Class: RuboCop::Cop::Lint::DeprecatedConstants

Inherits:
Base
  • Object
show all
Extended by:
AutoCorrector
Defined in:
lib/rubocop/cop/lint/deprecated_constants.rb

Overview

Checks for deprecated constants.

It has DeprecatedConstants config. If there is an alternative method, you can set alternative value as Alternative. And you can set the deprecated version as DeprecatedVersion. These options can be omitted if they are not needed.

DeprecatedConstants:
  'DEPRECATED_CONSTANT':
    Alternative: 'alternative_value'
    DeprecatedVersion: 'deprecated_version'

By default, NIL, TRUE, FALSE, Net::HTTPServerException, `Random::DEFAULT, Struct::Group, and Struct::Passwd are configured.

Examples:


# bad
NIL
TRUE
FALSE
Net::HTTPServerException
Random::DEFAULT # Return value of Ruby 2 is `Random` instance, Ruby 3.0 is `Random` class.
Struct::Group
Struct::Passwd

# good
nil
true
false
Net::HTTPClientException
Random.new # `::DEFAULT` has been deprecated in Ruby 3, `.new` is compatible with Ruby 2.
Etc::Group
Etc::Passwd

Constant Summary collapse

SUGGEST_GOOD_MSG = 
'Use `%<good>s` instead of `%<bad>s`%<deprecated_message>s.'
DO_NOT_USE_MSG = 
'Do not use `%<bad>s`%<deprecated_message>s.'

Constants inherited from Base

Base::RESTRICT_ON_SEND

Instance Attribute Summary

Attributes inherited from Base

#config, #processed_source

Instance Method Summary collapse

Methods included from AutoCorrector

support_autocorrect?

Methods inherited from Base

#active_support_extensions_enabled?, #add_global_offense, #add_offense, autocorrect_incompatible_with, badge, #begin_investigation, 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, #inspect, joining_forces, lint?, match?, #offenses, #on_investigation_end, #on_new_investigation, #on_other_file, #parse, #ready, #relevant_file?, support_autocorrect?, support_multiple_source?, #target_rails_version, #target_ruby_version

Methods included from ExcludeLimit

#exclude_limit

Methods included from AutocorrectLogic

#autocorrect?, #autocorrect_enabled?, #autocorrect_requested?, #autocorrect_with_disable_uncorrectable?, #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_const(node) ⇒ Object 



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# File 'lib/rubocop/cop/lint/deprecated_constants.rb', line 46

def on_const(node)
  # FIXME: Workaround for "`undefined method `expression' for nil:NilClass`" when processing
  #        `__ENCODING__`. It is better to be able to work without this condition.
  #        Maybe further investigation of RuboCop AST will lead to an essential solution.
  return unless node.loc

  constant = node.absolute? ? constant_name(node, node.short_name) : node.source
  return unless (deprecated_constant = deprecated_constants[constant])

  alternative = deprecated_constant['Alternative']
  version = deprecated_constant['DeprecatedVersion']
  return if target_ruby_version < version.to_f

  add_offense(node, message: message(alternative, node.source, version)) do |corrector|
    corrector.replace(node, alternative)
  end
end