# File tk/lib/tk/validation.rb, line 271
  def self._config_keys
    # array of config-option key (string or symbol)
    ['vcmd', 'validatecommand', 'invcmd', 'invalidcommand']
  end

# File tk/lib/tk/validation.rb, line 313
  def initialize(cmd = Proc.new, *args)
    _initialize_for_cb_class(self.class::ValidateArgs, cmd, *args)
  end

# File tk/lib/tk/validation.rb, line 276
  def _initialize_for_cb_class(klass, cmd = Proc.new, *args)
    extra_args_tbl = klass._get_extra_args_tbl

    if args.compact.size > 0
      args = args.join(' ')
      keys = klass._get_subst_key(args)
      if cmd.kind_of?(String)
        id = cmd
      elsif cmd.kind_of?(TkCallbackEntry)
        @id = install_cmd(cmd)
      else
        @id = install_cmd(proc{|*arg|
             ex_args = []
             extra_args_tbl.reverse_each{|conv| ex_args << conv.call(arg.pop)}
             klass.ret_val(cmd.call(
               *(ex_args.concat(klass.scan_args(keys, arg)))
             ))
        }) + ' ' + args
      end
    else
      keys, args = klass._get_all_subst_keys
      if cmd.kind_of?(String)
        id = cmd
      elsif cmd.kind_of?(TkCallbackEntry)
        @id = install_cmd(cmd)
      else
        @id = install_cmd(proc{|*arg|
             ex_args = []
             extra_args_tbl.reverse_each{|conv| ex_args << conv.call(arg.pop)}
             klass.ret_val(cmd.call(
               *(ex_args << klass.new(*klass.scan_args(keys, arg)))
             ))
        }) + ' ' + args
      end
    end
  end

# File tk/lib/tk/validation.rb, line 317
  def to_eval
    @id
  end