(*  Title:      Pure/General/markup.ML

    ID:         $Id$

    Author:     Makarius

Common markup elements.

*)

signature MARKUP =

sig

  type property = string * string

  type T = string * property list

  val get_string: T -> string -> string option

  val get_int: T -> string -> int option

  val none: T

  val properties: (string * string) list -> T -> T

  val nameN: string

  val kindN: string

  val internalK: string

  val property_internal: property

  val lineN: string

  val fileN: string

  val positionN: string val position: T

  val indentN: string

  val blockN: string val block: int -> T

  val widthN: string

  val breakN: string val break: int -> T

  val fbreakN: string val fbreak: T

  val classN: string val class: string -> T

  val tyconN: string val tycon: string -> T

  val constN: string val const: string -> T

  val axiomN: string val axiom: string -> T

  val tfreeN: string val tfree: T

  val tvarN: string val tvar: T

  val freeN: string val free: T

  val skolemN: string val skolem: T

  val boundN: string val bound: T

  val varN: string val var: T

  val numN: string val num: T

  val xnumN: string val xnum: T

  val xstrN: string val xstr: T

  val sortN: string val sort: T

  val typN: string val typ: T

  val termN: string val term: T

  val keywordN: string val keyword: string -> T

  val commandN: string val command: string -> T

  val keyword_declN: string val keyword_decl: string -> T

  val command_declN: string val command_decl: string -> string -> T

  val stringN: string val string: T

  val altstringN: string val altstring: T

  val verbatimN: string val verbatim: T

  val commentN: string val comment: T

  val controlN: string val control: T

  val malformedN: string val malformed: T

  val antiqN: string val antiq: T

  val whitespaceN: string val whitespace: T

  val junkN: string val junk: T

  val commandspanN: string val commandspan: string -> T

  val promptN: string val prompt: T

  val stateN: string val state: T

  val subgoalN: string val subgoal: T

  val sendbackN: string val sendback: T

  val hiliteN: string val hilite: T

  val default_output: T -> output * output

  val add_mode: string -> (T -> output * output) -> unit

  val output: T -> output * output

  val enclose: T -> output -> output

end;

structure Markup: MARKUP =

struct

(* basic markup *)

type property = string * string;

type T = string * property list;

val none = ("", []);

fun properties more_props ((elem, props): T) =

  (elem, fold_rev (AList.update (op =)) more_props props);

fun get_string ((_, props): T) prop = AList.lookup (op =) props prop;

fun get_int m prop = (case get_string m prop of NONE => NONE | SOME s => Int.fromString s);

fun markup elem = (elem, (elem, []): T);

fun markup_string elem prop = (elem, fn s => (elem, [(prop, s)]): T);

fun markup_int elem prop = (elem, fn i => (elem, [(prop, Int.toString i)]): T);

val nameN = "name";

(* kind *)

val kindN = "kind";

val internalK = "internal";

val property_internal = (kindN, internalK);

(* position *)

val lineN = "line";

val fileN = "file";

val (positionN, position) = markup "position";

(* pretty printing *)

val indentN = "indent";

val (blockN, block) = markup_int "block" indentN;

val widthN = "width";

val (breakN, break) = markup_int "break" widthN;

val (fbreakN, fbreak) = markup "fbreak";

(* logical entities *)

val (classN, class) = markup_string "class" nameN;

val (tyconN, tycon) = markup_string "tycon" nameN;

val (constN, const) = markup_string "const" nameN;

val (axiomN, axiom) = markup_string "axiom" nameN;

(* inner syntax *)

val (tfreeN, tfree) = markup "tfree";

val (tvarN, tvar) = markup "tvar";

val (freeN, free) = markup "free";

val (skolemN, skolem) = markup "skolem";

val (boundN, bound) = markup "bound";

val (varN, var) = markup "var";

val (numN, num) = markup "num";

val (xnumN, xnum) = markup "xnum";

val (xstrN, xstr) = markup "xstr";

val (sortN, sort) = markup "sort";

val (typN, typ) = markup "typ";

val (termN, term) = markup "term";

(* outer syntax *)

val (keywordN, keyword) = markup_string "keyword" nameN;

val (commandN, command) = markup_string "command" nameN;

val (keyword_declN, keyword_decl) = markup_string "keyword_decl" nameN;

val command_declN = "command_decl";

fun command_decl name kind : T = (command_declN, [(nameN, name), (kindN, kind)]);

val (stringN, string) = markup "string";

val (altstringN, altstring) = markup "altstring";

val (verbatimN, verbatim) = markup "verbatim";

val (commentN, comment) = markup "comment";

val (controlN, control) = markup "control";

val (malformedN, malformed) = markup "malformed";

val (antiqN, antiq) = markup "antiq";

val (whitespaceN, whitespace) = markup "whitespace";

val (junkN, junk) = markup "junk";

val (commandspanN, commandspan) = markup_string "commandspan" nameN;

(* toplevel *)

val (promptN, prompt) = markup "prompt";

val (stateN, state) = markup "state";

val (subgoalN, subgoal) = markup "subgoal";

val (sendbackN, sendback) = markup "sendback";

val (hiliteN, hilite) = markup "hilite";

(* print mode operations *)

fun default_output (_: T) = ("", "");

local

  val default = {output = default_output};

  val modes = ref (Symtab.make [("", default)]);

in

  fun add_mode name output = CRITICAL (fn () =>

    change modes (Symtab.update_new (name, {output = output})));

  fun get_mode () =

    the_default default (Library.get_first (Symtab.lookup (! modes)) (print_mode_value ()));

end;

fun output ("", _) = ("", "")

  | output m = #output (get_mode ()) m;

val enclose = output #-> Library.enclose;

end;