extract_source

# File actionpack/lib/action_dispatch/middleware/exception_wrapper.rb, line 306
      def extract_source(trace)
        spot = trace.spot(@exception)

        if spot
          line = spot[:first_lineno]
          code = extract_source_fragment_lines(spot[:script_lines], line)

          if line == spot[:last_lineno]
            code[line] = [
              code[line][0, spot[:first_column]],
              code[line][spot[:first_column]...spot[:last_column]],
              code[line][spot[:last_column]..-1],
            ]
          end

          return {
            code: code,
            line_number: line
          }
        end

        file, line_number = extract_file_and_line_number(trace)

        {
          code: source_fragment(file, line_number),
          line_number: line_number
        }
      end