(*************************************************************************
 * Copyright (C) 
 *               2019      The University of Exeter 
 *               2018-2019 The University of Paris-Saclay
 *               2018      The University of Sheffield
 *
 * License:
 *   This program can be redistributed and/or modified under the terms
 *   of the 2-clause BSD-style license.
 *
 *   SPDX-License-Identifier: BSD-2-Clause
 *************************************************************************)

chapter \<open>The Document Ontology Framework for Isabelle\<close>

text\<open> Offering 
\<^item> text-elements that can be annotated with meta-information
\<^item> typed links to text-elements via specifically generated anti-quotations
\<^item> typed structure of this meta-information specifiable in an Ontology-Language ODL
  providing syntax and PIDE support of document classes 
\<^item> inner-syntax-antiquotations (ISA's) allowing to reference Isabelle-entities such as 
  types, terms, theorems inside the meta-information
\<^item> monitors allowing to enforce a specific textual structure of an Isabelle Document
\<^item> a basic infrastructure to define class invariants
  (for continuous checking of meta-information side-conditions of text-elements 
\<^item> LaTeX support. \<close> 
  
text\<open> In this section, we develop on the basis of a management of references Isar-markups
that provide direct support in the PIDE framework. \<close> 
  
theory Isa_DOF                (* Isabelle Document Ontology Framework *)
  imports  Main  
           RegExpInterface    (* Interface to functional regular automata for monitoring *)
           Assert 
           
  keywords "+=" ":=" "accepts" "rejects" "invariant"
           
  and      "open_monitor*" "close_monitor*" "declare_reference*" 
           "update_instance*" "doc_class" ::thy_decl

  and      "text*"      "text-macro*"     :: document_body 

  and      "print_doc_classes" "print_doc_items" 
           "print_doc_class_template" "check_doc_global" :: diag

  (* experimental *)  
  and      "corrollary*" "proposition*" "lemma*" "theorem*" :: thy_decl
           (* -- intended replacement of Isar std commands.*) 
      

           
  
begin

text\<open> @{footnote \<open>sdf\<close>}, @{file "$ISABELLE_HOME/src/Pure/ROOT.ML"}\<close> 

section\<open>Primitive Markup Generators\<close>
ML\<open>

val docrefN   = "docref";    
val docclassN = "doc_class";    

(* derived from: theory_markup *) 
fun docref_markup_gen refN def name id pos =
  if id = 0 then Markup.empty
  else
    Markup.properties (Position.entity_properties_of def id pos)
                      (Markup.entity refN name);   (* or better store the thy-name as property ? ? ? *)

val docref_markup = docref_markup_gen docrefN

val docclass_markup = docref_markup_gen docclassN

\<close>

section\<open> Utilities\<close>

ML\<open>
fun spy x y = (writeln (x ^ y); y)

fun markup2string x = XML.content_of (YXML.parse_body x)

(* a hacky, but save encoding of unicode comming from the interface to the string format
   that can be parsed by the inner-syntax string parser ''dfdf''. *)
fun bstring_to_holstring ctxt x (* (x:bstring) *) : string =
    let val term = Syntax.parse_term ctxt (markup2string x)
        fun hpp x = if x = #"\\" then "@" else 
                    if x = #"@"  then "@@" else String.implode [x] 
    in  term |>  Sledgehammer_Util.hackish_string_of_term ctxt
             |>  map hpp o String.explode |> String.concat
    end;


fun chopper p (x:string) = 
    let fun hss buff [] = rev buff
           |hss buff (S as a::R) = if p a then let val (front,rest) = chop_prefix p S
                                               in hss (String.implode front :: buff) rest end
                                   else        let val (front,rest) = chop_prefix (not o p) S
                                               in hss (String.implode front ::buff) rest end
    in hss [] (String.explode x) end;


fun holstring_to_bstring ctxt (x:string) : bstring  =
    let fun collapse "" = ""
           |collapse S = if String.sub(S,0) = #"@" 
                         then let val n = String.size S
                                  val front = replicate (n div 2) #"@" 
                                  val back  = if (n mod 2)=1 then [#"\\"] else []
                              in String.implode (front @ back) end 
                         else S;
        val t = String.concat (map collapse (chopper (fn x => x = #"@") x));
    in  t |>  Syntax.string_of_term ctxt o Syntax.parse_term ctxt end;

fun map_option _ NONE = NONE 
   |map_option f (SOME x) = SOME (f x);

fun map_optional _ s NONE = s 
   |map_optional f _ (SOME x) = f x;

fun map_fst f (x,y) = (f x,y)
fun map_snd f (x,y) = (x,f y)


\<close>

section\<open> A HomeGrown Document Type Management (the ''Model'') \<close>
  
ML\<open> 
structure DOF_core = 
struct

   type docclass_struct = {params         : (string * sort) list,          (*currently not used *)
                           name           : binding, 
                           thy_name       : string, id : serial,           (* for pide *)
                           inherits_from  : (typ list * string) option,    (* imports *)
                           attribute_decl : (binding*typ*term option)list, (* class local *)
                           rejectS        : term list,
                           rex            : term list,
                           invs           : ((string * Position.T) * term) list  } (* monitoring regexps --- product semantics*)


   type docclass_tab = docclass_struct Symtab.table

   val  initial_docclass_tab = Symtab.empty:docclass_tab 

   fun  merge_docclass_tab (otab,otab') = Symtab.merge (op =) (otab,otab') 


   val  default_cid = "text"    (* the top (default) document class: everything is a text.*)

   fun  is_subclass0 (tab:docclass_tab) s t =
        let val _ = case Symtab.lookup tab t of 
                          NONE => if t <> default_cid 
                                  then error ("document superclass not defined: "^t) 
                                  else default_cid
                       |  SOME _ => ""
            fun father_is_sub s = case Symtab.lookup tab s of 
                          NONE => error ("document subclass not defined: "^s)
                       |  SOME ({inherits_from=NONE, ...}) => s = t
                       |  SOME ({inherits_from=SOME (_,s'), ...}) => 
                                  s' = t orelse father_is_sub s' 
        in s = t orelse 
           (t = default_cid  andalso Symtab.defined tab s ) orelse
           (s <> default_cid andalso father_is_sub s)
        end

   type docobj =    {pos      : Position.T, 
                     thy_name : string,
                     value    : term,
                     inline   : bool, 
                     id       : serial, 
                     cid      : string}

   type docobj_tab ={tab      : (docobj option) Symtab.table,
                     maxano   : int
                    }
   
   val  initial_docobj_tab:docobj_tab = {tab = Symtab.empty, maxano = 0} 

   fun  merge_docobj_tab ({tab=otab,maxano=m}, {tab=otab',maxano=m'}) = 
                    (let fun X(NONE,NONE)       = false
                            |X(SOME _, NONE)    = false
                            |X(NONE, SOME _)    = false
                            |X(SOME b, SOME b') =  true (* b = b' *) 
                    in {tab=Symtab.merge X (otab,otab'),maxano=Int.max(m,m')}
                    end) 

   type ISA_transformer_tab = (theory -> term * typ * Position.T -> term option) Symtab.table
   val  initial_ISA_tab:ISA_transformer_tab = Symtab.empty

   type docclass_inv_tab = (string -> {is_monitor:bool} -> Context.generic -> bool) Symtab.table
   val  initial_docclass_inv_tab : docclass_inv_tab = Symtab.empty

   type open_monitor_info = {accepted_cids : string list,
                             rejected_cids : string list,
                             automatas     : RegExpInterface.automaton list
   }

   type monitor_tab = open_monitor_info Symtab.table
   val  initial_monitor_tab:monitor_tab = Symtab.empty

   fun override(t1,t2) = fold(Symtab.update)(Symtab.dest t2)(t1)

(* registrating data of the Isa_DOF component *)
structure Data = Generic_Data
(
  type T =     {docobj_tab          : docobj_tab,
                docclass_tab        : docclass_tab,
                ISA_transformer_tab : ISA_transformer_tab,
                monitor_tab         : monitor_tab,
                docclass_inv_tab    : docclass_inv_tab}
  val empty  = {docobj_tab          = initial_docobj_tab,
                docclass_tab        = initial_docclass_tab,
                ISA_transformer_tab = initial_ISA_tab,
                monitor_tab         = initial_monitor_tab,
                docclass_inv_tab    = initial_docclass_inv_tab
               } 
  val extend =  I
  fun merge(   {docobj_tab=d1,docclass_tab = c1,
                 ISA_transformer_tab = e1, monitor_tab=m1,
                 docclass_inv_tab = n1},
               {docobj_tab=d2,docclass_tab = c2,
                 ISA_transformer_tab = e2, monitor_tab=m2,
                 docclass_inv_tab = n2})  = 
               {docobj_tab=merge_docobj_tab   (d1,d2), 
                docclass_tab = merge_docclass_tab (c1,c2),
                ISA_transformer_tab = Symtab.merge (fn (_ , _) => false)(e1,e2),
                monitor_tab =  override(m1,m2), 
                     (* PROVISORY  ... ITS A REAL QUESTION HOW TO DO THIS!*)
                docclass_inv_tab = override(n1,n2)
                     (* PROVISORY  ... ITS A REAL QUESTION HOW TO DO THIS!*)
               }
);


val get_data = Data.get o Context.Proof;
val map_data = Data.map;
val get_data_global = Data.get o Context.Theory;
val map_data_global = Context.theory_map o map_data;


fun upd_docobj_tab f {docobj_tab,docclass_tab,ISA_transformer_tab, monitor_tab,docclass_inv_tab} = 
            {docobj_tab = f docobj_tab, docclass_tab=docclass_tab, 
             ISA_transformer_tab=ISA_transformer_tab, monitor_tab=monitor_tab,
             docclass_inv_tab=docclass_inv_tab};
fun upd_docclass_tab f {docobj_tab=x,docclass_tab = y,ISA_transformer_tab = z, monitor_tab,  docclass_inv_tab} = 
            {docobj_tab=x,docclass_tab = f y,ISA_transformer_tab = z, monitor_tab=monitor_tab,
             docclass_inv_tab=docclass_inv_tab};
fun upd_ISA_transformers f{docobj_tab=x,docclass_tab = y,ISA_transformer_tab = z, monitor_tab, docclass_inv_tab} = 
            {docobj_tab=x,docclass_tab = y,ISA_transformer_tab = f z, monitor_tab=monitor_tab, 
             docclass_inv_tab=docclass_inv_tab};
fun upd_monitor_tabs f {docobj_tab,docclass_tab,ISA_transformer_tab, monitor_tab, docclass_inv_tab} = 
            {docobj_tab = docobj_tab,docclass_tab = docclass_tab,
             ISA_transformer_tab = ISA_transformer_tab, monitor_tab = f monitor_tab, 
             docclass_inv_tab=docclass_inv_tab};
fun upd_docclass_inv_tab f {docobj_tab,docclass_tab,ISA_transformer_tab, monitor_tab, docclass_inv_tab} = 
            {docobj_tab = docobj_tab,docclass_tab = docclass_tab,
             ISA_transformer_tab = ISA_transformer_tab, monitor_tab = monitor_tab, 
             docclass_inv_tab    = f docclass_inv_tab};


fun get_accepted_cids  ({accepted_cids, ... } : open_monitor_info) = accepted_cids
fun get_automatas      ({automatas, ... }     : open_monitor_info) = automatas


(* doc-class-name management: We still use the record-package for internally 
   representing doc-classes. The main motivation is that "links" to entities are
   types over doc-classes, *types* in the Isabelle sense, enriched by additional data.
   This has the advantage that the type-inference can be abused to infer long-names
   for doc-class-names. Note, however, that doc-classes are currently implemented
   by non-polymorphic records only; this means that the extensible "_ext" versions
   of type names must be reduced to qualifier names only. The used Syntax.parse_typ 
   handling the identification does that already. 
   However, we use Syntax.read_typ in order to allow type-synonyms which requires
   an appropriate adaption in read_cid.*)
 
fun is_subclass (ctxt) s t = is_subclass0(#docclass_tab(get_data ctxt)) s t
fun is_subclass_global thy s t = is_subclass0(#docclass_tab(get_data_global thy)) s t


fun typ_to_cid (Type(s,[@{typ "unit"}])) = Long_Name.qualifier s
   |typ_to_cid (Type(_,[T])) = typ_to_cid T
   |typ_to_cid _ = error("type is not an ontological type.")


fun parse_cid ctxt cid =
(* parses a type lexically/syntactically, checks abscence of type vars *) 
         (case Syntax.parse_typ ctxt cid of
                 Type(tyname, [])  =>  tyname
                | _ => error "illegal type-format for doc-class-name.")
         handle ERROR _ => "" (* ignore error *)


fun read_cid ctxt "text" = default_cid (* text = default_cid *)
  | read_cid ctxt cid =
(* parses a type syntactically, type-identification, checking as class id *)
         (case Syntax.read_typ ctxt cid of
                 ty as Type(tyname, _)  => let val res = typ_to_cid ty 
                                               val t = #docclass_tab(get_data ctxt)
                                           in  if Symtab.defined t res 
                                               then res
                                               else error("type identifier not a class id:"^res) 
                                           end
                | _ => error "illegal type-format for doc-class-name.")
         handle ERROR _ =>  error("type identifier not a class id:"^cid) 

fun parse_cid_global thy cid = parse_cid (Proof_Context.init_global thy) cid
fun read_cid_global thy cid  = read_cid (Proof_Context.init_global thy) cid
        

fun is_defined_cid_global cid thy = 
(* works with short and long names *)
                                    let val t = #docclass_tab(get_data_global thy)
                                    in  cid=default_cid orelse 
                                        Symtab.defined t (parse_cid_global thy cid) 
                                    end

fun is_defined_cid_global' cid_long thy = 
(* works with long names only *)
                                    let val t = #docclass_tab(get_data_global thy)
                                    in  cid_long=default_cid orelse  Symtab.defined t cid_long end


fun is_defined_cid_local cid ctxt  = 
(* works with short and long names *)
                                     let val t = #docclass_tab(get_data ctxt)
                                     in  cid=default_cid orelse 
                                         Symtab.defined t (parse_cid ctxt cid) 
                                     end

fun is_defined_cid_local' cid_long ctxt  = 
(* works with long names only *)
                                     let val t = #docclass_tab(get_data ctxt)
                                     in  cid_long=default_cid orelse Symtab.defined t cid_long  end


fun is_declared_oid_global oid thy = let val {tab,...} = #docobj_tab(get_data_global thy)
                                     in  Symtab.defined tab oid end

fun is_declared_oid_local oid thy  = let val {tab,...} = #docobj_tab(get_data thy)
                                     in  Symtab.defined tab oid end

fun is_defined_oid_global oid thy  = let val {tab,...} = #docobj_tab(get_data_global thy)
                                     in  case Symtab.lookup tab oid of 
                                           NONE => false
                                          |SOME(NONE) => false
                                          |SOME _ => true
                                     end

fun is_defined_oid_local oid thy   = let val {tab,...} = #docobj_tab(get_data thy)
                                     in  case Symtab.lookup tab oid of 
                                           NONE => false
                                          |SOME(NONE) => false
                                          |SOME _ => true
                                     end


fun declare_object_global oid thy  =  
    let fun decl {tab=t,maxano=x} = {tab=Symtab.update_new(oid,NONE)t, maxano=x}
    in (map_data_global (upd_docobj_tab(decl)) (thy)
       handle Symtab.DUP _ => error("multiple declaration of document reference"))
    end

fun declare_object_local oid ctxt  =
    let fun decl {tab,maxano} = {tab=Symtab.update_new(oid,NONE) tab, maxano=maxano}
    in  (map_data(upd_docobj_tab decl)(ctxt)
        handle Symtab.DUP _ => error("multiple declaration of document reference"))
    end


fun update_class_invariant cid_long f thy = 
    let val  _ = if is_defined_cid_global' cid_long thy then () 
                 else error("undefined class id : " ^cid_long)
    in  map_data_global (upd_docclass_inv_tab (Symtab.update (cid_long, 
                        (fn ctxt => ((writeln("Inv check of : " ^cid_long); f ctxt )))))) 
                        thy
    end

fun get_class_invariant cid_long thy =
    let val  _ = if is_defined_cid_global' cid_long thy then () 
                 else error("undefined class id : " ^cid_long)
        val {docclass_inv_tab, ...} =  get_data_global thy
    in  case Symtab.lookup  docclass_inv_tab cid_long of 
            NONE   => K(K(K true))
          | SOME f => f
    end

val SPY = Unsynchronized.ref(Bound 0)

fun check_regexps term = 
    let val _ = case fold_aterms  Term.add_free_names term [] of
                   n::_ => error("No free variables allowed in monitor regexp:" ^ n)
                 | _ => ()  
        val _ = case fold_aterms  Term.add_var_names term [] of
                   (n,_)::_ => error("No schematic variables allowed in monitor regexp:" ^ n)
                 | _ => ()
        (* Missing: Checks on constants such as undefined, ... *)
    in  term end

fun check_reject_atom cid_long term = 
    let val _ = case fold_aterms  Term.add_free_names term [] of
                   n::_ => error("No free variables allowed in monitor regexp:" ^ n)
                 | _ => ()  
        val _ = case fold_aterms  Term.add_var_names term [] of
                   (n,_)::_ => error("No schematic variables allowed in monitor regexp:" ^ n)
                 | _ => ()
        (* Missing: Checks on constants such as undefined, ... *)
    in  term end


fun define_doc_class_global (params', binding) parent fields rexp reject_Atoms invs thy  = 
(* This operation is executed in a context where the record has amready been defined, but
   its conversion into a class is not yet done. *)
    let val nn = Context.theory_name thy (* in case that we need the thy-name to identify
                                            the space where it is ... *)
        val cid = (Binding.name_of binding)
        val pos = (Binding.pos_of binding)
    
        val _   = if is_defined_cid_global cid thy
                  then error("redefinition of document class:"^cid )
                  else ()
        
        val parent' = map_option (map_snd (read_cid_global thy)) parent

        (* weird construction. Necessary since parse produces at rare cases 
           string representations that do no longer have the lexis of a type name. *)
        val cid_long  = parse_cid_global thy cid
        val cid_long' = parse_cid_global thy cid_long
        val _ = if cid_long' <> "" then ()
                else error("Could not construct type from doc_class (lexical problem?)")

        val id = serial ();
        val _ = Position.report pos (docclass_markup true cid id pos);
    
        val rejectS = map (Syntax.read_term_global thy) reject_Atoms;
        val _ = map (check_reject_atom cid_long)  rejectS; 
        val reg_exps = map (Syntax.read_term_global thy) rexp;
        val _ = map check_regexps reg_exps
        val _ = if not(null rejectS) andalso (null reg_exps) 
                then  error ("reject clause requires accept clause ! " ) else ();
        val _ = if has_duplicates (op =) (map (fst o fst) invs) 
                then error("invariant labels must be unique"^  Position.here (snd(fst(hd invs)))) 
                else ()
        val invs' = map (map_snd(Syntax.read_term_global thy)) invs 
        val info = {params=params', 
                    name = binding, 
                    thy_name = nn, 
                    id = id, (* for pide --- really fresh or better reconstruct 
                                from prior record definition ? For the moment: own
                                generation of serials ... *)
                    inherits_from = parent',
                    attribute_decl = fields , 
                    rejectS = rejectS,
                    rex = reg_exps, 
                    invs =  invs'}
    
    in   map_data_global(upd_docclass_tab(Symtab.update(cid_long,info)))(thy)
    end


fun define_object_global (oid, bbb) thy  = 
    let val nn = Context.theory_name thy (* in case that we need the thy-name to identify
                                            the space where it is ... *)
    in  if is_defined_oid_global oid thy 
        then error("multiple definition of document reference")
        else map_data_global  (upd_docobj_tab(fn {tab=t,maxano=x} =>            
                                        {tab=Symtab.update(oid,SOME bbb) t,
                                         maxano=x}))
                              (thy)
    end
            
fun define_object_local (oid, bbb) ctxt  = 
    map_data (upd_docobj_tab(fn{tab,maxano}=>{tab=Symtab.update(oid,SOME bbb)tab,maxano=maxano})) ctxt


(* declares an anonyme label of a given type and generates a unique reference ...  *)
fun declare_anoobject_global thy cid = 
    let fun declare {tab,maxano} = let val str = cid^":"^Int.toString(maxano+1)
                                       val _ = writeln("Anonymous reference declared: " ^ str)
                                   in  {tab=Symtab.update(str,NONE)tab,maxano= maxano+1} end
    in  map_data_global (upd_docobj_tab declare) (thy)
    end

fun declare_anoobject_local ctxt cid = 
    let fun declare {tab,maxano} = let val str = cid^":"^Int.toString(maxano+1)
                                           val _ = writeln("Anonymous reference declared: " ^str)
                                       in  {tab=Symtab.update(str,NONE)tab, maxano=maxano+1} end
    in map_data (upd_docobj_tab declare) (ctxt) 
    end


fun get_object_global_opt oid thy  = Symtab.lookup (#tab(#docobj_tab(get_data_global thy))) oid 

fun get_object_global oid thy  = case get_object_global_opt oid thy of 
                                       NONE => error("undefined reference: "^oid)
                                      |SOME(bbb) => bbb

fun get_object_local_opt oid ctxt  = Symtab.lookup (#tab(#docobj_tab(get_data ctxt))) oid

fun get_object_local oid ctxt  = case get_object_local_opt oid ctxt of 
                                       NONE => error("undefined reference: "^oid)
                                      |SOME(bbb) => bbb

fun get_doc_class_global cid thy = 
    if cid = default_cid then error("default class acces") (* TODO *)
    else let val t = #docclass_tab(get_data_global thy)
         in  (Symtab.lookup t cid) end
    

fun get_doc_class_local cid ctxt = 
    if cid = default_cid then error("default class acces") (* TODO *)
    else let val t = #docclass_tab(get_data ctxt)
         in  (Symtab.lookup t cid) end


fun is_defined_cid_local cid ctxt  = let val t = #docclass_tab(get_data ctxt)
                                     in  cid=default_cid orelse 
                                         Symtab.defined t (parse_cid ctxt cid) 
                                     end


fun get_attributes_local cid ctxt =
    if cid = default_cid then []
    else let val t = #docclass_tab(get_data ctxt)
             val cid_long = read_cid ctxt cid (* to assure that the given cid is really a long_cid *)
         in  case Symtab.lookup t cid_long of
               NONE => error("undefined class id for attributes: "^cid)
             | SOME ({inherits_from=NONE,
                       attribute_decl = X, ...}) => [(cid_long,X)]
             | SOME ({inherits_from=SOME(_,father),
                       attribute_decl = X, ...}) => get_attributes_local father ctxt @ [(cid_long,X)]
         end

fun get_attributes cid thy = get_attributes_local cid (Proof_Context.init_global thy)

type attributes_info = { def_occurrence : string,
                         def_pos        : Position.T,
                         long_name      : string,
                         typ            : typ
                       }

fun get_attribute_info_local (*long*)cid attr ctxt : attributes_info option=
    let val hierarchy = get_attributes_local cid ctxt  (* search in order *)
        fun found (s,L) = case find_first (fn (bind,_,_) => Binding.name_of bind = attr) L of
                            NONE => NONE
                          | SOME X => SOME(s,X)
    in  case get_first found hierarchy of
           NONE => NONE
         | SOME (cid',(bind, ty,_)) => SOME({def_occurrence = cid,
                                             def_pos = Binding.pos_of bind,
                                             long_name = cid'^"."^(Binding.name_of bind), 
                                             typ = ty})
    end

fun get_attribute_info (*long*)cid attr thy = 
        get_attribute_info_local cid attr (Proof_Context.init_global thy)

fun get_attribute_defaults (* long*)cid thy = 
    let val attrS = flat(map snd (get_attributes cid thy))
        fun trans (_,_,NONE) = NONE
           |trans (na,ty,SOME def) =SOME(na,ty, def)
    in  map_filter trans attrS end

fun get_value_global oid thy  = case get_object_global oid thy of
                                   SOME{value=term,...} => SOME term
                                 | NONE => NONE  

fun get_value_local oid ctxt  = case get_object_local oid ctxt of
                                   SOME{value=term,...} => SOME term
                                 | NONE => NONE  

(* missing : setting terms to ground (no type-schema vars, no schema vars. )*)
fun update_value_global oid upd thy  = 
          case get_object_global oid thy of
               SOME{pos,thy_name,value,inline,id,cid} => 
                   let val tab' = Symtab.update(oid,SOME{pos=pos,thy_name=thy_name,
                                                         value=upd value,id=id, 
                                                         inline=inline,cid=cid})
                   in  map_data_global (upd_docobj_tab(fn{tab,maxano}=>{tab=tab' tab,maxano=maxano})) thy end
             | NONE => error("undefined doc object: "^oid)  


val ISA_prefix = "Isa_DOF.ISA_"  (* ISA's must be declared in Isa_DOF.thy  !!! *)

fun get_isa_global isa thy  =  
            case Symtab.lookup (#ISA_transformer_tab(get_data_global thy)) (ISA_prefix^isa) of 
                 NONE      => error("undefined inner syntax antiquotation: "^isa)
               | SOME(bbb) => bbb
                               

fun get_isa_local isa ctxt  = case Symtab.lookup (#ISA_transformer_tab(get_data ctxt)) (ISA_prefix^isa) of 
                                       NONE => error("undefined inner syntax antiquotation: "^isa)
                                      |SOME(bbb) => bbb

fun update_isa_local (isa, trans) ctxt  = 
    map_data (upd_ISA_transformers(Symtab.update(ISA_prefix^isa,trans))) ctxt

fun update_isa_global (isa, trans) thy  = 
    map_data_global (upd_ISA_transformers(Symtab.update(ISA_prefix^isa,trans))) thy


fun transduce_term_global (term,pos) thy = 
    (* pre: term should be fully typed in order to allow type-related term-transformations *)
    let val tab = #ISA_transformer_tab(get_data_global thy)
        fun T(Const(s,ty) $ t) = if String.isPrefix ISA_prefix s
                                 then case Symtab.lookup tab s of
                                        NONE => error("undefined inner syntax antiquotation: "^s)
                                      | SOME(trans) => (case trans thy (t,ty,pos) of 
                                                         NONE => Const(s,ty) $ t
                                                         (* checking isa, may raise error though. *)        
                                                       | SOME t => Const(s,ty) $ t)
                                                         (* transforming isa *)
                                 else (Const(s,ty) $ (T t))
          |T(t1 $ t2) = T(t1) $ T(t2)
          |T(Abs(s,ty,t)) = Abs(s,ty,T t)
          |T t = t
    in   T term end


fun writeln_classrefs ctxt = let  val tab = #docclass_tab(get_data ctxt)
                             in   writeln (String.concatWith "," (Symtab.keys tab)) end


fun writeln_docrefs ctxt = let  val {tab,...} = #docobj_tab(get_data ctxt)
                           in   writeln (String.concatWith "," (Symtab.keys tab)) end

fun print_doc_items b ctxt = 
    let val {docobj_tab={tab = x, ...},...}= get_data ctxt;
        val _ = writeln "=====================================";  
        fun dfg true = "true" 
           |dfg false= "false"   
        fun print_item (n, SOME({cid,id,pos,thy_name,inline,value})) =
                 (writeln ("docitem: "^n);
                  writeln ("    type:    "^cid);
                  writeln ("    origine: "^thy_name);
                  writeln ("    inline:  "^dfg inline);
                  writeln ("    value:   "^(Syntax.string_of_term ctxt value))
                 )
          | print_item (n, NONE) = 
                 (writeln ("forward reference for docitem: "^n));
    in  map print_item (Symtab.dest x); 
        writeln "=====================================\n\n\n" end;


fun print_docclass_template cid ctxt = 
    let val cid_long = read_cid ctxt cid  (* assure that given cid is really a long_cid *)
        val brute_hierarchy = (get_attributes_local cid_long ctxt)
        val flatten_hrchy = flat o (map(fn(lname, attrS) => 
                                           map (fn (s,_,_)=>(lname,(Binding.name_of s))) attrS))
        fun filter_overrides [] = []
           |filter_overrides ((ln,s)::S) = (ln,s):: filter_overrides(filter(fn(_,s')=> s<>s')S) 
        val hierarchy = map (fn(ln,s)=>ln^"."^s)(filter_overrides(flatten_hrchy brute_hierarchy)) 
        val args = String.concatWith "=%\n , " ("  label=,type":: hierarchy);
        val template = "\\newisadof{"^cid_long^"}%\n["^args^"=%\n][1]\n{%\n#1%\n}\n\n";
    in writeln template end;


fun print_doc_classes b ctxt = 
    let val {docobj_tab={tab = x, ...},docclass_tab, ...} = get_data ctxt;
        val _ = writeln "=====================================";    
        fun print_attr (n, ty, NONE) = (Binding.print n)
          | print_attr (n, ty, SOME t)= (Binding.print n^"("^Syntax.string_of_term ctxt t^")")
        fun print_inv ((lab,pos),trm) = (lab ^"::"^Syntax.string_of_term ctxt trm)
        fun print_class (n, {attribute_decl, id, inherits_from, name, params, thy_name, rejectS, rex,invs}) =
           (case inherits_from of 
               NONE => writeln ("docclass: "^n)
             | SOME(_,nn) => writeln ("docclass: "^n^" = "^nn^" + ");
            writeln ("    name:    "^(Binding.print name));
            writeln ("    origin:  "^thy_name);
            writeln ("    attrs:   "^commas (map print_attr attribute_decl));
            writeln ("    invs:    "^commas (map print_inv invs))
           );
    in  map print_class (Symtab.dest docclass_tab); 
        writeln "=====================================\n\n\n" 
    end;

fun check_doc_global (strict_checking : bool) ctxt = 
    let val {docobj_tab={tab = x, ...}, monitor_tab, ...} = get_data ctxt;
        val S = map_filter (fn (s,NONE) => SOME s | _ => NONE) (Symtab.dest x)
        val T = map fst (Symtab.dest monitor_tab)
    in if null S 
       then if null T then ()
            else error("Global consistency error - there are open monitors:  "
                  ^ String.concatWith "," T) 
       else error("Global consistency error - Unresolved forward references: "
                  ^ String.concatWith "," S)   
    end 

val _ =
  Outer_Syntax.command \<^command_keyword>\<open>print_doc_classes\<close> "print document classes"
    (Parse.opt_bang >> (fn b => Toplevel.keep (print_doc_classes b o Toplevel.context_of)));

val _ =
  Outer_Syntax.command \<^command_keyword>\<open>print_doc_class_template\<close> 
                       "print document class latex template"
    (Parse.string >> (fn b => Toplevel.keep (print_docclass_template b o Toplevel.context_of)));


val _ =
  Outer_Syntax.command \<^command_keyword>\<open>print_doc_items\<close>  "print document items"
    (Parse.opt_bang >> (fn b => Toplevel.keep (print_doc_items b o Toplevel.context_of)));

val _ =
  Outer_Syntax.command \<^command_keyword>\<open>check_doc_global\<close> "check global document consistency"
    (Parse.opt_bang >> (fn b => Toplevel.keep (check_doc_global b o Toplevel.context_of)));

val (strict_monitor_checking, strict_monitor_checking_setup) 
     = Attrib.config_bool \<^binding>\<open>strict_monitor_checking\<close> (K false);

end (* struct *)

\<close>

setup\<open>DOF_core.strict_monitor_checking_setup\<close>

section\<open> Syntax for Term Annotation Antiquotations (TA)\<close>

text\<open>Isabelle/DOF allows for annotations at the term level, for which an
antiquotation syntax and semantics is defined at the inner syntax level.
(For this reasons, the mechanism has been called somewhat misleading
\<^emph>\<open>inner syntax antiquotations\<close> in earlier versions of Isabelle/DOF.)

For the moment, only a fixed number of builtin TA's is supported, future
versions might extend this feature substantially.\<close>

subsection\<open> Syntax \<close> 

typedecl "doc_class"
typedecl "typ"
typedecl "term"
typedecl "thm"
typedecl "file"
typedecl "thy"
 
\<comment> \<open>and others in the future : file, http, thy, ...\<close> 

consts ISA_typ          :: "string \<Rightarrow> typ"               ("@{typ _}")
consts ISA_term         :: "string \<Rightarrow> term"              ("@{term _}")
consts ISA_term_repr    :: "string \<Rightarrow> term"              ("@{termrepr _}")
consts ISA_thm          :: "string \<Rightarrow> thm"               ("@{thm _}")
consts ISA_file         :: "string \<Rightarrow> file"              ("@{file _}")
consts ISA_thy          :: "string \<Rightarrow> thy"               ("@{thy _}")
consts ISA_docitem      :: "string \<Rightarrow> 'a"                ("@{docitem _}")
consts ISA_docitem_attr :: "string \<Rightarrow> string \<Rightarrow> 'a"      ("@{docitemattr (_) :: (_)}")

\<comment> \<open>Dynamic setup of inner syntax cartouche\<close>

ML \<open>
(*  Author:     Frédéric Tuong, Université Paris-Saclay *)
(*  Title:      HOL/ex/Cartouche_Examples.thy
    Author:     Makarius
*)
  local
    fun mk_char (f_char, f_cons, _) (s, _) accu =
        fold
          (fn c => fn (accu, l) =>
            (f_char c accu, f_cons c l))
          (rev (map Char.ord (String.explode s)))
          accu;

    fun mk_string (_, _, f_nil) accu [] = (accu, f_nil)
      | mk_string f accu (s :: ss) = mk_char f s (mk_string f accu ss);
  in
    fun string_tr f f_mk accu content args =
      let fun err () = raise TERM ("string_tr", args) in
        (case args of
          [(c as Const (@{syntax_const "_constrain"}, _)) $ Free (s, _) $ p] =>
            (case Term_Position.decode_position p of
              SOME (pos, _) => c $ f (mk_string f_mk accu (content (s, pos))) $ p
            | NONE => err ())
        | _ => err ())
      end;
  end;
\<close>

syntax "_cartouche_string" :: "cartouche_position \<Rightarrow> _"  ("_")

ML\<open>
structure Cartouche_Grammar = struct
  fun list_comb_mk cst n c = list_comb (Syntax.const cst, String_Syntax.mk_bits_syntax n c)
  val nil1 = Syntax.const @{const_syntax String.empty_literal}
  fun cons1 c l = list_comb_mk @{const_syntax String.Literal} 7 c $ l

  val default =
    [ ( "char list"
      , ( Const (@{const_syntax Nil}, @{typ "char list"})
        , fn c => fn l => Syntax.const @{const_syntax Cons} $ list_comb_mk @{const_syntax Char} 8 c $ l
        , snd))
    , ( "String.literal", (nil1, cons1, snd))]
end
\<close>

ML\<open>
fun parse_translation_cartouche binding l f_integer accu =
  let val cartouche_type = Attrib.setup_config_string binding (K (fst (hd l)))
      (* if there is no type specified, by default we set the first element
         to be the default type of cartouches *) in
  fn ctxt =>
    let val cart_type = Config.get ctxt cartouche_type in
    case List.find (fn (s, _) => s = cart_type) l of
      NONE => error ("Unregistered return type for the cartouche: \"" ^ cart_type ^ "\"")
    | SOME (_, (nil0, cons, f)) =>
        string_tr f (f_integer, cons, nil0) accu (Symbol_Pos.cartouche_content o Symbol_Pos.explode)
    end
  end
\<close>

parse_translation \<open>
  [( @{syntax_const "_cartouche_string"}
   , parse_translation_cartouche \<^binding>\<open>cartouche_type\<close> Cartouche_Grammar.default (K I) ())]
\<close>

(* tests *)  
term "@{typ  ''int => int''}"  
term "@{term ''Bound 0''}"  
term "@{thm  ''refl''}"  
term "@{docitem  ''<doc_ref>''}"
ML\<open>   @{term "@{docitem  ''<doc_ref>''}"}\<close>

term "@{typ  \<open>int \<Rightarrow> int\<close>}"  
term "@{term \<open>\<forall>x. P x \<longrightarrow> Q\<close>}"  
term "@{thm  \<open>refl\<close>}"  
term "@{docitem  \<open>doc_ref\<close>}"
ML\<open>   @{term "@{docitem  \<open>doc_ref\<close>}"}\<close>
(**)
declare [[cartouche_type = "String.literal"]]
term "\<open>Université\<close> :: String.literal"
declare [[cartouche_type = "char list"]]
term "\<open>Université\<close> :: char list"



subsection\<open> Semantics \<close>

ML\<open>
structure ISA_core = 
struct

fun err msg pos = error (msg ^ Position.here pos);

fun check_path check_file ctxt dir (name, pos) =
  let
    val _ = Context_Position.report ctxt pos Markup.language_path;

    val path = Path.append dir (Path.explode name) handle ERROR msg => err msg pos;
    val _ = Path.expand path handle ERROR msg => err msg pos;
    val _ = Context_Position.report ctxt pos (Markup.path (Path.smart_implode path));
    val _ =
      (case check_file of
        NONE => path
      | SOME check => (check path handle ERROR msg => err msg pos));
  in path end;


fun ML_isa_antiq check_file thy (name, _, pos) =
  let val path = check_path check_file (Proof_Context.init_global thy) Path.current (name, pos);
  in "Path.explode " ^ ML_Syntax.print_string (Path.implode path) end;


fun ML_isa_check_generic check thy (term, pos) =
  let val name = (HOLogic.dest_string term
                  handle TERM(_,[t]) => error ("wrong term format: must be string constant: " 
                                               ^ Syntax.string_of_term_global thy t ))
      val _ = check thy (name,pos)
  in  SOME term end;  


fun ML_isa_check_typ thy (term, _, pos) =
  let fun check thy (name, _) = let val ctxt = (Proof_Context.init_global thy)
                                in (Syntax.check_typ ctxt o Syntax.parse_typ ctxt) name end
  in  ML_isa_check_generic check thy (term, pos) end 


fun ML_isa_check_term thy (term, _, pos) =
  let fun check thy (name, _) = let val ctxt = (Proof_Context.init_global thy)
                                in (Syntax.check_term ctxt o Syntax.parse_term ctxt) name end 
  in  ML_isa_check_generic check thy (term, pos) end 


fun ML_isa_check_thm thy (term, _, pos) =
  (* this works for long-names only *)
  let fun check thy (name, _) = case Proof_Context.lookup_fact (Proof_Context.init_global thy) name of
                                  NONE => err ("No Theorem:" ^name) pos
                                | SOME X => X
  in   ML_isa_check_generic check thy (term, pos) end 


fun ML_isa_check_file thy (term, _, pos) =
  let fun check thy (name, pos) = check_path (SOME File.check_file) 
                                             (Proof_Context.init_global thy) 
                                             (Path.current) 
                                             (name, pos);
  in  ML_isa_check_generic check thy (term, pos) end;


fun ML_isa_id thy (term,pos) = SOME term


fun ML_isa_check_docitem thy (term, req_ty, pos) =
  let fun check thy (name, _) = 
           if DOF_core.is_declared_oid_global name thy 
           then case DOF_core.get_object_global name thy of
                    NONE => warning("oid declared, but not yet defined --- "^
                                    " type-check incomplete")
                 |  SOME {pos=pos_decl,cid,id,...} => 
                         let val ctxt = (Proof_Context.init_global thy)
                             val req_class = case req_ty of 
                                         Type("fun",[_,T]) =>  DOF_core.typ_to_cid T
                                       | _ => error("can not infer type for: "^ name)
                         in if cid <> DOF_core.default_cid 
                               andalso not(DOF_core.is_subclass ctxt cid req_class)
                            then error("reference ontologically inconsistent: "^ 
                                       Position.here pos_decl)
                            else ()
                         end
           else err ("faulty reference to docitem: "^name) pos
  in  ML_isa_check_generic check thy (term, pos) end 

(* utilities *)

fun property_list_dest ctxt X = (map (fn Const ("Isa_DOF.ISA_term", _) $ s => HOLogic.dest_string s 
                                        |Const ("Isa_DOF.ISA_term_repr",_) $ s 
                                                  => holstring_to_bstring ctxt (HOLogic.dest_string s))  
                                     (HOLogic.dest_list X))

end; (* struct *)
                                                            
\<close>


subsection\<open> Isar - Setup\<close>

setup\<open>DOF_core.update_isa_global("typ"      ,ISA_core.ML_isa_check_typ) \<close>     
setup\<open>DOF_core.update_isa_global("term"     ,ISA_core.ML_isa_check_term) \<close>     
setup\<open>DOF_core.update_isa_global("term_repr",fn _ => fn (t,_,_) => SOME t) \<close>     
setup\<open>DOF_core.update_isa_global("thm"      ,ISA_core.ML_isa_check_thm) \<close>     
setup\<open>DOF_core.update_isa_global("file"     ,ISA_core.ML_isa_check_file) \<close>     
setup\<open>DOF_core.update_isa_global("docitem"  ,ISA_core.ML_isa_check_docitem)\<close>     

section\<open> Syntax for Annotated Documentation Commands (the '' View'' Part I) \<close>


(*
================== 2018 ====================================================== 
(* Exported from Pure_Syn *)

fun output_document state markdown txt =
  let
    val ctxt = Toplevel.presentation_context state;
    val _ =
      Context_Position.report ctxt
        (Input.pos_of txt) (Markup.language_document (Input.is_delimited txt));
  in Thy_Output.output_document ctxt markdown txt end;

fun document_command markdown (loc, txt) =
  Toplevel.keep (fn state =>
    (case loc of
      NONE => ignore (output_document state markdown txt)
    | SOME (_, pos) =>
        error ("Illegal target specification -- not a theory context" ^ Position.here pos))) o
  Toplevel.present_local_theory loc (fn state =>
    ignore (output_document state markdown txt));


====================== 2017 ===================================================

(* Exported from Thy_Output *)
fun document_command markdown (loc, txt) =
  Toplevel.keep (fn state =>
    (case loc of
      NONE => ignore (output_text state markdown txt)
    | SOME (_, pos) =>
        error ("Illegal target specification -- not a theory context" ^ Position.here pos))) o
  Toplevel.present_local_theory loc (fn state => ignore (output_text state markdown txt));


 *)




ML\<open>
structure ODL_Command_Parser = 
struct


type meta_args_t = (((string * Position.T) *
                     (string * Position.T) option)
                    * ((string * Position.T) * string) list)

val semi = Scan.option (Parse.$$$ ";");
val is_improper = not o (Token.is_proper orf Token.is_begin_ignore orf Token.is_end_ignore);
val improper = Scan.many is_improper; (* parses white-space and comments *)

val attribute =
    Parse.position Parse.const
    --| improper 
    -- Scan.optional (Parse.$$$ "=" --| improper |-- Parse.!!! Parse.term --| improper) "True"
   : ((string * Position.T) * string) parser;

val attribute_upd  : (((string * Position.T) * string) * string) parser =
    Parse.position Parse.const 
    --| improper
    -- ((@{keyword "+="} --| improper) || (@{keyword ":="} --| improper))
    -- Parse.!!! Parse.term
    --| improper
    : (((string * Position.T) * string) * string) parser;

val reference =
    Parse.position Parse.name 
    --| improper
    -- Scan.option (Parse.$$$ "::" 
                    -- improper 
                    |-- (Parse.!!! (Parse.position Parse.name))
                    ) 
    --| improper;


val attributes =  
    ((Parse.$$$ "["
      -- improper 
     |-- (reference -- 
         (Scan.optional(Parse.$$$ "," -- improper |-- (Parse.enum "," (improper |-- attribute)))) []))
     --| Parse.$$$ "]"
     --| improper)  : meta_args_t parser 

val attributes_upd =  
    ((Parse.$$$ "[" 
     -- improper 
     |-- (reference -- 
         (Scan.optional(Parse.$$$ "," -- improper |-- (Parse.enum "," (improper |-- attribute_upd)))) []))
     --| Parse.$$$ "]")
     --| improper



fun cid_2_cidType cid_long thy =
    if cid_long = DOF_core.default_cid then @{typ "unit"}
    else let val t = #docclass_tab(DOF_core.get_data_global thy)
             fun ty_name cid = cid^"."^  Long_Name.base_name cid^"_ext"
             fun fathers cid_long = case Symtab.lookup t cid_long of
                       NONE => let val ctxt = Proof_Context.init_global thy
                                   val tty = Syntax.parse_typ (Proof_Context.init_global thy) cid_long
                                   val _ = writeln ("XXX"^(Syntax.string_of_typ ctxt tty))
                               in  error("undefined doc class id :"^cid_long)
                               end 
                     | SOME ({inherits_from=NONE, ...}) => [cid_long]
                     | SOME ({inherits_from=SOME(_,father), ...}) => 
                           cid_long :: (fathers father) 
         in fold (fn x => fn y => Type(ty_name x,[y])) (fathers cid_long) @{typ "unit"}  
         end

fun base_default_term thy cid_long = Const(@{const_name "undefined"},cid_2_cidType thy cid_long) 

fun check_classref {is_monitor=is_monitor} (SOME(cid,pos')) thy = 
          let 
              val cid_long = DOF_core.read_cid_global thy cid  
                            
              val {id, name=bind_target,rex,...} = the(DOF_core.get_doc_class_global cid_long thy)
              val _ = if is_monitor andalso (null rex orelse cid_long= DOF_core.default_cid ) 
                      then error("should be monitor class!")
                      else ()
              val markup = docclass_markup false cid id (Binding.pos_of bind_target);
              val ctxt = Context.Theory thy
              val _    = Context_Position.report_generic ctxt pos' markup;
          in  cid_long 
          end
   | check_classref _ NONE _ = DOF_core.default_cid 


fun generalize_typ n = Term.map_type_tfree (fn (str,sort)=> Term.TVar((str,n),sort));
fun infer_type thy term = hd (Type_Infer_Context.infer_types (Proof_Context.init_global thy) [term])


fun calc_update_term thy cid_long (S:(string * Position.T * string * term)list) term = 
    let val cid_ty = cid_2_cidType cid_long thy 
        val generalize_term =  Term.map_types (generalize_typ 0)
        fun toString t = Syntax.string_of_term (Proof_Context.init_global thy) t  
        fun instantiate_term S t = Term_Subst.map_types_same (Term_Subst.instantiateT S) (t)
        fun read_assn (lhs, pos:Position.T, opr, rhs) term =
            let val info_opt = DOF_core.get_attribute_info cid_long (Long_Name.base_name lhs) thy
                val (ln,lnt,lnu,lnut) = case info_opt of 
                                           NONE => error ("unknown attribute >" 
                                                          ^((Long_Name.base_name lhs))
                                                          ^"< in class: "^cid_long)
                                        |  SOME{long_name, typ, ...} => (long_name, typ, 
                                                                         long_name ^"_update",
                                                                         (typ --> typ) 
                                                                          --> cid_ty --> cid_ty)
                val tyenv = Sign.typ_match thy  ((generalize_typ 0)(type_of rhs), lnt) (Vartab.empty)
                            handle Type.TYPE_MATCH => (error ("type of attribute: " ^ ln 
                                                             ^ " does not fit to term: " 
                                                             ^ toString rhs));
                val tyenv' = (map (fn (s,(t,u)) => ((s,t),u)) (Vartab.dest tyenv))
                val _ = if Long_Name.base_name lhs = lhs orelse ln = lhs then ()
                        else error("illegal notation for attribute of "^cid_long)
                fun join (ttt as @{typ "int"}) 
                         = Const (@{const_name "Groups.plus"}, ttt --> ttt --> ttt)
                   |join (ttt as @{typ "string"}) 
                         = Const (@{const_name "List.append"}, ttt --> ttt --> ttt)
                   |join (ttt as Type(@{type_name "set"},_)) 
                         = Const (@{const_name "Lattices.sup"}, ttt --> ttt --> ttt)
                   |join (ttt as Type(@{type_name "list"},_)) 
                         = Const (@{const_name "List.append"}, ttt --> ttt --> ttt)
                   |join _ = error("implicit fusion operation not defined for attribute: "^ lhs)
                 (* could be extended to bool, map, multisets, ... *)
                val rhs' = instantiate_term tyenv' (generalize_term rhs)
                val rhs'' = DOF_core.transduce_term_global (rhs',pos) thy                 
             in case opr of 
                  "=" => Const(lnu,lnut) $ Abs ("uu_", lnt, rhs'') $ term
                | ":=" => Const(lnu,lnut) $ Abs ("uu_", lnt, rhs'') $ term
                | "+=" => Const(lnu,lnut) $ Abs ("uu_", lnt, join lnt $ (Bound 0) $ rhs'') $ term
                | _ => error "corrupted syntax - oops - this should not occur" 
             end   
     in Sign.certify_term thy  (fold read_assn S term) end

fun msg thy txt = if Config.get_global thy DOF_core.strict_monitor_checking
                  then error txt
                  else warning txt 

fun register_oid_cid_in_open_monitors oid pos cid_long thy = 
      let val {monitor_tab,...} = DOF_core.get_data_global thy
          fun is_enabled (n, info) = 
                         if exists (DOF_core.is_subclass_global thy cid_long) 
                                   (DOF_core.get_accepted_cids info) 
                         then SOME n 
                         else NONE
          (* filtering those monitors with automata, whose alphabet contains the
             cid of this oid. The enabled ones were selected and moved to their successor state
             along the super-class id. The evaluation is in parallel, simulating a product
             semantics without expanding the subclass relationship. *)
          fun is_enabled_for_cid moid =
                         let val {accepted_cids, automatas, ...} = 
                                              the(Symtab.lookup monitor_tab moid)
                             val indexS= 1 upto (length automatas)
                             val indexed_autoS = automatas ~~ indexS
                             fun check_for_cid (A,n) = 
                                   let val accS = (RegExpInterface.enabled A accepted_cids)
                                       val is_subclass = DOF_core.is_subclass_global thy
                                       val idx = find_index (is_subclass cid_long) accS
                                   in  if idx < 0 
                                       then (msg thy ("monitor "^moid^"(" ^ Int.toString n 
                                                       ^") not enabled for doc_class: "^cid_long);A)
                                       else RegExpInterface.next A accepted_cids (nth accS idx)
                                   end
                         in (moid,map check_for_cid indexed_autoS)  end  
          val enabled_monitors = List.mapPartial is_enabled (Symtab.dest monitor_tab)
          fun conv_attrs (((lhs, pos), opn), rhs) = (markup2string lhs,pos,opn, 
                                                     Syntax.read_term_global thy rhs)
          val trace_attr = [((("trace", @{here}), "+="), "[("^cid_long^", ''"^oid^"'')]")]
          val assns' = map conv_attrs trace_attr
          fun cid_of oid = #cid(the(DOF_core.get_object_global oid thy))
          fun def_trans oid = #1 o (calc_update_term thy (cid_of oid) assns')
          val _ = if null enabled_monitors then () else writeln "registrating in monitors ..." 
          val _ = app (fn n => writeln(oid^" : "^cid_long^" ==> "^n)) enabled_monitors;
           (* check that any transition is possible : *)
          fun inst_class_inv x = DOF_core.get_class_invariant(cid_of x) thy x {is_monitor=false}
          fun class_inv_checks ctxt = map (fn x => inst_class_inv x ctxt) enabled_monitors
          val delta_autoS = map is_enabled_for_cid enabled_monitors; 
          fun update_info (n, aS) (tab: DOF_core.monitor_tab) =  
                         let val {accepted_cids,rejected_cids,...} = the(Symtab.lookup tab n)
                         in Symtab.update(n, {accepted_cids=accepted_cids, 
                                              rejected_cids=rejected_cids,
                                              automatas=aS}) tab end
          fun update_trace mon_oid = DOF_core.update_value_global mon_oid (def_trans mon_oid)
          val update_automatons    = DOF_core.upd_monitor_tabs(fold update_info delta_autoS)
      in  thy |> (* update traces of all enabled monitors *)
                 fold (update_trace) (enabled_monitors)
              |> (* check class invariants of enabled monitors *)
                 (fn thy => (class_inv_checks (Context.Theory thy); thy))
              |> (* update the automata of enabled monitors *)
                 DOF_core.map_data_global(update_automatons)
      end


fun create_and_check_docitem is_monitor {is_inline=is_inline} oid pos cid_pos doc_attrs thy = 
      let val id = serial ();
          val _ = Position.report pos (docref_markup true oid id pos);
          (* creates a markup label for this position and reports it to the PIDE framework;
           this label is used as jump-target for point-and-click feature. *)
          val cid_long = check_classref is_monitor cid_pos thy
          val defaults_init = base_default_term  cid_long thy     
          fun conv (na, _(*ty*), term) = (Binding.name_of na, Binding.pos_of na, "=", term);
          val S = map conv (DOF_core.get_attribute_defaults cid_long thy);
          val (defaults, _(*ty*), _) = calc_update_term thy cid_long S defaults_init;
          fun conv_attrs ((lhs, pos), rhs) = (markup2string lhs,pos,"=", Syntax.read_term_global thy rhs)
          val assns' = map conv_attrs doc_attrs
          val (value_term, _(*ty*), _) = calc_update_term thy cid_long assns' defaults 
          val check_inv =   (DOF_core.get_class_invariant cid_long thy oid is_monitor) 
                            o Context.Theory 
      in  thy |> DOF_core.define_object_global (oid, {pos      = pos, 
                                                      thy_name = Context.theory_name thy,
                                                      value    = value_term,
                                                      inline   = is_inline,
                                                      id       = id,   
                                                      cid      = cid_long})
              |> register_oid_cid_in_open_monitors oid pos cid_long
              |> (fn thy => (check_inv thy; thy))
      end



fun update_instance_command  (((oid:string,pos),cid_pos),
                              doc_attrs: (((string*Position.T)*string)*string)list) thy
            : theory = 
            let val cid = case DOF_core.get_object_global oid thy of 
                               SOME{pos=pos_decl,cid,id,...} => 
                                   let val markup = docref_markup false oid id pos_decl;
                                       val ctxt = Proof_Context.init_global thy;
                                       val _ = Context_Position.report ctxt pos markup;
                                   in  cid end
                             | NONE => error("undefined doc_class.")
                val cid_long = check_classref {is_monitor = false} cid_pos thy
                val _ = if cid_long = DOF_core.default_cid  orelse cid = cid_long 
                        then () 
                        else error("incompatible classes:"^cid^":"^cid_long)
         
                fun conv_attrs (((lhs, pos), opn), rhs) = ((markup2string lhs),pos,opn, 
                                                           Syntax.read_term_global thy rhs)
                val assns' = map conv_attrs doc_attrs
                val def_trans  = (#1 o (calc_update_term thy cid_long assns'))
                fun check_inv thy =((DOF_core.get_class_invariant cid_long thy oid {is_monitor=false} 
                                     o Context.Theory ) thy ;
                                    thy)
            in     
                thy |> DOF_core.update_value_global oid (def_trans)
                    |> check_inv
            end


(* old version :
fun gen_enriched_document_command {inline=is_inline} cid_transform attr_transform 
                                  markdown  
                                  (((((oid,pos),cid_pos), doc_attrs) : meta_args_t,
                                     xstring_opt:(xstring * Position.T) option),
                                    toks:Input.source) 
                                  : theory -> theory =
  let  val toplvl = Toplevel.theory_toplevel
       fun check thy = let val ctxt = Toplevel.presentation_context (toplvl thy);
                           val pos = Input.pos_of toks;
                           val _   = Context_Position.reports ctxt
                                           [(pos, Markup.language_document(Input.is_delimited toks)),
                                            (pos, Markup.plain_text)];
                       in thy end
       
  in   
       (* ... level-attribute information management *)
       (   create_and_check_docitem {is_monitor=false}
                                    {is_inline=is_inline} 
                                    oid pos (cid_transform cid_pos) 
                                    (attr_transform doc_attrs) 
       (* checking and markup generation *)
        #> check ) 
       (* Thanks Frederic Tuong for the hints concerning toplevel ! ! ! *)
  end;
*)

fun gen_enriched_document_command {inline=is_inline} cid_transform attr_transform 
                                  markdown  
                                  (((((oid,pos),cid_pos), doc_attrs) : meta_args_t,
                                     xstring_opt:(xstring * Position.T) option),
                                    toks:Input.source) 
                                  : theory -> theory =
  let  val toplvl = Toplevel.theory_toplevel

       (* as side-effect, generates markup *)
       fun check_n_tex_text thy = let val ctxt = Toplevel.presentation_context (toplvl thy);
                                      val pos = Input.pos_of toks;
                                      val _ =   Context_Position.reports ctxt
                                                [(pos, Markup.language_document (Input.is_delimited toks)),
                                                 (pos, Markup.plain_text)];

                                      val text = Thy_Output.output_document 
                                                                 (Proof_Context.init_global thy) 
                                                                 markdown toks

                                  (*    val file = {path = Path.make [oid ^ "_snippet.tex"],
                                                  pos = @{here}, 
                                                  content = Latex.output_text text}
 
                                        val _ = Generated_Files.write_file (Path.make ["latex_test"]) 
                                                                         file
                                      val _ = writeln (Latex.output_text text) *)
                                  in  thy end
       
       (* ... generating the level-attribute syntax *)
  in   
       (* ... level-attribute information management *)
       (   create_and_check_docitem 
                              {is_monitor = false} {is_inline = is_inline} 
                              oid pos (cid_transform cid_pos) (attr_transform doc_attrs)
       (* checking and markup generation *)
        #>  check_n_tex_text ) 
       (* Thanks Frederic Tuong for the hints concerning toplevel ! ! ! *)
  end;



(* General criticism : attributes like "level" were treated here in the kernel instead of dragging
   them out into the COL -- bu *)

fun open_monitor_command  ((((oid,pos),cid_pos), doc_attrs) : meta_args_t) =
    let fun o_m_c oid pos cid_pos doc_attrs thy = create_and_check_docitem 
                                                         {is_monitor=true}  (* this is a monitor *)
                                                         {is_inline=false} (* monitors are always inline *)                                                               
                                                         oid pos cid_pos doc_attrs thy
        fun compute_enabled_set cid thy = 
                     case DOF_core.get_doc_class_global cid thy of
                       SOME X => let val ralph = RegExpInterface.alphabet (#rejectS X)
                                     val alph = RegExpInterface.ext_alphabet ralph (#rex X)
                                 in  (alph, map (RegExpInterface.rexp_term2da alph)(#rex X)) end 
                     | NONE => error("Internal error: class id undefined. ");
        
        fun create_monitor_entry thy =  
            let val {cid, ...} = the(DOF_core.get_object_global oid thy)
                val (S, aS) = compute_enabled_set cid thy
                val info = {accepted_cids = S, rejected_cids = [], automatas  = aS }
            in  DOF_core.map_data_global(DOF_core.upd_monitor_tabs(Symtab.update(oid, info )))(thy)
            end
    in
        o_m_c oid pos cid_pos doc_attrs  #> create_monitor_entry  
    end;


fun close_monitor_command (args as (((oid:string,pos),cid_pos),
                                    doc_attrs: (((string*Position.T)*string)*string)list)) thy = 
    let val {monitor_tab,...} = DOF_core.get_data_global thy
        fun check_if_final aS = let val i = find_index (not o RegExpInterface.final) aS
                                in  if i >= 0 
                                    then msg thy ("monitor number "^Int.toString i^
                                                   " not in final state.")
                                    else ()
                                end
        val _ =  case Symtab.lookup monitor_tab oid of
                     SOME {automatas,...} => check_if_final automatas 
                  |  NONE => error ("Not belonging to a monitor class: "^oid)
        val delete_monitor_entry = DOF_core.map_data_global (DOF_core.upd_monitor_tabs (Symtab.delete oid))
        val {cid=cid_long, id, ...} = the(DOF_core.get_object_global oid thy)
        val markup = docref_markup false oid id pos;
        val _ = Context_Position.report (Proof_Context.init_global thy) pos markup;
        val check_inv =   (DOF_core.get_class_invariant cid_long thy oid) {is_monitor=true} 
                           o Context.Theory 
    in  thy |> update_instance_command args
            |> (fn thy => (check_inv thy; thy))
            |> delete_monitor_entry
    end 

(* Core Command Definitions *)


val _ =
  Outer_Syntax.command @{command_keyword "open_monitor*"} 
                       "open a document reference monitor"
                       (attributes >> (Toplevel.theory o open_monitor_command));

val _ =
  Outer_Syntax.command @{command_keyword "close_monitor*"} 
                       "close a document reference monitor"
                       (attributes_upd >> (Toplevel.theory o close_monitor_command)); 


val _ =
  Outer_Syntax.command @{command_keyword "update_instance*"} 
                       "update meta-attributes of an instance of a document class"
                        (attributes_upd >> (Toplevel.theory o update_instance_command)); 


val _ =
  Outer_Syntax.command ("text*", @{here}) "formal comment (primary style)"
    (attributes -- Parse.opt_target -- Parse.document_source 
      >> (Toplevel.theory o (gen_enriched_document_command {inline=true} 
                                                           I I {markdown = true} )));

(* This is just a stub at present *)
val _ =
  Outer_Syntax.command ("text-macro*", @{here}) "formal comment macro"
    (attributes -- Parse.opt_target -- Parse.document_source 
      >> (Toplevel.theory o (gen_enriched_document_command {inline=false} (* declare as macro *)
                                                           I I {markdown = true} )));

val _ =
  Outer_Syntax.command @{command_keyword "declare_reference*"} 
                       "declare document reference"
                       (attributes >> (fn (((oid,pos),cid),doc_attrs) =>  
                                      (Toplevel.theory (DOF_core.declare_object_global oid))));


end

\<close>


ML\<open>
structure ODL_LTX_Converter = 
struct

fun meta_args_2_string thy ((((lab, _), cid_opt), attr_list) : ODL_Command_Parser.meta_args_t) = 
    (* for the moment naive, i.e. without textual normalization of 
       attribute names and adapted term printing *)
    let val l   = "label = "^ (enclose "{" "}" lab)
        val cid_long = case cid_opt of
                                NONE => DOF_core.default_cid
                              | SOME(cid,_) => DOF_core.parse_cid_global thy cid        
        val cid_txt  = "type = " ^ (enclose "{" "}" cid_long);

        fun ltx_of_term _ _ (Const ("List.list.Cons", @{typ "char \<Rightarrow> char list \<Rightarrow> char list"}) $ t1 $ t2) 
                  = HOLogic.dest_string (Const ("List.list.Cons", @{typ "char \<Rightarrow> char list \<Rightarrow> char list"}) $ t1 $  t2)
          | ltx_of_term _ _ (Const ("List.list.Nil", _)) = ""
          | ltx_of_term _ _ (@{term "numeral :: _ \<Rightarrow> _"} $ t) = Int.toString(HOLogic.dest_numeral t)
          | ltx_of_term ctx encl ((Const ("List.list.Cons", _) $ t1) $ t2) = 
                                               let val inner = (case t2 of 
                                                                  Const ("List.list.Nil", _) =>  (ltx_of_term ctx true t1) 
                                                                | _ => ((ltx_of_term ctx false t1)^", " ^(ltx_of_term ctx false t2))
                                                             )
                                               in if encl then enclose "{" "}" inner else inner end
          | ltx_of_term _ _ (Const ("Option.option.None", _)) = ""
          | ltx_of_term ctxt _ (Const ("Option.option.Some", _)$t) = ltx_of_term ctxt true t
          | ltx_of_term ctxt _ t = ""^(Sledgehammer_Util.hackish_string_of_term ctxt t)


        fun ltx_of_term_dbg ctx encl term  = let 
              val t_str = ML_Syntax.print_term term  
                          handle (TERM _) => "Exception TERM in ltx_of_term_dbg (print_term)"
              val ltx = ltx_of_term ctx encl term
              val _ = writeln("<STRING>"^(Sledgehammer_Util.hackish_string_of_term ctx term)^"</STRING>")
              val _ = writeln("<LTX>"^ltx^"</LTX>")
              val _ = writeln("<TERM>"^t_str^"</TERM>")
            in ltx end 


        fun markup2string s = String.concat (List.filter (fn c => c <> Symbol.DEL) 
                                            (Symbol.explode (YXML.content_of s)))
        fun ltx_of_markup ctxt s = let
  	                            val term = (Syntax.check_term ctxt o Syntax.parse_term ctxt) s
                                val str_of_term = ltx_of_term  ctxt true term 
                                    handle _ => "Exception in ltx_of_term"
                              in
                                str_of_term
                              end 
        fun toLong n =  #long_name(the(DOF_core.get_attribute_info cid_long (markup2string n) thy))

        val ctxt = Proof_Context.init_global thy
        val actual_args =  map (fn ((lhs,_),rhs) => (toLong lhs, ltx_of_markup ctxt rhs))
                               attr_list  
	      val default_args = map (fn (b,_,t) => (toLong (Long_Name.base_name ( Sign.full_name thy b)), 
                                                       ltx_of_term ctxt true t))
                               (DOF_core.get_attribute_defaults cid_long thy)

        val default_args_filtered = filter (fn (a,_) => not (exists (fn b => b = a) 
                                    (map (fn (c,_) => c) actual_args))) default_args
        val str_args = map (fn (lhs,rhs) => lhs^" = "^(enclose "{" "}" rhs)) 
                      (actual_args@default_args_filtered)
        val label_and_type = String.concat [ l, ",", cid_txt]
        val str_args = label_and_type::str_args
    in
      (enclose "[" "]" (String.concat [ label_and_type, ", args={", (commas str_args), "}"])) 
end
(* the following 2 lines set parser and converter for LaTeX generation of meta-attributes. 
   Currently of *all* commands, no distinction between text* and text command. 
   This code depends on a MODIFIED Isabelle2017 version resulting from applying the files
   under src/patches. 
 *)
(* REMARK PORT 2018 : transmission of meta-args to LaTeX crude and untested. Can be found in
   present_token. *)


end
\<close>
ML\<open> (* Setting in thy_output.ML a parser for the syntactic handling of the meta-informations of 
       text elements - so text*[m<meta-info>]\<open> ... dfgdfg .... \<close> *)
                 
val _ = Thy_Output.set_meta_args_parser
            (fn thy => (Scan.optional (Document_Source.improper 
                                       |--   ODL_Command_Parser.attributes 
                                       >>    ODL_LTX_Converter.meta_args_2_string thy) "")); \<close>



ML \<open>
local (* dull and dangerous copy from Pure.thy given that these functions are not
         globally exported. *)

val long_keyword =
  Parse_Spec.includes >> K "" ||
  Parse_Spec.long_statement_keyword;

val long_statement =
  Scan.optional (Parse_Spec.opt_thm_name ":" --| Scan.ahead long_keyword) Binding.empty_atts --
  Scan.optional Parse_Spec.includes [] -- Parse_Spec.long_statement
    >> (fn ((binding, includes), (elems, concl)) => (true, binding, includes, elems, concl));

val short_statement =
  Parse_Spec.statement -- Parse_Spec.if_statement -- Parse.for_fixes
    >> (fn ((shows, assumes), fixes) =>
      (false, Binding.empty_atts, [], [Element.Fixes fixes, Element.Assumes assumes],
        Element.Shows shows));

fun theorem spec schematic descr  =
  Outer_Syntax.local_theory_to_proof' spec ("state " ^ descr)
    ((ODL_Command_Parser.attributes -- (long_statement || short_statement)) 
    >> (fn (_ (* skip *) ,(long, binding, includes, elems, concl)) =>
           ((if schematic then Specification.schematic_theorem_cmd 
                          else Specification.theorem_cmd )
             long Thm.theoremK NONE (K I) binding includes elems concl)));

in

(* Half - fake. activates original Isar commands, but skips meta-arguments for the moment. *)
(* tendance deprecated - see new scholarly paper setup. *)
val _ = theorem @{command_keyword "theorem*"}        false "theorem";
val _ = theorem @{command_keyword "lemma*"}          false "lemma";
val _ = theorem @{command_keyword "corrollary*"}     false "corollary";
val _ = theorem @{command_keyword "proposition*"}    false "proposition";

end\<close>  

 
section\<open> Syntax for Ontological Antiquotations (the '' View'' Part II) \<close>

ML\<open>
structure OntoLinkParser = 
struct

val basic_entity = Thy_Output.antiquotation_pretty_source
    : binding -> 'a context_parser -> (Proof.context -> 'a -> Pretty.T) -> theory -> theory;

fun check_and_mark ctxt cid_decl (str:{strict_checking: bool}) {inline=inline_req} pos name  =
  let
    val thy = Proof_Context.theory_of ctxt;
  in 
    if DOF_core.is_defined_oid_global name thy 
    then let val {pos=pos_decl,id,cid,inline,...} = the(DOF_core.get_object_global name thy)
             val _ = if not inline_req 
                     then if inline then () else error("referred text-element is macro! (try option display)")
                     else if not inline then () else error("referred text-element is no macro!")
             val markup = docref_markup false name id pos_decl;
             val _ = Context_Position.report ctxt pos markup;
                     (* this sends a report for a ref application to the PIDE interface ... *) 
             val _ = if cid <> DOF_core.default_cid 
                        andalso not(DOF_core.is_subclass ctxt cid cid_decl)
                     then error("reference ontologically inconsistent:" ^ Position.here pos_decl)
                     else ()
         in () end
    else if   DOF_core.is_declared_oid_global name thy 
         then (if #strict_checking str 
               then warning("declared but undefined document reference: "^name) 
               else ())
         else error("undefined document reference: "^name)
  end

val _ =  check_and_mark : Proof.context ->  string ->  
                          {strict_checking: bool} -> {inline:bool} ->
                          Position.T -> Symtab.key -> unit

(* generic syntax for doc_class links. *) 

val defineN    = "define"
val uncheckedN = "unchecked" 

val docitem_modes = Scan.optional (Args.parens (Args.$$$ defineN || Args.$$$ uncheckedN) 
                                   >> (fn str => if str = defineN 
                                                 then {unchecked = false, define= true}  
                                                 else {unchecked = true,  define= false})) 
                                   {unchecked = false, define= false} (* default *);


val docitem_antiquotation_parser = (Scan.lift (docitem_modes -- Args.text_input))
                                   : ({define:bool,unchecked:bool} * Input.source) context_parser;


fun pretty_docitem_antiquotation_generic cid_decl ctxt ({unchecked, define}, src ) = 
    let val (str,pos) = Input.source_content src
        val inline = Config.get ctxt Document_Antiquotation.thy_output_display
        val _ = check_and_mark ctxt cid_decl {strict_checking = not unchecked} 
                                             {inline = inline} pos str
        val enc = Latex.enclose_block
    in  
        (case (define,inline) of
            (true,false) => enc("\\csname isaDof.label\\endcsname[type={"^cid_decl^"}]   {")"}" 
           |(false,false)=> enc("\\csname isaDof.ref\\endcsname[type={"^cid_decl^"}]     {")"}"
           |(true,true)  => enc("\\csname isaDof.macroDef\\endcsname[type={"^cid_decl^"}]{")"}" 
           |(false,true) => enc("\\csname isaDof.macroExp\\endcsname[type={"^cid_decl^"}]{")"}"
        )
        [Latex.text (Input.source_content src)] 
    end      


fun docitem_antiquotation bind cid = 
    Thy_Output.antiquotation_raw bind  docitem_antiquotation_parser 
                                       (pretty_docitem_antiquotation_generic cid);


fun check_and_mark_term ctxt oid  =
  let val thy = Context.theory_of ctxt;
  in  if DOF_core.is_defined_oid_global oid thy 
      then let val {pos=pos_decl,id,cid,value,...} = the(DOF_core.get_object_global oid thy)
               val markup = docref_markup false oid id pos_decl;
               val _ = Context_Position.report_generic ctxt pos_decl markup;
                       (* this sends a report for a ref application to the PIDE interface ... *) 
               val _ = if cid = DOF_core.default_cid
                       then error("anonymous "^ DOF_core.default_cid ^ " class has no value" )
                       else ()
           in  value end
      else error("undefined document reference:"^oid)
  end
                 
                                         
fun ML_antiquotation_docitem_value (ctxt, toks) = 
    (Scan.lift (Args.cartouche_input) 
     >> (fn inp => (ML_Syntax.atomic o ML_Syntax.print_term) 
                   ((check_and_mark_term ctxt o fst o Input.source_content) inp)))
     (ctxt, toks)

(* Setup for general docitems of the global DOF_core.default_cid - class ("text")*)
val _ = Theory.setup
           (docitem_antiquotation   \<^binding>\<open>docitem\<close>  DOF_core.default_cid #>
            
            ML_Antiquotation.inline \<^binding>\<open>docitem_value\<close> ML_antiquotation_docitem_value)

end (* struct *)
\<close>

text\<open> @{thm [] refl}\<close>

ML\<open> 
structure AttributeAccess = 
struct

val basic_entity = Thy_Output.antiquotation_pretty_source 
    : binding -> 'a context_parser -> (Proof.context -> 'a -> Pretty.T) -> theory -> theory;

fun symbex_attr_access0 ctxt proj_term term =
    (* term assumed to be ground type, (f term) not necessarily *)
    let val [subterm'] = Type_Infer_Context.infer_types ctxt [proj_term $ term]
        val ty = type_of (subterm')
        (* Debug :
        val _ = writeln ("calculate_attr_access raw term: " 
                         ^ Syntax.string_of_term ctxt subterm')
         *)
        val term' = (Const(@{const_name "HOL.eq"}, ty --> ty --> HOLogic.boolT) 
                              $ subterm' 
                              $ Free("_XXXXXXX", ty))
        val thm = simplify ctxt (Thm.assume(Thm.cterm_of ctxt (HOLogic.mk_Trueprop term')));
    in  case HOLogic.dest_Trueprop (Thm.concl_of thm) of
           Free("_XXXXXXX", @{typ "bool"}) => @{const "True"}
        |  @{const "HOL.Not"} $  Free("_XXXXXXX", @{typ "bool"}) =>  @{const "False"}
        |  Const(@{const_name "HOL.eq"},_) $ lhs $ Free("_XXXXXXX", _ )=> lhs 
        |  Const(@{const_name "HOL.eq"},_) $ Free("_XXXXXXX", _ ) $ rhs => rhs
        |  _ => error ("could not reduce attribute term: " ^
                       Syntax.string_of_term ctxt subterm')
    end

fun compute_attr_access ctxt attr oid pos pos' = (* template *)
    case DOF_core.get_value_global oid (Context.theory_of ctxt) of 
            SOME term => let val ctxt =  (Proof_Context.init_global (Context.theory_of ctxt))
                              val SOME{cid,pos=pos_decl,id,...} = DOF_core.get_object_local oid ctxt
                              val markup = docref_markup false oid id pos_decl;
                              val _ = Context_Position.report ctxt pos' markup;
                              val (* (long_cid, attr_b,ty) = *)
                                  {long_name, typ=ty,...} = 
                                       case DOF_core.get_attribute_info_local cid attr ctxt of
                                            SOME f => f
                                          | NONE => error("attribute undefined for reference: "
                                                          ^ oid ^ Position.here pos)
                              val proj_term = Const(long_name,dummyT --> ty) 
                          in  symbex_attr_access0 ctxt proj_term term end
           | NONE => error("identifier not a docitem reference" ^ Position.here pos)


fun compute_trace_ML ctxt oid pos pos' =
    (* grabs attribute, and converts its HOL-term into (textual) ML representation *)
    let val term = compute_attr_access ctxt "trace" oid pos pos'
        fun conv (Const(@{const_name "Pair"},_) $ Const(s,_) $ S) = (s, HOLogic.dest_string S)
    in  map conv (HOLogic.dest_list term) end

val parse_oid = Scan.lift(Parse.position Args.name) 
val parse_cid = Scan.lift(Parse.position Args.name) 
val parse_oid' = Term_Style.parse -- parse_oid
val parse_cid' = Term_Style.parse -- parse_cid

val parse_attribute_access = (parse_oid
                              --| (Scan.lift @{keyword "::"}) 
                              -- Scan.lift (Parse.position Args.name))
                              : ((string *Position.T) * (string * Position.T)) context_parser 

val parse_attribute_access' = Term_Style.parse -- parse_attribute_access
                              : ((term -> term) *
                                 ((string * Position.T) * (string * Position.T))) context_parser

fun attr_2_ML ctxt ((attr:string,pos),(oid:string,pos')) = (ML_Syntax.atomic o ML_Syntax.print_term) 
                                                           (compute_attr_access ctxt attr oid pos pos') 

fun trace_attr_2_ML ctxt (oid:string,pos) =
    let val print_string_pair = ML_Syntax.print_pair  ML_Syntax.print_string ML_Syntax.print_string
        val toML = (ML_Syntax.atomic o (ML_Syntax.print_list print_string_pair))
    in  toML (compute_trace_ML ctxt oid @{here} pos) end

fun compute_cid_repr ctxt cid pos = 
      if DOF_core.is_defined_cid_local  cid ctxt then Const(cid,dummyT)
      else ISA_core.err "Undefined Class Id" pos

local

fun pretty_attr_access_style ctxt (style, ((oid,pos),(attr,pos'))) = 
           Thy_Output.pretty_term ctxt (style (compute_attr_access (Context.Proof ctxt) 
                                                                    attr oid pos pos'));
fun pretty_trace_style ctxt (style, (oid,pos)) = 
          Thy_Output.pretty_term ctxt (style (compute_attr_access  (Context.Proof ctxt) 
                                                                   "trace" oid pos pos));
fun pretty_cid_style ctxt (style, (cid,pos)) = 
          Thy_Output.pretty_term ctxt (style (compute_cid_repr ctxt cid pos));

in
val _ = Theory.setup 
           (ML_Antiquotation.inline  \<^binding>\<open>docitem_attribute\<close> 
               (fn (ctxt,toks) => (parse_attribute_access >>  attr_2_ML ctxt) (ctxt, toks))  #>
            ML_Antiquotation.inline  \<^binding>\<open>trace_attribute\<close>  
               (fn (ctxt,toks) => (parse_oid >> trace_attr_2_ML ctxt) (ctxt, toks)) #>
            basic_entity  \<^binding>\<open>trace_attribute\<close>  parse_oid'  pretty_trace_style #>
            basic_entity  \<^binding>\<open>doc_class\<close>  parse_cid'  pretty_cid_style #>
            basic_entity  \<^binding>\<open>docitem_attribute\<close>  parse_attribute_access' pretty_attr_access_style
           )
end
end
\<close>

text\<open> Note that the functions \<^verbatim>\<open>basic_entities\<close> and \<^verbatim>\<open>basic_entity\<close> in 
      @{ML_structure AttributeAccess} are copied from 
      @{file "$ISABELLE_HOME/src/Pure/Thy/thy_output.ML"} \<close>


section\<open> Syntax for Ontologies (the '' View'' Part III) \<close> 
ML\<open>
structure OntoParser = 
struct

fun read_parent NONE ctxt = (NONE, ctxt)
  | read_parent (SOME raw_T) ctxt =
      (case Proof_Context.read_typ_abbrev ctxt raw_T of
        Type (name, Ts) => (SOME (Ts, name), fold Variable.declare_typ Ts ctxt)
      | T => error ("Bad parent record specification: " ^ Syntax.string_of_typ ctxt T));




fun read_fields raw_fields ctxt =
    let
      val Ts = Syntax.read_typs ctxt (map (fn ((_, raw_T, _),_) => raw_T) raw_fields);
      val terms = map ((map_option (Syntax.read_term ctxt)) o snd) raw_fields
      fun test t1 t2 = Sign.typ_instance (Proof_Context.theory_of ctxt)
                                         (t1, ODL_Command_Parser.generalize_typ 0 t2) 
      fun check_default (ty,SOME trm) = 
                  let val ty' = (type_of trm)
                  in if test ty ty' 
                     then ()
                     else error("type mismatch:"^ 
                                (Syntax.string_of_typ ctxt ty')^":"^ 
                                (Syntax.string_of_typ ctxt ty))
                  end
                                                   (* BAD STYLE : better would be catching exn. *) 
         |check_default (_,_) = ()  
      val fields = map2 (fn ((x, _, mx),_) => fn T => (x, T, mx)) raw_fields Ts;
      val _ = map check_default (Ts ~~ terms) (* checking types conform to defaults *) 
      val ctxt' = fold Variable.declare_typ Ts ctxt;
    in (fields, terms, ctxt') end;


val tag_attr = (Binding.make("tag_attribute",@{here}), @{typ "int"},Mixfix.NoSyn)
val trace_attr = ((Binding.make("trace",@{here}), "(doc_class rexp \<times> string) list",Mixfix.NoSyn),
                  SOME "[]"): ((binding * string * mixfix) * string option)

fun def_cmd (decl, spec, prems, params) = #2 oo Specification.definition' decl params prems spec
fun meta_eq_const T = Const (\<^const_name>\<open>Pure.eq\<close>, T --> T --> propT);
fun mk_meta_eq (t, u) = meta_eq_const (fastype_of t) $ t $ u;

fun define_cond binding f_sty   cond_suffix read_cond (ctxt:local_theory) = 
       let val bdg = Binding.suffix_name cond_suffix binding
           val eq =  mk_meta_eq(Free(Binding.name_of bdg, f_sty),read_cond ctxt)
           val args = (SOME(bdg,NONE,NoSyn), (Binding.empty_atts,eq),[],[]) 
       in def_cmd args true ctxt end

fun define_inv cid_long ((lbl, pos), inv) thy = 
    let val bdg = (* Binding.suffix_name cid_long *) (Binding.make (lbl,pos))
        fun inv_term ctxt = Syntax.read_term ctxt inv
        val inv_ty = (Syntax.read_typ_global thy cid_long) --> HOLogic.boolT
    in  thy |> Named_Target.theory_map (define_cond bdg inv_ty "_inv" inv_term) end

fun add_doc_class_cmd overloaded (raw_params, binding) 
                      raw_parent raw_fieldsNdefaults reject_Atoms regexps invariants thy =
    let
      val ctxt = Proof_Context.init_global thy;
      val params = map (apsnd (Typedecl.read_constraint ctxt)) raw_params;
      val ctxt1 = fold (Variable.declare_typ o TFree) params ctxt;
      fun cid thy = DOF_core.parse_cid_global thy (Binding.name_of binding)    
      val (parent, ctxt2) = read_parent raw_parent ctxt1;
      val parent_cid_long =  map_optional snd DOF_core.default_cid parent;
      (* takes class synonyms into account *) 
      val parent' = map_option (map_snd (K (DOF_core.read_cid_global thy parent_cid_long))) parent
      val raw_fieldsNdefaults' = filter (fn((bi,_,_),_) => Binding.name_of bi <> "trace") 
                                        raw_fieldsNdefaults
      val _ = if length raw_fieldsNdefaults' <> length raw_fieldsNdefaults 
              then warning("re-declaration of trace attribute in monitor --- ignored")
              else ()
      val raw_fieldsNdefaults'' = if  null regexps  
                                  then raw_fieldsNdefaults' 
                                  else trace_attr::raw_fieldsNdefaults' 
      val (fields, terms, ctxt3) = read_fields raw_fieldsNdefaults'' ctxt2;
      
      val fieldsNterms = (map (fn (a,b,_) => (a,b)) fields) ~~ terms
      val fieldsNterms' = map (fn ((x,y),z) => (x,y,z)) fieldsNterms
      val params' = map (Proof_Context.check_tfree ctxt3) params;
      fun check_n_filter thy (bind,ty,mf) = 
                     case  DOF_core.get_attribute_info parent_cid_long (Binding.name_of bind) thy of
                           NONE => (* no prior declaration *) SOME(bind,ty,mf)
                         | SOME{def_occurrence,long_name,typ,...} => if ty = typ 
                                                   then (warning("overriding attribute:"^long_name^
                                                                 " in doc class:" ^ def_occurrence);
                                                        SOME(bind,ty,mf))
                                                   else error("no overloading allowed.")
      val _ = map_filter (check_n_filter thy) fields


    in thy |> Record.add_record overloaded (params', binding) parent' (tag_attr::fields)
           |> (Sign.add_consts_cmd [(binding,  "doc_class Regular_Exp.rexp", Mixfix.NoSyn)])
           |> DOF_core.define_doc_class_global (params', binding) parent fieldsNterms' regexps 
                                                                  reject_Atoms invariants
              (* adding const symbol representing doc-class for Monitor-RegExps.*)
           |> (fn thy => OntoLinkParser.docitem_antiquotation binding (cid thy) thy)
              (* defines the ontology-checked text antiquotation to this document class *)
           |> (fn thy => fold(define_inv (cid thy)) (invariants) thy)
    end;
           
val parse_invariants = Parse.and_list (Args.name_position --| Parse.$$$ "::" -- Parse.term)

val _ =
  Outer_Syntax.command \<^command_keyword>\<open>doc_class\<close> "define document class"
    ((Parse_Spec.overloaded 
      -- (Parse.type_args_constrained  -- Parse.binding) 
      -- (\<^keyword>\<open>=\<close>  
         |-- Scan.option (Parse.typ --| \<^keyword>\<open>+\<close>) 
          -- Scan.repeat1 (Parse.const_binding -- Scan.option (\<^keyword>\<open><=\<close> |-- Parse.term))
          )
      -- (   Scan.optional (\<^keyword>\<open>rejects\<close>    |-- Parse.enum1 "," Parse.term) []
          -- Scan.repeat   (\<^keyword>\<open>accepts\<close>    |-- Parse.term)
          -- Scan.repeats ((\<^keyword>\<open>invariant\<close>) |-- parse_invariants))
     ) 
    >> (fn (((overloaded, hdr), (parent, attrs)),((rejects,accept_rex),invars)) =>
           Toplevel.theory (add_doc_class_cmd {overloaded = overloaded} hdr parent  
                                              attrs rejects accept_rex invars)));

end (* struct *)
\<close>  

text\<open>dfgd\<close>
(*
ML\<open>
   Pretty.text;
   Pretty.str;
   Pretty.block_enclose;
   theory_text_antiquotation in Document_Antiquotations (not exported)
\<close>

ML\<open>Pretty.text_fold; Pretty.unformatted_string_of\<close>
ML\<open> (String.concatWith ","); Token.content_of\<close>


ML\<open>
 Document.state;
Session.get_keywords();
 Parse.command;
 Parse.tags;
\<close>
ML\<open>
 Outer_Syntax.print_commands @{theory};
 Outer_Syntax.parse_spans;
 Parse.!!!;

\<close>
*)

end
