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5d180d1f99
(...and ASSERT_NOT_REACHED => VERIFY_NOT_REACHED) Since all of these checks are done in release builds as well, let's rename them to VERIFY to prevent confusion, as everyone is used to assertions being compiled out in release. We can introduce a new ASSERT macro that is specifically for debug checks, but I'm doing this wholesale conversion first since we've accumulated thousands of these already, and it's not immediately obvious which ones are suitable for ASSERT.
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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VERIFY(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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VERIFY(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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VERIFY(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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VERIFY(it.m_ptr >= m_code_points);
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VERIFY(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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VERIFY(offset < m_length);
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VERIFY(!Checked<size_t>::addition_would_overflow(offset, length));
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VERIFY((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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