Class: RuboCop::Cop::Lint::EmptyClass

Inherits:
Base
  • Object
show all
Defined in:
lib/rubocop/cop/lint/empty_class.rb

Overview

This cop checks for classes and metaclasses without a body. Such empty classes and metaclasses are typically an oversight or we should provide a comment to be clearer what we're aiming for.

Examples:

# bad
class Foo
end

class Bar
  class << self
  end
end

class << obj
end

# good
class Foo
  def do_something
    # ... code
  end
end

class Bar
  class << self
    attr_reader :bar
  end
end

class << obj
  attr_reader :bar
end

AllowComments: false (default)

# bad
class Foo
  # TODO: implement later
end

class Bar
  class << self
    # TODO: implement later
  end
end

class << obj
  # TODO: implement later
end

AllowComments: true

# good
class Foo
  # TODO: implement later
end

class Bar
  class << self
    # TODO: implement later
  end
end

class << obj
  # TODO: implement later
end

Constant Summary collapse

CLASS_MSG =
'Empty class detected.'
METACLASS_MSG =
'Empty metaclass detected.'

Constants inherited from Base

Base::RESTRICT_ON_SEND

Instance Attribute Summary

Attributes inherited from Base

#config, #processed_source

Instance Method Summary collapse

Methods inherited from Base

#add_global_offense, #add_offense, autocorrect_incompatible_with, badge, #callbacks_needed, callbacks_needed, #config_to_allow_offenses, #config_to_allow_offenses=, #cop_config, #cop_name, cop_name, department, documentation_url, exclude_from_registry, #excluded_file?, #external_dependency_checksum, inherited, #initialize, joining_forces, lint?, match?, #message, #offenses, #on_investigation_end, #on_new_investigation, #on_other_file, #ready, #relevant_file?, support_autocorrect?, support_multiple_source?, #target_rails_version, #target_ruby_version

Methods included from AutocorrectLogic

#autocorrect?, #autocorrect_enabled?, #autocorrect_requested?, #correctable?, #disable_uncorrectable?, #safe_autocorrect?

Methods included from IgnoredNode

#ignore_node, #ignored_node?, #part_of_ignored_node?

Methods included from Util

silence_warnings

Constructor Details

This class inherits a constructor from RuboCop::Cop::Base

Instance Method Details

#on_class(node) ⇒ Object


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# File 'lib/rubocop/cop/lint/empty_class.rb', line 76

def on_class(node)
  add_offense(node, message: CLASS_MSG) unless body_or_allowed_comment_lines?(node) ||
                                               node.parent_class
end

#on_sclass(node) ⇒ Object


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# File 'lib/rubocop/cop/lint/empty_class.rb', line 81

def on_sclass(node)
  add_offense(node, message: METACLASS_MSG) unless body_or_allowed_comment_lines?(node)
end