src/Pure/Thy/thy_output.ML
author wenzelm
Tue Oct 21 15:01:16 2008 +0200 (2008-10-21)
changeset 28644 e2ae4a6cf166
parent 28427 cc9f7d99fb73
child 29491 4f864f851f4d
permissions -rw-r--r--
ThyOutput: export some auxiliary operations;
     1 (*  Title:      Pure/Thy/thy_output.ML
     2     ID:         $Id$
     3     Author:     Markus Wenzel, TU Muenchen
     4 
     5 Theory document output.
     6 *)
     7 
     8 signature THY_OUTPUT =
     9 sig
    10   val display: bool ref
    11   val quotes: bool ref
    12   val indent: int ref
    13   val source: bool ref
    14   val add_commands: (string * (Args.src -> Toplevel.node option -> string)) list -> unit
    15   val add_options: (string * (string -> (unit -> string) -> unit -> string)) list -> unit
    16   val defined_command: string -> bool
    17   val defined_option: string -> bool
    18   val print_antiquotations: unit -> unit
    19   val boolean: string -> bool
    20   val integer: string -> int
    21   val args: (Context.generic * Args.T list -> 'a * (Context.generic * Args.T list)) ->
    22     (Args.src -> Proof.context -> 'a -> string) -> Args.src -> Toplevel.node option -> string
    23   datatype markup = Markup | MarkupEnv | Verbatim
    24   val modes: string list ref
    25   val eval_antiquote: Scan.lexicon -> Toplevel.node option -> SymbolPos.text * Position.T -> string
    26   val present_thy: Scan.lexicon -> (string -> string list) -> (markup -> string -> bool) ->
    27     (Toplevel.transition * Toplevel.state) list -> (OuterLex.token, 'a) Source.source -> Buffer.T
    28   val str_of_source: Args.src -> string
    29   val pretty_text: string -> Pretty.T
    30   val pretty_term: Proof.context -> term -> Pretty.T
    31   val pretty_thm: Proof.context -> thm -> Pretty.T
    32   val output_list: (Proof.context -> 'a -> Pretty.T) -> Args.src ->
    33     Proof.context -> 'a list -> string
    34   val output: (Proof.context -> 'a -> Pretty.T) -> Args.src -> Proof.context -> 'a -> string
    35 end;
    36 
    37 structure ThyOutput: THY_OUTPUT =
    38 struct
    39 
    40 structure T = OuterLex;
    41 structure P = OuterParse;
    42 
    43 
    44 (** global options **)
    45 
    46 val locale = ref "";
    47 val display = ref false;
    48 val quotes = ref false;
    49 val indent = ref 0;
    50 val source = ref false;
    51 val break = ref false;
    52 
    53 
    54 
    55 (** maintain global commands **)
    56 
    57 local
    58 
    59 val global_commands =
    60   ref (Symtab.empty: (Args.src -> Toplevel.node option -> string) Symtab.table);
    61 
    62 val global_options =
    63   ref (Symtab.empty: (string -> (unit -> string) -> unit -> string) Symtab.table);
    64 
    65 fun add_item kind (name, x) tab =
    66  (if not (Symtab.defined tab name) then ()
    67   else warning ("Redefined document antiquotation " ^ kind ^ ": " ^ quote name);
    68   Symtab.update (name, x) tab);
    69 
    70 in
    71 
    72 fun add_commands xs = CRITICAL (fn () => change global_commands (fold (add_item "command") xs));
    73 fun add_options xs = CRITICAL (fn () => change global_options (fold (add_item "option") xs));
    74 
    75 fun defined_command name = Symtab.defined (! global_commands) name;
    76 fun defined_option name = Symtab.defined (! global_options) name;
    77 
    78 fun command src =
    79   let val ((name, _), pos) = Args.dest_src src in
    80     (case Symtab.lookup (! global_commands) name of
    81       NONE => error ("Unknown document antiquotation command: " ^ quote name ^ Position.str_of pos)
    82     | SOME f => (Position.report (Markup.doc_antiq name) pos; f src))
    83   end;
    84 
    85 fun option (name, s) f () =
    86   (case Symtab.lookup (! global_options) name of
    87     NONE => error ("Unknown document antiquotation option: " ^ quote name)
    88   | SOME opt => opt s f ());
    89 
    90 fun options [] f = f
    91   | options (opt :: opts) f = option opt (options opts f);
    92 
    93 
    94 fun print_antiquotations () =
    95  [Pretty.big_list "document antiquotation commands:"
    96     (map Pretty.str (sort_strings (Symtab.keys (! global_commands)))),
    97   Pretty.big_list "document antiquotation options:"
    98     (map Pretty.str (sort_strings (Symtab.keys (! global_options))))]
    99  |> Pretty.chunks |> Pretty.writeln;
   100 
   101 end;
   102 
   103 
   104 
   105 (** syntax of antiquotations **)
   106 
   107 (* option values *)
   108 
   109 fun boolean "" = true
   110   | boolean "true" = true
   111   | boolean "false" = false
   112   | boolean s = error ("Bad boolean value: " ^ quote s);
   113 
   114 fun integer s =
   115   let
   116     fun int ss =
   117       (case Library.read_int ss of (i, []) => i
   118       | _ => error ("Bad integer value: " ^ quote s));
   119   in (case Symbol.explode s of "-" :: ss => ~ (int ss) | ss => int ss) end;
   120 
   121 
   122 (* args syntax *)
   123 
   124 fun syntax scan = Args.context_syntax "document antiquotation" scan;
   125 
   126 fun args scan f src node : string =
   127   let
   128     val loc = if ! locale = "" then NONE else SOME (! locale);
   129     val (x, ctxt) = syntax scan src (Toplevel.presentation_context node loc);
   130   in f src ctxt x end;
   131 
   132 
   133 (* outer syntax *)
   134 
   135 local
   136 
   137 val property = P.xname -- Scan.optional (P.$$$ "=" |-- P.!!! P.xname) "";
   138 val properties = Scan.optional (P.$$$ "[" |-- P.!!! (P.enum "," property --| P.$$$ "]")) [];
   139 
   140 in
   141 
   142 val antiq = P.!!! (P.position P.xname -- properties -- Args.parse --| Scan.ahead P.eof)
   143   >> (fn (((x, pos), y), z) => (y, Args.src ((x, z), pos)));
   144 
   145 end;
   146 
   147 
   148 (* eval_antiquote *)
   149 
   150 val modes = ref ([]: string list);
   151 
   152 fun eval_antiquote lex node (txt, pos) =
   153   let
   154     fun expand (Antiquote.Text s) = s
   155       | expand (Antiquote.Antiq x) =
   156           let val (opts, src) = Antiquote.read_antiq lex antiq x in
   157             options opts (fn () => command src node) ();  (*preview errors!*)
   158             PrintMode.with_modes (! modes @ Latex.modes)
   159               (Output.no_warnings (options opts (fn () => command src node))) ()
   160           end
   161       | expand (Antiquote.Open _) = ""
   162       | expand (Antiquote.Close _) = "";
   163     val ants = Antiquote.read (SymbolPos.explode (txt, pos), pos);
   164   in
   165     if is_none node andalso exists Antiquote.is_antiq ants then
   166       error ("Unknown context -- cannot expand document antiquotations" ^ Position.str_of pos)
   167     else implode (map expand ants)
   168   end;
   169 
   170 
   171 
   172 (** present theory source **)
   173 
   174 (*NB: arranging white space around command spans is a black art.*)
   175 
   176 (* presentation tokens *)
   177 
   178 datatype token =
   179     NoToken
   180   | BasicToken of T.token
   181   | MarkupToken of string * (string * Position.T)
   182   | MarkupEnvToken of string * (string * Position.T)
   183   | VerbatimToken of string * Position.T;
   184 
   185 fun output_token lex state =
   186   let
   187     val eval = eval_antiquote lex (try Toplevel.node_of state)
   188   in
   189     fn NoToken => ""
   190      | BasicToken tok => Latex.output_basic tok
   191      | MarkupToken (cmd, txt) => Latex.output_markup cmd (eval txt)
   192      | MarkupEnvToken (cmd, txt) => Latex.output_markup_env cmd (eval txt)
   193      | VerbatimToken txt => Latex.output_verbatim (eval txt)
   194   end;
   195 
   196 fun basic_token pred (BasicToken tok) = pred tok
   197   | basic_token _ _ = false;
   198 
   199 val improper_token = basic_token (not o T.is_proper);
   200 val comment_token = basic_token T.is_comment;
   201 val blank_token = basic_token T.is_blank;
   202 val newline_token = basic_token T.is_newline;
   203 
   204 
   205 (* command spans *)
   206 
   207 type command = string * Position.T * string list;   (*name, position, tags*)
   208 type source = (token * (string * int)) list;        (*token, markup flag, meta-comment depth*)
   209 
   210 datatype span = Span of command * (source * source * source * source) * bool;
   211 
   212 fun make_span cmd src =
   213   let
   214     fun take_newline (tok :: toks) =
   215           if newline_token (fst tok) then ([tok], toks, true)
   216           else ([], tok :: toks, false)
   217       | take_newline [] = ([], [], false);
   218     val (((src_prefix, src_main), src_suffix1), (src_suffix2, src_appendix, newline)) =
   219       src
   220       |> take_prefix (improper_token o fst)
   221       ||>> take_suffix (improper_token o fst)
   222       ||>> take_prefix (comment_token o fst)
   223       ||> take_newline;
   224   in Span (cmd, (src_prefix, src_main, src_suffix1 @ src_suffix2, src_appendix), newline) end;
   225 
   226 
   227 (* present spans *)
   228 
   229 local
   230 
   231 fun err_bad_nesting pos =
   232   error ("Bad nesting of commands in presentation" ^ pos);
   233 
   234 fun edge which f (x: string option, y) =
   235   if x = y then I
   236   else (case which (x, y) of NONE => I | SOME txt => Buffer.add (f txt));
   237 
   238 val begin_tag = edge #2 Latex.begin_tag;
   239 val end_tag = edge #1 Latex.end_tag;
   240 fun open_delim delim e = edge #2 Latex.begin_delim e #> delim #> edge #2 Latex.end_delim e;
   241 fun close_delim delim e = edge #1 Latex.begin_delim e #> delim #> edge #1 Latex.end_delim e;
   242 
   243 in
   244 
   245 fun present_span lex default_tags span state state'
   246     (tag_stack, active_tag, newline, buffer, present_cont) =
   247   let
   248     val present = fold (fn (tok, (flag, 0)) =>
   249         Buffer.add (output_token lex state' tok)
   250         #> Buffer.add flag
   251       | _ => I);
   252 
   253     val Span ((cmd_name, cmd_pos, cmd_tags), srcs, span_newline) = span;
   254 
   255     val (tag, tags) = tag_stack;
   256     val tag' = try hd (fold OuterKeyword.update_tags cmd_tags (the_list tag));
   257 
   258     val active_tag' =
   259       if is_some tag' then tag'
   260       else if cmd_name = "end" andalso not (Toplevel.is_toplevel state') then NONE
   261       else try hd (default_tags cmd_name);
   262     val edge = (active_tag, active_tag');
   263 
   264     val newline' =
   265       if is_none active_tag' then span_newline else newline;
   266 
   267     val nesting = Toplevel.level state' - Toplevel.level state;
   268     val tag_stack' =
   269       if nesting = 0 andalso not (Toplevel.is_proof state) then tag_stack
   270       else if nesting >= 0 then (tag', replicate nesting tag @ tags)
   271       else
   272         (case Library.drop (~ nesting - 1, tags) of
   273           tgs :: tgss => (tgs, tgss)
   274         | [] => err_bad_nesting (Position.str_of cmd_pos));
   275 
   276     val buffer' =
   277       buffer
   278       |> end_tag edge
   279       |> close_delim (fst present_cont) edge
   280       |> snd present_cont
   281       |> open_delim (present (#1 srcs)) edge
   282       |> begin_tag edge
   283       |> present (#2 srcs);
   284     val present_cont' =
   285       if newline then (present (#3 srcs), present (#4 srcs))
   286       else (I, present (#3 srcs) #> present (#4 srcs));
   287   in (tag_stack', active_tag', newline', buffer', present_cont') end;
   288 
   289 fun present_trailer ((_, tags), active_tag, _, buffer, present_cont) =
   290   if not (null tags) then err_bad_nesting " at end of theory"
   291   else
   292     buffer
   293     |> end_tag (active_tag, NONE)
   294     |> close_delim (fst present_cont) (active_tag, NONE)
   295     |> snd present_cont;
   296 
   297 end;
   298 
   299 
   300 (* present_thy *)
   301 
   302 datatype markup = Markup | MarkupEnv | Verbatim;
   303 
   304 local
   305 
   306 val space_proper =
   307   Scan.one T.is_blank -- Scan.many T.is_comment -- Scan.one T.is_proper;
   308 
   309 val is_improper = not o (T.is_proper orf T.is_begin_ignore orf T.is_end_ignore);
   310 val improper = Scan.many is_improper;
   311 val improper_end = Scan.repeat (Scan.unless space_proper (Scan.one is_improper));
   312 val blank_end = Scan.repeat (Scan.unless space_proper (Scan.one T.is_blank));
   313 
   314 val opt_newline = Scan.option (Scan.one T.is_newline);
   315 
   316 val ignore =
   317   Scan.depend (fn d => opt_newline |-- Scan.one T.is_begin_ignore
   318     >> pair (d + 1)) ||
   319   Scan.depend (fn d => Scan.one T.is_end_ignore --|
   320     (if d = 0 then Scan.fail_with (K "Bad nesting of meta-comments") else opt_newline)
   321     >> pair (d - 1));
   322 
   323 val tag = (improper -- P.$$$ "%" -- improper) |-- P.!!! (P.tag_name --| blank_end);
   324 
   325 val locale =
   326   Scan.option ((P.$$$ "(" -- improper -- P.$$$ "in") |--
   327     P.!!! (improper |-- P.xname --| (improper -- P.$$$ ")")));
   328 
   329 in
   330 
   331 fun present_thy lex default_tags is_markup command_results src =
   332   let
   333     (* tokens *)
   334 
   335     val ignored = Scan.state --| ignore
   336       >> (fn d => (NONE, (NoToken, ("", d))));
   337 
   338     fun markup mark mk flag = Scan.peek (fn d =>
   339       improper |-- P.position (Scan.one (T.is_kind T.Command andf is_markup mark o T.content_of)) --
   340       Scan.repeat tag --
   341       P.!!!! ((improper -- locale -- improper) |-- P.doc_source --| improper_end)
   342       >> (fn (((tok, pos), tags), txt) =>
   343         let val name = T.content_of tok
   344         in (SOME (name, pos, tags), (mk (name, txt), (flag, d))) end));
   345 
   346     val command = Scan.peek (fn d =>
   347       P.position (Scan.one (T.is_kind T.Command)) --
   348       Scan.repeat tag
   349       >> (fn ((tok, pos), tags) =>
   350         let val name = T.content_of tok
   351         in (SOME (name, pos, tags), (BasicToken tok, (Latex.markup_false, d))) end));
   352 
   353     val cmt = Scan.peek (fn d =>
   354       P.$$$ "--" |-- P.!!!! (improper |-- P.doc_source)
   355       >> (fn txt => (NONE, (MarkupToken ("cmt", txt), ("", d)))));
   356 
   357     val other = Scan.peek (fn d =>
   358        P.not_eof >> (fn tok => (NONE, (BasicToken tok, ("", d)))));
   359 
   360     val token =
   361       ignored ||
   362       markup Markup MarkupToken Latex.markup_true ||
   363       markup MarkupEnv MarkupEnvToken Latex.markup_true ||
   364       markup Verbatim (VerbatimToken o #2) "" ||
   365       command || cmt || other;
   366 
   367 
   368     (* spans *)
   369 
   370     val is_eof = fn (_, (BasicToken x, _)) => T.is_eof x | _ => false;
   371     val stopper = Scan.stopper (K (NONE, (BasicToken T.eof, ("", 0)))) is_eof;
   372 
   373     val cmd = Scan.one (is_some o fst);
   374     val non_cmd = Scan.one (is_none o fst andf not o is_eof) >> #2;
   375 
   376     val comments = Scan.many (comment_token o fst o snd);
   377     val blank = Scan.one (blank_token o fst o snd);
   378     val newline = Scan.one (newline_token o fst o snd);
   379     val before_cmd =
   380       Scan.option (newline -- comments) --
   381       Scan.option (newline -- comments) --
   382       Scan.option (blank -- comments) -- cmd;
   383 
   384     val span =
   385       Scan.repeat non_cmd -- cmd --
   386         Scan.repeat (Scan.unless before_cmd non_cmd) --
   387         Scan.option (newline >> (single o snd))
   388       >> (fn (((toks1, (cmd, tok2)), toks3), tok4) =>
   389           make_span (the cmd) (toks1 @ (tok2 :: (toks3 @ the_default [] tok4))));
   390 
   391     val spans =
   392       src
   393       |> Source.filter (not o T.is_semicolon)
   394       |> Source.source' 0 T.stopper (Scan.error (Scan.bulk token)) NONE
   395       |> Source.source stopper (Scan.error (Scan.bulk span)) NONE
   396       |> Source.exhaust;
   397 
   398 
   399     (* present commands *)
   400 
   401     fun present_command tr span st st' =
   402       Toplevel.setmp_thread_position tr (present_span lex default_tags span st st');
   403 
   404     fun present _ [] = I
   405       | present st (((tr, st'), span) :: rest) = present_command tr span st st' #> present st' rest;
   406   in
   407     if length command_results = length spans then
   408       ((NONE, []), NONE, true, Buffer.empty, (I, I))
   409       |> present Toplevel.toplevel (command_results ~~ spans)
   410       |> present_trailer
   411     else error "Messed-up outer syntax for presentation"
   412   end;
   413 
   414 end;
   415 
   416 
   417 
   418 (** setup default output **)
   419 
   420 (* options *)
   421 
   422 val _ = add_options
   423  [("show_types", Library.setmp Syntax.show_types o boolean),
   424   ("show_sorts", Library.setmp Syntax.show_sorts o boolean),
   425   ("show_structs", Library.setmp show_structs o boolean),
   426   ("show_question_marks", Library.setmp show_question_marks o boolean),
   427   ("long_names", Library.setmp NameSpace.long_names o boolean),
   428   ("short_names", Library.setmp NameSpace.short_names o boolean),
   429   ("unique_names", Library.setmp NameSpace.unique_names o boolean),
   430   ("eta_contract", Library.setmp Syntax.eta_contract o boolean),
   431   ("locale", Library.setmp locale),
   432   ("display", Library.setmp display o boolean),
   433   ("break", Library.setmp break o boolean),
   434   ("quotes", Library.setmp quotes o boolean),
   435   ("mode", fn s => fn f => PrintMode.with_modes [s] f),
   436   ("margin", Pretty.setmp_margin o integer),
   437   ("indent", Library.setmp indent o integer),
   438   ("source", Library.setmp source o boolean),
   439   ("goals_limit", Library.setmp goals_limit o integer)];
   440 
   441 
   442 (* basic pretty printing *)
   443 
   444 val str_of_source = space_implode " " o map T.unparse o #2 o #1 o Args.dest_src;
   445 
   446 fun tweak_line s =
   447   if ! display then s else Symbol.strip_blanks s;
   448 
   449 val pretty_text = Pretty.chunks o map Pretty.str o map tweak_line o Library.split_lines;
   450 
   451 fun pretty_term ctxt t = Syntax.pretty_term (Variable.auto_fixes t ctxt) t;
   452 
   453 fun pretty_term_abbrev ctxt t = ProofContext.pretty_term_abbrev (Variable.auto_fixes t ctxt) t;
   454 
   455 fun pretty_term_typ ctxt t =
   456   Syntax.pretty_term ctxt (TypeInfer.constrain (Term.fastype_of t) t);
   457 
   458 fun pretty_term_typeof ctxt = Syntax.pretty_typ ctxt o Term.fastype_of;
   459 
   460 fun pretty_const ctxt c =
   461   let
   462     val t = Const (c, Consts.type_scheme (ProofContext.consts_of ctxt) c)
   463       handle TYPE (msg, _, _) => error msg;
   464     val ([t'], _) = Variable.import_terms true [t] ctxt;
   465   in pretty_term ctxt t' end;
   466 
   467 fun pretty_abbrev ctxt s =
   468   let
   469     val t = Syntax.parse_term ctxt s |> singleton (ProofContext.standard_infer_types ctxt);
   470     fun err () = error ("Abbreviated constant expected: " ^ Syntax.string_of_term ctxt t);
   471     val (head, args) = Term.strip_comb t;
   472     val (c, T) = Term.dest_Const head handle TERM _ => err ();
   473     val (U, u) = Consts.the_abbreviation (ProofContext.consts_of ctxt) c
   474       handle TYPE _ => err ();
   475     val t' = Term.betapplys (Envir.expand_atom T (U, u), args);
   476   in pretty_term_abbrev ctxt (Logic.mk_equals (t, t')) end;
   477 
   478 fun pretty_thm ctxt = pretty_term ctxt o Thm.full_prop_of;
   479 
   480 fun pretty_term_style ctxt (name, t) =
   481   pretty_term ctxt (TermStyle.the_style (ProofContext.theory_of ctxt) name ctxt t);
   482 
   483 fun pretty_thm_style ctxt (name, th) =
   484   pretty_term_style ctxt (name, Thm.full_prop_of th);
   485 
   486 fun pretty_prf full ctxt thms =
   487   Pretty.chunks (map (ProofSyntax.pretty_proof_of ctxt full) thms);
   488 
   489 fun pretty_theory ctxt name =
   490   (Theory.requires (ProofContext.theory_of ctxt) name "presentation"; Pretty.str name);
   491 
   492 
   493 (* Isar output *)
   494 
   495 fun output_list pretty src ctxt xs =
   496   map (pretty ctxt) xs        (*always pretty in order to exhibit errors!*)
   497   |> (if ! source then K [pretty_text (str_of_source src)] else I)
   498   |> (if ! quotes then map Pretty.quote else I)
   499   |> (if ! display then
   500     map (Output.output o Pretty.string_of o Pretty.indent (! indent))
   501     #> space_implode "\\isasep\\isanewline%\n"
   502     #> enclose "\\begin{isabelle}%\n" "%\n\\end{isabelle}"
   503   else
   504     map (Output.output o (if ! break then Pretty.string_of else Pretty.str_of))
   505     #> space_implode "\\isasep\\isanewline%\n"
   506     #> enclose "\\isa{" "}");
   507 
   508 fun output pretty src ctxt = output_list pretty src ctxt o single;
   509 
   510 fun proof_state node =
   511   (case Option.map Toplevel.proof_node node of
   512     SOME (SOME prf) => ProofNode.current prf
   513   | _ => error "No proof state");
   514 
   515 fun output_goals main_goal src node = args (Scan.succeed ()) (output (fn _ => fn _ =>
   516   Pretty.chunks (Proof.pretty_goals main_goal (proof_state node)))) src node;
   517 
   518 fun ml_val txt = "fn _ => (" ^ txt ^ ");";
   519 fun ml_type txt = "val _ = NONE : (" ^ txt ^ ") option;";
   520 fun ml_struct txt = "functor DUMMY_FUNCTOR() = struct structure DUMMY = " ^ txt ^ " end;"
   521 
   522 fun output_ml ml src ctxt (txt, pos) =
   523  (ML_Context.eval_in (SOME ctxt) false pos (ml txt);
   524   (if ! source then str_of_source src else SymbolPos.content (SymbolPos.explode (txt, pos)))
   525   |> (if ! quotes then quote else I)
   526   |> (if ! display then enclose "\\begin{verbatim}\n" "\n\\end{verbatim}"
   527   else
   528     split_lines
   529     #> map (space_implode "\\verb,|," o map (enclose "\\verb|" "|") o space_explode "|")
   530     #> space_implode "\\isasep\\isanewline%\n"));
   531 
   532 
   533 (* embedded lemmas *)
   534 
   535 fun pretty_lemma ctxt (prop, methods) =
   536   let
   537     val _ = ctxt
   538       |> Proof.theorem_i NONE (K I) [[(prop, [])]]
   539       |> Proof.global_terminal_proof methods;
   540   in pretty_term ctxt prop end;
   541 
   542 val embedded_lemma =
   543   args (Args.prop -- Scan.lift (Args.$$$ "by" |-- Method.parse -- Scan.option Method.parse))
   544     (output pretty_lemma o (fn ((a, arg :: _), p) => (Args.src ((a, [arg]), p))) o Args.dest_src);
   545 
   546 
   547 (* commands *)
   548 
   549 val _ = OuterKeyword.keyword "by";
   550 
   551 val _ = add_commands
   552  [("thm", args Attrib.thms (output_list pretty_thm)),
   553   ("thm_style", args (Scan.lift Args.liberal_name -- Attrib.thm) (output pretty_thm_style)),
   554   ("prop", args Args.prop (output pretty_term)),
   555   ("lemma", embedded_lemma),
   556   ("term", args Args.term (output pretty_term)),
   557   ("term_style", args (Scan.lift Args.liberal_name -- Args.term) (output pretty_term_style)),
   558   ("term_type", args Args.term (output pretty_term_typ)),
   559   ("typeof", args Args.term (output pretty_term_typeof)),
   560   ("const", args Args.const_proper (output pretty_const)),
   561   ("abbrev", args (Scan.lift Args.name_source) (output pretty_abbrev)),
   562   ("typ", args Args.typ_abbrev (output Syntax.pretty_typ)),
   563   ("text", args (Scan.lift Args.name) (output (K pretty_text))),
   564   ("goals", output_goals true),
   565   ("subgoals", output_goals false),
   566   ("prf", args Attrib.thms (output (pretty_prf false))),
   567   ("full_prf", args Attrib.thms (output (pretty_prf true))),
   568   ("theory", args (Scan.lift Args.name) (output pretty_theory)),
   569   ("ML", args (Scan.lift Args.name_source_position) (output_ml ml_val)),
   570   ("ML_type", args (Scan.lift Args.name_source_position) (output_ml ml_type)),
   571   ("ML_struct", args (Scan.lift Args.name_source_position) (output_ml ml_struct))];
   572 
   573 end;