Class: RuboCop::Cop::Style::NilComparison

Inherits:

Cop

• Object
• Cop
• RuboCop::Cop::Style::NilComparison

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
end

# good
if x.nil?
end

Constant Summary

MSG =

'Prefer the use of the `nil?` predicate.'.freeze

Constants included from Util

Util::ASGN_NODES, Util::CONDITIONAL_NODES, Util::EQUALS_ASGN_NODES, Util::LITERAL_REGEX, Util::LOGICAL_OPERATOR_NODES, Util::MODIFIER_NODES, Util::OPERATOR_METHODS, Util::SHORTHAND_ASGN_NODES

Instance Attribute Summary

Attributes inherited from Cop

#config, #corrections, #offenses, #processed_source

Instance Method Summary

• #autocorrect(node) ⇒ Object
• #on_send(node) ⇒ Object

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, operator?, parentheses?, same_line?, to_string_literal, to_supported_styles, tokens

Methods included from PathUtil

absolute?, match_path?, pwd, relative_path, reset_pwd, smart_path

Constructor Details

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

Instance Method Details

#autocorrect(node) ⇒ Object

# File 'lib/rubocop/cop/style/nil_comparison.rb', line 28

def autocorrect(node)
  new_code = node.source.sub(/\s*={2,3}\s*nil/, '.nil?')
  ->(corrector) { corrector.replace(node.source_range, new_code) }
end

#on_send(node) ⇒ Object

# File 'lib/rubocop/cop/style/nil_comparison.rb', line 22

def on_send(node)
  nil_comparison?(node) do
    add_offense(node, location: :selector)
  end
end