Class: RuboCop::Cop::Naming::BlockForwarding

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

Overview

In Ruby 3.1, anonymous block forwarding has been added.

This cop identifies places where do_something(&block) can be replaced by do_something(&).

It also supports the opposite style by alternative explicit option. You can specify the block variable name for autocorrection with BlockForwardingName. The default variable name is block. If the name is already in use, it will not be autocorrected.

Examples:

EnforcedStyle: anonymous (default)


# bad
def foo(&block)
  bar(&block)
end

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

EnforcedStyle: explicit


# bad
def foo(&)
  bar(&)
end

# good
def foo(&block)
  bar(&block)
end

Constant Summary collapse

MSG = 
'Use %<style>s block 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 included from ConfigurableEnforcedStyle

#alternative_style, #alternative_styles, #ambiguous_style_detected, #correct_style_detected, #detected_style, #detected_style=, #no_acceptable_style!, #no_acceptable_style?, #opposite_style_detected, #style, #style_configured?, #style_detected, #style_parameter_name, #supported_styles, #unexpected_style_detected

Methods inherited from Base

#active_support_extensions_enabled?, #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?, #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/naming/block_forwarding.rb', line 50

def on_def(node)
  return if node.arguments.empty?

  last_argument = node.arguments.last
  return if expected_block_forwarding_style?(node, last_argument)

  register_offense(last_argument, node)

  node.each_descendant(:block_pass) do |block_pass_node|
    next if block_pass_node.children.first&.sym_type? ||
            last_argument.source != block_pass_node.source

    register_offense(block_pass_node, node)
  end
end