new

# File lib/irb/context.rb, line 21
    def initialize(irb, workspace = nil, input_method = nil, output_method = nil)
      @irb = irb
      if workspace
        @workspace = workspace
      else
        @workspace = WorkSpace.new
      end
      @thread = Thread.current if defined? Thread
#      @irb_level = 0

      # copy of default configuration
      @ap_name = IRB.conf[:AP_NAME]
      @rc = IRB.conf[:RC]
      @load_modules = IRB.conf[:LOAD_MODULES]

      @use_readline = IRB.conf[:USE_READLINE]
      @inspect_mode = IRB.conf[:INSPECT_MODE]

      self.math_mode = IRB.conf[:MATH_MODE] if IRB.conf[:MATH_MODE]
      self.use_tracer = IRB.conf[:USE_TRACER] if IRB.conf[:USE_TRACER]
      self.use_loader = IRB.conf[:USE_LOADER] if IRB.conf[:USE_LOADER]
      self.eval_history = IRB.conf[:EVAL_HISTORY] if IRB.conf[:EVAL_HISTORY]

      @ignore_sigint = IRB.conf[:IGNORE_SIGINT]
      @ignore_eof = IRB.conf[:IGNORE_EOF]

      @back_trace_limit = IRB.conf[:BACK_TRACE_LIMIT]
      
      self.prompt_mode = IRB.conf[:PROMPT_MODE]

      if IRB.conf[:SINGLE_IRB] or !defined?(JobManager)
        @irb_name = IRB.conf[:IRB_NAME]
      else
        @irb_name = "irb#"+IRB.JobManager.n_jobs.to_s
      end
      @irb_path = "(" + @irb_name + ")"

      case input_method
      when nil
        case use_readline?
        when nil
          if (defined?(ReadlineInputMethod) && STDIN.tty? &&
              IRB.conf[:PROMPT_MODE] != :INF_RUBY)
            @io = ReadlineInputMethod.new
          else
            @io = StdioInputMethod.new
          end
        when false
          @io = StdioInputMethod.new
        when true
          if defined?(ReadlineInputMethod)
            @io = ReadlineInputMethod.new
          else
            @io = StdioInputMethod.new
          end
        end

      when String
        @io = FileInputMethod.new(input_method)
        @irb_name = File.basename(input_method)
        @irb_path = input_method
      else
        @io = input_method
      end
      self.save_history = IRB.conf[:SAVE_HISTORY] if IRB.conf[:SAVE_HISTORY]

      if output_method
        @output_method = output_method
      else
        @output_method = StdioOutputMethod.new
      end

      @verbose = IRB.conf[:VERBOSE] 
      @echo = IRB.conf[:ECHO]
      if @echo.nil?
        @echo = true
      end
      @debug_level = IRB.conf[:DEBUG_LEVEL]
    end