Function ParseIntList

src/settings.cpp:247–272

* Parse a string into a vector of uint32s. * @param str the string to be parsed. Each element in the list is separated by a comma or a space character * @return std::optional with a vector of parsed integers. The optional is empty upon an error. */

 * @return std::optional with a vector of parsed integers. The optional is empty upon an error.
 */
static std::optional<std::vector<uint32_t>> ParseIntList(std::string_view str)
{
	bool comma = false; // do we accept comma?
	std::vector<uint32_t> result;

	StringConsumer consumer{str};
	for (;;) {
		consumer.SkipUntilCharNotIn(StringConsumer::WHITESPACE_NO_NEWLINE);
		if (!consumer.AnyBytesLeft()) break;
		if (comma && consumer.ReadIf(",")) {
			/* commas are optional, but we only accept one between values */
			comma = false;
			continue;
		}
		auto v = consumer.TryReadIntegerBase<uint32_t>(10);
		if (!v.has_value()) return std::nullopt;
		result.push_back(*v);
		comma = true;
	}

	/* If we have read comma but no number after it, fail.
	 * We have read comma when (n != 0) and comma is not allowed */
	if (!result.empty() && !comma) return std::nullopt;

	return result;
}

/**
 * Load parsed string-values into an integer-array (intlist)