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Class: RuboCop::Cop::Lint::DeprecatedClassMethods

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/lint/deprecated_class_methods.rb

Overview

Checks for uses of the deprecated class method usages.

Examples:

# bad
File.exists?(some_path)
Dir.exists?(some_path)
iterator?
attr :name, true
attr :name, false
ENV.freeze # Calling `Env.freeze` raises `TypeError` since Ruby 2.7.
ENV.clone
ENV.dup # Calling `Env.dup` raises `TypeError` since Ruby 3.1.
Socket.gethostbyname(host)
Socket.gethostbyaddr(host)

# good
File.exist?(some_path)
Dir.exist?(some_path)
block_given?
attr_accessor :name
attr_reader :name
ENV # `ENV.freeze` cannot prohibit changes to environment variables.
ENV.to_h
ENV.to_h # `ENV.dup` cannot dup `ENV`, use `ENV.to_h` to get a copy of `ENV` as a hash.
Addrinfo.getaddrinfo(nodename, service)
Addrinfo.tcp(host, port).getnameinfo

Constant Summary

::RuboCop::Cop::Base - Inherited

EMPTY_OFFENSES, RESTRICT_ON_SEND

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.

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

Returns an url to view this cops documentation online.

.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::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

Actually private methods.

#use_corrector

::RuboCop::Cop::AutocorrectLogic - Included

::RuboCop::Cop::IgnoredNode - Included

Constructor Details

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

Instance Method Details

#deprecated_class_method?(node)

[ GitHub ]

  
# File 'lib/rubocop/cop/lint/deprecated_class_methods.rb', line 53

def_node_matcher :deprecated_class_method?, <<~PATTERN
  {
    (send (const {cbase nil?} :ENV) {:clone :dup :freeze})
    (send (const {cbase nil?} {:File :Dir}) :exists? _)
    (send (const {cbase nil?} :Socket) {:gethostbyaddr :gethostbyname} ...)
    (send nil? :attr _ boolean)
    (send nil? :iterator?)
  }
PATTERN

#dir_env_file_const?(node) ⇒ Boolean (private)

[ GitHub ]

  
# File 'lib/rubocop/cop/lint/deprecated_class_methods.rb', line 112

def dir_env_file_const?(node)
  DIR_ENV_FILE_CONSTANTS.include?(node&.short_name)
end

#offense_range(node) (private)

[ GitHub ]

  
# File 'lib/rubocop/cop/lint/deprecated_class_methods.rb', line 83

def offense_range(node)
  if socket_const?(node.receiver) || dir_env_file_const?(node.receiver)
    node.source_range.begin.join(node.loc.selector.end)
  elsif node.method?(:attr)
    node
  else
    node.loc.selector
  end
end

#on_send(node)

[ GitHub ]

  
# File 'lib/rubocop/cop/lint/deprecated_class_methods.rb', line 63

def on_send(node)
  return unless deprecated_class_method?(node)

  offense_range = offense_range(node)
  prefer = preferred_method(node)
  message = format(MSG, current: offense_range.source, prefer: prefer)

  add_offense(offense_range, message: message) do |corrector|
    next if socket_const?(node.receiver)

    if node.method?(:freeze)
      corrector.replace(node, 'ENV')
    else
      corrector.replace(offense_range, prefer)
    end
  end
end

#preferred_method(node) (private)

[ GitHub ]

  
# File 'lib/rubocop/cop/lint/deprecated_class_methods.rb', line 93

def preferred_method(node)
  if node.method?(:attr)
    boolean_argument = node.arguments[1].source
    preferred_attr_method = boolean_argument == 'true' ? 'attr_accessor' : 'attr_reader'

    "#{preferred_attr_method} #{node.first_argument.source}"
  elsif dir_env_file_const?(node.receiver)
    prefer = PREFERRED_METHODS[node.method_name]

    prefer ? "#{node.receiver.source}.#{prefer}" : 'ENV'
  else
    PREFERRED_METHODS[node.method_name]
  end
end

#socket_const?(node) ⇒ Boolean (private)

[ GitHub ]

  
# File 'lib/rubocop/cop/lint/deprecated_class_methods.rb', line 108

def socket_const?(node)
  node&.short_name == :Socket
end