(*  Title:      Pure/Thy/thy_output.ML

    ID:         $Id$

    Author:     Markus Wenzel, TU Muenchen

Theory document output.

*)

signature THY_OUTPUT =

sig

  val display: bool ref

  val quotes: bool ref

  val indent: int ref

  val source: bool ref

  val add_commands: (string * (Args.src -> Toplevel.node option -> string)) list -> unit

  val add_options: (string * (string -> (unit -> string) -> unit -> string)) list -> unit

  val defined_command: string -> bool

  val defined_option: string -> bool

  val print_antiquotations: unit -> unit

  val boolean: string -> bool

  val integer: string -> int

  val args: (Context.generic * Args.T list -> 'a * (Context.generic * Args.T list)) ->

    (Args.src -> Proof.context -> 'a -> string) -> Args.src -> Toplevel.node option -> string

  datatype markup = Markup | MarkupEnv | Verbatim

  val modes: string list ref

  val eval_antiquote: Scan.lexicon -> Toplevel.node option -> SymbolPos.text * Position.T -> string

  val process_thy: Scan.lexicon -> (string -> string list) -> (markup -> string -> bool) ->

    Toplevel.transition list -> (OuterLex.token, 'a) Source.source -> Buffer.T

  val output_list: (Proof.context -> 'a -> Pretty.T) -> Args.src ->

    Proof.context -> 'a list -> string

  val output: (Proof.context -> 'a -> Pretty.T) -> Args.src -> Proof.context -> 'a -> string

end;

structure ThyOutput: THY_OUTPUT =

struct

structure T = OuterLex;

structure P = OuterParse;

(** global options **)

val locale = ref "";

val display = ref false;

val quotes = ref false;

val indent = ref 0;

val source = ref false;

val break = ref false;

(** maintain global commands **)

local

val global_commands =

  ref (Symtab.empty: (Args.src -> Toplevel.node option -> string) Symtab.table);

val global_options =

  ref (Symtab.empty: (string -> (unit -> string) -> unit -> string) Symtab.table);

fun add_item kind (name, x) tab =

 (if not (Symtab.defined tab name) then ()

  else warning ("Redefined text antiquotation " ^ kind ^ ": " ^ quote name);

  Symtab.update (name, x) tab);

in

fun add_commands xs = CRITICAL (fn () => change global_commands (fold (add_item "command") xs));

fun add_options xs = CRITICAL (fn () => change global_options (fold (add_item "option") xs));

fun defined_command name = Symtab.defined (! global_commands) name;

fun defined_option name = Symtab.defined (! global_options) name;

fun command src =

  let val ((name, _), pos) = Args.dest_src src in

    (case Symtab.lookup (! global_commands) name of

      NONE => error ("Unknown text antiquotation command: " ^ quote name ^ Position.str_of pos)

    | SOME f => f src)

  end;

fun option (name, s) f () =

  (case Symtab.lookup (! global_options) name of

    NONE => error ("Unknown text antiquotation option: " ^ quote name)

  | SOME opt => opt s f ());

fun options [] f = f

  | options (opt :: opts) f = option opt (options opts f);

fun print_antiquotations () =

 [Pretty.big_list "text antiquotation commands:"

    (map Pretty.str (sort_strings (Symtab.keys (! global_commands)))),

  Pretty.big_list "text antiquotation options:"

    (map Pretty.str (sort_strings (Symtab.keys (! global_options))))]

 |> Pretty.chunks |> Pretty.writeln;

end;

(** syntax of antiquotations **)

(* option values *)

fun boolean "" = true

  | boolean "true" = true

  | boolean "false" = false

  | boolean s = error ("Bad boolean value: " ^ quote s);

fun integer s =

  let

    fun int ss =

      (case Library.read_int ss of (i, []) => i

      | _ => error ("Bad integer value: " ^ quote s));

  in (case Symbol.explode s of "-" :: ss => ~ (int ss) | ss => int ss) end;

(* args syntax *)

fun syntax scan = Args.context_syntax "text antiquotation" scan;

fun args scan f src node : string =

  let

    val loc = if ! locale = "" then NONE else SOME (! locale);

    val (x, ctxt) = syntax scan src (Toplevel.presentation_context node loc);

  in f src ctxt x end;

(* outer syntax *)

local

val property = P.xname -- Scan.optional (P.$$$ "=" |-- P.!!! P.xname) "";

val properties = Scan.optional (P.$$$ "[" |-- P.!!! (P.enum "," property --| P.$$$ "]")) [];

in

val antiq = P.!!! (P.position P.xname -- properties -- Args.parse --| Scan.ahead P.eof)

  >> (fn (((x, pos), y), z) => (y, Args.src ((x, z), pos)));

end;

(* eval_antiquote *)

val modes = ref ([]: string list);

fun eval_antiquote lex node (txt, pos) =

  let

    fun expand (Antiquote.Text s) = s

      | expand (Antiquote.Antiq x) =

          let val (opts, src) = Antiquote.read_antiq lex antiq x in

            options opts (fn () => command src node) ();  (*preview errors!*)

            PrintMode.with_modes (! modes @ Latex.modes)

              (Output.no_warnings (options opts (fn () => command src node))) ()

          end

      | expand (Antiquote.Open _) = ""

      | expand (Antiquote.Close _) = "";

    val ants = Antiquote.read (SymbolPos.explode (txt, pos), pos);

  in

    if is_none node andalso exists Antiquote.is_antiq ants then

      error ("Unknown context -- cannot expand text antiquotations" ^ Position.str_of pos)

    else implode (map expand ants)

  end;

(** present theory source **)

(*NB: arranging white space around command spans is a black art.*)

(* presentation tokens *)

datatype token =

    NoToken

  | BasicToken of T.token

  | MarkupToken of string * (string * Position.T)

  | MarkupEnvToken of string * (string * Position.T)

  | VerbatimToken of string * Position.T;

fun output_token lex state =

  let

    val eval = eval_antiquote lex (try Toplevel.node_of state)

  in

    fn NoToken => ""

     | BasicToken tok => Latex.output_basic tok

     | MarkupToken (cmd, txt) => Latex.output_markup cmd (eval txt)

     | MarkupEnvToken (cmd, txt) => Latex.output_markup_env cmd (eval txt)

     | VerbatimToken txt => Latex.output_verbatim (eval txt)

  end;

fun basic_token pred (BasicToken tok) = pred tok

  | basic_token _ _ = false;

val improper_token = basic_token (not o T.is_proper);

val comment_token = basic_token T.is_comment;

val blank_token = basic_token T.is_blank;

val newline_token = basic_token T.is_newline;

(* command spans *)

type command = string * Position.T * string list;   (*name, position, tags*)

type source = (token * (string * int)) list;        (*token, markup flag, meta-comment depth*)

datatype span = Span of command * (source * source * source * source) * bool;

fun make_span cmd src =

  let

    fun take_newline (tok :: toks) =

          if newline_token (fst tok) then ([tok], toks, true)

          else ([], tok :: toks, false)

      | take_newline [] = ([], [], false);

    val (((src_prefix, src_main), src_suffix1), (src_suffix2, src_appendix, newline)) =

      src

      |> take_prefix (improper_token o fst)

      ||>> take_suffix (improper_token o fst)

      ||>> take_prefix (comment_token o fst)

      ||> take_newline;

  in Span (cmd, (src_prefix, src_main, src_suffix1 @ src_suffix2, src_appendix), newline) end;

(* present spans *)

local

fun err_bad_nesting pos =

  error ("Bad nesting of commands in presentation" ^ pos);

fun edge which f (x: string option, y) =

  if x = y then I

  else (case which (x, y) of NONE => I | SOME txt => Buffer.add (f txt));

val begin_tag = edge #2 Latex.begin_tag;

val end_tag = edge #1 Latex.end_tag;

fun open_delim delim e = edge #2 Latex.begin_delim e #> delim #> edge #2 Latex.end_delim e;

fun close_delim delim e = edge #1 Latex.begin_delim e #> delim #> edge #1 Latex.end_delim e;

in

fun present_span lex default_tags span state state'

    (tag_stack, active_tag, newline, buffer, present_cont) =

  let

    val present = fold (fn (tok, (flag, 0)) =>

        Buffer.add (output_token lex state' tok)

        #> Buffer.add flag

      | _ => I);

    val Span ((cmd_name, cmd_pos, cmd_tags), srcs, span_newline) = span;

    val (tag, tags) = tag_stack;

    val tag' = try hd (fold OuterKeyword.update_tags cmd_tags (the_list tag));

    val active_tag' =

      if is_some tag' then tag'

      else if cmd_name = "end" andalso not (Toplevel.is_toplevel state') then NONE

      else try hd (default_tags cmd_name);

    val edge = (active_tag, active_tag');

    val newline' =

      if is_none active_tag' then span_newline else newline;

    val nesting = Toplevel.level state' - Toplevel.level state;

    val tag_stack' =

      if nesting = 0 andalso not (Toplevel.is_proof state) then tag_stack

      else if nesting >= 0 then (tag', replicate nesting tag @ tags)

      else

        (case Library.drop (~ nesting - 1, tags) of

          tgs :: tgss => (tgs, tgss)

        | [] => err_bad_nesting (Position.str_of cmd_pos));

    val buffer' =

      buffer

      |> end_tag edge

      |> close_delim (fst present_cont) edge

      |> snd present_cont

      |> open_delim (present (#1 srcs)) edge

      |> begin_tag edge

      |> present (#2 srcs);

    val present_cont' =

      if newline then (present (#3 srcs), present (#4 srcs))

      else (I, present (#3 srcs) #> present (#4 srcs));

  in (tag_stack', active_tag', newline', buffer', present_cont') end;

fun present_trailer ((_, tags), active_tag, _, buffer, present_cont) =

  if not (null tags) then err_bad_nesting " at end of theory"

  else

    buffer

    |> end_tag (active_tag, NONE)

    |> close_delim (fst present_cont) (active_tag, NONE)

    |> snd present_cont;

end;

(* process_thy *)

datatype markup = Markup | MarkupEnv | Verbatim;

local

val space_proper =

  Scan.one T.is_blank -- Scan.many T.is_comment -- Scan.one T.is_proper;

val is_improper = not o (T.is_proper orf T.is_begin_ignore orf T.is_end_ignore);

val improper = Scan.many is_improper;

val improper_end = Scan.repeat (Scan.unless space_proper (Scan.one is_improper));

val blank_end = Scan.repeat (Scan.unless space_proper (Scan.one T.is_blank));

val opt_newline = Scan.option (Scan.one T.is_newline);

val ignore =

  Scan.depend (fn d => opt_newline |-- Scan.one T.is_begin_ignore

    >> pair (d + 1)) ||

  Scan.depend (fn d => Scan.one T.is_end_ignore --|

    (if d = 0 then Scan.fail_with (K "Bad nesting of meta-comments") else opt_newline)

    >> pair (d - 1));

val tag = (improper -- P.$$$ "%" -- improper) |-- P.!!! (P.tag_name --| blank_end);

val locale =

  Scan.option ((P.$$$ "(" -- improper -- P.$$$ "in") |--

    P.!!! (improper |-- P.xname --| (improper -- P.$$$ ")")));

in

fun process_thy lex default_tags is_markup trs src =

  let

    (* tokens *)

    val ignored = Scan.state --| ignore

      >> (fn d => (NONE, (NoToken, ("", d))));

    fun markup mark mk flag = Scan.peek (fn d =>

      improper |-- P.position (Scan.one (T.is_kind T.Command andf is_markup mark o T.content_of)) --

      Scan.repeat tag --

      P.!!!! ((improper -- locale -- improper) |-- P.doc_source --| improper_end)

      >> (fn (((tok, pos), tags), txt) =>

        let val name = T.content_of tok

        in (SOME (name, pos, tags), (mk (name, txt), (flag, d))) end));

    val command = Scan.peek (fn d =>

      P.position (Scan.one (T.is_kind T.Command)) --

      Scan.repeat tag

      >> (fn ((tok, pos), tags) =>

        let val name = T.content_of tok

        in (SOME (name, pos, tags), (BasicToken tok, (Latex.markup_false, d))) end));

    val cmt = Scan.peek (fn d =>

      P.$$$ "--" |-- P.!!!! (improper |-- P.doc_source)

      >> (fn txt => (NONE, (MarkupToken ("cmt", txt), ("", d)))));

    val other = Scan.peek (fn d =>

       P.not_eof >> (fn tok => (NONE, (BasicToken tok, ("", d)))));

    val token =

      ignored ||

      markup Markup MarkupToken Latex.markup_true ||

      markup MarkupEnv MarkupEnvToken Latex.markup_true ||

      markup Verbatim (VerbatimToken o #2) "" ||

      command || cmt || other;

    (* spans *)

    val is_eof = fn (_, (BasicToken x, _)) => T.is_eof x | _ => false;

    val stopper = Scan.stopper (K (NONE, (BasicToken T.eof, ("", 0)))) is_eof;

    val cmd = Scan.one (is_some o fst);

    val non_cmd = Scan.one (is_none o fst andf not o is_eof) >> #2;

    val comments = Scan.many (comment_token o fst o snd);

    val blank = Scan.one (blank_token o fst o snd);

    val newline = Scan.one (newline_token o fst o snd);

    val before_cmd =

      Scan.option (newline -- comments) --

      Scan.option (newline -- comments) --

      Scan.option (blank -- comments) -- cmd;

    val span =

      Scan.repeat non_cmd -- cmd --

        Scan.repeat (Scan.unless before_cmd non_cmd) --

        Scan.option (newline >> (single o snd))

      >> (fn (((toks1, (cmd, tok2)), toks3), tok4) =>

          make_span (the cmd) (toks1 @ (tok2 :: (toks3 @ the_default [] tok4))));

    val spans =

      src

      |> Source.filter (not o T.is_semicolon)

      |> Source.source' 0 T.stopper (Scan.error (Scan.bulk token)) NONE

      |> Source.source stopper (Scan.error (Scan.bulk span)) NONE

      |> Source.exhaust;

  in

    if length trs = length spans then

      ((NONE, []), NONE, true, Buffer.empty, (I, I))

      |> Toplevel.present_excursion (trs ~~ map (present_span lex default_tags) spans)

      |> present_trailer

    else error "Messed-up outer syntax for presentation"

  end;

end;

(** setup default output **)

(* options *)

val _ = add_options

 [("show_types", Library.setmp Syntax.show_types o boolean),

  ("show_sorts", Library.setmp Syntax.show_sorts o boolean),

  ("show_structs", Library.setmp show_structs o boolean),

  ("show_question_marks", Library.setmp show_question_marks o boolean),

  ("long_names", Library.setmp NameSpace.long_names o boolean),

  ("short_names", Library.setmp NameSpace.short_names o boolean),

  ("unique_names", Library.setmp NameSpace.unique_names o boolean),

  ("eta_contract", Library.setmp Syntax.eta_contract o boolean),

  ("locale", Library.setmp locale),

  ("display", Library.setmp display o boolean),

  ("break", Library.setmp break o boolean),

  ("quotes", Library.setmp quotes o boolean),

  ("mode", fn s => fn f => PrintMode.with_modes [s] f),

  ("margin", Pretty.setmp_margin o integer),

  ("indent", Library.setmp indent o integer),

  ("source", Library.setmp source o boolean),

  ("goals_limit", Library.setmp goals_limit o integer)];

(* basic pretty printing *)

val str_of_source = space_implode " " o map T.unparse o #2 o #1 o Args.dest_src;

fun tweak_line s =

  if ! display then s else Symbol.strip_blanks s;

val pretty_text = Pretty.chunks o map Pretty.str o map tweak_line o Library.split_lines;

fun pretty_term ctxt t = Syntax.pretty_term (Variable.auto_fixes t ctxt) t;

fun pretty_term_abbrev ctxt t = ProofContext.pretty_term_abbrev (Variable.auto_fixes t ctxt) t;

fun pretty_term_typ ctxt t =

  Syntax.pretty_term ctxt (TypeInfer.constrain (Term.fastype_of t) t);

fun pretty_term_typeof ctxt = Syntax.pretty_typ ctxt o Term.fastype_of;

fun pretty_const ctxt c =

  let

    val t = Const (c, Consts.type_scheme (ProofContext.consts_of ctxt) c)

      handle TYPE (msg, _, _) => error msg;

    val ([t'], _) = Variable.import_terms true [t] ctxt;

  in pretty_term ctxt t' end;

fun pretty_abbrev ctxt s =

  let

    val t = Syntax.parse_term ctxt s |> singleton (ProofContext.standard_infer_types ctxt);

    fun err () = error ("Abbreviated constant expected: " ^ Syntax.string_of_term ctxt t);

    val (head, args) = Term.strip_comb t;

    val (c, T) = Term.dest_Const head handle TERM _ => err ();

    val (U, u) = Consts.the_abbreviation (ProofContext.consts_of ctxt) c

      handle TYPE _ => err ();

    val t' = Term.betapplys (Envir.expand_atom T (U, u), args);

  in pretty_term_abbrev ctxt (Logic.mk_equals (t, t')) end;

fun pretty_thm ctxt = pretty_term ctxt o Thm.full_prop_of;

fun pretty_term_style ctxt (name, t) =

  pretty_term ctxt (TermStyle.the_style (ProofContext.theory_of ctxt) name ctxt t);

fun pretty_thm_style ctxt (name, th) =

  pretty_term_style ctxt (name, Thm.full_prop_of th);

fun pretty_prf full ctxt thms =

  Pretty.chunks (map (ProofSyntax.pretty_proof_of ctxt full) thms);

fun pretty_theory ctxt name =

  (Theory.requires (ProofContext.theory_of ctxt) name "presentation"; Pretty.str name);

(* Isar output *)

fun output_list pretty src ctxt xs =

  map (pretty ctxt) xs        (*always pretty in order to exhibit errors!*)

  |> (if ! source then K [pretty_text (str_of_source src)] else I)

  |> (if ! quotes then map Pretty.quote else I)

  |> (if ! display then

    map (Output.output o Pretty.string_of o Pretty.indent (! indent))

    #> space_implode "\\isasep\\isanewline%\n"

    #> enclose "\\begin{isabelle}%\n" "%\n\\end{isabelle}"

  else

    map (Output.output o (if ! break then Pretty.string_of else Pretty.str_of))

    #> space_implode "\\isasep\\isanewline%\n"

    #> enclose "\\isa{" "}");

fun output pretty src ctxt = output_list pretty src ctxt o single;

fun proof_state node =

  (case Option.map Toplevel.proof_node node of

    SOME (SOME prf) => ProofNode.current prf

  | _ => error "No proof state");

fun output_goals main_goal src node = args (Scan.succeed ()) (output (fn _ => fn _ =>

  Pretty.chunks (Proof.pretty_goals main_goal (proof_state node)))) src node;

fun ml_val txt = "fn _ => (" ^ txt ^ ");";

fun ml_type txt = "val _ = NONE : (" ^ txt ^ ") option;";

fun ml_struct txt = "functor DUMMY_FUNCTOR() = struct structure DUMMY = " ^ txt ^ " end;"

fun output_ml ml src ctxt (txt, pos) =

 (ML_Context.eval_in (SOME (Context.Proof ctxt)) false pos (ml txt);

  (if ! source then str_of_source src else SymbolPos.content (SymbolPos.explode (txt, pos)))

  |> (if ! quotes then quote else I)

  |> (if ! display then enclose "\\begin{verbatim}\n" "\n\\end{verbatim}"

  else

    split_lines

    #> map (space_implode "\\verb,|," o map (enclose "\\verb|" "|") o space_explode "|")

    #> space_implode "\\isasep\\isanewline%\n"));

(* embedded lemmas *)

fun pretty_lemma ctxt (prop, methods) =

  let

    val _ = ctxt

      |> Proof.theorem_i NONE (K I) [[(prop, [])]]

      |> Proof.global_terminal_proof methods;

  in pretty_term ctxt prop end;

val embedded_lemma =

  args (Args.prop -- Scan.lift (Args.$$$ "by" |-- Method.parse -- Scan.option Method.parse))

    (output pretty_lemma o (fn ((a, arg :: _), p) => (Args.src ((a, [arg]), p))) o Args.dest_src);

(* commands *)

val _ = OuterKeyword.keyword "by";

val _ = add_commands

 [("thm", args Attrib.thms (output_list pretty_thm)),

  ("thm_style", args (Scan.lift Args.liberal_name -- Attrib.thm) (output pretty_thm_style)),

  ("prop", args Args.prop (output pretty_term)),

  ("lemma", embedded_lemma),

  ("term", args Args.term (output pretty_term)),

  ("term_style", args (Scan.lift Args.liberal_name -- Args.term) (output pretty_term_style)),

  ("term_type", args Args.term (output pretty_term_typ)),

  ("typeof", args Args.term (output pretty_term_typeof)),

  ("const", args Args.const_proper (output pretty_const)),

  ("abbrev", args (Scan.lift Args.name_source) (output pretty_abbrev)),

  ("typ", args Args.typ_abbrev (output Syntax.pretty_typ)),

  ("text", args (Scan.lift Args.name) (output (K pretty_text))),

  ("goals", output_goals true),

  ("subgoals", output_goals false),

  ("prf", args Attrib.thms (output (pretty_prf false))),

  ("full_prf", args Attrib.thms (output (pretty_prf true))),

  ("theory", args (Scan.lift Args.name) (output pretty_theory)),

  ("ML", args (Scan.lift Args.name_source_position) (output_ml ml_val)),

  ("ML_type", args (Scan.lift Args.name_source_position) (output_ml ml_type)),

  ("ML_struct", args (Scan.lift Args.name_source_position) (output_ml ml_struct))];

end;