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Telegram/SourceFiles/info/channel_statistics/earn/earn_format.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 "info/channel_statistics/earn/earn_format.h"
+
+#include <QtCore/QLocale>
+
+namespace Info::ChannelEarn {
+namespace {
+
+constexpr auto kMinorPartLength = 9;
+constexpr auto kMaxChoppedZero = kMinorPartLength - 2;
+constexpr auto kZero = QChar('0');
+const auto DecimalPoint = QString() + QLocale().decimalPoint();
+
+using EarnInt = Data::EarnInt;
+
+} // namespace
+
+QString MajorPart(EarnInt value) {
+	const auto string = QString::number(value);
+	const auto diff = int(string.size()) - kMinorPartLength;
+	return (diff <= 0) ? QString(kZero) : string.mid(0, diff);
+}
+
+QString MajorPart(CreditsAmount value) {
+	return QString::number(int64(value.value()));
+}
+
+QString MinorPart(EarnInt value) {
+	if (!value) {
+		return DecimalPoint + kZero + kZero;
+	}
+	const auto string = QString::number(value);
+	const auto diff = int(string.size()) - kMinorPartLength;
+	const auto result = (diff < 0)
+		? DecimalPoint + u"%1"_q.arg(0, std::abs(diff), 10, kZero) + string
+		: DecimalPoint + string.mid(diff);
+	const auto begin = (result.constData());
+	const auto end = (begin + result.size());
+	auto ch = end - 1;
+	auto zeroCount = 0;
+	while (ch != begin) {
+		if (((*ch) == kZero) && (zeroCount < kMaxChoppedZero)) {
+			zeroCount++;
+		} else {
+			break;
+		}
+		ch--;
+	}
+	return result.chopped(zeroCount);
+}
+
+QString MinorPart(CreditsAmount value) {
+	static const int DecimalPointLength = DecimalPoint.length();
+
+	const auto fractional = std::abs(int(value.value() * 100)) % 100;
+	auto result = QString(DecimalPointLength + 2, Qt::Uninitialized);
+
+	for (int i = 0; i < DecimalPointLength; ++i) {
+		result[i] = DecimalPoint[i];
+	}
+
+	result[DecimalPointLength] = QChar('0' + fractional / 10);
+	result[DecimalPointLength + 1] = QChar('0' + fractional % 10);
+
+	return result;
+}
+
+QString ToUsd(
+		Data::EarnInt value,
+		float64 rate,
+		int afterFloat) {
+	return ToUsd(CreditsAmount(value), rate, afterFloat);
+}
+
+QString ToUsd(
+		CreditsAmount value,
+		float64 rate,
+		int afterFloat) {
+	constexpr auto kApproximately = QChar(0x2248);
+
+	return QString(kApproximately)
+		+ QChar('$')
+		+ QLocale().toString(
+			value.value() * rate,
+			'f',
+			afterFloat ? afterFloat : 2);
+}
+
+} // namespace Info::ChannelEarn