class ChefCLI::Policyfile::DSL

def eval_policyfile(policyfile_string)
  @policyfile_filename = policyfile_filename
  instance_eval(policyfile_string, policyfile_filename)
  validate!
  self
rescue SyntaxError => e
  @errors << "Invalid Ruby syntax in Policyfile '#{policyfile_filename}':\n\n#{e.message}"
rescue SignalException, SystemExit
  # allow signal from kill, ctrl-C, etc. to bubble up:
  raise
rescue Exception => e
  error_message = "Evaluation of policyfile '#{policyfile_filename}' raised an exception\n"
  error_message << "  Exception: #{e.class.name} \"#{e}\"\n\n"
  trace = filtered_bt(policyfile_filename, e)
  error_message << "  Relevant Code:\n"
  error_message << "    #{error_context(policyfile_string, policyfile_filename, e)}\n\n"
  unless trace.empty?
    error_message << "  Backtrace:\n"
    # TODO: need a way to disable filtering
    error_message << filtered_bt(policyfile_filename, e).inject("") { |formatted_trace, line| formatted_trace << "    #{line}\n" }
  end
  @errors << error_message
end