317 lines
14 KiB
C++
317 lines
14 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2017 Klarälvdalens Datakonsult AB, a KDAB Group company, info@kdab.com, author Marc Mutz <marc.mutz@kdab.com>
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** Contact: http://www.qt.io/licensing/
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**
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** This file is part of the QtCore module of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:LGPL$
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** Commercial License Usage
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** Licensees holding valid commercial Qt licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and The Qt Company. For licensing terms
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** and conditions see https://www.qt.io/terms-conditions. For further
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** information use the contact form at https://www.qt.io/contact-us.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 3 as published by the Free Software
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** Foundation and appearing in the file LICENSE.LGPL3 included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU Lesser General Public License version 3 requirements
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** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
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**
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** GNU General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU
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** General Public License version 2.0 or (at your option) the GNU General
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** Public license version 3 or any later version approved by the KDE Free
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** Qt Foundation. The licenses are as published by the Free Software
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** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
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** included in the packaging of this file. Please review the following
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** information to ensure the GNU General Public License requirements will
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** be met: https://www.gnu.org/licenses/gpl-2.0.html and
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** https://www.gnu.org/licenses/gpl-3.0.html.
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#ifndef QSTRINGVIEW_H
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#define QSTRINGVIEW_H
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#ifndef QT_STRINGVIEW_LEVEL
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# define QT_STRINGVIEW_LEVEL 1
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#endif
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#include <QtCore/qchar.h>
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#include <QtCore/qbytearray.h>
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#include <QtCore/qstringliteral.h>
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#include <QtCore/qstringalgorithms.h>
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#include <string>
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QT_BEGIN_NAMESPACE
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class QString;
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class QStringRef;
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namespace QtPrivate {
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template <typename Char>
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struct IsCompatibleCharTypeHelper
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: std::integral_constant<bool,
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std::is_same<Char, QChar>::value ||
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std::is_same<Char, ushort>::value ||
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#if defined(Q_COMPILER_UNICODE_STRINGS)
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std::is_same<Char, char16_t>::value ||
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#endif
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(std::is_same<Char, wchar_t>::value && sizeof(wchar_t) == sizeof(QChar))> {};
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template <typename Char>
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struct IsCompatibleCharType
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: IsCompatibleCharTypeHelper<typename std::remove_cv<typename std::remove_reference<Char>::type>::type> {};
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template <typename Array>
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struct IsCompatibleArrayHelper : std::false_type {};
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template <typename Char, size_t N>
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struct IsCompatibleArrayHelper<Char[N]>
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: IsCompatibleCharType<Char> {};
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template <typename Array>
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struct IsCompatibleArray
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: IsCompatibleArrayHelper<typename std::remove_cv<typename std::remove_reference<Array>::type>::type> {};
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template <typename Pointer>
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struct IsCompatiblePointerHelper : std::false_type {};
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template <typename Char>
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struct IsCompatiblePointerHelper<Char*>
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: IsCompatibleCharType<Char> {};
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template <typename Pointer>
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struct IsCompatiblePointer
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: IsCompatiblePointerHelper<typename std::remove_cv<typename std::remove_reference<Pointer>::type>::type> {};
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template <typename T>
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struct IsCompatibleStdBasicStringHelper : std::false_type {};
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template <typename Char, typename...Args>
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struct IsCompatibleStdBasicStringHelper<std::basic_string<Char, Args...> >
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: IsCompatibleCharType<Char> {};
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template <typename T>
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struct IsCompatibleStdBasicString
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: IsCompatibleStdBasicStringHelper<
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typename std::remove_cv<typename std::remove_reference<T>::type>::type
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> {};
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} // namespace QtPrivate
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class QStringView
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{
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public:
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#if defined(Q_OS_WIN) && !defined(Q_COMPILER_UNICODE_STRINGS)
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typedef wchar_t storage_type;
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#else
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typedef char16_t storage_type;
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#endif
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typedef const QChar value_type;
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typedef std::ptrdiff_t difference_type;
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typedef qsizetype size_type;
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typedef value_type &reference;
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typedef value_type &const_reference;
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typedef value_type *pointer;
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typedef value_type *const_pointer;
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typedef pointer iterator;
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typedef const_pointer const_iterator;
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typedef std::reverse_iterator<iterator> reverse_iterator;
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typedef std::reverse_iterator<const_iterator> const_reverse_iterator;
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private:
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template <typename Char>
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using if_compatible_char = typename std::enable_if<QtPrivate::IsCompatibleCharType<Char>::value, bool>::type;
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template <typename Array>
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using if_compatible_array = typename std::enable_if<QtPrivate::IsCompatibleArray<Array>::value, bool>::type;
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template <typename Pointer>
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using if_compatible_pointer = typename std::enable_if<QtPrivate::IsCompatiblePointer<Pointer>::value, bool>::type;
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template <typename T>
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using if_compatible_string = typename std::enable_if<QtPrivate::IsCompatibleStdBasicString<T>::value, bool>::type;
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template <typename T>
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using if_compatible_qstring_like = typename std::enable_if<std::is_same<T, QString>::value || std::is_same<T, QStringRef>::value, bool>::type;
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template <typename Char, size_t N>
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static Q_DECL_CONSTEXPR qsizetype lengthHelperArray(const Char (&)[N]) Q_DECL_NOTHROW
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{
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return qsizetype(N - 1);
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}
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template <typename Char>
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static qsizetype lengthHelperPointer(const Char *str) Q_DECL_NOTHROW
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{
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#if defined(Q_CC_GNU) && !defined(Q_CC_CLANG) && !defined(Q_CC_INTEL)
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if (__builtin_constant_p(*str)) {
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qsizetype result = 0;
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while (*str++)
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++result;
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return result;
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}
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#endif
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return QtPrivate::qustrlen(reinterpret_cast<const ushort *>(str));
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}
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static qsizetype lengthHelperPointer(const QChar *str) Q_DECL_NOTHROW
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{
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return QtPrivate::qustrlen(reinterpret_cast<const ushort *>(str));
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}
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template <typename Char>
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static const storage_type *castHelper(const Char *str) Q_DECL_NOTHROW
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{ return reinterpret_cast<const storage_type*>(str); }
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static Q_DECL_CONSTEXPR const storage_type *castHelper(const storage_type *str) Q_DECL_NOTHROW
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{ return str; }
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public:
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Q_DECL_CONSTEXPR QStringView() Q_DECL_NOTHROW
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: m_size(0), m_data(nullptr) {}
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Q_DECL_CONSTEXPR QStringView(std::nullptr_t) Q_DECL_NOTHROW
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: QStringView() {}
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template <typename Char, if_compatible_char<Char> = true>
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Q_DECL_CONSTEXPR QStringView(const Char *str, qsizetype len)
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: m_size((Q_ASSERT(len >= 0), Q_ASSERT(str || !len), len)),
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m_data(castHelper(str)) {}
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template <typename Char, if_compatible_char<Char> = true>
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Q_DECL_CONSTEXPR QStringView(const Char *f, const Char *l)
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: QStringView(f, l - f) {}
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#ifdef Q_CLANG_QDOC
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template <typename Char, size_t N>
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Q_DECL_CONSTEXPR QStringView(const Char (&array)[N]) Q_DECL_NOTHROW;
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template <typename Char>
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Q_DECL_CONSTEXPR QStringView(const Char *str) Q_DECL_NOTHROW;
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#else
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template <typename Array, if_compatible_array<Array> = true>
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Q_DECL_CONSTEXPR QStringView(const Array &str) Q_DECL_NOTHROW
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: QStringView(str, lengthHelperArray(str)) {}
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template <typename Pointer, if_compatible_pointer<Pointer> = true>
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Q_DECL_CONSTEXPR QStringView(const Pointer &str) Q_DECL_NOTHROW
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: QStringView(str, str ? lengthHelperPointer(str) : 0) {}
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#endif
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#ifdef Q_CLANG_QDOC
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QStringView(const QString &str) Q_DECL_NOTHROW;
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QStringView(const QStringRef &str) Q_DECL_NOTHROW;
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#else
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template <typename String, if_compatible_qstring_like<String> = true>
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QStringView(const String &str) Q_DECL_NOTHROW
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: QStringView(str.isNull() ? nullptr : str.data(), qsizetype(str.size())) {}
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#endif
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template <typename StdBasicString, if_compatible_string<StdBasicString> = true>
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QStringView(const StdBasicString &str) Q_DECL_NOTHROW
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: QStringView(str.data(), qsizetype(str.size())) {}
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Q_REQUIRED_RESULT inline QString toString() const; // defined in qstring.h
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Q_REQUIRED_RESULT Q_DECL_CONSTEXPR qsizetype size() const Q_DECL_NOTHROW { return m_size; }
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Q_REQUIRED_RESULT const_pointer data() const Q_DECL_NOTHROW { return reinterpret_cast<const_pointer>(m_data); }
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Q_REQUIRED_RESULT Q_DECL_CONSTEXPR const storage_type *utf16() const Q_DECL_NOTHROW { return m_data; }
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Q_REQUIRED_RESULT Q_DECL_CONSTEXPR QChar operator[](qsizetype n) const
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{ return Q_ASSERT(n >= 0), Q_ASSERT(n < size()), QChar(m_data[n]); }
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//
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// QString API
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//
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Q_REQUIRED_RESULT QByteArray toLatin1() const { return QtPrivate::convertToLatin1(*this); }
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Q_REQUIRED_RESULT QByteArray toUtf8() const { return QtPrivate::convertToUtf8(*this); }
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Q_REQUIRED_RESULT QByteArray toLocal8Bit() const { return QtPrivate::convertToLocal8Bit(*this); }
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Q_REQUIRED_RESULT inline QVector<uint> toUcs4() const; // defined in qvector.h
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Q_REQUIRED_RESULT Q_DECL_CONSTEXPR QChar at(qsizetype n) const { return (*this)[n]; }
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Q_REQUIRED_RESULT Q_DECL_CONSTEXPR QStringView mid(qsizetype pos) const
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{ return Q_ASSERT(pos >= 0), Q_ASSERT(pos <= size()), QStringView(m_data + pos, m_size - pos); }
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Q_REQUIRED_RESULT Q_DECL_CONSTEXPR QStringView mid(qsizetype pos, qsizetype n) const
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{ return Q_ASSERT(pos >= 0), Q_ASSERT(n >= 0), Q_ASSERT(pos + n <= size()), QStringView(m_data + pos, n); }
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Q_REQUIRED_RESULT Q_DECL_CONSTEXPR QStringView left(qsizetype n) const
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{ return Q_ASSERT(n >= 0), Q_ASSERT(n <= size()), QStringView(m_data, n); }
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Q_REQUIRED_RESULT Q_DECL_CONSTEXPR QStringView right(qsizetype n) const
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{ return Q_ASSERT(n >= 0), Q_ASSERT(n <= size()), QStringView(m_data + m_size - n, n); }
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Q_REQUIRED_RESULT Q_DECL_CONSTEXPR QStringView chopped(qsizetype n) const
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{ return Q_ASSERT(n >= 0), Q_ASSERT(n <= size()), QStringView(m_data, m_size - n); }
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Q_DECL_RELAXED_CONSTEXPR void truncate(qsizetype n)
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{ Q_ASSERT(n >= 0); Q_ASSERT(n <= size()); m_size = n; }
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Q_DECL_RELAXED_CONSTEXPR void chop(qsizetype n)
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{ Q_ASSERT(n >= 0); Q_ASSERT(n <= size()); m_size -= n; }
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Q_REQUIRED_RESULT QStringView trimmed() const Q_DECL_NOTHROW { return QtPrivate::trimmed(*this); }
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Q_REQUIRED_RESULT int compare(QStringView other, Qt::CaseSensitivity cs = Qt::CaseSensitive) const Q_DECL_NOTHROW
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{ return QtPrivate::compareStrings(*this, other, cs); }
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Q_REQUIRED_RESULT bool startsWith(QStringView s, Qt::CaseSensitivity cs = Qt::CaseSensitive) const Q_DECL_NOTHROW
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{ return QtPrivate::startsWith(*this, s, cs); }
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Q_REQUIRED_RESULT inline bool startsWith(QLatin1String s, Qt::CaseSensitivity cs = Qt::CaseSensitive) const Q_DECL_NOTHROW;
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Q_REQUIRED_RESULT bool startsWith(QChar c) const Q_DECL_NOTHROW
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{ return !empty() && front() == c; }
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Q_REQUIRED_RESULT bool startsWith(QChar c, Qt::CaseSensitivity cs) const Q_DECL_NOTHROW
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{ return QtPrivate::startsWith(*this, QStringView(&c, 1), cs); }
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Q_REQUIRED_RESULT bool endsWith(QStringView s, Qt::CaseSensitivity cs = Qt::CaseSensitive) const Q_DECL_NOTHROW
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{ return QtPrivate::endsWith(*this, s, cs); }
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Q_REQUIRED_RESULT inline bool endsWith(QLatin1String s, Qt::CaseSensitivity cs = Qt::CaseSensitive) const Q_DECL_NOTHROW;
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Q_REQUIRED_RESULT bool endsWith(QChar c) const Q_DECL_NOTHROW
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{ return !empty() && back() == c; }
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Q_REQUIRED_RESULT bool endsWith(QChar c, Qt::CaseSensitivity cs) const Q_DECL_NOTHROW
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{ return QtPrivate::endsWith(*this, QStringView(&c, 1), cs); }
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Q_REQUIRED_RESULT bool isRightToLeft() const Q_DECL_NOTHROW
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{ return QtPrivate::isRightToLeft(*this); }
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Q_REQUIRED_RESULT Q_CORE_EXPORT int toWCharArray(wchar_t *array) const;
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//
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// STL compatibility API:
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//
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Q_REQUIRED_RESULT const_iterator begin() const Q_DECL_NOTHROW { return data(); }
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Q_REQUIRED_RESULT const_iterator end() const Q_DECL_NOTHROW { return data() + size(); }
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Q_REQUIRED_RESULT const_iterator cbegin() const Q_DECL_NOTHROW { return begin(); }
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Q_REQUIRED_RESULT const_iterator cend() const Q_DECL_NOTHROW { return end(); }
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Q_REQUIRED_RESULT const_reverse_iterator rbegin() const Q_DECL_NOTHROW { return const_reverse_iterator(end()); }
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Q_REQUIRED_RESULT const_reverse_iterator rend() const Q_DECL_NOTHROW { return const_reverse_iterator(begin()); }
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Q_REQUIRED_RESULT const_reverse_iterator crbegin() const Q_DECL_NOTHROW { return rbegin(); }
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Q_REQUIRED_RESULT const_reverse_iterator crend() const Q_DECL_NOTHROW { return rend(); }
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Q_REQUIRED_RESULT Q_DECL_CONSTEXPR bool empty() const Q_DECL_NOTHROW { return size() == 0; }
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Q_REQUIRED_RESULT Q_DECL_CONSTEXPR QChar front() const { return Q_ASSERT(!empty()), QChar(m_data[0]); }
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Q_REQUIRED_RESULT Q_DECL_CONSTEXPR QChar back() const { return Q_ASSERT(!empty()), QChar(m_data[m_size - 1]); }
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//
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// Qt compatibility API:
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//
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Q_REQUIRED_RESULT Q_DECL_CONSTEXPR bool isNull() const Q_DECL_NOTHROW { return !m_data; }
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Q_REQUIRED_RESULT Q_DECL_CONSTEXPR bool isEmpty() const Q_DECL_NOTHROW { return empty(); }
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Q_REQUIRED_RESULT Q_DECL_CONSTEXPR int length() const /* not nothrow! */
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{ return Q_ASSERT(int(size()) == size()), int(size()); }
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Q_REQUIRED_RESULT Q_DECL_CONSTEXPR QChar first() const { return front(); }
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Q_REQUIRED_RESULT Q_DECL_CONSTEXPR QChar last() const { return back(); }
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private:
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qsizetype m_size;
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const storage_type *m_data;
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};
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Q_DECLARE_TYPEINFO(QStringView, Q_PRIMITIVE_TYPE);
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template <typename QStringLike, typename std::enable_if<
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std::is_same<QStringLike, QString>::value || std::is_same<QStringLike, QStringRef>::value,
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bool>::type = true>
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inline QStringView qToStringViewIgnoringNull(const QStringLike &s) Q_DECL_NOTHROW
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{ return QStringView(s.data(), s.size()); }
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QT_END_NAMESPACE
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#endif /* QSTRINGVIEW_H */
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