Class: RuboCop::Cop::Style::ModuleFunction

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

Overview

This cop checks for use of `extend self` or `module_function` in a module.

Supported styles are: module_function, extend_self, forbidden.

In case there are private methods, the cop won't be activated. Otherwise, it forces to change the flow of the default code.

The option `forbidden` prohibits the usage of both styles.

These offenses are not safe to auto-correct since there are different implications to each approach.

Examples:

EnforcedStyle: module_function (default)

# bad
module Test
  extend self
  # ...
end

# good
module Test
  module_function
  # ...
end

EnforcedStyle: module_function (default)

# good
module Test
  extend self
  # ...
  private
  # ...
end

EnforcedStyle: extend_self

# bad
module Test
  module_function
  # ...
end

# good
module Test
  extend self
  # ...
end

EnforcedStyle: forbidden

# bad
module Test
  module_function
  # ...
end

# bad
module Test
  extend self
  # ...
end

# bad
module Test
  extend self
  # ...
  private
  # ...
end

Constant Summary collapse

MODULE_FUNCTION_MSG =
'Use `module_function` instead of `extend self`.'
EXTEND_SELF_MSG =
'Use `extend self` instead of `module_function`.'
FORBIDDEN_MSG =
'Do not use `module_function` or `extend self`.'

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 included from AutoCorrector

support_autocorrect?

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

#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_module(node) ⇒ Object


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

def on_module(node)
  return unless node.body&.begin_type?

  each_wrong_style(node.body.children) do |child_node|
    add_offense(child_node) do |corrector|
      next if style == :forbidden

      if extend_self_node?(child_node)
        corrector.replace(child_node, 'module_function')
      else
        corrector.replace(child_node, 'extend self')
      end
    end
  end
end