(* Title: Pure/Isar/token.ML
Author: Markus Wenzel, TU Muenchen
Outer token syntax for Isabelle/Isar.
*)
signature TOKEN =
sig
datatype kind =
(*immediate source*)
Command | Keyword | Ident | Long_Ident | Sym_Ident | Var | Type_Ident | Type_Var | Nat |
Float | Space |
(*delimited content*)
String | Alt_String | Verbatim | Cartouche | Comment of Comment.kind option |
(*special content*)
Error of string | EOF
val str_of_kind: kind -> string
type file = {src_path: Path.T, lines: string list, digest: SHA1.digest, pos: Position.T}
type T
type src = T list
type name_value = {name: string, kind: string, print: Proof.context -> Markup.T * xstring}
datatype value =
Source of src |
Literal of bool * Markup.T |
Name of name_value * morphism |
Typ of typ |
Term of term |
Fact of string option * thm list |
Attribute of morphism -> attribute |
Declaration of declaration |
Files of file Exn.result list
val pos_of: T -> Position.T
val range_of: T list -> Position.range
val eof: T
val is_eof: T -> bool
val not_eof: T -> bool
val stopper: T Scan.stopper
val kind_of: T -> kind
val is_kind: kind -> T -> bool
val is_command: T -> bool
val keyword_with: (string -> bool) -> T -> bool
val is_command_modifier: T -> bool
val ident_with: (string -> bool) -> T -> bool
val is_proper: T -> bool
val is_improper: T -> bool
val is_comment: T -> bool
val is_informal_comment: T -> bool
val is_formal_comment: T -> bool
val is_begin_ignore: T -> bool
val is_end_ignore: T -> bool
val is_error: T -> bool
val is_space: T -> bool
val is_blank: T -> bool
val is_newline: T -> bool
val content_of: T -> string
val input_of: T -> Input.source
val inner_syntax_of: T -> string
val keyword_markup: bool * Markup.T -> string -> Markup.T
val completion_report: T -> Position.report_text list
val reports: Keyword.keywords -> T -> Position.report_text list
val markups: Keyword.keywords -> T -> Markup.T list
val unparse: T -> string
val print: T -> string
val text_of: T -> string * string
val get_files: T -> file Exn.result list
val put_files: file Exn.result list -> T -> T
val get_value: T -> value option
val reports_of_value: T -> Position.report list
val name_value: name_value -> value
val get_name: T -> name_value option
val declare_maxidx: T -> Proof.context -> Proof.context
val map_facts: (string option -> thm list -> thm list) -> T -> T
val transform: morphism -> T -> T
val init_assignable: T -> T
val assign: value option -> T -> T
val evaluate: ('a -> value) -> (T -> 'a) -> T -> 'a
val closure: T -> T
val pretty_value: Proof.context -> T -> Pretty.T
val name_of_src: src -> string * Position.T
val args_of_src: src -> T list
val checked_src: src -> bool
val check_src: Proof.context -> (Proof.context -> 'a Name_Space.table) -> src -> src * 'a
val pretty_src: Proof.context -> src -> Pretty.T
val ident_or_symbolic: string -> bool
val read_cartouche: Symbol_Pos.T list -> T
val tokenize: Keyword.keywords -> {strict: bool} -> Symbol_Pos.T list -> T list
val explode: Keyword.keywords -> Position.T -> string -> T list
val explode0: Keyword.keywords -> string -> T list
val print_name: Keyword.keywords -> string -> string
val make: (int * int) * string -> Position.T -> T * Position.T
val make_string: string * Position.T -> T
val make_int: int -> T list
val make_src: string * Position.T -> T list -> src
type 'a parser = T list -> 'a * T list
type 'a context_parser = Context.generic * T list -> 'a * (Context.generic * T list)
val read_no_commands: Keyword.keywords -> 'a parser -> Symbol_Pos.T list -> 'a list
val read_antiq: Keyword.keywords -> 'a parser -> Symbol_Pos.T list * Position.T -> 'a
val syntax_generic: 'a context_parser -> src -> Context.generic -> 'a * Context.generic
val syntax: 'a context_parser -> src -> Proof.context -> 'a * Proof.context
end;
structure Token: TOKEN =
struct
(** tokens **)
(* token kind *)
datatype kind =
(*immediate source*)
Command | Keyword | Ident | Long_Ident | Sym_Ident | Var | Type_Ident | Type_Var | Nat |
Float | Space |
(*delimited content*)
String | Alt_String | Verbatim | Cartouche | Comment of Comment.kind option |
(*special content*)
Error of string | EOF;
val str_of_kind =
fn Command => "command"
| Keyword => "keyword"
| Ident => "identifier"
| Long_Ident => "long identifier"
| Sym_Ident => "symbolic identifier"
| Var => "schematic variable"
| Type_Ident => "type variable"
| Type_Var => "schematic type variable"
| Nat => "natural number"
| Float => "floating-point number"
| Space => "white space"
| String => "quoted string"
| Alt_String => "back-quoted string"
| Verbatim => "verbatim text"
| Cartouche => "text cartouche"
| Comment NONE => "informal comment"
| Comment (SOME _) => "formal comment"
| Error _ => "bad input"
| EOF => "end-of-input";
val immediate_kinds =
Vector.fromList
[Command, Keyword, Ident, Long_Ident, Sym_Ident, Var, Type_Ident, Type_Var, Nat, Float, Space];
val delimited_kind =
(fn String => true
| Alt_String => true
| Verbatim => true
| Cartouche => true
| Comment _ => true
| _ => false);
(* datatype token *)
(*The value slot assigns an (optional) internal value to a token,
usually as a side-effect of special scanner setup (see also
args.ML). Note that an assignable ref designates an intermediate
state of internalization -- it is NOT meant to persist.*)
type file = {src_path: Path.T, lines: string list, digest: SHA1.digest, pos: Position.T};
type name_value = {name: string, kind: string, print: Proof.context -> Markup.T * xstring};
datatype T = Token of (Symbol_Pos.text * Position.range) * (kind * string) * slot
and slot =
Slot |
Value of value option |
Assignable of value option Unsynchronized.ref
and value =
Source of T list |
Literal of bool * Markup.T |
Name of name_value * morphism |
Typ of typ |
Term of term |
Fact of string option * thm list | (*optional name for dynamic fact, i.e. fact "variable"*)
Attribute of morphism -> attribute |
Declaration of declaration |
Files of file Exn.result list;
type src = T list;
(* position *)
fun pos_of (Token ((_, (pos, _)), _, _)) = pos;
fun end_pos_of (Token ((_, (_, pos)), _, _)) = pos;
fun range_of (toks as tok :: _) =
let val pos' = end_pos_of (List.last toks)
in Position.range (pos_of tok, pos') end
| range_of [] = Position.no_range;
(* stopper *)
fun mk_eof pos = Token (("", (pos, Position.none)), (EOF, ""), Slot);
val eof = mk_eof Position.none;
fun is_eof (Token (_, (EOF, _), _)) = true
| is_eof _ = false;
val not_eof = not o is_eof;
val stopper =
Scan.stopper (fn [] => eof | toks => mk_eof (end_pos_of (List.last toks))) is_eof;
(* kind of token *)
fun kind_of (Token (_, (k, _), _)) = k;
fun is_kind k (Token (_, (k', _), _)) = k = k';
val is_command = is_kind Command;
fun keyword_with pred (Token (_, (Keyword, x), _)) = pred x
| keyword_with _ _ = false;
val is_command_modifier = keyword_with (fn x => x = "private" orelse x = "qualified");
fun ident_with pred (Token (_, (Ident, x), _)) = pred x
| ident_with _ _ = false;
fun is_proper (Token (_, (Space, _), _)) = false
| is_proper (Token (_, (Comment _, _), _)) = false
| is_proper _ = true;
val is_improper = not o is_proper;
fun is_comment (Token (_, (Comment _, _), _)) = true
| is_comment _ = false;
fun is_informal_comment (Token (_, (Comment NONE, _), _)) = true
| is_informal_comment _ = false;
fun is_formal_comment (Token (_, (Comment (SOME _), _), _)) = true
| is_formal_comment _ = false;
fun is_begin_ignore (Token (_, (Comment NONE, "<"), _)) = true
| is_begin_ignore _ = false;
fun is_end_ignore (Token (_, (Comment NONE, ">"), _)) = true
| is_end_ignore _ = false;
fun is_error (Token (_, (Error _, _), _)) = true
| is_error _ = false;
(* blanks and newlines -- space tokens obey lines *)
fun is_space (Token (_, (Space, _), _)) = true
| is_space _ = false;
fun is_blank (Token (_, (Space, x), _)) = not (String.isSuffix "\n" x)
| is_blank _ = false;
fun is_newline (Token (_, (Space, x), _)) = String.isSuffix "\n" x
| is_newline _ = false;
(* token content *)
fun content_of (Token (_, (_, x), _)) = x;
fun input_of (Token ((source, range), (kind, _), _)) =
Input.source (delimited_kind kind) source range;
fun inner_syntax_of tok =
let val x = content_of tok
in if YXML.detect x then x else Syntax.implode_input (input_of tok) end;
(* markup reports *)
local
val token_kind_markup =
fn Var => (Markup.var, "")
| Type_Ident => (Markup.tfree, "")
| Type_Var => (Markup.tvar, "")
| String => (Markup.string, "")
| Alt_String => (Markup.alt_string, "")
| Verbatim => (Markup.verbatim, "")
| Cartouche => (Markup.cartouche, "")
| Comment _ => (Markup.comment, "")
| Error msg => (Markup.bad (), msg)
| _ => (Markup.empty, "");
fun keyword_reports tok = map (fn markup => ((pos_of tok, markup), ""));
fun command_markups keywords x =
if Keyword.is_theory_end keywords x then [Markup.keyword2 |> Markup.keyword_properties]
else
(if Keyword.is_proof_asm keywords x then [Markup.keyword3]
else if Keyword.is_improper keywords x then [Markup.keyword1, Markup.improper]
else [Markup.keyword1])
|> map Markup.command_properties;
in
fun keyword_markup (important, keyword) x =
if important orelse Symbol.is_ascii_identifier x then keyword else Markup.delimiter;
fun completion_report tok =
if is_kind Keyword tok
then map (fn m => ((pos_of tok, m), "")) (Completion.suppress_abbrevs (content_of tok))
else [];
fun reports keywords tok =
if is_command tok then
keyword_reports tok (command_markups keywords (content_of tok))
else if is_kind Keyword tok then
keyword_reports tok
[keyword_markup (false, Markup.keyword2 |> Markup.keyword_properties) (content_of tok)]
else
let val (m, text) = token_kind_markup (kind_of tok)
in [((pos_of tok, m), text)] end;
fun markups keywords = map (#2 o #1) o reports keywords;
end;
(* unparse *)
fun unparse (Token (_, (kind, x), _)) =
(case kind of
String => Symbol_Pos.quote_string_qq x
| Alt_String => Symbol_Pos.quote_string_bq x
| Verbatim => enclose "{*" "*}" x
| Cartouche => cartouche x
| Comment NONE => enclose "(*" "*)" x
| EOF => ""
| _ => x);
fun print tok = Markup.markups (markups Keyword.empty_keywords tok) (unparse tok);
fun text_of tok =
let
val k = str_of_kind (kind_of tok);
val ms = markups Keyword.empty_keywords tok;
val s = unparse tok;
in
if s = "" then (k, "")
else if size s < 40 andalso not (exists_string (fn c => c = "\n") s)
then (k ^ " " ^ Markup.markups ms s, "")
else (k, Markup.markups ms s)
end;
(** associated values **)
(* inlined file content *)
fun get_files (Token (_, _, Value (SOME (Files files)))) = files
| get_files _ = [];
fun put_files [] tok = tok
| put_files files (Token (x, y, Slot)) = Token (x, y, Value (SOME (Files files)))
| put_files _ tok = raise Fail ("Cannot put inlined files here" ^ Position.here (pos_of tok));
(* access values *)
fun get_value (Token (_, _, Value v)) = v
| get_value _ = NONE;
fun map_value f (Token (x, y, Value (SOME v))) = Token (x, y, Value (SOME (f v)))
| map_value _ tok = tok;
(* reports of value *)
fun get_assignable_value (Token (_, _, Assignable r)) = ! r
| get_assignable_value (Token (_, _, Value v)) = v
| get_assignable_value _ = NONE;
fun reports_of_value tok =
(case get_assignable_value tok of
SOME (Literal markup) =>
let
val pos = pos_of tok;
val x = content_of tok;
in
if Position.is_reported pos then
map (pair pos) (keyword_markup markup x :: Completion.suppress_abbrevs x)
else []
end
| _ => []);
(* name value *)
fun name_value a = Name (a, Morphism.identity);
fun get_name tok =
(case get_assignable_value tok of
SOME (Name (a, _)) => SOME a
| _ => NONE);
(* maxidx *)
fun declare_maxidx tok =
(case get_value tok of
SOME (Source src) => fold declare_maxidx src
| SOME (Typ T) => Variable.declare_maxidx (Term.maxidx_of_typ T)
| SOME (Term t) => Variable.declare_maxidx (Term.maxidx_of_term t)
| SOME (Fact (_, ths)) => fold (Variable.declare_maxidx o Thm.maxidx_of) ths
| SOME (Attribute _) => I (* FIXME !? *)
| SOME (Declaration decl) =>
(fn ctxt =>
let val ctxt' = Context.proof_map (Morphism.form decl) ctxt
in Variable.declare_maxidx (Variable.maxidx_of ctxt') ctxt end)
| _ => I);
(* fact values *)
fun map_facts f =
map_value (fn v =>
(case v of
Source src => Source (map (map_facts f) src)
| Fact (a, ths) => Fact (a, f a ths)
| _ => v));
(* transform *)
fun transform phi =
map_value (fn v =>
(case v of
Source src => Source (map (transform phi) src)
| Literal _ => v
| Name (a, psi) => Name (a, psi $> phi)
| Typ T => Typ (Morphism.typ phi T)
| Term t => Term (Morphism.term phi t)
| Fact (a, ths) => Fact (a, Morphism.fact phi ths)
| Attribute att => Attribute (Morphism.transform phi att)
| Declaration decl => Declaration (Morphism.transform phi decl)
| Files _ => v));
(* static binding *)
(*1st stage: initialize assignable slots*)
fun init_assignable tok =
(case tok of
Token (x, y, Slot) => Token (x, y, Assignable (Unsynchronized.ref NONE))
| Token (_, _, Value _) => tok
| Token (_, _, Assignable r) => (r := NONE; tok));
(*2nd stage: assign values as side-effect of scanning*)
fun assign v tok =
(case tok of
Token (x, y, Slot) => Token (x, y, Value v)
| Token (_, _, Value _) => tok
| Token (_, _, Assignable r) => (r := v; tok));
fun evaluate mk eval arg =
let val x = eval arg in (assign (SOME (mk x)) arg; x) end;
(*3rd stage: static closure of final values*)
fun closure (Token (x, y, Assignable (Unsynchronized.ref v))) = Token (x, y, Value v)
| closure tok = tok;
(* pretty *)
fun pretty_value ctxt tok =
(case get_value tok of
SOME (Literal markup) =>
let val x = content_of tok
in Pretty.mark_str (keyword_markup markup x, x) end
| SOME (Name ({print, ...}, _)) => Pretty.quote (Pretty.mark_str (print ctxt))
| SOME (Typ T) => Syntax.pretty_typ ctxt T
| SOME (Term t) => Syntax.pretty_term ctxt t
| SOME (Fact (_, ths)) =>
Pretty.enclose "(" ")" (Pretty.breaks (map (Pretty.cartouche o Thm.pretty_thm ctxt) ths))
| _ => Pretty.marks_str (markups Keyword.empty_keywords tok, unparse tok));
(* src *)
fun dest_src ([]: src) = raise Fail "Empty token source"
| dest_src (head :: args) = (head, args);
fun name_of_src src =
let
val head = #1 (dest_src src);
val name =
(case get_name head of
SOME {name, ...} => name
| NONE => content_of head);
in (name, pos_of head) end;
val args_of_src = #2 o dest_src;
fun pretty_src ctxt src =
let
val (head, args) = dest_src src;
val prt_name =
(case get_name head of
SOME {print, ...} => Pretty.mark_str (print ctxt)
| NONE => Pretty.str (content_of head));
in Pretty.block (Pretty.breaks (Pretty.quote prt_name :: map (pretty_value ctxt) args)) end;
fun checked_src (head :: _) = is_some (get_name head)
| checked_src [] = true;
fun check_src ctxt get_table src =
let
val (head, args) = dest_src src;
val table = get_table ctxt;
in
(case get_name head of
SOME {name, ...} => (src, Name_Space.get table name)
| NONE =>
let
val pos = pos_of head;
val (name, x) = Name_Space.check (Context.Proof ctxt) table (content_of head, pos);
val _ = Context_Position.report ctxt pos Markup.operator;
val kind = Name_Space.kind_of (Name_Space.space_of_table table);
fun print ctxt' =
Name_Space.markup_extern ctxt' (Name_Space.space_of_table (get_table ctxt')) name;
val value = name_value {name = name, kind = kind, print = print};
val head' = closure (assign (SOME value) head);
in (head' :: args, x) end)
end;
(** scanners **)
open Basic_Symbol_Pos;
val err_prefix = "Outer lexical error: ";
fun !!! msg = Symbol_Pos.!!! (fn () => err_prefix ^ msg);
(* scan symbolic idents *)
val scan_symid =
Scan.many1 (Symbol.is_symbolic_char o Symbol_Pos.symbol) ||
Scan.one (Symbol.is_symbolic o Symbol_Pos.symbol) >> single;
fun is_symid str =
(case try Symbol.explode str of
SOME [s] => Symbol.is_symbolic s orelse Symbol.is_symbolic_char s
| SOME ss => forall Symbol.is_symbolic_char ss
| _ => false);
fun ident_or_symbolic "begin" = false
| ident_or_symbolic ":" = true
| ident_or_symbolic "::" = true
| ident_or_symbolic s = Symbol_Pos.is_identifier s orelse is_symid s;
(* scan verbatim text *)
val scan_verb =
$$$ "*" --| Scan.ahead (~$$ "}") ||
Scan.one (fn (s, _) => s <> "*" andalso Symbol.not_eof s) >> single;
val scan_verbatim =
Scan.ahead ($$ "{" -- $$ "*") |--
!!! "unclosed verbatim text"
((Symbol_Pos.scan_pos --| $$ "{" --| $$ "*") --
(Scan.repeats scan_verb -- ($$ "*" |-- $$ "}" |-- Symbol_Pos.scan_pos)));
val recover_verbatim =
$$$ "{" @@@ $$$ "*" @@@ Scan.repeats scan_verb;
(* scan cartouche *)
val scan_cartouche =
Symbol_Pos.scan_pos --
((Symbol_Pos.scan_cartouche err_prefix >> Symbol_Pos.cartouche_content) -- Symbol_Pos.scan_pos);
(* scan space *)
fun space_symbol (s, _) = Symbol.is_blank s andalso s <> "\n";
val scan_space =
Scan.many1 space_symbol @@@ Scan.optional ($$$ "\n") [] ||
Scan.many space_symbol @@@ $$$ "\n";
(* scan comment *)
val scan_comment =
Symbol_Pos.scan_pos -- (Symbol_Pos.scan_comment_body err_prefix -- Symbol_Pos.scan_pos);
(** token sources **)
local
fun token_leq ((_, syms1), (_, syms2)) = length syms1 <= length syms2;
fun token k ss =
Token ((Symbol_Pos.implode ss, Symbol_Pos.range ss), (k, Symbol_Pos.content ss), Slot);
fun token_range k (pos1, (ss, pos2)) =
Token (Symbol_Pos.implode_range (pos1, pos2) ss, (k, Symbol_Pos.content ss), Slot);
fun scan_token keywords = !!! "bad input"
(Symbol_Pos.scan_string_qq err_prefix >> token_range String ||
Symbol_Pos.scan_string_bq err_prefix >> token_range Alt_String ||
scan_verbatim >> token_range Verbatim ||
scan_cartouche >> token_range Cartouche ||
scan_comment >> token_range (Comment NONE) ||
Comment.scan >> (fn (k, ss) => token (Comment (SOME k)) ss) ||
scan_space >> token Space ||
(Scan.max token_leq
(Scan.max token_leq
(Scan.literal (Keyword.major_keywords keywords) >> pair Command)
(Scan.literal (Keyword.minor_keywords keywords) >> pair Keyword))
(Lexicon.scan_longid >> pair Long_Ident ||
Lexicon.scan_id >> pair Ident ||
Lexicon.scan_var >> pair Var ||
Lexicon.scan_tid >> pair Type_Ident ||
Lexicon.scan_tvar >> pair Type_Var ||
Symbol_Pos.scan_float >> pair Float ||
Symbol_Pos.scan_nat >> pair Nat ||
scan_symid >> pair Sym_Ident) >> uncurry token));
fun recover msg =
(Symbol_Pos.recover_string_qq ||
Symbol_Pos.recover_string_bq ||
recover_verbatim ||
Symbol_Pos.recover_cartouche ||
Symbol_Pos.recover_comment ||
Scan.one (Symbol.not_eof o Symbol_Pos.symbol) >> single)
>> (single o token (Error msg));
in
fun make_source keywords {strict} =
let
val scan_strict = Scan.bulk (scan_token keywords);
val scan = if strict then scan_strict else Scan.recover scan_strict recover;
in Source.source Symbol_Pos.stopper scan end;
fun read_cartouche syms =
(case Scan.read Symbol_Pos.stopper (scan_cartouche >> token_range Cartouche) syms of
SOME tok => tok
| NONE => error ("Single cartouche expected" ^ Position.here (#1 (Symbol_Pos.range syms))));
end;
(* explode *)
fun tokenize keywords strict syms =
Source.of_list syms |> make_source keywords strict |> Source.exhaust;
fun explode keywords pos text =
Symbol_Pos.explode (text, pos) |> tokenize keywords {strict = false};
fun explode0 keywords = explode keywords Position.none;
(* print name in parsable form *)
fun print_name keywords name =
((case explode keywords Position.none name of
[tok] => not (member (op =) [Ident, Long_Ident, Sym_Ident, Nat] (kind_of tok))
| _ => true) ? Symbol_Pos.quote_string_qq) name;
(* make *)
fun make ((k, n), s) pos =
let
val pos' = Position.advance_offset n pos;
val range = Position.range (pos, pos');
val tok =
if 0 <= k andalso k < Vector.length immediate_kinds then
Token ((s, range), (Vector.sub (immediate_kinds, k), s), Slot)
else
(case explode Keyword.empty_keywords pos s of
[tok] => tok
| _ => Token ((s, range), (Error (err_prefix ^ "exactly one token expected"), s), Slot))
in (tok, pos') end;
fun make_string (s, pos) =
let
val Token ((x, _), y, z) = #1 (make ((~1, 0), Symbol_Pos.quote_string_qq s) Position.none);
val pos' = Position.no_range_position pos;
in Token ((x, (pos', pos')), y, z) end;
val make_int = explode Keyword.empty_keywords Position.none o signed_string_of_int;
fun make_src a args = make_string a :: args;
(** parsers **)
type 'a parser = T list -> 'a * T list;
type 'a context_parser = Context.generic * T list -> 'a * (Context.generic * T list);
(* read antiquotation source *)
fun read_no_commands keywords scan syms =
Source.of_list syms
|> make_source (Keyword.no_command_keywords keywords) {strict = true}
|> Source.filter is_proper
|> Source.source stopper (Scan.error (Scan.bulk scan))
|> Source.exhaust;
fun read_antiq keywords scan (syms, pos) =
let
fun err msg =
cat_error msg ("Malformed antiquotation" ^ Position.here pos ^ ":\n" ^
"@{" ^ Symbol_Pos.content syms ^ "}");
val res = read_no_commands keywords scan syms handle ERROR msg => err msg;
in (case res of [x] => x | _ => err "") end;
(* wrapped syntax *)
fun syntax_generic scan src context =
let
val (name, pos) = name_of_src src;
val old_reports = maps reports_of_value src;
val args1 = map init_assignable (args_of_src src);
fun reported_text () =
if Context_Position.is_visible_generic context then
let val new_reports = maps (reports_of_value o closure) args1 in
if old_reports <> new_reports then
map (fn (p, m) => Position.reported_text p m "") new_reports
else []
end
else [];
in
(case Scan.error (Scan.finite' stopper (Scan.option scan)) (context, args1) of
(SOME x, (context', [])) =>
let val _ = Output.report (reported_text ())
in (x, context') end
| (_, (context', args2)) =>
let
val print_name =
(case get_name (hd src) of
NONE => quote name
| SOME {kind, print, ...} =>
let
val ctxt' = Context.proof_of context';
val (markup, xname) = print ctxt';
in plain_words kind ^ " " ^ quote (Markup.markup markup xname) end);
val print_args =
if null args2 then "" else ":\n " ^ space_implode " " (map print args2);
in
error ("Bad arguments for " ^ print_name ^ Position.here pos ^ print_args ^
Markup.markup_report (implode (reported_text ())))
end)
end;
fun syntax scan src = apsnd Context.the_proof o syntax_generic scan src o Context.Proof;
end;
type 'a parser = 'a Token.parser;
type 'a context_parser = 'a Token.context_parser;