class Capybara::Selector::CSSBuilder

def attribute_conditions(attributes)
  attributes.map do |attribute, value|
    case value
    when XPath::Expression
      raise ArgumentError, "XPath expressions are not supported for the :#{attribute} filter with CSS based selectors"
    when Regexp
      Selector::RegexpDisassembler.new(value).substrings.map do |str|
        "[#{attribute}*='#{str}'#{' i' if value.casefold?}]"
      end.join
    when true
      "[#{attribute}]"
    when false
      ':not([attribute])'
    else
      if attribute == :id
        "##{::Capybara::Selector::CSS.escape(value)}"
      else
        "[#{attribute}='#{value}']"
      end
    end
  end.join
end