module RuboCop::Cop::Style::ConditionalAssignmentHelper

def lhs_for_send(node)
  receiver = node.receiver ? node.receiver.source : ''
  if node.method?(:[]=)
    indices = node.arguments[0...-1].map(&:source).join(', ')
    "#{receiver}[#{indices}] = "
  elsif node.setter_method?
    "#{receiver}.#{node.method_name[0...-1]} = "
  else
    "#{receiver} #{node.method_name} "
  end
end