| 1 |
// Locale support -*- C++ -*- |
| 2 |
|
| 3 |
// Copyright (C) 2007-2021 Free Software Foundation, Inc. |
| 4 |
// |
| 5 |
// This file is part of the GNU ISO C++ Library. This library is free |
| 6 |
// software; you can redistribute it and/or modify it under the |
| 7 |
// terms of the GNU General Public License as published by the |
| 8 |
// Free Software Foundation; either version 3, or (at your option) |
| 9 |
// any later version. |
| 10 |
|
| 11 |
// This library is distributed in the hope that it will be useful, |
| 12 |
// but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 |
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 |
// GNU General Public License for more details. |
| 15 |
|
| 16 |
// Under Section 7 of GPL version 3, you are granted additional |
| 17 |
// permissions described in the GCC Runtime Library Exception, version |
| 18 |
// 3.1, as published by the Free Software Foundation. |
| 19 |
|
| 20 |
// You should have received a copy of the GNU General Public License and |
| 21 |
// a copy of the GCC Runtime Library Exception along with this program; |
| 22 |
// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see |
| 23 |
// <http://www.gnu.org/licenses/>. |
| 24 |
|
| 25 |
/** @file bits/locale_classes.tcc |
| 26 |
* This is an internal header file, included by other library headers. |
| 27 |
* Do not attempt to use it directly. @headername{locale} |
| 28 |
*/ |
| 29 |
|
| 30 |
// |
| 31 |
// ISO C++ 14882: 22.1 Locales |
| 32 |
// |
| 33 |
|
| 34 |
#ifndef _LOCALE_CLASSES_TCC |
| 35 |
#define _LOCALE_CLASSES_TCC 1 |
| 36 |
|
| 37 |
#pragma GCC system_header |
| 38 |
|
| 39 |
namespace std _GLIBCXX_VISIBILITY(default) |
| 40 |
{ |
| 41 |
_GLIBCXX_BEGIN_NAMESPACE_VERSION |
| 42 |
|
| 43 |
template<typename _Facet> |
| 44 |
locale:: |
| 45 |
locale(const locale& __other, _Facet* __f) |
| 46 |
{ |
| 47 |
_M_impl = new _Impl(*__other._M_impl, 1); |
| 48 |
|
| 49 |
__try |
| 50 |
{ _M_impl->_M_install_facet(&_Facet::id, __f); } |
| 51 |
__catch(...) |
| 52 |
{ |
| 53 |
_M_impl->_M_remove_reference(); |
| 54 |
__throw_exception_again; |
| 55 |
} |
| 56 |
delete [] _M_impl->_M_names[0]; |
| 57 |
_M_impl->_M_names[0] = 0; // Unnamed. |
| 58 |
} |
| 59 |
|
| 60 |
template<typename _Facet> |
| 61 |
locale |
| 62 |
locale:: |
| 63 |
combine(const locale& __other) const |
| 64 |
{ |
| 65 |
_Impl* __tmp = new _Impl(*_M_impl, 1); |
| 66 |
__try |
| 67 |
{ |
| 68 |
__tmp->_M_replace_facet(__other._M_impl, &_Facet::id); |
| 69 |
} |
| 70 |
__catch(...) |
| 71 |
{ |
| 72 |
__tmp->_M_remove_reference(); |
| 73 |
__throw_exception_again; |
| 74 |
} |
| 75 |
return locale(__tmp); |
| 76 |
} |
| 77 |
|
| 78 |
template<typename _CharT, typename _Traits, typename _Alloc> |
| 79 |
bool |
| 80 |
locale:: |
| 81 |
operator()(const basic_string<_CharT, _Traits, _Alloc>& __s1, |
| 82 |
const basic_string<_CharT, _Traits, _Alloc>& __s2) const |
| 83 |
{ |
| 84 |
typedef std::collate<_CharT> __collate_type; |
| 85 |
const __collate_type& __collate = use_facet<__collate_type>(*this); |
| 86 |
return (__collate.compare(__s1.data(), __s1.data() + __s1.length(), |
| 87 |
__s2.data(), __s2.data() + __s2.length()) < 0); |
| 88 |
} |
| 89 |
|
| 90 |
/** |
| 91 |
* @brief Test for the presence of a facet. |
| 92 |
* @ingroup locales |
| 93 |
* |
| 94 |
* has_facet tests the locale argument for the presence of the facet type |
| 95 |
* provided as the template parameter. Facets derived from the facet |
| 96 |
* parameter will also return true. |
| 97 |
* |
| 98 |
* @tparam _Facet The facet type to test the presence of. |
| 99 |
* @param __loc The locale to test. |
| 100 |
* @return true if @p __loc contains a facet of type _Facet, else false. |
| 101 |
*/ |
| 102 |
template<typename _Facet> |
| 103 |
bool |
| 104 |
has_facet(const locale& __loc) throw() |
| 105 |
{ |
| 106 |
const size_t __i = _Facet::id._M_id(); |
| 107 |
const locale::facet** __facets = __loc._M_impl->_M_facets; |
| 108 |
return (__i < __loc._M_impl->_M_facets_size |
| 109 |
#if __cpp_rtti |
| 110 |
&& dynamic_cast<const _Facet*>(__facets[__i])); |
| 111 |
#else |
| 112 |
&& static_cast<const _Facet*>(__facets[__i])); |
| 113 |
#endif |
| 114 |
} |
| 115 |
|
| 116 |
/** |
| 117 |
* @brief Return a facet. |
| 118 |
* @ingroup locales |
| 119 |
* |
| 120 |
* use_facet looks for and returns a reference to a facet of type Facet |
| 121 |
* where Facet is the template parameter. If has_facet(locale) is true, |
| 122 |
* there is a suitable facet to return. It throws std::bad_cast if the |
| 123 |
* locale doesn't contain a facet of type Facet. |
| 124 |
* |
| 125 |
* @tparam _Facet The facet type to access. |
| 126 |
* @param __loc The locale to use. |
| 127 |
* @return Reference to facet of type Facet. |
| 128 |
* @throw std::bad_cast if @p __loc doesn't contain a facet of type _Facet. |
| 129 |
*/ |
| 130 |
template<typename _Facet> |
| 131 |
const _Facet& |
| 132 |
use_facet(const locale& __loc) |
| 133 |
{ |
| 134 |
const size_t __i = _Facet::id._M_id(); |
| 135 |
const locale::facet** __facets = __loc._M_impl->_M_facets; |
| 136 |
if (__i >= __loc._M_impl->_M_facets_size || !__facets[__i]) |
| 137 |
__throw_bad_cast(); |
| 138 |
#if __cpp_rtti |
| 139 |
return dynamic_cast<const _Facet&>(*__facets[__i]); |
| 140 |
#else |
| 141 |
return static_cast<const _Facet&>(*__facets[__i]); |
| 142 |
#endif |
| 143 |
} |
| 144 |
|
| 145 |
|
| 146 |
// Generic version does nothing. |
| 147 |
template<typename _CharT> |
| 148 |
int |
| 149 |
collate<_CharT>::_M_compare(const _CharT*, const _CharT*) const throw () |
| 150 |
{ return 0; } |
| 151 |
|
| 152 |
// Generic version does nothing. |
| 153 |
template<typename _CharT> |
| 154 |
size_t |
| 155 |
collate<_CharT>::_M_transform(_CharT*, const _CharT*, size_t) const throw () |
| 156 |
{ return 0; } |
| 157 |
|
| 158 |
template<typename _CharT> |
| 159 |
int |
| 160 |
collate<_CharT>:: |
| 161 |
do_compare(const _CharT* __lo1, const _CharT* __hi1, |
| 162 |
const _CharT* __lo2, const _CharT* __hi2) const |
| 163 |
{ |
| 164 |
// strcoll assumes zero-terminated strings so we make a copy |
| 165 |
// and then put a zero at the end. |
| 166 |
const string_type __one(__lo1, __hi1); |
| 167 |
const string_type __two(__lo2, __hi2); |
| 168 |
|
| 169 |
const _CharT* __p = __one.c_str(); |
| 170 |
const _CharT* __pend = __one.data() + __one.length(); |
| 171 |
const _CharT* __q = __two.c_str(); |
| 172 |
const _CharT* __qend = __two.data() + __two.length(); |
| 173 |
|
| 174 |
// strcoll stops when it sees a nul character so we break |
| 175 |
// the strings into zero-terminated substrings and pass those |
| 176 |
// to strcoll. |
| 177 |
for (;;) |
| 178 |
{ |
| 179 |
const int __res = _M_compare(__p, __q); |
| 180 |
if (__res) |
| 181 |
return __res; |
| 182 |
|
| 183 |
__p += char_traits<_CharT>::length(__p); |
| 184 |
__q += char_traits<_CharT>::length(__q); |
| 185 |
if (__p == __pend && __q == __qend) |
| 186 |
return 0; |
| 187 |
else if (__p == __pend) |
| 188 |
return -1; |
| 189 |
else if (__q == __qend) |
| 190 |
return 1; |
| 191 |
|
| 192 |
__p++; |
| 193 |
__q++; |
| 194 |
} |
| 195 |
} |
| 196 |
|
| 197 |
template<typename _CharT> |
| 198 |
typename collate<_CharT>::string_type |
| 199 |
collate<_CharT>:: |
| 200 |
do_transform(const _CharT* __lo, const _CharT* __hi) const |
| 201 |
{ |
| 202 |
string_type __ret; |
| 203 |
|
| 204 |
// strxfrm assumes zero-terminated strings so we make a copy |
| 205 |
const string_type __str(__lo, __hi); |
| 206 |
|
| 207 |
const _CharT* __p = __str.c_str(); |
| 208 |
const _CharT* __pend = __str.data() + __str.length(); |
| 209 |
|
| 210 |
size_t __len = (__hi - __lo) * 2; |
| 211 |
|
| 212 |
_CharT* __c = new _CharT[__len]; |
| 213 |
|
| 214 |
__try |
| 215 |
{ |
| 216 |
// strxfrm stops when it sees a nul character so we break |
| 217 |
// the string into zero-terminated substrings and pass those |
| 218 |
// to strxfrm. |
| 219 |
for (;;) |
| 220 |
{ |
| 221 |
// First try a buffer perhaps big enough. |
| 222 |
size_t __res = _M_transform(__c, __p, __len); |
| 223 |
// If the buffer was not large enough, try again with the |
| 224 |
// correct size. |
| 225 |
if (__res >= __len) |
| 226 |
{ |
| 227 |
__len = __res + 1; |
| 228 |
delete [] __c, __c = 0; |
| 229 |
__c = new _CharT[__len]; |
| 230 |
__res = _M_transform(__c, __p, __len); |
| 231 |
} |
| 232 |
|
| 233 |
__ret.append(__c, __res); |
| 234 |
__p += char_traits<_CharT>::length(__p); |
| 235 |
if (__p == __pend) |
| 236 |
break; |
| 237 |
|
| 238 |
__p++; |
| 239 |
__ret.push_back(_CharT()); |
| 240 |
} |
| 241 |
} |
| 242 |
__catch(...) |
| 243 |
{ |
| 244 |
delete [] __c; |
| 245 |
__throw_exception_again; |
| 246 |
} |
| 247 |
|
| 248 |
delete [] __c; |
| 249 |
|
| 250 |
return __ret; |
| 251 |
} |
| 252 |
|
| 253 |
template<typename _CharT> |
| 254 |
long |
| 255 |
collate<_CharT>:: |
| 256 |
do_hash(const _CharT* __lo, const _CharT* __hi) const |
| 257 |
{ |
| 258 |
unsigned long __val = 0; |
| 259 |
for (; __lo < __hi; ++__lo) |
| 260 |
__val = |
| 261 |
*__lo + ((__val << 7) |
| 262 |
| (__val >> (__gnu_cxx::__numeric_traits<unsigned long>:: |
| 263 |
__digits - 7))); |
| 264 |
return static_cast<long>(__val); |
| 265 |
} |
| 266 |
|
| 267 |
// Inhibit implicit instantiations for required instantiations, |
| 268 |
// which are defined via explicit instantiations elsewhere. |
| 269 |
#if _GLIBCXX_EXTERN_TEMPLATE |
| 270 |
extern template class collate<char>; |
| 271 |
extern template class collate_byname<char>; |
| 272 |
|
| 273 |
extern template |
| 274 |
const collate<char>& |
| 275 |
use_facet<collate<char> >(const locale&); |
| 276 |
|
| 277 |
extern template |
| 278 |
bool |
| 279 |
has_facet<collate<char> >(const locale&); |
| 280 |
|
| 281 |
#ifdef _GLIBCXX_USE_WCHAR_T |
| 282 |
extern template class collate<wchar_t>; |
| 283 |
extern template class collate_byname<wchar_t>; |
| 284 |
|
| 285 |
extern template |
| 286 |
const collate<wchar_t>& |
| 287 |
use_facet<collate<wchar_t> >(const locale&); |
| 288 |
|
| 289 |
extern template |
| 290 |
bool |
| 291 |
has_facet<collate<wchar_t> >(const locale&); |
| 292 |
#endif |
| 293 |
#endif |
| 294 |
|
| 295 |
_GLIBCXX_END_NAMESPACE_VERSION |
| 296 |
} // namespace std |
| 297 |
|
| 298 |
#endif |
