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mediremimediremi
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Add type expansion refactor from rescript-lang#7566 
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‎analysis/src/TypeUtils.ml‎

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@@ -1291,3 +1291,256 @@ let completionPathFromMaybeBuiltin path =
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(* Route Stdlib_X to Stdlib.X for proper completions without the Stdlib_ prefix *)
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Some (String.split_on_char '_' mainModule)
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| _ -> None)
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module ExpandType = struct
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type expandTypeInput =
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| TypeExpr of {
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typeExpr: Types.type_expr;
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name: string Location.loc option;
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env: QueryEnv.t;
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}
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| TypeDecl of {
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typeDecl: Types.type_declaration;
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name: string Location.loc;
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env: QueryEnv.t;
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}
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type expandTypeReturn = {
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mainTypes: expandTypeInput list;
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relatedTypes: expandTypeInput list;
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}
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module TypeIdSet = Set.Make (String)
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let expandTypes (input : expandTypeInput) ~(full : SharedTypes.full) =
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let rootEnv = QueryEnv.fromFile full.file in
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let expandTypeInputToKey = function
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| TypeExpr {name; env} ->
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typeId ~env
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~name:
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(match name with
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| None -> Location.mkloc "<unknown>" Location.none
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| Some n -> n)
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| TypeDecl {name; env} -> typeId ~env ~name
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in
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let deduplicateAndRemoveAlreadyPresent mainTypes relatedTypes =
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let mainIds = ref TypeIdSet.empty in
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let dedupedMain =
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mainTypes
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|> List.fold_left
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(fun acc item ->
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let id = expandTypeInputToKey item in
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if TypeIdSet.mem id !mainIds then acc
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else (
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mainIds := TypeIdSet.add id !mainIds;
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item :: acc))
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[]
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|> List.rev
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in
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let relatedIds = ref TypeIdSet.empty in
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let dedupedRelated =
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relatedTypes
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|> List.fold_left
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(fun acc item ->
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let id = expandTypeInputToKey item in
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if TypeIdSet.mem id !mainIds || TypeIdSet.mem id !relatedIds then
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acc
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else (
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relatedIds := TypeIdSet.add id !relatedIds;
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item :: acc))
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[]
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|> List.rev
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in
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(dedupedMain, dedupedRelated)
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in
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let rec followTypeAliases acc (typeExpr : Types.type_expr) =
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match typeExpr.desc with
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| Tlink t1 | Tsubst t1 | Tpoly (t1, []) -> followTypeAliases acc t1
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| Tconstr (path, typeArgs, _) -> (
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match
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References.digConstructor ~env:rootEnv ~package:full.package path
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with
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| Some
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( env,
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{
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name;
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item = {decl = {type_manifest = Some t1; type_params} as decl};
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} ) ->
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let instantiated =
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instantiateType ~typeParams:type_params ~typeArgs t1
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in
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let currentAlias = TypeDecl {typeDecl = decl; name; env} in
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followTypeAliases (currentAlias :: acc) instantiated
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| Some (env, {name; item = {decl}}) ->
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TypeDecl {typeDecl = decl; name; env} :: acc
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| None -> acc)
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| _ -> acc
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in
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let rec findFinalConcreteType (typeExpr : Types.type_expr) =
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match typeExpr.desc with
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| Tlink t1 | Tsubst t1 | Tpoly (t1, []) -> findFinalConcreteType t1
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| Tconstr (path, typeArgs, _) -> (
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match
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References.digConstructor ~env:rootEnv ~package:full.package path
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with
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| Some (_env, {item = {decl = {type_manifest = Some t1; type_params}}})
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->
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let instantiated =
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instantiateType ~typeParams:type_params ~typeArgs t1
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in
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findFinalConcreteType instantiated
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| _ -> typeExpr)
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| _ -> typeExpr
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in
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let rec extractRelevantTypesFromTypeExpr ?(depth = 0)
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(typeExpr : Types.type_expr) =
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if depth > 1 then []
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else
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match typeExpr.desc with
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| Tlink t1 | Tsubst t1 | Tpoly (t1, []) ->
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extractRelevantTypesFromTypeExpr ~depth t1
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| Tconstr (path, typeArgs, _) ->
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let constructorTypes =
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match
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References.digConstructor ~env:rootEnv ~package:full.package path
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with
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| Some (env, {name; item = {kind = Record fields; decl}}) ->
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TypeDecl {typeDecl = decl; name; env}
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::
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(if depth = 0 then
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fields
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|> List.fold_left
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(fun acc field ->
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acc
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@ extractRelevantTypesFromTypeExpr ~depth:(depth + 1)
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field.typ)
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[]
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else [])
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| Some (env, {name; item = {kind = Variant constructors; decl}}) ->
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TypeDecl {typeDecl = decl; name; env}
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::
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(if depth = 0 then
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constructors
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|> List.fold_left
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(fun acc (constructor : Constructor.t) ->
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match constructor.args with
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| Args args ->
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args
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|> List.fold_left
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(fun acc (argType, _) ->
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acc
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@ extractRelevantTypesFromTypeExpr
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~depth:(depth + 1) argType)
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acc
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| InlineRecord fields ->
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fields
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|> List.fold_left
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(fun acc field ->
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acc
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@ extractRelevantTypesFromTypeExpr
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~depth:(depth + 1) field.typ)
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acc)
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[]
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else [])
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| Some (_env, {item = {decl = {type_manifest = Some t1}}}) ->
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extractRelevantTypesFromTypeExpr ~depth t1
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| _ -> []
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in
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let typeArgTypes =
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typeArgs
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|> List.fold_left
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(fun acc typeArg ->
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acc
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@ extractRelevantTypesFromTypeExpr ~depth:(depth + 1) typeArg)
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[]
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in
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constructorTypes @ typeArgTypes
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| Tvariant {row_fields} when depth = 0 ->
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row_fields
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|> List.fold_left
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(fun acc (_label, field) ->
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match field with
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| Types.Rpresent (Some typeExpr) ->
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acc
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@ extractRelevantTypesFromTypeExpr ~depth:(depth + 1)
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typeExpr
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| Reither (_, typeExprs, _, _) ->
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typeExprs
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|> List.fold_left
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(fun acc typeExpr ->
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acc
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@ extractRelevantTypesFromTypeExpr ~depth:(depth + 1)
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typeExpr)
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acc
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| _ -> acc)
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[]
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| _ -> []
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in
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let extractRelevantTypesFromTypeDecl (typeDecl : Types.type_declaration) =
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match typeDecl.type_manifest with
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| Some typeExpr -> extractRelevantTypesFromTypeExpr typeExpr
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| None -> (
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match typeDecl.type_kind with
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| Type_record (label_declarations, _) ->
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label_declarations
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|> List.fold_left
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(fun acc (label_decl : Types.label_declaration) ->
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acc
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@ extractRelevantTypesFromTypeExpr ~depth:1 label_decl.ld_type)
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[]
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| Type_variant constructor_declarations ->
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constructor_declarations
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|> List.fold_left
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(fun acc (constructor_decl : Types.constructor_declaration) ->
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match constructor_decl.cd_args with
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| Cstr_tuple type_exprs ->
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type_exprs
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|> List.fold_left
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(fun acc type_expr ->
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acc
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@ extractRelevantTypesFromTypeExpr ~depth:1 type_expr)
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acc
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| Cstr_record label_declarations ->
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label_declarations
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|> List.fold_left
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(fun acc (label_decl : Types.label_declaration) ->
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acc
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@ extractRelevantTypesFromTypeExpr ~depth:1
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label_decl.ld_type)
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acc)
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[]
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| Type_abstract | Type_open -> [])
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in
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match input with
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| TypeExpr {typeExpr; name; env} ->
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let aliases = followTypeAliases [] typeExpr in
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let mainTypesRaw = TypeExpr {typeExpr; name; env} :: aliases in
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(* Extract related types from the final concrete type *)
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let finalConcreteType = findFinalConcreteType typeExpr in
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let relatedTypesRaw =
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extractRelevantTypesFromTypeExpr finalConcreteType
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in
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let mainTypes, relatedTypes =
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deduplicateAndRemoveAlreadyPresent mainTypesRaw relatedTypesRaw
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in
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{mainTypes; relatedTypes}
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| TypeDecl {typeDecl} ->
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let mainTypes = [input] in
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let relatedTypesRaw = extractRelevantTypesFromTypeDecl typeDecl in
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let _, relatedTypes =
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deduplicateAndRemoveAlreadyPresent mainTypes relatedTypesRaw
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in
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{mainTypes; relatedTypes}
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end

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