src/Pure/Isar/local_syntax.ML
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tuned basic list operators (flat, maps, map_filter);
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(*  Title:      Pure/Isar/local_syntax.ML
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    ID:         $Id$
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    Author:     Makarius
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Local syntax depending on theory syntax.
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*)
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val show_structs = ref false;
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signature LOCAL_SYNTAX =
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sig
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  type T
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  val syn_of: T -> Syntax.syntax
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  val structs_of: T -> string list
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  val init: theory -> T
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  val rebuild: theory -> T -> T
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  val add_syntax: theory -> string * bool -> (bool * (string * typ * mixfix)) list -> T -> T
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  val extern_term: T -> term -> term
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end;
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structure LocalSyntax: LOCAL_SYNTAX =
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struct
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(* datatype T *)
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type local_mixfix =
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  ((string * bool) * string list list) *          (*name, fixed?, mixfix content*)
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  ((string * bool) * (string * typ * mixfix));    (*mode, inout?, mixfix syntax*)
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datatype T = Syntax of
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 {thy_syntax: Syntax.syntax,
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  local_syntax: Syntax.syntax,
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  mixfixes: local_mixfix list,
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  idents: string list * string list};
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fun make_syntax (thy_syntax, local_syntax, mixfixes, idents) =
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  Syntax {thy_syntax = thy_syntax, local_syntax = local_syntax,
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    mixfixes = mixfixes, idents = idents};
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fun map_syntax f (Syntax {thy_syntax, local_syntax, mixfixes, idents}) =
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  make_syntax (f (thy_syntax, local_syntax, mixfixes, idents));
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fun is_consistent thy (Syntax {thy_syntax, ...}) =
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  Syntax.eq_syntax (Sign.syn_of thy, thy_syntax);
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fun syn_of (Syntax {local_syntax, ...}) = local_syntax;
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fun idents_of (Syntax {idents, ...}) = idents;
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val structs_of = #1 o idents_of;
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(* build syntax *)
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fun build_syntax thy (mixfixes, idents as (structs, _)) =
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  let
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    val thy_syntax = Sign.syn_of thy;
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    val is_logtype = Sign.is_logtype thy;
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    val (atrs, trs, trs', atrs') = Syntax.struct_trfuns structs;
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    val local_syntax = thy_syntax
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      |> Syntax.extend_trfuns
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          (map Syntax.mk_trfun atrs, map Syntax.mk_trfun trs,
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           map Syntax.mk_trfun trs', map Syntax.mk_trfun atrs')
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      |> fold (uncurry (Syntax.extend_const_gram is_logtype))
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          (AList.coalesce (op =) (rev (map snd mixfixes)));
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  in make_syntax (thy_syntax, local_syntax, mixfixes, idents) end;
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fun init thy = build_syntax thy ([], ([], []));
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fun rebuild thy (syntax as Syntax {mixfixes, idents, ...}) =
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  if is_consistent thy syntax then syntax
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  else build_syntax thy (mixfixes, idents);
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(* mixfix declarations *)
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local
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fun mixfix_nosyn (_, (_, _, mx)) = mx = NoSyn;
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fun mixfix_struct (_, (_, _, mx)) = mx = Structure;
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fun mixfix_conflict ((content1: string list list, inout1), ((_, content2), ((_, inout2), _))) =
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  inout1 andalso inout2 andalso exists (fn x => exists (fn y => x = y) content2) content1;
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fun add_mixfix (mode, inout) (fixed, (x, T, mx)) =
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  let
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    val content = Syntax.mixfix_content mx;
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    val c = if fixed then Syntax.fixedN ^ x else x;
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  in
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    remove mixfix_conflict (content, inout) #>
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    cons (((x, fixed), content), ((mode, inout), (c, T, mx)))
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  end;
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fun prep_struct (fixed, (c, _, Structure)) =
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      if fixed then SOME c
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      else error ("Bad mixfix declaration for const: " ^ quote c)
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  | prep_struct _ = NONE;
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in
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fun add_syntax thy prmode raw_decls (syntax as (Syntax {mixfixes, idents = (structs, _), ...})) =
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  (case filter_out mixfix_nosyn raw_decls of
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    [] => syntax
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  | decls =>
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      let
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        val mixfixes' = mixfixes |> fold (add_mixfix prmode) (filter_out mixfix_struct decls);
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        val fixes' = fold (fn (((x, true), _), _) => cons x | _ => I) mixfixes' [];
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        val structs' = structs @ map_filter prep_struct decls;
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      in build_syntax thy (mixfixes', (structs', fixes')) end);
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end;
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(* extern_term *)
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fun extern_term syntax =
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  let
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    val (structs, fixes) = idents_of syntax;
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    fun map_free (t as Free (x, T)) =
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          let val i = Library.find_index_eq x structs + 1 in
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            if i = 0 andalso member (op =) fixes x then
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              Const (Syntax.fixedN ^ x, T)
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            else if i = 1 andalso not (! show_structs) then
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              Syntax.const "_struct" $ Syntax.const "_indexdefault"
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            else t
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          end
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      | map_free t = t;
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  in Term.map_aterms map_free end;
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end;