class Phlex::HTML

def _build_attributes(attributes, buffer:)
	attributes.each do |k, v|
		next unless v
		name = case k
			when String then k
			when Symbol then k.name.tr("_", "-")
			else k.to_s
		end
		# Detect unsafe attribute names. Attribute names are considered unsafe if they match an event attribute or include unsafe characters.
		if HTML::EVENT_ATTRIBUTES[name] || name.match?(/[<>&"']/)
			raise ArgumentError, "Unsafe attribute name detected: #{k}."
		end
		case v
		when true
			buffer << " " << name
		when String
			buffer << " " << name << '="' << ERB::Util.html_escape(v) << '"'
		when Symbol
			buffer << " " << name << '="' << ERB::Util.html_escape(v.name) << '"'
		when Hash
			_build_attributes(v.transform_keys { "#{k}-#{_1.name.tr('_', '-')}" }, buffer: buffer)
		else
			buffer << " " << name << '="' << ERB::Util.html_escape(v.to_s) << '"'
		end
	end
	buffer
end