src/Pure/Isar/attrib.ML
author wenzelm
Wed Aug 06 00:10:22 2008 +0200 (2008-08-06)
changeset 27751 22c32eb18c23
parent 27729 aaf08262b177
child 27812 af8edf3ab68c
permissions -rw-r--r--
report markup;
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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 ATTRIB =
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sig
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  type src = Args.src
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  val print_attributes: theory -> unit
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  val intern: theory -> xstring -> string
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  val intern_src: theory -> src -> src
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  val pretty_attribs: Proof.context -> src list -> Pretty.T list
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  val defined: theory -> string -> bool
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  val attribute: theory -> src -> attribute
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  val attribute_i: theory -> src -> attribute
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  val eval_thms: Proof.context -> (Facts.ref * src list) list -> thm list
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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: Proof.context -> src -> src
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  val add_attributes: (bstring * (src -> attribute) * string) list -> theory -> theory
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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 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 print_configs: Proof.context -> unit
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  val internal: (morphism -> attribute) -> src
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  val register_config: Config.value Config.T -> theory -> theory
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  val config_bool: bstring -> bool -> bool Config.T * (theory -> theory)
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  val config_int: bstring -> int -> int Config.T * (theory -> theory)
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  val config_string: bstring -> string -> string Config.T * (theory -> theory)
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  val config_bool_global: bstring -> bool -> bool Config.T * (theory -> theory)
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  val config_int_global: bstring -> int -> int Config.T * (theory -> theory)
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  val config_string_global: bstring -> string -> string Config.T * (theory -> theory)
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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 Attributes = TheoryDataFun
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(
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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 : T = NameSpace.merge_tables (eq_snd (op =)) tables handle Symtab.DUP dup =>
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    error ("Attempt to merge different versions of attribute " ^ quote dup);
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);
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fun print_attributes thy =
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  let
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    val attribs = Attributes.get thy;
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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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(* name space *)
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val intern = NameSpace.intern o #1 o Attributes.get;
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val intern_src = Args.map_name o intern;
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val extern = NameSpace.extern o #1 o Attributes.get o ProofContext.theory_of;
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(* pretty printing *)
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fun pretty_attribs _ [] = []
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  | pretty_attribs ctxt srcs =
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      [Pretty.enclose "[" "]"
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        (Pretty.commas (map (Args.pretty_src ctxt o Args.map_name (extern ctxt)) srcs))];
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(* get attributes *)
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val defined = Symtab.defined o #2 o Attributes.get;
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fun attribute_i thy =
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  let
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    val attrs = #2 (Attributes.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, _), _) => (Position.report (Markup.attribute 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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fun eval_thms ctxt args = ProofContext.note_thmss Thm.theoremK
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    [(("", []), map (apsnd (map (attribute (ProofContext.theory_of ctxt)))) args)] ctxt
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  |> fst |> maps snd;
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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) new_attrs attrs
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      handle Symtab.DUP dup => error ("Duplicate declaration of attributes " ^ quote dup);
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  in Attributes.map add thy end;
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(* attribute syntax *)
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fun syntax scan src (st, th) =
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  let val (f: attribute, st') = 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 = syntax
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  (Scan.lift (Args.add >> K add || Args.del >> K del || Scan.succeed add));
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(** parsing attributed theorems **)
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local
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val fact_name = Args.internal_fact >> K "<fact>" || Args.name;
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fun gen_thm pick = Scan.depend (fn context =>
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  let
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    val thy = Context.theory_of context;
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    val get = Context.cases (PureThy.get_fact context) ProofContext.get_fact context;
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    val get_fact = get o Facts.Fact;
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    val get_named = get o Facts.named;
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  in
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    Args.$$$ "[" |-- Args.attribs (intern thy) --| Args.$$$ "]" >> (fn srcs =>
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      let
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        val atts = map (attribute_i thy) srcs;
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        val (context', th') = Library.apply atts (context, Drule.dummy_thm);
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      in (context', pick "" [th']) end)
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    ||
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    (Scan.ahead Args.alt_name -- Args.named_fact get_fact
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      >> (fn (s, fact) => ("", Facts.Fact s, fact))
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    || Scan.ahead fact_name -- Args.position (Args.named_fact get_named) -- Scan.option Args.thm_sel
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      >> (fn ((name, (fact, pos)), sel) => (name, Facts.Named ((name, pos), sel), fact)))
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    -- Args.opt_attribs (intern thy) >> (fn ((name, thmref, fact), srcs) =>
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      let
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        val ths = Facts.select thmref fact;
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        val atts = map (attribute_i thy) srcs;
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        val (context', ths') = foldl_map (Library.apply atts) (context, ths);
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      in (context', pick name ths') end)
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  end);
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in
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val thm = gen_thm Facts.the_single;
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val multi_thm = gen_thm (K I);
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val thms = Scan.repeat multi_thm >> flat;
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end;
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(** basic attributes **)
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(* internal *)
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fun internal att = Args.src (("Pure.attribute", [Args.mk_attribute att]), Position.none);
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val internal_att =
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  syntax (Scan.lift Args.internal_attribute >> Morphism.form);
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(* tags *)
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val tagged = syntax (Scan.lift (Args.name -- Args.name) >> PureThy.tag);
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val untagged = syntax (Scan.lift Args.name >> PureThy.untag);
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val kind = syntax (Scan.lift Args.name >> PureThy.kind);
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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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(* rename_abs *)
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val rename_abs = syntax
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  (Scan.lift (Scan.repeat (Args.maybe Args.name) >> (apsnd o Drule.rename_bvars')));
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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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(* rule cases *)
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val consumes = syntax (Scan.lift (Scan.optional Args.nat 1) >> RuleCases.consumes);
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val case_names = syntax (Scan.lift (Scan.repeat1 Args.name) >> RuleCases.case_names);
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val case_conclusion =
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  syntax (Scan.lift (Args.name -- Scan.repeat Args.name) >> RuleCases.case_conclusion);
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val params = syntax (Args.and_list1 (Scan.lift (Scan.repeat Args.name)) >> RuleCases.params);
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(* rule format *)
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val rule_format = syntax (Args.mode "no_asm"
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  >> (fn true => ObjectLogic.rule_format_no_asm | false => ObjectLogic.rule_format));
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val elim_format = no_args (Thm.rule_attribute (K Tactic.make_elim));
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(* misc rules *)
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val standard = no_args (Thm.rule_attribute (K Drule.standard));
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val no_vars = no_args (Thm.rule_attribute (fn context => fn th =>
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  let
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    val ctxt = Variable.set_body false (Context.proof_of context);
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    val ((_, [th']), _) = Variable.import_thms true [th] ctxt;
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  in th' end));
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val eta_long =
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  no_args (Thm.rule_attribute (K (Conv.fconv_rule Drule.eta_long_conversion)));
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val rotated = syntax
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  (Scan.lift (Scan.optional Args.int 1) >> (fn n => Thm.rule_attribute (K (rotate_prems n))));
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(* theory setup *)
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val _ = Context.>> (Context.map_theory
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 (add_attributes
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   [("attribute", internal_att, "internal attribute"),
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    ("tagged", tagged, "tagged theorem"),
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    ("untagged", untagged, "untagged theorem"),
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    ("kind", kind, "theorem kind"),
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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"),
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    ("rename_abs", rename_abs, "rename bound variables in abstractions"),
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    ("unfolded", unfolded, "unfolded definitions"),
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    ("folded", folded, "folded definitions"),
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    ("standard", standard, "result put into standard form"),
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    ("elim_format", elim_format, "destruct rule turned into elimination rule format"),
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    ("no_vars", no_vars, "frozen schematic vars"),
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    ("eta_long", eta_long, "put theorem into eta long beta normal form"),
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    ("consumes", consumes, "number of consumed facts"),
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    ("case_names", case_names, "named rule cases"),
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    ("case_conclusion", case_conclusion, "named conclusion of rule cases"),
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    ("params", params, "named rule parameters"),
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    ("atomize", no_args ObjectLogic.declare_atomize, "declaration of atomize rule"),
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    ("rulify", no_args ObjectLogic.declare_rulify, "declaration of rulify rule"),
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    ("rule_format", rule_format, "result put into standard rule format"),
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    ("rotated", rotated, "rotated theorem premises"),
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    ("defn", add_del_args LocalDefs.defn_add LocalDefs.defn_del,
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      "declaration of definitional transformations")]));
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(** configuration options **)
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(* naming *)
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structure Configs = TheoryDataFun
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(
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  type T = Config.value Config.T Symtab.table;
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  val empty = Symtab.empty;
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  val copy = I;
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  val extend = I;
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  fun merge _ = Symtab.merge (K true);
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);
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fun print_configs ctxt =
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  let
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    val thy = ProofContext.theory_of ctxt;
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    fun prt (name, config) =
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      let val value = Config.get ctxt config in
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        Pretty.block [Pretty.str (name ^ ": " ^ Config.print_type value ^ " ="), Pretty.brk 1,
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          Pretty.str (Config.print_value value)]
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      end;
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    val configs = NameSpace.extern_table (#1 (Attributes.get thy), Configs.get thy);
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  in Pretty.writeln (Pretty.big_list "configuration options" (map prt configs)) end;
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(* concrete syntax *)
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local
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val equals = Args.$$$ "=";
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fun scan_value (Config.Bool _) =
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      equals -- Args.$$$ "false" >> K (Config.Bool false) ||
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      equals -- Args.$$$ "true" >> K (Config.Bool true) ||
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      Scan.succeed (Config.Bool true)
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  | scan_value (Config.Int _) = equals |-- Args.int >> Config.Int
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  | scan_value (Config.String _) = equals |-- Args.name >> Config.String;
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fun scan_config thy config =
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  let val config_type = Config.get_thy thy config
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  in scan_value config_type >> (K o Thm.declaration_attribute o K o Config.put_generic config) end;
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in
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fun register_config config thy =
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  let
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    val bname = Config.name_of config;
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    val name = Sign.full_name thy bname;
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  in
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    thy
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    |> add_attributes [(bname, syntax (Scan.lift (scan_config thy config) >> Morphism.form),
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      "configuration option")]
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    |> Configs.map (Symtab.update (name, config))
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  end;
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fun declare_config make coerce global name default =
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  let
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    val config_value = Config.declare global name (make default);
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    val config = coerce config_value;
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  in (config, register_config config_value) end;
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val config_bool   = declare_config Config.Bool Config.bool false;
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val config_int    = declare_config Config.Int Config.int false;
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val config_string = declare_config Config.String Config.string false;
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val config_bool_global   = declare_config Config.Bool Config.bool true;
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val config_int_global    = declare_config Config.Int Config.int true;
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val config_string_global = declare_config Config.String Config.string true;
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end;
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(* theory setup *)
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val _ = Context.>> (Context.map_theory
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 (register_config Unify.trace_bound_value #>
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  register_config Unify.search_bound_value #>
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  register_config Unify.trace_simp_value #>
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  register_config Unify.trace_types_value #>
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  register_config MetaSimplifier.simp_depth_limit_value));
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end;