(*  Title:      Pure/Isar/attrib.ML

     ID:         $Id$

     Author:     Markus Wenzel, TU Muenchen

 Symbolic representation of attributes -- with name and syntax.

 *)

 signature BASIC_ATTRIB =

 sig

   val print_attributes: theory -> unit

 end;

 signature ATTRIB =

 sig

   include BASIC_ATTRIB

   type src

   val intern: theory -> xstring -> string

   val intern_src: theory -> src -> src

   val pretty_attribs: Proof.context -> src list -> Pretty.T list

   val attribute: theory -> src -> attribute

   val attribute_i: theory -> src -> attribute

   val eval_thms: Proof.context -> (Facts.ref * src list) list -> thm list

   val map_specs: ('a -> 'att) ->

     (('c * 'a list) * 'd) list -> (('c * 'att list) * 'd) list

   val map_facts: ('a -> 'att) ->

     (('c * 'a list) * ('d * 'a list) list) list ->

     (('c * 'att list) * ('d * 'att list) list) list

   val crude_closure: Proof.context -> src -> src

   val add_attributes: (bstring * (src -> attribute) * string) list -> theory -> theory

   val syntax: (Context.generic * Args.T list ->

     attribute * (Context.generic * Args.T list)) -> src -> attribute

   val no_args: attribute -> src -> attribute

   val add_del_args: attribute -> attribute -> src -> attribute

   val thm: Context.generic * Args.T list -> thm * (Context.generic * Args.T list)

   val thms: Context.generic * Args.T list -> thm list * (Context.generic * Args.T list)

   val multi_thm: Context.generic * Args.T list -> thm list * (Context.generic * Args.T list)

   val print_configs: Proof.context -> unit

   val internal: (morphism -> attribute) -> src

   val register_config: Config.value Config.T -> theory -> theory

   val config_bool: bstring -> bool -> bool Config.T * (theory -> theory)

   val config_int: bstring -> int -> int Config.T * (theory -> theory)

   val config_string: bstring -> string -> string Config.T * (theory -> theory)

   val config_bool_global: bstring -> bool -> bool Config.T * (theory -> theory)

   val config_int_global: bstring -> int -> int Config.T * (theory -> theory)

   val config_string_global: bstring -> string -> string Config.T * (theory -> theory)

 end;

 structure Attrib: ATTRIB =

 struct

 type src = Args.src;

 (** named attributes **)

 (* theory data *)

 structure Attributes = TheoryDataFun

 (

   type T = (((src -> attribute) * string) * stamp) NameSpace.table;

   val empty = NameSpace.empty_table;

   val copy = I;

   val extend = I;

   fun merge _ tables : T = NameSpace.merge_tables (eq_snd (op =)) tables handle Symtab.DUP dup =>

     error ("Attempt to merge different versions of attribute " ^ quote dup);

 );

 fun print_attributes thy =

   let

     val attribs = Attributes.get thy;

     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 attribs))]

     |> Pretty.chunks |> Pretty.writeln

   end;

 (* name space *)

 val intern = NameSpace.intern o #1 o Attributes.get;

 val intern_src = Args.map_name o intern;

 val extern = NameSpace.extern o #1 o Attributes.get o ProofContext.theory_of;

 (* pretty printing *)

 fun pretty_attribs _ [] = []

   | pretty_attribs ctxt srcs =

       [Pretty.enclose "[" "]"

         (Pretty.commas (map (Args.pretty_src ctxt o Args.map_name (extern ctxt)) srcs))];

 (* get attributes *)

 fun attribute_i thy =

   let

     val attrs = #2 (Attributes.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 ((att, _), _) => att src)

       end;

   in attr end;

 fun attribute thy = attribute_i thy o intern_src thy;

 fun eval_thms ctxt args = ProofContext.note_thmss Thm.theoremK

   [(("", []), map (apsnd (map (attribute (ProofContext.theory_of ctxt)))) args)] ctxt

   |> (flat o map snd o fst);

 (* attributed declarations *)

 fun map_specs f = map (apfst (apsnd (map f)));

 fun map_facts f = map (apfst (apsnd (map f)) o apsnd (map (apsnd (map f))));

 (* crude_closure *)

 (*Produce closure without knowing facts in advance! The following

   works reasonably well for attribute parsers that do not peek at the

   thm structure.*)

 fun crude_closure ctxt src =

  (try (fn () => attribute_i (ProofContext.theory_of ctxt) src

     (Context.Proof ctxt, Drule.asm_rl)) ();

   Args.closure src);

 (* add_attributes *)

 fun add_attributes raw_attrs thy =

   let

     val new_attrs =

       raw_attrs |> map (fn (name, att, comment) => (name, ((att, comment), stamp ())));

     fun add attrs = NameSpace.extend_table (Sign.naming_of thy) new_attrs attrs

       handle Symtab.DUP dup => error ("Duplicate declaration of attributes " ^ quote dup);

   in Attributes.map add thy end;

 (* attribute syntax *)

 fun syntax scan src (st, th) =

   let val (f: attribute, st') = 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 = syntax

   (Scan.lift (Args.add >> K add || Args.del >> K del || Scan.succeed add));

 (** parsing attributed theorems **)

 local

 val fact_name = Args.internal_fact >> K "<fact>" || Args.name;

 fun gen_thm pick = Scan.depend (fn context =>

   let

     val thy = Context.theory_of context;

     val get = Context.cases PureThy.get_fact ProofContext.get_fact context;

     fun get_fact s = get (Facts.Fact s);

     fun get_named s = get (Facts.Named (s, NONE));

   in

     Args.$$$ "[" |-- Args.attribs (intern thy) --| Args.$$$ "]" >> (fn srcs =>

       let

         val atts = map (attribute_i thy) srcs;

         val (context', th') = Library.apply atts (context, Drule.dummy_thm);

       in (context', pick "" [th']) end)

     ||

     (Scan.ahead Args.alt_name -- Args.named_fact get_fact

       >> (fn (s, fact) => ("", Facts.Fact s, fact))

     || Scan.ahead fact_name -- Args.named_fact get_named -- Scan.option Args.thm_sel

       >> (fn ((name, fact), sel) => (name, Facts.Named (name, sel), fact)))

     -- Args.opt_attribs (intern thy) >> (fn ((name, thmref, fact), srcs) =>

       let

         val ths = Facts.select thmref fact;

         val atts = map (attribute_i thy) srcs;

         val (context', ths') = foldl_map (Library.apply atts) (context, ths);

       in (context', pick name ths') end)

   end);

 in

 val thm = gen_thm Facts.the_single;

 val multi_thm = gen_thm (K I);

 val thms = Scan.repeat multi_thm >> flat;

 end;

 (** basic attributes **)

 (* internal *)

 fun internal att = Args.src (("Pure.attribute", [Args.mk_attribute att]), Position.none);

 val internal_att =

   syntax (Scan.lift Args.internal_attribute >> Morphism.form);

 (* tags *)

 val tagged = syntax (Scan.lift (Args.name -- Args.name) >> PureThy.tag);

 val untagged = syntax (Scan.lift Args.name >> PureThy.untag);

 val kind = syntax (Scan.lift Args.name >> PureThy.kind);

 (* rule composition *)

 val COMP_att =

   syntax (Scan.lift (Scan.optional (Args.bracks Args.nat) 1) -- thm

     >> (fn (i, B) => Thm.rule_attribute (fn _ => fn A => Drule.compose_single (A, i, B))));

 val THEN_att =

   syntax (Scan.lift (Scan.optional (Args.bracks Args.nat) 1) -- thm

     >> (fn (i, B) => Thm.rule_attribute (fn _ => fn A => A RSN (i, B))));

 val OF_att =

   syntax (thms >> (fn Bs => Thm.rule_attribute (fn _ => fn A => Bs MRS A)));

 (* rename_abs *)

 val rename_abs = syntax

   (Scan.lift (Scan.repeat (Args.maybe Args.name) >> (apsnd o Drule.rename_bvars')));

 (* unfold / fold definitions *)

 fun unfolded_syntax rule =

   syntax (thms >>

     (fn ths => Thm.rule_attribute (fn context => rule (Context.proof_of context) ths)));

 val unfolded = unfolded_syntax LocalDefs.unfold;

 val folded = unfolded_syntax LocalDefs.fold;

 (* rule cases *)

 val consumes = syntax (Scan.lift (Scan.optional Args.nat 1) >> RuleCases.consumes);

 val case_names = syntax (Scan.lift (Scan.repeat1 Args.name) >> RuleCases.case_names);

 val case_conclusion =

   syntax (Scan.lift (Args.name -- Scan.repeat Args.name) >> RuleCases.case_conclusion);

 val params = syntax (Args.and_list1 (Scan.lift (Scan.repeat Args.name)) >> RuleCases.params);

 (* rule format *)

 val rule_format = syntax (Args.mode "no_asm"

   >> (fn true => ObjectLogic.rule_format_no_asm | false => ObjectLogic.rule_format));

 val elim_format = no_args (Thm.rule_attribute (K Tactic.make_elim));

 (* misc rules *)

 val standard = no_args (Thm.rule_attribute (K Drule.standard));

 val no_vars = no_args (Thm.rule_attribute (fn ctxt => fn th =>

   let val ((_, [th']), _) = Variable.import_thms true [th] (Context.proof_of ctxt)

   in th' end));

 val eta_long =

   no_args (Thm.rule_attribute (K (Conv.fconv_rule Drule.eta_long_conversion)));

 val rotated = syntax

   (Scan.lift (Scan.optional Args.int 1) >> (fn n => Thm.rule_attribute (K (rotate_prems n))));

 (* theory setup *)

 val _ = Context.add_setup

  (add_attributes

    [("attribute", internal_att, "internal attribute"),

     ("tagged", tagged, "tagged theorem"),

     ("untagged", untagged, "untagged theorem"),

     ("kind", kind, "theorem kind"),

     ("COMP", COMP_att, "direct composition with rules (no lifting)"),

     ("THEN", THEN_att, "resolution with rule"),

     ("OF", OF_att, "rule applied to facts"),

     ("rename_abs", rename_abs, "rename bound variables in abstractions"),

     ("unfolded", unfolded, "unfolded definitions"),

     ("folded", folded, "folded definitions"),

     ("standard", standard, "result put into standard form"),

     ("elim_format", elim_format, "destruct rule turned into elimination rule format"),

     ("no_vars", no_vars, "frozen schematic vars"),

     ("eta_long", eta_long, "put theorem into eta long beta normal form"),

     ("consumes", consumes, "number of consumed facts"),

     ("case_names", case_names, "named rule cases"),

     ("case_conclusion", case_conclusion, "named conclusion of rule cases"),

     ("params", params, "named rule parameters"),

     ("atomize", no_args ObjectLogic.declare_atomize, "declaration of atomize rule"),

     ("rulify", no_args ObjectLogic.declare_rulify, "declaration of rulify rule"),

     ("rule_format", rule_format, "result put into standard rule format"),

     ("rotated", rotated, "rotated theorem premises"),

     ("defn", add_del_args LocalDefs.defn_add LocalDefs.defn_del,

       "declaration of definitional transformations")]);

 (** configuration options **)

 (* naming *)

 structure Configs = TheoryDataFun

 (

   type T = Config.value Config.T Symtab.table;

   val empty = Symtab.empty;

   val copy = I;

   val extend = I;

   fun merge _ = Symtab.merge (K true);

 );

 fun print_configs ctxt =

   let

     val thy = ProofContext.theory_of ctxt;

     fun prt (name, config) =

       let val value = Config.get ctxt config in

         Pretty.block [Pretty.str (name ^ ": " ^ Config.print_type value ^ " ="), Pretty.brk 1,

           Pretty.str (Config.print_value value)]

       end;

     val configs = NameSpace.extern_table (#1 (Attributes.get thy), Configs.get thy);

   in Pretty.writeln (Pretty.big_list "configuration options" (map prt configs)) end;

 (* concrete syntax *)

 local

 val equals = Args.$$$ "=";

 fun scan_value (Config.Bool _) =

       equals -- Args.$$$ "false" >> K (Config.Bool false) ||

       equals -- Args.$$$ "true" >> K (Config.Bool true) ||

       Scan.succeed (Config.Bool true)

   | scan_value (Config.Int _) = equals |-- Args.int >> Config.Int

   | scan_value (Config.String _) = equals |-- Args.name >> Config.String;

 fun scan_config thy config =

   let val config_type = Config.get_thy thy config

   in scan_value config_type >> (K o Thm.declaration_attribute o K o Config.put_generic config) end;

 in

 fun register_config config thy =

   let

     val bname = Config.name_of config;

     val name = Sign.full_name thy bname;

   in

     thy

     |> add_attributes [(bname, syntax (Scan.lift (scan_config thy config) >> Morphism.form),

       "configuration option")]

     |> Configs.map (Symtab.update (name, config))

   end;

 fun declare_config make coerce global name default =

   let

     val config_value = Config.declare global name (make default);

     val config = coerce config_value;

   in (config, register_config config_value) end;

 val config_bool   = declare_config Config.Bool Config.bool false;

 val config_int    = declare_config Config.Int Config.int false;

 val config_string = declare_config Config.String Config.string false;

 val config_bool_global   = declare_config Config.Bool Config.bool true;

 val config_int_global    = declare_config Config.Int Config.int true;

 val config_string_global = declare_config Config.String Config.string true;

 end;

 (* theory setup *)

 val _ = Context.add_setup

  (register_config Unify.trace_bound_value #>

   register_config Unify.search_bound_value #>

   register_config Unify.trace_simp_value #>

   register_config Unify.trace_types_value #>

   register_config MetaSimplifier.simp_depth_limit_value);

 end;

 structure BasicAttrib: BASIC_ATTRIB = Attrib;

 open BasicAttrib;