typing/subst.mli

   1 (***********************************************************************)
   2 (*                                                                     *)
   3 (*                           Objective Caml                            *)
   4 (*                                                                     *)
   5 (*            Xavier Leroy, projet Cristal, INRIA Rocquencourt         *)
   6 (*                                                                     *)
   7 (*  Copyright 1996 Institut National de Recherche en Informatique et   *)
   8 (*  en Automatique.  All rights reserved.  This file is distributed    *)
   9 (*  under the terms of the Q Public License version 1.0.               *)
  10 (*                                                                     *)
  11 (***********************************************************************)
  12
  13 (* $Id$ *)
  14
  15 (* Substitutions *)
  16
  17 open Types
  18
  19 type t
  20
  21 (*
  22    Substitutions are used to translate a type from one context to
  23    another.  This requires substituing paths for identifiers, and
  24    possibly also lowering the level of non-generic variables so that
  25    it be inferior to the maximum level of the new context.
  26
  27    Substitutions can also be used to create a "clean" copy of a type.
  28    Indeed, non-variable node of a type are duplicated, with their
  29    levels set to generic level.  That way, the resulting type is
  30    well-formed (decreasing levels), even if the original one was not.
  31 *)
  32
  33 val identity: t
  34
  35 val add_type: Ident.t -> Path.t -> t -> t
  36 val add_module: Ident.t -> Path.t -> t -> t
  37 val add_modtype: Ident.t -> module_type -> t -> t
  38 val for_saving: t -> t
  39 val reset_for_saving: unit -> unit
  40
  41 val module_path: t -> Path.t -> Path.t
  42 val type_path: t -> Path.t -> Path.t
  43
  44 val type_expr: t -> type_expr -> type_expr
  45 val class_type: t -> class_type -> class_type
  46 val value_description: t -> value_description -> value_description
  47 val type_declaration: t -> type_declaration -> type_declaration
  48 val exception_declaration:
  49         t -> exception_declaration -> exception_declaration
  50 val class_declaration: t -> class_declaration -> class_declaration
  51 val cltype_declaration: t -> cltype_declaration -> cltype_declaration
  52 val modtype: t -> module_type -> module_type
  53 val signature: t -> signature -> signature
  54 val modtype_declaration: t -> modtype_declaration -> modtype_declaration