Class: RuboCop::Cop::Style::TrailingCommaInBlockArgs

Inherits:
Base
  • Object
show all
Extended by:
AutoCorrector
Defined in:
lib/rubocop/cop/style/trailing_comma_in_block_args.rb

Overview

Checks whether trailing commas in block arguments are required. Blocks with only one argument and a trailing comma require that comma to be present. Blocks with more than one argument never require a trailing comma.

Examples:

# bad
add { |foo, bar,| foo + bar }

# good
add { |foo, bar| foo + bar }

# good
add { |foo,| foo }

# good
add { foo }

# bad
add do |foo, bar,|
  foo + bar
end

# good
add do |foo, bar|
  foo + bar
end

# good
add do |foo,|
  foo
end

# good
add do
  foo + bar
end

Constant Summary collapse

MSG = 
'Useless trailing comma present in block arguments.'

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 inherited from Base

#active_support_extensions_enabled?, #add_global_offense, #add_offense, #always_autocorrect?, autocorrect_incompatible_with, badge, #begin_investigation, #callbacks_needed, callbacks_needed, #config_to_allow_offenses, #config_to_allow_offenses=, #contextual_autocorrect?, #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, #parser_engine, #ready, #relevant_file?, requires_gem, #string_literals_frozen_by_default?, 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_block(node) ⇒ Object

rubocop:disable InternalAffairs/NumblockHandler



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# File 'lib/rubocop/cop/style/trailing_comma_in_block_args.rb', line 67

def on_block(node) # rubocop:disable InternalAffairs/NumblockHandler
  # lambda literal (`->`) never has block arguments.
  return if node.send_node.lambda_literal?
  return unless useless_trailing_comma?(node)

  last_comma_pos = last_comma(node).pos

  add_offense(last_comma_pos) { |corrector| corrector.replace(last_comma_pos, '') }
end