Viewing file:  fs_path.h (41.29 KB) -rw-r--r--
Select action/file-type:
 (+) |  (+) |  (+) | Code (+) | Session (+) |  (+) | SDB (+) |  (+) |  (+) |  (+) |  (+) |  (+) |
// Class filesystem::path -*- C++ -*-
// Copyright (C) 2014-2022 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 <type_traits>
#include <locale>
#include <iosfwd>
#include <iomanip>
#include <codecvt>
#include <string_view>
#include <system_error>
#include <bits/stl_algobase.h>
#include <bits/stl_pair.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
#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>;
#if __cpp_lib_concepts
template<typename _Iter>
constexpr bool __is_contiguous = std::contiguous_iterator<_Iter>;
#else
template<typename _Iter>
constexpr bool __is_contiguous = false;
#endif
template<typename _Tp>
constexpr bool __is_contiguous<_Tp*> = true;
template<typename _Tp, typename _Seq>
constexpr bool
__is_contiguous<__gnu_cxx::__normal_iterator<_Tp*, _Seq>> = true;
#if !defined _GLIBCXX_FILESYSTEM_IS_WINDOWS && defined _GLIBCXX_USE_CHAR8_T
// For POSIX treat char8_t sequences as char without encoding conversions.
template<typename _EcharT>
using __unified_u8_t
= __conditional_t<is_same_v<_EcharT, char8_t>, char, _EcharT>;
#else
template<typename _EcharT>
using __unified_u8_t = _EcharT;
#endif
// The __effective_range overloads convert a Source parameter into
// either a basic_string_view<C> or basic_string<C> 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>
__effective_range(const basic_string<_CharT, _Traits, _Alloc>& __source)
noexcept
{ return __source; }
template<typename _CharT, typename _Traits>
inline basic_string_view<_CharT>
__effective_range(const basic_string_view<_CharT, _Traits>& __source)
noexcept
{ return __source; }
// Return the effective range of an NTCTS.
template<typename _Source>
auto
__effective_range(const _Source& __source)
{
// Remove a level of normal/safe iterator indirection, or decay an array.
using _Iter = decltype(std::__niter_base(__source));
using value_type = typename iterator_traits<_Iter>::value_type;
if constexpr (__is_contiguous<_Iter>)
return basic_string_view<value_type>{&*__source};
else
{
// _Source is an input iterator that iterates over an NTCTS.
// Create a basic_string by reading until the null character.
basic_string<__unified_u8_t<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 _Source>
struct __source_value_type_impl
{
using type
= typename __safe_iterator_traits<decay_t<_Source>>::value_type;
};
template<typename _CharT, typename _Traits, typename _Alloc>
struct __source_value_type_impl<basic_string<_CharT, _Traits, _Alloc>>
{
using type = _CharT;
};
template<typename _CharT, typename _Traits>
struct __source_value_type_impl<basic_string_view<_CharT, _Traits>>
{
using type = _CharT;
};
// The value type of a Source parameter's effective range.
template<typename _Source>
using __source_value_t = typename __source_value_type_impl<_Source>::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 = __source_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 = __source_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 basic_string<C> or basic_string_view<C> 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>); // C++17 [fs.req]/3
if constexpr (__is_contiguous<_InputIterator>)
{
// For contiguous iterators we can just return a string view.
if (auto __len = __last - __first) [[__likely__]]
return basic_string_view<_EcharT>(&*__first, __len);
return basic_string_view<_EcharT>();
}
else
{
// Conversion requires contiguous characters, so create a string.
return basic_string<__unified_u8_t<_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) noexcept
: _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 noexcept;
iterator end() const noexcept;
/// 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 basic_string<C> or
// basic_string_view<C>, for an encoded character type C,
// performing the conversions required by [fs.path.type.cvt].
template<typename _Tp>
static auto
_S_convert(_Tp __str)
noexcept(is_same_v<typename _Tp::value_type, value_type>)
{
if constexpr (is_same_v<typename _Tp::value_type, value_type>)
return __str; // No conversion needed.
#if !defined _GLIBCXX_FILESYSTEM_IS_WINDOWS && defined _GLIBCXX_USE_CHAR8_T
else if constexpr (is_same_v<_Tp, std::u8string>)
// Calling _S_convert<char8_t> will return a u8string_view that
// refers to __str and would dangle after this function returns.
// Return a string_type instead, to avoid dangling.
return string_type(_S_convert(__str.data(),
__str.data() + __str.size()));
#endif
else
return _S_convert(__str.data(), __str.data() + __str.size());
}
template<typename _EcharT>
static auto
_S_convert(const _EcharT* __first, const _EcharT* __last);
// _S_convert_loc converts a range of char to string_type, using the
// supplied locale for encoding conversions.
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
#if __cpp_concepts >= 201907L
// Workaround for PR libstdc++/106201
inline void
swap(same_as<path> auto& __lhs, same_as<path> auto& __rhs) noexcept
{ __lhs.swap(__rhs); }
#else
inline void swap(path& __lhs, path& __rhs) noexcept { __lhs.swap(__rhs); }
#endif
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() noexcept : _M_path(nullptr), _M_cur(), _M_at_end() { }
iterator(const iterator&) = default;
iterator& operator=(const iterator&) = default;
reference operator*() const noexcept;
pointer operator->() const noexcept { return std::__addressof(**this); }
iterator& operator++() noexcept;
iterator operator++(int) noexcept
{ auto __tmp = *this; ++*this; return __tmp; }
iterator& operator--() noexcept;
iterator operator--(int) noexcept
{ auto __tmp = *this; --*this; return __tmp; }
friend bool
operator==(const iterator& __lhs, const iterator& __rhs) noexcept
{ return __lhs._M_equals(__rhs); }
friend bool
operator!=(const iterator& __lhs, const iterator& __rhs) noexcept
{ return !__lhs._M_equals(__rhs); }
private:
friend class path;
bool
_M_is_multi() const noexcept
{ return _M_path->_M_type() == _Type::_Multi; }
friend difference_type
__path_iter_distance(const iterator& __first, const iterator& __last)
noexcept
{
__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) noexcept
{
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) noexcept
: _M_path(__path), _M_cur(__iter), _M_at_end()
{ }
iterator(const path* __path, bool __at_end) noexcept
: _M_path(__path), _M_cur(), _M_at_end(__at_end)
{ }
bool _M_equals(iterator) const noexcept;
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
auto __pos = _M_pathname.find(L'/');
while (__pos != _M_pathname.npos)
{
_M_pathname[__pos] = preferred_separator;
__pos = _M_pathname.find(L'/', __pos);
}
#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 noexcept
{
if (_M_type() == _Type::_Multi)
return iterator(this, _M_cmpts.begin());
return iterator(this, empty());
}
inline path::iterator
path::end() const noexcept
{
if (_M_type() == _Type::_Multi)
return iterator(this, _M_cmpts.end());
return iterator(this, true);
}
inline path::iterator&
path::iterator::operator++() noexcept
{
__glibcxx_assert(_M_path != nullptr);
if (_M_is_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--() noexcept
{
__glibcxx_assert(_M_path != nullptr);
if (_M_is_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 noexcept
{
__glibcxx_assert(_M_path != nullptr);
if (_M_is_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 noexcept
{
if (_M_path != __rhs._M_path)
return false;
if (_M_path == nullptr)
return true;
if (_M_is_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)
noexcept
{ return __path_iter_distance(__first, __last); }
template<typename _Distance>
inline void
advance(filesystem::path::iterator& __i, _Distance __n) noexcept
{ __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
|
