PP::ObjectMixin

A default pretty printing method for general objects. It calls pretty_print_instance_variables to list instance variables.

If self has a customized (redefined) inspect method, the result of self.inspect is used but it obviously has no line break hints.

This module provides predefined pretty_print methods for some of the most commonly used built-in classes for convenience.

 
               # File pp.rb, line 257
def pretty_print(q)
  if /\(Kernel\)#/ !~ method(:inspect).inspect
    q.text self.inspect
  elsif /\(Kernel\)#/ !~ method(:to_s).inspect && instance_variables.empty?
    q.text self.to_s
  else
    q.pp_object(self)
  end
end
            

A default pretty printing method for general objects that are detected as part of a cycle.

 
               # File pp.rb, line 269
def pretty_print_cycle(q)
  q.object_address_group(self) {
    q.breakable
    q.text '...'
  }
end
            

Is inspect implementation using pretty_print. If you implement pretty_print, it can be used as follows.

alias inspect pretty_print_inspect

However, doing this requires that every class that inspect is called on implement pretty_print, or a RuntimeError will be raised.

 
               # File pp.rb, line 291
def pretty_print_inspect
  if /\(PP::ObjectMixin\)#/ =~ method(:pretty_print).inspect
    raise "pretty_print is not overridden for #{self.class}"
  end
  PP.singleline_pp(self, '')
end
            

Returns a sorted array of instance variable names.

This method should return an array of names of instance variables as symbols or strings as: +[:@a, :@b]+.

 
               # File pp.rb, line 280
def pretty_print_instance_variables
  instance_variables.sort
end