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https://github.com/LadybirdBrowser/ladybird.git
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e6f907a155
Problem: - Many constructors are defined as `{}` rather than using the ` = default` compiler-provided constructor. - Some types provide an implicit conversion operator from `nullptr_t` instead of requiring the caller to default construct. This violates the C++ Core Guidelines suggestion to declare single-argument constructors explicit (https://isocpp.github.io/CppCoreGuidelines/CppCoreGuidelines#c46-by-default-declare-single-argument-constructors-explicit). Solution: - Change default constructors to use the compiler-provided default constructor. - Remove implicit conversion operators from `nullptr_t` and change usage to enforce type consistency without conversion.
141 lines
4 KiB
C++
141 lines
4 KiB
C++
/*
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* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include <AK/Assertions.h>
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#include <AK/Checked.h>
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#include <AK/Types.h>
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namespace AK {
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class Utf32View;
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class Utf32CodepointIterator {
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friend class Utf32View;
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public:
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Utf32CodepointIterator() = default;
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~Utf32CodepointIterator() = default;
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bool operator==(const Utf32CodepointIterator& other) const
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{
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return m_ptr == other.m_ptr && m_length == other.m_length;
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}
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bool operator!=(const Utf32CodepointIterator& other) const
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{
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return !(*this == other);
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}
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Utf32CodepointIterator& operator++()
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{
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ASSERT(m_length > 0);
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m_ptr++;
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m_length--;
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return *this;
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}
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ssize_t operator-(const Utf32CodepointIterator& other) const
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{
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return m_ptr - other.m_ptr;
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}
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u32 operator*() const
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{
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ASSERT(m_length > 0);
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return *m_ptr;
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}
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constexpr int code_point_length_in_bytes() const { return sizeof(u32); }
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bool done() const { return !m_length; }
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private:
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Utf32CodepointIterator(const u32* ptr, size_t length)
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: m_ptr(ptr)
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, m_length((ssize_t)length)
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{
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}
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const u32* m_ptr { nullptr };
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ssize_t m_length { -1 };
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};
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class Utf32View {
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public:
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using Iterator = Utf32CodepointIterator;
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Utf32View() = default;
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Utf32View(const u32* code_points, size_t length)
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: m_code_points(code_points)
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, m_length(length)
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{
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ASSERT(code_points || length == 0);
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}
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Utf32CodepointIterator begin() const
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{
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return { begin_ptr(), m_length };
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}
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Utf32CodepointIterator end() const
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{
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return { end_ptr(), 0 };
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}
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const u32* code_points() const { return m_code_points; }
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bool is_empty() const { return m_length == 0; }
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size_t length() const { return m_length; }
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size_t iterator_offset(const Utf32CodepointIterator& it) const
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{
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ASSERT(it.m_ptr >= m_code_points);
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ASSERT(it.m_ptr < m_code_points + m_length);
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return ((ptrdiff_t)it.m_ptr - (ptrdiff_t)m_code_points) / sizeof(u32);
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}
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Utf32View substring_view(size_t offset, size_t length) const
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{
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if (length == 0)
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return {};
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ASSERT(offset < m_length);
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ASSERT(!Checked<size_t>::addition_would_overflow(offset, length));
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ASSERT((offset + length) <= m_length);
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return Utf32View(m_code_points + offset, length);
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}
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private:
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const u32* begin_ptr() const
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{
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return m_code_points;
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}
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const u32* end_ptr() const
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{
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return m_code_points + m_length;
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}
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const u32* m_code_points { nullptr };
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size_t m_length { 0 };
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};
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}
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using AK::Utf32View;
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