view/config/standard_validators.rb

# standard_validators.rb: an assembly of pre-defined validators for
# Edmaru::Config::ConfigElement.
#
# Copyright (C) 2007 Takashi Nakamoto
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
# 02110-1301 USA.
#

module Edmaru::Config
  module Validators

    #This validator accept an arbitrary string.
    STRING_VALIDATOR = Proc.new{ |value|
      raise "Not an instance of String was passed." if value.class != String
    }

    #This validator accept objects included in the specified array.
    #To get a validator that accepts any one of "apple", "banana" or "orange",
    #call this method like the following:
    #
    # LIST_VALIDATOR(["apple", "banana", "orange"])
    def Validators.LIST_VALIDATOR(array)
      Proc.new{ |value|
        if !array.include?(value)
          raise "#{value} is invalid."
        end
      }
    end
  end
end