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// Class filesystem::path -*- C++ -*- // Copyright (C) 2014-2021 Free Software Foundation, Inc. // // This file is part of the GNU ISO C++ Library. This library is free // software; you can redistribute it and/or modify it under the // terms of the GNU General Public License as published by the // Free Software Foundation; either version 3, or (at your option) // any later version. // This library is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU General Public License for more details. // Under Section 7 of GPL version 3, you are granted additional // permissions described in the GCC Runtime Library Exception, version // 3.1, as published by the Free Software Foundation. // You should have received a copy of the GNU General Public License and // a copy of the GCC Runtime Library Exception along with this program; // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see // <http://www.gnu.org/licenses/>. /** @file include/bits/fs_path.h * This is an internal header file, included by other library headers. * Do not attempt to use it directly. @headername{filesystem} */ #ifndef _GLIBCXX_FS_PATH_H #define _GLIBCXX_FS_PATH_H 1 #if __cplusplus >= 201703L #include <utility> #include <type_traits> #include <locale> #include <iosfwd> #include <iomanip> #include <codecvt> #include <string_view> #include <system_error> #include <bits/stl_algobase.h> #include <bits/locale_conv.h> #include <ext/concurrence.h> #include <bits/shared_ptr.h> #include <bits/unique_ptr.h> #if __cplusplus > 201703L # include <compare> #endif #if defined(_WIN32) && !defined(__CYGWIN__) # define _GLIBCXX_FILESYSTEM_IS_WINDOWS 1 # include <algorithm> #endif namespace std _GLIBCXX_VISIBILITY(default) { _GLIBCXX_BEGIN_NAMESPACE_VERSION namespace filesystem { _GLIBCXX_BEGIN_NAMESPACE_CXX11 class path; /// @cond undocumented namespace __detail { /// @addtogroup filesystem /// @{ template<typename _CharT> inline constexpr bool __is_encoded_char = false; template<> inline constexpr bool __is_encoded_char<char> = true; #ifdef _GLIBCXX_USE_CHAR8_T template<> inline constexpr bool __is_encoded_char<char8_t> = true; #endif #if _GLIBCXX_USE_WCHAR_T template<> inline constexpr bool __is_encoded_char<wchar_t> = true; #endif template<> inline constexpr bool __is_encoded_char<char16_t> = true; template<> inline constexpr bool __is_encoded_char<char32_t> = true; #if __cpp_concepts >= 201907L template<typename _Iter> using __safe_iterator_traits = std::iterator_traits<_Iter>; #else template<typename _Iter> struct __safe_iterator_traits : std::iterator_traits<_Iter> { }; // Protect against ill-formed iterator_traits specializations in C++17 template<> struct __safe_iterator_traits<void*> { }; template<> struct __safe_iterator_traits<const void*> { }; template<> struct __safe_iterator_traits<volatile void*> { }; template<> struct __safe_iterator_traits<const volatile void*> { }; #endif template<typename _Iter_traits, typename = void> struct __is_path_iter_src : false_type { }; template<typename _Iter_traits> struct __is_path_iter_src<_Iter_traits, void_t<typename _Iter_traits::value_type>> : bool_constant<__is_encoded_char<typename _Iter_traits::value_type>> { }; template<typename _Source> inline constexpr bool __is_path_src = __is_path_iter_src<iterator_traits<decay_t<_Source>>>::value; template<> inline constexpr bool __is_path_src<path> = false; template<> inline constexpr bool __is_path_src<volatile path> = false; template<> inline constexpr bool __is_path_src<void*> = false; template<> inline constexpr bool __is_path_src<const void*> = false; template<> inline constexpr bool __is_path_src<volatile void*> = false; template<> inline constexpr bool __is_path_src<const volatile void*> = false; template<typename _CharT, typename _Traits, typename _Alloc> inline constexpr bool __is_path_src<basic_string<_CharT, _Traits, _Alloc>> = __is_encoded_char<_CharT>; template<typename _CharT, typename _Traits> inline constexpr bool __is_path_src<basic_string_view<_CharT, _Traits>> = __is_encoded_char<_CharT>; // SFINAE constraint for Source parameters as required by [fs.path.req]. template<typename _Tp> using _Path = enable_if_t<__is_path_src<_Tp>, path>; // SFINAE constraint for InputIterator parameters as required by [fs.req]. template<typename _Iter, typename _Tr = __safe_iterator_traits<_Iter>> using _Path2 = enable_if_t<__is_path_iter_src<_Tr>::value, path>; // The __effective_range overloads convert a Source parameter into // either a basic_string_view or basic_string containing the // effective range of the Source, as defined in [fs.path.req]. template<typename _CharT, typename _Traits, typename _Alloc> inline basic_string_view<_CharT, _Traits> __effective_range(const basic_string<_CharT, _Traits, _Alloc>& __source) { return __source; } template<typename _CharT, typename _Traits> inline const basic_string_view<_CharT, _Traits>& __effective_range(const basic_string_view<_CharT, _Traits>& __source) { return __source; } template<typename _Source> inline auto __effective_range(const _Source& __source) { if constexpr (is_pointer_v<decay_t<_Source>>) return basic_string_view{&*__source}; else { // _Source is an input iterator that iterates over an NTCTS. // Create a basic_string by reading until the null character. using value_type = typename iterator_traits<_Source>::value_type; basic_string<value_type> __str; _Source __it = __source; for (value_type __ch = *__it; __ch != value_type(); __ch = *++__it) __str.push_back(__ch); return __str; } } // The value type of a Source parameter's effective range. template<typename _Tp> using __value_t = typename remove_reference_t< decltype(__detail::__effective_range(std::declval<_Tp>()))>::value_type; // SFINAE helper to check that an effective range has value_type char, // as required by path constructors taking a std::locale parameter. // The type _Tp must have already been checked by _Path<Tp> or _Path2<_Tp>. template<typename _Tp, typename _Val = __value_t<_Tp>> using __value_type_is_char = std::enable_if_t<std::is_same_v<_Val, char>, _Val>; // As above, but also allows char8_t, as required by u8path // C++20 [depr.fs.path.factory] template<typename _Tp, typename _Val = __value_t<_Tp>> using __value_type_is_char_or_char8_t = std::enable_if_t<std::is_same_v<_Val, char> #ifdef _GLIBCXX_USE_CHAR8_T || std::is_same_v<_Val, char8_t> #endif , _Val>; // Create a string or string view from an iterator range. template<typename _InputIterator> inline auto __string_from_range(_InputIterator __first, _InputIterator __last) { using _EcharT = typename std::iterator_traits<_InputIterator>::value_type; static_assert(__is_encoded_char<_EcharT>); #if __cpp_lib_concepts constexpr bool __contiguous = std::contiguous_iterator<_InputIterator>; #else constexpr bool __contiguous = is_pointer_v<decltype(std::__niter_base(__first))>; #endif if constexpr (__contiguous) { // For contiguous iterators we can just return a string view. const auto* __f = std::__to_address(std::__niter_base(__first)); const auto* __l = std::__to_address(std::__niter_base(__last)); return basic_string_view<_EcharT>(__f, __l - __f); } else // Conversion requires contiguous characters, so create a string. return basic_string<_EcharT>(__first, __last); } /// @} group filesystem } // namespace __detail /// @endcond /// @addtogroup filesystem /// @{ /// A filesystem path /// @ingroup filesystem class path { public: #ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS using value_type = wchar_t; static constexpr value_type preferred_separator = L'\\'; #else # ifdef _GLIBCXX_DOXYGEN /// Windows uses wchar_t for path::value_type, POSIX uses char. using value_type = __os_dependent__; # else using value_type = char; # endif static constexpr value_type preferred_separator = '/'; #endif using string_type = std::basic_string<value_type>; /// path::format is ignored in this implementation enum format : unsigned char { native_format, generic_format, auto_format }; // constructors and destructor path() noexcept { } path(const path& __p) = default; path(path&& __p) #if _GLIBCXX_USE_CXX11_ABI || _GLIBCXX_FULLY_DYNAMIC_STRING == 0 noexcept #endif : _M_pathname(std::move(__p._M_pathname)), _M_cmpts(std::move(__p._M_cmpts)) { __p.clear(); } path(string_type&& __source, format = auto_format) : _M_pathname(std::move(__source)) { _M_split_cmpts(); } template<typename _Source, typename _Require = __detail::_Path<_Source>> path(_Source const& __source, format = auto_format) : _M_pathname(_S_convert(__detail::__effective_range(__source))) { _M_split_cmpts(); } template<typename _InputIterator, typename _Require = __detail::_Path2<_InputIterator>> path(_InputIterator __first, _InputIterator __last, format = auto_format) : _M_pathname(_S_convert(__detail::__string_from_range(__first, __last))) { _M_split_cmpts(); } template<typename _Source, typename _Require = __detail::_Path<_Source>, typename _Require2 = __detail::__value_type_is_char<_Source>> path(_Source const& __src, const locale& __loc, format = auto_format) : _M_pathname(_S_convert_loc(__detail::__effective_range(__src), __loc)) { _M_split_cmpts(); } template<typename _InputIterator, typename _Require = __detail::_Path2<_InputIterator>, typename _Req2 = __detail::__value_type_is_char<_InputIterator>> path(_InputIterator __first, _InputIterator __last, const locale& __loc, format = auto_format) : _M_pathname(_S_convert_loc(__first, __last, __loc)) { _M_split_cmpts(); } ~path() = default; // assignments path& operator=(const path&); path& operator=(path&&) noexcept; path& operator=(string_type&& __source); path& assign(string_type&& __source); template<typename _Source> __detail::_Path<_Source>& operator=(_Source const& __source) { return *this = path(__source); } template<typename _Source> __detail::_Path<_Source>& assign(_Source const& __source) { return *this = path(__source); } template<typename _InputIterator> __detail::_Path2<_InputIterator>& assign(_InputIterator __first, _InputIterator __last) { return *this = path(__first, __last); } // appends path& operator/=(const path& __p); template<typename _Source> __detail::_Path<_Source>& operator/=(_Source const& __source) { _M_append(_S_convert(__detail::__effective_range(__source))); return *this; } template<typename _Source> __detail::_Path<_Source>& append(_Source const& __source) { _M_append(_S_convert(__detail::__effective_range(__source))); return *this; } template<typename _InputIterator> __detail::_Path2<_InputIterator>& append(_InputIterator __first, _InputIterator __last) { _M_append(_S_convert(__detail::__string_from_range(__first, __last))); return *this; } // concatenation path& operator+=(const path& __x); path& operator+=(const string_type& __x); path& operator+=(const value_type* __x); path& operator+=(value_type __x); path& operator+=(basic_string_view<value_type> __x); template<typename _Source> __detail::_Path<_Source>& operator+=(_Source const& __x) { return concat(__x); } template<typename _CharT> __detail::_Path2<_CharT*>& operator+=(_CharT __x); template<typename _Source> __detail::_Path<_Source>& concat(_Source const& __x) { _M_concat(_S_convert(__detail::__effective_range(__x))); return *this; } template<typename _InputIterator> __detail::_Path2<_InputIterator>& concat(_InputIterator __first, _InputIterator __last) { _M_concat(_S_convert(__detail::__string_from_range(__first, __last))); return *this; } // modifiers void clear() noexcept { _M_pathname.clear(); _M_split_cmpts(); } path& make_preferred(); path& remove_filename(); path& replace_filename(const path& __replacement); path& replace_extension(const path& __replacement = path()); void swap(path& __rhs) noexcept; // native format observers const string_type& native() const noexcept { return _M_pathname; } const value_type* c_str() const noexcept { return _M_pathname.c_str(); } operator string_type() const { return _M_pathname; } template<typename _CharT, typename _Traits = std::char_traits<_CharT>, typename _Allocator = std::allocator<_CharT>> std::basic_string<_CharT, _Traits, _Allocator> string(const _Allocator& __a = _Allocator()) const; std::string string() const; #if _GLIBCXX_USE_WCHAR_T std::wstring wstring() const; #endif #ifdef _GLIBCXX_USE_CHAR8_T __attribute__((__abi_tag__("__u8"))) std::u8string u8string() const; #else std::string u8string() const; #endif // _GLIBCXX_USE_CHAR8_T std::u16string u16string() const; std::u32string u32string() const; // generic format observers template<typename _CharT, typename _Traits = std::char_traits<_CharT>, typename _Allocator = std::allocator<_CharT>> std::basic_string<_CharT, _Traits, _Allocator> generic_string(const _Allocator& __a = _Allocator()) const; std::string generic_string() const; #if _GLIBCXX_USE_WCHAR_T std::wstring generic_wstring() const; #endif #ifdef _GLIBCXX_USE_CHAR8_T __attribute__((__abi_tag__("__u8"))) std::u8string generic_u8string() const; #else std::string generic_u8string() const; #endif // _GLIBCXX_USE_CHAR8_T std::u16string generic_u16string() const; std::u32string generic_u32string() const; // compare int compare(const path& __p) const noexcept; int compare(const string_type& __s) const noexcept; int compare(const value_type* __s) const noexcept; int compare(basic_string_view<value_type> __s) const noexcept; // decomposition path root_name() const; path root_directory() const; path root_path() const; path relative_path() const; path parent_path() const; path filename() const; path stem() const; path extension() const; // query [[nodiscard]] bool empty() const noexcept { return _M_pathname.empty(); } bool has_root_name() const noexcept; bool has_root_directory() const noexcept; bool has_root_path() const noexcept; bool has_relative_path() const noexcept; bool has_parent_path() const noexcept; bool has_filename() const noexcept; bool has_stem() const noexcept; bool has_extension() const noexcept; bool is_absolute() const noexcept; bool is_relative() const noexcept { return !is_absolute(); } // generation path lexically_normal() const; path lexically_relative(const path& base) const; path lexically_proximate(const path& base) const; // iterators class iterator; using const_iterator = iterator; iterator begin() const; iterator end() const; /// Write a path to a stream template<typename _CharT, typename _Traits> friend std::basic_ostream<_CharT, _Traits>& operator<<(std::basic_ostream<_CharT, _Traits>& __os, const path& __p) { __os << std::quoted(__p.string<_CharT, _Traits>()); return __os; } /// Read a path from a stream template<typename _CharT, typename _Traits> friend std::basic_istream<_CharT, _Traits>& operator>>(std::basic_istream<_CharT, _Traits>& __is, path& __p) { std::basic_string<_CharT, _Traits> __tmp; if (__is >> std::quoted(__tmp)) __p = std::move(__tmp); return __is; } // non-member operators /// Compare paths friend bool operator==(const path& __lhs, const path& __rhs) noexcept { return path::_S_compare(__lhs, __rhs) == 0; } #if __cpp_lib_three_way_comparison /// Compare paths friend strong_ordering operator<=>(const path& __lhs, const path& __rhs) noexcept { return path::_S_compare(__lhs, __rhs) <=> 0; } #else /// Compare paths friend bool operator!=(const path& __lhs, const path& __rhs) noexcept { return !(__lhs == __rhs); } /// Compare paths friend bool operator<(const path& __lhs, const path& __rhs) noexcept { return __lhs.compare(__rhs) < 0; } /// Compare paths friend bool operator<=(const path& __lhs, const path& __rhs) noexcept { return !(__rhs < __lhs); } /// Compare paths friend bool operator>(const path& __lhs, const path& __rhs) noexcept { return __rhs < __lhs; } /// Compare paths friend bool operator>=(const path& __lhs, const path& __rhs) noexcept { return !(__lhs < __rhs); } #endif /// Append one path to another friend path operator/(const path& __lhs, const path& __rhs) { path __result(__lhs); __result /= __rhs; return __result; } private: enum class _Type : unsigned char { _Multi = 0, _Root_name, _Root_dir, _Filename }; path(basic_string_view<value_type> __str, _Type __type); enum class _Split { _Stem, _Extension }; void _M_append(basic_string_view<value_type>); void _M_concat(basic_string_view<value_type>); pair<const string_type*, size_t> _M_find_extension() const noexcept; // path::_S_convert creates a basic_string<value_type> or // basic_string_view<value_type> from a range (either the effective // range of a Source parameter, or a pair of InputIterator parameters), // performing the conversions required by [fs.path.type.cvt]. // If the value_type of the range value type is path::value_type, // no encoding conversion is performed. If the range is contiguous // a string_view static string_type _S_convert(string_type __str) { return __str; } template<typename _Tp> static auto _S_convert(const _Tp& __str) { if constexpr (is_same_v<_Tp, string_type>) return __str; else if constexpr (is_same_v<_Tp, basic_string_view<value_type>>) return __str; else if constexpr (is_same_v<typename _Tp::value_type, value_type>) return basic_string_view<value_type>(__str.data(), __str.size()); else return _S_convert(__str.data(), __str.data() + __str.size()); } template<typename _EcharT> static auto _S_convert(const _EcharT* __first, const _EcharT* __last); static string_type _S_convert_loc(const char* __first, const char* __last, const std::locale& __loc); template<typename _Iter> static string_type _S_convert_loc(_Iter __first, _Iter __last, const std::locale& __loc) { const auto __s = __detail::__string_from_range(__first, __last); return _S_convert_loc(__s.data(), __s.data() + __s.size(), __loc); } template<typename _Tp> static string_type _S_convert_loc(const _Tp& __s, const std::locale& __loc) { return _S_convert_loc(__s.data(), __s.data() + __s.size(), __loc); } template<typename _CharT, typename _Traits, typename _Allocator> static basic_string<_CharT, _Traits, _Allocator> _S_str_convert(basic_string_view<value_type>, const _Allocator&); // Returns lhs.compare(rhs), but defined after path::iterator is complete. __attribute__((__always_inline__)) static int _S_compare(const path& __lhs, const path& __rhs) noexcept; void _M_split_cmpts(); _Type _M_type() const noexcept { return _M_cmpts.type(); } string_type _M_pathname; struct _Cmpt; struct _List { using value_type = _Cmpt; using iterator = value_type*; using const_iterator = const value_type*; _List(); _List(const _List&); _List(_List&&) = default; _List& operator=(const _List&); _List& operator=(_List&&) = default; ~_List() = default; _Type type() const noexcept { return _Type(reinterpret_cast<uintptr_t>(_M_impl.get()) & 0x3); } void type(_Type) noexcept; int size() const noexcept; // zero unless type() == _Type::_Multi bool empty() const noexcept; // true unless type() == _Type::_Multi void clear(); void swap(_List& __l) noexcept { _M_impl.swap(__l._M_impl); } int capacity() const noexcept; void reserve(int, bool); ///< @pre type() == _Type::_Multi // All the member functions below here have a precondition !empty() // (and they should only be called from within the library). iterator begin() noexcept; iterator end() noexcept; const_iterator begin() const noexcept; const_iterator end() const noexcept; value_type& front() noexcept; value_type& back() noexcept; const value_type& front() const noexcept; const value_type& back() const noexcept; void pop_back(); void _M_erase_from(const_iterator __pos); // erases [__pos,end()) struct _Impl; struct _Impl_deleter { void operator()(_Impl*) const noexcept; }; unique_ptr<_Impl, _Impl_deleter> _M_impl; }; _List _M_cmpts; struct _Parser; template<typename _EcharT> struct _Codecvt; }; /// @{ /// @relates std::filesystem::path inline void swap(path& __lhs, path& __rhs) noexcept { __lhs.swap(__rhs); } size_t hash_value(const path& __p) noexcept; /// @} /// Exception type thrown by the Filesystem library class filesystem_error : public std::system_error { public: filesystem_error(const string& __what_arg, error_code __ec); filesystem_error(const string& __what_arg, const path& __p1, error_code __ec); filesystem_error(const string& __what_arg, const path& __p1, const path& __p2, error_code __ec); filesystem_error(const filesystem_error&) = default; filesystem_error& operator=(const filesystem_error&) = default; // No move constructor or assignment operator. // Copy rvalues instead, so that _M_impl is not left empty. ~filesystem_error(); const path& path1() const noexcept; const path& path2() const noexcept; const char* what() const noexcept; private: struct _Impl; std::__shared_ptr<const _Impl> _M_impl; }; /// @cond undocumented namespace __detail { [[noreturn]] inline void __throw_conversion_error() { _GLIBCXX_THROW_OR_ABORT(filesystem_error( "Cannot convert character sequence", std::make_error_code(errc::illegal_byte_sequence))); } #ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS template<typename _Tp> inline std::wstring __wstr_from_utf8(const _Tp& __str) { static_assert(std::is_same_v<typename _Tp::value_type, char>); std::wstring __wstr; // XXX This assumes native wide encoding is UTF-16. std::codecvt_utf8_utf16<wchar_t> __wcvt; const auto __p = __str.data(); if (!__str_codecvt_in_all(__p, __p + __str.size(), __wstr, __wcvt)) __detail::__throw_conversion_error(); return __wstr; } #endif } // namespace __detail /// @endcond /** Create a path from a UTF-8-encoded sequence of char * * @relates std::filesystem::path */ template<typename _InputIterator, typename _Require = __detail::_Path2<_InputIterator>, typename _CharT = __detail::__value_type_is_char_or_char8_t<_InputIterator>> inline path u8path(_InputIterator __first, _InputIterator __last) { #ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS if constexpr (is_same_v<_CharT, char>) return path{ __detail::__wstr_from_utf8( __detail::__string_from_range(__first, __last)) }; else return path{ __first, __last }; // constructor handles char8_t #else // This assumes native normal encoding is UTF-8. return path{ __first, __last }; #endif } /** Create a path from a UTF-8-encoded sequence of char * * @relates std::filesystem::path */ template<typename _Source, typename _Require = __detail::_Path<_Source>, typename _CharT = __detail::__value_type_is_char_or_char8_t<_Source>> inline path u8path(const _Source& __source) { #ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS if constexpr (is_same_v<_CharT, char>) return path{ __detail::__wstr_from_utf8( __detail::__effective_range(__source)) }; else return path{ __source }; // constructor handles char8_t #else // This assumes native normal encoding is UTF-8. return path{ __source }; #endif } /// @cond undocumented struct path::_Cmpt : path { _Cmpt(basic_string_view<value_type> __s, _Type __t, size_t __pos); _Cmpt() : _M_pos(-1) { } size_t _M_pos; }; // path::_Codecvt<C> Performs conversions between C and path::string_type. // The native encoding of char strings is the OS-dependent current // encoding for pathnames. FIXME: We assume this is UTF-8 everywhere, // but should use a Windows API to query it. // Converts between native pathname encoding and char16_t or char32_t. template<typename _EcharT> struct path::_Codecvt // Need derived class here because std::codecvt has protected destructor. : std::codecvt<_EcharT, char, mbstate_t> { }; // Converts between native pathname encoding and native wide encoding. // The native encoding for wide strings is the execution wide-character // set encoding. FIXME: We assume that this is either UTF-32 or UTF-16 // (depending on the width of wchar_t). That matches GCC's default, // but can be changed with -fwide-exec-charset. // We need a custom codecvt converting the native pathname encoding // to/from the native wide encoding. template<> struct path::_Codecvt<wchar_t> : conditional_t<sizeof(wchar_t) == sizeof(char32_t), std::codecvt_utf8<wchar_t>, // UTF-8 <-> UTF-32 std::codecvt_utf8_utf16<wchar_t>> // UTF-8 <-> UTF-16 { }; template<typename _EcharT> auto path::_S_convert(const _EcharT* __f, const _EcharT* __l) { static_assert(__detail::__is_encoded_char<_EcharT>); #ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS # define _GLIBCXX_CONV_FROM_UTF8(S) __detail::__wstr_from_utf8(S) #else # define _GLIBCXX_CONV_FROM_UTF8(S) S #endif if constexpr (is_same_v<_EcharT, value_type>) return basic_string_view<value_type>(__f, __l - __f); #ifdef _GLIBCXX_USE_CHAR8_T else if constexpr (is_same_v<_EcharT, char8_t>) { string_view __str(reinterpret_cast<const char*>(__f), __l - __f); return _GLIBCXX_CONV_FROM_UTF8(__str); } #endif #ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS else if constexpr (is_same_v<_EcharT, char>) { std::wstring __wstr; path::_Codecvt<wchar_t> __cvt; if (__str_codecvt_in_all(__f, __l, __wstr, __cvt)) return __wstr; } #endif else { path::_Codecvt<_EcharT> __cvt; std::string __str; if (__str_codecvt_out_all(__f, __l, __str, __cvt)) return _GLIBCXX_CONV_FROM_UTF8(__str); } __detail::__throw_conversion_error(); } #undef _GLIBCXX_CONV_FROM_UTF8 /// @endcond /// An iterator for the components of a path class path::iterator { public: using difference_type = std::ptrdiff_t; using value_type = path; using reference = const path&; using pointer = const path*; using iterator_category = std::bidirectional_iterator_tag; iterator() : _M_path(nullptr), _M_cur(), _M_at_end() { } iterator(const iterator&) = default; iterator& operator=(const iterator&) = default; reference operator*() const; pointer operator->() const { return std::__addressof(**this); } iterator& operator++(); iterator operator++(int) { auto __tmp = *this; ++*this; return __tmp; } iterator& operator--(); iterator operator--(int) { auto __tmp = *this; --*this; return __tmp; } friend bool operator==(const iterator& __lhs, const iterator& __rhs) { return __lhs._M_equals(__rhs); } friend bool operator!=(const iterator& __lhs, const iterator& __rhs) { return !__lhs._M_equals(__rhs); } private: friend class path; bool _M_is_multi() const { return _M_path->_M_type() == _Type::_Multi; } friend difference_type __path_iter_distance(const iterator& __first, const iterator& __last) { __glibcxx_assert(__first._M_path != nullptr); __glibcxx_assert(__first._M_path == __last._M_path); if (__first._M_is_multi()) return std::distance(__first._M_cur, __last._M_cur); else if (__first._M_at_end == __last._M_at_end) return 0; else return __first._M_at_end ? -1 : 1; } friend void __path_iter_advance(iterator& __i, difference_type __n) { if (__n == 1) ++__i; else if (__n == -1) --__i; else if (__n != 0) { __glibcxx_assert(__i._M_path != nullptr); __glibcxx_assert(__i._M_is_multi()); // __glibcxx_assert(__i._M_path->_M_cmpts.end() - __i._M_cur >= __n); __i._M_cur += __n; } } iterator(const path* __path, path::_List::const_iterator __iter) : _M_path(__path), _M_cur(__iter), _M_at_end() { } iterator(const path* __path, bool __at_end) : _M_path(__path), _M_cur(), _M_at_end(__at_end) { } bool _M_equals(iterator) const; const path* _M_path; path::_List::const_iterator _M_cur; bool _M_at_end; // only used when type != _Multi }; inline path& path::operator=(path&& __p) noexcept { if (&__p == this) [[__unlikely__]] return *this; _M_pathname = std::move(__p._M_pathname); _M_cmpts = std::move(__p._M_cmpts); __p.clear(); return *this; } inline path& path::operator=(string_type&& __source) { return *this = path(std::move(__source)); } inline path& path::assign(string_type&& __source) { return *this = path(std::move(__source)); } inline path& path::operator+=(const string_type& __x) { _M_concat(__x); return *this; } inline path& path::operator+=(const value_type* __x) { _M_concat(__x); return *this; } inline path& path::operator+=(value_type __x) { _M_concat(basic_string_view<value_type>(&__x, 1)); return *this; } inline path& path::operator+=(basic_string_view<value_type> __x) { _M_concat(__x); return *this; } template<typename _CharT> inline __detail::_Path2<_CharT*>& path::operator+=(const _CharT __x) { _M_concat(_S_convert(&__x, &__x + 1)); return *this; } inline path& path::make_preferred() { #ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS std::replace(_M_pathname.begin(), _M_pathname.end(), L'/', preferred_separator); #endif return *this; } inline void path::swap(path& __rhs) noexcept { _M_pathname.swap(__rhs._M_pathname); _M_cmpts.swap(__rhs._M_cmpts); } /// @cond undocumented template<typename _CharT, typename _Traits, typename _Allocator> std::basic_string<_CharT, _Traits, _Allocator> path::_S_str_convert(basic_string_view<value_type> __str, const _Allocator& __a) { static_assert(!is_same_v<_CharT, value_type>); using _WString = basic_string<_CharT, _Traits, _Allocator>; if (__str.size() == 0) return _WString(__a); #ifndef _GLIBCXX_FILESYSTEM_IS_WINDOWS string_view __u8str = __str; #else // First convert native string from UTF-16 to to UTF-8. // XXX This assumes that the execution wide-character set is UTF-16. std::codecvt_utf8_utf16<value_type> __cvt; using _CharAlloc = __alloc_rebind<_Allocator, char>; using _String = basic_string<char, char_traits<char>, _CharAlloc>; _String __u8str{_CharAlloc{__a}}; const value_type* __wfirst = __str.data(); const value_type* __wlast = __wfirst + __str.size(); if (!__str_codecvt_out_all(__wfirst, __wlast, __u8str, __cvt)) __detail::__throw_conversion_error(); if constexpr (is_same_v<_CharT, char>) return __u8str; // XXX assumes native ordinary encoding is UTF-8. else #endif { const char* __first = __u8str.data(); const char* __last = __first + __u8str.size(); // Convert UTF-8 string to requested format. #ifdef _GLIBCXX_USE_CHAR8_T if constexpr (is_same_v<_CharT, char8_t>) return _WString(__first, __last, __a); else #endif { // Convert UTF-8 to wide string. _WString __wstr(__a); path::_Codecvt<_CharT> __cvt; if (__str_codecvt_in_all(__first, __last, __wstr, __cvt)) return __wstr; } } __detail::__throw_conversion_error(); } /// @endcond template<typename _CharT, typename _Traits, typename _Allocator> inline basic_string<_CharT, _Traits, _Allocator> path::string(const _Allocator& __a) const { if constexpr (is_same_v<_CharT, value_type>) return { _M_pathname.c_str(), _M_pathname.length(), __a }; else return _S_str_convert<_CharT, _Traits>(_M_pathname, __a); } inline std::string path::string() const { return string<char>(); } #if _GLIBCXX_USE_WCHAR_T inline std::wstring path::wstring() const { return string<wchar_t>(); } #endif #ifdef _GLIBCXX_USE_CHAR8_T inline std::u8string path::u8string() const { return string<char8_t>(); } #else inline std::string path::u8string() const { #ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS std::string __str; // convert from native wide encoding (assumed to be UTF-16) to UTF-8 std::codecvt_utf8_utf16<value_type> __cvt; const value_type* __first = _M_pathname.data(); const value_type* __last = __first + _M_pathname.size(); if (__str_codecvt_out_all(__first, __last, __str, __cvt)) return __str; __detail::__throw_conversion_error(); #else return _M_pathname; #endif } #endif // _GLIBCXX_USE_CHAR8_T inline std::u16string path::u16string() const { return string<char16_t>(); } inline std::u32string path::u32string() const { return string<char32_t>(); } template<typename _CharT, typename _Traits, typename _Allocator> inline std::basic_string<_CharT, _Traits, _Allocator> path::generic_string(const _Allocator& __a) const { #ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS const value_type __slash = L'/'; #else const value_type __slash = '/'; #endif using _Alloc2 = typename allocator_traits<_Allocator>::template rebind_alloc<value_type>; basic_string<value_type, char_traits<value_type>, _Alloc2> __str(__a); if (_M_type() == _Type::_Root_dir) __str.assign(1, __slash); else { __str.reserve(_M_pathname.size()); bool __add_slash = false; for (auto& __elem : *this) { #ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS if (__elem._M_type() == _Type::_Root_dir) { __str += __slash; continue; } #endif if (__add_slash) __str += __slash; __str += basic_string_view<value_type>(__elem._M_pathname); __add_slash = __elem._M_type() == _Type::_Filename; } } if constexpr (is_same_v<_CharT, value_type>) return __str; else return _S_str_convert<_CharT, _Traits>(__str, __a); } inline std::string path::generic_string() const { return generic_string<char>(); } #if _GLIBCXX_USE_WCHAR_T inline std::wstring path::generic_wstring() const { return generic_string<wchar_t>(); } #endif #ifdef _GLIBCXX_USE_CHAR8_T inline std::u8string path::generic_u8string() const { return generic_string<char8_t>(); } #else inline std::string path::generic_u8string() const { return generic_string(); } #endif inline std::u16string path::generic_u16string() const { return generic_string<char16_t>(); } inline std::u32string path::generic_u32string() const { return generic_string<char32_t>(); } inline int path::compare(const string_type& __s) const noexcept { return compare(basic_string_view<value_type>(__s)); } inline int path::compare(const value_type* __s) const noexcept { return compare(basic_string_view<value_type>(__s)); } inline path path::filename() const { if (empty()) return {}; else if (_M_type() == _Type::_Filename) return *this; else if (_M_type() == _Type::_Multi) { if (_M_pathname.back() == preferred_separator) return {}; auto __last = --end(); if (__last->_M_type() == _Type::_Filename) return *__last; } return {}; } inline path path::stem() const { auto ext = _M_find_extension(); if (ext.first && ext.second != 0) return path{ext.first->substr(0, ext.second)}; return {}; } inline path path::extension() const { auto ext = _M_find_extension(); if (ext.first && ext.second != string_type::npos) return path{ext.first->substr(ext.second)}; return {}; } inline bool path::has_stem() const noexcept { auto ext = _M_find_extension(); return ext.first && ext.second != 0; } inline bool path::has_extension() const noexcept { auto ext = _M_find_extension(); return ext.first && ext.second != string_type::npos; } inline bool path::is_absolute() const noexcept { #ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS return has_root_name() && has_root_directory(); #else return has_root_directory(); #endif } inline path::iterator path::begin() const { if (_M_type() == _Type::_Multi) return iterator(this, _M_cmpts.begin()); return iterator(this, empty()); } inline path::iterator path::end() const { if (_M_type() == _Type::_Multi) return iterator(this, _M_cmpts.end()); return iterator(this, true); } inline path::iterator& path::iterator::operator++() { __glibcxx_assert(_M_path != nullptr); if (_M_path->_M_type() == _Type::_Multi) { __glibcxx_assert(_M_cur != _M_path->_M_cmpts.end()); ++_M_cur; } else { __glibcxx_assert(!_M_at_end); _M_at_end = true; } return *this; } inline path::iterator& path::iterator::operator--() { __glibcxx_assert(_M_path != nullptr); if (_M_path->_M_type() == _Type::_Multi) { __glibcxx_assert(_M_cur != _M_path->_M_cmpts.begin()); --_M_cur; } else { __glibcxx_assert(_M_at_end); _M_at_end = false; } return *this; } inline path::iterator::reference path::iterator::operator*() const { __glibcxx_assert(_M_path != nullptr); if (_M_path->_M_type() == _Type::_Multi) { __glibcxx_assert(_M_cur != _M_path->_M_cmpts.end()); return *_M_cur; } return *_M_path; } inline bool path::iterator::_M_equals(iterator __rhs) const { if (_M_path != __rhs._M_path) return false; if (_M_path == nullptr) return true; if (_M_path->_M_type() == path::_Type::_Multi) return _M_cur == __rhs._M_cur; return _M_at_end == __rhs._M_at_end; } // Define this now that path and path::iterator are complete. // It needs to consider the string_view(Range&&) constructor during // overload resolution, which depends on whether range<path> is satisfied, // which depends on whether path::iterator is complete. inline int path::_S_compare(const path& __lhs, const path& __rhs) noexcept { return __lhs.compare(__rhs); } /// @} group filesystem _GLIBCXX_END_NAMESPACE_CXX11 } // namespace filesystem /// @cond undocumented inline ptrdiff_t distance(filesystem::path::iterator __first, filesystem::path::iterator __last) { return __path_iter_distance(__first, __last); } template<typename _Distance> void advance(filesystem::path::iterator& __i, _Distance __n) { __path_iter_advance(__i, static_cast<ptrdiff_t>(__n)); } extern template class __shared_ptr<const filesystem::filesystem_error::_Impl>; /// @endcond // _GLIBCXX_RESOLVE_LIB_DEFECTS // 3657. std::hash<std::filesystem::path> is not enabled template<> struct hash<filesystem::path> { size_t operator()(const filesystem::path& __p) const noexcept { return filesystem::hash_value(__p); } }; _GLIBCXX_END_NAMESPACE_VERSION } // namespace std #endif // C++17 #endif // _GLIBCXX_FS_PATH_H
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