Class: Rubocop::Cop::Style::NilComparison

Inherits:
Cop
  • Object
show all
Defined in:
lib/rubocop/cop/style/nil_comparison.rb

Overview

This cop checks for comparison of something with nil using ==.

Examples:


# bad
if x == nil
if x != nil

# good
if x.nil?
if !x.nil?

Constant Summary collapse

MSG = 
'Prefer the use of the nil? predicate.'
OPS = 
%w(== === !=)
NIL_NODE = 
s(:nil)

Constants inherited from Cop

Cop::OPERATOR_METHODS

Constants included from Util

Util::PROC_NEW_NODE

Instance Attribute Summary

Attributes inherited from Cop

#config, #corrections, #offences, #processed_source

Instance Method Summary collapse

Methods inherited from Cop

#add_offence, all, #autocorrect?, #config_to_allow_offences, #config_to_allow_offences=, #cop_config, cop_name, #cop_name, cop_type, #debug?, #exclude_file?, #exclude_paths, #ignore_node, #include_file?, #include_paths, inherited, #initialize, lint?, #message, non_rails, rails?, #relevant_file?, style?, #support_autocorrect?

Methods included from Util

block_length, command?, comment_line?, const_name, first_part_of_call_chain, lambda?, lambda_or_proc?, line_range, on_node, proc?, range_with_surrounding_space, source_range, strip_quotes

Constructor Details

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

Instance Method Details

#on_send(node) ⇒ Object 



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# File 'lib/rubocop/cop/style/nil_comparison.rb', line 24

def on_send(node)
  # lambda.() does not have a selector
  return unless node.loc.selector
  op = node.loc.selector.source

  if OPS.include?(op)
    _receiver, _method, args = *node

    add_offence(node, :selector) if args == NIL_NODE
  end
end