Expose error tolerant parser through public api

Closes #87

lib/elixir_sense.ex

@@ -375,4 +375,25 @@ defmodule ElixirSense do
         []
     end
   end
+
+  @doc ~S"""
+  Provides an error tolerant parser
+
+  ## Example
+
+      iex> code = ~S'''
+      ...> defmodule do
+      ...> end
+      ...> '''
+      iex> ElixirSense.string_to_quoted(code, 1)
+      {:ok, {:defmodule, [line: 1, column: 1], [[do: {:__block__, [], []}]]}}
+  """
+  @spec string_to_quoted(String.t(), pos_integer | nil, non_neg_integer) ::
+          {:ok, Macro.t()} | {:error, {line :: pos_integer(), term(), term()}}
+  def string_to_quoted(source, cursor_line_number \\ nil, error_threshold \\ 6) do
+    case Parser.string_to_ast(source, error_threshold, cursor_line_number) do
+      {:ok, ast, _source} -> {:ok, ast}
+      other -> other
+    end
+  end
 end

lib/elixir_sense/core/parser.ex

@@ -107,7 +107,7 @@ defmodule ElixirSense.Core.Parser do
     }
   end
 
-  defp string_to_ast(source, errors_threshold, cursor_line_number, original_error \\ nil) do
+  def string_to_ast(source, errors_threshold, cursor_line_number, original_error \\ nil) do
     case Code.string_to_quoted(source, columns: true) do
       {:ok, ast} ->
         {:ok, ast, source}

lib/elixir_sense/server/request_handler.ex

@@ -21,6 +21,10 @@ defmodule ElixirSense.Server.RequestHandler do
     ElixirSense.suggestions(buffer, line, column)
   end
 
+  def handle_request("string_to_quoted", %{"buffer" => buffer} = args) do
+    ElixirSense.suggestions(buffer, args["cursor_line"], args["error_threshold"] || 6)
+  end
+
   def handle_request("expand_full", %{
         "buffer" => buffer,
         "selected_code" => selected_code,