/**

 * Relational pipes

 * Copyright © 2021 František Kučera (Frantovo.cz, GlobalCode.info)

 *

 * This program is free software: you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation, version 3 of the License.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program. If not, see <http://www.gnu.org/licenses/>.

 */

#include "AbstractParser.h"

#include "TransactionalBuffer.h"

namespace relpipe {

namespace in {

namespace asn1 {

namespace lib {

class AbstractParserImpl {

private:

	friend AbstractParser;

	AbstractParser* interface;

	TransactionalBuffer buffer;

public:

	AbstractParserImpl(AbstractParser* interface) : interface(interface) {

	}

	virtual ~AbstractParserImpl() {

	}

};

AbstractParser::AbstractParser() {

	implementation = new AbstractParserImpl(this);

}

AbstractParser::~AbstractParser() {

	delete implementation;

}

void AbstractParser::write(const uint8_t* buffer, const size_t length) {

	try {

		// TODO: do not write to the buffer, just append in read()/peek() and write just the part that was not read during this cycle

		implementation->buffer.write(buffer, length);

		// TODO: call an overridable method to get preferred minimum block size and run cycle only if we have enough data or EOF

		// and/or remember the length of last failed (rollbacked) read() call

		update();

		commit();

	} catch (const TransactionalBuffer::ReadBufferUnderflowException& e) {

		rollback();

	} catch (const AbstractParser::ExplicitRollbackException& e) {

		rollback();

	}

}

void AbstractParser::close() {

	// TODO: check remaining data + call update() or just let parsers override this method?

}

void AbstractParser::rollback() {

	// TODO: notify rollback listeners? (they can monitor the performance / frequency of rollbacks)

	implementation->buffer.rollbackRead();

}

void AbstractParser::commit() {

	implementation->buffer.commitRead();

}

void AbstractParser::read(uint8_t* buffer, const size_t length) {

	implementation->buffer.read(buffer, length);

}

void AbstractParser::peek(uint8_t* buffer, const size_t length) {

	implementation->buffer.read(buffer, length);

}

}

}

}

}