be more safe with line splitting

Author: lukaszsamson

lib/elixir_sense/core/normalized/code/elixir_sense_fragment.ex

@@ -536,7 +536,7 @@ defmodule ElixirSense.Core.Normalized.Code.ElixirSense.Fragment do
   def surround_context(binary, {line, column}, opts) when is_binary(binary) do
     binary
     |> String.split("\n")
-    |> Enum.at(line - 1, ~c"")
+    |> Enum.at(line - 1, "")
     |> String.to_charlist()
     |> position_surround_context(line, column, opts)
   end

lib/elixir_sense/core/parser.ex

@@ -360,7 +360,7 @@ defmodule ElixirSense.Core.Parser do
 
     case source
          |> Source.split_lines()
-         |> Enum.at(line - 1)
+         |> Enum.at(line - 1, "")
          |> Tokenizer.tokenize()
          |> Enum.at(-1) do
       {:identifier, _, ident} when ident in [:with, :for] ->

lib/elixir_sense/core/source.ex

@@ -718,7 +718,7 @@ defmodule ElixirSense.Core.Source do
       {line, column, _} ->
         prefix
         |> split_lines
-        |> Enum.at(line - 1)
+        |> Enum.at(line - 1, "")
         |> String.slice((column + 1)..-1//1)
     end
   end