# File lib/ruby-debug/commands/jump.rb, line 20
    def execute
      unless @state.context.respond_to?(:jump)
        print_msg "Not implemented"
        return
      end
      if !@match[1]
        print_msg "\"jump\" must be followed by a line number"
        return
      end
      if !numeric?(@match[1])
        print_msg "Bad line number: " + @match[1]
        return
      end
      line = @match[1].to_i
      line = @state.context.frame_line(0) + line if @match[1][0] == '+' or @match[1][0] == '-'
      if line == @state.context.frame_line(0)
        return
      end
      file = @match[2]
      file = @state.context.frame_file(file.to_i) if numeric?(file)
      file = @state.context.frame_file(0) if !file
      case @state.context.jump(line, file)
      when 0
        @state.proceed
        return
      when 1
        print_msg "Not possible to jump from here"
      when 2
        print_msg "Couldn't find debugged frame"
      when 3
        print_msg "Couldn't find active code at " + file + ":" + line.to_s
      else
        print_msg "Unknown error occurred"
      end
      @printer.print_at_line(@state.context, @state.context.frame_file, @state.context.frame_line)
    end