60 lines
2.5 KiB
OCaml
60 lines
2.5 KiB
OCaml
(***********************************************************************)
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(* *)
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(* OCaml *)
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(* *)
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(* Xavier Leroy, projet Cristal, INRIA Rocquencourt *)
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(* *)
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(* Copyright 1996 Institut National de Recherche en Informatique et *)
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(* en Automatique. All rights reserved. This file is distributed *)
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(* under the terms of the Q Public License version 1.0. *)
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(* *)
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(***********************************************************************)
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(* Substitutions *)
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open Types
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type t
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(*
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Substitutions are used to translate a type from one context to
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another. This requires substituing paths for identifiers, and
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possibly also lowering the level of non-generic variables so that
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it be inferior to the maximum level of the new context.
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Substitutions can also be used to create a "clean" copy of a type.
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Indeed, non-variable node of a type are duplicated, with their
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levels set to generic level. That way, the resulting type is
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well-formed (decreasing levels), even if the original one was not.
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*)
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val identity: t
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val add_type: Ident.t -> Path.t -> t -> t
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val add_module: Ident.t -> Path.t -> t -> t
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val add_modtype: Ident.t -> module_type -> t -> t
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val for_saving: t -> t
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val reset_for_saving: unit -> unit
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val module_path: t -> Path.t -> Path.t
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val type_path: t -> Path.t -> Path.t
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val type_expr: t -> type_expr -> type_expr
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val class_type: t -> class_type -> class_type
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val value_description: t -> value_description -> value_description
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val type_declaration: t -> type_declaration -> type_declaration
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val extension_constructor:
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t -> extension_constructor -> extension_constructor
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val class_declaration: t -> class_declaration -> class_declaration
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val cltype_declaration: t -> class_type_declaration -> class_type_declaration
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val modtype: t -> module_type -> module_type
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val signature: t -> signature -> signature
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val modtype_declaration: t -> modtype_declaration -> modtype_declaration
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val module_declaration: t -> module_declaration -> module_declaration
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val typexp : t -> Types.type_expr -> Types.type_expr
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val class_signature: t -> class_signature -> class_signature
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(* Composition of substitutions:
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apply (compose s1 s2) x = apply s2 (apply s1 x) *)
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val compose: t -> t -> t
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