92 lines
3.3 KiB
OCaml
92 lines
3.3 KiB
OCaml
(* camlp4r *)
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(****************************************************************************)
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(* *)
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(* Objective Caml *)
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(* *)
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(* INRIA Rocquencourt *)
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(* *)
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(* Copyright 2007 Institut National de Recherche en Informatique et *)
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(* en Automatique. All rights reserved. This file is distributed under *)
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(* the terms of the GNU Library General Public License, with the special *)
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(* exception on linking described in LICENSE at the top of the Objective *)
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(* Caml source tree. *)
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(* *)
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(****************************************************************************)
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(* Authors:
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* - Nicolas Pouillard: initial version
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*)
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module Make (Ast : Sig.Ast) : Sig.DynAst with module Ast = Ast = struct
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module Ast = Ast;
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type tag 'a =
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[ Tag_ctyp
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| Tag_patt
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| Tag_expr
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| Tag_module_type
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| Tag_sig_item
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| Tag_with_constr
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| Tag_module_expr
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| Tag_str_item
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| Tag_class_type
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| Tag_class_sig_item
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| Tag_class_expr
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| Tag_class_str_item
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| Tag_match_case
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| Tag_ident
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| Tag_binding
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| Tag_rec_binding
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| Tag_module_binding ];
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value string_of_tag =
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fun
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[ Tag_ctyp -> "ctyp"
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| Tag_patt -> "patt"
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| Tag_expr -> "expr"
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| Tag_module_type -> "module_type"
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| Tag_sig_item -> "sig_item"
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| Tag_with_constr -> "with_constr"
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| Tag_module_expr -> "module_expr"
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| Tag_str_item -> "str_item"
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| Tag_class_type -> "class_type"
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| Tag_class_sig_item -> "class_sig_item"
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| Tag_class_expr -> "class_expr"
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| Tag_class_str_item -> "class_str_item"
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| Tag_match_case -> "match_case"
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| Tag_ident -> "ident"
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| Tag_binding -> "binding"
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| Tag_rec_binding -> "rec_binding"
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| Tag_module_binding -> "module_binding" ];
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value ctyp_tag = Tag_ctyp;
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value patt_tag = Tag_patt;
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value expr_tag = Tag_expr;
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value module_type_tag = Tag_module_type;
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value sig_item_tag = Tag_sig_item;
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value with_constr_tag = Tag_with_constr;
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value module_expr_tag = Tag_module_expr;
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value str_item_tag = Tag_str_item;
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value class_type_tag = Tag_class_type;
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value class_sig_item_tag = Tag_class_sig_item;
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value class_expr_tag = Tag_class_expr;
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value class_str_item_tag = Tag_class_str_item;
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value match_case_tag = Tag_match_case;
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value ident_tag = Tag_ident;
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value binding_tag = Tag_binding;
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value rec_binding_tag = Tag_rec_binding;
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value module_binding_tag = Tag_module_binding;
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type dyn;
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external dyn_tag : tag 'a -> tag dyn = "%identity";
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module Pack(X : sig type t 'a; end) = struct
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(* These Obj.* hacks should be avoided with GADTs *)
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type pack = (tag dyn * Obj.t);
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exception Pack_error;
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value pack tag v = (dyn_tag tag, Obj.repr v);
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value unpack (tag : tag 'a) (tag', obj) =
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if dyn_tag tag = tag' then (Obj.obj obj : X.t 'a) else raise Pack_error;
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value print_tag f (tag, _) = Format.pp_print_string f (string_of_tag tag);
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end;
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end;
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