levelparser.cpp

#include<iostream>
#include<string>
#include<boost/property_tree/ptree.hpp>
#include<boost/property_tree/json_parser.hpp>
#include<boost/optional.hpp>

/* input file
{
    "Level":
    {
		"frequency": 0.5,
        "Pattern":
        {
            "Order": { "type": "Wait", "delay": "0.5" },
            "Order": { "type": "Emit", "easing": "2", "z": "0.3", "duration": "0.8" },
            "Order": { "type": "Emit", "easing": "4", "z": "0.3", "duration": "1.2" }
        },
        "Pattern":
        {
            "Order": { "type": "Wait", "delay": "0.2" },
            "Order": { "type": "Emit", "easing": "3", "z": "0.3", "duration": "0.8" },
            "Order": { "type": "Emit", "easing": "1", "z": "0.3", "duration": "1.2" }
        }
    }
}
*/

using namespace boost::property_tree;

int main() {
	ptree pt;
	read_json("out.json", pt);

	for(auto& level: pt.get_child("")) { 
		std::cout << level.first << std::endl;
		auto& orders = level.second.get_child("Pattern");
		auto frequency = level.second.get_optional<float>("frequency");
		std::cout << "freq:" << frequency << std::endl;
		for(auto& order: orders) {
			std::cout << order.first << std::endl;
			std::string type = order.second.get<std::string>("type");
			std::cout << type << std::endl;
			if(type=="Emit") {
				auto easing = order.second.get_optional<int>("easing");
				auto z = order.second.get_optional<float>("z");
				auto duration = order.second.get_optional<float>("duration");
				std::cout << easing << ", " << z << ", " << duration << std::endl;
			}
			else if(type=="Wait"){
				auto delay = order.second.get_optional<float>("delay");
				std::cout << delay << std::endl;
			}
		}
	}

}