mirror of
https://github.com/Atmosphere-NX/Atmosphere-libs.git
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348 lines
16 KiB
C++
348 lines
16 KiB
C++
/*
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* Copyright (c) Atmosphère-NX
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#pragma once
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#include <vapours/common.hpp>
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#include <vapours/assert.hpp>
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namespace ams::util {
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template<class _CharT, class _Traits = std::char_traits<_CharT>>
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class basic_string_view {
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static_assert(!std::is_array<_CharT>::value);
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static_assert(std::is_trivial<_CharT>::value && std::is_standard_layout<_CharT>::value);
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static_assert(std::same_as<_CharT, typename _Traits::char_type>);
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public:
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using traits_type = _Traits;
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using value_type = _CharT;
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using pointer = value_type *;
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using const_pointer = const value_type *;
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using reference = value_type &;
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using const_reference = const value_type &;
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using const_iterator = const value_type *;
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using iterator = const_iterator;
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using const_reverse_iterator = std::reverse_iterator<const_iterator>;
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using reverse_iterator = const_reverse_iterator;
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using size_type = size_t;
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using difference_type = ptrdiff_t;
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static constexpr size_type npos = size_type(-1);
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private:
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static constexpr int _s_compare(size_type lhs, size_type rhs) noexcept {
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const difference_type diff = lhs - rhs;
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if (diff > std::numeric_limits<int>::max()) {
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return std::numeric_limits<int>::max();
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}
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if (diff < std::numeric_limits<int>::min()) {
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return std::numeric_limits<int>::min();
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}
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return static_cast<int>(diff);
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}
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private:
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const_pointer m_str;
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size_type m_len;
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public:
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constexpr basic_string_view() noexcept : m_str(nullptr), m_len(0) { /* ... */ }
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constexpr basic_string_view(const _CharT *str, size_type len) noexcept : m_str(str), m_len(len) { /* ... */ }
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constexpr basic_string_view(const _CharT *str) noexcept : m_str(str), m_len(str ? traits_type::length(str) : 0) { /* ... */ }
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template<std::contiguous_iterator _It, std::sized_sentinel_for<_It> _End> requires std::same_as<std::iter_value_t<_It>, _CharT> && (!std::convertible_to<_End, size_type>)
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constexpr basic_string_view(_It first, _End last) noexcept : m_str(std::to_address(first)), m_len(last - first) { /* ... */ }
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constexpr basic_string_view(const basic_string_view &) noexcept = default;
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constexpr basic_string_view &operator=(const basic_string_view &) noexcept = default;
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constexpr const_iterator begin() const noexcept { return m_str; }
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constexpr const_iterator end() const noexcept { return m_str + m_len; }
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constexpr const_iterator cbegin() const noexcept { return m_str; }
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constexpr const_iterator cend() const noexcept { return m_str + m_len; }
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constexpr const_reverse_iterator rbegin() const noexcept { return const_reverse_iterator(this->end()); }
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constexpr const_reverse_iterator rend() const noexcept { return const_reverse_iterator(this->begin()); }
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constexpr const_reverse_iterator crbegin() const noexcept { return const_reverse_iterator(this->cend()); }
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constexpr const_reverse_iterator crend() const noexcept { return const_reverse_iterator(this->cbegin()); }
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constexpr size_type size() const noexcept { return m_len; }
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constexpr size_type length() const noexcept { return m_len; }
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constexpr size_type max_size() const noexcept { return (npos - sizeof(size_type) - sizeof(void *)) / sizeof(value_type) / 4; }
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[[nodiscard]] constexpr bool empty() const noexcept { return m_len == 0; }
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constexpr const_reference operator[](size_type pos) const noexcept {
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AMS_ASSERT(pos < m_len);
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return *(m_str + pos);
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}
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constexpr const_reference at(size_type pos) const noexcept {
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AMS_ASSERT(pos < m_len);
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AMS_ABORT_UNLESS(pos < m_len);
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return *(m_str + pos);
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}
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constexpr const_reference front() const noexcept {
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AMS_ASSERT(m_len > 0);
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return *m_str;
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}
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constexpr const_reference back() const noexcept {
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AMS_ASSERT(m_len > 0);
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return *(m_str + m_len - 1);
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}
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constexpr const_pointer data() const noexcept { return m_str; }
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constexpr void remove_prefix(size_type n) noexcept {
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AMS_ASSERT(m_len >= n);
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m_str += n;
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m_len -= n;
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}
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constexpr void remove_suffix(size_type n) noexcept {
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AMS_ASSERT(m_len >= n);
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m_len -= n;
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}
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constexpr void swap(basic_string_view &rhs) noexcept {
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auto tmp = *this;
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*this = rhs;
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rhs = tmp;
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}
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constexpr size_type copy(_CharT *str, size_type n, size_type pos = 0) const noexcept {
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AMS_ASSERT(pos <= this->size());
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const size_type rlen = std::min(n, m_len - pos);
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traits_type::copy(str, this->data() + pos, rlen);
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return rlen;
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}
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constexpr basic_string_view substr(size_type pos = 0, size_type n = npos) const noexcept {
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AMS_ASSERT(pos <= this->size());
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const size_type rlen = std::min(n, m_len - pos);
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return basic_string_view{m_str + pos, rlen};
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}
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constexpr int compare(basic_string_view str) const noexcept {
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const size_type rlen = std::min(m_len, str.m_len);
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int ret = traits_type::compare(m_str, str.m_str, rlen);
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if (ret == 0) {
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ret = _s_compare(m_len, str.m_len);
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}
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return ret;
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}
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constexpr int compare(size_type pos, size_type n, basic_string_view str) const noexcept {
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return this->substr(pos, n).compare(str);
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}
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constexpr int compare(size_type pos1, size_type n1, basic_string_view str, size_type pos2, size_type n2) const {
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return this->substr(pos1, n1).compare(str.substr(pos2, n2));
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}
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constexpr int compare(const _CharT *str) const noexcept {
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return this->compare(basic_string_view(str));
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}
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constexpr int compare(size_type pos, size_type n, const _CharT *str) const noexcept {
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return this->substr(pos, n).compare(basic_string_view(str));
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}
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constexpr int compare(size_type pos, size_type n, const _CharT *str, size_type n2) const noexcept {
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return this->substr(pos, n).compare(basic_string_view(str, n2));
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}
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constexpr bool starts_with(basic_string_view x) const noexcept { return this->substr(0, x.size()) == x; }
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constexpr bool starts_with(_CharT x) const noexcept { return !this->empty() && traits_type::eq(this->front(), x); }
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constexpr bool starts_with(const _CharT *x) const noexcept { return this->starts_with(basic_string_view(x)); }
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constexpr bool ends_with(basic_string_view x) const noexcept { return this->size() >= x.size() && this->compare(this->size() - x.size(), npos, x) == 0; }
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constexpr bool ends_with(_CharT x) const noexcept { return !this->empty() && traits_type::eq(this->back(), x); }
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constexpr bool ends_with(const _CharT *x) const noexcept { return this->ends_with(basic_string_view(x)); }
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constexpr size_type find(const _CharT *str, size_type pos, size_type n) const noexcept {
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if (n == 0) {
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return pos + m_len ? pos : npos;
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}
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if (n <= m_len) {
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for (/* ... */; pos <= m_len - n; ++pos) {
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if (traits_type::eq(m_str[pos], str[0]) && traits_type::compare(m_str + pos + 1, str + 1, n - 1) == 0) {
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return pos;
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}
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}
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}
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return npos;
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}
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constexpr size_type find(_CharT c, size_type pos = 0) const noexcept {
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size_type ret = npos;
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if (pos < m_len) {
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const size_type n = m_len - pos;
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if (const _CharT *p = traits_type::find(m_str + pos, n, c); p) {
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ret = p - m_str;
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}
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}
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return ret;
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}
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constexpr size_type find(basic_string_view str, size_type pos = 0) const noexcept { return this->find(str.m_str, pos, str.m_len); }
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__attribute__((nonnull(2)))
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constexpr size_type find(const _CharT *str, size_type pos = 0) const noexcept { return this->find(str, pos, traits_type::length(str)); }
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constexpr size_type rfind(const _CharT *str, size_type pos, size_type n) const noexcept {
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if (n <= m_len) {
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pos = std::min(size_type(m_len - n), pos);
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do {
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if (traits_type::compare(m_str + pos, str, n) == 0) {
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return pos;
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}
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} while (pos-- > 0);
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}
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return npos;
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}
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constexpr size_type rfind(_CharT c, size_type pos = 0) const noexcept {
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size_type size = m_len;
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if (size > 0) {
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if (--size > pos) {
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size = pos;
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}
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for (++size; size-- > 0; /* ... */) {
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if (traits_type::eq(m_str[size], c)) {
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return size;
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}
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}
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}
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return npos;
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}
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constexpr size_type rfind(basic_string_view str, size_type pos = 0) const noexcept { return this->rfind(str.m_str, pos, str.m_len); }
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__attribute__((nonnull(2)))
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constexpr size_type rfind(const _CharT *str, size_type pos = 0) const noexcept { return this->rfind(str, pos, traits_type::length(str)); }
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constexpr size_type find_first_of(const _CharT *str, size_type pos, size_t n) const noexcept {
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for (/* ... */; n && pos < m_len; ++pos) {
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if (const _CharT *p = traits_type::find(str, n, m_str[pos]); p) {
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return pos;
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}
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}
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return npos;
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}
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constexpr size_type find_first_of(basic_string_view str, size_type pos = 0) const noexcept { return this->find_first_of(str.m_str, pos, str.m_len); }
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constexpr size_type find_first_of(_CharT c, size_type pos = 0) const noexcept { return this->find(c, pos); }
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__attribute__((nonnull(2)))
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constexpr size_type find_first_of(const _CharT *str, size_type pos = 0) const noexcept { return this->find_first_of(str, pos, traits_type::length(str)); }
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constexpr size_type find_last_of(const _CharT *str, size_type pos, size_t n) const noexcept {
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size_type size = this->size();
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if (size && n) {
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if (--size > pos) {
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size = pos;
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}
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do {
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if (traits_type::find(str, n, m_str[size])) {
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return size;
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}
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} while (size-- != 0);
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}
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return npos;
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}
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constexpr size_type find_last_of(basic_string_view str, size_type pos = 0) const noexcept { return this->find_last_of(str.m_str, pos, str.m_len); }
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constexpr size_type find_last_of(_CharT c, size_type pos = 0) const noexcept { return this->rfind(c, pos); }
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__attribute__((nonnull(2)))
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constexpr size_type find_last_of(const _CharT *str, size_type pos = 0) const noexcept { return this->find_first_of(str, pos, traits_type::length(str)); }
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constexpr size_type find_first_not_of(const _CharT *str, size_type pos, size_t n) const noexcept {
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for (/* ... */; pos < m_len; ++pos) {
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if (!traits_type::find(str, n, m_str[pos])) {
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return pos;
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}
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}
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return npos;
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}
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constexpr size_type find_first_not_of(_CharT c, size_type pos = 0) const noexcept {
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for (/* ... */; pos < m_len; ++pos) {
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if (!traits_type::eq(m_str[pos], c)) {
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return pos;
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}
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}
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return npos;
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}
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constexpr size_type find_first_not_of(basic_string_view str, size_type pos = 0) const noexcept { return this->find_first_not_of(str.m_str, pos, str.m_len); }
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__attribute__((nonnull(2)))
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constexpr size_type find_first_not_of(const _CharT *str, size_type pos = 0) const noexcept { return this->find_first_not_of(str, pos, traits_type::length(str)); }
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constexpr size_type find_last_not_of(const _CharT *str, size_type pos, size_t n) const noexcept {
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size_type size = this->size();
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if (size) {
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if (--size > pos) {
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size = pos;
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}
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do {
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if (!traits_type::find(str, n, m_str[size])) {
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return size;
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}
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} while (size-- != 0);
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}
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return npos;
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}
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constexpr size_type find_last_not_of(_CharT c, size_type pos = 0) const noexcept {
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size_type size = this->size();
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if (size) {
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if (--size > pos) {
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size = pos;
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}
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do {
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if (!traits_type::eq(m_str[size], c)) {
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return size;
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}
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} while (size-- != 0);
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}
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return npos;
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}
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constexpr size_type find_last_not_of(basic_string_view str, size_type pos = 0) const noexcept { return this->find_last_not_of(str.m_str, pos, str.m_len); }
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__attribute__((nonnull(2)))
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constexpr size_type find_last_not_of(const _CharT *str, size_type pos = 0) const noexcept { return this->find_last_not_of(str, pos, traits_type::length(str)); }
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constexpr friend bool operator==(const basic_string_view &lhs, const basic_string_view &rhs) noexcept { return lhs.compare(rhs) == 0; }
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constexpr friend bool operator!=(const basic_string_view &lhs, const basic_string_view &rhs) noexcept { return lhs.compare(rhs) != 0; }
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constexpr friend bool operator<=(const basic_string_view &lhs, const basic_string_view &rhs) noexcept { return lhs.compare(rhs) <= 0; }
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constexpr friend bool operator>=(const basic_string_view &lhs, const basic_string_view &rhs) noexcept { return lhs.compare(rhs) >= 0; }
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constexpr friend bool operator< (const basic_string_view &lhs, const basic_string_view &rhs) noexcept { return lhs.compare(rhs) < 0; }
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constexpr friend bool operator> (const basic_string_view &lhs, const basic_string_view &rhs) noexcept { return lhs.compare(rhs) > 0; }
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};
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template<std::contiguous_iterator _It, std::sized_sentinel_for<_It> _End>
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basic_string_view(_It, _End) -> basic_string_view<std::iter_value_t<_It>>;
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using string_view = basic_string_view<char>;
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}
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