Class: RuboCop::Cop::Style::ClassAndModuleChildren

Relationships & Source Files
Super Chains via Extension / Inclusion / Inheritance
Class Chain: self, `::RuboCop::Cop::AutoCorrector`, `::RuboCop::Cop::Base`, `::RuboCop::ExcludeLimit`, NodePattern::Macros, RuboCop::AST::Sexp
Instance Chain: self, `::RuboCop::Cop::RangeHelp`, `::RuboCop::Cop::ConfigurableEnforcedStyle`, `::RuboCop::Cop::Alignment`, `::RuboCop::Cop::Base`, `::RuboCop::Cop::AutocorrectLogic`, `::RuboCop::Cop::IgnoredNode`, `::RuboCop::Util`, RuboCop::AST::Sexp
Inherits:	RuboCop::Cop::Base Object RuboCop::Cop::Base RuboCop::Cop::Style::ClassAndModuleChildren
Defined in:	lib/rubocop/cop/style/class_and_module_children.rb

Overview

Checks the style of children definitions at classes and modules. Basically there are two different styles:

The compact style is only forced for classes/modules with one child.

Examples:

EnforcedStyle: nested (default)

# good
# have each child on its own line
class Foo
  class Bar
  end
end

EnforcedStyle: compact

# good
# combine definitions as much as possible
class Foo::Bar
end

Cop Safety Information:

Autocorrection is unsafe.

Moving from compact to nested children requires knowledge of whether the outer parent is a module or a class. Moving from nested to compact requires verification that the outer parent is defined elsewhere. RuboCop does not have the knowledge to perform either operation safely and thus requires manual oversight.

Constant Summary

COMPACT_MSG =
# File 'lib/rubocop/cop/style/class_and_module_children.rb', line 40
```
'Use compact module/class definition instead of nested style.'
```
NESTED_MSG =
# File 'lib/rubocop/cop/style/class_and_module_children.rb', line 39
```
'Use nested module/class definitions instead of compact style.'
```

Class Attribute Summary

`::RuboCop::Cop::AutoCorrector` - Extended

support_autocorrect?

`::RuboCop::Cop::Base` - Inherited

.gem_requirements, .lint?,
.support_autocorrect?	Returns if class supports autocorrect.
.support_multiple_source?	Override if your cop should be called repeatedly for multiple investigations Between calls to `on_new_investigation` and `on_investigation_end`, the result of `processed_source` will remain constant.
.builtin?

Class Method Summary

`::RuboCop::Cop::Base` - Inherited

.autocorrect_incompatible_with	List of cops that should not try to autocorrect at the same time as this cop.
.badge	Naming.
.callbacks_needed, .cop_name, .department,
.documentation_url	Cops (other than builtin) are encouraged to implement this.
.exclude_from_registry	Call for abstract Cop classes.
.inherited,
.joining_forces	Override and return the Force class(es) you need to join.
.match?	Returns true if the cop name or the cop namespace matches any of the given names.
.new,
.requires_gem	Register a version requirement for the given gem name.
.restrict_on_send

`::RuboCop::ExcludeLimit` - Extended

exclude_limit	Sets up a configuration option to have an exclude limit tracked.
transform

Instance Attribute Summary

`::RuboCop::Cop::ConfigurableEnforcedStyle` - Included

#detected_style, #detected_style=, #no_acceptable_style?, #style_configured?

`::RuboCop::Cop::Alignment` - Included

#column_delta

`::RuboCop::Cop::Base` - Inherited

#active_support_extensions_enabled?, #always_autocorrect?, #config, #config_to_allow_offenses, #config_to_allow_offenses=, #contextual_autocorrect?, #processed_source, #target_satisfies_all_gem_version_requirements?

`::RuboCop::Cop::AutocorrectLogic` - Included

#autocorrect?, #autocorrect_enabled?, #autocorrect_requested?, #autocorrect_with_disable_uncorrectable?, #correctable?, #disable_uncorrectable?, #safe_autocorrect?

Instance Method Summary

#on_class(node)
#on_module(node)
#add_trailing_end(corrector, node, padding) private
#autocorrect(corrector, node) private
#check_compact_style(node, body) private
#check_nested_style(node) private
#check_style(node, body) private
#compact_definition(corrector, node) private
#compact_identifier_name(node) private
#compact_node(corrector, node) private
#compact_node_name?(node) ⇒ Boolean private
#compact_replacement(node) private
#leading_spaces(node) private
#needs_compacting?(body) ⇒ Boolean private
#nest_definition(corrector, node) private
#nest_or_compact(corrector, node) private
#remove_end(corrector, body) private
#replace_namespace_keyword(corrector, node) private
#split_on_double_colon(corrector, node, padding) private
#unindent(corrector, node) private

`::RuboCop::Cop::RangeHelp` - Included

#add_range, #column_offset_between,
#contents_range	A range containing only the contents of a literal with delimiters (e.g.
#directions,
#effective_column	Returns the column attribute of the range, except if the range is on the first line and there’s a byte order mark at the beginning of that line, in which case 1 is subtracted from the column value.
#final_pos, #move_pos, #move_pos_str, #range_between, #range_by_whole_lines, #range_with_comments, #range_with_comments_and_lines, #range_with_surrounding_comma, #range_with_surrounding_space, #source_range

`::RuboCop::Cop::ConfigurableEnforcedStyle` - Included

#alternative_style, #alternative_styles, #ambiguous_style_detected,
#conflicting_styles_detected	Alias for ConfigurableEnforcedStyle#no_acceptable_style!.
#correct_style_detected, #no_acceptable_style!, #opposite_style_detected, #style, #style_detected, #style_parameter_name, #supported_styles, #unexpected_style_detected,
#unrecognized_style_detected	Alias for ConfigurableEnforcedStyle#no_acceptable_style!.

`::RuboCop::Cop::Alignment` - Included

#check_alignment, #configured_indentation_width, #display_column, #each_bad_alignment, #end_of_line_comment, #indentation, #offset, #register_offense, #within?

`::RuboCop::Cop::Base` - Inherited

#add_global_offense	Adds an offense that has no particular location.
#add_offense	Adds an offense on the specified range (or node with an expression) Unless that offense is disabled for this range, a corrector will be yielded to provide the cop the opportunity to autocorrect the offense.
#begin_investigation	Called before any investigation.
#callbacks_needed,
#cop_config	Configuration Helpers.
#cop_name, #excluded_file?,
#external_dependency_checksum	This method should be overridden when a cop’s behavior depends on state that lives outside of these locations:
#inspect,
#message	Gets called if no message is specified when calling `add_offense` or `add_global_offense` Cops are discouraged to override this; instead pass your message directly.
#name	Alias for Base#cop_name.
#offenses,
#on_investigation_end	Called after all on_…
#on_new_investigation	Called before all on_…
#on_other_file	Called instead of all on_…
#parse	There should be very limited reasons for a Cop to do it’s own parsing.
#parser_engine,
#ready	Called between investigations.
#relevant_file?, #target_rails_version, #target_ruby_version, #annotate, #apply_correction, #attempt_correction,
#callback_argument	Reserved for Cop::Cop.
#complete_investigation	Called to complete an investigation.
#correct, #current_corrector,
#current_offense_locations	Reserved for Commissioner:
#current_offenses, #currently_disabled_lines, #custom_severity, #default_severity, #disable_uncorrectable, #enabled_line?, #file_name_matches_any?, #find_message, #find_severity, #range_for_original, #range_from_node_or_range, #reset_investigation, #use_corrector

`::RuboCop::Cop::AutocorrectLogic` - Included

#disable_offense, #disable_offense_at_end_of_line, #disable_offense_before_and_after, #disable_offense_with_eol_or_surround_comment, #max_line_length,
#range_by_lines	Expand the given range to include all of any lines it covers.
#range_of_first_line, #surrounding_heredoc, #surrounding_percent_array

`::RuboCop::Cop::IgnoredNode` - Included

#ignore_node, #ignored_node?, #part_of_ignored_node?, #ignored_nodes

Constructor Details

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

Instance Method Details

#add_trailing_end(corrector, node, padding) (private)

[ GitHub ]

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


def add_trailing_end(corrector, node, padding)
  replacement = "#{padding}end\n#{leading_spaces(node)}end"
  corrector.replace(node.loc.end, replacement)
end

#autocorrect(corrector, node) (private)

[ GitHub ]

# File 'lib/rubocop/cop/style/class_and_module_children.rb', line 170


def autocorrect(corrector, node)
  return if node.class_type? && node.parent_class && style != :nested

  nest_or_compact(corrector, node)
end

#check_compact_style(node, body) (private)

[ GitHub ]

# File 'lib/rubocop/cop/style/class_and_module_children.rb', line 159


def check_compact_style(node, body)
  parent = node.parent
  return if parent&.class_type? || parent&.module_type?

  return unless needs_compacting?(body)

  add_offense(node.loc.name, message: COMPACT_MSG) do |corrector|
    autocorrect(corrector, node)
  end
end

#check_nested_style(node) (private)

[ GitHub ]

# File 'lib/rubocop/cop/style/class_and_module_children.rb', line 151


def check_nested_style(node)
  return unless compact_node_name?(node)

  add_offense(node.loc.name, message: NESTED_MSG) do |corrector|
    autocorrect(corrector, node)
  end
end

#check_style(node, body) (private)

[ GitHub ]

# File 'lib/rubocop/cop/style/class_and_module_children.rb', line 141


def check_style(node, body)
  return if node.identifier.namespace&.cbase_type?

  if style == :nested
    check_nested_style(node)
  else
    check_compact_style(node, body)
  end
end

#compact_definition(corrector, node) (private)

[ GitHub ]

# File 'lib/rubocop/cop/style/class_and_module_children.rb', line 94


def compact_definition(corrector, node)
  compact_node(corrector, node)
  remove_end(corrector, node.body)
  unindent(corrector, node)
end

#compact_identifier_name(node) (private)

[ GitHub ]

# File 'lib/rubocop/cop/style/class_and_module_children.rb', line 115


def compact_identifier_name(node)
  "#{node.identifier.const_name}::" \
    "#{node.body.children.first.const_name}"
end

#compact_node(corrector, node) (private)

[ GitHub ]

# File 'lib/rubocop/cop/style/class_and_module_children.rb', line 100


def compact_node(corrector, node)
  range = range_between(node.loc.keyword.begin_pos, node.body.loc.name.end_pos)
  corrector.replace(range, compact_replacement(node))
end

#compact_node_name?(node) ⇒ `Boolean` (private)

[ GitHub ]

# File 'lib/rubocop/cop/style/class_and_module_children.rb', line 180


def compact_node_name?(node)
  node.identifier.source.include?('::')
end

#compact_replacement(node) (private)

[ GitHub ]

# File 'lib/rubocop/cop/style/class_and_module_children.rb', line 105


def compact_replacement(node)
  replacement = "#{node.body.type} #{compact_identifier_name(node)}"

  body_comments = processed_source.ast_with_comments[node.body]
  unless body_comments.empty?
    replacement = body_comments.map(&:text).push(replacement).join("\n")
  end
  replacement
end

#leading_spaces(node) (private)

[ GitHub ]

# File 'lib/rubocop/cop/style/class_and_module_children.rb', line 137


def leading_spaces(node)
  node.source_range.source_line[/\A\s*/]
end

#needs_compacting?(body) ⇒ `Boolean` (private)

[ GitHub ]

# File 'lib/rubocop/cop/style/class_and_module_children.rb', line 176


def needs_compacting?(body)
  body && %i[module class].include?(body.type)
end

#nest_definition(corrector, node) (private)

[ GitHub ]

# File 'lib/rubocop/cop/style/class_and_module_children.rb', line 62


def nest_definition(corrector, node)
  padding = indentation(node) + leading_spaces(node)
  padding_for_trailing_end = padding.sub(' ' * node.loc.end.column, '')

  replace_namespace_keyword(corrector, node)
  split_on_double_colon(corrector, node, padding)
  add_trailing_end(corrector, node, padding_for_trailing_end)
end

#nest_or_compact(corrector, node) (private)

[ GitHub ]

# File 'lib/rubocop/cop/style/class_and_module_children.rb', line 54


def nest_or_compact(corrector, node)
  if style == :nested
    nest_definition(corrector, node)
  else
    compact_definition(corrector, node)
  end
end

#on_class(node)

[ GitHub ]

# File 'lib/rubocop/cop/style/class_and_module_children.rb', line 42


def on_class(node)
  return if node.parent_class && style != :nested

  check_style(node, node.body)
end

#on_module(node)

[ GitHub ]

# File 'lib/rubocop/cop/style/class_and_module_children.rb', line 48


def on_module(node)
  check_style(node, node.body)
end

#remove_end(corrector, body) (private)

[ GitHub ]

# File 'lib/rubocop/cop/style/class_and_module_children.rb', line 120


def remove_end(corrector, body)
  remove_begin_pos = body.loc.end.begin_pos - leading_spaces(body).size
  adjustment = processed_source.raw_source[remove_begin_pos] == ';' ? 0 : 1
  range = range_between(remove_begin_pos, body.loc.end.end_pos + adjustment)

  corrector.remove(range)
end

#replace_namespace_keyword(corrector, node) (private)

[ GitHub ]

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


def replace_namespace_keyword(corrector, node)
  class_definition = node.left_sibling&.each_node(:class)&.find do |class_node|
    class_node.identifier == node.identifier.namespace
  end
  namespace_keyword = class_definition ? 'class' : 'module'

  corrector.replace(node.loc.keyword, namespace_keyword)
end

#split_on_double_colon(corrector, node, padding) (private)

[ GitHub ]

# File 'lib/rubocop/cop/style/class_and_module_children.rb', line 80


def split_on_double_colon(corrector, node, padding)
  children_definition = node.children.first
  range = range_between(children_definition.loc.double_colon.begin_pos,
                        children_definition.loc.double_colon.end_pos)
  replacement = "\n#{padding}#{node.loc.keyword.source} "

  corrector.replace(range, replacement)
end

#unindent(corrector, node) (private)

[ GitHub ]

# File 'lib/rubocop/cop/style/class_and_module_children.rb', line 128


def unindent(corrector, node)
  return if node.body.children.last.nil?

  column_delta = configured_indentation_width - leading_spaces(node.body.children.last).size
  return if column_delta.zero?

  AlignmentCorrector.correct(corrector, processed_source, node, column_delta)
end

Class: RuboCop::Cop::Style::ClassAndModuleChildren

Overview

Constant Summary

::RuboCop::Cop::Base - Inherited

::RuboCop::Cop::Alignment - Included

::RuboCop::Cop::ConfigurableEnforcedStyle - Included

::RuboCop::Cop::RangeHelp - Included

Class Attribute Summary

::RuboCop::Cop::AutoCorrector - Extended

::RuboCop::Cop::Base - Inherited

Class Method Summary

::RuboCop::Cop::Base - Inherited

::RuboCop::ExcludeLimit - Extended

Instance Attribute Summary

::RuboCop::Cop::ConfigurableEnforcedStyle - Included

::RuboCop::Cop::Alignment - Included

::RuboCop::Cop::Base - Inherited

::RuboCop::Cop::AutocorrectLogic - Included

Instance Method Summary

::RuboCop::Cop::RangeHelp - Included

::RuboCop::Cop::ConfigurableEnforcedStyle - Included

::RuboCop::Cop::Alignment - Included

::RuboCop::Cop::Base - Inherited

::RuboCop::Cop::AutocorrectLogic - Included

::RuboCop::Cop::IgnoredNode - Included

Constructor Details

Instance Method Details

#add_trailing_end(corrector, node, padding) (private)

#autocorrect(corrector, node) (private)

#check_compact_style(node, body) (private)

#check_nested_style(node) (private)

#check_style(node, body) (private)

#compact_definition(corrector, node) (private)

#compact_identifier_name(node) (private)

#compact_node(corrector, node) (private)

#compact_node_name?(node) ⇒ Boolean (private)

#compact_replacement(node) (private)

#leading_spaces(node) (private)

#needs_compacting?(body) ⇒ Boolean (private)

#nest_definition(corrector, node) (private)

#nest_or_compact(corrector, node) (private)

#on_class(node)

#on_module(node)

#remove_end(corrector, body) (private)

#replace_namespace_keyword(corrector, node) (private)

#split_on_double_colon(corrector, node, padding) (private)

#unindent(corrector, node) (private)

`::RuboCop::Cop::Base` - Inherited

`::RuboCop::Cop::Alignment` - Included

`::RuboCop::Cop::ConfigurableEnforcedStyle` - Included

`::RuboCop::Cop::RangeHelp` - Included

`::RuboCop::Cop::AutoCorrector` - Extended

`::RuboCop::Cop::Base` - Inherited

`::RuboCop::Cop::Base` - Inherited

`::RuboCop::ExcludeLimit` - Extended

`::RuboCop::Cop::ConfigurableEnforcedStyle` - Included

`::RuboCop::Cop::Alignment` - Included

`::RuboCop::Cop::Base` - Inherited

`::RuboCop::Cop::AutocorrectLogic` - Included

`::RuboCop::Cop::RangeHelp` - Included

`::RuboCop::Cop::ConfigurableEnforcedStyle` - Included

`::RuboCop::Cop::Alignment` - Included

`::RuboCop::Cop::Base` - Inherited

`::RuboCop::Cop::AutocorrectLogic` - Included

`::RuboCop::Cop::IgnoredNode` - Included

#compact_node_name?(node) ⇒ `Boolean` (private)

#needs_compacting?(body) ⇒ `Boolean` (private)