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+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Copyright (C) 2014 Klarälvdalens Datakonsult AB, a KDAB Group company, info@kdab.com, author Giuseppe D'Angelo <giuseppe.dangelo@kdab.com>
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the QtCore module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QSTRINGITERATOR_H
+#define QSTRINGITERATOR_H
+
+//
+// W A R N I N G
+// -------------
+//
+// This file is not part of the Qt API. It exists purely as an
+// implementation detail. This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include <QtCore/private/qglobal_p.h>
+#include <QtCore/qstring.h>
+
+QT_BEGIN_NAMESPACE
+
+class QStringIterator
+{
+ QString::const_iterator i, pos, e;
+ Q_STATIC_ASSERT((std::is_same<QString::const_iterator, const QChar *>::value));
+public:
+ explicit QStringIterator(QStringView string, qsizetype idx = 0)
+ : i(string.begin()),
+ pos(i + idx),
+ e(string.end())
+ {
+ }
+
+ inline explicit QStringIterator(const QChar *begin, const QChar *end)
+ : i(begin),
+ pos(begin),
+ e(end)
+ {
+ }
+
+ inline explicit QStringIterator(const QChar *begin, int idx, const QChar *end)
+ : i(begin),
+ pos(begin + idx),
+ e(end)
+ {
+ }
+
+ inline QString::const_iterator position() const
+ {
+ return pos;
+ }
+
+ inline int index() const
+ {
+ return pos - i;
+ }
+
+ inline void setPosition(QString::const_iterator position)
+ {
+ Q_ASSERT_X(i <= position && position <= e, Q_FUNC_INFO, "position out of bounds");
+ pos = position;
+ }
+
+ // forward iteration
+
+ inline bool hasNext() const
+ {
+ return pos < e;
+ }
+
+ inline void advance()
+ {
+ Q_ASSERT_X(hasNext(), Q_FUNC_INFO, "iterator hasn't a next item");
+
+ if (Q_UNLIKELY((pos++)->isHighSurrogate())) {
+ if (Q_LIKELY(pos != e && pos->isLowSurrogate()))
+ ++pos;
+ }
+ }
+
+ inline void advanceUnchecked()
+ {
+ Q_ASSERT_X(hasNext(), Q_FUNC_INFO, "iterator hasn't a next item");
+
+ if (Q_UNLIKELY((pos++)->isHighSurrogate()))
+ ++pos;
+ }
+
+ inline uint peekNextUnchecked() const
+ {
+ Q_ASSERT_X(hasNext(), Q_FUNC_INFO, "iterator hasn't a next item");
+
+ if (Q_UNLIKELY(pos->isHighSurrogate()))
+ return QChar::surrogateToUcs4(pos[0], pos[1]);
+
+ return pos->unicode();
+ }
+
+ inline uint peekNext(uint invalidAs = QChar::ReplacementCharacter) const
+ {
+ Q_ASSERT_X(hasNext(), Q_FUNC_INFO, "iterator hasn't a next item");
+
+ if (Q_UNLIKELY(pos->isSurrogate())) {
+ if (Q_LIKELY(pos->isHighSurrogate())) {
+ const QChar *low = pos + 1;
+ if (Q_LIKELY(low != e && low->isLowSurrogate()))
+ return QChar::surrogateToUcs4(*pos, *low);
+ }
+ return invalidAs;
+ }
+
+ return pos->unicode();
+ }
+
+ inline uint nextUnchecked()
+ {
+ Q_ASSERT_X(hasNext(), Q_FUNC_INFO, "iterator hasn't a next item");
+
+ const QChar cur = *pos++;
+ if (Q_UNLIKELY(cur.isHighSurrogate()))
+ return QChar::surrogateToUcs4(cur, *pos++);
+ return cur.unicode();
+ }
+
+ inline uint next(uint invalidAs = QChar::ReplacementCharacter)
+ {
+ Q_ASSERT_X(hasNext(), Q_FUNC_INFO, "iterator hasn't a next item");
+
+ const QChar uc = *pos++;
+ if (Q_UNLIKELY(uc.isSurrogate())) {
+ if (Q_LIKELY(uc.isHighSurrogate() && pos < e && pos->isLowSurrogate()))
+ return QChar::surrogateToUcs4(uc, *pos++);
+ return invalidAs;
+ }
+
+ return uc.unicode();
+ }
+
+ // backwards iteration
+
+ inline bool hasPrevious() const
+ {
+ return pos > i;
+ }
+
+ inline void recede()
+ {
+ Q_ASSERT_X(hasPrevious(), Q_FUNC_INFO, "iterator hasn't a previous item");
+
+ if (Q_UNLIKELY((--pos)->isLowSurrogate())) {
+ const QChar *high = pos - 1;
+ if (Q_LIKELY(high != i - 1 && high->isHighSurrogate()))
+ --pos;
+ }
+ }
+
+ inline void recedeUnchecked()
+ {
+ Q_ASSERT_X(hasPrevious(), Q_FUNC_INFO, "iterator hasn't a previous item");
+
+ if (Q_UNLIKELY((--pos)->isLowSurrogate()))
+ --pos;
+ }
+
+ inline uint peekPreviousUnchecked() const
+ {
+ Q_ASSERT_X(hasPrevious(), Q_FUNC_INFO, "iterator hasn't a previous item");
+
+ if (Q_UNLIKELY(pos[-1].isLowSurrogate()))
+ return QChar::surrogateToUcs4(pos[-2], pos[-1]);
+ return pos[-1].unicode();
+ }
+
+ inline uint peekPrevious(uint invalidAs = QChar::ReplacementCharacter) const
+ {
+ Q_ASSERT_X(hasPrevious(), Q_FUNC_INFO, "iterator hasn't a previous item");
+
+ if (Q_UNLIKELY(pos[-1].isSurrogate())) {
+ if (Q_LIKELY(pos[-1].isLowSurrogate())) {
+ const QChar *high = pos - 2;
+ if (Q_LIKELY(high != i - 1 && high->isHighSurrogate()))
+ return QChar::surrogateToUcs4(*high, pos[-1]);
+ }
+ return invalidAs;
+ }
+
+ return pos[-1].unicode();
+ }
+
+ inline uint previousUnchecked()
+ {
+ Q_ASSERT_X(hasPrevious(), Q_FUNC_INFO, "iterator hasn't a previous item");
+
+ const QChar cur = *--pos;
+ if (Q_UNLIKELY(cur.isLowSurrogate()))
+ return QChar::surrogateToUcs4(*--pos, cur);
+ return cur.unicode();
+ }
+
+ inline uint previous(uint invalidAs = QChar::ReplacementCharacter)
+ {
+ Q_ASSERT_X(hasPrevious(), Q_FUNC_INFO, "iterator hasn't a previous item");
+
+ const QChar uc = *--pos;
+ if (Q_UNLIKELY(uc.isSurrogate())) {
+ if (Q_LIKELY(uc.isLowSurrogate() && pos > i && pos[-1].isHighSurrogate()))
+ return QChar::surrogateToUcs4(*--pos, uc);
+ return invalidAs;
+ }
+
+ return uc.unicode();
+ }
+};
+
+QT_END_NAMESPACE
+
+#endif // QSTRINGITERATOR_H
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