Class: Class

Inherits:
Object
  • Object
show all
Defined in:
lib/support/cattr_accessor.rb

Overview

Extends the class object with class and instance accessors for class attributes, just like the native attr* accessors for instance attributes.

Copyright © 2005 Tobias Lutke

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the “Software”), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Instance Method Summary collapse

Instance Method Details

#cattr_accessor(*syms) ⇒ Object 



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# File 'lib/support/cattr_accessor.rb', line 74

def cattr_accessor(*syms)
  cattr_reader(*syms)
  cattr_writer(*syms)
end

#cattr_reader(*syms) ⇒ Object

:nodoc:



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# File 'lib/support/cattr_accessor.rb', line 25

def cattr_reader(*syms)
  syms.each do |sym|
    class_eval <<-EOS
      if ! defined? @@#{sym.id2name}
        @@#{sym.id2name} = nil
      end
      
      def self.#{sym.id2name}
        @@#{sym}
      end

      def #{sym.id2name}
        @@#{sym}
      end

      def call_#{sym.id2name}
        case @@#{sym.id2name}
          when Symbol then send(@@#{sym})
          when Proc   then @@#{sym}.call(self)
          when String then @@#{sym}
          else nil
        end
      end
    EOS
  end
end

#cattr_writer(*syms) ⇒ Object 



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# File 'lib/support/cattr_accessor.rb', line 52

def cattr_writer(*syms)
  syms.each do |sym|
    class_eval <<-EOS
      if ! defined? @@#{sym.id2name}
        @@#{sym.id2name} = nil
      end
      
      def self.#{sym.id2name}=(obj)
        @@#{sym.id2name} = obj
      end

      def self.set_#{sym.id2name}(obj)
        @@#{sym.id2name} = obj
      end

      def #{sym.id2name}=(obj)
        @@#{sym} = obj
      end
    EOS
  end
end