qcollator_win.cpp

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// Copyright (C) 2020 Aleix Pol Gonzalez <aleixpol@kde.org>
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
#include "qcollator_p.h"
#include "qlocale_p.h"
#include "qstringlist.h"
#include "qstring.h"
 
#include <QDebug>
 
#include <qt_windows.h>
#include <qsysinfo.h>
 
QT_BEGIN_NAMESPACE
 
//NOTE: SORT_DIGITSASNUMBERS is available since win7
#ifndef SORT_DIGITSASNUMBERS
#define SORT_DIGITSASNUMBERS 8
#endif
 
// implemented in qlocale_win.cpp
extern LCID qt_inIsoNametoLCID(const char *name);
 
void QCollatorPrivate::init()
{
    collator = 0;
    if (isC())
        return;
 
    localeID = qt_inIsoNametoLCID(QLocalePrivate::get(locale)->bcp47Name().constData());
 
    if (caseSensitivity == Qt::CaseInsensitive)
        collator |= NORM_IGNORECASE;
 
    // WINE does not support SORT_DIGITSASNUMBERS :-(
    // (and its std::sort() crashes on bad comparisons, QTBUG-74209)
    if (numericMode)
        collator |= SORT_DIGITSASNUMBERS;
 
    if (ignorePunctuation)
        collator |= NORM_IGNORESYMBOLS;
 
    dirty = false;
}
 
void QCollatorPrivate::cleanup()
{
}
 
int QCollator::compare(QStringView s1, QStringView s2) const
{
    if (!s1.size())
        return s2.size() ? -1 : 0;
    if (!s2.size())
        return +1;
 
    if (d->isC())
        return s1.compare(s2, d->caseSensitivity);
 
    d->ensureInitialized();
 
    //* from Windows documentation *
    // Returns one of the following values if successful. To maintain the C
    // runtime convention of comparing strings, the value 2 can be subtracted
    // from a nonzero return value. Then, the meaning of <0, ==0, and >0 is
    // consistent with the C runtime.
    // [...] The function returns 0 if it does not succeed.
    // https://docs.microsoft.com/en-us/windows/desktop/api/stringapiset/nf-stringapiset-comparestringex#return-value
 
    const int ret = CompareString(d->localeID, d->collator,
                                  reinterpret_cast<const wchar_t *>(s1.data()), s1.size(),
                                  reinterpret_cast<const wchar_t *>(s2.data()), s2.size());
    if (Q_LIKELY(ret))
        return ret - 2;
 
    switch (DWORD error = GetLastError()) {
    case ERROR_INVALID_FLAGS:
        qWarning("Unsupported flags (%d) used in QCollator", int(d->collator));
        break;
    case ERROR_INVALID_PARAMETER:
        qWarning("Invalid parameter for QCollator::compare()");
        break;
    default:
        qWarning("Failed (%ld) comparison in QCollator::compare()", long(error));
        break;
    }
    // We have no idea what to return, so pretend we think they're equal.
    // At least that way we'll be consistent if we get the same values swapped ...
    return 0;
}
 
QCollatorSortKey QCollator::sortKey(const QString &string) const
{
    d->ensureInitialized();
 
    if (d->isC())
        return QCollatorSortKey(new QCollatorSortKeyPrivate(string));
 
    // truncating sizes (QTBUG-105038)
    int size = LCMapStringW(d->localeID, LCMAP_SORTKEY | d->collator,
                           reinterpret_cast<const wchar_t*>(string.constData()), string.size(),
                           0, 0);
 
    QString ret(size, Qt::Uninitialized);
    int finalSize = LCMapStringW(d->localeID, LCMAP_SORTKEY | d->collator,
                           reinterpret_cast<const wchar_t*>(string.constData()), string.size(),
                           reinterpret_cast<wchar_t*>(ret.data()), ret.size());
    if (finalSize == 0) {
        qWarning()
            << "there were problems when generating the ::sortKey by LCMapStringW with error:"
            << GetLastError();
    }
    return QCollatorSortKey(new QCollatorSortKeyPrivate(std::move(ret)));
}
 
int QCollatorSortKey::compare(const QCollatorSortKey &otherKey) const
{
    return d->m_key.compare(otherKey.d->m_key);
}
 
QT_END_NAMESPACE