Class: RuboCop::Cop::Style::ArrayJoin

Inherits:
Cop
  • Object
show all
Defined in:
lib/rubocop/cop/style/array_join.rb

Overview

This cop checks for uses of "" as a substitute for *join.

Not all cases can reliably checked, due to Ruby's dynamic types, so we consider only cases when the first argument is an array literal or the second is a string literal.

Constant Summary collapse

MSG =
'Favor `Array#join` over `Array#*`.'

Constants included from Util

Util::ASGN_NODES, Util::BASIC_LITERALS, Util::EQUALS_ASGN_NODES, Util::LITERALS, Util::OPERATOR_METHODS, Util::PROC_NEW_NODE, 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, #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, qualified_cop_name, rails?, #reference_url, #relevant_file?, #style_guide_url

Methods included from NodePattern::Macros

#def_node_matcher, #def_node_search

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, command?, comment_line?, const_name, directions, first_part_of_call_chain, lambda?, lambda_or_proc?, line_range, move_pos, numeric_range_size, on_node, operator?, parentheses?, proc?, range_with_surrounding_comma, range_with_surrounding_space, source_range, strip_quotes, 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

#autocorrect(node) ⇒ Object


22
23
24
25
26
27
28
29
30
31
# File 'lib/rubocop/cop/style/array_join.rb', line 22

def autocorrect(node)
  receiver_node, _method_name, *arg_nodes = *node
  expr = node.loc.expression
  array = receiver_node.loc.expression.source
  join_arg  = arg_nodes[0].loc.expression.source

  lambda do |corrector|
    corrector.replace(expr, "#{array}.join(#{join_arg})")
  end
end

#on_send(node) ⇒ Object


14
15
16
17
18
19
20
# File 'lib/rubocop/cop/style/array_join.rb', line 14

def on_send(node)
  receiver_node, method_name, *arg_nodes = *node
  return unless receiver_node && receiver_node.type == :array &&
                method_name == :* && arg_nodes[0].type == :str

  add_offense(node, :selector)
end