diff options
author | Lars Knoll <lars.knoll@qt.io> | 2019-08-06 12:24:37 +0200 |
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committer | Lars Knoll <lars.knoll@qt.io> | 2019-08-07 12:50:28 +0200 |
commit | 05b90be3c5ce4709156178478abb2e7ba125a0be (patch) | |
tree | a7c39b76c99f4887dbc6837be3a41afc7fdb29b4 /src/corelib/text/qstringiterator_p.h | |
parent | 7301e44161d8bb25410219a31405584c9492b83e (diff) | |
parent | 6f357f50b4b72e3c5a6903a09624ade1d72d12c1 (diff) |
Merge "Merge remote-tracking branch 'origin/dev' into wip/qt6"
Diffstat (limited to 'src/corelib/text/qstringiterator_p.h')
-rw-r--r-- | src/corelib/text/qstringiterator_p.h | 255 |
1 files changed, 255 insertions, 0 deletions
diff --git a/src/corelib/text/qstringiterator_p.h b/src/corelib/text/qstringiterator_p.h new file mode 100644 index 0000000000..219589b6e4 --- /dev/null +++ b/src/corelib/text/qstringiterator_p.h @@ -0,0 +1,255 @@ +/**************************************************************************** +** +** 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 |