Inlay Hints: better support for destructuring (#540)

* better support for destructuring

* update output test

Author: aspeddro

CHANGELOG.md

@@ -22,9 +22,9 @@
 #### :bug: Bug Fix
 
 - Fix Incorrect semantic highlighting of `external` declarations https://github.com/rescript-lang/rescript-vscode/pull/517
-
 - Fix issue where doc comment with nested comments inside is not shown properly on hover https://github.com/rescript-lang/rescript-vscode/pull/526
 - Fix server crashes when open file is removed from disk with inlayHints enabled https://github.com/rescript-lang/rescript-vscode/issues/538
+- Fix inlay hint for destructured record/array https://github.com/rescript-lang/rescript-vscode/issues/536
 
 ## v1.4.2
 

analysis/src/Commands.ml

@@ -394,8 +394,11 @@ let test ~path =
                                    indent indent newText)))
           | "dia" -> diagnosticSyntax ~path
           | "hin" ->
-            let line_start = 0 in
-            let line_end = 6 in
+            (* Get all inlay Hint between line 1 and n.
+               Don't get the first line = 0.
+            *)
+            let line_start = 1 in
+            let line_end = 34 in
             print_endline
               ("Inlay Hint " ^ path ^ " " ^ string_of_int line_start ^ ":"
              ^ string_of_int line_end);

analysis/src/Hint.ml

@@ -51,6 +51,15 @@ let inlay ~path ~pos ~maxLength ~debug =
       | _ -> processFunction e)
     | _ -> ()
   in
+  let rec processPattern (pat : Parsetree.pattern) =
+    match pat.ppat_desc with
+    | Ppat_tuple pl -> pl |> List.iter processPattern
+    | Ppat_record (fields, _) ->
+      fields |> List.iter (fun (_, p) -> processPattern p)
+    | Ppat_array fields -> fields |> List.iter processPattern
+    | Ppat_var {loc} -> push loc Type
+    | _ -> ()
+  in
   let value_binding (iterator : Ast_iterator.iterator)
       (vb : Parsetree.value_binding) =
     (match vb with
@@ -66,10 +75,8 @@ let inlay ~path ~pos ~maxLength ~debug =
        };
     } ->
       push vb.pvb_pat.ppat_loc Type
-    | {pvb_pat = {ppat_desc = Ppat_tuple tuples}} ->
-      List.iter
-        (fun (tuple : Parsetree.pattern) -> push tuple.ppat_loc Type)
-        tuples
+    | {pvb_pat = {ppat_desc = Ppat_tuple _}} -> processPattern vb.pvb_pat
+    | {pvb_pat = {ppat_desc = Ppat_record _}} -> processPattern vb.pvb_pat
     | {
      pvb_pat = {ppat_desc = Ppat_var _};
      pvb_expr = {pexp_desc = Pexp_fun (_, _, pat, e)};

analysis/tests/src/InlayHint.res

@@ -1,3 +1,4 @@
+let not_include = "Not Include"
 let string = "ReScript"
 let number = 1
 let float = 1.1
@@ -17,4 +18,19 @@ let tuple = ("ReScript", "lol")
 
 let (lang, _) = tuple
 
+type foo = {
+  name: string,
+  age: int,
+}
+
+let bar = () => ({name: "ReScript", age: 2}, tuple)
+let ({name, age}, t) = bar()
+
+let alice = {
+  name: "Alice",
+  age: 42,
+};
+
+let {name, age} = alice;
+
 //^hin

analysis/tests/src/expected/InlayHint.res.txt

@@ -1,36 +1,102 @@
-Inlay Hint src/InlayHint.res 0:6
+Inlay Hint src/InlayHint.res 1:34
 [{
-    "position": {"line": 5, "character": 15},
+    "position": {"line": 33, "character": 14},
     "label": ": int",
     "kind": 1,
     "paddingLeft": true,
     "paddingRight": false
 }, {
-    "position": {"line": 5, "character": 12},
+    "position": {"line": 33, "character": 9},
+    "label": ": string",
+    "kind": 1,
+    "paddingLeft": true,
+    "paddingRight": false
+}, {
+    "position": {"line": 28, "character": 9},
+    "label": ": foo",
+    "kind": 1,
+    "paddingLeft": true,
+    "paddingRight": false
+}, {
+    "position": {"line": 26, "character": 19},
+    "label": ": (string, string)",
+    "kind": 1,
+    "paddingLeft": true,
+    "paddingRight": false
+}, {
+    "position": {"line": 26, "character": 15},
+    "label": ": int",
+    "kind": 1,
+    "paddingLeft": true,
+    "paddingRight": false
+}, {
+    "position": {"line": 26, "character": 10},
+    "label": ": string",
+    "kind": 1,
+    "paddingLeft": true,
+    "paddingRight": false
+}, {
+    "position": {"line": 18, "character": 9},
+    "label": ": string",
+    "kind": 1,
+    "paddingLeft": true,
+    "paddingRight": false
+}, {
+    "position": {"line": 16, "character": 9},
+    "label": ": (string, string)",
+    "kind": 1,
+    "paddingLeft": true,
+    "paddingRight": false
+}, {
+    "position": {"line": 14, "character": 17},
+    "label": ": string",
+    "kind": 1,
+    "paddingLeft": true,
+    "paddingRight": false
+}, {
+    "position": {"line": 10, "character": 24},
     "label": ": int",
     "kind": 1,
     "paddingLeft": true,
     "paddingRight": false
 }, {
-    "position": {"line": 3, "character": 8},
+    "position": {"line": 8, "character": 10},
+    "label": ": int",
+    "kind": 1,
+    "paddingLeft": true,
+    "paddingRight": false
+}, {
+    "position": {"line": 6, "character": 15},
+    "label": ": int",
+    "kind": 1,
+    "paddingLeft": true,
+    "paddingRight": false
+}, {
+    "position": {"line": 6, "character": 12},
+    "label": ": int",
+    "kind": 1,
+    "paddingLeft": true,
+    "paddingRight": false
+}, {
+    "position": {"line": 4, "character": 8},
     "label": ": char",
     "kind": 1,
     "paddingLeft": true,
     "paddingRight": false
 }, {
-    "position": {"line": 2, "character": 9},
+    "position": {"line": 3, "character": 9},
     "label": ": float",
     "kind": 1,
     "paddingLeft": true,
     "paddingRight": false
 }, {
-    "position": {"line": 1, "character": 10},
+    "position": {"line": 2, "character": 10},
     "label": ": int",
     "kind": 1,
     "paddingLeft": true,
     "paddingRight": false
 }, {
-    "position": {"line": 0, "character": 10},
+    "position": {"line": 1, "character": 10},
     "label": ": string",
     "kind": 1,
     "paddingLeft": true,