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Class: RuboCop::Cop::Style::ClassMethodsDefinitions

Relationships & Source Files
Super Chains via Extension / Inclusion / Inheritance
Class Chain:
self, ::RuboCop::Cop::AutoCorrector, ::RuboCop::Cop::Base, ::RuboCop::ExcludeLimit, NodePattern::Macros, RuboCop::AST::Sexp
Instance Chain:
Inherits: RuboCop::Cop::Base
Defined in: lib/rubocop/cop/style/class_methods_definitions.rb

Overview

Enforces using def self.method_name or class << self to define class methods.

Examples:

EnforcedStyle: def_self (default)

# bad
class SomeClass
  class << self
    attr_accessor :class_accessor

    def class_method
      # ...
    end
  end
end

# good
class SomeClass
  def self.class_method
    # ...
  end

  class << self
    attr_accessor :class_accessor
  end
end

# good - contains private method
class SomeClass
  class << self
    attr_accessor :class_accessor

    private

    def private_class_method
      # ...
    end
  end
end

EnforcedStyle: self_class

# bad
class SomeClass
  def self.class_method
    # ...
  end
end

# good
class SomeClass
  class << self
    def class_method
      # ...
    end
  end
end

Constant Summary

::RuboCop::Cop::Base - Inherited

EMPTY_OFFENSES, RESTRICT_ON_SEND

::RuboCop::Cop::ConfigurableEnforcedStyle - Included

SYMBOL_TO_STRING_CACHE

::RuboCop::Cop::VisibilityHelp - Included

VISIBILITY_SCOPES

::RuboCop::Cop::RangeHelp - Included

BYTE_ORDER_MARK, NOT_GIVEN

Class Attribute Summary

::RuboCop::Cop::AutoCorrector - Extended

::RuboCop::Cop::Base - Inherited

.gem_requirements, .lint?,
.support_autocorrect?

Returns if class supports autocorrect.

.support_multiple_source?

Override if your cop should be called repeatedly for multiple investigations Between calls to on_new_investigation and on_investigation_end, the result of processed_source will remain constant.

.builtin?

Class Method Summary

::RuboCop::Cop::Base - Inherited

.autocorrect_incompatible_with

List of cops that should not try to autocorrect at the same time as this cop.

.badge

Naming.

.callbacks_needed, .cop_name, .department,
.documentation_url

Cops (other than builtin) are encouraged to implement this.

.exclude_from_registry

Call for abstract Cop classes.

.inherited,
.joining_forces

Override and return the Force class(es) you need to join.

.match?

Returns true if the cop name or the cop namespace matches any of the given names.

.new,
.requires_gem

Register a version requirement for the given gem name.

.restrict_on_send

::RuboCop::ExcludeLimit - Extended

exclude_limit

Sets up a configuration option to have an exclude limit tracked.

transform

Instance Attribute Summary

Instance Method Summary

::RuboCop::Cop::RangeHelp - Included

#add_range, #column_offset_between,
#contents_range

A range containing only the contents of a literal with delimiters (e.g.

#directions,
#effective_column

Returns the column attribute of the range, except if the range is on the first line and there’s a byte order mark at the beginning of that line, in which case 1 is subtracted from the column value.

#final_pos, #move_pos, #move_pos_str, #range_between, #range_by_whole_lines, #range_with_comments, #range_with_comments_and_lines, #range_with_surrounding_comma, #range_with_surrounding_space, #source_range

::RuboCop::Cop::VisibilityHelp - Included

::RuboCop::Cop::CommentsHelp - Included

#comments_contain_disables?, #comments_in_range, #contains_comments?, #source_range_with_comment, #begin_pos_with_comment, #buffer, #end_position_for,
#find_end_line

Returns the end line of a node, which might be a comment and not part of the AST End line is considered either the line at which another node starts, or the line at which the parent node ends.

#start_line_position

::RuboCop::Cop::ConfigurableEnforcedStyle - Included

::RuboCop::Cop::Base - Inherited

#add_global_offense

Adds an offense that has no particular location.

#add_offense

Adds an offense on the specified range (or node with an expression) Unless that offense is disabled for this range, a corrector will be yielded to provide the cop the opportunity to autocorrect the offense.

#begin_investigation

Called before any investigation.

#callbacks_needed,
#cop_config

Configuration Helpers.

#cop_name, #excluded_file?,
#external_dependency_checksum

This method should be overridden when a cop’s behavior depends on state that lives outside of these locations:

#inspect,
#message

Gets called if no message is specified when calling add_offense or add_global_offense Cops are discouraged to override this; instead pass your message directly.

#name

Alias for Base#cop_name.

#offenses,
#on_investigation_end

Called after all on_…​

#on_new_investigation

Called before all on_…​

#on_other_file

Called instead of all on_…​

#parse

There should be very limited reasons for a Cop to do it’s own parsing.

#parser_engine,
#ready

Called between investigations.

#relevant_file?, #target_rails_version, #target_ruby_version, #annotate, #apply_correction, #attempt_correction,
#callback_argument

Reserved for Cop::Cop.

#complete_investigation

Called to complete an investigation.

#correct, #current_corrector,
#current_offense_locations

Reserved for Commissioner:

#current_offenses, #currently_disabled_lines, #custom_severity, #default_severity, #disable_uncorrectable, #enabled_line?, #file_name_matches_any?, #find_message, #find_severity, #range_for_original, #range_from_node_or_range, #reset_investigation, #use_corrector

::RuboCop::Cop::AutocorrectLogic - Included

::RuboCop::Cop::IgnoredNode - Included

Constructor Details

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

Instance Attribute Details

#def_self_style?Boolean (readonly, private)

[ GitHub ]

  
# File 'lib/rubocop/cop/style/class_methods_definitions.rb', line 91

def def_self_style?
  style == :def_self
end

Instance Method Details

#all_methods_public?(sclass_node) ⇒ Boolean (private)

[ GitHub ]

  
# File 'lib/rubocop/cop/style/class_methods_definitions.rb', line 95

def all_methods_public?(sclass_node)
  def_nodes = def_nodes(sclass_node)
  return false if def_nodes.empty?

  def_nodes.all? { |def_node| node_visibility(def_node) == :public }
end

#autocorrect_sclass(node, corrector) (private)

[ GitHub ]

  
# File 'lib/rubocop/cop/style/class_methods_definitions.rb', line 115

def autocorrect_sclass(node, corrector)
  rewritten_defs = []

  def_nodes(node).each do |def_node|
    next unless node_visibility(def_node) == :public

    range, source = extract_def_from_sclass(def_node, node)

    corrector.remove(range)
    rewritten_defs << source
  end

  if sclass_only_has_methods?(node)
    corrector.remove(node)
    rewritten_defs.first&.strip!
  else
    corrector.insert_after(node, "\n")
  end

  corrector.insert_after(node, rewritten_defs.join("\n"))
end

#def_nodes(sclass_node) (private)

[ GitHub ]

  
# File 'lib/rubocop/cop/style/class_methods_definitions.rb', line 102

def def_nodes(sclass_node)
  sclass_def = sclass_node.body
  return [] unless sclass_def

  if sclass_def.def_type?
    [sclass_def]
  elsif sclass_def.begin_type?
    sclass_def.each_child_node(:def).to_a
  else
    []
  end
end

#extract_def_from_sclass(def_node, sclass_node) (private)

[ GitHub ]

  
# File 'lib/rubocop/cop/style/class_methods_definitions.rb', line 141

def extract_def_from_sclass(def_node, sclass_node)
  range = source_range_with_comment(def_node)
  source = range.source.sub!(
    "def #{def_node.method_name}",
    "def self.#{def_node.method_name}"
  )

  source = source.gsub(/^ {#{indentation_diff(def_node, sclass_node)}}/, '')
  [range, source.chomp]
end

#indentation_diff(node1, node2) (private)

[ GitHub ]

  
# File 'lib/rubocop/cop/style/class_methods_definitions.rb', line 152

def indentation_diff(node1, node2)
  node1.loc.column - node2.loc.column
end

#on_defs(node)

[ GitHub ]

  
# File 'lib/rubocop/cop/style/class_methods_definitions.rb', line 81

def on_defs(node)
  return if def_self_style?
  return unless node.receiver.self_type?

  message = format(MSG, preferred: 'class << self')
  add_offense(node, message: message)
end

#on_sclass(node)

[ GitHub ]

  
# File 'lib/rubocop/cop/style/class_methods_definitions.rb', line 71

def on_sclass(node)
  return unless def_self_style?
  return unless node.identifier.self_type?
  return unless all_methods_public?(node)

  add_offense(node, message: MSG_SCLASS) do |corrector|
    autocorrect_sclass(node, corrector)
  end
end

#sclass_only_has_methods?(node) ⇒ Boolean (private)

[ GitHub ]

  
# File 'lib/rubocop/cop/style/class_methods_definitions.rb', line 137

def sclass_only_has_methods?(node)
  node.body.def_type? || node.body.each_child_node.all?(&:def_type?)
end