Aegisub/libaegisub/common/json.cpp

// Copyright (c) 2010, Amar Takhar <verm@aegisub.org>
//
// Permission to use, copy, modify, and distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice appear in all copies.
//
// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

/// @file json.cpp
/// @brief Parse JSON files and return json::UnknownElement
/// @ingroup libaegisub io

#include "libaegisub/json.h"

#include "libaegisub/cajun/reader.h"
#include "libaegisub/fs.h"
#include "libaegisub/io.h"
#include "libaegisub/log.h"

#include <boost/interprocess/streams/bufferstream.hpp>

namespace agi {
	namespace json_util {

json::UnknownElement parse(std::istream &stream) {
	try {
		json::UnknownElement root;
		json::Reader::Read(root, stream);
		return root;
	} catch (json::Reader::ParseException& e) {
		LOG_E("json/parse") << "json::ParseException: " << e.what() << ", Line/offset: " << e.m_locTokenBegin.m_nLine + 1 << '/' << e.m_locTokenBegin.m_nLineOffset + 1;
		throw;
	} catch (json::Exception& e) {
		LOG_E("json/parse") << "json::Exception: " << e.what();
		throw;
	}
}

json::UnknownElement file(agi::fs::path const& file) {
	return parse(*io::Open(file));
}

json::UnknownElement file(agi::fs::path const& file, std::pair<const char *, size_t> default_config) {
	try {
		return parse(*io::Open(file));
	}
	catch (fs::FileNotFound const&) {
		// Not an error
		boost::interprocess::ibufferstream stream(default_config.first, default_config.second);
		return parse(stream);
	}
	catch (json::Exception&) {
		// Already logged in parse
		boost::interprocess::ibufferstream stream(default_config.first, default_config.second);
		return parse(stream);
	}
	catch (agi::Exception& e) {
		LOG_E("json/file") << "Unexpected error when reading config file " << file << ": " << e.GetMessage();
		boost::interprocess::ibufferstream stream(default_config.first, default_config.second);
		return parse(stream);
	}
}

	} // namespace json_util
} // namespace agi