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Class: RuboCop::Cop::Lint::DuplicateSetElement

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

Overview

Checks for duplicate literal, constant, or variable elements in Set and SortedSet.

Examples:

# bad
Set[:foo, :bar, :foo]

# good
Set[:foo, :bar]

# bad
Set.new([:foo, :bar, :foo])

# good
Set.new([:foo, :bar])

# bad
[:foo, :bar, :foo].to_set

# good
[:foo, :bar].to_set

# bad
SortedSet[:foo, :bar, :foo]

# good
SortedSet[:foo, :bar]

# bad
SortedSet.new([:foo, :bar, :foo])

# good
SortedSet.new([:foo, :bar])

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::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::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_gem_version

Returns a gems locked versions (i.e.
#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, #heredoc_range, #max_line_length, #multiline_ranges, #multiline_string?,
#range_by_lines

Expand the given range to include all of any lines it covers.
#range_of_first_line, #range_overlaps_offense?, #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

#on_csend(node)

Alias for #on_send.

[ GitHub ] 

  


# File 'lib/rubocop/cop/lint/duplicate_set_element.rb', line 71



alias on_csend on_send


  








  

    #on_send(node)  
    Also known as: #on_csend
  

  [ GitHub ]


  

  


# File 'lib/rubocop/cop/lint/duplicate_set_element.rb', line 54



def on_send(node)
  return unless (set_elements = set_init_elements(node))

  seen_elements = Set[]

  set_elements.each_with_index do |set_element, index|
    # NOTE: Skip due to the possibility of corner cases where Set elements
    # may have changing return values if they are not literals, constants, or variables.
    next if !set_element.literal? && !set_element.const_type? && !set_element.variable?

    if seen_elements.include?(set_element)
      register_offense(set_element, set_elements[index - 1], node)
    else
      seen_elements << set_element
    end
  end
end


  








  

    #register_offense(current_element, prev_element, node)   (private)
  

  [ GitHub ]


  

  


# File 'lib/rubocop/cop/lint/duplicate_set_element.rb', line 75



def register_offense(current_element, prev_element, node)
  class_name = node.receiver.const_type? ? node.receiver.const_name : 'Set'

  add_offense(current_element, message: format(MSG, class_name: class_name)) do |corrector|
    range = prev_element.source_range.end.join(current_element.source_range.end)

    corrector.remove(range)
  end
end


  








  

    #set_init_elements(node)  
  

  [ GitHub ]


  

  


# File 'lib/rubocop/cop/lint/duplicate_set_element.rb', line 46



def_node_matcher :set_init_elements, <<~PATTERN
  {
    (send (const {nil? cbase} {:Set :SortedSet}) :[] $...)
    (send (const {nil? cbase} {:Set :SortedSet}) :new (array $...))
    (call (array $...) :to_set)
  }
PATTERN