Use abstract export writer for different formats.

Telegram/SourceFiles/export/data/export_data_types.cpp

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+/*
+This file is part of Telegram Desktop,
+the official desktop application for the Telegram messaging service.
+
+For license and copyright information please follow this link:
+https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
+*/
+#include "export/data/export_data_types.h"
+
+namespace App { // Hackish..
+QString formatPhone(QString phone);
+} // namespace App
+
+namespace Export {
+namespace Data {
+
+Utf8String ParseString(const MTPstring &data) {
+	return data.v;
+}
+
+PersonalInfo ParsePersonalInfo(const MTPUserFull &data) {
+	Expects(data.type() == mtpc_userFull);
+
+	const auto &fields = data.c_userFull();
+	const auto &small = fields.vuser.c_user();
+	auto result = PersonalInfo();
+	if (small.has_first_name()) {
+		result.firstName = ParseString(small.vfirst_name);
+	}
+	if (small.has_last_name()) {
+		result.lastName = ParseString(small.vlast_name);
+	}
+	if (small.has_phone()) {
+		result.phoneNumber = ParseString(small.vphone);
+	}
+	if (small.has_username()) {
+		result.username = ParseString(small.vusername);
+	}
+	if (fields.has_about()) {
+		result.bio = ParseString(fields.vabout);
+	}
+	return result;
+}
+
+UserpicsSlice ParseUserpicsSlice(const MTPVector<MTPPhoto> &data) {
+	const auto &list = data.v;
+	auto result = UserpicsSlice();
+	result.list.reserve(list.size());
+	for (const auto &photo : list) {
+		switch (photo.type()) {
+		case mtpc_photo: {
+			const auto &fields = photo.c_photo();
+			auto userpic = Userpic();
+			userpic.id = fields.vid.v;
+			userpic.date = QDateTime::fromTime_t(fields.vdate.v);
+			userpic.image = File{ "(not saved)" };
+			result.list.push_back(std::move(userpic));
+		} break;
+
+		case mtpc_photoEmpty: {
+			const auto &fields = photo.c_photoEmpty();
+			auto userpic = Userpic();
+			userpic.id = fields.vid.v;
+			result.list.push_back(std::move(userpic));
+		} break;
+
+		default: Unexpected("Photo type in ParseUserpicsSlice.");
+		}
+	}
+	return result;
+}
+
+Utf8String FormatPhoneNumber(const Utf8String &phoneNumber) {
+	return phoneNumber.isEmpty()
+		? Utf8String()
+		: App::formatPhone(QString::fromUtf8(phoneNumber)).toUtf8();
+}
+
+} // namespace Data
+} // namespace Export

Telegram/SourceFiles/export/data/export_data_types.h

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+/*
+This file is part of Telegram Desktop,
+the official desktop application for the Telegram messaging service.
+
+For license and copyright information please follow this link:
+https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
+*/
+#pragma once
+
+#include "scheme.h"
+
+#include <QtCore/QDateTime>
+#include <QtCore/QString>
+#include <QtCore/QByteArray>
+#include <vector>
+
+namespace Export {
+namespace Data {
+
+using Utf8String = QByteArray;
+
+Utf8String ParseString(const MTPstring &data);
+
+template <typename Type>
+inline auto NumberToString(Type value)
+-> std::enable_if_t<std::is_arithmetic_v<Type>, Utf8String> {
+	const auto result = std::to_string(value);
+	return QByteArray(result.data(), int(result.size()));
+}
+
+struct PersonalInfo {
+	Utf8String firstName;
+	Utf8String lastName;
+	Utf8String phoneNumber;
+	Utf8String username;
+	Utf8String bio;
+};
+
+PersonalInfo ParsePersonalInfo(const MTPUserFull &data);
+
+struct UserpicsInfo {
+	int count = 0;
+};
+
+struct File {
+	QString relativePath;
+};
+
+struct Userpic {
+	uint64 id = 0;
+	QDateTime date;
+	File image;
+};
+
+struct UserpicsSlice {
+	std::vector<Userpic> list;
+};
+
+UserpicsSlice ParseUserpicsSlice(const MTPVector<MTPPhoto> &data);
+
+struct Contact {
+	Utf8String firstName;
+	Utf8String lastName;
+	Utf8String phoneNumber;
+};
+
+struct ContactsList {
+	std::vector<Contact> list;
+};
+
+struct Session {
+	Utf8String platform;
+	Utf8String deviceModel;
+	Utf8String systemVersion;
+	Utf8String applicationName;
+	Utf8String applicationVersion;
+	QDateTime created;
+	QDateTime lastActive;
+	Utf8String ip;
+	Utf8String country;
+	Utf8String region;
+};
+
+struct SessionsList {
+	std::vector<Session> list;
+};
+
+struct ChatsInfo {
+	int count = 0;
+};
+
+struct ChatInfo {
+	enum class Type {
+		Personal,
+		Group,
+		Channel,
+	};
+	Type type = Type::Personal;
+	QString name;
+};
+
+struct Message {
+	int id = 0;
+};
+
+struct MessagesSlice {
+	std::vector<Message> list;
+};
+
+Utf8String FormatPhoneNumber(const Utf8String &phoneNumber);
+
+} // namespace Data
+} // namespace Export