Method: SuperStruct.open

Defined in:

lib/mega/sstruct.rb

.open(*args) ⇒ Object

# File 'lib/mega/sstruct.rb', line 359

def SuperStruct.open(*args)
  klass = SuperStruct.new(*args)
  table = @table
  setsyms = @setsyms
  table = @table
  klass.class_eval do
    define_method(:method_missing) do |meth, *args|
      mname = meth.id2name
      if mname =~ /=$/
        getter = mname.chop
        setter = mname
      elsif mname =~ /\?$/
        raise NoMethodError  # ?-methods are not created automatically
      else
        getter = mname
        setter = mname + "="
      end
      gsym = getter.intern
      ssym = setter.intern
      ivar = "@" + getter
      setsyms << setter
      table << getter
      len = args.length
      if mname == getter
        klass.class_eval do                 # getter
          define_method(getter) do
            instance_variable_get(ivar)
          end
        end
      else
        klass.class_eval do                 # setter
          define_method(setter) do |*args|
            if len != 1
              raise ArgumentError, "Wrong # of arguments (#{len} for 1)", caller(1)
            end
            instance_variable_set(ivar,args[0])
            instance_variable_get(ivar)
          end
        end
      end
      if mname == setter
        self.send(setter,*args)
      else
        if len == 0
          self.send(getter)
        else
          raise NoMethodError, "Undefined method '#{mname}' for #{self}", caller(1)
        end
      end
    end
  end
  klass
end