ocaml/typing/subst.ml

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(* Substitutions *)
open Path
open Typedtree
type t =
{ types: Path.t Ident.tbl;
modules: Path.t Ident.tbl;
modtypes: module_type Ident.tbl }
let identity =
{ types = Ident.empty; modules = Ident.empty; modtypes = Ident.empty }
let add_type id p s =
{ types = Ident.add id p s.types;
modules = s.modules;
modtypes = s.modtypes }
let add_module id p s =
{ types = s.types;
modules = Ident.add id p s.modules;
modtypes = s.modtypes }
let add_modtype id ty s =
{ types = s.types;
modules = s.modules;
modtypes = Ident.add id ty s.modtypes }
let rec module_path s = function
Pident id as p ->
begin try Ident.find_same id s.modules with Not_found -> p end
| Pdot(p, n, pos) ->
Pdot(module_path s p, n, pos)
let type_path s = function
Pident id as p ->
begin try Ident.find_same id s.types with Not_found -> p end
| Pdot(p, n, pos) ->
Pdot(module_path s p, n, pos)
let rec type_expr s = function
Tvar{tvar_link = None} as ty -> ty
| Tvar{tvar_link = Some ty} -> type_expr s ty
| Tarrow(t1, t2) -> Tarrow(type_expr s t1, type_expr s t2)
| Ttuple tl -> Ttuple(List.map (type_expr s) tl)
| Tconstr(p, []) -> Tconstr(type_path s p, [])
| Tconstr(p, tl) -> Tconstr(type_path s p, List.map (type_expr s) tl)
let value_description s descr =
{ val_type = type_expr s descr.val_type;
val_prim = descr.val_prim }
let type_declaration s decl =
{ type_params = decl.type_params;
type_arity = decl.type_arity;
type_kind =
match decl.type_kind with
Type_abstract -> Type_abstract
| Type_manifest ty -> Type_manifest(type_expr s ty)
| Type_variant cstrs ->
Type_variant(List.map (fun (n, args) -> (n, List.map (type_expr s) args))
cstrs)
| Type_record lbls ->
Type_record(List.map (fun (n, mut, arg) -> (n, mut, type_expr s arg))
lbls)
}
let exception_declaration s tyl =
List.map (type_expr s) tyl
let rec modtype s = function
Tmty_ident p as mty ->
begin match p with
Pident id ->
begin try Ident.find_same id s.modtypes with Not_found -> mty end
| Pdot(p, n, pos) ->
Tmty_ident(Pdot(module_path s p, n, pos))
end
| Tmty_signature sg ->
Tmty_signature(signature s sg)
| Tmty_functor(id, arg, res) ->
Tmty_functor(id, modtype s arg, modtype s res)
and signature s sg = List.map (signature_item s) sg
and signature_item s = function
Tsig_value(id, d) -> Tsig_value(id, value_description s d)
| Tsig_type(id, d) -> Tsig_type(id, type_declaration s d)
| Tsig_exception(id, d) -> Tsig_exception(id, exception_declaration s d)
| Tsig_module(id, mty) -> Tsig_module(id, modtype s mty)
| Tsig_modtype(id, d) -> Tsig_modtype(id, modtype_declaration s d)
and modtype_declaration s = function
Tmodtype_abstract -> Tmodtype_abstract
| Tmodtype_manifest mty -> Tmodtype_manifest(modtype s mty)