Class: RuboCop::Cop::Style::OptionalBooleanParameter

Inherits:
Base
  • Object
show all
Includes:
AllowedMethods
Defined in:
lib/rubocop/cop/style/optional_boolean_parameter.rb

Overview

This cop checks for places where keyword arguments can be used instead of boolean arguments when defining methods. `respond_to_missing?` method is allowed by default. These are customizable with `AllowedMethods` option.

Examples:

# bad
def some_method(bar = false)
  puts bar
end

# bad - common hack before keyword args were introduced
def some_method(options = {})
  bar = options.fetch(:bar, false)
  puts bar
end

# good
def some_method(bar: false)
  puts bar
end

AllowedMethods: ['some_method']

# good
def some_method(bar = false)
  puts bar
end

Constant Summary collapse

MSG =
'Use keyword arguments when defining method with boolean argument.'
BOOLEAN_TYPES =
%i[true false].freeze

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

#add_global_offense, #add_offense, autocorrect_incompatible_with, badge, #callbacks_needed, callbacks_needed, #config_to_allow_offenses, #config_to_allow_offenses=, #cop_config, #cop_name, cop_name, department, documentation_url, exclude_from_registry, #excluded_file?, #external_dependency_checksum, inherited, #initialize, joining_forces, lint?, match?, #message, #offenses, #on_investigation_end, #on_new_investigation, #on_other_file, #parse, #ready, #relevant_file?, 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?, #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_def(node) ⇒ Object Also known as: on_defs


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# File 'lib/rubocop/cop/style/optional_boolean_parameter.rb', line 39

def on_def(node)
  return if allowed_method?(node.method_name)

  node.arguments.each do |arg|
    next unless arg.optarg_type?

    _name, value = *arg
    add_offense(arg) if BOOLEAN_TYPES.include?(value.type)
  end
end