src/Tools/Code/code_target.ML
author haftmann
Mon Aug 30 16:21:47 2010 +0200 (2010-08-30)
changeset 38913 d1d4d808be26
parent 38912 c79c1e4e1111
child 38914 0a49a34e5d37
permissions -rw-r--r--
tuned
     1 (*  Title:      Tools/Code/code_target.ML
     2     Author:     Florian Haftmann, TU Muenchen
     3 
     4 Generic infrastructure for target language data.
     5 *)
     6 
     7 signature CODE_TARGET =
     8 sig
     9   val cert_tyco: theory -> string -> string
    10   val read_tyco: theory -> string -> string
    11 
    12   type serializer
    13   type literals = Code_Printer.literals
    14   val add_target: string * { serializer: serializer, literals: literals,
    15     check: { env_var: string, make_destination: Path.T -> Path.T,
    16       make_command: string -> string -> string } } -> theory -> theory
    17   val extend_target: string *
    18       (string * (Code_Thingol.naming -> Code_Thingol.program -> Code_Thingol.program))
    19     -> theory -> theory
    20   val assert_target: theory -> string -> string
    21 
    22   type destination
    23   type serialization
    24   val parse_args: 'a parser -> Token.T list -> 'a
    25   val mk_serialization: (int -> Path.T option -> 'a -> unit)
    26     -> (int -> 'a -> string * string option list)
    27     -> 'a -> int -> serialization
    28   val serialize: theory -> string -> int option -> string option -> Token.T list
    29     -> Code_Thingol.naming -> Code_Thingol.program -> string list -> serialization
    30   val serialize_custom: theory -> string * serializer -> string option
    31     -> Code_Thingol.naming -> Code_Thingol.program -> string list
    32     -> string * string option list
    33   val the_literals: theory -> string -> literals
    34   val export: serialization -> unit
    35   val file: Path.T -> serialization -> unit
    36   val string: string list -> serialization -> string
    37   val code_of: theory -> string -> int option -> string
    38     -> string list -> (Code_Thingol.naming -> string list) -> string
    39   val set_default_code_width: int -> theory -> theory
    40   val shell_command: string (*theory name*) -> string (*export_code expr*) -> unit
    41 
    42   val allow_abort: string -> theory -> theory
    43   type tyco_syntax = Code_Printer.tyco_syntax
    44   type const_syntax = Code_Printer.const_syntax
    45   val add_syntax_class: string -> class -> string option -> theory -> theory
    46   val add_syntax_inst: string -> class * string -> unit option -> theory -> theory
    47   val add_syntax_tyco: string -> string -> tyco_syntax option -> theory -> theory
    48   val add_syntax_const: string -> string -> const_syntax option -> theory -> theory
    49   val add_reserved: string -> string -> theory -> theory
    50   val add_include: string -> string * (string * string list) option -> theory -> theory
    51 end;
    52 
    53 structure Code_Target : CODE_TARGET =
    54 struct
    55 
    56 open Basic_Code_Thingol;
    57 
    58 type literals = Code_Printer.literals;
    59 type tyco_syntax = Code_Printer.tyco_syntax;
    60 type const_syntax = Code_Printer.const_syntax;
    61 
    62 
    63 (** basics **)
    64 
    65 datatype destination = File of Path.T option | String of string list;
    66 type serialization = destination -> (string * string option list) option;
    67 
    68 fun export f = (f (File NONE); ());
    69 fun file path f = (f (File (SOME path)); ());
    70 fun string stmt_names f = fst (the (f (String stmt_names)));
    71 
    72 fun stmt_names_of_destination (String stmt_names) = stmt_names
    73   | stmt_names_of_destination _ = [];
    74 
    75 fun mk_serialization output _ pretty width (File path) = (output width path pretty; NONE)
    76   | mk_serialization _ string pretty width (String _) = SOME (string width pretty);
    77 
    78 
    79 (** theory data **)
    80 
    81 datatype name_syntax_table = NameSyntaxTable of {
    82   class: string Symtab.table,
    83   instance: unit Symreltab.table,
    84   tyco: Code_Printer.tyco_syntax Symtab.table,
    85   const: Code_Printer.const_syntax Symtab.table
    86 };
    87 
    88 fun mk_name_syntax_table ((class, instance), (tyco, const)) =
    89   NameSyntaxTable { class = class, instance = instance, tyco = tyco, const = const };
    90 fun map_name_syntax_table f (NameSyntaxTable { class, instance, tyco, const }) =
    91   mk_name_syntax_table (f ((class, instance), (tyco, const)));
    92 fun merge_name_syntax_table
    93   (NameSyntaxTable { class = class1, instance = instance1, tyco = tyco1, const = const1 },
    94     NameSyntaxTable { class = class2, instance = instance2, tyco = tyco2, const = const2 }) =
    95   mk_name_syntax_table (
    96     (Symtab.join (K snd) (class1, class2),
    97        Symreltab.join (K snd) (instance1, instance2)),
    98     (Symtab.join (K snd) (tyco1, tyco2),
    99        Symtab.join (K snd) (const1, const2))
   100   );
   101 
   102 type serializer =
   103   string option                         (*module name*)
   104   -> Token.T list                       (*arguments*)
   105   -> (string -> string)                 (*labelled_name*)
   106   -> string list                        (*reserved symbols*)
   107   -> (string * Pretty.T) list           (*includes*)
   108   -> (string -> string option)          (*module aliasses*)
   109   -> (string -> string option)          (*class syntax*)
   110   -> (string -> Code_Printer.tyco_syntax option)
   111   -> (string -> Code_Printer.activated_const_syntax option)
   112   -> Code_Thingol.program
   113   -> (string list * string list)        (*selected statements*)
   114   -> int
   115   -> serialization;
   116 
   117 datatype description = Fundamental of { serializer: serializer,
   118       literals: literals,
   119       check: { env_var: string, make_destination: Path.T -> Path.T,
   120         make_command: string -> string -> string } }
   121   | Extension of string *
   122       (Code_Thingol.naming -> Code_Thingol.program -> Code_Thingol.program);
   123 
   124 datatype target = Target of {
   125   serial: serial,
   126   description: description,
   127   reserved: string list,
   128   includes: (Pretty.T * string list) Symtab.table,
   129   name_syntax_table: name_syntax_table,
   130   module_alias: string Symtab.table
   131 };
   132 
   133 fun make_target ((serial, description), ((reserved, includes), (name_syntax_table, module_alias))) =
   134   Target { serial = serial, description = description, reserved = reserved, 
   135     includes = includes, name_syntax_table = name_syntax_table, module_alias = module_alias };
   136 fun map_target f ( Target { serial, description, reserved, includes, name_syntax_table, module_alias } ) =
   137   make_target (f ((serial, description), ((reserved, includes), (name_syntax_table, module_alias))));
   138 fun merge_target strict target (Target { serial = serial1, description = description,
   139   reserved = reserved1, includes = includes1,
   140   name_syntax_table = name_syntax_table1, module_alias = module_alias1 },
   141     Target { serial = serial2, description = _,
   142       reserved = reserved2, includes = includes2,
   143       name_syntax_table = name_syntax_table2, module_alias = module_alias2 }) =
   144   if serial1 = serial2 orelse not strict then
   145     make_target ((serial1, description),
   146       ((merge (op =) (reserved1, reserved2), Symtab.join (K snd) (includes1, includes2)),
   147         (merge_name_syntax_table (name_syntax_table1, name_syntax_table2),
   148           Symtab.join (K snd) (module_alias1, module_alias2))
   149     ))
   150   else
   151     error ("Incompatible targets: " ^ quote target);
   152 
   153 fun the_description (Target { description, ... }) = description;
   154 fun the_reserved (Target { reserved, ... }) = reserved;
   155 fun the_includes (Target { includes, ... }) = includes;
   156 fun the_name_syntax (Target { name_syntax_table = NameSyntaxTable x, ... }) = x;
   157 fun the_module_alias (Target { module_alias , ... }) = module_alias;
   158 
   159 structure Targets = Theory_Data
   160 (
   161   type T = (target Symtab.table * string list) * int;
   162   val empty = ((Symtab.empty, []), 80);
   163   val extend = I;
   164   fun merge (((target1, exc1), width1), ((target2, exc2), width2)) : T =
   165     ((Symtab.join (merge_target true) (target1, target2),
   166       Library.merge (op =) (exc1, exc2)), Int.max (width1, width2));
   167 );
   168 
   169 val abort_allowed = snd o fst o Targets.get;
   170 
   171 fun assert_target thy target = if Symtab.defined ((fst o fst) (Targets.get thy)) target
   172   then target
   173   else error ("Unknown code target language: " ^ quote target);
   174 
   175 fun put_target (target, seri) thy =
   176   let
   177     val lookup_target = Symtab.lookup ((fst o fst) (Targets.get thy));
   178     val _ = case seri
   179      of Extension (super, _) => if is_some (lookup_target super) then ()
   180           else error ("Unknown code target language: " ^ quote super)
   181       | _ => ();
   182     val overwriting = case (Option.map the_description o lookup_target) target
   183      of NONE => false
   184       | SOME (Extension _) => true
   185       | SOME (Fundamental _) => (case seri
   186          of Extension _ => error ("Will not overwrite existing target " ^ quote target)
   187           | _ => true);
   188     val _ = if overwriting
   189       then warning ("Overwriting existing target " ^ quote target)
   190       else (); 
   191   in
   192     thy
   193     |> (Targets.map o apfst o apfst o Symtab.update)
   194           (target, make_target ((serial (), seri), (([], Symtab.empty),
   195             (mk_name_syntax_table ((Symtab.empty, Symreltab.empty),
   196               (Symtab.empty, Symtab.empty)), Symtab.empty))))
   197   end;
   198 
   199 fun add_target (target, seri) = put_target (target, Fundamental seri);
   200 fun extend_target (target, (super, modify)) =
   201   put_target (target, Extension (super, modify));
   202 
   203 fun map_target_data target f thy =
   204   let
   205     val _ = assert_target thy target;
   206   in
   207     thy
   208     |> (Targets.map o apfst o apfst o Symtab.map_entry target o map_target) f
   209   end;
   210 
   211 fun map_reserved target =
   212   map_target_data target o apsnd o apfst o apfst;
   213 fun map_includes target =
   214   map_target_data target o apsnd o apfst o apsnd;
   215 fun map_name_syntax target =
   216   map_target_data target o apsnd o apsnd o apfst o map_name_syntax_table;
   217 fun map_module_alias target =
   218   map_target_data target o apsnd o apsnd o apsnd;
   219 
   220 fun set_default_code_width k = (Targets.map o apsnd) (K k);
   221 
   222 
   223 (** serializer usage **)
   224 
   225 (* montage *)
   226 
   227 fun the_fundamental thy =
   228   let
   229     val ((targets, _), _) = Targets.get thy;
   230     fun fundamental target = case Symtab.lookup targets target
   231      of SOME data => (case the_description data
   232          of Fundamental data => data
   233           | Extension (super, _) => fundamental super)
   234       | NONE => error ("Unknown code target language: " ^ quote target);
   235   in fundamental end;
   236 
   237 fun the_literals thy = #literals o the_fundamental thy;
   238 
   239 local
   240 
   241 fun activate_syntax lookup_name src_tab = Symtab.empty
   242   |> fold_map (fn thing_identifier => fn tab => case lookup_name thing_identifier
   243        of SOME name => (SOME name,
   244             Symtab.update_new (name, the (Symtab.lookup src_tab thing_identifier)) tab)
   245         | NONE => (NONE, tab)) (Symtab.keys src_tab)
   246   |>> map_filter I;
   247 
   248 fun activate_const_syntax thy literals src_tab naming = (Symtab.empty, naming)
   249   |> fold_map (fn c => fn (tab, naming) =>
   250       case Code_Thingol.lookup_const naming c
   251        of SOME name => let
   252               val (syn, naming') = Code_Printer.activate_const_syntax thy
   253                 literals c (the (Symtab.lookup src_tab c)) naming
   254             in (SOME name, (Symtab.update_new (name, syn) tab, naming')) end
   255         | NONE => (NONE, (tab, naming))) (Symtab.keys src_tab)
   256   |>> map_filter I;
   257 
   258 fun invoke_serializer thy abortable serializer literals reserved abs_includes 
   259     module_alias class instance tyco const module_name args naming program2 (names1, presentation_names) width =
   260   let
   261     val (names_class, class') =
   262       activate_syntax (Code_Thingol.lookup_class naming) class;
   263     val names_inst = map_filter (Code_Thingol.lookup_instance naming)
   264       (Symreltab.keys instance);
   265     val (names_tyco, tyco') =
   266       activate_syntax (Code_Thingol.lookup_tyco naming) tyco;
   267     val (names_const, (const', _)) =
   268       activate_const_syntax thy literals const naming;
   269     val names_hidden = names_class @ names_inst @ names_tyco @ names_const;
   270     val names2 = subtract (op =) names_hidden names1;
   271     val program3 = Graph.subgraph (not o member (op =) names_hidden) program2;
   272     val names_all = Graph.all_succs program3 names2;
   273     val includes = abs_includes names_all;
   274     val program4 = Graph.subgraph (member (op =) names_all) program3;
   275     val empty_funs = filter_out (member (op =) abortable)
   276       (Code_Thingol.empty_funs program3);
   277     val _ = if null empty_funs then () else error ("No code equations for "
   278       ^ commas (map (Sign.extern_const thy) empty_funs));
   279   in
   280     serializer module_name args (Code_Thingol.labelled_name thy program2) reserved includes
   281       (if is_some module_name then K module_name else Symtab.lookup module_alias)
   282       (Symtab.lookup class') (Symtab.lookup tyco') (Symtab.lookup const')
   283       program4 (names1, presentation_names) width
   284   end;
   285 
   286 fun mount_serializer thy alt_serializer target some_width raw_module_name args naming program names destination =
   287   let
   288     val ((targets, abortable), default_width) = Targets.get thy;
   289     fun collapse_hierarchy target =
   290       let
   291         val data = case Symtab.lookup targets target
   292          of SOME data => data
   293           | NONE => error ("Unknown code target language: " ^ quote target);
   294       in case the_description data
   295        of Fundamental _ => (I, data)
   296         | Extension (super, modify) => let
   297             val (modify', data') = collapse_hierarchy super
   298           in (modify' #> modify naming, merge_target false target (data', data)) end
   299       end;
   300     val (modify, data) = collapse_hierarchy target;
   301     val serializer = the_default (case the_description data
   302      of Fundamental seri => #serializer seri) alt_serializer;
   303     val presentation_names = stmt_names_of_destination destination;
   304     val module_name = if null presentation_names
   305       then raw_module_name else SOME "Code";
   306     val reserved = the_reserved data;
   307     fun select_include names_all (name, (content, cs)) =
   308       if null cs then SOME (name, content)
   309       else if exists (fn c => case Code_Thingol.lookup_const naming c
   310        of SOME name => member (op =) names_all name
   311         | NONE => false) cs
   312       then SOME (name, content) else NONE;
   313     fun includes names_all = map_filter (select_include names_all)
   314       ((Symtab.dest o the_includes) data);
   315     val module_alias = the_module_alias data 
   316     val { class, instance, tyco, const } = the_name_syntax data;
   317     val literals = the_literals thy target;
   318     val width = the_default default_width some_width;
   319   in
   320     invoke_serializer thy abortable serializer literals reserved
   321       includes module_alias class instance tyco const module_name args
   322         naming (modify program) (names, presentation_names) width destination
   323   end;
   324 
   325 in
   326 
   327 fun serialize thy = mount_serializer thy NONE;
   328 
   329 fun check thy names_cs naming program target strict args =
   330   let
   331     val module_name = "Code_Test";
   332     val { env_var, make_destination, make_command } =
   333       (#check o the_fundamental thy) target;
   334     val env_param = getenv env_var;
   335     fun ext_check env_param p =
   336       let 
   337         val destination = make_destination p;
   338         val _ = file destination (serialize thy target (SOME 80)
   339           (SOME module_name) args naming program names_cs);
   340         val cmd = make_command env_param module_name;
   341       in if bash ("cd " ^ File.shell_path p ^ " && " ^ cmd ^ " 2>&1") <> 0
   342         then error ("Code check failed for " ^ target ^ ": " ^ cmd)
   343         else ()
   344       end;
   345   in if env_param = ""
   346     then if strict
   347       then error (env_var ^ " not set; cannot check code for " ^ target)
   348       else warning (env_var ^ " not set; skipped checking code for " ^ target)
   349     else Cache_IO.with_tmp_dir "Code_Test" (ext_check env_param)
   350   end;
   351 
   352 fun serialize_custom thy (target_name, seri) module_name naming program names =
   353   mount_serializer thy (SOME seri) target_name NONE module_name [] naming program names (String [])
   354   |> the;
   355 
   356 end; (* local *)
   357 
   358 
   359 (* code presentation *)
   360 
   361 fun code_of thy target some_width module_name cs names_stmt =
   362   let
   363     val (names_cs, (naming, program)) = Code_Thingol.consts_program thy false cs;
   364   in
   365     string (names_stmt naming)
   366       (serialize thy target some_width (SOME module_name) [] naming program names_cs)
   367   end;
   368 
   369 
   370 (* code generation *)
   371 
   372 fun transitivly_non_empty_funs thy naming program =
   373   let
   374     val cs = subtract (op =) (abort_allowed thy) (Code_Thingol.empty_funs program);
   375     val names = map_filter (Code_Thingol.lookup_const naming) cs;
   376   in subtract (op =) (Graph.all_preds program names) (Graph.keys program) end;
   377 
   378 fun read_const_exprs thy cs =
   379   let
   380     val (cs1, cs2) = Code_Thingol.read_const_exprs thy cs;
   381     val (names2, (naming, program)) = Code_Thingol.consts_program thy true cs2;
   382     val names3 = transitivly_non_empty_funs thy naming program;
   383     val cs3 = map_filter (fn (c, name) =>
   384       if member (op =) names3 name then SOME c else NONE) (cs2 ~~ names2);
   385   in union (op =) cs3 cs1 end;
   386 
   387 fun export_code thy cs seris =
   388   let
   389     val (names_cs, (naming, program)) = Code_Thingol.consts_program thy false cs;
   390     fun mk_seri_dest dest = if dest = "" orelse dest = "-" then export
   391       else file (Path.explode dest);
   392     val _ = map (fn (((target, module), dest), args) =>
   393       (mk_seri_dest dest (serialize thy target NONE module args naming program names_cs))) seris;
   394   in () end;
   395 
   396 fun export_code_cmd raw_cs seris thy = export_code thy (read_const_exprs thy raw_cs) seris;
   397 
   398 fun check_code thy cs seris =
   399   let
   400     val (names_cs, (naming, program)) = Code_Thingol.consts_program thy false cs;
   401     val _ = map (fn ((target, strict), args) => check thy names_cs naming program
   402       target strict args) seris;
   403   in () end;
   404 
   405 fun check_code_cmd raw_cs seris thy = check_code thy (read_const_exprs thy raw_cs) seris;
   406 
   407 
   408 (** serializer configuration **)
   409 
   410 (* data access *)
   411 
   412 fun cert_class thy class =
   413   let
   414     val _ = AxClass.get_info thy class;
   415   in class end;
   416 
   417 fun read_class thy = cert_class thy o Sign.intern_class thy;
   418 
   419 fun cert_tyco thy tyco =
   420   let
   421     val _ = if Sign.declared_tyname thy tyco then ()
   422       else error ("No such type constructor: " ^ quote tyco);
   423   in tyco end;
   424 
   425 fun read_tyco thy = cert_tyco thy o Sign.intern_type thy;
   426 
   427 fun cert_inst thy (class, tyco) =
   428   (cert_class thy class, cert_tyco thy tyco);
   429 
   430 fun read_inst thy (raw_tyco, raw_class) =
   431   (read_class thy raw_class, read_tyco thy raw_tyco);
   432 
   433 fun gen_add_syntax (mapp, upd, del) prep_x prep_syn target raw_x some_raw_syn thy =
   434   let
   435     val x = prep_x thy raw_x;
   436     val change = case some_raw_syn
   437      of SOME raw_syn => upd (x, prep_syn thy x raw_syn)
   438       | NONE => del x;
   439   in (map_name_syntax target o mapp) change thy end;
   440 
   441 fun gen_add_syntax_class prep_class =
   442   gen_add_syntax (apfst o apfst, Symtab.update, Symtab.delete_safe) prep_class ((K o K) I);
   443 
   444 fun gen_add_syntax_inst prep_inst =
   445   gen_add_syntax (apfst o apsnd, Symreltab.update, Symreltab.delete_safe) prep_inst ((K o K) I);
   446 
   447 fun gen_add_syntax_tyco prep_tyco =
   448   gen_add_syntax (apsnd o apfst, Symtab.update, Symtab.delete_safe) prep_tyco
   449     (fn thy => fn tyco => fn syn => if fst syn <> Sign.arity_number thy tyco
   450       then error ("Number of arguments mismatch in syntax for type constructor " ^ quote tyco)
   451       else syn);
   452 
   453 fun gen_add_syntax_const prep_const =
   454   gen_add_syntax (apsnd o apsnd, Symtab.update, Symtab.delete_safe) prep_const
   455     (fn thy => fn c => fn syn =>
   456       if Code_Printer.requires_args syn > Code.args_number thy c
   457       then error ("Too many arguments in syntax for constant " ^ quote c)
   458       else syn);
   459 
   460 fun add_reserved target =
   461   let
   462     fun add sym syms = if member (op =) syms sym
   463       then error ("Reserved symbol " ^ quote sym ^ " already declared")
   464       else insert (op =) sym syms
   465   in map_reserved target o add end;
   466 
   467 fun gen_add_include read_const target args thy =
   468   let
   469     fun add (name, SOME (content, raw_cs)) incls =
   470           let
   471             val _ = if Symtab.defined incls name
   472               then warning ("Overwriting existing include " ^ name)
   473               else ();
   474             val cs = map (read_const thy) raw_cs;
   475           in Symtab.update (name, (Code_Printer.str content, cs)) incls end
   476       | add (name, NONE) incls = Symtab.delete name incls;
   477   in map_includes target (add args) thy end;
   478 
   479 val add_include = gen_add_include (K I);
   480 val add_include_cmd = gen_add_include Code.read_const;
   481 
   482 fun add_module_alias target (thyname, modlname) =
   483   let
   484     val xs = Long_Name.explode modlname;
   485     val xs' = map (Name.desymbolize true) xs;
   486   in if xs' = xs
   487     then map_module_alias target (Symtab.update (thyname, modlname))
   488     else error ("Invalid module name: " ^ quote modlname ^ "\n"
   489       ^ "perhaps try " ^ quote (Long_Name.implode xs'))
   490   end;
   491 
   492 fun gen_allow_abort prep_const raw_c thy =
   493   let
   494     val c = prep_const thy raw_c;
   495   in thy |> (Targets.map o apfst o apsnd) (insert (op =) c) end;
   496 
   497 
   498 (* concrete syntax *)
   499 
   500 local
   501 
   502 fun zip_list (x::xs) f g =
   503   f
   504   :|-- (fn y =>
   505     fold_map (fn x => g |-- f >> pair x) xs
   506     :|-- (fn xys => pair ((x, y) :: xys)));
   507 
   508 fun process_multi_syntax parse_thing parse_syntax change =
   509   (Parse.and_list1 parse_thing
   510   :|-- (fn things => Scan.repeat1 (Parse.$$$ "(" |-- Parse.name --
   511         (zip_list things parse_syntax (Parse.$$$ "and")) --| Parse.$$$ ")")))
   512   >> (Toplevel.theory oo fold)
   513     (fn (target, syns) => fold (fn (raw_x, syn) => change target raw_x syn) syns);
   514 
   515 in
   516 
   517 val add_syntax_class = gen_add_syntax_class cert_class;
   518 val add_syntax_inst = gen_add_syntax_inst cert_inst;
   519 val add_syntax_tyco = gen_add_syntax_tyco cert_tyco;
   520 val add_syntax_const = gen_add_syntax_const (K I);
   521 val allow_abort = gen_allow_abort (K I);
   522 val add_reserved = add_reserved;
   523 val add_include = add_include;
   524 
   525 val add_syntax_class_cmd = gen_add_syntax_class read_class;
   526 val add_syntax_inst_cmd = gen_add_syntax_inst read_inst;
   527 val add_syntax_tyco_cmd = gen_add_syntax_tyco read_tyco;
   528 val add_syntax_const_cmd = gen_add_syntax_const Code.read_const;
   529 val allow_abort_cmd = gen_allow_abort Code.read_const;
   530 
   531 fun parse_args f args =
   532   case Scan.read Token.stopper f args
   533    of SOME x => x
   534     | NONE => error "Bad serializer arguments";
   535 
   536 
   537 (** Isar setup **)
   538 
   539 val (inK, module_nameK, fileK, checkingK) = ("in", "module_name", "file", "checking");
   540 
   541 val code_expr_argsP = Scan.optional (Parse.$$$ "(" |-- Args.parse --| Parse.$$$ ")") [];
   542 
   543 val code_exprP =
   544   Scan.repeat1 Parse.term_group :|-- (fn raw_cs =>
   545     ((Parse.$$$ checkingK |-- Scan.repeat (Parse.name
   546       -- ((Parse.$$$ "?" |-- Scan.succeed false) || Scan.succeed true) -- code_expr_argsP))
   547       >> (fn seris => check_code_cmd raw_cs seris)
   548     || Scan.repeat (Parse.$$$ inK |-- Parse.name
   549        -- Scan.option (Parse.$$$ module_nameK |-- Parse.name)
   550        -- Scan.optional (Parse.$$$ fileK |-- Parse.name) ""
   551        -- code_expr_argsP) >> (fn seris => export_code_cmd raw_cs seris)));
   552 
   553 val _ = List.app Keyword.keyword [inK, module_nameK, fileK, checkingK];
   554 
   555 val _ =
   556   Outer_Syntax.command "code_class" "define code syntax for class" Keyword.thy_decl (
   557     process_multi_syntax Parse.xname (Scan.option Parse.string)
   558     add_syntax_class_cmd);
   559 
   560 val _ =
   561   Outer_Syntax.command "code_instance" "define code syntax for instance" Keyword.thy_decl (
   562     process_multi_syntax (Parse.xname --| Parse.$$$ "::" -- Parse.xname)
   563       (Scan.option (Parse.minus >> K ()))
   564     add_syntax_inst_cmd);
   565 
   566 val _ =
   567   Outer_Syntax.command "code_type" "define code syntax for type constructor" Keyword.thy_decl (
   568     process_multi_syntax Parse.xname Code_Printer.parse_tyco_syntax
   569     add_syntax_tyco_cmd);
   570 
   571 val _ =
   572   Outer_Syntax.command "code_const" "define code syntax for constant" Keyword.thy_decl (
   573     process_multi_syntax Parse.term_group Code_Printer.parse_const_syntax
   574     add_syntax_const_cmd);
   575 
   576 val _ =
   577   Outer_Syntax.command "code_reserved" "declare words as reserved for target language"
   578     Keyword.thy_decl (
   579     Parse.name -- Scan.repeat1 Parse.name
   580     >> (fn (target, reserveds) => (Toplevel.theory o fold (add_reserved target)) reserveds)
   581   );
   582 
   583 val _ =
   584   Outer_Syntax.command "code_include" "declare piece of code to be included in generated code"
   585     Keyword.thy_decl (
   586     Parse.name -- Parse.name -- (Parse.text :|-- (fn "-" => Scan.succeed NONE
   587       | s => Scan.optional (Parse.$$$ "attach" |-- Scan.repeat1 Parse.term) [] >> pair s >> SOME))
   588     >> (fn ((target, name), content_consts) =>
   589         (Toplevel.theory o add_include_cmd target) (name, content_consts))
   590   );
   591 
   592 val _ =
   593   Outer_Syntax.command "code_modulename" "alias module to other name" Keyword.thy_decl (
   594     Parse.name -- Scan.repeat1 (Parse.name -- Parse.name)
   595     >> (fn (target, modlnames) => (Toplevel.theory o fold (add_module_alias target)) modlnames)
   596   );
   597 
   598 val _ =
   599   Outer_Syntax.command "code_abort" "permit constant to be implemented as program abort"
   600     Keyword.thy_decl (
   601     Scan.repeat1 Parse.term_group >> (Toplevel.theory o fold allow_abort_cmd)
   602   );
   603 
   604 val _ =
   605   Outer_Syntax.command "export_code" "generate executable code for constants"
   606     Keyword.diag (Parse.!!! code_exprP >> (fn f => Toplevel.keep (f o Toplevel.theory_of)));
   607 
   608 fun shell_command thyname cmd = Toplevel.program (fn _ =>
   609   (use_thy thyname; case Scan.read Token.stopper (Parse.!!! code_exprP)
   610     ((filter Token.is_proper o Outer_Syntax.scan Position.none) cmd)
   611    of SOME f => (writeln "Now generating code..."; f (Thy_Info.get_theory thyname))
   612     | NONE => error ("Bad directive " ^ quote cmd)))
   613   handle Runtime.TOPLEVEL_ERROR => OS.Process.exit OS.Process.failure;
   614 
   615 end; (*local*)
   616 
   617 end; (*struct*)