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#include "pugixml.hpp"

#include <fstream>
#include <iomanip>
#include <iostream>

void print_doc(const char* message, const pugi::xml_document& doc, const pugi::xml_parse_result& result)
{
	std::cout
		<< message
		<< "\t: load result '" << result.description() << "'"
		<< ", first character of root name: U+" << std::hex << std::uppercase << std::setw(4) << std::setfill('0') << pugi::as_wide(doc.first_child().name())[0]
		<< ", year: " << doc.first_child().first_child().first_child().child_value()
		<< std::endl;
}

bool try_imbue(std::wistream& stream, const char* name)
{
	try
	{
		stream.imbue(std::locale(name));

		return true;
	}
	catch (const std::exception&)
	{
		return false;
	}
}

int main()
{
	pugi::xml_document doc;

	{
	//[code_load_stream
		std::ifstream stream("weekly-utf-8.xml");
		pugi::xml_parse_result result = doc.load(stream);
	//]

		// first character of root name: U+9031, year: 1997
		print_doc("UTF8 file from narrow stream", doc, result);
	}

	{
		std::ifstream stream("weekly-utf-16.xml");
		pugi::xml_parse_result result = doc.load(stream);

		// first character of root name: U+9031, year: 1997
		print_doc("UTF16 file from narrow stream", doc, result);
	}

	{
		// Since wide streams are treated as UTF-16/32 ones, you can't load the UTF-8 file from a wide stream
		// directly if you have localized characters; you'll have to provide a UTF8 locale (there is no
		// standard one; you can use utf8_codecvt_facet from Boost or codecvt_utf8 from C++0x)
		std::wifstream stream("weekly-utf-8.xml");

		if (try_imbue(stream, "en_US.UTF-8")) // try Linux encoding
		{
			pugi::xml_parse_result result = doc.load(stream);

			// first character of root name: U+00E9, year: 1997
			print_doc("UTF8 file from wide stream", doc, result);
		}
		else
		{
			std::cout << "UTF-8 locale is not available\n";
		}
	}

	{
		// Since wide streams are treated as UTF-16/32 ones, you can't load the UTF-16 file from a wide stream without
		// using custom codecvt; you can use codecvt_utf16 from C++0x
	}

	{
		// Since encoding names are non-standard, you can't load the Shift-JIS (or any other non-ASCII) file
		// from a wide stream portably
		std::wifstream stream("weekly-shift_jis.xml");

		if (try_imbue(stream, ".932") || // try Microsoft encoding
			try_imbue(stream, "ja_JP.SJIS")) // try Linux encoding; run "localedef -i ja_JP -c -f SHIFT_JIS /usr/lib/locale/ja_JP.SJIS" to get it
		{
			pugi::xml_parse_result result = doc.load(stream);

			// first character of root name: U+9031, year: 1997
			print_doc("Shift-JIS file from wide stream", doc, result);
		}
		else
		{
			std::cout << "Shift-JIS locale is not available\n";
		}
	}
}