Class: RuboCop::Cop::Style::Not

Inherits:
Base
  • Object
show all
Extended by:
AutoCorrector
Includes:
RangeHelp
Defined in:
lib/rubocop/cop/style/not.rb

Overview

Checks for uses of the keyword not instead of !. The not keyword has lower precedence than !, which can lead to surprising behavior and often requires parentheses.

Examples:


# bad - parentheses are required because of op precedence
x = (not something)

# good
x = !something

Constant Summary collapse

MSG = 
'Use `!` instead of `not`.'
RESTRICT_ON_SEND = 
%i[!].freeze
OPPOSITE_METHODS = 
{
  :== => :!=,
  :!= => :==,
  :<= => :>,
  :> => :<=,
  :< => :>=,
  :>= => :<
}.freeze

Constants included from RangeHelp

RangeHelp::BYTE_ORDER_MARK, RangeHelp::NOT_GIVEN

Instance Attribute Summary

Attributes inherited from Base

#config, #processed_source, #project_index

Instance Method Summary collapse

Methods included from AutoCorrector

support_autocorrect?

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_gem_version, #target_rails_version, #target_ruby_version

Methods included from ExcludeLimit

cop_dir_for, #exclude_limit, read_limits

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_send(node) ⇒ Object 



34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
 
# File 'lib/rubocop/cop/style/not.rb', line 34

def on_send(node)
  return unless node.prefix_not?

  add_offense(node.loc.selector) do |corrector|
    range = range_with_surrounding_space(node.loc.selector, side: :right)

    if opposite_method?(node.receiver)
      correct_opposite_method(corrector, range, node.receiver)
    elsif requires_parens?(node.receiver)
      correct_with_parens(corrector, range, node)
    else
      correct_without_parens(corrector, range)
    end
  end
end