Module: Wongi::Engine::CoreExt::ClassMethods

Defined in:
lib/wongi-engine/core_ext.rb

Instance Method Summary collapse

Instance Method Details

#abstract(name) ⇒ Object 



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# File 'lib/wongi-engine/core_ext.rb', line 49

def abstract name
  define_method name do |*args|
    raise NoMethodError.new "#{name} is not implemented for #{self.class.name}", name
  end
end

#attr_predicate(*names) ⇒ Object 



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# File 'lib/wongi-engine/core_ext.rb', line 7

def attr_predicate *names

  names_hash = names.inject( {} ) do |hash, element|
    if Hash === element
      hash.merge element
    else
      hash[element] = false
      hash
    end
  end

  names_hash.each do |name, def_value|

    varname = "@#{name}".to_sym
    predname = "#{name}?".to_sym
    setname = "#{name}=".to_sym
    exclname = "#{name}!".to_sym
    noexclname = "no_#{name}!".to_sym

    define_method predname do
      if instance_variable_defined?( varname )
        instance_variable_get( varname )
      else
        def_value
      end
    end

    define_method setname do |newvalue|
      instance_variable_set( varname, newvalue == true )
    end

    define_method exclname do
      instance_variable_set( varname, true )
    end

    define_method noexclname do
      instance_variable_set( varname, false )
    end

  end
end