Fix get_range for interpolation nodes

lib/sourceror/range.ex

@@ -297,6 +297,14 @@ defmodule Sourceror.Range do
     %{start: start_pos, end: end_pos}
   end
 
+  # Charlist interpolation node
+  defp do_get_range({{:., _, [Kernel, :to_string]}, meta, _}) do
+    start_pos = Keyword.take(meta, [:line, :column])
+    end_pos = Keyword.update!(meta[:closing], :column, &(&1 + 1))
+
+    %{start: start_pos, end: end_pos}
+  end
+
   # Qualified call
   defp do_get_range({{:., _, [_left, right]}, _meta, []} = quoted) when is_atom(right) do
     get_range_for_qualified_call_without_arguments(quoted)
@@ -333,6 +341,21 @@ defmodule Sourceror.Range do
     end
   end
 
+  # Interpolation
+  defp do_get_range(
+         {:"::", meta,
+          [
+            {{:., _, [Kernel, :to_string]}, end_meta, _},
+            _
+          ]}
+       ) do
+    start_pos = [line: meta[:line], column: meta[:column]]
+
+    end_pos = Keyword.update!(end_meta[:closing], :column, &(&1 + 1))
+
+    %{start: start_pos, end: end_pos}
+  end
+
   # Binary operators
   defp do_get_range({op, _, [left, right]}) when is_binary_op(op) do
     get_range_for_pair(left, right)

test/range_test.exs

@@ -204,6 +204,30 @@ defmodule SourcerorTest.RangeTest do
                |> String.trim_trailing()
     end
 
+    test "child of string with interpolations" do
+      code = ~S"""
+      "foo#{
+        2
+        }bar"
+      """
+
+      string =
+        code
+        |> Sourceror.parse_string!()
+        |> Sourceror.Zipper.zip()
+
+      interpolation =
+        string |> Sourceror.Zipper.down() |> Sourceror.Zipper.right() |> Sourceror.Zipper.node()
+
+      assert decorate(code, Sourceror.get_range(interpolation)) ==
+               ~S"""
+               "foo«#{
+                 2
+                 }»bar"
+               """
+               |> String.trim_trailing()
+    end
+
     test "charlists" do
       code = ~S/'foo'/
       assert decorate(code, to_range(code)) == "«'foo'»"
@@ -298,6 +322,35 @@ defmodule SourcerorTest.RangeTest do
                |> String.trim_trailing()
     end
 
+    test "child of charlists with interpolations" do
+      code = ~S"""
+      'foo#{
+        2
+        }bar'
+      """
+
+      charlist =
+        code
+        |> Sourceror.parse_string!()
+        |> Sourceror.Zipper.zip()
+
+      interpolation =
+        charlist
+        |> Sourceror.Zipper.down()
+        |> Sourceror.Zipper.right()
+        |> Sourceror.Zipper.down()
+        |> Sourceror.Zipper.right()
+        |> Sourceror.Zipper.node()
+
+      assert decorate(code, Sourceror.get_range(interpolation)) ==
+               ~S"""
+               'foo«#{
+                 2
+                 }»bar'
+               """
+               |> String.trim_trailing()
+    end
+
     test "atoms" do
       code = ~S/:foo/
       assert decorate(code, to_range(code)) == "«:foo»"