src/Pure/Thy/latex.ML
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(*  Title:      Pure/Thy/latex.ML
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    Author:     Markus Wenzel, TU Muenchen
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LaTeX presentation elements -- based on outer lexical syntax.
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*)
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signature LATEX =
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sig
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  type text
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  val string: string -> text
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  val text: string * Position.T -> text
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  val block: text list -> text
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  val enclose_body: string -> string -> text list -> text list
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  val output_text: text list -> string
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  val output_positions: Position.T -> text list -> string
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  val output_name: string -> string
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  val output_ascii: string -> string
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  val latex_control: Symbol.symbol
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  val is_latex_control: Symbol.symbol -> bool
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  val embed_raw: string -> string
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  val output_symbols: Symbol.symbol list -> string
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  val output_symbols_pos: Symbol_Pos.T list -> string
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  val output_syms: string -> string
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  val begin_delim: string -> string
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  val end_delim: string -> string
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  val begin_tag: string -> string
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  val end_tag: string -> string
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  val environment_block: string -> text list -> text
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  val environment: string -> string -> string
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  val isabelle_body: string -> text list -> text list
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  val theory_entry: string -> string
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  val latexN: string
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end;
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structure Latex: LATEX =
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struct
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(* text with positions *)
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abstype text = Text of string * Position.T | Block of text list
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with
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fun string s = Text (s, Position.none);
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val text = Text;
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val block = Block;
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fun output_text texts =
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  let
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    fun output (Text (s, _)) = Buffer.add s
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      | output (Block body) = fold output body;
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  in Buffer.empty |> fold output texts |> Buffer.content end;
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fun output_positions file_pos texts =
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  let
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    fun position (a, b) = enclose "%:%" "%:%" (a ^ "=" ^ b);
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    fun add_position p positions =
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      let val s = position (apply2 Value.print_int p)
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      in positions |> s <> hd positions ? cons s end;
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    fun output (Text (s, pos)) (positions, line) =
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          let
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            val positions' =
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              (case Position.line_of pos of
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                NONE => positions
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              | SOME l => add_position (line, l) positions);
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            val line' = fold_string (fn c => fn n => if c = "\n" then n + 1 else n) s line;
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          in (positions', line') end
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      | output (Block body) res = fold output body res;
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  in
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    (case Position.file_of file_pos of
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      NONE => ""
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    | SOME file =>
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        ([position (Markup.fileN, file), "\\endinput"], 1)
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        |> fold output texts |> #1 |> rev |> cat_lines)
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  end;
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end;
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fun enclose_body bg en body =
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  (if bg = "" then [] else [string bg]) @ body @
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  (if en = "" then [] else [string en]);
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(* output name for LaTeX macros *)
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val output_name =
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  translate_string
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    (fn "_" => "UNDERSCORE"
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      | "'" => "PRIME"
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      | "0" => "ZERO"
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      | "1" => "ONE"
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      | "2" => "TWO"
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      | "3" => "THREE"
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      | "4" => "FOUR"
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      | "5" => "FIVE"
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      | "6" => "SIX"
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      | "7" => "SEVEN"
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      | "8" => "EIGHT"
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      | "9" => "NINE"
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      | s => s);
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fun enclose_name bg en = enclose bg en o output_name;
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(* output verbatim ASCII *)
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val output_ascii =
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  translate_string
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    (fn " " => "\\ "
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      | "\t" => "\\ "
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      | "\n" => "\\isanewline\n"
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      | s =>
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          if exists_string (fn s' => s = s') "\"#$%&',-<>\\^_`{}~"
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          then enclose "{\\char`\\" "}" s else s);
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(* output symbols *)
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val latex_control = "\<^latex>";
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fun is_latex_control s = s = latex_control;
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val embed_raw = prefix latex_control o cartouche;
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local
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val char_table =
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  Symtab.make
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   [("\007", "{\\isacharbell}"),
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    ("!", "{\\isacharbang}"),
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    ("\"", "{\\isachardoublequote}"),
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    ("#", "{\\isacharhash}"),
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    ("$", "{\\isachardollar}"),
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    ("%", "{\\isacharpercent}"),
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    ("&", "{\\isacharampersand}"),
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    ("'", "{\\isacharprime}"),
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    ("(", "{\\isacharparenleft}"),
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    (")", "{\\isacharparenright}"),
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    ("*", "{\\isacharasterisk}"),
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    ("+", "{\\isacharplus}"),
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    (",", "{\\isacharcomma}"),
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    ("-", "{\\isacharminus}"),
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    (".", "{\\isachardot}"),
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    ("/", "{\\isacharslash}"),
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    (":", "{\\isacharcolon}"),
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    (";", "{\\isacharsemicolon}"),
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    ("<", "{\\isacharless}"),
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    ("=", "{\\isacharequal}"),
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    (">", "{\\isachargreater}"),
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    ("?", "{\\isacharquery}"),
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    ("@", "{\\isacharat}"),
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    ("[", "{\\isacharbrackleft}"),
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    ("\\", "{\\isacharbackslash}"),
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    ("]", "{\\isacharbrackright}"),
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    ("^", "{\\isacharcircum}"),
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    ("_", "{\\isacharunderscore}"),
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    ("`", "{\\isacharbackquote}"),
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    ("{", "{\\isacharbraceleft}"),
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    ("|", "{\\isacharbar}"),
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    ("}", "{\\isacharbraceright}"),
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    ("~", "{\\isachartilde}")];
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fun output_chr " " = "\\ "
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  | output_chr "\t" = "\\ "
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  | output_chr "\n" = "\\isanewline\n"
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  | output_chr c =
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      (case Symtab.lookup char_table c of
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        SOME s => s
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      | NONE => if Symbol.is_ascii_digit c then enclose "{\\isadigit{" "}}" c else c);
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fun output_sym sym =
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  (case Symbol.decode sym of
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    Symbol.Char s => output_chr s
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  | Symbol.UTF8 s => s
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  | Symbol.Sym s => enclose_name "{\\isasym" "}" s
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  | Symbol.Control s => enclose_name "\\isactrl" " " s
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  | Symbol.Malformed s => error (Symbol.malformed_msg s)
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  | Symbol.EOF => error "Bad EOF symbol");
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val scan_latex_length =
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  Scan.many1 (fn (s, _) => Symbol.not_eof s andalso not (is_latex_control s))
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    >> (Symbol.length o map Symbol_Pos.symbol) ||
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  Scan.one (is_latex_control o Symbol_Pos.symbol) --
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    Scan.option (Scan.permissive Symbol_Pos.scan_cartouche "") >> K 0;
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val scan_latex =
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  Scan.one (is_latex_control o Symbol_Pos.symbol) |--
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    Symbol_Pos.scan_cartouche_content "Embedded LaTeX: " >> (implode o map Symbol_Pos.symbol) ||
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  Scan.one (Symbol.not_eof o Symbol_Pos.symbol) >> (output_sym o Symbol_Pos.symbol);
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fun read scan syms =
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  Scan.read Symbol_Pos.stopper (Scan.repeat scan) (map (rpair Position.none) syms);
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in
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fun length_symbols syms =
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  fold Integer.add (these (read scan_latex_length syms)) 0;
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fun output_symbols syms =
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  if exists is_latex_control syms then
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    (case read scan_latex syms of
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      SOME ss => implode ss
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    | NONE => error ("Malformed embedded LaTeX: " ^ quote (Symbol.beginning 10 syms)))
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  else implode (map output_sym syms);
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val output_symbols_pos = output_symbols o map Symbol_Pos.symbol;
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val output_syms = output_symbols o Symbol.explode;
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end;
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(* tags *)
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val begin_delim = enclose_name "%\n\\isadelim" "\n";
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val end_delim = enclose_name "%\n\\endisadelim" "\n";
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val begin_tag = enclose_name "%\n\\isatag" "\n";
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fun end_tag tg = enclose_name "%\n\\endisatag" "\n" tg ^ enclose "{\\isafold" "}%\n" tg;
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36ba0d4a836c flag_markup;
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(* theory presentation *)
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fun environment_delim name =
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 ("%\n\\begin{" ^ output_name name ^ "}%\n",
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  "%\n\\end{" ^ output_name name ^ "}");
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fun environment_block name = environment_delim name |-> enclose_body #> block;
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fun environment name = environment_delim name |-> enclose;
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fun isabelle_body name =
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  enclose_body
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   ("%\n\\begin{isabellebody}%\n\\setisabellecontext{" ^ output_syms name ^ "}%\n")
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   "%\n\\end{isabellebody}%\n";
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fun theory_entry name = "\\input{" ^ name ^ ".tex}\n\n";
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(* print mode *)
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val latexN = "latex";
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fun latex_output str =
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  let val syms = Symbol.explode str
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  in (output_symbols syms, length_symbols syms) end;
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fun latex_markup (s, _) =
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  if s = Markup.commandN orelse s = Markup.keyword1N orelse s = Markup.keyword3N
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  then ("\\isacommand{", "}")
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  else if s = Markup.keyword2N
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  then ("\\isakeyword{", "}")
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  else Markup.no_output;
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fun latex_indent "" _ = ""
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  | latex_indent s _ = enclose "\\isaindent{" "}" s;
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val _ = Output.add_mode latexN latex_output embed_raw;
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val _ = Markup.add_mode latexN latex_markup;
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val _ = Pretty.add_mode latexN latex_indent;
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end;