This class tracks variable assignments in a method body and if a variable contains object passed as argument at the end of the method.
# File lib/rubocop/cop/lint/useless_setter_call.rb, line 61 def contain_object_passed_as_argument?(variable_name) return @table[variable_name] if @table @table = {} @args_node.children.each do |arg_node| arg_name, = *arg_node @table[arg_name] = true end scan(@body_node) do |node| case node.type when :masgn process_multiple_assignment(node) when :or_asgn, :and_asgn process_logical_operator_assignment(node) when :op_asgn process_binary_operator_assignment(node) when *ASSIGNMENT_TYPES _, rhs_node = *node process_assignment(node, rhs_node) end end @table[variable_name] end
# File lib/rubocop/cop/lint/useless_setter_call.rb, line 135 def process_assignment(asgn_node, rhs_node) lhs_variable_name, = *asgn_node if [:lvar, :ivar, :cvar, :gvar].include?(rhs_node.type) rhs_variable_name, = *rhs_node @table[lhs_variable_name] = @table[rhs_variable_name] else @table[lhs_variable_name] = false end end
# File lib/rubocop/cop/lint/useless_setter_call.rb, line 126 def process_binary_operator_assignment(op_asgn_node) lhs_node, = *op_asgn_node return unless ASSIGNMENT_TYPES.include?(lhs_node.type) lhs_variable_name, = *lhs_node @table[lhs_variable_name] = false throw :skip_children end
# File lib/rubocop/cop/lint/useless_setter_call.rb, line 118 def process_logical_operator_assignment(asgn_node) lhs_node, rhs_node = *asgn_node return unless ASSIGNMENT_TYPES.include?(lhs_node.type) process_assignment(lhs_node, rhs_node) throw :skip_children end
# File lib/rubocop/cop/lint/useless_setter_call.rb, line 99 def process_multiple_assignment(masgn_node) mlhs_node, mrhs_node = *masgn_node mlhs_node.children.each_with_index do |lhs_node, index| next unless ASSIGNMENT_TYPES.include?(lhs_node.type) lhs_variable_name, = *lhs_node rhs_node = mrhs_node.children[index] if mrhs_node.type == :array && rhs_node process_assignment(lhs_variable_name, rhs_node) else @table[lhs_variable_name] = false end end throw :skip_children end
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