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Class: RuboCop::Cop::Style::RedundantConditional

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/redundant_conditional.rb

Overview

Checks for redundant returning of true/false in conditionals.

Examples:

# bad
x == y ? true : false

# bad
if x == y
  true
else
  false
end

# good
x == y

# bad
x == y ? false : true

# good
x != y

Constant Summary

::RuboCop::Cop::Base - Inherited

EMPTY_OFFENSES, RESTRICT_ON_SEND

::RuboCop::Cop::Alignment - Included

SPACE

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::Alignment - 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 Method Details

#indented_else_node(expression, node) (private)

[ GitHub ]

  
# File 'lib/rubocop/cop/style/redundant_conditional.rb', line 78

def indented_else_node(expression, node)
  "else\n#{indentation(node)}#{expression}"
end

#message(node) (private)

[ GitHub ]

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

def message(node)
  replacement = replacement_condition(node)
  msg = node.elsif? ? "\n#{replacement}" : replacement

  format(MSG, msg: msg)
end

#offense?(node) ⇒ Boolean (private)

[ GitHub ]

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

def offense?(node)
  return false if node.modifier_form?

  redundant_condition?(node) || redundant_condition_inverted?(node)
end

#on_if(node)

[ GitHub ]

  
# File 'lib/rubocop/cop/style/redundant_conditional.rb', line 36

def on_if(node)
  return unless offense?(node)

  message = message(node)

  add_offense(node, message: message) do |corrector|
    corrector.replace(node, replacement_condition(node))
  end
end

#redundant_condition?(node) (private)

[ GitHub ]

  
# File 'lib/rubocop/cop/style/redundant_conditional.rb', line 56

def_node_matcher :redundant_condition?, <<~RUBY
  (if (send _ #{COMPARISON_OPERATOR_MATCHER} _) true false)
RUBY

#redundant_condition_inverted?(node) (private)

[ GitHub ]

  
# File 'lib/rubocop/cop/style/redundant_conditional.rb', line 61

def_node_matcher :redundant_condition_inverted?, <<~RUBY
  (if (send _ #{COMPARISON_OPERATOR_MATCHER} _) false true)
RUBY

#replacement_condition(node) (private)

[ GitHub ]

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

def replacement_condition(node)
  condition = node.condition.source
  expression = redundant_condition_inverted?(node) ? "!(#{condition})" : condition

  node.elsif? ? indented_else_node(expression, node) : expression
end