src/Pure/Syntax/syn_trans.ML
author wenzelm
Tue Mar 22 13:32:20 2011 +0100 (2011-03-22)
changeset 42048 afd11ca8e018
parent 42045 fda09013c496
child 42053 006095137a81
permissions -rw-r--r--
support for encoded positions (for id_position, longid_position) as pseudo type-constraints -- still inactive;
simplified/generalized abs_tr/binder_tr: allow iterated constraints, stemming from positions;
Ast.pretty_ast: special treatment of encoded positions;
eliminated Ast.str_of_ast in favour of uniform Ast.pretty_ast;
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(*  Title:      Pure/Syntax/syn_trans.ML
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    Author:     Tobias Nipkow and Markus Wenzel, TU Muenchen
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Syntax translation functions.
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*)
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signature SYN_TRANS0 =
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sig
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  val eta_contract_default: bool Unsynchronized.ref
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  val eta_contract_raw: Config.raw
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  val eta_contract: bool Config.T
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  val atomic_abs_tr': string * typ * term -> term * term
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  val preserve_binder_abs_tr': string -> string -> string * (term list -> term)
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  val preserve_binder_abs2_tr': string -> string -> string * (term list -> term)
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  val mk_binder_tr: string * string -> string * (term list -> term)
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  val mk_binder_tr': string * string -> string * (term list -> term)
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  val dependent_tr': string * string -> term list -> term
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  val antiquote_tr: string -> term -> term
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  val quote_tr: string -> term -> term
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  val quote_antiquote_tr: string -> string -> string -> string * (term list -> term)
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  val antiquote_tr': string -> term -> term
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  val quote_tr': string -> term -> term
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  val quote_antiquote_tr': string -> string -> string -> string * (term list -> term)
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  val update_name_tr': term -> term
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  val mark_bound: string -> term
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  val mark_boundT: string * typ -> term
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  val bound_vars: (string * typ) list -> term -> term
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  val variant_abs: string * typ * term -> string * term
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  val variant_abs': string * typ * term -> string * term
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end;
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signature SYN_TRANS1 =
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sig
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  include SYN_TRANS0
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  val non_typed_tr': (term list -> term) -> bool -> typ -> term list -> term
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  val non_typed_tr'': ('a -> term list -> term) -> 'a -> bool -> typ -> term list -> term
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  val constrainAbsC: string
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  val pure_trfuns:
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    (string * (Ast.ast list -> Ast.ast)) list *
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    (string * (term list -> term)) list *
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    (string * (term list -> term)) list *
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    (string * (Ast.ast list -> Ast.ast)) list
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  val pure_trfunsT: (string * (bool -> typ -> term list -> term)) list
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  val struct_trfuns: string list ->
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    (string * (Ast.ast list -> Ast.ast)) list *
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    (string * (term list -> term)) list *
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    (string * (bool -> typ -> term list -> term)) list *
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    (string * (Ast.ast list -> Ast.ast)) list
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end;
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signature SYN_TRANS =
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sig
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  include SYN_TRANS1
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  val abs_tr': Proof.context -> term -> term
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  val prop_tr': term -> term
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  val appl_ast_tr': Ast.ast * Ast.ast list -> Ast.ast
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  val applC_ast_tr': Ast.ast * Ast.ast list -> Ast.ast
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  val parsetree_to_ast: Proof.context -> bool ->
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    (string -> (Proof.context -> Ast.ast list -> Ast.ast) option) -> Parser.parsetree -> Ast.ast
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  val ast_to_term: Proof.context ->
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    (string -> (Proof.context -> term list -> term) option) -> Ast.ast -> term
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end;
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structure Syn_Trans: SYN_TRANS =
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struct
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(** parse (ast) translations **)
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(* constify *)
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fun constify_ast_tr [Ast.Variable c] = Ast.Constant c
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  | constify_ast_tr asts = raise Ast.AST ("constify_ast_tr", asts);
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(* application *)
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fun appl_ast_tr [f, args] = Ast.Appl (f :: Ast.unfold_ast "_args" args)
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  | appl_ast_tr asts = raise Ast.AST ("appl_ast_tr", asts);
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fun applC_ast_tr [f, args] = Ast.Appl (f :: Ast.unfold_ast "_cargs" args)
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  | applC_ast_tr asts = raise Ast.AST ("applC_ast_tr", asts);
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(* abstraction *)
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fun idtyp_ast_tr (*"_idtyp"*) [x, ty] = Ast.Appl [Ast.Constant "_constrain", x, ty]
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  | idtyp_ast_tr (*"_idtyp"*) asts = raise Ast.AST ("idtyp_ast_tr", asts);
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fun idtypdummy_ast_tr (*"_idtypdummy"*) [ty] =
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      Ast.Appl [Ast.Constant "_constrain", Ast.Constant "_idtdummy", ty]
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  | idtypdummy_ast_tr (*"_idtypdummy"*) asts = raise Ast.AST ("idtyp_ast_tr", asts);
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fun lambda_ast_tr (*"_lambda"*) [pats, body] =
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      Ast.fold_ast_p "_abs" (Ast.unfold_ast "_pttrns" pats, body)
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  | lambda_ast_tr (*"_lambda"*) asts = raise Ast.AST ("lambda_ast_tr", asts);
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val constrainAbsC = "_constrainAbs";
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fun absfree_proper (x, T, t) =
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  if can Name.dest_internal x
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  then error ("Illegal internal variable in abstraction: " ^ quote x)
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  else Term.absfree (x, T, t);
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fun abs_tr [Free (x, T), t] = absfree_proper (x, T, t)
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  | abs_tr [Const ("_idtdummy", T), t] = Term.absdummy (T, t)
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  | abs_tr [Const ("_constrain", _) $ x $ tT, t] = Lexicon.const constrainAbsC $ abs_tr [x, t] $ tT
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  | abs_tr ts = raise TERM ("abs_tr", ts);
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(* binder *)
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fun mk_binder_tr (syn, name) =
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  let
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    fun binder_tr [Const ("_idts", _) $ idt $ idts, t] = binder_tr [idt, binder_tr [idts, t]]
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      | binder_tr [x, t] =
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          let val abs = abs_tr [x, t] handle TERM _ => raise TERM ("binder_tr", [x, t])
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          in Lexicon.const name $ abs end
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      | binder_tr ts = raise TERM ("binder_tr", ts);
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  in (syn, binder_tr) end;
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(* type propositions *)
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fun mk_type ty =
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  Lexicon.const "_constrain" $
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    Lexicon.const "\\<^const>TYPE" $ (Lexicon.const "\\<^type>itself" $ ty);
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fun ofclass_tr (*"_ofclass"*) [ty, cls] = cls $ mk_type ty
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  | ofclass_tr (*"_ofclass"*) ts = raise TERM ("ofclass_tr", ts);
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fun sort_constraint_tr (*"_sort_constraint"*) [ty] =
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      Lexicon.const "\\<^const>Pure.sort_constraint" $ mk_type ty
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  | sort_constraint_tr (*"_sort_constraint"*) ts = raise TERM ("sort_constraint_tr", ts);
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(* meta propositions *)
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fun aprop_tr (*"_aprop"*) [t] = Lexicon.const "_constrain" $ t $ Lexicon.const "\\<^type>prop"
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  | aprop_tr (*"_aprop"*) ts = raise TERM ("aprop_tr", ts);
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(* meta implication *)
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fun bigimpl_ast_tr (*"_bigimpl"*) (asts as [asms, concl]) =
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      let val prems =
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        (case Ast.unfold_ast_p "_asms" asms of
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          (asms', Ast.Appl [Ast.Constant "_asm", asm']) => asms' @ [asm']
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        | _ => raise Ast.AST ("bigimpl_ast_tr", asts))
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      in Ast.fold_ast_p "\\<^const>==>" (prems, concl) end
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  | bigimpl_ast_tr (*"_bigimpl"*) asts = raise Ast.AST ("bigimpl_ast_tr", asts);
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(* type/term reflection *)
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fun type_tr (*"_TYPE"*) [ty] = mk_type ty
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  | type_tr (*"_TYPE"*) ts = raise TERM ("type_tr", ts);
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(* dddot *)
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fun dddot_tr (*"_DDDOT"*) ts = Term.list_comb (Lexicon.var Syn_Ext.dddot_indexname, ts);
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(* quote / antiquote *)
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fun antiquote_tr name =
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  let
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    fun tr i ((t as Const (c, _)) $ u) =
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          if c = name then tr i u $ Bound i
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          else tr i t $ tr i u
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      | tr i (t $ u) = tr i t $ tr i u
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      | tr i (Abs (x, T, t)) = Abs (x, T, tr (i + 1) t)
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      | tr _ a = a;
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  in tr 0 end;
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fun quote_tr name t = Abs ("s", dummyT, antiquote_tr name (Term.incr_boundvars 1 t));
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fun quote_antiquote_tr quoteN antiquoteN name =
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  let
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    fun tr [t] = Lexicon.const name $ quote_tr antiquoteN t
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      | tr ts = raise TERM ("quote_tr", ts);
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  in (quoteN, tr) end;
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(* corresponding updates *)
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fun update_name_tr (Free (x, T) :: ts) = list_comb (Free (suffix "_update" x, T), ts)
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  | update_name_tr (Const (x, T) :: ts) = list_comb (Const (suffix "_update" x, T), ts)
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  | update_name_tr (((c as Const ("_constrain", _)) $ t $ ty) :: ts) =
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      list_comb (c $ update_name_tr [t] $
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        (Lexicon.const "\\<^type>fun" $ ty $ Lexicon.const "\\<^type>dummy"), ts)
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  | update_name_tr ts = raise TERM ("update_name_tr", ts);
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(* indexed syntax *)
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fun struct_ast_tr (*"_struct"*) [Ast.Appl [Ast.Constant "_index", ast]] = ast
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  | struct_ast_tr (*"_struct"*) asts = Ast.mk_appl (Ast.Constant "_struct") asts;
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fun index_ast_tr ast =
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  Ast.mk_appl (Ast.Constant "_index") [Ast.mk_appl (Ast.Constant "_struct") [ast]];
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fun indexdefault_ast_tr (*"_indexdefault"*) [] =
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      index_ast_tr (Ast.Constant "_indexdefault")
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  | indexdefault_ast_tr (*"_indexdefault"*) asts =
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      raise Ast.AST ("indexdefault_ast_tr", asts);
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fun indexnum_ast_tr (*"_indexnum"*) [ast] =
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      index_ast_tr (Ast.mk_appl (Ast.Constant "_indexnum") [ast])
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  | indexnum_ast_tr (*"_indexnum"*) asts = raise Ast.AST ("indexnum_ast_tr", asts);
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fun indexvar_ast_tr (*"_indexvar"*) [] =
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      Ast.mk_appl (Ast.Constant "_index") [Ast.Variable "some_index"]
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  | indexvar_ast_tr (*"_indexvar"*) asts = raise Ast.AST ("indexvar_ast_tr", asts);
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fun index_tr (*"_index"*) [t] = t
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  | index_tr (*"_index"*) ts = raise TERM ("index_tr", ts);
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(* implicit structures *)
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fun the_struct structs i =
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  if 1 <= i andalso i <= length structs then nth structs (i - 1)
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  else error ("Illegal reference to implicit structure #" ^ string_of_int i);
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fun struct_tr structs (*"_struct"*) [Const ("_indexdefault", _)] =
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      Lexicon.free (the_struct structs 1)
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  | struct_tr structs (*"_struct"*) [t as (Const ("_indexnum", _) $ Const (s, _))] =
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      Lexicon.free (the_struct structs
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        (case Lexicon.read_nat s of SOME n => n | NONE => raise TERM ("struct_tr", [t])))
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  | struct_tr _ (*"_struct"*) ts = raise TERM ("struct_tr", ts);
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(** print (ast) translations **)
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(* types *)
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fun non_typed_tr' f _ _ ts = f ts;
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fun non_typed_tr'' f x _ _ ts = f x ts;
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(* application *)
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fun appl_ast_tr' (f, []) = raise Ast.AST ("appl_ast_tr'", [f])
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  | appl_ast_tr' (f, args) = Ast.Appl [Ast.Constant "_appl", f, Ast.fold_ast "_args" args];
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fun applC_ast_tr' (f, []) = raise Ast.AST ("applC_ast_tr'", [f])
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  | applC_ast_tr' (f, args) = Ast.Appl [Ast.Constant "_applC", f, Ast.fold_ast "_cargs" args];
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(* abstraction *)
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fun mark_boundT (x, T) = Const ("_bound", T --> T) $ Free (x, T);
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fun mark_bound x = mark_boundT (x, dummyT);
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fun bound_vars vars body =
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  subst_bounds (map mark_boundT (Term.rename_wrt_term body vars), body);
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fun strip_abss vars_of body_of tm =
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  let
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    val vars = vars_of tm;
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    val body = body_of tm;
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    val rev_new_vars = Term.rename_wrt_term body vars;
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    fun subst (x, T) b =
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      if can Name.dest_internal x andalso not (Term.loose_bvar1 (b, 0))
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      then (Const ("_idtdummy", T), incr_boundvars ~1 b)
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      else (mark_boundT (x, T), Term.subst_bound (mark_bound x, b));
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    val (rev_vars', body') = fold_map subst rev_new_vars body;
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  in (rev rev_vars', body') end;
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(*do (partial) eta-contraction before printing*)
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val eta_contract_default = Unsynchronized.ref true;
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val eta_contract_raw = Config.declare "eta_contract" (fn _ => Config.Bool (! eta_contract_default));
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val eta_contract = Config.bool eta_contract_raw;
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fun eta_contr ctxt tm =
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  let
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    fun is_aprop (Const ("_aprop", _)) = true
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      | is_aprop _ = false;
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    fun eta_abs (Abs (a, T, t)) =
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          (case eta_abs t of
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            t' as f $ u =>
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              (case eta_abs u of
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                Bound 0 =>
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                  if Term.loose_bvar1 (f, 0) orelse is_aprop f then Abs (a, T, t')
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                  else  incr_boundvars ~1 f
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              | _ => Abs (a, T, t'))
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          | t' => Abs (a, T, t'))
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      | eta_abs t = t;
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  in
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    if Config.get ctxt eta_contract then eta_abs tm else tm
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  end;
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fun abs_tr' ctxt tm =
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  uncurry (fold_rev (fn x => fn t => Lexicon.const "_abs" $ x $ t))
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    (strip_abss strip_abs_vars strip_abs_body (eta_contr ctxt tm));
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fun atomic_abs_tr' (x, T, t) =
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  let val [xT] = Term.rename_wrt_term t [(x, T)]
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  in (mark_boundT xT, subst_bound (mark_bound (fst xT), t)) end;
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fun abs_ast_tr' (*"_abs"*) asts =
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  (case Ast.unfold_ast_p "_abs" (Ast.Appl (Ast.Constant "_abs" :: asts)) of
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    ([], _) => raise Ast.AST ("abs_ast_tr'", asts)
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  | (xs, body) => Ast.Appl [Ast.Constant "_lambda", Ast.fold_ast "_pttrns" xs, body]);
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fun preserve_binder_abs_tr' name syn = (name, fn (Abs abs :: ts) =>
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  let val (x, t) = atomic_abs_tr' abs
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  in list_comb (Lexicon.const syn $ x $ t, ts) end);
haftmann@32120
   316
haftmann@32120
   317
fun preserve_binder_abs2_tr' name syn = (name, fn (A :: Abs abs :: ts) =>
haftmann@32120
   318
  let val (x, t) = atomic_abs_tr' abs
haftmann@32120
   319
  in list_comb (Lexicon.const syn $ x $ A $ t, ts) end);
haftmann@32120
   320
wenzelm@548
   321
wenzelm@548
   322
(* binder *)
wenzelm@548
   323
wenzelm@21535
   324
fun mk_binder_tr' (name, syn) =
wenzelm@548
   325
  let
wenzelm@548
   326
    fun mk_idts [] = raise Match    (*abort translation*)
wenzelm@548
   327
      | mk_idts [idt] = idt
wenzelm@5690
   328
      | mk_idts (idt :: idts) = Lexicon.const "_idts" $ idt $ mk_idts idts;
wenzelm@548
   329
wenzelm@548
   330
    fun tr' t =
wenzelm@548
   331
      let
wenzelm@548
   332
        val (xs, bd) = strip_abss (strip_qnt_vars name) (strip_qnt_body name) t;
wenzelm@21535
   333
      in Lexicon.const syn $ mk_idts xs $ bd end;
wenzelm@548
   334
wenzelm@21535
   335
    fun binder_tr' (t :: ts) = Term.list_comb (tr' (Lexicon.const name $ t), ts)
wenzelm@21535
   336
      | binder_tr' [] = raise Match;
wenzelm@21535
   337
  in (name, binder_tr') end;
wenzelm@548
   338
wenzelm@548
   339
wenzelm@3691
   340
(* idtyp constraints *)
wenzelm@548
   341
wenzelm@42045
   342
fun idtyp_ast_tr' a [Ast.Appl [Ast.Constant "_constrain", x, ty], xs] =
wenzelm@42045
   343
      Ast.Appl [Ast.Constant a, Ast.Appl [Ast.Constant "_idtyp", x, ty], xs]
wenzelm@3691
   344
  | idtyp_ast_tr' _ _ = raise Match;
wenzelm@548
   345
wenzelm@548
   346
wenzelm@28628
   347
(* type propositions *)
wenzelm@28628
   348
wenzelm@35255
   349
fun type_prop_tr' _ (*"_type_prop"*) T [Const ("\\<^const>Pure.sort_constraint", _)] =
wenzelm@37216
   350
      Lexicon.const "_sort_constraint" $ Type_Ext.term_of_typ true T
wenzelm@28628
   351
  | type_prop_tr' show_sorts (*"_type_prop"*) T [t] =
wenzelm@37216
   352
      Lexicon.const "_ofclass" $ Type_Ext.term_of_typ show_sorts T $ t
wenzelm@28628
   353
  | type_prop_tr' _ (*"_type_prop"*) T ts = raise TYPE ("type_prop_tr'", [T], ts);
wenzelm@28628
   354
wenzelm@28628
   355
wenzelm@548
   356
(* meta propositions *)
wenzelm@548
   357
wenzelm@4148
   358
fun prop_tr' tm =
wenzelm@548
   359
  let
wenzelm@5690
   360
    fun aprop t = Lexicon.const "_aprop" $ t;
wenzelm@548
   361
wenzelm@2698
   362
    fun is_prop Ts t =
wenzelm@2698
   363
      fastype_of1 (Ts, t) = propT handle TERM _ => false;
wenzelm@548
   364
wenzelm@35429
   365
    fun is_term (Const ("Pure.term", _) $ _) = true
wenzelm@19848
   366
      | is_term _ = false;
wenzelm@19848
   367
wenzelm@548
   368
    fun tr' _ (t as Const _) = t
wenzelm@18478
   369
      | tr' Ts (t as Const ("_bound", _) $ u) =
wenzelm@18478
   370
          if is_prop Ts u then aprop t else t
wenzelm@2698
   371
      | tr' _ (t as Free (x, T)) =
wenzelm@5690
   372
          if T = propT then aprop (Lexicon.free x) else t
wenzelm@2698
   373
      | tr' _ (t as Var (xi, T)) =
wenzelm@5690
   374
          if T = propT then aprop (Lexicon.var xi) else t
wenzelm@2698
   375
      | tr' Ts (t as Bound _) =
wenzelm@2698
   376
          if is_prop Ts t then aprop t else t
wenzelm@2698
   377
      | tr' Ts (Abs (x, T, t)) = Abs (x, T, tr' (T :: Ts) t)
wenzelm@35429
   378
      | tr' Ts (t as t1 $ (t2 as Const ("TYPE", Type ("itself", [T])))) =
wenzelm@28628
   379
          if is_prop Ts t andalso not (is_term t) then Const ("_type_prop", T) $ tr' Ts t1
wenzelm@2698
   380
          else tr' Ts t1 $ tr' Ts t2
wenzelm@2698
   381
      | tr' Ts (t as t1 $ t2) =
wenzelm@5690
   382
          (if is_Const (Term.head_of t) orelse not (is_prop Ts t)
wenzelm@2698
   383
            then I else aprop) (tr' Ts t1 $ tr' Ts t2);
wenzelm@16612
   384
  in tr' [] tm end;
wenzelm@548
   385
wenzelm@2698
   386
wenzelm@548
   387
(* meta implication *)
wenzelm@548
   388
wenzelm@548
   389
fun impl_ast_tr' (*"==>"*) asts =
wenzelm@37216
   390
  if Type_Ext.no_brackets () then raise Match
wenzelm@10572
   391
  else
wenzelm@35255
   392
    (case Ast.unfold_ast_p "\\<^const>==>" (Ast.Appl (Ast.Constant "\\<^const>==>" :: asts)) of
wenzelm@16612
   393
      (prems as _ :: _ :: _, concl) =>
wenzelm@16612
   394
        let
wenzelm@16612
   395
          val (asms, asm) = split_last prems;
wenzelm@16612
   396
          val asms' = Ast.fold_ast_p "_asms" (asms, Ast.Appl [Ast.Constant "_asm", asm]);
wenzelm@16612
   397
        in Ast.Appl [Ast.Constant "_bigimpl", asms', concl] end
schirmer@15421
   398
    | _ => raise Match);
schirmer@15421
   399
wenzelm@548
   400
wenzelm@4148
   401
(* type reflection *)
wenzelm@4148
   402
wenzelm@4148
   403
fun type_tr' show_sorts (*"TYPE"*) (Type ("itself", [T])) ts =
wenzelm@37216
   404
      Term.list_comb (Lexicon.const "_TYPE" $ Type_Ext.term_of_typ show_sorts T, ts)
wenzelm@4148
   405
  | type_tr' _ _ _ = raise Match;
wenzelm@4148
   406
wenzelm@4148
   407
wenzelm@19577
   408
(* type constraints *)
wenzelm@19577
   409
wenzelm@19577
   410
fun type_constraint_tr' show_sorts (*"_type_constraint_"*) (Type ("fun", [T, _])) (t :: ts) =
wenzelm@37216
   411
      Term.list_comb (Lexicon.const Syn_Ext.constrainC $ t $ Type_Ext.term_of_typ show_sorts T, ts)
wenzelm@19577
   412
  | type_constraint_tr' _ _ _ = raise Match;
wenzelm@19577
   413
wenzelm@19577
   414
wenzelm@548
   415
(* dependent / nondependent quantifiers *)
wenzelm@548
   416
wenzelm@20202
   417
fun var_abs mark (x, T, b) =
wenzelm@20202
   418
  let val ([x'], _) = Name.variants [x] (Term.declare_term_names b Name.context)
wenzelm@20202
   419
  in (x', subst_bound (mark (x', T), b)) end;
wenzelm@20202
   420
wenzelm@20202
   421
val variant_abs = var_abs Free;
wenzelm@20202
   422
val variant_abs' = var_abs mark_boundT;
wenzelm@2698
   423
wenzelm@548
   424
fun dependent_tr' (q, r) (A :: Abs (x, T, B) :: ts) =
wenzelm@5084
   425
      if Term.loose_bvar1 (B, 0) then
wenzelm@2698
   426
        let val (x', B') = variant_abs' (x, dummyT, B);
wenzelm@5690
   427
        in Term.list_comb (Lexicon.const q $ mark_boundT (x', T) $ A $ B', ts) end
wenzelm@5690
   428
      else Term.list_comb (Lexicon.const r $ A $ B, ts)
wenzelm@548
   429
  | dependent_tr' _ _ = raise Match;
wenzelm@548
   430
wenzelm@548
   431
wenzelm@5084
   432
(* quote / antiquote *)
wenzelm@5084
   433
wenzelm@8577
   434
fun antiquote_tr' name =
wenzelm@8577
   435
  let
wenzelm@8577
   436
    fun tr' i (t $ u) =
wenzelm@18139
   437
      if u aconv Bound i then Lexicon.const name $ tr' i t
wenzelm@8577
   438
      else tr' i t $ tr' i u
wenzelm@8577
   439
      | tr' i (Abs (x, T, t)) = Abs (x, T, tr' (i + 1) t)
wenzelm@18139
   440
      | tr' i a = if a aconv Bound i then raise Match else a;
wenzelm@8577
   441
  in tr' 0 end;
wenzelm@8577
   442
wenzelm@8577
   443
fun quote_tr' name (Abs (_, _, t)) = Term.incr_boundvars ~1 (antiquote_tr' name t)
wenzelm@8577
   444
  | quote_tr' _ _ = raise Match;
wenzelm@8577
   445
wenzelm@5084
   446
fun quote_antiquote_tr' quoteN antiquoteN name =
wenzelm@5084
   447
  let
wenzelm@8577
   448
    fun tr' (t :: ts) = Term.list_comb (Lexicon.const quoteN $ quote_tr' antiquoteN t, ts)
wenzelm@8577
   449
      | tr' _ = raise Match;
wenzelm@8577
   450
  in (name, tr') end;
wenzelm@5084
   451
wenzelm@5084
   452
wenzelm@35145
   453
(* corresponding updates *)
wenzelm@35145
   454
wenzelm@35145
   455
fun upd_tr' (x_upd, T) =
wenzelm@35145
   456
  (case try (unsuffix "_update") x_upd of
wenzelm@35145
   457
    SOME x => (x, if T = dummyT then T else Term.domain_type T)
wenzelm@35145
   458
  | NONE => raise Match);
wenzelm@35145
   459
wenzelm@35145
   460
fun update_name_tr' (Free x) = Free (upd_tr' x)
wenzelm@35145
   461
  | update_name_tr' ((c as Const ("_free", _)) $ Free x) = c $ Free (upd_tr' x)
wenzelm@35145
   462
  | update_name_tr' (Const x) = Const (upd_tr' x)
wenzelm@35145
   463
  | update_name_tr' _ = raise Match;
wenzelm@35145
   464
wenzelm@35145
   465
wenzelm@14697
   466
(* indexed syntax *)
wenzelm@548
   467
wenzelm@14697
   468
fun index_ast_tr' (*"_index"*) [Ast.Appl [Ast.Constant "_struct", ast]] = ast
wenzelm@14697
   469
  | index_ast_tr' _ = raise Match;
wenzelm@14697
   470
wenzelm@14697
   471
wenzelm@14697
   472
(* implicit structures *)
wenzelm@14697
   473
wenzelm@14697
   474
fun the_struct' structs s =
wenzelm@14697
   475
  [(case Lexicon.read_nat s of
wenzelm@18678
   476
    SOME i => Ast.Variable (the_struct structs i handle ERROR _ => raise Match)
skalberg@15531
   477
  | NONE => raise Match)] |> Ast.mk_appl (Ast.Constant "_free");
wenzelm@14697
   478
wenzelm@14697
   479
fun struct_ast_tr' structs (*"_struct"*) [Ast.Constant "_indexdefault"] =
wenzelm@14697
   480
      the_struct' structs "1"
wenzelm@14697
   481
  | struct_ast_tr' structs (*"_struct"*) [Ast.Appl [Ast.Constant "_indexnum", Ast.Constant s]] =
wenzelm@14697
   482
      the_struct' structs s
wenzelm@14697
   483
  | struct_ast_tr' _ _ = raise Match;
wenzelm@14697
   484
wenzelm@14697
   485
wenzelm@14697
   486
wenzelm@14697
   487
(** Pure translations **)
wenzelm@548
   488
wenzelm@548
   489
val pure_trfuns =
wenzelm@35145
   490
  ([("_constify", constify_ast_tr),
wenzelm@35145
   491
    ("_appl", appl_ast_tr),
wenzelm@35145
   492
    ("_applC", applC_ast_tr),
wenzelm@35145
   493
    ("_lambda", lambda_ast_tr),
wenzelm@35145
   494
    ("_idtyp", idtyp_ast_tr),
wenzelm@35145
   495
    ("_idtypdummy", idtypdummy_ast_tr),
wenzelm@35145
   496
    ("_bigimpl", bigimpl_ast_tr),
wenzelm@35145
   497
    ("_indexdefault", indexdefault_ast_tr),
wenzelm@35145
   498
    ("_indexnum", indexnum_ast_tr),
wenzelm@35145
   499
    ("_indexvar", indexvar_ast_tr),
wenzelm@35145
   500
    ("_struct", struct_ast_tr)],
wenzelm@35145
   501
   [("_abs", abs_tr),
wenzelm@35145
   502
    ("_aprop", aprop_tr),
wenzelm@35145
   503
    ("_ofclass", ofclass_tr),
wenzelm@35145
   504
    ("_sort_constraint", sort_constraint_tr),
wenzelm@35145
   505
    ("_TYPE", type_tr),
wenzelm@35145
   506
    ("_DDDOT", dddot_tr),
wenzelm@35145
   507
    ("_update_name", update_name_tr),
wenzelm@35145
   508
    ("_index", index_tr)],
wenzelm@35198
   509
   ([]: (string * (term list -> term)) list),
wenzelm@35145
   510
   [("_abs", abs_ast_tr'),
wenzelm@35145
   511
    ("_idts", idtyp_ast_tr' "_idts"),
wenzelm@35145
   512
    ("_pttrns", idtyp_ast_tr' "_pttrns"),
wenzelm@35255
   513
    ("\\<^const>==>", impl_ast_tr'),
wenzelm@35145
   514
    ("_index", index_ast_tr')]);
wenzelm@548
   515
wenzelm@2698
   516
val pure_trfunsT =
wenzelm@35255
   517
 [("_type_prop", type_prop_tr'),
wenzelm@35255
   518
  ("\\<^const>TYPE", type_tr'),
wenzelm@35255
   519
  ("_type_constraint_", type_constraint_tr')];
wenzelm@2698
   520
wenzelm@14697
   521
fun struct_trfuns structs =
wenzelm@14697
   522
  ([], [("_struct", struct_tr structs)], [], [("_struct", struct_ast_tr' structs)]);
wenzelm@14697
   523
wenzelm@548
   524
wenzelm@548
   525
wenzelm@42043
   526
(** parsetree_to_ast **)
wenzelm@548
   527
wenzelm@42048
   528
fun parsetree_to_ast ctxt constrain_pos trf =
wenzelm@548
   529
  let
wenzelm@548
   530
    fun trans a args =
wenzelm@548
   531
      (case trf a of
skalberg@15531
   532
        NONE => Ast.mk_appl (Ast.Constant a) args
wenzelm@23937
   533
      | SOME f => f ctxt args);
wenzelm@548
   534
wenzelm@42048
   535
    fun ast_of (Parser.Node ("_constrain_position", [pt as Parser.Tip tok])) =
wenzelm@42048
   536
          if constrain_pos then
wenzelm@42048
   537
            Ast.Appl [Ast.Constant "_constrain", ast_of pt,
wenzelm@42048
   538
              Ast.Variable (Lexicon.encode_position (Lexicon.pos_of_token tok))]
wenzelm@42048
   539
          else ast_of pt
wenzelm@42048
   540
      | ast_of (Parser.Node (a, pts)) = trans a (map ast_of pts)
wenzelm@5690
   541
      | ast_of (Parser.Tip tok) = Ast.Variable (Lexicon.str_of_token tok);
wenzelm@42043
   542
  in ast_of end;
wenzelm@548
   543
wenzelm@548
   544
wenzelm@548
   545
wenzelm@42043
   546
(** ast_to_term **)
wenzelm@548
   547
wenzelm@42043
   548
fun ast_to_term ctxt trf =
wenzelm@548
   549
  let
wenzelm@548
   550
    fun trans a args =
wenzelm@548
   551
      (case trf a of
skalberg@15531
   552
        NONE => Term.list_comb (Lexicon.const a, args)
wenzelm@23937
   553
      | SOME f => f ctxt args);
wenzelm@548
   554
wenzelm@5690
   555
    fun term_of (Ast.Constant a) = trans a []
wenzelm@5690
   556
      | term_of (Ast.Variable x) = Lexicon.read_var x
wenzelm@5690
   557
      | term_of (Ast.Appl (Ast.Constant a :: (asts as _ :: _))) =
wenzelm@548
   558
          trans a (map term_of asts)
wenzelm@5690
   559
      | term_of (Ast.Appl (ast :: (asts as _ :: _))) =
wenzelm@5690
   560
          Term.list_comb (term_of ast, map term_of asts)
wenzelm@5690
   561
      | term_of (ast as Ast.Appl _) = raise Ast.AST ("ast_to_term: malformed ast", [ast]);
wenzelm@42043
   562
  in term_of end;
wenzelm@548
   563
wenzelm@548
   564
end;