dutil.h

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// SPDX-FileCopyrightText: 2016 - 2023 UnionTech Software Technology Co., Ltd.
//
// SPDX-License-Identifier: LGPL-3.0-or-later
 
#pragma once
 
#include <QTimer>
#include <QThread>
#include <QMetaObject>
#include <QCoreApplication>
#include <QRegularExpression>
#include <QStandardPaths>
#include <QDir>
#include <type_traits>
#include <cstring>
 
namespace DUtil
{
 
template <typename Func1>
inline void TimerSingleShot(int msec,  Func1 slot)
{
#if QT_VERSION >= 0x050500
    QTimer::singleShot(msec, slot);
#else
    QTimer *timer = new QTimer;
    timer->setSingleShot(true);
    timer->setInterval(msec);
    timer->moveToThread(qApp->thread());
    QObject::connect(timer, &QTimer::timeout, slot);
    QObject::connect(timer, &QTimer::timeout, timer, &QTimer::deleteLater);
    if (QThread::currentThread() == qApp->thread()) { timer->start(); }
    else { QMetaObject::invokeMethod(timer, "start", Qt::QueuedConnection); }
#endif
}
 
template <class T>
void SecureErase(T *p, size_t size)
{
    static_assert(std::is_standard_layout<T>::value && std::is_trivially_destructible<T>::value,
                  "try to erase content of raw pointer, but type T isn't suitable");
 
    std::memset(p, 0, size);
}
 
template <class T>
void SecureErase(T &obj)
{
    static_assert(std::is_default_constructible<typename T::value_type>::value,
                  "container's value type must have a default constructor.");
 
    for (typename T::iterator i = obj.begin(); i != obj.end(); ++i) {
        *i = typename T::value_type{};
    }
}
 
inline QString escapeToObjectPath(const QString &str)
{
    if (str.isEmpty()) {
        return "_";
    }
 
    auto ret = str;
    QRegularExpression re{R"([^a-zA-Z0-9])"};
    auto matcher = re.globalMatch(ret);
    while (matcher.hasNext()) {
        auto replaceList = matcher.next().capturedTexts();
        replaceList.removeDuplicates();
        for (const auto &c : replaceList) {
            auto hexStr = QString::number(static_cast<uint>(c.front().toLatin1()), 16);
            ret.replace(c, QString{R"(_%1)"}.arg(hexStr));
        }
    }
    return ret;
}
 
inline QString unescapeFromObjectPath(const QString &str)
{
    auto ret = str;
    for (int i = 0; i < str.size(); ++i) {
        if (str[i] == '_' && i + 2 < str.size()) {
            auto hexStr = str.mid(i + 1, 2);
            ret.replace(QString{"_%1"}.arg(hexStr), QChar::fromLatin1(hexStr.toUInt(nullptr, 16)));
            i += 2;
        }
    }
    return ret;
}
 
inline QString getAppIdFromAbsolutePath(const QString &path)
{
    static QString desktopSuffix{u8".desktop"};
    const auto &appDirs = QStandardPaths::standardLocations(QStandardPaths::ApplicationsLocation);
    if (!path.endsWith(desktopSuffix) ||
        !std::any_of(appDirs.cbegin(), appDirs.constEnd(), [&path](const QString &dir) { return path.startsWith(dir); })) {
        return {};
    }
 
    auto tmp = path.chopped(desktopSuffix.size());
    auto components = tmp.split(QDir::separator(), Qt::SkipEmptyParts);
    auto location = std::find(components.cbegin(), components.cend(), "applications");
    if (location == components.cend()) {
        return {};
    }
 
    auto appId = QStringList{location + 1, components.cend()}.join('-');
    return appId;
}
 
inline QStringList getAbsolutePathFromAppId(const QString &appId)
{
    auto components = appId.split('-', Qt::SkipEmptyParts);
    auto appDirs = QStandardPaths::standardLocations(QStandardPaths::ApplicationsLocation);
 
    QStringList ret;
    for (const auto &dirPath : appDirs) {
        auto currentDir = dirPath;
        for (auto it = components.cbegin(); it != components.cend(); ++it) {
            auto currentName = QStringList{it, components.cend()}.join('-') + QString{".desktop"};
            QDir dir{currentDir};
            if (dir.exists(currentName)) {
                ret.append(dir.filePath(currentName));
            }
 
            currentDir.append(QDir::separator() + *it);
        }
    }
 
    return ret;
}
}