Add support for 1.19 'not in' token

Author: lukaszsamson

apps/language_server/lib/language_server/providers/folding_range/token.ex

@@ -29,6 +29,11 @@ defmodule ElixirLS.LanguageServer.Providers.FoldingRange.Token do
           {a, {b1, b2, b3}, c} ->
             {a, {b1 - 1, b2 - 1, b3}, c}
 
+          # Handle 'not in' operator token format from Elixir 1.19+
+          # {:in_op, {start_line, start_col, nil}, :"not in", {end_line, end_col, nil}}
+          {:in_op, {b1, b2, b3}, :"not in", {_d1, _d2, _d3}} ->
+            {:in_op, {b1 - 1, b2 - 1, b3}, :"not in"}
+
           {:sigil, {b1, b2, b3}, _, _, _, _, delimiter} ->
             {:sigil, {b1 - 1, b2 - 1, b3}, delimiter}
 

apps/language_server/test/providers/folding_range_test.exs

@@ -526,6 +526,24 @@ defmodule ElixirLS.LanguageServer.Providers.FoldingRangeTest do
       assert compare_condensed_ranges(ranges, expected, text)
     end
 
+    @tag text: """
+         defmodule A do
+           def check(value) do
+             if value not in [1, 2, 3] do
+               :ok
+             end
+           end
+         end
+         """
+    test "handles 'not in' operator from Elixir 1.19+", %{
+      ranges_result: ranges_result,
+      text: text
+    } do
+      assert {:ok, ranges} = ranges_result
+      expected = [{0, 5, "region"}, {1, 4, "region"}, {2, 3, "region"}]
+      assert compare_condensed_ranges(ranges, expected, text)
+    end
+
     defp fold_text(%{text: _text} = context) do
       ranges_result = FoldingRange.provide(context)
       {:ok, Map.put(context, :ranges_result, ranges_result)}

apps/language_server/test/providers/selection_ranges_test.exs

@@ -1126,4 +1126,24 @@ defmodule ElixirLS.LanguageServer.Providers.SelectionRangesTest do
 
     get_ranges(text, 1, 2)
   end
+
+  test "handles 'not in' operator from Elixir 1.19+" do
+    text = """
+    defmodule Test do
+      def check(value) do
+        if value not in [1, 2, 3] do
+          :ok
+        end
+      end
+    end
+    """
+
+    # Test selection range on the 'not in' operator
+    ranges = get_ranges(text, 2, 14)
+
+    # Verify that we get ranges without crashing
+    assert length(ranges) > 0
+    # Full file range should be present
+    assert_range(ranges, range(0, 0, 7, 0))
+  end
 end