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Class: RuboCop::Cop::Style::EmptyMethod

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:
Inherits: RuboCop::Cop::Base
Defined in: lib/rubocop/cop/style/empty_method.rb

Overview

Checks for the formatting of empty method definitions. By default it enforces empty method definitions to go on a single line (compact style), but it can be configured to enforce the end to go on its own line (expanded style).

Note
A method definition is not considered empty if it contains comments.
Note
Autocorrection will not be applied for the compact style if the resulting code is longer than the Max configuration for Layout/LineLength, but an offense will still be registered.

Examples:

EnforcedStyle: compact (default)

# bad
def foo(bar)
end

def self.foo(bar)
end

# good
def foo(bar); end

def foo(bar)
  # baz
end

def self.foo(bar); end

EnforcedStyle: expanded

# bad
def foo(bar); end

def self.foo(bar); end

# good
def foo(bar)
end

def self.foo(bar)
end

Constant Summary

::RuboCop::Cop::Base - Inherited

EMPTY_OFFENSES, RESTRICT_ON_SEND

::RuboCop::Cop::ConfigurableEnforcedStyle - Included

SYMBOL_TO_STRING_CACHE

Class Attribute Summary

::RuboCop::Cop::AutoCorrector - Extended

::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.

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

Returns an url to view this cops documentation online.

.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

Instance Method Summary

::RuboCop::Cop::ConfigurableEnforcedStyle - Included

::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

Actually private methods.

#use_corrector

::RuboCop::Cop::AutocorrectLogic - Included

::RuboCop::Cop::IgnoredNode - Included

Constructor Details

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

Instance Attribute Details

#compact_style?Boolean (readonly, private)

[ GitHub ]

  
# File 'lib/rubocop/cop/style/empty_method.rb', line 103

def compact_style?
  style == :compact
end

#expanded_style?Boolean (readonly, private)

[ GitHub ]

  
# File 'lib/rubocop/cop/style/empty_method.rb', line 107

def expanded_style?
  style == :expanded
end

Instance Method Details

#compact?(node) ⇒ Boolean (private)

[ GitHub ]

  
# File 'lib/rubocop/cop/style/empty_method.rb', line 95

def compact?(node)
  node.single_line?
end

#correct_style?(node) ⇒ Boolean (private)

[ GitHub ]

  
# File 'lib/rubocop/cop/style/empty_method.rb', line 73

def correct_style?(node)
  (compact_style? && compact?(node)) || (expanded_style? && expanded?(node))
end

#corrected(node) (private)

[ GitHub ]

  
# File 'lib/rubocop/cop/style/empty_method.rb', line 77

def corrected(node)
  scope = node.receiver ? "#{node.receiver.source}." : ''
  arguments = if node.arguments?
                args = node.arguments.map(&:source).join(', ')

                parentheses?(node.arguments) ? "(#{args})" : " #{args}"
              end
  signature = [scope, node.method_name, arguments].join

  ["def #{signature}", 'end'].join(joint(node))
end

#expanded?(node) ⇒ Boolean (private)

[ GitHub ]

  
# File 'lib/rubocop/cop/style/empty_method.rb', line 99

def expanded?(node)
  node.multiline?
end

#joint(node) (private)

[ GitHub ]

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

def joint(node)
  indent = ' ' * node.loc.column

  compact_style? ? '; ' : "\n#{indent}"
end

#max_line_length (private)

[ GitHub ]

  
# File 'lib/rubocop/cop/style/empty_method.rb', line 111

def max_line_length
  return unless config.for_cop('Layout/LineLength')['Enabled']

  config.for_cop('Layout/LineLength')['Max']
end

#message(_range) (private)

[ GitHub ]

  
# File 'lib/rubocop/cop/style/empty_method.rb', line 69

def message(_range)
  compact_style? ? MSG_COMPACT : MSG_EXPANDED
end

#on_def(node) Also known as: #on_defs

[ GitHub ]

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

def on_def(node)
  return if node.body || processed_source.contains_comment?(node.source_range)
  return if correct_style?(node)

  add_offense(node) do |corrector|
    correction = corrected(node)
    next if compact_style? && max_line_length && correction.size > max_line_length

    corrector.replace(node, correction)
  end
end

#on_defs(node)

Alias for #on_def.

[ GitHub ]

  
# File 'lib/rubocop/cop/style/empty_method.rb', line 65

alias on_defs on_def