681 lines
20 KiB
C++
681 lines
20 KiB
C++
// Components for manipulating non-owning sequences of characters -*- C++ -*-
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// Copyright (C) 2013-2017 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 3, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// Under Section 7 of GPL version 3, you are granted additional
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// permissions described in the GCC Runtime Library Exception, version
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// 3.1, as published by the Free Software Foundation.
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// You should have received a copy of the GNU General Public License and
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// a copy of the GCC Runtime Library Exception along with this program;
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// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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// <http://www.gnu.org/licenses/>.
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/** @file string_view
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* This is a Standard C++ Library header.
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*/
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//
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// N3762 basic_string_view library
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//
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#ifndef _GLIBCXX_STRING_VIEW
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#define _GLIBCXX_STRING_VIEW 1
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#pragma GCC system_header
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#if __cplusplus <= 201402L
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# include <bits/c++17_warning.h>
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#else
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#include <limits>
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#include <iosfwd>
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#include <bits/char_traits.h>
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#include <bits/functional_hash.h>
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#include <bits/range_access.h>
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namespace std _GLIBCXX_VISIBILITY(default)
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{
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_GLIBCXX_BEGIN_NAMESPACE_VERSION
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/**
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* @class basic_string_view <string_view>
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* @brief A non-owning reference to a string.
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*
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* @ingroup strings
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* @ingroup sequences
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*
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* @tparam _CharT Type of character
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* @tparam _Traits Traits for character type, defaults to
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* char_traits<_CharT>.
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*
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* A basic_string_view looks like this:
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*
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* @code
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* _CharT* _M_str
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* size_t _M_len
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* @endcode
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*/
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template<typename _CharT, typename _Traits = std::char_traits<_CharT>>
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class basic_string_view
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{
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public:
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// types
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using traits_type = _Traits;
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using value_type = _CharT;
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using pointer = const _CharT*;
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using const_pointer = const _CharT*;
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using reference = const _CharT&;
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using const_reference = const _CharT&;
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using const_iterator = const _CharT*;
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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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// [string.view.cons], construct/copy
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constexpr
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basic_string_view() noexcept
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: _M_len{0}, _M_str{nullptr}
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{ }
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constexpr basic_string_view(const basic_string_view&) noexcept = default;
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constexpr basic_string_view(const _CharT* __str)
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: _M_len{__str == nullptr ? 0 : traits_type::length(__str)},
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_M_str{__str}
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{ }
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constexpr basic_string_view(const _CharT* __str, size_type __len)
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: _M_len{__len},
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_M_str{__str}
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{ }
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basic_string_view&
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operator=(const basic_string_view&) noexcept = default;
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// [string.view.iterators], iterators
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constexpr const_iterator
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begin() const noexcept
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{ return this->_M_str; }
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constexpr const_iterator
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end() const noexcept
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{ return this->_M_str + this->_M_len; }
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constexpr const_iterator
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cbegin() const noexcept
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{ return this->_M_str; }
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constexpr const_iterator
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cend() const noexcept
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{ return this->_M_str + this->_M_len; }
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const_reverse_iterator
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rbegin() const noexcept
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{ return const_reverse_iterator(this->end()); }
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const_reverse_iterator
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rend() const noexcept
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{ return const_reverse_iterator(this->begin()); }
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const_reverse_iterator
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crbegin() const noexcept
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{ return const_reverse_iterator(this->end()); }
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const_reverse_iterator
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crend() const noexcept
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{ return const_reverse_iterator(this->begin()); }
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// [string.view.capacity], capacity
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constexpr size_type
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size() const noexcept
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{ return this->_M_len; }
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constexpr size_type
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length() const noexcept
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{ return _M_len; }
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constexpr size_type
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max_size() const noexcept
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{
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return (npos - sizeof(size_type) - sizeof(void*))
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/ sizeof(value_type) / 4;
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}
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constexpr bool
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empty() const noexcept
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{ return this->_M_len == 0; }
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// [string.view.access], element access
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constexpr const _CharT&
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operator[](size_type __pos) const noexcept
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{
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// TODO: Assert to restore in a way compatible with the constexpr.
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// __glibcxx_assert(__pos < this->_M_len);
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return *(this->_M_str + __pos);
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}
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constexpr const _CharT&
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at(size_type __pos) const
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{
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return __pos < this->_M_len
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? *(this->_M_str + __pos)
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: (__throw_out_of_range_fmt(__N("basic_string_view::at: __pos "
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"(which is %zu) >= this->size() "
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"(which is %zu)"),
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__pos, this->size()),
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*this->_M_str);
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}
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constexpr const _CharT&
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front() const
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{
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// TODO: Assert to restore in a way compatible with the constexpr.
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// __glibcxx_assert(this->_M_len > 0);
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return *this->_M_str;
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}
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constexpr const _CharT&
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back() const
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{
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// TODO: Assert to restore in a way compatible with the constexpr.
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// __glibcxx_assert(this->_M_len > 0);
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return *(this->_M_str + this->_M_len - 1);
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}
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constexpr const _CharT*
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data() const noexcept
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{ return this->_M_str; }
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// [string.view.modifiers], modifiers:
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void
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remove_prefix(size_type __n)
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{
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__glibcxx_assert(this->_M_len >= __n);
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this->_M_str += __n;
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this->_M_len -= __n;
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}
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void
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remove_suffix(size_type __n)
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{ this->_M_len -= __n; }
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void
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swap(basic_string_view& __sv) noexcept
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{
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std::swap(this->_M_len, __sv._M_len);
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std::swap(this->_M_str, __sv._M_str);
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}
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// [string.view.ops], string operations:
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size_type
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copy(_CharT* __str, size_type __n, size_type __pos = 0) const
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{
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__glibcxx_requires_string_len(__str, __n);
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if (__pos > this->_M_len)
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__throw_out_of_range_fmt(__N("basic_string_view::copy: __pos "
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"(which is %zu) > this->size() "
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"(which is %zu)"),
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__pos, this->size());
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size_type __rlen{std::min(__n, size_type{this->_M_len - __pos})};
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for (auto __begin = this->_M_str + __pos,
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__end = __begin + __rlen; __begin != __end;)
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*__str++ = *__begin++;
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return __rlen;
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}
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// [string.view.ops], string operations:
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constexpr basic_string_view
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substr(size_type __pos, size_type __n=npos) const
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{
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return __pos <= this->_M_len
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? basic_string_view{this->_M_str + __pos,
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std::min(__n, size_type{this->_M_len - __pos})}
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: (__throw_out_of_range_fmt(__N("basic_string_view::substr: __pos "
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"(which is %zu) > this->size() "
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"(which is %zu)"),
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__pos, this->size()), basic_string_view{});
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}
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int
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compare(basic_string_view __str) const noexcept
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{
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int __ret = traits_type::compare(this->_M_str, __str._M_str,
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std::min(this->_M_len, __str._M_len));
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if (__ret == 0)
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__ret = _S_compare(this->_M_len, __str._M_len);
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return __ret;
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}
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int
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compare(size_type __pos1, size_type __n1, basic_string_view __str) const
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{ return this->substr(__pos1, __n1).compare(__str); }
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int
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compare(size_type __pos1, size_type __n1,
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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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int
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compare(const _CharT* __str) const noexcept
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{ return this->compare(basic_string_view{__str}); }
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int
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compare(size_type __pos1, size_type __n1, const _CharT* __str) const
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{ return this->substr(__pos1, __n1).compare(basic_string_view{__str}); }
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int
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compare(size_type __pos1, size_type __n1,
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const _CharT* __str, size_type __n2) const
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{
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return this->substr(__pos1, __n1)
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.compare(basic_string_view(__str, __n2));
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}
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size_type
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find(basic_string_view __str, size_type __pos = 0) const noexcept
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{ return this->find(__str._M_str, __pos, __str._M_len); }
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size_type
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find(_CharT __c, size_type __pos=0) const noexcept;
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size_type
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find(const _CharT* __str, size_type __pos, size_type __n) const noexcept;
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size_type
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find(const _CharT* __str, size_type __pos=0) const noexcept
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{ return this->find(__str, __pos, traits_type::length(__str)); }
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size_type
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rfind(basic_string_view __str, size_type __pos = npos) const noexcept
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{ return this->rfind(__str._M_str, __pos, __str._M_len); }
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size_type
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rfind(_CharT __c, size_type __pos = npos) const noexcept;
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size_type
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rfind(const _CharT* __str, size_type __pos, size_type __n) const noexcept;
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size_type
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rfind(const _CharT* __str, size_type __pos = npos) const noexcept
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{ return this->rfind(__str, __pos, traits_type::length(__str)); }
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size_type
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find_first_of(basic_string_view __str, size_type __pos = 0) const noexcept
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{ return this->find_first_of(__str._M_str, __pos, __str._M_len); }
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size_type
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find_first_of(_CharT __c, size_type __pos = 0) const noexcept
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{ return this->find(__c, __pos); }
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size_type
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find_first_of(const _CharT* __str, size_type __pos, size_type __n) const;
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size_type
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find_first_of(const _CharT* __str, size_type __pos = 0) const noexcept
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{ return this->find_first_of(__str, __pos, traits_type::length(__str)); }
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size_type
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find_last_of(basic_string_view __str,
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size_type __pos = npos) const noexcept
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{ return this->find_last_of(__str._M_str, __pos, __str._M_len); }
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size_type
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find_last_of(_CharT __c, size_type __pos=npos) const noexcept
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{ return this->rfind(__c, __pos); }
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size_type
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find_last_of(const _CharT* __str, size_type __pos, size_type __n) const;
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size_type
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find_last_of(const _CharT* __str, size_type __pos = npos) const noexcept
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{ return this->find_last_of(__str, __pos, traits_type::length(__str)); }
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size_type
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find_first_not_of(basic_string_view __str,
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size_type __pos = 0) const noexcept
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{ return this->find_first_not_of(__str._M_str, __pos, __str._M_len); }
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size_type
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find_first_not_of(_CharT __c, size_type __pos = 0) const noexcept;
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size_type
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find_first_not_of(const _CharT* __str,
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size_type __pos, size_type __n) const;
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size_type
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find_first_not_of(const _CharT* __str, size_type __pos = 0) const noexcept
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{
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return this->find_first_not_of(__str, __pos,
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traits_type::length(__str));
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}
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size_type
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find_last_not_of(basic_string_view __str,
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size_type __pos = npos) const noexcept
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{ return this->find_last_not_of(__str._M_str, __pos, __str._M_len); }
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size_type
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find_last_not_of(_CharT __c, size_type __pos = npos) const noexcept;
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size_type
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find_last_not_of(const _CharT* __str,
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size_type __pos, size_type __n) const;
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size_type
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find_last_not_of(const _CharT* __str,
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size_type __pos = npos) const noexcept
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{
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return this->find_last_not_of(__str, __pos,
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traits_type::length(__str));
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}
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size_type
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_M_check(size_type __pos, const char* __s) const
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{
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if (__pos > this->size())
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__throw_out_of_range_fmt(__N("%s: __pos (which is %zu) > "
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"this->size() (which is %zu)"),
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__s, __pos, this->size());
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return __pos;
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}
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// NB: _M_limit doesn't check for a bad __pos value.
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size_type
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_M_limit(size_type __pos, size_type __off) const _GLIBCXX_NOEXCEPT
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{
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const bool __testoff = __off < this->size() - __pos;
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return __testoff ? __off : this->size() - __pos;
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}
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private:
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static constexpr int
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_S_compare(size_type __n1, size_type __n2) noexcept
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{
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return difference_type{__n1 - __n2} > std::numeric_limits<int>::max()
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? std::numeric_limits<int>::max()
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: difference_type{__n1 - __n2} < std::numeric_limits<int>::min()
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? std::numeric_limits<int>::min()
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: static_cast<int>(difference_type{__n1 - __n2});
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}
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size_t _M_len;
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const _CharT* _M_str;
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};
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_GLIBCXX_END_NAMESPACE_VERSION
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// [string.view.comparison], non-member basic_string_view comparison function
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namespace __detail
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{
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_GLIBCXX_BEGIN_NAMESPACE_VERSION
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// Identity transform to make ADL work with just one argument.
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// See n3766.html.
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template<typename _Tp = void>
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struct __identity
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{ typedef _Tp type; };
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template<>
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struct __identity<void>;
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template<typename _Tp>
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using __idt = typename __identity<_Tp>::type;
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_GLIBCXX_END_NAMESPACE_VERSION
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}
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_GLIBCXX_BEGIN_NAMESPACE_VERSION
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template<typename _CharT, typename _Traits>
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inline bool
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operator==(basic_string_view<_CharT, _Traits> __x,
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basic_string_view<_CharT, _Traits> __y) noexcept
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{ return __x.compare(__y) == 0; }
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template<typename _CharT, typename _Traits>
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inline bool
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operator==(basic_string_view<_CharT, _Traits> __x,
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__detail::__idt<basic_string_view<_CharT, _Traits>> __y) noexcept
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{ return __x.compare(__y) == 0; }
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template<typename _CharT, typename _Traits>
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inline bool
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operator==(__detail::__idt<basic_string_view<_CharT, _Traits>> __x,
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basic_string_view<_CharT, _Traits> __y) noexcept
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{ return __x.compare(__y) == 0; }
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template<typename _CharT, typename _Traits>
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inline bool
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operator!=(basic_string_view<_CharT, _Traits> __x,
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basic_string_view<_CharT, _Traits> __y) noexcept
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{ return !(__x == __y); }
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template<typename _CharT, typename _Traits>
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inline bool
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operator!=(basic_string_view<_CharT, _Traits> __x,
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__detail::__idt<basic_string_view<_CharT, _Traits>> __y) noexcept
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{ return !(__x == __y); }
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template<typename _CharT, typename _Traits>
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inline bool
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operator!=(__detail::__idt<basic_string_view<_CharT, _Traits>> __x,
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basic_string_view<_CharT, _Traits> __y) noexcept
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{ return !(__x == __y); }
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template<typename _CharT, typename _Traits>
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inline bool
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operator< (basic_string_view<_CharT, _Traits> __x,
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basic_string_view<_CharT, _Traits> __y) noexcept
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{ return __x.compare(__y) < 0; }
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template<typename _CharT, typename _Traits>
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inline bool
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operator< (basic_string_view<_CharT, _Traits> __x,
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__detail::__idt<basic_string_view<_CharT, _Traits>> __y) noexcept
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{ return __x.compare(__y) < 0; }
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template<typename _CharT, typename _Traits>
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inline bool
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operator< (__detail::__idt<basic_string_view<_CharT, _Traits>> __x,
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basic_string_view<_CharT, _Traits> __y) noexcept
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{ return __x.compare(__y) < 0; }
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template<typename _CharT, typename _Traits>
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inline bool
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operator> (basic_string_view<_CharT, _Traits> __x,
|
|
basic_string_view<_CharT, _Traits> __y) noexcept
|
|
{ return __x.compare(__y) > 0; }
|
|
|
|
template<typename _CharT, typename _Traits>
|
|
inline bool
|
|
operator> (basic_string_view<_CharT, _Traits> __x,
|
|
__detail::__idt<basic_string_view<_CharT, _Traits>> __y) noexcept
|
|
{ return __x.compare(__y) > 0; }
|
|
|
|
template<typename _CharT, typename _Traits>
|
|
inline bool
|
|
operator> (__detail::__idt<basic_string_view<_CharT, _Traits>> __x,
|
|
basic_string_view<_CharT, _Traits> __y) noexcept
|
|
{ return __x.compare(__y) > 0; }
|
|
|
|
template<typename _CharT, typename _Traits>
|
|
inline bool
|
|
operator<=(basic_string_view<_CharT, _Traits> __x,
|
|
basic_string_view<_CharT, _Traits> __y) noexcept
|
|
{ return __x.compare(__y) <= 0; }
|
|
|
|
template<typename _CharT, typename _Traits>
|
|
inline bool
|
|
operator<=(basic_string_view<_CharT, _Traits> __x,
|
|
__detail::__idt<basic_string_view<_CharT, _Traits>> __y) noexcept
|
|
{ return __x.compare(__y) <= 0; }
|
|
|
|
template<typename _CharT, typename _Traits>
|
|
inline bool
|
|
operator<=(__detail::__idt<basic_string_view<_CharT, _Traits>> __x,
|
|
basic_string_view<_CharT, _Traits> __y) noexcept
|
|
{ return __x.compare(__y) <= 0; }
|
|
|
|
template<typename _CharT, typename _Traits>
|
|
inline bool
|
|
operator>=(basic_string_view<_CharT, _Traits> __x,
|
|
basic_string_view<_CharT, _Traits> __y) noexcept
|
|
{ return __x.compare(__y) >= 0; }
|
|
|
|
template<typename _CharT, typename _Traits>
|
|
inline bool
|
|
operator>=(basic_string_view<_CharT, _Traits> __x,
|
|
__detail::__idt<basic_string_view<_CharT, _Traits>> __y) noexcept
|
|
{ return __x.compare(__y) >= 0; }
|
|
|
|
template<typename _CharT, typename _Traits>
|
|
inline bool
|
|
operator>=(__detail::__idt<basic_string_view<_CharT, _Traits>> __x,
|
|
basic_string_view<_CharT, _Traits> __y) noexcept
|
|
{ return __x.compare(__y) >= 0; }
|
|
|
|
// [string.view.io], Inserters and extractors
|
|
template<typename _CharT, typename _Traits>
|
|
inline basic_ostream<_CharT, _Traits>&
|
|
operator<<(basic_ostream<_CharT, _Traits>& __os,
|
|
basic_string_view<_CharT,_Traits> __str)
|
|
{ return __ostream_insert(__os, __str.data(), __str.size()); }
|
|
|
|
|
|
// basic_string_view typedef names
|
|
|
|
using string_view = basic_string_view<char>;
|
|
#ifdef _GLIBCXX_USE_WCHAR_T
|
|
using wstring_view = basic_string_view<wchar_t>;
|
|
#endif
|
|
#ifdef _GLIBCXX_USE_C99_STDINT_TR1
|
|
using u16string_view = basic_string_view<char16_t>;
|
|
using u32string_view = basic_string_view<char32_t>;
|
|
#endif
|
|
|
|
// [string.view.hash], hash support:
|
|
|
|
template<typename _Tp>
|
|
struct hash;
|
|
|
|
template<>
|
|
struct hash<string_view>
|
|
: public __hash_base<size_t, string_view>
|
|
{
|
|
size_t
|
|
operator()(const string_view& __str) const noexcept
|
|
{ return std::_Hash_impl::hash(__str.data(), __str.length()); }
|
|
};
|
|
|
|
template<>
|
|
struct __is_fast_hash<hash<string_view>> : std::false_type
|
|
{ };
|
|
|
|
#ifdef _GLIBCXX_USE_WCHAR_T
|
|
template<>
|
|
struct hash<wstring_view>
|
|
: public __hash_base<size_t, wstring>
|
|
{
|
|
size_t
|
|
operator()(const wstring_view& __s) const noexcept
|
|
{ return std::_Hash_impl::hash(__s.data(),
|
|
__s.length() * sizeof(wchar_t)); }
|
|
};
|
|
|
|
template<>
|
|
struct __is_fast_hash<hash<wstring_view>> : std::false_type
|
|
{ };
|
|
#endif
|
|
|
|
#ifdef _GLIBCXX_USE_C99_STDINT_TR1
|
|
template<>
|
|
struct hash<u16string_view>
|
|
: public __hash_base<size_t, u16string_view>
|
|
{
|
|
size_t
|
|
operator()(const u16string_view& __s) const noexcept
|
|
{ return std::_Hash_impl::hash(__s.data(),
|
|
__s.length() * sizeof(char16_t)); }
|
|
};
|
|
|
|
template<>
|
|
struct __is_fast_hash<hash<u16string_view>> : std::false_type
|
|
{ };
|
|
|
|
template<>
|
|
struct hash<u32string_view>
|
|
: public __hash_base<size_t, u32string_view>
|
|
{
|
|
size_t
|
|
operator()(const u32string_view& __s) const noexcept
|
|
{ return std::_Hash_impl::hash(__s.data(),
|
|
__s.length() * sizeof(char32_t)); }
|
|
};
|
|
|
|
template<>
|
|
struct __is_fast_hash<hash<u32string_view>> : std::false_type
|
|
{ };
|
|
#endif
|
|
|
|
inline namespace literals
|
|
{
|
|
inline namespace string_view_literals
|
|
{
|
|
_GLIBCXX_BEGIN_NAMESPACE_VERSION
|
|
|
|
inline constexpr basic_string_view<char>
|
|
operator""sv(const char* __str, size_t __len)
|
|
{ return basic_string_view<char>{__str, __len}; }
|
|
|
|
#ifdef _GLIBCXX_USE_WCHAR_T
|
|
inline constexpr basic_string_view<wchar_t>
|
|
operator""sv(const wchar_t* __str, size_t __len)
|
|
{ return basic_string_view<wchar_t>{__str, __len}; }
|
|
#endif
|
|
|
|
#ifdef _GLIBCXX_USE_C99_STDINT_TR1
|
|
inline constexpr basic_string_view<char16_t>
|
|
operator""sv(const char16_t* __str, size_t __len)
|
|
{ return basic_string_view<char16_t>{__str, __len}; }
|
|
|
|
inline constexpr basic_string_view<char32_t>
|
|
operator""sv(const char32_t* __str, size_t __len)
|
|
{ return basic_string_view<char32_t>{__str, __len}; }
|
|
#endif
|
|
|
|
_GLIBCXX_END_NAMESPACE_VERSION
|
|
} // namespace string_literals
|
|
} // namespace literals
|
|
|
|
_GLIBCXX_END_NAMESPACE_VERSION
|
|
} // namespace std
|
|
|
|
#include <bits/string_view.tcc>
|
|
|
|
#endif // __cplusplus <= 201402L
|
|
|
|
#endif // _GLIBCXX_EXPERIMENTAL_STRING_VIEW
|