# Cut `path` into `UriParts`.
	private fun parse_pattern(path: nullable String) do
		if path == null then return
		path = standardize_path(path)
		var parts = path.split("/")
		for part in parts do
			if not part.is_empty and part.first == ':' then
				# is an uri param
				var name = part.substring(1, part.length)
				var param = new UriParam(name)
				pattern_parts.add param
			else
				# is a standard string
				pattern_parts.add new UriString(part)
			end
		end
	end