Class: LivingDocument::CodeEvaluator

Inherits:
Object
  • Object
show all
Includes:
MemoWise
Defined in:
lib/living_document/code_evaluator.rb

Instance Method Summary collapse

Constructor Details

#initialize(code:) ⇒ CodeEvaluator

Returns a new instance of CodeEvaluator.



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# File 'lib/living_document/code_evaluator.rb', line 6

def initialize(code:)
  @code = code.gsub(/^=begin\b.*?^=end\n/m, '')

  @known_erroring_segment_indexes = []
  @random_seed = rand(1_000_000_000)

  $printed_output_last_run = ''
end

Instance Method Details

#evaluated_code ⇒ Object 



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# File 'lib/living_document/code_evaluator.rb', line 15

def evaluated_code
  save_original_stdout

  Timecop.freeze do
    printed_code_segments.each_with_index do |printed_code_segment, index|
      $printed_output = ''
      set_up_capturing_stdout

      result =
        begin
          # We need to namespace any constants that would otherwise leak and persist globally.
          new_namespace.
            instance_eval(code_to_eval(index)).
            inspect.
            squish.
            then do |evaluated_result|
              if newly_printed_output.present?
                result_for_printed_output
              else
                formatted_evaluated_result(evaluated_result)
              end
            end
        rescue => error
          @known_erroring_segment_indexes << index

          "raises #{error.class} (#{error.message})"
        end

      remember_printed_output

      swap_in_evaluated_code(printed_code_segment, result)
    end
  end

  @code
ensure
  restore_original_stdout
end