Class: RuboCop::Cop::Lint::DuplicatedKey

Inherits:
Cop
  • Object
show all
Defined in:
lib/rubocop/cop/lint/duplicated_key.rb

Overview

This cop checks for duplicated keys in hash literals.

This cop mirrors a warning in Ruby 2.2.

Examples:

hash = { food: 'apple', food: 'orange' }

Constant Summary collapse

MSG = 
'Duplicated key in hash literal.'.freeze
LITERALS = 
[:sym, :str, :float, :int].freeze

Constants included from Util

Util::ASGN_NODES, Util::EQUALS_ASGN_NODES, Util::LITERAL_REGEX, Util::OPERATOR_METHODS, Util::SHORTHAND_ASGN_NODES, Util::STRING_ESCAPES, Util::STRING_ESCAPE_REGEX

Instance Attribute Summary

Attributes inherited from Cop

#config, #corrections, #offenses, #processed_source

Instance Method Summary collapse

Methods inherited from Cop

#add_offense, all, #config_to_allow_offenses, #config_to_allow_offenses=, #cop_config, cop_name, #cop_name, cop_type, #correct, #debug?, #details, #display_cop_names?, #display_style_guide?, #excluded_file?, #extra_details?, inherited, #initialize, #join_force?, lint?, match?, #message, non_rails, #parse, qualified_cop_name, #reference_url, #relevant_file?, #style_guide_url, #target_ruby_version

Methods included from Sexp

#s

Methods included from NodePattern::Macros

#def_node_matcher, #def_node_search, #node_search_body

Methods included from AutocorrectLogic

#autocorrect?, #autocorrect_enabled?, #autocorrect_requested?, #support_autocorrect?

Methods included from IgnoredNode

#ignore_node, #ignored_node?, #part_of_ignored_node?

Methods included from Util

begins_its_line?, block_length, comment_line?, directions, double_quotes_acceptable?, double_quotes_required?, ends_its_line?, first_part_of_call_chain, interpret_string_escapes, line_range, move_pos, numeric_range_size, on_node, operator?, parentheses?, range_with_surrounding_comma, range_with_surrounding_space, source_range, strip_quotes, to_string_literal, to_symbol_literal, within_node?

Methods included from PathUtil

hidden?, issue_deprecation_warning, match_path?, relative_path

Constructor Details

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

Instance Method Details

#on_hash(node) ⇒ Object 



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# File 'lib/rubocop/cop/lint/duplicated_key.rb', line 18

def on_hash(node)
  keys = []

  hash_pairs = *node
  hash_pairs.each do |pair|
    key, _value = *pair
    if keys.include?(key) && LITERALS.include?(key.type)
      add_offense(key, :expression)
    elsif keys.include?(key) && key.type == :array
      key.children.each do |child|
        return false unless LITERALS.include?(child.type)
      end
      add_offense(key, :expression)
    end
    keys << key
  end
end