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299 lines
8.2 KiB
299 lines
8.2 KiB
// Locale support -*- C++ -*-
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// Copyright (C) 2007-2021 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 bits/locale_classes.tcc
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* This is an internal header file, included by other library headers.
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* Do not attempt to use it directly. @headername{locale}
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*/
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//
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// ISO C++ 14882: 22.1 Locales
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//
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#ifndef _LOCALE_CLASSES_TCC
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#define _LOCALE_CLASSES_TCC 1
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#pragma GCC system_header
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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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template<typename _Facet>
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locale::
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locale(const locale& __other, _Facet* __f)
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{
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_M_impl = new _Impl(*__other._M_impl, 1);
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__try
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{ _M_impl->_M_install_facet(&_Facet::id, __f); }
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__catch(...)
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{
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_M_impl->_M_remove_reference();
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__throw_exception_again;
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}
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delete [] _M_impl->_M_names[0];
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_M_impl->_M_names[0] = 0; // Unnamed.
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}
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template<typename _Facet>
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locale
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locale::
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combine(const locale& __other) const
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{
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_Impl* __tmp = new _Impl(*_M_impl, 1);
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__try
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{
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__tmp->_M_replace_facet(__other._M_impl, &_Facet::id);
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}
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__catch(...)
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{
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__tmp->_M_remove_reference();
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__throw_exception_again;
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}
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return locale(__tmp);
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}
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template<typename _CharT, typename _Traits, typename _Alloc>
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bool
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locale::
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operator()(const basic_string<_CharT, _Traits, _Alloc>& __s1,
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const basic_string<_CharT, _Traits, _Alloc>& __s2) const
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{
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typedef std::collate<_CharT> __collate_type;
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const __collate_type& __collate = use_facet<__collate_type>(*this);
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return (__collate.compare(__s1.data(), __s1.data() + __s1.length(),
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__s2.data(), __s2.data() + __s2.length()) < 0);
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}
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/**
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* @brief Test for the presence of a facet.
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* @ingroup locales
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*
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* has_facet tests the locale argument for the presence of the facet type
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* provided as the template parameter. Facets derived from the facet
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* parameter will also return true.
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*
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* @tparam _Facet The facet type to test the presence of.
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* @param __loc The locale to test.
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* @return true if @p __loc contains a facet of type _Facet, else false.
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*/
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template<typename _Facet>
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bool
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has_facet(const locale& __loc) throw()
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{
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const size_t __i = _Facet::id._M_id();
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const locale::facet** __facets = __loc._M_impl->_M_facets;
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return (__i < __loc._M_impl->_M_facets_size
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#if __cpp_rtti
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&& dynamic_cast<const _Facet*>(__facets[__i]));
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#else
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&& static_cast<const _Facet*>(__facets[__i]));
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#endif
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}
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/**
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* @brief Return a facet.
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* @ingroup locales
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*
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* use_facet looks for and returns a reference to a facet of type Facet
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* where Facet is the template parameter. If has_facet(locale) is true,
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* there is a suitable facet to return. It throws std::bad_cast if the
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* locale doesn't contain a facet of type Facet.
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*
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* @tparam _Facet The facet type to access.
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* @param __loc The locale to use.
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* @return Reference to facet of type Facet.
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* @throw std::bad_cast if @p __loc doesn't contain a facet of type _Facet.
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*/
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template<typename _Facet>
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const _Facet&
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use_facet(const locale& __loc)
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{
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const size_t __i = _Facet::id._M_id();
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const locale::facet** __facets = __loc._M_impl->_M_facets;
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if (__i >= __loc._M_impl->_M_facets_size || !__facets[__i])
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__throw_bad_cast();
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#if __cpp_rtti
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return dynamic_cast<const _Facet&>(*__facets[__i]);
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#else
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return static_cast<const _Facet&>(*__facets[__i]);
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#endif
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}
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// Generic version does nothing.
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template<typename _CharT>
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int
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collate<_CharT>::_M_compare(const _CharT*, const _CharT*) const throw ()
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{ return 0; }
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// Generic version does nothing.
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template<typename _CharT>
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size_t
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collate<_CharT>::_M_transform(_CharT*, const _CharT*, size_t) const throw ()
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{ return 0; }
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template<typename _CharT>
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int
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collate<_CharT>::
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do_compare(const _CharT* __lo1, const _CharT* __hi1,
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const _CharT* __lo2, const _CharT* __hi2) const
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{
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// strcoll assumes zero-terminated strings so we make a copy
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// and then put a zero at the end.
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const string_type __one(__lo1, __hi1);
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const string_type __two(__lo2, __hi2);
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const _CharT* __p = __one.c_str();
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const _CharT* __pend = __one.data() + __one.length();
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const _CharT* __q = __two.c_str();
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const _CharT* __qend = __two.data() + __two.length();
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// strcoll stops when it sees a nul character so we break
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// the strings into zero-terminated substrings and pass those
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// to strcoll.
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for (;;)
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{
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const int __res = _M_compare(__p, __q);
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if (__res)
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return __res;
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__p += char_traits<_CharT>::length(__p);
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__q += char_traits<_CharT>::length(__q);
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if (__p == __pend && __q == __qend)
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return 0;
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else if (__p == __pend)
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return -1;
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else if (__q == __qend)
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return 1;
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__p++;
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__q++;
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}
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}
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template<typename _CharT>
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typename collate<_CharT>::string_type
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collate<_CharT>::
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do_transform(const _CharT* __lo, const _CharT* __hi) const
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{
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string_type __ret;
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// strxfrm assumes zero-terminated strings so we make a copy
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const string_type __str(__lo, __hi);
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const _CharT* __p = __str.c_str();
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const _CharT* __pend = __str.data() + __str.length();
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size_t __len = (__hi - __lo) * 2;
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_CharT* __c = new _CharT[__len];
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__try
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{
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// strxfrm stops when it sees a nul character so we break
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// the string into zero-terminated substrings and pass those
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// to strxfrm.
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for (;;)
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{
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// First try a buffer perhaps big enough.
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size_t __res = _M_transform(__c, __p, __len);
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// If the buffer was not large enough, try again with the
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// correct size.
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if (__res >= __len)
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{
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__len = __res + 1;
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delete [] __c, __c = 0;
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__c = new _CharT[__len];
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__res = _M_transform(__c, __p, __len);
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}
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__ret.append(__c, __res);
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__p += char_traits<_CharT>::length(__p);
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if (__p == __pend)
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break;
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__p++;
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__ret.push_back(_CharT());
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}
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}
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__catch(...)
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{
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delete [] __c;
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__throw_exception_again;
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}
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delete [] __c;
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return __ret;
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}
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template<typename _CharT>
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long
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collate<_CharT>::
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do_hash(const _CharT* __lo, const _CharT* __hi) const
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{
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unsigned long __val = 0;
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for (; __lo < __hi; ++__lo)
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__val =
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*__lo + ((__val << 7)
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| (__val >> (__gnu_cxx::__numeric_traits<unsigned long>::
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__digits - 7)));
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return static_cast<long>(__val);
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}
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// Inhibit implicit instantiations for required instantiations,
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// which are defined via explicit instantiations elsewhere.
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#if _GLIBCXX_EXTERN_TEMPLATE
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extern template class collate<char>;
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extern template class collate_byname<char>;
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extern template
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const collate<char>&
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use_facet<collate<char> >(const locale&);
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extern template
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bool
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has_facet<collate<char> >(const locale&);
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#ifdef _GLIBCXX_USE_WCHAR_T
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extern template class collate<wchar_t>;
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extern template class collate_byname<wchar_t>;
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extern template
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const collate<wchar_t>&
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use_facet<collate<wchar_t> >(const locale&);
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extern template
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bool
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has_facet<collate<wchar_t> >(const locale&);
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#endif
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#endif
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_GLIBCXX_END_NAMESPACE_VERSION
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} // namespace std
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#endif
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