Class: RuboCop::Cop::Lint::DuplicateCaseCondition

Inherits:
Base
  • Object
show all
Defined in:
lib/rubocop/cop/lint/duplicate_case_condition.rb

Overview

This cop checks that there are no repeated conditions used in case 'when' expressions.

Examples:


# bad

case x
when 'first'
  do_something
when 'first'
  do_something_else
end

# good

case x
when 'first'
  do_something
when 'second'
  do_something_else
end

Constant Summary collapse

MSG =
'Duplicate `when` condition detected.'

Constants inherited from Base

Base::RESTRICT_ON_SEND

Instance Attribute Summary

Attributes inherited from Base

#config, #processed_source

Instance Method Summary collapse

Methods inherited from Base

#add_global_offense, #add_offense, autocorrect_incompatible_with, badge, #callbacks_needed, callbacks_needed, #config_to_allow_offenses, #config_to_allow_offenses=, #cop_config, #cop_name, cop_name, department, documentation_url, exclude_from_registry, #excluded_file?, #external_dependency_checksum, inherited, #initialize, joining_forces, lint?, match?, #message, #offenses, #on_investigation_end, #on_new_investigation, #on_other_file, #parse, #ready, #relevant_file?, support_autocorrect?, support_multiple_source?, #target_rails_version, #target_ruby_version

Methods included from ExcludeLimit

#exclude_limit

Methods included from AutocorrectLogic

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

Methods included from IgnoredNode

#ignore_node, #ignored_node?, #part_of_ignored_node?

Methods included from Util

silence_warnings

Constructor Details

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

Instance Method Details

#on_case(case_node) ⇒ Object


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# File 'lib/rubocop/cop/lint/duplicate_case_condition.rb', line 33

def on_case(case_node)
  case_node.when_branches.each_with_object(Set.new) do |when_node, previous|
    when_node.each_condition do |condition|
      add_offense(condition) unless previous.add?(condition)
    end
  end
end