Class: RuboCop::Cop::Style::SingleLineBlockParams

Inherits:
Cop
  • Object
show all
Defined in:
lib/rubocop/cop/style/single_line_block_params.rb

Overview

This cop checks whether the block parameters of a single-line method accepting a block match the names specified via configuration.

For instance one can configure reduce(inject) to use |a, e| as parameters.

Constant Summary

Constants included from Util

Util::ASGN_NODES, Util::EQUALS_ASGN_NODES, Util::OPERATOR_METHODS, Util::PROC_NEW_NODE, Util::SHORTHAND_ASGN_NODES

Instance Attribute Summary

Attributes inherited from Cop

#config, #corrections, #offenses, #processed_source

Instance Method Summary collapse

Methods inherited from Cop

#add_offense, all, #autocorrect?, #config_to_allow_offenses, #config_to_allow_offenses=, #cop_config, cop_name, #cop_name, cop_name_with_namespace, cop_type, #debug?, #display_cop_names?, inherited, #initialize, #join_force?, lint?, non_rails, qualified_cop_name, rails?, #relevant_file?, #support_autocorrect?

Methods included from IgnoredNode

#ignore_node, #ignored_node?, #part_of_ignored_node?

Methods included from Util

begins_its_line?, block_length, command?, comment_line?, const_name, first_part_of_call_chain, lambda?, lambda_or_proc?, line_range, numeric_range_size, on_node, operator?, parentheses?, proc?, range_with_surrounding_space, source_range, strip_quotes, within_node?

Methods included from PathUtil

issue_deprecation_warning, match_path?, relative_path

Constructor Details

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

Instance Method Details

#on_block(node) ⇒ Object


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# File 'lib/rubocop/cop/style/single_line_block_params.rb', line 12

def on_block(node)
  # we care only for single line blocks
  return unless Util.block_length(node) == 0

  method_node, args_node, _body_node = *node
  receiver, method_name, _method_args = *method_node

  # discard other scenarios
  return unless receiver
  return unless method_names.include?(method_name)

  # discard cases with argument destructuring
  args = *args_node

  return true unless args.all? { |n| n.type == :arg }
  return if args_match?(method_name, args)

  add_offense(args_node, :expression, message(method_name))
end