs.unfold;
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val folded = unfolded_syntax LocalDefs.fold;
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af320257c902 unfold / fold defs;
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(* rule cases *)
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fun consumes x = syntax (Scan.lift (Scan.optional Args.nat 1) >> RuleCases.consumes) x;
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fun case_names x = syntax (Scan.lift (Scan.repeat1 Args.name) >> RuleCases.case_names) x;
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fun case_conclusion x =
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  syntax (Scan.lift (Args.name -- Scan.repeat Args.name) >> RuleCases.case_conclusion) x;
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fun params x = syntax (Args.and_list1 (Scan.lift (Scan.repeat Args.name)) >> RuleCases.params) x;
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(* rule_format *)
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fun rule_format_att x = syntax (Args.mode "no_asm"
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  >> (fn true => ObjectLogic.rule_format_no_asm | false => ObjectLogic.rule_format)) x;
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(* misc rules *)
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fun standard x = no_args (Thm.rule_attribute (K Drule.standard)) x;
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fun elim_format x = no_args (Thm.rule_attribute (K Tactic.make_elim)) x;
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fun no_vars x = no_args (Thm.rule_attribute (K (#1 o Drule.freeze_thaw))) x;
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fun eta_long x = no_args (Thm.rule_attribute (K (Drule.fconv_rule Drule.eta_long_conversion))) x;
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18b8f048d93a several args parsers;
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(* internal attribute *)
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fun internal att = Args.src (("Pure.attribute", [Args.mk_attribute att]), Position.none);
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fun internal_att x = syntax (Scan.lift Args.internal_attribute) x;
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(* theory setup *)
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val _ = Context.add_setup
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 (add_attributes
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   [("tagged", tagged, "tagged theorem"),
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    ("untagged", untagged, "untagged theorem"),
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    ("COMP", COMP_att, "direct composition with rules (no lifting)"),
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    ("THEN", THEN_att, "resolution with rule"),
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    ("OF", OF_att, "rule applied to facts"),
f5ea6b0d3501 simplified type attribute;
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   431
    ("where", where_att, "named instantiation of theorem"),
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    ("of", of_att, "rule applied to terms"),
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   433
    ("rename_abs", rename_abs, "rename bound variables in abstractions"),
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    ("unfolded", unfolded, "unfolded definitions"),
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   435
    ("folded", folded, "folded definitions"),
f5ea6b0d3501 simplified type attribute;
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   436
    ("standard", standard, "result put into standard form"),
f5ea6b0d3501 simplified type attribute;
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   437
    ("elim_format", elim_format, "destruct rule turned into elimination rule format"),
f5ea6b0d3501 simplified type attribute;
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   438
    ("no_vars", no_vars, "frozen schematic vars"),
f5ea6b0d3501 simplified type attribute;
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   439
    ("eta_long", eta_long, "put theorem into eta long beta normal form"),
f5ea6b0d3501 simplified type attribute;
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   440
    ("consumes", consumes, "number of consumed facts"),
f5ea6b0d3501 simplified type attribute;
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   441
    ("case_names", case_names, "named rule cases"),
f5ea6b0d3501 simplified type attribute;
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   442
    ("case_conclusion", case_conclusion, "named conclusion of rule cases"),
f5ea6b0d3501 simplified type attribute;
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    ("params", params, "named rule parameters"),
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   444
    ("atomize", no_args ObjectLogic.declare_atomize, "declaration of atomize rule"),
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   445
    ("rulify", no_args ObjectLogic.declare_rulify, "declaration of rulify rule"),
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diff changeset
   446
    ("rule_format", rule_format_att, "result put into standard rule format"),
18839
86a59812b03b added 'defn' attribute;
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diff changeset
   447
    ("defn", add_del_args LocalDefs.defn_add LocalDefs.defn_del,
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   448
      "declaration of definitional transformations"),
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f5ea6b0d3501 simplified type attribute;
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   449
    ("attribute", internal_att, "internal attribute")]);
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ee7c198a2154 Symbolic theorem attributes.
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end;
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ee7c198a2154 Symbolic theorem attributes.
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parents:
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   453
structure BasicAttrib: BASIC_ATTRIB = Attrib;
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parents:
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open BasicAttrib;