Class: RuboCop::Cop::Naming::ConstantName

Inherits:
Cop
  • Object
show all
Defined in:
lib/rubocop/cop/naming/constant_name.rb

Overview

This cop checks whether constant names are written using SCREAMING_SNAKE_CASE.

To avoid false positives, it ignores cases in which we cannot know for certain the type of value that would be assigned to a constant.

Examples:

# bad
InchInCm = 2.54
INCHinCM = 2.54
Inch_In_Cm = 2.54

# good
INCH_IN_CM = 2.54

Constant Summary collapse

MSG = 
'Use SCREAMING_SNAKE_CASE for constants.'
SNAKE_CASE =

Use POSIX character classes, so we allow accented characters rather than just standard ASCII characters

/^[[:digit:][:upper:]_]+$/.freeze

Constants included from Util

Util::LITERAL_REGEX

Instance Attribute Summary

Attributes inherited from Cop

#config, #corrections, #offenses, #processed_source

Instance Method Summary collapse

Methods inherited from Cop

#add_offense, all, autocorrect_incompatible_with, badge, #config_to_allow_offenses, #config_to_allow_offenses=, #cop_config, cop_name, #cop_name, #correct, department, #duplicate_location?, #excluded_file?, #find_location, #highlights, inherited, #initialize, #join_force?, lint?, match?, #message, #messages, non_rails, #parse, qualified_cop_name, #relevant_file?, #target_rails_version, #target_ruby_version

Methods included from AST::Sexp

#s

Methods included from NodePattern::Macros

#def_node_matcher, #def_node_search, #node_search, #node_search_all, #node_search_body, #node_search_first

Methods included from AutocorrectLogic

#autocorrect?, #autocorrect_enabled?, #autocorrect_requested?, #support_autocorrect?

Methods included from IgnoredNode

#ignore_node, #ignored_node?, #part_of_ignored_node?

Methods included from Util

begins_its_line?, comment_line?, double_quotes_required?, escape_string, first_part_of_call_chain, interpret_string_escapes, line_range, needs_escaping?, on_node, parentheses?, same_line?, to_string_literal, to_supported_styles, tokens, trim_string_interporation_escape_character

Methods included from PathUtil

absolute?, chdir, hidden_dir?, hidden_file_in_not_hidden_dir?, match_path?, pwd, relative_path, reset_pwd, smart_path

Constructor Details

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

Instance Method Details

#on_casgn(node) ⇒ Object 



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# File 'lib/rubocop/cop/naming/constant_name.rb', line 32

def on_casgn(node)
  if node.parent&.or_asgn_type?
    lhs, value = *node.parent
    _scope, const_name = *lhs
  else
    _scope, const_name, value = *node
  end

  # We cannot know the result of method calls like
  # NewClass = something_that_returns_a_class
  # It's also ok to assign a class constant another class constant,
  # `Class.new(...)` or `Struct.new(...)`
  # SomeClass = SomeOtherClass
  # SomeClass = Class.new(...)
  # SomeClass = Struct.new(...)
  return if allowed_assignment?(value)

  add_offense(node, location: :name) if const_name !~ SNAKE_CASE
end