//
// This file is part of Kepka,
// an unofficial desktop version of Telegram messaging app,
// see https://github.com/procxx/kepka
//
// Kepka 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, either version 3 of the License, or
// (at your option) any later version.
//
// It 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.
//
// In addition, as a special exception, the copyright holders give permission
// to link the code of portions of this program with the OpenSSL library.
//
// Full license: https://github.com/procxx/kepka/blob/master/LICENSE
// Copyright (c) 2014-2017 John Preston, https://desktop.telegram.org
// Copyright (c) 2017- Kepka Contributors, https://github.com/procxx
//
#pragma once

#include <QtCore/QString>

#include "codegen/common/clean_file.h"

namespace codegen {
namespace common {

// Wrapper allows you to read forward the CleanFile without overflow checks.
class CleanFileReader {
public:
	explicit CleanFileReader(const QString &filepath)
	    : file_(filepath) {}
	explicit CleanFileReader(const QByteArray &content, const QString &filepath = QString())
	    : file_(content, filepath) {}

	bool read() {
		if (!file_.read()) {
			return false;
		}
		pos_ = file_.data();
		end_ = file_.end();
		return true;
	}
	bool atEnd() const {
		return (pos_ == end_);
	}
	char currentChar() const {
		return atEnd() ? 0 : *pos_;
	}
	bool skipChar() {
		if (atEnd()) {
			return false;
		}
		++pos_;
		return true;
	}
	const char *currentPtr() const {
		return pos_;
	}
	int charsLeft() const {
		return (end_ - pos_);
	}

	QVector<QByteArray> singleLineComments() const {
		return file_.singleLineComments();
	}

	// Log error to std::cerr with 'code' at line number 'line' in data().
	LogStream logError(int code, int line) const {
		return std::forward<LogStream>(file_.logError(code, line));
	}


private:
	CleanFile file_;
	const char *pos_ = nullptr;
	const char *end_ = nullptr;
};

} // namespace common
} // namespace codegen