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#
#   irb/ext/cb.rb -
#   	$Release Version: 0.9.6$
#   	$Revision: 38515 $
#   	by Keiju ISHITSUKA(keiju@ruby-lang.org)
#
# --
#
#
#

module IRB # :nodoc:
  class Context

    # Inherited from +TOPLEVEL_BINDING+.
    def home_workspace
      if defined? @home_workspace
	@home_workspace
      else
	@home_workspace = @workspace
      end
    end

    # Changes the current workspace to given object or binding.
    #
    # If the optional argument is omitted, the workspace will be
    # #home_workspace which is inherited from +TOPLEVEL_BINDING+ or the main
    # object, <code>IRB.conf[:MAIN_CONTEXT]</code> when irb was initialized.
    #
    # See IRB::WorkSpace.new for more information.
    def change_workspace(*_main)
      if _main.empty?
	@workspace = home_workspace
	return main
      end

      @workspace = WorkSpace.new(_main[0])

      if !(class<<main;ancestors;end).include?(ExtendCommandBundle)
	main.extend ExtendCommandBundle
      end
    end

#     def change_binding(*_main)
#       back = @workspace
#       @workspace = WorkSpace.new(*_main)
#       unless _main.empty?
# 	begin
# 	  main.extend ExtendCommandBundle
# 	rescue
# 	  print "can't change binding to: ", main.inspect, "\n"
# 	  @workspace = back
# 	  return nil
# 	end
#       end
#       @irb_level += 1
#       begin
# 	catch(:SU_EXIT) do
# 	  @irb.eval_input
# 	end
#       ensure
# 	@irb_level -= 1
#  	@workspace = back
#       end
#     end
#     alias change_workspace change_binding
  end
end