[mqtt-client] boost-like project folder structure

Summary: resolves T12767

Reviewers: ivica

Reviewed By: ivica

Subscribers: miljen

Tags: #spacetime

Maniphest Tasks: T12767

Differential Revision: https://repo.mireo.local/D25970

test/experimental/uri_parse.cpp

@@ -0,0 +1,46 @@
+#include <boost/spirit/home/x3.hpp>
+
+template <typename T>
+static constexpr auto to_(T& arg) {
+	return [&](auto& ctx) { arg = boost::spirit::x3::_attr(ctx); };
+}
+
+template <typename T, typename Parser>
+static constexpr auto as_(Parser&& p){
+	return boost::spirit::x3::rule<struct _, T>{} = std::forward<Parser>(p);
+}
+
+void test_uri_parser(){
+	struct authority_path { std::string host, port, path; };
+	std::vector<authority_path> _servers;
+
+	std::string brokers = "iot.fcluster.mireo.hr:1234, fc/nesto";
+	std::string default_port = "8883";
+
+	namespace x3 = boost::spirit::x3;
+
+	std::string host, port, path;
+
+	// loosely based on RFC 3986
+	auto unreserved_ = x3::char_("-a-zA-Z_0-9._~");
+	auto digit_ = x3::char_("0-9");
+	auto separator_ = x3::char_(',');
+
+	auto host_ = as_<std::string>(+unreserved_)[to_(host)];
+	auto port_ = as_<std::string>(':' >> +digit_)[to_(port)];
+	auto path_ = as_<std::string>('/' >> *unreserved_)[to_(path)];
+	auto uri_ = *x3::omit[x3::space] >> (host_ >> *port_ >> *path_) >> 
+		(*x3::omit[x3::space] >> x3::omit[separator_ | x3::eoi]);
+
+	for (auto b = brokers.begin(); b != brokers.end(); ) {
+		host.clear(); port.clear(); path.clear();
+		if (phrase_parse(b, brokers.end(), uri_, x3::eps(false))) {
+			_servers.push_back({ 
+				std::move(host), port.empty() ? default_port : std::move(port),
+				std::move(path)
+			});
+		}
+		else b = brokers.end();
+	}
+}
+