Class: RuboCop::Cop::Style::ArgumentsForwarding

Inherits:
Base
  • Object
show all
Extended by:
AutoCorrector, TargetRubyVersion
Includes:
RangeHelp
Defined in:
lib/rubocop/cop/style/arguments_forwarding.rb

Overview

In Ruby 2.7, arguments forwarding has been added.

This cop identifies places where ‘do_something(*args, &block)` can be replaced by `do_something(…)`.

In Ruby 3.2, anonymous args/kwargs forwarding has been added.

This cop also identifies places where ‘use_args(*args)`/`use_kwargs(**kwargs)` can be replaced by `use_args(*)`/`use_kwargs(**)`; if desired, this functionality can be disabled by setting UseAnonymousForwarding: false.

Examples:

# bad
def foo(*args, &block)
  bar(*args, &block)
end

# bad
def foo(*args, **kwargs, &block)
  bar(*args, **kwargs, &block)
end

# good
def foo(...)
  bar(...)
end

UseAnonymousForwarding: true (default, only relevant for Ruby >= 3.2)

# bad
def foo(*args, **kwargs)
  args_only(*args)
  kwargs_only(**kwargs)
end

# good
def foo(*, **)
  args_only(*)
  kwargs_only(**)
end

UseAnonymousForwarding: false (only relevant for Ruby >= 3.2)

# good
def foo(*args, **kwargs)
  args_only(*args)
  kwargs_only(**kwargs)
end

AllowOnlyRestArgument: true (default, only relevant for Ruby < 3.2)

# good
def foo(*args)
  bar(*args)
end

def foo(**kwargs)
  bar(**kwargs)
end

AllowOnlyRestArgument: false (only relevant for Ruby < 3.2)

# bad
# The following code can replace the arguments with `...`,
# but it will change the behavior. Because `...` forwards block also.
def foo(*args)
  bar(*args)
end

def foo(**kwargs)
  bar(**kwargs)
end

Defined Under Namespace

Classes: SendNodeClassifier

Constant Summary collapse

FORWARDING_LVAR_TYPES = 
%i[splat kwsplat block_pass].freeze
ADDITIONAL_ARG_TYPES = 
%i[lvar arg].freeze
FORWARDING_MSG = 
'Use shorthand syntax `...` for arguments forwarding.'
ARGS_MSG = 
'Use anonymous positional arguments forwarding (`*`).'
KWARGS_MSG = 
'Use anonymous keyword arguments forwarding (`**`).'

Constants inherited from Base

Base::RESTRICT_ON_SEND

Instance Attribute Summary

Attributes inherited from Base

#config, #processed_source

Instance Method Summary collapse

Methods included from AutoCorrector

support_autocorrect?

Methods included from TargetRubyVersion

minimum_target_ruby_version, required_minimum_ruby_version, support_target_ruby_version?

Methods inherited from Base

#active_support_extensions_enabled?, #add_global_offense, #add_offense, autocorrect_incompatible_with, badge, #begin_investigation, 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, #inspect, 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?, #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_def(node) ⇒ Object Also known as: on_defs 



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# File 'lib/rubocop/cop/style/arguments_forwarding.rb', line 89

def on_def(node)
  return unless node.body

  forwardable_args = extract_forwardable_args(node.arguments)

  send_classifications = classify_send_nodes(
    node,
    node.each_descendant(:send).to_a,
    non_splat_or_block_pass_lvar_references(node.body),
    forwardable_args
  )

  return if send_classifications.empty?

  if only_forwards_all?(send_classifications)
    add_forward_all_offenses(node, send_classifications, forwardable_args)
  elsif target_ruby_version >= 3.2
    add_post_ruby_32_offenses(node, send_classifications, forwardable_args)
  end
end