Add an overload of QStringView::count() for QLatin1String

Required for the API symmetry between QStringView and QLatin1String.

[ChangeLog][QtCore][QStringView] Added an overload of
QStringView::count() for QLatin1String.

Change-Id: Ic49a4b31e8f6f0969eff0f792654d23a60e06c49
Task-numer: QTBUG-98431
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>

src/corelib/text/qstring.cpp

@@ -10441,6 +10441,17 @@ qsizetype QtPrivate::count(QLatin1String haystack, QStringView needle, Qt::CaseS
     return num;
 }
 
+qsizetype QtPrivate::count(QStringView haystack, QLatin1String needle, Qt::CaseSensitivity cs)
+{
+    if (haystack.size() < needle.size())
+        return -1;
+
+    QVarLengthArray<char16_t> s(needle.size());
+    qt_from_latin1(s.data(), needle.latin1(), size_t(needle.size()));
+
+    return QtPrivate::count(haystack, QStringView(s.data(), s.size()), cs);
+}
+
 qsizetype QtPrivate::count(QLatin1String haystack, QChar needle, Qt::CaseSensitivity cs) noexcept
 {
     // non-L1 needles cannot possibly match in L1-only haystacks

src/corelib/text/qstring.h

@@ -396,6 +396,9 @@ qsizetype QStringView::lastIndexOf(QLatin1String s, Qt::CaseSensitivity cs) cons
 { return QtPrivate::lastIndexOf(*this, size(), s, cs); }
 qsizetype QStringView::lastIndexOf(QLatin1String s, qsizetype from, Qt::CaseSensitivity cs) const noexcept
 { return QtPrivate::lastIndexOf(*this, from, s, cs); }
+qsizetype QStringView::count(QLatin1String s, Qt::CaseSensitivity cs) const
+{ return QtPrivate::count(*this, s, cs); }
+
 
 //
 // QAnyStringView members that require QLatin1String

src/corelib/text/qstringalgorithms.h

@@ -123,6 +123,7 @@ namespace QtPrivate {
 
 [[nodiscard]] Q_CORE_EXPORT Q_DECL_PURE_FUNCTION qsizetype count(QStringView haystack, QChar needle, Qt::CaseSensitivity cs = Qt::CaseSensitive) noexcept;
 [[nodiscard]] Q_CORE_EXPORT Q_DECL_PURE_FUNCTION qsizetype count(QStringView haystack, QStringView needle, Qt::CaseSensitivity cs = Qt::CaseSensitive) noexcept;
+[[nodiscard]] Q_CORE_EXPORT Q_DECL_PURE_FUNCTION qsizetype count(QStringView haystack, QLatin1String needle, Qt::CaseSensitivity cs = Qt::CaseSensitive);
 [[nodiscard]] Q_CORE_EXPORT Q_DECL_PURE_FUNCTION qsizetype count(QLatin1String haystack, QLatin1String needle, Qt::CaseSensitivity cs = Qt::CaseSensitive);
 [[nodiscard]] Q_CORE_EXPORT Q_DECL_PURE_FUNCTION qsizetype count(QLatin1String haystack, QStringView needle, Qt::CaseSensitivity cs = Qt::CaseSensitive);
 [[nodiscard]] Q_CORE_EXPORT Q_DECL_PURE_FUNCTION qsizetype count(QLatin1String haystack, QChar needle, Qt::CaseSensitivity cs = Qt::CaseSensitive) noexcept;

src/corelib/text/qstringview.cpp

@@ -1152,6 +1152,21 @@ QT_BEGIN_NAMESPACE
     \sa QString::count(), contains(), indexOf()
 */
 
+/*!
+    \fn qsizetype QStringView::count(QLatin1String l1, Qt::CaseSensitivity cs) const noexcept
+
+    \since 6.4
+    \overload count()
+
+    Returns the number of (potentially overlapping) occurrences of the
+    Latin-1 string \a l1 in this string view.
+
+    If \a cs is Qt::CaseSensitive (default), the search is
+    case sensitive; otherwise the search is case insensitive.
+
+    \sa QString::count(), contains(), indexOf()
+*/
+
 /*!
   \fn qint64 QStringView::toLongLong(bool *ok, int base) const
 

src/corelib/text/qstringview.h

@@ -341,6 +341,7 @@ public:
     { return QtPrivate::count(*this, c, cs); }
     [[nodiscard]] qsizetype count(QStringView s, Qt::CaseSensitivity cs = Qt::CaseSensitive) const noexcept
     { return QtPrivate::count(*this, s, cs); }
+    [[nodiscard]] inline qsizetype count(QLatin1String s, Qt::CaseSensitivity cs = Qt::CaseSensitive) const;
 
     [[nodiscard]] qsizetype lastIndexOf(QChar c, Qt::CaseSensitivity cs = Qt::CaseSensitive) const noexcept
     { return lastIndexOf(c, -1, cs); }

tests/auto/corelib/text/qstringapisymmetry/tst_qstringapisymmetry.cpp

@@ -738,9 +738,8 @@ private Q_SLOTS:
 
     void count_QStringView_QString_data() { count_data(); }
     void count_QStringView_QString() { count_impl<QStringView, QString>(); }
-    // TODO: enable when QStringView::count(QLatin1String, ...) is implemented
+    void count_QStringView_QLatin1String_data() { count_data(); }
-    // void count_QStringView_QLatin1String_data() { count_data(); }
+    void count_QStringView_QLatin1String() { count_impl<QStringView, QLatin1String>(); }
-    // void count_QStringView_QLatin1String() { count_impl<QStringView, QLatin1String>(); }
     void count_QStringView_QStringView_data() { count_data(); }
     void count_QStringView_QStringView() { count_impl<QStringView, QStringView>(); }
     void count_QStringView_QChar_data() { count_data(); }