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Class: RuboCop::Cop::Style::BisectedAttrAccessor

Relationships & Source Files
Namespace Children
Classes:
Macro
Super Chains via Extension / Inclusion / Inheritance
Class Chain:
self, ::RuboCop::Cop::AutoCorrector, ::RuboCop::Cop::Base, ::RuboCop::ExcludeLimit, NodePattern::Macros, RuboCop::AST::Sexp
Instance Chain:
self, ::RuboCop::Cop::RangeHelp, ::RuboCop::Cop::Base, ::RuboCop::Cop::AutocorrectLogic, ::RuboCop::Cop::IgnoredNode, ::RuboCop::Util, RuboCop::AST::Sexp
Inherits: RuboCop::Cop::Base
Defined in: lib/rubocop/cop/style/bisected_attr_accessor.rb,
lib/rubocop/cop/style/bisected_attr_accessor/macro.rb

Overview

Checks for places where attr_reader and attr_writer for the same method can be combined into single attr_accessor.

Examples:

# bad
class Foo
  attr_reader :bar
  attr_writer :bar
end

# good
class Foo
  attr_accessor :bar
end

Constant Summary

::RuboCop::Cop::Base - Inherited

EMPTY_OFFENSES, RESTRICT_ON_SEND

::RuboCop::Cop::RangeHelp - Included

BYTE_ORDER_MARK, NOT_GIVEN

Class Attribute Summary

::RuboCop::Cop::AutoCorrector - Extended

support_autocorrect?

::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

::RuboCop::Cop::Base - Inherited

#active_support_extensions_enabled?, #always_autocorrect?, #config, #config_to_allow_offenses, #config_to_allow_offenses=, #contextual_autocorrect?, #processed_source, #target_satisfies_all_gem_version_requirements?

::RuboCop::Cop::AutocorrectLogic - Included

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

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::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

#disable_offense, #disable_offense_at_end_of_line, #disable_offense_before_and_after, #disable_offense_with_eol_or_surround_comment, #max_line_length,
#range_by_lines

Expand the given range to include all of any lines it covers.
#range_of_first_line, #surrounding_heredoc, #surrounding_percent_array

::RuboCop::Cop::IgnoredNode - Included

#ignore_node, #ignored_node?, #part_of_ignored_node?, #ignored_nodes

Constructor Details

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

Instance Method Details

#after_class(class_node) Also known as: #after_sclass, #after_module

Each offending macro is captured and registered in on_class but correction happens in after_class because a macro might have multiple attributes rewritten from it

[ GitHub ] 

  


# File 'lib/rubocop/cop/style/bisected_attr_accessor.rb', line 55



def after_class(class_node)
  @macros_to_rewrite[class_node].each do |macro|
    node = macro.node
    range = range_by_whole_lines(node.source_range, include_final_newline: true)

    correct(range) do |corrector|
      if macro.writer?
        correct_writer(corrector, macro, node, range)
      else
        correct_reader(corrector, macro, node, range)
      end
    end
  end
end


  








  

    #after_module(class_node)  
  



  

    


Alias for #after_class.



  



  [ GitHub ]


  

  


# File 'lib/rubocop/cop/style/bisected_attr_accessor.rb', line 70



alias after_module after_class


  








  

    #after_sclass(class_node)  
  



  

    


Alias for #after_class.



  



  [ GitHub ]


  

  


# File 'lib/rubocop/cop/style/bisected_attr_accessor.rb', line 69



alias after_sclass after_class


  








  

    #correct_reader(corrector, macro, node, range)   (private)
  

  [ GitHub ]


  

  


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



def correct_reader(corrector, macro, node, range)
  attr_accessor = "attr_accessor #{macro.bisected_names.join(', ')}\n"

  if macro.all_bisected?
    corrector.replace(range, "#{indent(node)}#{attr_accessor}")
  else
    correction = "#{indent(node)}attr_reader #{macro.rest.join(', ')}"
    corrector.insert_before(node, attr_accessor)
    corrector.replace(node, correction)
  end
end


  








  

    #correct_writer(corrector, macro, node, range)   (private)
  

  [ GitHub ]


  

  


# File 'lib/rubocop/cop/style/bisected_attr_accessor.rb', line 114



def correct_writer(corrector, macro, node, range)
  if macro.all_bisected?
    corrector.remove(range)
  else
    correction = "attr_writer #{macro.rest.join(', ')}"
    corrector.replace(node, correction)
  end
end


  








  

    #find_bisection(macros)   (private)
  

  [ GitHub ]


  

  


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



def find_bisection(macros)
  # Find which attributes are defined in both readers and writers so that they
  # can be replaced with accessors.
  readers, writers = macros.partition(&:reader?)
  readers.flat_map(&:attr_names) & writers.flat_map(&:attr_names)
end


  








  

    #find_macros(class_def)   (private)
  

  [ GitHub ]


  

  


# File 'lib/rubocop/cop/style/bisected_attr_accessor.rb', line 74



def find_macros(class_def)
  # Find all the macros (`attr_reader`, `attr_writer`, etc.) in the class body
  # and turn them into `Macro` objects so that they can be processed.
  return {} if !class_def || class_def.def_type?

  send_nodes =
    if class_def.send_type?
      [class_def]
    else
      class_def.each_child_node(:send)
    end

  send_nodes.each_with_object([]) do |node, macros|
    macros << Macro.new(node) if Macro.macro?(node)
  end.group_by(&:visibility)
end


  








  

    #on_class(class_node)  
    Also known as: #on_sclass, #on_module
  

  [ GitHub ]


  

  


# File 'lib/rubocop/cop/style/bisected_attr_accessor.rb', line 33



def on_class(class_node)
  @macros_to_rewrite[class_node] = Set.new

  find_macros(class_node.body).each_value do |macros|
    bisected = find_bisection(macros)
    next unless bisected.any?

    macros.each do |macro|
      attrs = macro.bisect(*bisected)
      next if attrs.none?

      @macros_to_rewrite[class_node] << macro
      attrs.each { |attr| register_offense(attr) }
    end
  end
end


  








  

    #on_module(class_node)  
  



  

    


Alias for #on_class.



  



  [ GitHub ]


  

  


# File 'lib/rubocop/cop/style/bisected_attr_accessor.rb', line 50



alias on_module on_class


  








  

    #on_new_investigation  
  

  [ GitHub ]


  

  


# File 'lib/rubocop/cop/style/bisected_attr_accessor.rb', line 29



def on_new_investigation
  @macros_to_rewrite = {}
end


  








  

    #on_sclass(class_node)  
  



  

    


Alias for #on_class.



  



  [ GitHub ]


  

  


# File 'lib/rubocop/cop/style/bisected_attr_accessor.rb', line 49



alias on_sclass on_class


  








  

    #register_offense(attr)   (private)
  

  [ GitHub ]


  

  


# File 'lib/rubocop/cop/style/bisected_attr_accessor.rb', line 98



def register_offense(attr)
  add_offense(attr, message: format(MSG, name: attr.source))
end