src/Tools/Code/code_target.ML
author wenzelm
Sun Nov 08 18:43:42 2009 +0100 (2009-11-08)
changeset 33522 737589bb9bb8
parent 32966 5b21661fe618
child 33969 1e7ca47c6c3d
permissions -rw-r--r--
adapted Theory_Data;
tuned;
     1 (*  Title:      Tools/code/code_target.ML
     2     Author:     Florian Haftmann, TU Muenchen
     3 
     4 Serializer from intermediate language ("Thin-gol") to target languages.
     5 *)
     6 
     7 signature CODE_TARGET =
     8 sig
     9   include CODE_PRINTER
    10 
    11   type serializer
    12   val add_target: string * (serializer * literals) -> theory -> theory
    13   val extend_target: string *
    14       (string * (Code_Thingol.naming -> Code_Thingol.program -> Code_Thingol.program))
    15     -> theory -> theory
    16   val assert_target: theory -> string -> string
    17 
    18   type destination
    19   type serialization
    20   val parse_args: (OuterLex.token list -> 'a * OuterLex.token list)
    21     -> OuterLex.token list -> 'a
    22   val stmt_names_of_destination: destination -> string list
    23   val code_of_pretty: Pretty.T -> string
    24   val code_writeln: Pretty.T -> unit
    25   val mk_serialization: string -> ('a -> unit) option
    26     -> (Path.T option -> 'a -> unit)
    27     -> ('a -> string * string option list)
    28     -> 'a -> serialization
    29   val serialize: theory -> string -> string option -> OuterLex.token list
    30     -> Code_Thingol.naming -> Code_Thingol.program -> string list -> serialization
    31   val serialize_custom: theory -> string * (serializer * literals)
    32     -> Code_Thingol.naming -> Code_Thingol.program -> string list -> string * string option list
    33   val the_literals: theory -> string -> literals
    34   val compile: serialization -> unit
    35   val export: serialization -> unit
    36   val file: Path.T -> serialization -> unit
    37   val string: string list -> serialization -> string
    38   val code_of: theory -> string -> string
    39     -> string list -> (Code_Thingol.naming -> string list) -> string
    40   val shell_command: string (*theory name*) -> string (*export_code expr*) -> unit
    41   val code_width: int Unsynchronized.ref
    42 
    43   val allow_abort: string -> theory -> theory
    44   val add_syntax_class: string -> class -> string option -> theory -> theory
    45   val add_syntax_inst: string -> string * class -> bool -> theory -> theory
    46   val add_syntax_tyco: string -> string -> tyco_syntax option -> theory -> theory
    47   val add_syntax_const: string -> string -> proto_const_syntax option -> theory -> theory
    48   val add_reserved: string -> string -> theory -> theory
    49 end;
    50 
    51 structure Code_Target : CODE_TARGET =
    52 struct
    53 
    54 open Basic_Code_Thingol;
    55 open Code_Printer;
    56 
    57 (** basics **)
    58 
    59 datatype destination = Compile | Export | File of Path.T | String of string list;
    60 type serialization = destination -> (string * string option list) option;
    61 
    62 val code_width = Unsynchronized.ref 80; (*FIXME after Pretty module no longer depends on print mode*)
    63 fun code_setmp f = PrintMode.setmp [] (Pretty.setmp_margin_CRITICAL (!code_width) f);
    64 fun code_of_pretty p = code_setmp Pretty.string_of p ^ "\n";
    65 fun code_writeln p = Pretty.setmp_margin_CRITICAL (!code_width) Pretty.writeln p;
    66 
    67 (*FIXME why another code_setmp?*)
    68 fun compile f = (code_setmp f Compile; ());
    69 fun export f = (code_setmp f Export; ());
    70 fun file p f = (code_setmp f (File p); ());
    71 fun string stmts f = fst (the (code_setmp f (String stmts)));
    72 
    73 fun stmt_names_of_destination (String stmts) = stmts
    74   | stmt_names_of_destination _ = [];
    75 
    76 fun mk_serialization target (SOME comp) _ _ code Compile = (comp code; NONE)
    77   | mk_serialization target NONE _ _ _ Compile = error (target ^ ": no internal compilation")
    78   | mk_serialization target _ output _ code Export = (output NONE code ; NONE)
    79   | mk_serialization target _ output _ code (File file) = (output (SOME file) code; NONE)
    80   | mk_serialization target _ _ string code (String _) = SOME (string code);
    81 
    82 
    83 (** theory data **)
    84 
    85 datatype name_syntax_table = NameSyntaxTable of {
    86   class: string Symtab.table,
    87   instance: unit Symreltab.table,
    88   tyco: tyco_syntax Symtab.table,
    89   const: proto_const_syntax Symtab.table
    90 };
    91 
    92 fun mk_name_syntax_table ((class, instance), (tyco, const)) =
    93   NameSyntaxTable { class = class, instance = instance, tyco = tyco, const = const };
    94 fun map_name_syntax_table f (NameSyntaxTable { class, instance, tyco, const }) =
    95   mk_name_syntax_table (f ((class, instance), (tyco, const)));
    96 fun merge_name_syntax_table (NameSyntaxTable { class = class1, instance = instance1, tyco = tyco1, const = const1 },
    97     NameSyntaxTable { class = class2, instance = instance2, tyco = tyco2, const = const2 }) =
    98   mk_name_syntax_table (
    99     (Symtab.join (K snd) (class1, class2),
   100        Symreltab.join (K snd) (instance1, instance2)),
   101     (Symtab.join (K snd) (tyco1, tyco2),
   102        Symtab.join (K snd) (const1, const2))
   103   );
   104 
   105 type serializer =
   106   string option                         (*module name*)
   107   -> OuterLex.token list                (*arguments*)
   108   -> (string -> string)                 (*labelled_name*)
   109   -> string list                        (*reserved symbols*)
   110   -> (string * Pretty.T) list           (*includes*)
   111   -> (string -> string option)          (*module aliasses*)
   112   -> (string -> string option)          (*class syntax*)
   113   -> (string -> tyco_syntax option)
   114   -> (string -> const_syntax option)
   115   -> Code_Thingol.program
   116   -> string list                        (*selected statements*)
   117   -> serialization;
   118 
   119 datatype serializer_entry = Serializer of serializer * literals
   120   | Extends of string * (Code_Thingol.naming -> Code_Thingol.program -> Code_Thingol.program);
   121 
   122 datatype target = Target of {
   123   serial: serial,
   124   serializer: serializer_entry,
   125   reserved: string list,
   126   includes: (Pretty.T * string list) Symtab.table,
   127   name_syntax_table: name_syntax_table,
   128   module_alias: string Symtab.table
   129 };
   130 
   131 fun make_target ((serial, serializer), ((reserved, includes), (name_syntax_table, module_alias))) =
   132   Target { serial = serial, serializer = serializer, reserved = reserved, 
   133     includes = includes, name_syntax_table = name_syntax_table, module_alias = module_alias };
   134 fun map_target f ( Target { serial, serializer, reserved, includes, name_syntax_table, module_alias } ) =
   135   make_target (f ((serial, serializer), ((reserved, includes), (name_syntax_table, module_alias))));
   136 fun merge_target strict target (Target { serial = serial1, serializer = serializer,
   137   reserved = reserved1, includes = includes1,
   138   name_syntax_table = name_syntax_table1, module_alias = module_alias1 },
   139     Target { serial = serial2, serializer = _,
   140       reserved = reserved2, includes = includes2,
   141       name_syntax_table = name_syntax_table2, module_alias = module_alias2 }) =
   142   if serial1 = serial2 orelse not strict then
   143     make_target ((serial1, serializer),
   144       ((merge (op =) (reserved1, reserved2), Symtab.merge (op =) (includes1, includes2)),
   145         (merge_name_syntax_table (name_syntax_table1, name_syntax_table2),
   146           Symtab.join (K snd) (module_alias1, module_alias2))
   147     ))
   148   else
   149     error ("Incompatible serializers: " ^ quote target);
   150 
   151 structure CodeTargetData = Theory_Data
   152 (
   153   type T = target Symtab.table * string list;
   154   val empty = (Symtab.empty, []);
   155   val extend = I;
   156   fun merge ((target1, exc1), (target2, exc2)) : T =
   157     (Symtab.join (merge_target true) (target1, target2), Library.merge (op =) (exc1, exc2));
   158 );
   159 
   160 fun the_serializer (Target { serializer, ... }) = serializer;
   161 fun the_reserved (Target { reserved, ... }) = reserved;
   162 fun the_includes (Target { includes, ... }) = includes;
   163 fun the_name_syntax (Target { name_syntax_table = NameSyntaxTable x, ... }) = x;
   164 fun the_module_alias (Target { module_alias , ... }) = module_alias;
   165 
   166 val abort_allowed = snd o CodeTargetData.get;
   167 
   168 fun assert_target thy target =
   169   case Symtab.lookup (fst (CodeTargetData.get thy)) target
   170    of SOME data => target
   171     | NONE => error ("Unknown code target language: " ^ quote target);
   172 
   173 fun put_target (target, seri) thy =
   174   let
   175     val lookup_target = Symtab.lookup (fst (CodeTargetData.get thy));
   176     val _ = case seri
   177      of Extends (super, _) => if is_some (lookup_target super) then ()
   178           else error ("Unknown code target language: " ^ quote super)
   179       | _ => ();
   180     val overwriting = case (Option.map the_serializer o lookup_target) target
   181      of NONE => false
   182       | SOME (Extends _) => true
   183       | SOME (Serializer _) => (case seri
   184          of Extends _ => error ("Will not overwrite existing target " ^ quote target)
   185           | _ => true);
   186     val _ = if overwriting
   187       then warning ("Overwriting existing target " ^ quote target)
   188       else (); 
   189   in
   190     thy
   191     |> (CodeTargetData.map o apfst oo Symtab.map_default)
   192           (target, make_target ((serial (), seri), (([], Symtab.empty),
   193             (mk_name_syntax_table ((Symtab.empty, Symreltab.empty), (Symtab.empty, Symtab.empty)),
   194               Symtab.empty))))
   195           ((map_target o apfst o apsnd o K) seri)
   196   end;
   197 
   198 fun add_target (target, seri) = put_target (target, Serializer seri);
   199 fun extend_target (target, (super, modify)) =
   200   put_target (target, Extends (super, modify));
   201 
   202 fun map_target_data target f thy =
   203   let
   204     val _ = assert_target thy target;
   205   in
   206     thy
   207     |> (CodeTargetData.map o apfst o Symtab.map_entry target o map_target) f
   208   end;
   209 
   210 fun map_reserved target =
   211   map_target_data target o apsnd o apfst o apfst;
   212 fun map_includes target =
   213   map_target_data target o apsnd o apfst o apsnd;
   214 fun map_name_syntax target =
   215   map_target_data target o apsnd o apsnd o apfst o map_name_syntax_table;
   216 fun map_module_alias target =
   217   map_target_data target o apsnd o apsnd o apsnd;
   218 
   219 
   220 (** serializer configuration **)
   221 
   222 (* data access *)
   223 
   224 local
   225 
   226 fun cert_class thy class =
   227   let
   228     val _ = AxClass.get_info thy class;
   229   in class end;
   230 
   231 fun read_class thy = cert_class thy o Sign.intern_class thy;
   232 
   233 fun cert_tyco thy tyco =
   234   let
   235     val _ = if Sign.declared_tyname thy tyco then ()
   236       else error ("No such type constructor: " ^ quote tyco);
   237   in tyco end;
   238 
   239 fun read_tyco thy = cert_tyco thy o Sign.intern_type thy;
   240 
   241 fun gen_add_syntax_class prep_class prep_const target raw_class raw_syn thy =
   242   let
   243     val class = prep_class thy raw_class;
   244   in case raw_syn
   245    of SOME syntax =>
   246       thy
   247       |> (map_name_syntax target o apfst o apfst)
   248            (Symtab.update (class, syntax))
   249     | NONE =>
   250       thy
   251       |> (map_name_syntax target o apfst o apfst)
   252            (Symtab.delete_safe class)
   253   end;
   254 
   255 fun gen_add_syntax_inst prep_class prep_tyco target (raw_tyco, raw_class) add_del thy =
   256   let
   257     val inst = (prep_class thy raw_class, prep_tyco thy raw_tyco);
   258   in if add_del then
   259     thy
   260     |> (map_name_syntax target o apfst o apsnd)
   261         (Symreltab.update (inst, ()))
   262   else
   263     thy
   264     |> (map_name_syntax target o apfst o apsnd)
   265         (Symreltab.delete_safe inst)
   266   end;
   267 
   268 fun gen_add_syntax_tyco prep_tyco target raw_tyco raw_syn thy =
   269   let
   270     val tyco = prep_tyco thy raw_tyco;
   271     fun check_args (syntax as (n, _)) = if n <> Sign.arity_number thy tyco
   272       then error ("Number of arguments mismatch in syntax for type constructor " ^ quote tyco)
   273       else syntax
   274   in case raw_syn
   275    of SOME syntax =>
   276       thy
   277       |> (map_name_syntax target o apsnd o apfst)
   278            (Symtab.update (tyco, check_args syntax))
   279     | NONE =>
   280       thy
   281       |> (map_name_syntax target o apsnd o apfst)
   282            (Symtab.delete_safe tyco)
   283   end;
   284 
   285 fun gen_add_syntax_const prep_const target raw_c raw_syn thy =
   286   let
   287     val c = prep_const thy raw_c;
   288     fun check_args (syntax as (n, _)) = if n > Code.args_number thy c
   289       then error ("Too many arguments in syntax for constant " ^ quote c)
   290       else syntax;
   291   in case raw_syn
   292    of SOME syntax =>
   293       thy
   294       |> (map_name_syntax target o apsnd o apsnd)
   295            (Symtab.update (c, check_args syntax))
   296     | NONE =>
   297       thy
   298       |> (map_name_syntax target o apsnd o apsnd)
   299            (Symtab.delete_safe c)
   300   end;
   301 
   302 fun add_reserved target =
   303   let
   304     fun add sym syms = if member (op =) syms sym
   305       then error ("Reserved symbol " ^ quote sym ^ " already declared")
   306       else insert (op =) sym syms
   307   in map_reserved target o add end;
   308 
   309 fun gen_add_include read_const target args thy =
   310   let
   311     fun add (name, SOME (content, raw_cs)) incls =
   312           let
   313             val _ = if Symtab.defined incls name
   314               then warning ("Overwriting existing include " ^ name)
   315               else ();
   316             val cs = map (read_const thy) raw_cs;
   317           in Symtab.update (name, (str content, cs)) incls end
   318       | add (name, NONE) incls = Symtab.delete name incls;
   319   in map_includes target (add args) thy end;
   320 
   321 val add_include = gen_add_include Code.check_const;
   322 val add_include_cmd = gen_add_include Code.read_const;
   323 
   324 fun add_module_alias target (thyname, modlname) =
   325   let
   326     val xs = Long_Name.explode modlname;
   327     val xs' = map (Name.desymbolize true) xs;
   328   in if xs' = xs
   329     then map_module_alias target (Symtab.update (thyname, modlname))
   330     else error ("Invalid module name: " ^ quote modlname ^ "\n"
   331       ^ "perhaps try " ^ quote (Long_Name.implode xs'))
   332   end;
   333 
   334 fun gen_allow_abort prep_const raw_c thy =
   335   let
   336     val c = prep_const thy raw_c;
   337   in thy |> (CodeTargetData.map o apsnd) (insert (op =) c) end;
   338 
   339 fun zip_list (x::xs) f g =
   340   f
   341   #-> (fn y =>
   342     fold_map (fn x => g |-- f >> pair x) xs
   343     #-> (fn xys => pair ((x, y) :: xys)));
   344 
   345 
   346 (* concrete syntax *)
   347 
   348 structure P = OuterParse
   349 and K = OuterKeyword
   350 
   351 fun parse_multi_syntax parse_thing parse_syntax =
   352   P.and_list1 parse_thing
   353   #-> (fn things => Scan.repeat1 (P.$$$ "(" |-- P.name --
   354         (zip_list things parse_syntax (P.$$$ "and")) --| P.$$$ ")"));
   355 
   356 in
   357 
   358 val add_syntax_class = gen_add_syntax_class cert_class (K I);
   359 val add_syntax_inst = gen_add_syntax_inst cert_class cert_tyco;
   360 val add_syntax_tyco = gen_add_syntax_tyco cert_tyco;
   361 val add_syntax_const = gen_add_syntax_const (K I);
   362 val allow_abort = gen_allow_abort (K I);
   363 val add_reserved = add_reserved;
   364 
   365 val add_syntax_class_cmd = gen_add_syntax_class read_class Code.read_const;
   366 val add_syntax_inst_cmd = gen_add_syntax_inst read_class read_tyco;
   367 val add_syntax_tyco_cmd = gen_add_syntax_tyco read_tyco;
   368 val add_syntax_const_cmd = gen_add_syntax_const Code.read_const;
   369 val allow_abort_cmd = gen_allow_abort Code.read_const;
   370 
   371 fun the_literals thy =
   372   let
   373     val (targets, _) = CodeTargetData.get thy;
   374     fun literals target = case Symtab.lookup targets target
   375      of SOME data => (case the_serializer data
   376          of Serializer (_, literals) => literals
   377           | Extends (super, _) => literals super)
   378       | NONE => error ("Unknown code target language: " ^ quote target);
   379   in literals end;
   380 
   381 
   382 (** serializer usage **)
   383 
   384 (* montage *)
   385 
   386 local
   387 
   388 fun activate_syntax lookup_name src_tab = Symtab.empty
   389   |> fold_map (fn thing_identifier => fn tab => case lookup_name thing_identifier
   390        of SOME name => (SOME name,
   391             Symtab.update_new (name, the (Symtab.lookup src_tab thing_identifier)) tab)
   392         | NONE => (NONE, tab)) (Symtab.keys src_tab)
   393   |>> map_filter I;
   394 
   395 fun activate_const_syntax thy literals src_tab naming = (Symtab.empty, naming)
   396   |> fold_map (fn thing_identifier => fn (tab, naming) =>
   397       case Code_Thingol.lookup_const naming thing_identifier
   398        of SOME name => let
   399               val (syn, naming') = Code_Printer.activate_const_syntax thy
   400                 literals (the (Symtab.lookup src_tab thing_identifier)) naming
   401             in (SOME name, (Symtab.update_new (name, syn) tab, naming')) end
   402         | NONE => (NONE, (tab, naming))) (Symtab.keys src_tab)
   403   |>> map_filter I;
   404 
   405 fun invoke_serializer thy abortable serializer literals reserved abs_includes 
   406     module_alias class instance tyco const module args naming program2 names1 =
   407   let
   408     val (names_class, class') =
   409       activate_syntax (Code_Thingol.lookup_class naming) class;
   410     val names_inst = map_filter (Code_Thingol.lookup_instance naming)
   411       (Symreltab.keys instance);
   412     val (names_tyco, tyco') =
   413       activate_syntax (Code_Thingol.lookup_tyco naming) tyco;
   414     val (names_const, (const', _)) =
   415       activate_const_syntax thy literals const naming;
   416     val names_hidden = names_class @ names_inst @ names_tyco @ names_const;
   417     val names2 = subtract (op =) names_hidden names1;
   418     val program3 = Graph.subgraph (not o member (op =) names_hidden) program2;
   419     val names_all = Graph.all_succs program3 names2;
   420     val includes = abs_includes names_all;
   421     val program4 = Graph.subgraph (member (op =) names_all) program3;
   422     val empty_funs = filter_out (member (op =) abortable)
   423       (Code_Thingol.empty_funs program3);
   424     val _ = if null empty_funs then () else error ("No code equations for "
   425       ^ commas (map (Sign.extern_const thy) empty_funs));
   426   in
   427     serializer module args (Code_Thingol.labelled_name thy program2) reserved includes
   428       (Symtab.lookup module_alias) (Symtab.lookup class')
   429       (Symtab.lookup tyco') (Symtab.lookup const')
   430       program4 names2
   431   end;
   432 
   433 fun mount_serializer thy alt_serializer target module args naming program names =
   434   let
   435     val (targets, abortable) = CodeTargetData.get thy;
   436     fun collapse_hierarchy target =
   437       let
   438         val data = case Symtab.lookup targets target
   439          of SOME data => data
   440           | NONE => error ("Unknown code target language: " ^ quote target);
   441       in case the_serializer data
   442        of Serializer _ => (I, data)
   443         | Extends (super, modify) => let
   444             val (modify', data') = collapse_hierarchy super
   445           in (modify' #> modify naming, merge_target false target (data', data)) end
   446       end;
   447     val (modify, data) = collapse_hierarchy target;
   448     val (serializer, _) = the_default (case the_serializer data
   449      of Serializer seri => seri) alt_serializer;
   450     val reserved = the_reserved data;
   451     fun select_include names_all (name, (content, cs)) =
   452       if null cs then SOME (name, content)
   453       else if exists (fn c => case Code_Thingol.lookup_const naming c
   454        of SOME name => member (op =) names_all name
   455         | NONE => false) cs
   456       then SOME (name, content) else NONE;
   457     fun includes names_all = map_filter (select_include names_all)
   458       ((Symtab.dest o the_includes) data);
   459     val module_alias = the_module_alias data;
   460     val { class, instance, tyco, const } = the_name_syntax data;
   461     val literals = the_literals thy target;
   462   in
   463     invoke_serializer thy abortable serializer literals reserved
   464       includes module_alias class instance tyco const module args naming (modify program) names
   465   end;
   466 
   467 in
   468 
   469 fun serialize thy = mount_serializer thy NONE;
   470 
   471 fun serialize_custom thy (target_name, seri) naming program names =
   472   mount_serializer thy (SOME seri) target_name NONE [] naming program names (String [])
   473   |> the;
   474 
   475 end; (* local *)
   476 
   477 fun parse_args f args =
   478   case Scan.read OuterLex.stopper f args
   479    of SOME x => x
   480     | NONE => error "Bad serializer arguments";
   481 
   482 
   483 (* code presentation *)
   484 
   485 fun code_of thy target module_name cs names_stmt =
   486   let
   487     val (names_cs, (naming, program)) = Code_Thingol.consts_program thy cs;
   488   in
   489     string (names_stmt naming) (serialize thy target (SOME module_name) []
   490       naming program names_cs)
   491   end;
   492 
   493 
   494 (* code generation *)
   495 
   496 fun transitivly_non_empty_funs thy naming program =
   497   let
   498     val cs = subtract (op =) (abort_allowed thy) (Code_Thingol.empty_funs program);
   499     val names = map_filter (Code_Thingol.lookup_const naming) cs;
   500   in subtract (op =) (Graph.all_preds program names) (Graph.keys program) end;
   501 
   502 fun read_const_exprs thy cs =
   503   let
   504     val (cs1, cs2) = Code_Thingol.read_const_exprs thy cs;
   505     val (names3, (naming, program)) = Code_Thingol.consts_program thy cs2;
   506     val names4 = transitivly_non_empty_funs thy naming program;
   507     val cs5 = map_filter
   508       (fn (c, name) => if member (op =) names4 name then SOME c else NONE) (cs2 ~~ names3);
   509   in fold (insert (op =)) cs5 cs1 end;
   510 
   511 fun cached_program thy = 
   512   let
   513     val (naming, program) = Code_Thingol.cached_program thy;
   514   in (transitivly_non_empty_funs thy naming program, (naming, program)) end
   515 
   516 fun export_code thy cs seris =
   517   let
   518     val (cs', (naming, program)) = if null cs then cached_program thy
   519       else Code_Thingol.consts_program thy cs;
   520     fun mk_seri_dest dest = case dest
   521      of NONE => compile
   522       | SOME "-" => export
   523       | SOME f => file (Path.explode f)
   524     val _ = map (fn (((target, module), dest), args) =>
   525       (mk_seri_dest dest (serialize thy target module args naming program cs'))) seris;
   526   in () end;
   527 
   528 fun export_code_cmd raw_cs seris thy = export_code thy (read_const_exprs thy raw_cs) seris;
   529 
   530 
   531 (** Isar setup **)
   532 
   533 val (inK, module_nameK, fileK) = ("in", "module_name", "file");
   534 
   535 val code_exprP =
   536   (Scan.repeat P.term_group
   537   -- Scan.repeat (P.$$$ inK |-- P.name
   538      -- Scan.option (P.$$$ module_nameK |-- P.name)
   539      -- Scan.option (P.$$$ fileK |-- P.name)
   540      -- Scan.optional (P.$$$ "(" |-- Args.parse --| P.$$$ ")") []
   541   ) >> (fn (raw_cs, seris) => export_code_cmd raw_cs seris));
   542 
   543 val _ = List.app OuterKeyword.keyword [inK, module_nameK, fileK];
   544 
   545 val _ =
   546   OuterSyntax.command "code_class" "define code syntax for class" K.thy_decl (
   547     parse_multi_syntax P.xname (Scan.option P.string)
   548     >> (Toplevel.theory oo fold) (fn (target, syns) =>
   549           fold (fn (raw_class, syn) => add_syntax_class_cmd target raw_class syn) syns)
   550   );
   551 
   552 val _ =
   553   OuterSyntax.command "code_instance" "define code syntax for instance" K.thy_decl (
   554     parse_multi_syntax (P.xname --| P.$$$ "::" -- P.xname)
   555       ((P.minus >> K true) || Scan.succeed false)
   556     >> (Toplevel.theory oo fold) (fn (target, syns) =>
   557           fold (fn (raw_inst, add_del) => add_syntax_inst_cmd target raw_inst add_del) syns)
   558   );
   559 
   560 val _ =
   561   OuterSyntax.command "code_type" "define code syntax for type constructor" K.thy_decl (
   562     parse_multi_syntax P.xname (parse_syntax I)
   563     >> (Toplevel.theory oo fold) (fn (target, syns) =>
   564           fold (fn (raw_tyco, syn) => add_syntax_tyco_cmd target raw_tyco syn) syns)
   565   );
   566 
   567 val _ =
   568   OuterSyntax.command "code_const" "define code syntax for constant" K.thy_decl (
   569     parse_multi_syntax P.term_group (parse_syntax fst)
   570     >> (Toplevel.theory oo fold) (fn (target, syns) =>
   571       fold (fn (raw_const, syn) => add_syntax_const_cmd target raw_const
   572         (Code_Printer.simple_const_syntax syn)) syns)
   573   );
   574 
   575 val _ =
   576   OuterSyntax.command "code_reserved" "declare words as reserved for target language" K.thy_decl (
   577     P.name -- Scan.repeat1 P.name
   578     >> (fn (target, reserveds) => (Toplevel.theory o fold (add_reserved target)) reserveds)
   579   );
   580 
   581 val _ =
   582   OuterSyntax.command "code_include" "declare piece of code to be included in generated code" K.thy_decl (
   583     P.name -- P.name -- (P.text :|-- (fn "-" => Scan.succeed NONE
   584       | s => Scan.optional (P.$$$ "attach" |-- Scan.repeat1 P.term) [] >> pair s >> SOME))
   585     >> (fn ((target, name), content_consts) =>
   586         (Toplevel.theory o add_include_cmd target) (name, content_consts))
   587   );
   588 
   589 val _ =
   590   OuterSyntax.command "code_modulename" "alias module to other name" K.thy_decl (
   591     P.name -- Scan.repeat1 (P.name -- P.name)
   592     >> (fn (target, modlnames) => (Toplevel.theory o fold (add_module_alias target)) modlnames)
   593   );
   594 
   595 val _ =
   596   OuterSyntax.command "code_abort" "permit constant to be implemented as program abort" K.thy_decl (
   597     Scan.repeat1 P.term_group >> (Toplevel.theory o fold allow_abort_cmd)
   598   );
   599 
   600 val _ =
   601   OuterSyntax.command "export_code" "generate executable code for constants"
   602     K.diag (P.!!! code_exprP >> (fn f => Toplevel.keep (f o Toplevel.theory_of)));
   603 
   604 fun shell_command thyname cmd = Toplevel.program (fn _ =>
   605   (use_thy thyname; case Scan.read OuterLex.stopper (P.!!! code_exprP)
   606     ((filter OuterLex.is_proper o OuterSyntax.scan Position.none) cmd)
   607    of SOME f => (writeln "Now generating code..."; f (theory thyname))
   608     | NONE => error ("Bad directive " ^ quote cmd)))
   609   handle TOPLEVEL_ERROR => OS.Process.exit OS.Process.failure;
   610 
   611 end; (*local*)
   612 
   613 end; (*struct*)