(*  Title:      Pure/Isar/outer_syntax.ML

    ID:         $Id$

    Author:     Markus Wenzel, TU Muenchen

    License:    GPL (GNU GENERAL PUBLIC LICENSE)

The global Isabelle/Isar outer syntax.

*)

signature BASIC_OUTER_SYNTAX =

sig

  val main: unit -> unit

  val loop: unit -> unit

  val sync_main: unit -> unit

  val sync_loop: unit -> unit

end;

signature OUTER_SYNTAX =

sig

  include BASIC_OUTER_SYNTAX

  structure Keyword:

    sig

      val control: string

      val diag: string

      val thy_begin: string

      val thy_switch: string

      val thy_end: string

      val thy_heading: string

      val thy_decl: string

      val thy_script: string

      val thy_goal: string

      val qed: string

      val qed_block: string

      val qed_global: string

      val prf_heading: string

      val prf_goal: string

      val prf_block: string

      val prf_open: string

      val prf_close: string

      val prf_chain: string

      val prf_decl: string

      val prf_asm: string

      val prf_asm_goal: string

      val prf_script: string

      val kinds: string list

    end

  type token

  type parser

  val command: string -> string -> string ->

    (token list -> (Toplevel.transition -> Toplevel.transition) * token list) -> parser

  val markup_command: IsarOutput.markup -> string -> string -> string ->

    (token list -> (Toplevel.transition -> Toplevel.transition) * token list) -> parser

  val improper_command: string -> string -> string ->

    (token list -> (Toplevel.transition -> Toplevel.transition) * token list) -> parser

  val is_keyword: string -> bool

  val dest_keywords: unit -> string list

  val dest_parsers: unit -> (string * string * string * bool) list

  val print_outer_syntax: unit -> unit

  val print_commands: Toplevel.transition -> Toplevel.transition

  val add_keywords: string list -> unit

  val add_parsers: parser list -> unit

  val check_text: string * Position.T -> bool -> Toplevel.state -> unit

  val deps_thy: string -> bool -> Path.T -> string list * Path.T list

  val load_thy: string -> bool -> bool -> Path.T -> unit

  val isar: bool -> bool -> unit Toplevel.isar

  val isar_readstring: Position.T -> string -> (string list) Toplevel.isar

end;

structure OuterSyntax: OUTER_SYNTAX =

struct

structure T = OuterLex;

structure P = OuterParse;

(** outer syntax **)

(* command keyword classification *)

structure Keyword =

struct

  val control = "control";

  val diag = "diag";

  val thy_begin = "theory-begin";

  val thy_switch = "theory-switch";

  val thy_end = "theory-end";

  val thy_heading = "theory-heading";

  val thy_decl = "theory-decl";

  val thy_script = "theory-script";

  val thy_goal = "theory-goal";

  val qed = "qed";

  val qed_block = "qed-block";

  val qed_global = "qed-global";

  val prf_heading = "proof-heading";

  val prf_goal = "proof-goal";

  val prf_block = "proof-block";

  val prf_open = "proof-open";

  val prf_close = "proof-close";

  val prf_chain = "proof-chain";

  val prf_decl = "proof-decl";

  val prf_asm = "proof-asm";

  val prf_asm_goal = "proof-asm-goal";

  val prf_script = "proof-script";

  val kinds = [control, diag, thy_begin, thy_switch, thy_end, thy_heading, thy_decl, thy_script,

    thy_goal, qed, qed_block, qed_global, prf_heading, prf_goal, prf_block, prf_open, prf_close,

    prf_chain, prf_decl, prf_asm, prf_asm_goal, prf_script];

end;

(* parsers *)

type token = T.token;

type parser_fn = token list -> (Toplevel.transition -> Toplevel.transition) * token list;

datatype parser =

  Parser of string * (string * string * IsarOutput.markup option) * bool * parser_fn;

fun parser int_only markup name comment kind parse =

  Parser (name, (comment, kind, markup), int_only, parse);

(* parse command *)

local

fun command_body cmd (name, _) =

  (case cmd name of

    Some (int_only, parse) => P.!!! (Scan.prompt (name ^ "# ") (parse >> pair int_only))

  | None => sys_error ("no parser for outer syntax command " ^ quote name));

fun terminator false = Scan.succeed ()

  | terminator true = P.group "end of input" (Scan.option P.sync -- P.semicolon >> K ());

in

fun command term cmd =

  P.semicolon >> K None ||

  P.sync >> K None ||

  (P.position P.command :-- command_body cmd) --| terminator term

    >> (fn ((name, pos), (int_only, f)) =>

      Some (Toplevel.empty |> Toplevel.name name |> Toplevel.position pos |>

        Toplevel.interactive int_only |> f));

end;

(** global outer syntax **)

local

val global_lexicons = ref (Scan.empty_lexicon, Scan.empty_lexicon);

val global_parsers =

  ref (Symtab.empty: (((string * string) * (bool * parser_fn)) * IsarOutput.markup option)

    Symtab.table);

val global_markups = ref ([]: (string * IsarOutput.markup) list);

fun change_lexicons f =

  let val lexs = f (! global_lexicons) in

    (case (op inter_string) (pairself Scan.dest_lexicon lexs) of

      [] => global_lexicons := lexs

    | bads => error ("Clash of outer syntax commands and keywords: " ^ commas_quote bads))

  end;

fun get_markup (ms, (name, (_, Some m))) = (name, m) :: ms

  | get_markup (ms, _) = ms;

fun make_markups () = global_markups := Symtab.foldl get_markup ([], ! global_parsers);

fun change_parsers f = (Library.change global_parsers f; make_markups ());

in

(* access current syntax *)

(*Note: the syntax for files is statically determined at the very

  beginning; for interactive processing it may change dynamically.*)

fun get_lexicons () = ! global_lexicons;

fun get_parsers () = ! global_parsers;

fun get_parser () = apsome (#2 o #1) o curry Symtab.lookup (! global_parsers);

fun is_markup kind name =

  (case assoc (! global_markups, name) of Some k => k = kind | None => false);

fun markup kind = Scan.one (T.is_kind T.Command andf is_markup kind o T.val_of);

(* augment syntax *)

fun add_keywords keywords = change_lexicons (apfst (fn lex =>

  (Scan.extend_lexicon lex (map Symbol.explode keywords))));

fun add_parser (tab, Parser (name, (comment, kind, markup), int_only, parse)) =

 (if is_none (Symtab.lookup (tab, name)) then ()

  else warning ("Redefined outer syntax command " ^ quote name);

  Symtab.update ((name, (((comment, kind), (int_only, parse)), markup)), tab));

fun add_parsers parsers =

  (change_parsers (fn tab => foldl add_parser (tab, parsers));

    change_lexicons (apsnd (fn lex => Scan.extend_lexicon lex

      (map (fn Parser (name, _, _, _) => Symbol.explode name) parsers))));

end;

(* print syntax *)

fun is_keyword s = Scan.is_literal (#1 (get_lexicons ())) (Symbol.explode s);

fun dest_keywords () = Scan.dest_lexicon (#1 (get_lexicons ()));

fun dest_parsers () =

  map (fn (name, (((cmt, kind), (int_only, _)), _)) => (name, cmt, kind, int_only))

    (Symtab.dest (get_parsers ()));

fun print_outer_syntax () =

  let

    fun pretty_cmd (name, comment, _, _) =

      Pretty.block [Pretty.str (name ^ ":"), Pretty.brk 2, Pretty.str comment];

    val (int_cmds, cmds) = partition #4 (dest_parsers ());

  in

    [Pretty.strs ("syntax keywords:" :: map quote (dest_keywords ())),

      Pretty.big_list "proper commands:" (map pretty_cmd cmds),

      Pretty.big_list "improper commands (interactive-only):" (map pretty_cmd int_cmds)]

    |> Pretty.chunks |> Pretty.writeln

  end;

val print_commands = Toplevel.imperative print_outer_syntax;

(** toplevel parsing **)

(* basic sources *)

fun toplevel_source term do_recover cmd src =

  let

    val no_terminator =

      Scan.unless P.semicolon (Scan.one (T.not_sync andf T.not_eof));

    fun recover x = (Scan.prompt "recover# " (Scan.repeat no_terminator) >> K [None]) x;

  in

    src

    |> T.source_proper

    |> Source.source T.stopper

      (Scan.bulk (P.$$$ "--" -- P.!!! P.text >> K None || P.not_eof >> Some))

      (if do_recover then Some recover else None)

    |> Source.mapfilter I

    |> Source.source T.stopper (Scan.bulk (fn xs => P.!!! (command term (cmd ())) xs))

      (if do_recover then Some recover else None)

    |> Source.mapfilter I

  end;

(* interactive source of toplevel transformers *)

fun isar term no_pos =

  Source.tty

  |> Symbol.source true

  |> T.source true get_lexicons

    (if no_pos then Position.none else Position.line_name 1 "stdin")

  |> toplevel_source term true get_parser;

(* string source of transformers (for Proof General) *)

fun isar_readstring pos str =

  Source.of_string str

  |> Symbol.source false

  |> T.source false get_lexicons pos

  |> toplevel_source false true get_parser;

(** read theory **)

(* check_text *)

fun check_text s true state = (IsarOutput.eval_antiquote (#1 (get_lexicons ())) state s; ())

  | check_text _ false _ = ();

(* deps_thy *)

fun deps_thy name ml path =

  let

    val src = Source.of_string (File.read path);

    val pos = Path.position path;

    val (name', parents, files) = ThyHeader.scan (src, pos);

    val ml_path = ThyLoad.ml_path name;

    val ml_file = if ml andalso is_some (ThyLoad.check_file ml_path) then [ml_path] else [];

  in

    if name <> name' then

      error ("Filename " ^ quote (Path.pack path) ^

        " does not agree with theory name " ^ quote name')

    else (parents, map (Path.unpack o #1) files @ ml_file)

  end;

(* load_thy *)

local

fun try_ml_file name time =

  let

    val path = ThyLoad.ml_path name;

    val tr = Toplevel.imperative (fn () => ThyInfo.load_file time path);

    val tr_name = if time then "time_use" else "use";

  in

    if is_none (ThyLoad.check_file path) then ()

    else Toplevel.excursion [Toplevel.empty |> Toplevel.name tr_name |> tr]

  end;

fun parse_thy src =

  src

  |> toplevel_source false false (K (get_parser ()))

  |> Source.exhaust;

fun run_thy name path =

  let

    val pos = Path.position path;

    val text = Library.untabify (explode (File.read path));

    val text_src = Source.of_list text;

    fun present_text () = Source.exhaust (Symbol.source false text_src);

  in

    Present.init_theory name;

    Present.verbatim_source name present_text;

    if ThyHeader.is_old (text_src, pos) then (ThySyn.load_thy name text;

      Present.old_symbol_source name present_text)   (*note: text presented twice*)

    else

      let

        val tok_src = text_src

          |> Symbol.source false

          |> T.source false (K (get_lexicons ())) pos

          |> Source.exhausted;

        val out = Toplevel.excursion_result

          (IsarOutput.parse_thy markup (#1 (get_lexicons ()))

            (parse_thy tok_src) tok_src);

      in Present.theory_output name (Buffer.content out) end

  end;

in

fun load_thy name ml time path =

 (if time then

    timeit (fn () =>

     (writeln ("\n**** Starting theory " ^ quote name ^ " ****");

      run_thy name path;

      writeln ("**** Finished theory " ^ quote name ^ " ****\n")))

  else run_thy name path;

  Context.context (ThyInfo.get_theory name);

  if ml then try_ml_file name time else ());

end;

(** the read-eval-print loop **)

(* main loop *)

fun gen_loop term no_pos =

 (Context.reset_context ();

  Toplevel.loop (isar term no_pos));

fun gen_main term no_pos =

 (Toplevel.set_state Toplevel.toplevel;

  writeln (Session.welcome ());

  gen_loop term no_pos);

fun main () = gen_main false false;

fun loop () = gen_loop false false;

fun sync_main () = gen_main true true;

fun sync_loop () = gen_loop true true;

(* help *)

fun help () =

  writeln ("This is Isabelle's underlying ML system (" ^ ml_system ^ ");\n\

    \invoke 'Isar.loop();' to get back to the Isar read-eval-print loop.");

(*final declarations of this structure!*)

val command = parser false None;

val markup_command = parser false o Some;

val improper_command = parser true None;

end;

(*setup theory syntax dependent operations*)

ThyLoad.deps_thy_fn := OuterSyntax.deps_thy;

ThyLoad.load_thy_fn := OuterSyntax.load_thy;

structure ThyLoad: THY_LOAD = ThyLoad;

structure BasicOuterSyntax: BASIC_OUTER_SYNTAX = OuterSyntax;

open BasicOuterSyntax;