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

Inherits:
Cop
  • Object
show all
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.

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

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

Constant Summary collapse

MODULE_FUNCTION_MSG = 
'Use `module_function` instead of `extend self`.'
EXTEND_SELF_MSG = 
'Use `extend self` instead of `module_function`.'

Constants included from Util

Util::LITERAL_REGEX

Instance Attribute Summary

Attributes inherited from Cop

#config, #corrections, #offenses, #processed_source

Instance Method Summary collapse

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_detected, #style_parameter_name, #supported_styles, #unexpected_style_detected

Methods inherited from Cop

#add_offense, all, autocorrect_incompatible_with, badge, #config_to_allow_offenses, #config_to_allow_offenses=, #cop_config, cop_name, #cop_name, #correct, department, #disable_uncorrectable, #duplicate_location?, #excluded_file?, #external_dependency_checksum, #find_location, #highlights, inherited, #initialize, #join_force?, lint?, match?, #messages, #parse, qualified_cop_name, #reason_to_not_correct, #relevant_file?, #target_rails_version, #target_ruby_version

Methods included from AST::Sexp

#s

Methods included from NodePattern::Macros

#def_node_matcher, #def_node_search, #node_search, #node_search_all, #node_search_body, #node_search_first

Methods included from AutocorrectLogic

#autocorrect?, #autocorrect_enabled?, #autocorrect_requested?, #correctable?, #disable_offense, #disable_uncorrectable?, #safe_autocorrect?, #support_autocorrect?

Methods included from IgnoredNode

#ignore_node, #ignored_node?, #part_of_ignored_node?

Methods included from Util

begins_its_line?, comment_line?, double_quotes_required?, escape_string, first_part_of_call_chain, interpret_string_escapes, line_range, needs_escaping?, on_node, parentheses?, same_line?, to_string_literal, to_supported_styles, tokens, trim_string_interporation_escape_character

Methods included from PathUtil

absolute?, chdir, hidden_dir?, hidden_file_in_not_hidden_dir?, match_path?, pwd, relative_path, reset_pwd, smart_path

Constructor Details

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

Instance Method Details

#autocorrect(node) ⇒ Object 



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# File 'lib/rubocop/cop/style/module_function.rb', line 71

def autocorrect(node)
  lambda do |corrector|
    if extend_self_node?(node)
      corrector.replace(node.source_range, 'module_function')
    else
      corrector.replace(node.source_range, 'extend self')
    end
  end
end

#on_module(node) ⇒ Object 



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# File 'lib/rubocop/cop/style/module_function.rb', line 63

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

  each_wrong_style(node.body.children) do |child_node|
    add_offense(child_node)
  end
end