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Class: RuboCop::Cop::Lint::SafeNavigationConsistency

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::NilMethods, ::RuboCop::Cop::AllowedMethods, ::RuboCop::Cop::Base, ::RuboCop::Cop::AutocorrectLogic, ::RuboCop::Cop::IgnoredNode, ::RuboCop::Util, RuboCop::AST::Sexp
Inherits: RuboCop::Cop::Base
Defined in: lib/rubocop/cop/lint/safe_navigation_consistency.rb

Overview

Check to make sure that if safe navigation is used in an && or {||} condition, consistent and appropriate safe navigation, without excess or deficiency, is used for all method calls on the same object.

Examples:

# bad
foo&.bar && foo&.baz

# good
foo&.bar && foo.baz

# bad
foo.bar && foo&.baz

# good
foo.bar && foo.baz

# bad
foo&.bar || foo.baz

# good
foo&.bar || foo&.baz

# bad
foo.bar || foo&.baz

# good
foo.bar || foo.baz

# bad
foo&.bar && (foobar.baz || foo&.baz)

# good
foo&.bar && (foobar.baz || foo.baz)

Constant Summary

::RuboCop::Cop::Base - Inherited

EMPTY_OFFENSES, RESTRICT_ON_SEND

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.

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 a 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

::RuboCop::Cop::AllowedMethods - Included

#ignored_method?

::RuboCop::Cop::Base - Inherited

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

::RuboCop::Cop::NilMethods - Included

#nil_methods, #other_stdlib_methods

::RuboCop::Cop::AllowedMethods - Included

#allowed_method?, #allowed_methods, #cop_config_allowed_methods, #cop_config_deprecated_values

::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

#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, #range_overlaps_offense?, #string_continuation, #string_continuation?, #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

#already_appropriate_call?(operand, dot_op) ⇒ Boolean (private)

Metrics/PerceivedComplexity

[ GitHub ] 

  


# File 'lib/rubocop/cop/lint/safe_navigation_consistency.rb', line 98



def already_appropriate_call?(operand, dot_op)
  return true if operand.safe_navigation? && dot_op == '&.'

  (operand.dot? || operand.operator_method?) && dot_op == '.'
end


  








  

    #collect_operands(node, operand_nodes)   (private)
  

  [ GitHub ]


  

  


# File 'lib/rubocop/cop/lint/safe_navigation_consistency.rb', line 67



def collect_operands(node, operand_nodes)
  operand_nodes(node.lhs, operand_nodes)
  operand_nodes(node.rhs, operand_nodes)

  operand_nodes
end


  








  

    #find_consistent_parts(grouped_operands)   (private)
  



  

    


Metrics/PerceivedComplexity



  



  [ GitHub ]


  

  


# File 'lib/rubocop/cop/lint/safe_navigation_consistency.rb', line 83



def find_consistent_parts(grouped_operands)
  csend_in_and, csend_in_or, send_in_and, send_in_or = most_left_indices(grouped_operands)

  return if csend_in_and && csend_in_or && csend_in_and < csend_in_or

  if csend_in_and
    ['.', (send_in_and ? [send_in_and, csend_in_and].min : csend_in_and) + 1]
  elsif send_in_or && csend_in_or
    send_in_or < csend_in_or ? ['.', send_in_or + 1] : ['&.', csend_in_or + 1]
  elsif send_in_and && csend_in_or && send_in_and < csend_in_or
    ['.', csend_in_or]
  end
end


  








  

    #most_left_indices(grouped_operands)   (private)
  



  

    


Metrics/CyclomaticComplexity, Metrics/PerceivedComplexity



  



  [ GitHub ]


  

  


# File 'lib/rubocop/cop/lint/safe_navigation_consistency.rb', line 124



def most_left_indices(grouped_operands)
  indices = { csend_in_and: nil, csend_in_or: nil, send_in_and: nil, send_in_or: nil }

  grouped_operands.each_with_index do |operand, index|
    indices[:csend_in_and] ||= index if operand_in_and?(operand) && operand.csend_type?
    indices[:csend_in_or] ||= index if operand_in_or?(operand) && operand.csend_type?
    indices[:send_in_and] ||= index if operand_in_and?(operand) && !nilable?(operand)
    indices[:send_in_or] ||= index if operand_in_or?(operand) && !nilable?(operand)
  end

  indices.values
end


  








  

    #nilable?(node)  ⇒ Boolean  (private)
  



  

    
  





  


  [ GitHub ]


  

  


# File 'lib/rubocop/cop/lint/safe_navigation_consistency.rb', line 154



def nilable?(node)
  node.csend_type? || nil_methods.include?(node.method_name)
end


  








  

    #on_and(node)  
    Also known as: #on_or
  

  [ GitHub ]


  

  


# File 'lib/rubocop/cop/lint/safe_navigation_consistency.rb', line 48



def on_and(node)
  all_operands = collect_operands(node, [])
  operand_groups = all_operands.group_by { |operand| receiver_name_as_key(operand, +'') }

  operand_groups.each_value do |grouped_operands|
    next unless (dot_op, begin_of_rest_operands = find_consistent_parts(grouped_operands))

    rest_operands = grouped_operands[begin_of_rest_operands..]
    rest_operands.each do |operand|
      next if already_appropriate_call?(operand, dot_op)

      register_offense(operand, dot_op)
    end
  end
end


  








  

    #on_or(node)  
  



  

    


Alias for #on_and.



  



  [ GitHub ]


  

  


# File 'lib/rubocop/cop/lint/safe_navigation_consistency.rb', line 63



alias on_or on_and


  








  

    #operand_in_and?(node)  ⇒ Boolean  (private)
  



  

    


Metrics/CyclomaticComplexity, Metrics/PerceivedComplexity



  





  


  [ GitHub ]


  

  


# File 'lib/rubocop/cop/lint/safe_navigation_consistency.rb', line 138



def operand_in_and?(node)
  return true if node.parent.and_type?

  parent = node.parent.parent while node.parent.begin_type?

  parent&.and_type?
end


  








  

    #operand_in_or?(node)  ⇒ Boolean  (private)
  



  

    
  





  


  [ GitHub ]


  

  


# File 'lib/rubocop/cop/lint/safe_navigation_consistency.rb', line 146



def operand_in_or?(node)
  return true if node.parent.or_type?

  parent = node.parent.parent while node.parent.begin_type?

  parent&.or_type?
end


  








  

    #operand_nodes(operand, operand_nodes)   (private)
  

  [ GitHub ]


  

  


# File 'lib/rubocop/cop/lint/safe_navigation_consistency.rb', line 115



def operand_nodes(operand, operand_nodes)
  if operand.operator_keyword?
    collect_operands(operand, operand_nodes)
  elsif operand.call_type?
    operand_nodes << operand
  end
end


  








  

    #receiver_name_as_key(method, fully_receivers)   (private)
  

  [ GitHub ]


  

  


# File 'lib/rubocop/cop/lint/safe_navigation_consistency.rb', line 74



def receiver_name_as_key(method, fully_receivers)
  if method.parent.call_type?
    receiver(method.parent, fully_receivers)
  else
    fully_receivers << method.receiver&.source.to_s
  end
end


  








  

    #register_offense(operand, dot_operator)   (private)
  

  [ GitHub ]


  

  


# File 'lib/rubocop/cop/lint/safe_navigation_consistency.rb', line 104



def register_offense(operand, dot_operator)
  offense_range = operand.operator_method? ? operand : operand.loc.dot
  message = dot_operator == '.' ? USE_DOT_MSG : USE_SAFE_NAVIGATION_MSG

  add_offense(offense_range, message: message) do |corrector|
    next if operand.operator_method?

    corrector.replace(operand.loc.dot, dot_operator)
  end
end