src/Pure/Syntax/syn_trans.ML
author wenzelm
Sat Mar 26 10:52:29 2011 +0100 (2011-03-26)
changeset 42085 2ba15af46cb7
parent 42084 532b3a76103f
child 42086 74bf78db0d87
permissions -rw-r--r--
tuned;
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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 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 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 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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(* strip_positions *)
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fun strip_positions_ast_tr [ast] = Type_Ext.strip_positions_ast ast
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  | strip_positions_ast_tr asts = raise Ast.AST ("strip_positions_ast_tr", asts);
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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 err ts = raise TERM ("binder_tr: " ^ syn, ts)
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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 _ => err [x, t]
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          in Lexicon.const name $ abs end
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      | binder_tr ts = err 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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      if Type_Ext.is_position ty then list_comb (c $ update_name_tr [t] $ ty, ts)
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      else
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        list_comb (c $ update_name_tr [t] $
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          (Lexicon.fun_type $
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            (Lexicon.fun_type $ Lexicon.dummy_type $ ty) $ Lexicon.dummy_type), 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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(* partial eta-contraction before printing *)
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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 Const ("_aprop", _) $ _ => Abs (a, T, t')
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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.is_dependent 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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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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  if Config.get ctxt eta_contract then eta_abs tm else tm;
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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.is_dependent b)
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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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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' 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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(* binders *)
wenzelm@548
   321
wenzelm@21535
   322
fun mk_binder_tr' (name, syn) =
wenzelm@548
   323
  let
wenzelm@548
   324
    fun mk_idts [] = raise Match    (*abort translation*)
wenzelm@548
   325
      | mk_idts [idt] = idt
wenzelm@5690
   326
      | mk_idts (idt :: idts) = Lexicon.const "_idts" $ idt $ mk_idts idts;
wenzelm@548
   327
wenzelm@548
   328
    fun tr' t =
wenzelm@548
   329
      let
wenzelm@548
   330
        val (xs, bd) = strip_abss (strip_qnt_vars name) (strip_qnt_body name) t;
wenzelm@21535
   331
      in Lexicon.const syn $ mk_idts xs $ bd end;
wenzelm@548
   332
wenzelm@21535
   333
    fun binder_tr' (t :: ts) = Term.list_comb (tr' (Lexicon.const name $ t), ts)
wenzelm@21535
   334
      | binder_tr' [] = raise Match;
wenzelm@21535
   335
  in (name, binder_tr') end;
wenzelm@548
   336
wenzelm@42085
   337
fun preserve_binder_abs_tr' name syn = (name, fn Abs abs :: ts =>
wenzelm@42085
   338
  let val (x, t) = atomic_abs_tr' abs
wenzelm@42085
   339
  in list_comb (Lexicon.const syn $ x $ t, ts) end);
wenzelm@42085
   340
wenzelm@42085
   341
fun preserve_binder_abs2_tr' name syn = (name, fn A :: Abs abs :: ts =>
wenzelm@42085
   342
  let val (x, t) = atomic_abs_tr' abs
wenzelm@42085
   343
  in list_comb (Lexicon.const syn $ x $ A $ t, ts) end);
wenzelm@42085
   344
wenzelm@548
   345
wenzelm@3691
   346
(* idtyp constraints *)
wenzelm@548
   347
wenzelm@42045
   348
fun idtyp_ast_tr' a [Ast.Appl [Ast.Constant "_constrain", x, ty], xs] =
wenzelm@42045
   349
      Ast.Appl [Ast.Constant a, Ast.Appl [Ast.Constant "_idtyp", x, ty], xs]
wenzelm@3691
   350
  | idtyp_ast_tr' _ _ = raise Match;
wenzelm@548
   351
wenzelm@548
   352
wenzelm@28628
   353
(* type propositions *)
wenzelm@28628
   354
wenzelm@35255
   355
fun type_prop_tr' _ (*"_type_prop"*) T [Const ("\\<^const>Pure.sort_constraint", _)] =
wenzelm@37216
   356
      Lexicon.const "_sort_constraint" $ Type_Ext.term_of_typ true T
wenzelm@28628
   357
  | type_prop_tr' show_sorts (*"_type_prop"*) T [t] =
wenzelm@37216
   358
      Lexicon.const "_ofclass" $ Type_Ext.term_of_typ show_sorts T $ t
wenzelm@28628
   359
  | type_prop_tr' _ (*"_type_prop"*) T ts = raise TYPE ("type_prop_tr'", [T], ts);
wenzelm@28628
   360
wenzelm@28628
   361
wenzelm@548
   362
(* meta propositions *)
wenzelm@548
   363
wenzelm@4148
   364
fun prop_tr' tm =
wenzelm@548
   365
  let
wenzelm@5690
   366
    fun aprop t = Lexicon.const "_aprop" $ t;
wenzelm@548
   367
wenzelm@2698
   368
    fun is_prop Ts t =
wenzelm@2698
   369
      fastype_of1 (Ts, t) = propT handle TERM _ => false;
wenzelm@548
   370
wenzelm@35429
   371
    fun is_term (Const ("Pure.term", _) $ _) = true
wenzelm@19848
   372
      | is_term _ = false;
wenzelm@19848
   373
wenzelm@548
   374
    fun tr' _ (t as Const _) = t
wenzelm@18478
   375
      | tr' Ts (t as Const ("_bound", _) $ u) =
wenzelm@18478
   376
          if is_prop Ts u then aprop t else t
wenzelm@2698
   377
      | tr' _ (t as Free (x, T)) =
wenzelm@5690
   378
          if T = propT then aprop (Lexicon.free x) else t
wenzelm@2698
   379
      | tr' _ (t as Var (xi, T)) =
wenzelm@5690
   380
          if T = propT then aprop (Lexicon.var xi) else t
wenzelm@2698
   381
      | tr' Ts (t as Bound _) =
wenzelm@2698
   382
          if is_prop Ts t then aprop t else t
wenzelm@2698
   383
      | tr' Ts (Abs (x, T, t)) = Abs (x, T, tr' (T :: Ts) t)
wenzelm@35429
   384
      | tr' Ts (t as t1 $ (t2 as Const ("TYPE", Type ("itself", [T])))) =
wenzelm@28628
   385
          if is_prop Ts t andalso not (is_term t) then Const ("_type_prop", T) $ tr' Ts t1
wenzelm@2698
   386
          else tr' Ts t1 $ tr' Ts t2
wenzelm@2698
   387
      | tr' Ts (t as t1 $ t2) =
wenzelm@5690
   388
          (if is_Const (Term.head_of t) orelse not (is_prop Ts t)
wenzelm@2698
   389
            then I else aprop) (tr' Ts t1 $ tr' Ts t2);
wenzelm@16612
   390
  in tr' [] tm end;
wenzelm@548
   391
wenzelm@2698
   392
wenzelm@548
   393
(* meta implication *)
wenzelm@548
   394
wenzelm@548
   395
fun impl_ast_tr' (*"==>"*) asts =
wenzelm@37216
   396
  if Type_Ext.no_brackets () then raise Match
wenzelm@10572
   397
  else
wenzelm@35255
   398
    (case Ast.unfold_ast_p "\\<^const>==>" (Ast.Appl (Ast.Constant "\\<^const>==>" :: asts)) of
wenzelm@16612
   399
      (prems as _ :: _ :: _, concl) =>
wenzelm@16612
   400
        let
wenzelm@16612
   401
          val (asms, asm) = split_last prems;
wenzelm@16612
   402
          val asms' = Ast.fold_ast_p "_asms" (asms, Ast.Appl [Ast.Constant "_asm", asm]);
wenzelm@16612
   403
        in Ast.Appl [Ast.Constant "_bigimpl", asms', concl] end
schirmer@15421
   404
    | _ => raise Match);
schirmer@15421
   405
wenzelm@548
   406
wenzelm@4148
   407
(* type reflection *)
wenzelm@4148
   408
wenzelm@4148
   409
fun type_tr' show_sorts (*"TYPE"*) (Type ("itself", [T])) ts =
wenzelm@37216
   410
      Term.list_comb (Lexicon.const "_TYPE" $ Type_Ext.term_of_typ show_sorts T, ts)
wenzelm@4148
   411
  | type_tr' _ _ _ = raise Match;
wenzelm@4148
   412
wenzelm@4148
   413
wenzelm@19577
   414
(* type constraints *)
wenzelm@19577
   415
wenzelm@19577
   416
fun type_constraint_tr' show_sorts (*"_type_constraint_"*) (Type ("fun", [T, _])) (t :: ts) =
wenzelm@37216
   417
      Term.list_comb (Lexicon.const Syn_Ext.constrainC $ t $ Type_Ext.term_of_typ show_sorts T, ts)
wenzelm@19577
   418
  | type_constraint_tr' _ _ _ = raise Match;
wenzelm@19577
   419
wenzelm@19577
   420
wenzelm@548
   421
(* dependent / nondependent quantifiers *)
wenzelm@548
   422
wenzelm@20202
   423
fun var_abs mark (x, T, b) =
wenzelm@20202
   424
  let val ([x'], _) = Name.variants [x] (Term.declare_term_names b Name.context)
wenzelm@20202
   425
  in (x', subst_bound (mark (x', T), b)) end;
wenzelm@20202
   426
wenzelm@20202
   427
val variant_abs = var_abs Free;
wenzelm@20202
   428
val variant_abs' = var_abs mark_boundT;
wenzelm@2698
   429
wenzelm@548
   430
fun dependent_tr' (q, r) (A :: Abs (x, T, B) :: ts) =
wenzelm@42083
   431
      if Term.is_dependent B then
wenzelm@2698
   432
        let val (x', B') = variant_abs' (x, dummyT, B);
wenzelm@5690
   433
        in Term.list_comb (Lexicon.const q $ mark_boundT (x', T) $ A $ B', ts) end
wenzelm@42084
   434
      else Term.list_comb (Lexicon.const r $ A $ incr_boundvars ~1 B, ts)
wenzelm@548
   435
  | dependent_tr' _ _ = raise Match;
wenzelm@548
   436
wenzelm@548
   437
wenzelm@5084
   438
(* quote / antiquote *)
wenzelm@5084
   439
wenzelm@8577
   440
fun antiquote_tr' name =
wenzelm@8577
   441
  let
wenzelm@8577
   442
    fun tr' i (t $ u) =
wenzelm@42084
   443
          if u aconv Bound i then Lexicon.const name $ tr' i t
wenzelm@42084
   444
          else tr' i t $ tr' i u
wenzelm@8577
   445
      | tr' i (Abs (x, T, t)) = Abs (x, T, tr' (i + 1) t)
wenzelm@18139
   446
      | tr' i a = if a aconv Bound i then raise Match else a;
wenzelm@8577
   447
  in tr' 0 end;
wenzelm@8577
   448
wenzelm@8577
   449
fun quote_tr' name (Abs (_, _, t)) = Term.incr_boundvars ~1 (antiquote_tr' name t)
wenzelm@8577
   450
  | quote_tr' _ _ = raise Match;
wenzelm@8577
   451
wenzelm@5084
   452
fun quote_antiquote_tr' quoteN antiquoteN name =
wenzelm@5084
   453
  let
wenzelm@8577
   454
    fun tr' (t :: ts) = Term.list_comb (Lexicon.const quoteN $ quote_tr' antiquoteN t, ts)
wenzelm@8577
   455
      | tr' _ = raise Match;
wenzelm@8577
   456
  in (name, tr') end;
wenzelm@5084
   457
wenzelm@5084
   458
wenzelm@35145
   459
(* corresponding updates *)
wenzelm@35145
   460
wenzelm@42080
   461
local
wenzelm@42080
   462
wenzelm@42080
   463
fun upd_type (Type ("fun", [Type ("fun", [_, T]), _])) = T
wenzelm@42080
   464
  | upd_type _ = dummyT;
wenzelm@42080
   465
wenzelm@35145
   466
fun upd_tr' (x_upd, T) =
wenzelm@35145
   467
  (case try (unsuffix "_update") x_upd of
wenzelm@42080
   468
    SOME x => (x, upd_type T)
wenzelm@35145
   469
  | NONE => raise Match);
wenzelm@35145
   470
wenzelm@42080
   471
in
wenzelm@42080
   472
wenzelm@35145
   473
fun update_name_tr' (Free x) = Free (upd_tr' x)
wenzelm@35145
   474
  | update_name_tr' ((c as Const ("_free", _)) $ Free x) = c $ Free (upd_tr' x)
wenzelm@35145
   475
  | update_name_tr' (Const x) = Const (upd_tr' x)
wenzelm@35145
   476
  | update_name_tr' _ = raise Match;
wenzelm@35145
   477
wenzelm@42080
   478
end;
wenzelm@42080
   479
wenzelm@35145
   480
wenzelm@14697
   481
(* indexed syntax *)
wenzelm@548
   482
wenzelm@14697
   483
fun index_ast_tr' (*"_index"*) [Ast.Appl [Ast.Constant "_struct", ast]] = ast
wenzelm@14697
   484
  | index_ast_tr' _ = raise Match;
wenzelm@14697
   485
wenzelm@14697
   486
wenzelm@14697
   487
(* implicit structures *)
wenzelm@14697
   488
wenzelm@14697
   489
fun the_struct' structs s =
wenzelm@14697
   490
  [(case Lexicon.read_nat s of
wenzelm@18678
   491
    SOME i => Ast.Variable (the_struct structs i handle ERROR _ => raise Match)
skalberg@15531
   492
  | NONE => raise Match)] |> Ast.mk_appl (Ast.Constant "_free");
wenzelm@14697
   493
wenzelm@14697
   494
fun struct_ast_tr' structs (*"_struct"*) [Ast.Constant "_indexdefault"] =
wenzelm@14697
   495
      the_struct' structs "1"
wenzelm@14697
   496
  | struct_ast_tr' structs (*"_struct"*) [Ast.Appl [Ast.Constant "_indexnum", Ast.Constant s]] =
wenzelm@14697
   497
      the_struct' structs s
wenzelm@14697
   498
  | struct_ast_tr' _ _ = raise Match;
wenzelm@14697
   499
wenzelm@14697
   500
wenzelm@14697
   501
wenzelm@14697
   502
(** Pure translations **)
wenzelm@548
   503
wenzelm@548
   504
val pure_trfuns =
wenzelm@42057
   505
  ([("_strip_positions", strip_positions_ast_tr),
wenzelm@42057
   506
    ("_constify", constify_ast_tr),
wenzelm@35145
   507
    ("_appl", appl_ast_tr),
wenzelm@35145
   508
    ("_applC", applC_ast_tr),
wenzelm@35145
   509
    ("_lambda", lambda_ast_tr),
wenzelm@35145
   510
    ("_idtyp", idtyp_ast_tr),
wenzelm@35145
   511
    ("_idtypdummy", idtypdummy_ast_tr),
wenzelm@35145
   512
    ("_bigimpl", bigimpl_ast_tr),
wenzelm@35145
   513
    ("_indexdefault", indexdefault_ast_tr),
wenzelm@35145
   514
    ("_indexnum", indexnum_ast_tr),
wenzelm@35145
   515
    ("_indexvar", indexvar_ast_tr),
wenzelm@35145
   516
    ("_struct", struct_ast_tr)],
wenzelm@35145
   517
   [("_abs", abs_tr),
wenzelm@35145
   518
    ("_aprop", aprop_tr),
wenzelm@35145
   519
    ("_ofclass", ofclass_tr),
wenzelm@35145
   520
    ("_sort_constraint", sort_constraint_tr),
wenzelm@35145
   521
    ("_TYPE", type_tr),
wenzelm@35145
   522
    ("_DDDOT", dddot_tr),
wenzelm@35145
   523
    ("_update_name", update_name_tr),
wenzelm@35145
   524
    ("_index", index_tr)],
wenzelm@35198
   525
   ([]: (string * (term list -> term)) list),
wenzelm@35145
   526
   [("_abs", abs_ast_tr'),
wenzelm@35145
   527
    ("_idts", idtyp_ast_tr' "_idts"),
wenzelm@35145
   528
    ("_pttrns", idtyp_ast_tr' "_pttrns"),
wenzelm@35255
   529
    ("\\<^const>==>", impl_ast_tr'),
wenzelm@35145
   530
    ("_index", index_ast_tr')]);
wenzelm@548
   531
wenzelm@2698
   532
val pure_trfunsT =
wenzelm@35255
   533
 [("_type_prop", type_prop_tr'),
wenzelm@35255
   534
  ("\\<^const>TYPE", type_tr'),
wenzelm@35255
   535
  ("_type_constraint_", type_constraint_tr')];
wenzelm@2698
   536
wenzelm@14697
   537
fun struct_trfuns structs =
wenzelm@14697
   538
  ([], [("_struct", struct_tr structs)], [], [("_struct", struct_ast_tr' structs)]);
wenzelm@14697
   539
wenzelm@548
   540
wenzelm@548
   541
wenzelm@42043
   542
(** parsetree_to_ast **)
wenzelm@548
   543
wenzelm@42048
   544
fun parsetree_to_ast ctxt constrain_pos trf =
wenzelm@548
   545
  let
wenzelm@548
   546
    fun trans a args =
wenzelm@548
   547
      (case trf a of
skalberg@15531
   548
        NONE => Ast.mk_appl (Ast.Constant a) args
wenzelm@23937
   549
      | SOME f => f ctxt args);
wenzelm@548
   550
wenzelm@42048
   551
    fun ast_of (Parser.Node ("_constrain_position", [pt as Parser.Tip tok])) =
wenzelm@42048
   552
          if constrain_pos then
wenzelm@42048
   553
            Ast.Appl [Ast.Constant "_constrain", ast_of pt,
wenzelm@42048
   554
              Ast.Variable (Lexicon.encode_position (Lexicon.pos_of_token tok))]
wenzelm@42048
   555
          else ast_of pt
wenzelm@42048
   556
      | ast_of (Parser.Node (a, pts)) = trans a (map ast_of pts)
wenzelm@5690
   557
      | ast_of (Parser.Tip tok) = Ast.Variable (Lexicon.str_of_token tok);
wenzelm@42043
   558
  in ast_of end;
wenzelm@548
   559
wenzelm@548
   560
wenzelm@548
   561
wenzelm@42043
   562
(** ast_to_term **)
wenzelm@548
   563
wenzelm@42043
   564
fun ast_to_term ctxt trf =
wenzelm@548
   565
  let
wenzelm@548
   566
    fun trans a args =
wenzelm@548
   567
      (case trf a of
skalberg@15531
   568
        NONE => Term.list_comb (Lexicon.const a, args)
wenzelm@23937
   569
      | SOME f => f ctxt args);
wenzelm@548
   570
wenzelm@5690
   571
    fun term_of (Ast.Constant a) = trans a []
wenzelm@5690
   572
      | term_of (Ast.Variable x) = Lexicon.read_var x
wenzelm@5690
   573
      | term_of (Ast.Appl (Ast.Constant a :: (asts as _ :: _))) =
wenzelm@548
   574
          trans a (map term_of asts)
wenzelm@5690
   575
      | term_of (Ast.Appl (ast :: (asts as _ :: _))) =
wenzelm@5690
   576
          Term.list_comb (term_of ast, map term_of asts)
wenzelm@5690
   577
      | term_of (ast as Ast.Appl _) = raise Ast.AST ("ast_to_term: malformed ast", [ast]);
wenzelm@42043
   578
  in term_of end;
wenzelm@548
   579
wenzelm@548
   580
end;