Class: RuboCop::Cop::Lint::ConstantResolution

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

Overview

Check that certain constants are fully qualified.

This is not enabled by default because it would mark a lot of offenses unnecessarily.

Generally, gems should fully qualify all constants to avoid conflicts with the code that uses the gem. Enable this cop without using ‘Only`/`Ignore`

Large projects will over time end up with one or two constant names that are problematic because of a conflict with a library or just internally using the same name a namespace and a class. To avoid too many unnecessary offenses, Enable this cop with ‘Only: [The, Constant, Names, Causing, Issues]`

NOTE: ‘Style/RedundantConstantBase` cop is disabled if this cop is enabled to prevent conflicting rules. Because it respects user configurations that want to enable this cop which is disabled by default.

Examples:

# By default checks every constant

# bad
User

# bad
User::Login

# good
::User

# good
::User::Login

Only: [‘Login’]

# Restrict this cop to only being concerned about certain constants

# bad
Login

# good
::Login

# good
User::Login

Ignore: [‘Login’]

# Restrict this cop not being concerned about certain constants

# bad
User

# good
::User::Login

# good
Login

Constant Summary collapse

MSG = 
'Fully qualify this constant to avoid possibly ambiguous resolution.'

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

#active_support_extensions_enabled?, #add_global_offense, #add_offense, #always_autocorrect?, autocorrect_incompatible_with, badge, #begin_investigation, #callbacks_needed, callbacks_needed, #config_to_allow_offenses, #config_to_allow_offenses=, #contextual_autocorrect?, #cop_config, cop_name, #cop_name, department, documentation_url, exclude_from_registry, #excluded_file?, #external_dependency_checksum, inherited, #initialize, #inspect, joining_forces, lint?, match?, #message, #offenses, #on_investigation_end, #on_new_investigation, #on_other_file, #parse, #parser_engine, #ready, #relevant_file?, requires_gem, #string_literals_frozen_by_default?, 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/constant_resolution.rb', line 70

def on_const(node)
  return if !unqualified_const?(node) || node.parent&.defined_module || node.loc.nil?

  add_offense(node)
end

#unqualified_const?(node) ⇒ Object 



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# File 'lib/rubocop/cop/lint/constant_resolution.rb', line 66

def_node_matcher :unqualified_const?, <<~PATTERN
  (const nil? #const_name?)
PATTERN