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https://github.com/LadybirdBrowser/ladybird.git
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6e19ab2bbc
We have a new, improved string type coming up in AK (OOM aware, no null state), and while it's going to use UTF-8, the name UTF8String is a mouthful - so let's free up the String name by renaming the existing class. Making the old one have an annoying name will hopefully also help with quick adoption :^)
108 lines
3.5 KiB
C++
108 lines
3.5 KiB
C++
/*
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* Copyright (c) 2022, the SerenityOS developers.
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/Forward.h>
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namespace AK {
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template<typename Container, typename ValueType>
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class SimpleReverseIterator {
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public:
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friend Container;
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constexpr bool is_end() const { return m_index == SimpleReverseIterator::rend(m_container).m_index; }
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constexpr int index() const { return m_index; }
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constexpr bool operator==(SimpleReverseIterator other) const { return m_index == other.m_index; }
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constexpr bool operator!=(SimpleReverseIterator other) const { return m_index != other.m_index; }
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constexpr bool operator<(SimpleReverseIterator other) const { return m_index < other.m_index; }
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constexpr bool operator>(SimpleReverseIterator other) const { return m_index > other.m_index; }
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constexpr bool operator<=(SimpleReverseIterator other) const { return m_index <= other.m_index; }
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constexpr bool operator>=(SimpleReverseIterator other) const { return m_index >= other.m_index; }
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constexpr SimpleReverseIterator operator+(int delta) const { return SimpleReverseIterator { m_container, m_index - delta }; }
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constexpr SimpleReverseIterator operator-(int delta) const { return SimpleReverseIterator { m_container, m_index + delta }; }
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constexpr SimpleReverseIterator operator++()
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{
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--m_index;
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return *this;
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}
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constexpr SimpleReverseIterator operator++(int)
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{
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--m_index;
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return SimpleReverseIterator { m_container, m_index + 1 };
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}
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constexpr SimpleReverseIterator operator--()
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{
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++m_index;
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return *this;
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}
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constexpr SimpleReverseIterator operator--(int)
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{
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++m_index;
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return SimpleReverseIterator { m_container, m_index - 1 };
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}
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ALWAYS_INLINE constexpr ValueType const& operator*() const { return m_container[m_index]; }
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ALWAYS_INLINE constexpr ValueType& operator*() { return m_container[m_index]; }
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ALWAYS_INLINE constexpr ValueType const* operator->() const { return &m_container[m_index]; }
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ALWAYS_INLINE constexpr ValueType* operator->() { return &m_container[m_index]; }
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SimpleReverseIterator& operator=(SimpleReverseIterator const& other)
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{
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m_index = other.m_index;
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return *this;
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}
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SimpleReverseIterator(SimpleReverseIterator const& obj) = default;
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private:
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static constexpr SimpleReverseIterator rbegin(Container& container)
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{
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using RawContainerType = RemoveCV<Container>;
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if constexpr (IsSame<StringView, RawContainerType> || IsSame<DeprecatedString, RawContainerType>)
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return { container, static_cast<int>(container.length()) - 1 };
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else
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return { container, static_cast<int>(container.size()) - 1 };
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}
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static constexpr SimpleReverseIterator rend(Container& container)
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{
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return { container, -1 };
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}
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constexpr SimpleReverseIterator(Container& container, int index)
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: m_container(container)
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, m_index(index)
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{
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}
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Container& m_container;
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int m_index { 0 };
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};
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namespace ReverseWrapper {
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template<typename Container>
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struct ReverseWrapper {
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Container& container;
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};
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template<typename Container>
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auto begin(ReverseWrapper<Container> wrapper) { return wrapper.container.rbegin(); }
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template<typename Container>
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auto end(ReverseWrapper<Container> wrapper) { return wrapper.container.rend(); }
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template<typename Container>
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ReverseWrapper<Container> in_reverse(Container&& container) { return { container }; }
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}
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}
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