json格式化

gistfile1.cpp

#include <boost/foreach.hpp>
#include <boost/property_tree/json_parser.hpp>
namespace pt = boost::property_tree;
using pt::ptree;

template <class Stream>
void list_json(ptree json, Stream &stream, int level = 0)
{
  if (level == 0)
	{
		level++;
		stream << "{\n";
	}
	int s = json.size();
	BOOST_FOREACH(ptree::value_type &v, json)
	{
		if (v.second.size() == 0)
		{
			for (int i = 0; i < level; i++)
				stream << "  ";
			stream << "\"" << v.first << "\"" << ":" << "\"" << v.second.get_value<std::string>() << "\"";
			if (s != 1)
				stream << ",";
			stream << std::endl;
		}
		else
		{
			if (v.first != "")
			{
				for (int i = 0; i < level; i++)
					stream << "  ";
				stream << "\"" << v.first << "\"" << ":[" << std::endl;
			}
			else
			{
				for (int i = 0; i < level; i++)
					stream << "  ";
				stream << "{" << std::endl;
			}
			list_json(v.second, stream, level + 1);
			if (v.first != "")
			{
				for (int i = 0; i < level; i++)
					stream << "  ";
				if (s != 1)
					stream << "]," << std::endl;
				else
					stream << "]" << std::endl;
			}
			else
			{
				for (int i = 0; i < level; i++)
					stream << "  ";
				if (s != 1)
					stream << "}," << std::endl;
				else
					stream << "}" << std::endl;
			}
		}
		s--;
	}
	if (level == 1)
	{
		stream << "}";
	}
}