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

Inherits:
Base
  • 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.

Configuration option: Methods Should be set to use this cop. Array of hashes, where each key is the method name and value - array of argument names.

Examples:

Methods: [%w[a b]]

# bad
foo.reduce { |c, d| c + d }
foo.reduce { |_, _d| 1 }

# good
foo.reduce { |a, b| a + b }
foo.reduce { |a, _b| a }
foo.reduce { |a, (id, _)| a + id }
foo.reduce { true }

# good
foo.reduce do |c, d|
  c + d
end

Constant Summary collapse

MSG = 
'Name `%<method>s` block params `|%<params>s|`.'

Constants inherited from Base

Base::RESTRICT_ON_SEND

Constants included from Util

Util::LITERAL_REGEX

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?, #offenses, #on_investigation_end, #on_new_investigation, #on_other_file, #ready, #relevant_file?, support_autocorrect?, support_multiple_source?, #target_rails_version, #target_ruby_version

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

add_parentheses, args_begin, args_end, begins_its_line?, comment_line?, comment_lines?, double_quotes_required?, escape_string, first_part_of_call_chain, indent, interpret_string_escapes, line_range, needs_escaping?, on_node, parentheses?, same_line?, to_string_literal, to_supported_styles, trim_string_interporation_escape_character

Methods included from PathUtil

absolute?, hidden_dir?, hidden_file?, hidden_file_in_not_hidden_dir?, match_path?, maybe_hidden_file?, relative_path, smart_path

Constructor Details

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

Instance Method Details

#on_block(node) ⇒ Object 



34
35
36
37
38
39
40
41
42
43
44
45
 
# File 'lib/rubocop/cop/style/single_line_block_params.rb', line 34

def on_block(node)
  return unless node.single_line?

  return unless eligible_method?(node)
  return unless eligible_arguments?(node)

  return if args_match?(node.send_node.method_name, node.arguments)

  message = message(node.arguments)

  add_offense(node.arguments, message: message)
end