Function cleanPath

flow/Platform.actor.cpp:2456–2492

StringRef dotdot = LiteralStringRef("..");

std::string cleanPath(std::string const& path) {
	std::vector<StringRef> finalParts;
	bool absolute = !path.empty() && path[0] == CANONICAL_PATH_SEPARATOR;

	StringRef p(path);

	while (p.size() != 0) {
		StringRef part = p.eat(separator);
		if (part.size() == 0 || (part.size() == 1 && part[0] == '.'))
			continue;
		if (part == dotdot) {
			if (!finalParts.empty() && finalParts.back() != dotdot) {
				finalParts.pop_back();
				continue;
			}
			if (absolute) {
				continue;
			}
		}
		finalParts.push_back(part);
	}

	std::string result;
	result.reserve(PATH_MAX);
	if (absolute) {
		result.append(1, CANONICAL_PATH_SEPARATOR);
	}

	for (int i = 0; i < finalParts.size(); ++i) {
		if (i != 0) {
			result.append(1, CANONICAL_PATH_SEPARATOR);
		}
		result.append((const char*)finalParts[i].begin(), finalParts[i].size());
	}

	return result.empty() ? "." : result;
}

std::string popPath(const std::string& path) {
	int i = path.size() - 1;