1 (* Title: Pure/Thy/thy_output.ML
2 Author: Markus Wenzel, TU Muenchen
4 Theory document output with antiquotations.
9 val display_default: bool Unsynchronized.ref
10 val quotes_default: bool Unsynchronized.ref
11 val indent_default: int Unsynchronized.ref
12 val source_default: bool Unsynchronized.ref
13 val break_default: bool Unsynchronized.ref
14 val display: bool Config.T
15 val quotes: bool Config.T
16 val indent: int Config.T
17 val source: bool Config.T
18 val break: bool Config.T
19 val add_wrapper: ((unit -> string) -> unit -> string) -> Proof.context -> Proof.context
20 val add_option: string -> (string -> Proof.context -> Proof.context) -> unit
21 val defined_command: string -> bool
22 val defined_option: string -> bool
23 val print_antiquotations: unit -> unit
24 val boolean: string -> bool
25 val integer: string -> int
26 val antiquotation: string -> 'a context_parser ->
27 ({source: Args.src, state: Toplevel.state, context: Proof.context} -> 'a -> string) -> unit
28 datatype markup = Markup | MarkupEnv | Verbatim
29 val modes: string list Unsynchronized.ref
30 val eval_antiq: Scan.lexicon -> Toplevel.state -> Symbol_Pos.T list * Position.range -> string
31 val eval_antiquote: Scan.lexicon -> Toplevel.state -> Symbol_Pos.text * Position.T -> string
32 val present_thy: Scan.lexicon -> (string -> string list) -> (markup -> string -> bool) ->
33 (Toplevel.transition * Toplevel.state) list -> (Token.T, 'a) Source.source -> Buffer.T
34 val pretty_text: Proof.context -> string -> Pretty.T
35 val pretty_term: Proof.context -> term -> Pretty.T
36 val pretty_thm: Proof.context -> thm -> Pretty.T
37 val str_of_source: Args.src -> string
38 val maybe_pretty_source: (Proof.context -> 'a -> Pretty.T) -> Proof.context ->
39 Args.src -> 'a list -> Pretty.T list
40 val output: Proof.context -> Pretty.T list -> string
43 structure Thy_Output: THY_OUTPUT =
46 (** global options **)
48 val display_default = Unsynchronized.ref false;
49 val quotes_default = Unsynchronized.ref false;
50 val indent_default = Unsynchronized.ref 0;
51 val source_default = Unsynchronized.ref false;
52 val break_default = Unsynchronized.ref false;
54 val display = Attrib.setup_config_bool (Binding.name "thy_output_display") (fn _ => ! display_default);
55 val quotes = Attrib.setup_config_bool (Binding.name "thy_output_quotes") (fn _ => ! quotes_default);
56 val indent = Attrib.setup_config_int (Binding.name "thy_output_indent") (fn _ => ! indent_default);
57 val source = Attrib.setup_config_bool (Binding.name "thy_output_source") (fn _ => ! source_default);
58 val break = Attrib.setup_config_bool (Binding.name "thy_output_break") (fn _ => ! break_default);
61 structure Wrappers = Proof_Data
63 type T = ((unit -> string) -> unit -> string) list;
67 fun add_wrapper wrapper = Wrappers.map (cons wrapper);
69 val wrap = Wrappers.get #> fold (fn wrapper => fn f => wrapper f);
73 (** maintain global antiquotations **)
79 (Symtab.empty: (Args.src -> Toplevel.state -> Proof.context -> string) Symtab.table);
82 Unsynchronized.ref (Symtab.empty: (string -> Proof.context -> Proof.context) Symtab.table);
84 fun add_item kind name item tab =
85 (if not (Symtab.defined tab name) then ()
86 else warning ("Redefined document antiquotation " ^ kind ^ ": " ^ quote name);
87 Symtab.update (name, item) tab);
91 fun add_command name cmd =
92 CRITICAL (fn () => Unsynchronized.change global_commands (add_item "command" name cmd));
93 fun add_option name opt =
94 CRITICAL (fn () => Unsynchronized.change global_options (add_item "option" name opt));
96 fun defined_command name = Symtab.defined (! global_commands) name;
97 fun defined_option name = Symtab.defined (! global_options) name;
100 let val ((name, _), pos) = Args.dest_src src in
101 (case Symtab.lookup (! global_commands) name of
102 NONE => error ("Unknown document antiquotation: " ^ quote name ^ Position.str_of pos)
104 (Position.report pos (Markup.doc_antiq name);
105 (fn state => fn ctxt => f src state ctxt handle ERROR msg =>
106 cat_error msg ("The error(s) above occurred in document antiquotation: " ^
107 quote name ^ Position.str_of pos))))
110 fun option (name, s) ctxt =
111 (case Symtab.lookup (! global_options) name of
112 NONE => error ("Unknown document antiquotation option: " ^ quote name)
113 | SOME opt => opt s ctxt);
116 fun print_antiquotations () =
117 [Pretty.big_list "document antiquotation commands:"
118 (map Pretty.str (sort_strings (Symtab.keys (! global_commands)))),
119 Pretty.big_list "document antiquotation options:"
120 (map Pretty.str (sort_strings (Symtab.keys (! global_options))))]
121 |> Pretty.chunks |> Pretty.writeln;
125 fun antiquotation name scan out =
127 (fn src => fn state => fn ctxt =>
128 let val (x, ctxt') = Args.context_syntax "document antiquotation" scan src ctxt
129 in out {source = src, state = state, context = ctxt'} x end);
133 (** syntax of antiquotations **)
137 fun boolean "" = true
138 | boolean "true" = true
139 | boolean "false" = false
140 | boolean s = error ("Bad boolean value: " ^ quote s);
145 (case Library.read_int ss of (i, []) => i
146 | _ => error ("Bad integer value: " ^ quote s));
147 in (case Symbol.explode s of "-" :: ss => ~ (int ss) | ss => int ss) end;
155 Parse.xname -- Scan.optional (Parse.$$$ "=" |-- Parse.!!! Parse.xname) "";
158 Scan.optional (Parse.$$$ "[" |-- Parse.!!! (Parse.enum "," property --| Parse.$$$ "]")) [];
164 (Parse.position Parse.liberal_name -- properties -- Args.parse --| Scan.ahead Parse.eof)
165 >> (fn (((x, pos), y), z) => (y, Args.src ((x, z), pos)));
172 val modes = Unsynchronized.ref ([]: string list);
174 fun eval_antiq lex state (ss, (pos, _)) =
176 val (opts, src) = Token.read_antiq lex antiq (ss, pos);
177 fun cmd ctxt = wrap ctxt (fn () => command src state ctxt) ();
178 val preview_ctxt = fold option opts (Toplevel.presentation_context_of state);
179 val print_ctxt = Context_Position.set_visible false preview_ctxt;
180 val _ = cmd preview_ctxt;
181 in Print_Mode.with_modes (! modes @ Latex.modes) (fn () => cmd print_ctxt) () end;
183 fun eval_antiquote lex state (txt, pos) =
185 fun expand (Antiquote.Text ss) = Symbol_Pos.content ss
186 | expand (Antiquote.Antiq antiq) = eval_antiq lex state antiq
187 | expand (Antiquote.Open _) = ""
188 | expand (Antiquote.Close _) = "";
189 val ants = Antiquote.read (Symbol_Pos.explode (txt, pos), pos);
191 if Toplevel.is_toplevel state andalso not (forall Antiquote.is_text ants) then
192 error ("Unknown context -- cannot expand document antiquotations" ^ Position.str_of pos)
193 else implode (map expand ants)
198 (** present theory source **)
200 (*NB: arranging white space around command spans is a black art.*)
202 (* presentation tokens *)
206 | BasicToken of Token.T
207 | MarkupToken of string * (string * Position.T)
208 | MarkupEnvToken of string * (string * Position.T)
209 | VerbatimToken of string * Position.T;
211 fun output_token lex state =
212 let val eval = eval_antiquote lex state in
214 | BasicToken tok => Latex.output_basic tok
215 | MarkupToken (cmd, txt) => Latex.output_markup cmd (eval txt)
216 | MarkupEnvToken (cmd, txt) => Latex.output_markup_env cmd (eval txt)
217 | VerbatimToken txt => Latex.output_verbatim (eval txt)
220 fun basic_token pred (BasicToken tok) = pred tok
221 | basic_token _ _ = false;
223 val improper_token = basic_token (not o Token.is_proper);
224 val comment_token = basic_token Token.is_comment;
225 val blank_token = basic_token Token.is_blank;
226 val newline_token = basic_token Token.is_newline;
231 type command = string * Position.T * string list; (*name, position, tags*)
232 type source = (token * (string * int)) list; (*token, markup flag, meta-comment depth*)
234 datatype span = Span of command * (source * source * source * source) * bool;
236 fun make_span cmd src =
238 fun take_newline (tok :: toks) =
239 if newline_token (fst tok) then ([tok], toks, true)
240 else ([], tok :: toks, false)
241 | take_newline [] = ([], [], false);
242 val (((src_prefix, src_main), src_suffix1), (src_suffix2, src_appendix, newline)) =
244 |> take_prefix (improper_token o fst)
245 ||>> take_suffix (improper_token o fst)
246 ||>> take_prefix (comment_token o fst)
248 in Span (cmd, (src_prefix, src_main, src_suffix1 @ src_suffix2, src_appendix), newline) end;
255 fun err_bad_nesting pos =
256 error ("Bad nesting of commands in presentation" ^ pos);
258 fun edge which f (x: string option, y) =
260 else (case which (x, y) of NONE => I | SOME txt => Buffer.add (f txt));
262 val begin_tag = edge #2 Latex.begin_tag;
263 val end_tag = edge #1 Latex.end_tag;
264 fun open_delim delim e = edge #2 Latex.begin_delim e #> delim #> edge #2 Latex.end_delim e;
265 fun close_delim delim e = edge #1 Latex.begin_delim e #> delim #> edge #1 Latex.end_delim e;
269 fun present_span lex default_tags span state state'
270 (tag_stack, active_tag, newline, buffer, present_cont) =
272 val present = fold (fn (tok, (flag, 0)) =>
273 Buffer.add (output_token lex state' tok)
277 val Span ((cmd_name, cmd_pos, cmd_tags), srcs, span_newline) = span;
279 val (tag, tags) = tag_stack;
280 val tag' = try hd (fold Keyword.update_tags cmd_tags (the_list tag));
283 if is_some tag' then tag'
284 else if cmd_name = "end" andalso not (Toplevel.is_toplevel state') then NONE
285 else try hd (default_tags cmd_name);
286 val edge = (active_tag, active_tag');
289 if is_none active_tag' then span_newline else newline;
291 val nesting = Toplevel.level state' - Toplevel.level state;
293 if nesting = 0 andalso not (Toplevel.is_proof state) then tag_stack
294 else if nesting >= 0 then (tag', replicate nesting tag @ tags)
296 (case drop (~ nesting - 1) tags of
297 tgs :: tgss => (tgs, tgss)
298 | [] => err_bad_nesting (Position.str_of cmd_pos));
303 |> close_delim (fst present_cont) edge
305 |> open_delim (present (#1 srcs)) edge
307 |> present (#2 srcs);
309 if newline then (present (#3 srcs), present (#4 srcs))
310 else (I, present (#3 srcs) #> present (#4 srcs));
311 in (tag_stack', active_tag', newline', buffer', present_cont') end;
313 fun present_trailer ((_, tags), active_tag, _, buffer, present_cont) =
314 if not (null tags) then err_bad_nesting " at end of theory"
317 |> end_tag (active_tag, NONE)
318 |> close_delim (fst present_cont) (active_tag, NONE)
326 datatype markup = Markup | MarkupEnv | Verbatim;
331 Scan.one Token.is_blank -- Scan.many Token.is_comment -- Scan.one Token.is_proper;
333 val is_improper = not o (Token.is_proper orf Token.is_begin_ignore orf Token.is_end_ignore);
334 val improper = Scan.many is_improper;
335 val improper_end = Scan.repeat (Scan.unless space_proper (Scan.one is_improper));
336 val blank_end = Scan.repeat (Scan.unless space_proper (Scan.one Token.is_blank));
338 val opt_newline = Scan.option (Scan.one Token.is_newline);
341 Scan.depend (fn d => opt_newline |-- Scan.one Token.is_begin_ignore
343 Scan.depend (fn d => Scan.one Token.is_end_ignore --|
344 (if d = 0 then Scan.fail_with (K "Bad nesting of meta-comments") else opt_newline)
347 val tag = (improper -- Parse.$$$ "%" -- improper) |-- Parse.!!! (Parse.tag_name --| blank_end);
350 Scan.option ((Parse.$$$ "(" -- improper -- Parse.$$$ "in") |--
351 Parse.!!! (improper |-- Parse.xname --| (improper -- Parse.$$$ ")")));
355 fun present_thy lex default_tags is_markup command_results src =
359 val ignored = Scan.state --| ignore
360 >> (fn d => (NONE, (NoToken, ("", d))));
362 fun markup mark mk flag = Scan.peek (fn d =>
365 (Scan.one (Token.is_kind Token.Command andf is_markup mark o Token.content_of)) --
367 Parse.!!!! ((improper -- locale -- improper) |-- Parse.doc_source --| improper_end)
368 >> (fn (((tok, pos), tags), txt) =>
369 let val name = Token.content_of tok
370 in (SOME (name, pos, tags), (mk (name, txt), (flag, d))) end));
372 val command = Scan.peek (fn d =>
373 Parse.position (Scan.one (Token.is_kind Token.Command)) --
375 >> (fn ((tok, pos), tags) =>
376 let val name = Token.content_of tok
377 in (SOME (name, pos, tags), (BasicToken tok, (Latex.markup_false, d))) end));
379 val cmt = Scan.peek (fn d =>
380 Parse.$$$ "--" |-- Parse.!!!! (improper |-- Parse.doc_source)
381 >> (fn txt => (NONE, (MarkupToken ("cmt", txt), ("", d)))));
383 val other = Scan.peek (fn d =>
384 Parse.not_eof >> (fn tok => (NONE, (BasicToken tok, ("", d)))));
388 markup Markup MarkupToken Latex.markup_true ||
389 markup MarkupEnv MarkupEnvToken Latex.markup_true ||
390 markup Verbatim (VerbatimToken o #2) "" ||
391 command || cmt || other;
396 val is_eof = fn (_, (BasicToken x, _)) => Token.is_eof x | _ => false;
397 val stopper = Scan.stopper (K (NONE, (BasicToken Token.eof, ("", 0)))) is_eof;
399 val cmd = Scan.one (is_some o fst);
400 val non_cmd = Scan.one (is_none o fst andf not o is_eof) >> #2;
402 val comments = Scan.many (comment_token o fst o snd);
403 val blank = Scan.one (blank_token o fst o snd);
404 val newline = Scan.one (newline_token o fst o snd);
406 Scan.option (newline -- comments) --
407 Scan.option (newline -- comments) --
408 Scan.option (blank -- comments) -- cmd;
411 Scan.repeat non_cmd -- cmd --
412 Scan.repeat (Scan.unless before_cmd non_cmd) --
413 Scan.option (newline >> (single o snd))
414 >> (fn (((toks1, (cmd, tok2)), toks3), tok4) =>
415 make_span (the cmd) (toks1 @ (tok2 :: (toks3 @ the_default [] tok4))));
419 |> Source.filter (not o Token.is_semicolon)
420 |> Source.source' 0 Token.stopper (Scan.error (Scan.bulk token)) NONE
421 |> Source.source stopper (Scan.error (Scan.bulk span)) NONE
425 (* present commands *)
427 fun present_command tr span st st' =
428 Toplevel.setmp_thread_position tr (present_span lex default_tags span st st');
431 | present st (((tr, st'), span) :: rest) = present_command tr span st st' #> present st' rest;
433 if length command_results = length spans then
434 ((NONE, []), NONE, true, Buffer.empty, (I, I))
435 |> present Toplevel.toplevel (command_results ~~ spans)
437 else error "Messed-up outer syntax for presentation"
444 (** setup default output **)
448 val _ = add_option "show_types" (Config.put show_types o boolean);
449 val _ = add_option "show_sorts" (Config.put show_sorts o boolean);
450 val _ = add_option "show_structs" (Config.put show_structs o boolean);
451 val _ = add_option "show_question_marks" (Config.put show_question_marks o boolean);
452 val _ = add_option "show_abbrevs" (Config.put show_abbrevs o boolean);
453 val _ = add_option "names_long" (Config.put Name_Space.names_long o boolean);
454 val _ = add_option "names_short" (Config.put Name_Space.names_short o boolean);
455 val _ = add_option "names_unique" (Config.put Name_Space.names_unique o boolean);
456 val _ = add_option "eta_contract" (Config.put Syntax_Trans.eta_contract o boolean);
457 val _ = add_option "display" (Config.put display o boolean);
458 val _ = add_option "break" (Config.put break o boolean);
459 val _ = add_option "quotes" (Config.put quotes o boolean);
460 val _ = add_option "mode" (add_wrapper o Print_Mode.with_modes o single);
461 val _ = add_option "margin" (add_wrapper o setmp_CRITICAL Pretty.margin_default o integer);
462 val _ = add_option "indent" (Config.put indent o integer);
463 val _ = add_option "source" (Config.put source o boolean);
464 val _ = add_option "goals_limit" (Config.put Goal_Display.goals_limit o integer);
467 (* basic pretty printing *)
469 fun tweak_line ctxt s =
470 if Config.get ctxt display then s else Symbol.strip_blanks s;
472 fun pretty_text ctxt =
473 Pretty.chunks o map Pretty.str o map (tweak_line ctxt) o Library.split_lines;
475 fun pretty_term ctxt t = Syntax.pretty_term (Variable.auto_fixes t ctxt) t;
477 fun pretty_thm ctxt = pretty_term ctxt o Thm.full_prop_of;
479 fun pretty_term_style ctxt (style, t) =
480 pretty_term ctxt (style t);
482 fun pretty_thm_style ctxt (style, th) =
483 pretty_term ctxt (style (Thm.full_prop_of th));
485 fun pretty_term_typ ctxt (style, t) =
487 in pretty_term ctxt (Type.constraint (Term.fastype_of t') t') end;
489 fun pretty_term_typeof ctxt (style, t) =
490 Syntax.pretty_typ ctxt (Term.fastype_of (style t));
492 fun pretty_const ctxt c =
494 val t = Const (c, Consts.type_scheme (Proof_Context.consts_of ctxt) c)
495 handle TYPE (msg, _, _) => error msg;
496 val ([t'], _) = Variable.import_terms true [t] ctxt;
497 in pretty_term ctxt t' end;
499 fun pretty_abbrev ctxt s =
501 val t = Syntax.read_term (Proof_Context.set_mode Proof_Context.mode_abbrev ctxt) s;
502 fun err () = error ("Abbreviated constant expected: " ^ Syntax.string_of_term ctxt t);
503 val (head, args) = Term.strip_comb t;
504 val (c, T) = Term.dest_Const head handle TERM _ => err ();
505 val (U, u) = Consts.the_abbreviation (Proof_Context.consts_of ctxt) c
506 handle TYPE _ => err ();
507 val t' = Term.betapplys (Envir.expand_atom T (U, u), args);
508 val eq = Logic.mk_equals (t, t');
509 val ctxt' = Variable.auto_fixes eq ctxt;
510 in Proof_Context.pretty_term_abbrev ctxt' eq end;
512 fun pretty_class ctxt =
513 Pretty.str o Proof_Context.extern_class ctxt o Proof_Context.read_class ctxt;
515 fun pretty_type ctxt s =
516 let val Type (name, _) = Proof_Context.read_type_name_proper ctxt false s
517 in Pretty.str (Proof_Context.extern_type ctxt name) end;
519 fun pretty_prf full ctxt = Proof_Syntax.pretty_proof_of ctxt full;
521 fun pretty_theory ctxt name =
522 (Theory.requires (Proof_Context.theory_of ctxt) name "presentation"; Pretty.str name);
527 val str_of_source = space_implode " " o map Token.unparse o #2 o #1 o Args.dest_src;
529 fun maybe_pretty_source pretty ctxt src xs =
530 map (pretty ctxt) xs (*always pretty in order to exhibit errors!*)
531 |> (if Config.get ctxt source then K [pretty_text ctxt (str_of_source src)] else I);
533 fun output ctxt prts =
535 |> (if Config.get ctxt quotes then map Pretty.quote else I)
536 |> (if Config.get ctxt display then
537 map (Output.output o Pretty.string_of o Pretty.indent (Config.get ctxt indent))
538 #> space_implode "\\isasep\\isanewline%\n"
539 #> enclose "\\begin{isabelle}%\n" "%\n\\end{isabelle}"
541 map (Output.output o (if Config.get ctxt break then Pretty.string_of else Pretty.str_of))
542 #> space_implode "\\isasep\\isanewline%\n"
543 #> enclose "\\isa{" "}");
547 (** concrete antiquotations **)
553 fun basic_entities name scan pretty = antiquotation name scan
554 (fn {source, context, ...} => output context o maybe_pretty_source pretty context source);
556 fun basic_entities_style name scan pretty = antiquotation name scan
557 (fn {source, context, ...} => fn (style, xs) =>
559 (maybe_pretty_source (fn ctxt => fn x => pretty ctxt (style, x)) context source xs));
561 fun basic_entity name scan = basic_entities name (scan >> single);
565 val _ = basic_entities_style "thm" (Term_Style.parse -- Attrib.thms) pretty_thm_style;
566 val _ = basic_entity "prop" (Term_Style.parse -- Args.prop) pretty_term_style;
567 val _ = basic_entity "term" (Term_Style.parse -- Args.term) pretty_term_style;
568 val _ = basic_entity "term_type" (Term_Style.parse -- Args.term) pretty_term_typ;
569 val _ = basic_entity "typeof" (Term_Style.parse -- Args.term) pretty_term_typeof;
570 val _ = basic_entity "const" (Args.const_proper false) pretty_const;
571 val _ = basic_entity "abbrev" (Scan.lift Args.name_source) pretty_abbrev;
572 val _ = basic_entity "typ" Args.typ_abbrev Syntax.pretty_typ;
573 val _ = basic_entity "class" (Scan.lift Args.name) pretty_class;
574 val _ = basic_entity "type" (Scan.lift Args.name) pretty_type;
575 val _ = basic_entity "text" (Scan.lift Args.name) pretty_text;
576 val _ = basic_entities "prf" Attrib.thms (pretty_prf false);
577 val _ = basic_entities "full_prf" Attrib.thms (pretty_prf true);
578 val _ = basic_entity "theory" (Scan.lift Args.name) pretty_theory;
579 val _ = basic_entities_style "thm_style" (Term_Style.parse_bare -- Attrib.thms) pretty_thm_style;
580 val _ = basic_entity "term_style" (Term_Style.parse_bare -- Args.term) pretty_term_style;
589 fun proof_state state =
590 (case try Toplevel.proof_of state of
592 | _ => error "No proof state");
594 fun goal_state name main_goal = antiquotation name (Scan.succeed ())
595 (fn {state, context = ctxt, ...} => fn () => output ctxt
597 (Proof.pretty_goals main_goal (Proof.map_context (K ctxt) (proof_state state)))]);
601 val _ = goal_state "goals" true;
602 val _ = goal_state "subgoals" false;
609 val _ = Keyword.keyword "by";
611 val _ = antiquotation "lemma"
612 (Args.prop -- Scan.lift (Args.$$$ "by" |-- Method.parse -- Scan.option Method.parse))
613 (fn {source, context, ...} => fn (prop, methods) =>
616 (case Args.dest_src source of ((a, arg :: _), pos) => Args.src ((a, [arg]), pos));
618 |> Proof.theorem NONE (K I) [[(prop, [])]]
619 |> Proof.global_terminal_proof methods;
620 in output context (maybe_pretty_source pretty_term context prop_src [prop]) end);
627 #> map (space_implode "\\verb,|," o map (enclose "\\verb|" "|") o space_explode "|")
628 #> space_implode "\\isasep\\isanewline%\n";
632 fun ml_text name ml = antiquotation name (Scan.lift Args.name_source_position)
633 (fn {context, ...} => fn (txt, pos) =>
634 (ML_Context.eval_in (SOME context) false pos (ml pos txt);
635 Symbol_Pos.content (Symbol_Pos.explode (txt, pos))
636 |> (if Config.get context quotes then quote else I)
637 |> (if Config.get context display then enclose "\\begin{verbatim}\n" "\n\\end{verbatim}"
640 fun ml_enclose bg en pos txt =
641 ML_Lex.read Position.none bg @ ML_Lex.read pos txt @ ML_Lex.read Position.none en;
645 val _ = ml_text "ML" (ml_enclose "fn _ => (" ");");
646 val _ = ml_text "ML_type" (ml_enclose "val _ = NONE : (" ") option;");
647 val _ = ml_text "ML_struct" (ml_enclose "functor XXX() = struct structure XX = " " end;");
649 val _ = ml_text "ML_functor" (* FIXME formal treatment of functor name (!?) *)
651 ML_Lex.read Position.none ("ML_Env.check_functor " ^
652 ML_Syntax.print_string (Symbol_Pos.content (Symbol_Pos.explode (txt, pos)))));
654 val _ = ml_text "ML_text" (K (K []));
661 val _ = antiquotation "file" (Scan.lift Args.name)
662 (fn {context, ...} => fn path =>
663 if File.exists (Path.explode path) then verb_text path
664 else error ("Bad file: " ^ quote path));