Class: RuboCop::Cop::Style::ZeroLengthPredicate
- Defined in:
- lib/rubocop/cop/style/zero_length_predicate.rb
Overview
This cop checks for receiver.length == 0 predicates and the negated versions receiver.length > 0 and receiver.length != 0. These can be replaced with receiver.empty? and !receiver.empty? respectively.
Constant Summary collapse
- ZERO_MSG =
'Use `empty?` instead of `%s %s %s`.'.freeze
- NONZERO_MSG =
'Use `!empty?` instead of `%s %s %s`.'.freeze
Constants included from Util
Util::ASGN_NODES, Util::BYTE_ORDER_MARK, Util::CONDITIONAL_NODES, Util::EQUALS_ASGN_NODES, Util::LITERAL_REGEX, Util::LOGICAL_OPERATOR_NODES, Util::MODIFIER_NODES, Util::OPERATOR_METHODS, Util::SHORTHAND_ASGN_NODES
Instance Attribute Summary
Attributes inherited from Cop
#config, #corrections, #offenses, #processed_source
Instance Method Summary collapse
Methods inherited from Cop
#add_offense, all, badge, #config_to_allow_offenses, #config_to_allow_offenses=, #cop_config, #cop_name, cop_name, #correct, department, #duplicate_location?, #excluded_file?, #find_location, #highlights, inherited, #initialize, #join_force?, lint?, match?, #message, #messages, non_rails, #parse, qualified_cop_name, #relevant_file?, #target_ruby_version
Methods included from AST::Sexp
Methods included from NodePattern::Macros
#def_node_matcher, #def_node_search, #node_search, #node_search_all, #node_search_body, #node_search_first
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?, compatible_external_encoding_for?, directions, double_quotes_acceptable?, double_quotes_required?, effective_column, ends_its_line?, escape_string, first_part_of_call_chain, hard_to_type?, interpret_string_escapes, line_distance, line_range, move_pos, needs_escaping?, numeric_range_size, on_node, operator?, parentheses?, parenthesized_call?, preceed?, range_between, range_with_surrounding_comma, range_with_surrounding_space, same_line?, source_range, strip_quotes, stripped_source_upto, to_string_literal, to_supported_styles, to_symbol_literal, within_node?
Methods included from PathUtil
absolute?, match_path?, relative_path
Constructor Details
This class inherits a constructor from RuboCop::Cop::Cop
Instance Method Details
#autocorrect(node) ⇒ Object
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# File 'lib/rubocop/cop/style/zero_length_predicate.rb', line 56 def autocorrect(node) lambda do |corrector| corrector.replace(node.loc.expression, replacement(node)) end end |
#on_send(node) ⇒ Object
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# File 'lib/rubocop/cop/style/zero_length_predicate.rb', line 26 def on_send(node) zero_length_predicate = zero_length_predicate(node) if zero_length_predicate add_offense(node, :expression, format(ZERO_MSG, *zero_length_predicate)) end nonzero_length_predicate = nonzero_length_predicate(node) # rubocop:disable Style/GuardClause if nonzero_length_predicate add_offense(node, :expression, format(NONZERO_MSG, *nonzero_length_predicate)) end # rubocop:enable Style/GuardClause end |
#replacement(node) ⇒ Object
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# File 'lib/rubocop/cop/style/zero_length_predicate.rb', line 62 def replacement(node) receiver = zero_length_receiver(node) return "#{receiver.source}.empty?" if receiver "!#{other_receiver(node).source}.empty?" end |