Robot Has No Heart

Xavier Shay blogs here

A robot that does not have a heart

YAML persistence

Fixed up my persistence code to not have to specify variables as an array, and committed my changes to CVS. Funny that on the day I got developer access to clxmlserial, I switched it out of my project in favour of YAML. Of course, I need to add a persistent attribute to that also, but it works a little different from XML:

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class Object
  def self._persist klass
    begin
      @@persist
    rescue
      @@persist = {}
    end
    @@persist[klass] = [] if !@@persist[klass]
    @@persist[klass]
  end

  def self._persist_with_parent klass
    begin
      @@persist
    rescue
      @@persist = {}
    end
    p = nil
    while (!p) && klass
      p = @@persist[klass.to_s]      
      klass = klass.superclass
    end
    p
  end

  def self.persistent *var
    p = self._persist(self.to_s)
    for i in (0..var.length-1)
      var[i] = var[i].to_s
    end
    p.concat(var)
  end

  def to_yaml ( opts = {} )       
    p = self.class._persist_with_parent(self.class)
   
    if p.size > 0
      YAML::quick_emit( object_id, opts ) do |out|
        out.map( taguri, to_yaml_style ) do |map|
          p.each do |m|
            map.add( m, instance_variable_get( '@' + m ) )
          end
        end
      end
    else
      YAML::quick_emit( object_id, opts ) do |out|
        out.map( taguri, to_yaml_style ) do |map|
                                  to_yaml_properties.each do |m|
            map.add( m[1..-1], instance_variable_get( m ) )
          end
        end
      end
    end
  end

  def save(filename)
    File.open( filename + '.yaml', 'w' ) do |out|
      YAML.dump( self, out )
    end
  end
end
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