853 lines
24 KiB
C++
853 lines
24 KiB
C++
// Locale support -*- C++ -*-
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// Copyright (C) 1997-2016 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.h
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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_H
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#define _LOCALE_CLASSES_H 1
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#pragma GCC system_header
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#include <bits/localefwd.h>
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#include <string>
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#include <ext/atomicity.h>
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namespace std _GLIBCXX_VISIBILITY(default)
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{
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_GLIBCXX_BEGIN_NAMESPACE_VERSION
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// 22.1.1 Class locale
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/**
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* @brief Container class for localization functionality.
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* @ingroup locales
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*
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* The locale class is first a class wrapper for C library locales. It is
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* also an extensible container for user-defined localization. A locale is
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* a collection of facets that implement various localization features such
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* as money, time, and number printing.
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*
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* Constructing C++ locales does not change the C library locale.
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*
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* This library supports efficient construction and copying of locales
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* through a reference counting implementation of the locale class.
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*/
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class locale
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{
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public:
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// Types:
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/// Definition of locale::category.
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typedef int category;
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// Forward decls and friends:
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class facet;
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class id;
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class _Impl;
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friend class facet;
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friend class _Impl;
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template<typename _Facet>
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friend bool
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has_facet(const locale&) throw();
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template<typename _Facet>
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friend const _Facet&
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use_facet(const locale&);
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template<typename _Cache>
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friend struct __use_cache;
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//@{
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/**
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* @brief Category values.
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*
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* The standard category values are none, ctype, numeric, collate, time,
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* monetary, and messages. They form a bitmask that supports union and
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* intersection. The category all is the union of these values.
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*
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* NB: Order must match _S_facet_categories definition in locale.cc
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*/
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static const category none = 0;
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static const category ctype = 1L << 0;
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static const category numeric = 1L << 1;
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static const category collate = 1L << 2;
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static const category time = 1L << 3;
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static const category monetary = 1L << 4;
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static const category messages = 1L << 5;
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static const category all = (ctype | numeric | collate |
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time | monetary | messages);
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//@}
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// Construct/copy/destroy:
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/**
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* @brief Default constructor.
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*
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* Constructs a copy of the global locale. If no locale has been
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* explicitly set, this is the C locale.
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*/
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locale() throw();
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/**
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* @brief Copy constructor.
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*
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* Constructs a copy of @a other.
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*
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* @param __other The locale to copy.
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*/
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locale(const locale& __other) throw();
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/**
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* @brief Named locale constructor.
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*
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* Constructs a copy of the named C library locale.
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*
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* @param __s Name of the locale to construct.
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* @throw std::runtime_error if __s is null or an undefined locale.
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*/
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explicit
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locale(const char* __s);
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/**
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* @brief Construct locale with facets from another locale.
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*
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* Constructs a copy of the locale @a base. The facets specified by @a
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* cat are replaced with those from the locale named by @a s. If base is
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* named, this locale instance will also be named.
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*
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* @param __base The locale to copy.
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* @param __s Name of the locale to use facets from.
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* @param __cat Set of categories defining the facets to use from __s.
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* @throw std::runtime_error if __s is null or an undefined locale.
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*/
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locale(const locale& __base, const char* __s, category __cat);
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#if __cplusplus >= 201103L
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/**
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* @brief Named locale constructor.
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*
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* Constructs a copy of the named C library locale.
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*
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* @param __s Name of the locale to construct.
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* @throw std::runtime_error if __s is an undefined locale.
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*/
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explicit
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locale(const std::string& __s) : locale(__s.c_str()) { }
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/**
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* @brief Construct locale with facets from another locale.
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*
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* Constructs a copy of the locale @a base. The facets specified by @a
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* cat are replaced with those from the locale named by @a s. If base is
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* named, this locale instance will also be named.
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*
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* @param __base The locale to copy.
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* @param __s Name of the locale to use facets from.
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* @param __cat Set of categories defining the facets to use from __s.
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* @throw std::runtime_error if __s is an undefined locale.
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*/
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locale(const locale& __base, const std::string& __s, category __cat)
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: locale(__base, __s.c_str(), __cat) { }
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#endif
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/**
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* @brief Construct locale with facets from another locale.
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*
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* Constructs a copy of the locale @a base. The facets specified by @a
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* cat are replaced with those from the locale @a add. If @a base and @a
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* add are named, this locale instance will also be named.
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*
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* @param __base The locale to copy.
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* @param __add The locale to use facets from.
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* @param __cat Set of categories defining the facets to use from add.
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*/
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locale(const locale& __base, const locale& __add, category __cat);
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/**
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* @brief Construct locale with another facet.
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*
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* Constructs a copy of the locale @a __other. The facet @a __f
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* is added to @a __other, replacing an existing facet of type
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* Facet if there is one. If @a __f is null, this locale is a
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* copy of @a __other.
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*
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* @param __other The locale to copy.
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* @param __f The facet to add in.
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*/
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template<typename _Facet>
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locale(const locale& __other, _Facet* __f);
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/// Locale destructor.
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~locale() throw();
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/**
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* @brief Assignment operator.
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*
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* Set this locale to be a copy of @a other.
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*
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* @param __other The locale to copy.
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* @return A reference to this locale.
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*/
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const locale&
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operator=(const locale& __other) throw();
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/**
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* @brief Construct locale with another facet.
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*
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* Constructs and returns a new copy of this locale. Adds or replaces an
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* existing facet of type Facet from the locale @a other into the new
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* locale.
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*
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* @tparam _Facet The facet type to copy from other
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* @param __other The locale to copy from.
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* @return Newly constructed locale.
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* @throw std::runtime_error if __other has no facet of type _Facet.
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*/
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template<typename _Facet>
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locale
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combine(const locale& __other) const;
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// Locale operations:
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/**
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* @brief Return locale name.
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* @return Locale name or "*" if unnamed.
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*/
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_GLIBCXX_DEFAULT_ABI_TAG
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string
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name() const;
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/**
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* @brief Locale equality.
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*
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* @param __other The locale to compare against.
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* @return True if other and this refer to the same locale instance, are
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* copies, or have the same name. False otherwise.
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*/
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bool
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operator==(const locale& __other) const throw();
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/**
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* @brief Locale inequality.
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*
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* @param __other The locale to compare against.
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* @return ! (*this == __other)
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*/
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bool
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operator!=(const locale& __other) const throw()
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{ return !(this->operator==(__other)); }
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/**
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* @brief Compare two strings according to collate.
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*
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* Template operator to compare two strings using the compare function of
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* the collate facet in this locale. One use is to provide the locale to
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* the sort function. For example, a vector v of strings could be sorted
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* according to locale loc by doing:
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* @code
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* std::sort(v.begin(), v.end(), loc);
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* @endcode
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*
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* @param __s1 First string to compare.
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* @param __s2 Second string to compare.
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* @return True if collate<_Char> facet compares __s1 < __s2, else false.
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*/
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template<typename _Char, typename _Traits, typename _Alloc>
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bool
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operator()(const basic_string<_Char, _Traits, _Alloc>& __s1,
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const basic_string<_Char, _Traits, _Alloc>& __s2) const;
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// Global locale objects:
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/**
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* @brief Set global locale
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*
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* This function sets the global locale to the argument and returns a
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* copy of the previous global locale. If the argument has a name, it
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* will also call std::setlocale(LC_ALL, loc.name()).
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*
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* @param __loc The new locale to make global.
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* @return Copy of the old global locale.
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*/
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static locale
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global(const locale& __loc);
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/**
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* @brief Return reference to the C locale.
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*/
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static const locale&
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classic();
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private:
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// The (shared) implementation
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_Impl* _M_impl;
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// The "C" reference locale
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static _Impl* _S_classic;
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// Current global locale
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static _Impl* _S_global;
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// Names of underlying locale categories.
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// NB: locale::global() has to know how to modify all the
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// underlying categories, not just the ones required by the C++
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// standard.
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static const char* const* const _S_categories;
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// Number of standard categories. For C++, these categories are
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// collate, ctype, monetary, numeric, time, and messages. These
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// directly correspond to ISO C99 macros LC_COLLATE, LC_CTYPE,
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// LC_MONETARY, LC_NUMERIC, and LC_TIME. In addition, POSIX (IEEE
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// 1003.1-2001) specifies LC_MESSAGES.
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// In addition to the standard categories, the underlying
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// operating system is allowed to define extra LC_*
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// macros. For GNU systems, the following are also valid:
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// LC_PAPER, LC_NAME, LC_ADDRESS, LC_TELEPHONE, LC_MEASUREMENT,
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// and LC_IDENTIFICATION.
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enum { _S_categories_size = 6 + _GLIBCXX_NUM_CATEGORIES };
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#ifdef __GTHREADS
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static __gthread_once_t _S_once;
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#endif
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explicit
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locale(_Impl*) throw();
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static void
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_S_initialize();
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static void
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_S_initialize_once() throw();
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static category
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_S_normalize_category(category);
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void
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_M_coalesce(const locale& __base, const locale& __add, category __cat);
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#if _GLIBCXX_USE_CXX11_ABI
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static const id* const _S_twinned_facets[];
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#endif
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};
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// 22.1.1.1.2 Class locale::facet
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/**
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* @brief Localization functionality base class.
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* @ingroup locales
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*
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* The facet class is the base class for a localization feature, such as
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* money, time, and number printing. It provides common support for facets
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* and reference management.
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*
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* Facets may not be copied or assigned.
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*/
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class locale::facet
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{
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private:
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friend class locale;
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friend class locale::_Impl;
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mutable _Atomic_word _M_refcount;
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// Contains data from the underlying "C" library for the classic locale.
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static __c_locale _S_c_locale;
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// String literal for the name of the classic locale.
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static const char _S_c_name[2];
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#ifdef __GTHREADS
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static __gthread_once_t _S_once;
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#endif
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static void
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_S_initialize_once();
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protected:
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/**
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* @brief Facet constructor.
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*
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* This is the constructor provided by the standard. If refs is 0, the
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* facet is destroyed when the last referencing locale is destroyed.
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* Otherwise the facet will never be destroyed.
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*
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* @param __refs The initial value for reference count.
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*/
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explicit
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facet(size_t __refs = 0) throw() : _M_refcount(__refs ? 1 : 0)
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{ }
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/// Facet destructor.
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virtual
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~facet();
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static void
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_S_create_c_locale(__c_locale& __cloc, const char* __s,
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__c_locale __old = 0);
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static __c_locale
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_S_clone_c_locale(__c_locale& __cloc) throw();
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static void
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_S_destroy_c_locale(__c_locale& __cloc);
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static __c_locale
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_S_lc_ctype_c_locale(__c_locale __cloc, const char* __s);
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// Returns data from the underlying "C" library data for the
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// classic locale.
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static __c_locale
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_S_get_c_locale();
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_GLIBCXX_CONST static const char*
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_S_get_c_name() throw();
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#if __cplusplus < 201103L
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private:
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facet(const facet&); // Not defined.
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facet&
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operator=(const facet&); // Not defined.
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#else
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facet(const facet&) = delete;
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facet&
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operator=(const facet&) = delete;
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#endif
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private:
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void
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_M_add_reference() const throw()
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{ __gnu_cxx::__atomic_add_dispatch(&_M_refcount, 1); }
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void
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_M_remove_reference() const throw()
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{
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// Be race-detector-friendly. For more info see bits/c++config.
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_GLIBCXX_SYNCHRONIZATION_HAPPENS_BEFORE(&_M_refcount);
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if (__gnu_cxx::__exchange_and_add_dispatch(&_M_refcount, -1) == 1)
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{
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_GLIBCXX_SYNCHRONIZATION_HAPPENS_AFTER(&_M_refcount);
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__try
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{ delete this; }
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__catch(...)
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{ }
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}
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}
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class __shim;
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const facet* _M_sso_shim(const id*) const;
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const facet* _M_cow_shim(const id*) const;
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};
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// 22.1.1.1.3 Class locale::id
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/**
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* @brief Facet ID class.
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* @ingroup locales
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*
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* The ID class provides facets with an index used to identify them.
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* Every facet class must define a public static member locale::id, or be
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* derived from a facet that provides this member, otherwise the facet
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* cannot be used in a locale. The locale::id ensures that each class
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* type gets a unique identifier.
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*/
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class locale::id
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{
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private:
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friend class locale;
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friend class locale::_Impl;
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template<typename _Facet>
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friend const _Facet&
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use_facet(const locale&);
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template<typename _Facet>
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friend bool
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has_facet(const locale&) throw();
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// NB: There is no accessor for _M_index because it may be used
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// before the constructor is run; the effect of calling a member
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// function (even an inline) would be undefined.
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mutable size_t _M_index;
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// Last id number assigned.
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static _Atomic_word _S_refcount;
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void
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operator=(const id&); // Not defined.
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id(const id&); // Not defined.
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public:
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// NB: This class is always a static data member, and thus can be
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// counted on to be zero-initialized.
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/// Constructor.
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id() { }
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size_t
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_M_id() const throw();
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};
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// Implementation object for locale.
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class locale::_Impl
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{
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public:
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// Friends.
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friend class locale;
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friend class locale::facet;
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template<typename _Facet>
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friend bool
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has_facet(const locale&) throw();
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template<typename _Facet>
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friend const _Facet&
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use_facet(const locale&);
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template<typename _Cache>
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friend struct __use_cache;
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private:
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// Data Members.
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_Atomic_word _M_refcount;
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const facet** _M_facets;
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size_t _M_facets_size;
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const facet** _M_caches;
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char** _M_names;
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static const locale::id* const _S_id_ctype[];
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static const locale::id* const _S_id_numeric[];
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static const locale::id* const _S_id_collate[];
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static const locale::id* const _S_id_time[];
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static const locale::id* const _S_id_monetary[];
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static const locale::id* const _S_id_messages[];
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static const locale::id* const* const _S_facet_categories[];
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void
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_M_add_reference() throw()
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{ __gnu_cxx::__atomic_add_dispatch(&_M_refcount, 1); }
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void
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_M_remove_reference() throw()
|
|
{
|
|
// Be race-detector-friendly. For more info see bits/c++config.
|
|
_GLIBCXX_SYNCHRONIZATION_HAPPENS_BEFORE(&_M_refcount);
|
|
if (__gnu_cxx::__exchange_and_add_dispatch(&_M_refcount, -1) == 1)
|
|
{
|
|
_GLIBCXX_SYNCHRONIZATION_HAPPENS_AFTER(&_M_refcount);
|
|
__try
|
|
{ delete this; }
|
|
__catch(...)
|
|
{ }
|
|
}
|
|
}
|
|
|
|
_Impl(const _Impl&, size_t);
|
|
_Impl(const char*, size_t);
|
|
_Impl(size_t) throw();
|
|
|
|
~_Impl() throw();
|
|
|
|
_Impl(const _Impl&); // Not defined.
|
|
|
|
void
|
|
operator=(const _Impl&); // Not defined.
|
|
|
|
bool
|
|
_M_check_same_name()
|
|
{
|
|
bool __ret = true;
|
|
if (_M_names[1])
|
|
// We must actually compare all the _M_names: can be all equal!
|
|
for (size_t __i = 0; __ret && __i < _S_categories_size - 1; ++__i)
|
|
__ret = __builtin_strcmp(_M_names[__i], _M_names[__i + 1]) == 0;
|
|
return __ret;
|
|
}
|
|
|
|
void
|
|
_M_replace_categories(const _Impl*, category);
|
|
|
|
void
|
|
_M_replace_category(const _Impl*, const locale::id* const*);
|
|
|
|
void
|
|
_M_replace_facet(const _Impl*, const locale::id*);
|
|
|
|
void
|
|
_M_install_facet(const locale::id*, const facet*);
|
|
|
|
template<typename _Facet>
|
|
void
|
|
_M_init_facet(_Facet* __facet)
|
|
{ _M_install_facet(&_Facet::id, __facet); }
|
|
|
|
template<typename _Facet>
|
|
void
|
|
_M_init_facet_unchecked(_Facet* __facet)
|
|
{
|
|
__facet->_M_add_reference();
|
|
_M_facets[_Facet::id._M_id()] = __facet;
|
|
}
|
|
|
|
void
|
|
_M_install_cache(const facet*, size_t);
|
|
|
|
void _M_init_extra(facet**);
|
|
void _M_init_extra(void*, void*, const char*, const char*);
|
|
};
|
|
|
|
|
|
/**
|
|
* @brief Facet for localized string comparison.
|
|
*
|
|
* This facet encapsulates the code to compare strings in a localized
|
|
* manner.
|
|
*
|
|
* The collate template uses protected virtual functions to provide
|
|
* the actual results. The public accessors forward the call to
|
|
* the virtual functions. These virtual functions are hooks for
|
|
* developers to implement the behavior they require from the
|
|
* collate facet.
|
|
*/
|
|
template<typename _CharT>
|
|
class _GLIBCXX_NAMESPACE_CXX11 collate : public locale::facet
|
|
{
|
|
public:
|
|
// Types:
|
|
//@{
|
|
/// Public typedefs
|
|
typedef _CharT char_type;
|
|
typedef basic_string<_CharT> string_type;
|
|
//@}
|
|
|
|
protected:
|
|
// Underlying "C" library locale information saved from
|
|
// initialization, needed by collate_byname as well.
|
|
__c_locale _M_c_locale_collate;
|
|
|
|
public:
|
|
/// Numpunct facet id.
|
|
static locale::id id;
|
|
|
|
/**
|
|
* @brief Constructor performs initialization.
|
|
*
|
|
* This is the constructor provided by the standard.
|
|
*
|
|
* @param __refs Passed to the base facet class.
|
|
*/
|
|
explicit
|
|
collate(size_t __refs = 0)
|
|
: facet(__refs), _M_c_locale_collate(_S_get_c_locale())
|
|
{ }
|
|
|
|
/**
|
|
* @brief Internal constructor. Not for general use.
|
|
*
|
|
* This is a constructor for use by the library itself to set up new
|
|
* locales.
|
|
*
|
|
* @param __cloc The C locale.
|
|
* @param __refs Passed to the base facet class.
|
|
*/
|
|
explicit
|
|
collate(__c_locale __cloc, size_t __refs = 0)
|
|
: facet(__refs), _M_c_locale_collate(_S_clone_c_locale(__cloc))
|
|
{ }
|
|
|
|
/**
|
|
* @brief Compare two strings.
|
|
*
|
|
* This function compares two strings and returns the result by calling
|
|
* collate::do_compare().
|
|
*
|
|
* @param __lo1 Start of string 1.
|
|
* @param __hi1 End of string 1.
|
|
* @param __lo2 Start of string 2.
|
|
* @param __hi2 End of string 2.
|
|
* @return 1 if string1 > string2, -1 if string1 < string2, else 0.
|
|
*/
|
|
int
|
|
compare(const _CharT* __lo1, const _CharT* __hi1,
|
|
const _CharT* __lo2, const _CharT* __hi2) const
|
|
{ return this->do_compare(__lo1, __hi1, __lo2, __hi2); }
|
|
|
|
/**
|
|
* @brief Transform string to comparable form.
|
|
*
|
|
* This function is a wrapper for strxfrm functionality. It takes the
|
|
* input string and returns a modified string that can be directly
|
|
* compared to other transformed strings. In the C locale, this
|
|
* function just returns a copy of the input string. In some other
|
|
* locales, it may replace two chars with one, change a char for
|
|
* another, etc. It does so by returning collate::do_transform().
|
|
*
|
|
* @param __lo Start of string.
|
|
* @param __hi End of string.
|
|
* @return Transformed string_type.
|
|
*/
|
|
string_type
|
|
transform(const _CharT* __lo, const _CharT* __hi) const
|
|
{ return this->do_transform(__lo, __hi); }
|
|
|
|
/**
|
|
* @brief Return hash of a string.
|
|
*
|
|
* This function computes and returns a hash on the input string. It
|
|
* does so by returning collate::do_hash().
|
|
*
|
|
* @param __lo Start of string.
|
|
* @param __hi End of string.
|
|
* @return Hash value.
|
|
*/
|
|
long
|
|
hash(const _CharT* __lo, const _CharT* __hi) const
|
|
{ return this->do_hash(__lo, __hi); }
|
|
|
|
// Used to abstract out _CharT bits in virtual member functions, below.
|
|
int
|
|
_M_compare(const _CharT*, const _CharT*) const throw();
|
|
|
|
size_t
|
|
_M_transform(_CharT*, const _CharT*, size_t) const throw();
|
|
|
|
protected:
|
|
/// Destructor.
|
|
virtual
|
|
~collate()
|
|
{ _S_destroy_c_locale(_M_c_locale_collate); }
|
|
|
|
/**
|
|
* @brief Compare two strings.
|
|
*
|
|
* This function is a hook for derived classes to change the value
|
|
* returned. @see compare().
|
|
*
|
|
* @param __lo1 Start of string 1.
|
|
* @param __hi1 End of string 1.
|
|
* @param __lo2 Start of string 2.
|
|
* @param __hi2 End of string 2.
|
|
* @return 1 if string1 > string2, -1 if string1 < string2, else 0.
|
|
*/
|
|
virtual int
|
|
do_compare(const _CharT* __lo1, const _CharT* __hi1,
|
|
const _CharT* __lo2, const _CharT* __hi2) const;
|
|
|
|
/**
|
|
* @brief Transform string to comparable form.
|
|
*
|
|
* This function is a hook for derived classes to change the value
|
|
* returned.
|
|
*
|
|
* @param __lo Start.
|
|
* @param __hi End.
|
|
* @return transformed string.
|
|
*/
|
|
virtual string_type
|
|
do_transform(const _CharT* __lo, const _CharT* __hi) const;
|
|
|
|
/**
|
|
* @brief Return hash of a string.
|
|
*
|
|
* This function computes and returns a hash on the input string. This
|
|
* function is a hook for derived classes to change the value returned.
|
|
*
|
|
* @param __lo Start of string.
|
|
* @param __hi End of string.
|
|
* @return Hash value.
|
|
*/
|
|
virtual long
|
|
do_hash(const _CharT* __lo, const _CharT* __hi) const;
|
|
};
|
|
|
|
template<typename _CharT>
|
|
locale::id collate<_CharT>::id;
|
|
|
|
// Specializations.
|
|
template<>
|
|
int
|
|
collate<char>::_M_compare(const char*, const char*) const throw();
|
|
|
|
template<>
|
|
size_t
|
|
collate<char>::_M_transform(char*, const char*, size_t) const throw();
|
|
|
|
#ifdef _GLIBCXX_USE_WCHAR_T
|
|
template<>
|
|
int
|
|
collate<wchar_t>::_M_compare(const wchar_t*, const wchar_t*) const throw();
|
|
|
|
template<>
|
|
size_t
|
|
collate<wchar_t>::_M_transform(wchar_t*, const wchar_t*, size_t) const throw();
|
|
#endif
|
|
|
|
/// class collate_byname [22.2.4.2].
|
|
template<typename _CharT>
|
|
class _GLIBCXX_NAMESPACE_CXX11 collate_byname : public collate<_CharT>
|
|
{
|
|
public:
|
|
//@{
|
|
/// Public typedefs
|
|
typedef _CharT char_type;
|
|
typedef basic_string<_CharT> string_type;
|
|
//@}
|
|
|
|
explicit
|
|
collate_byname(const char* __s, size_t __refs = 0)
|
|
: collate<_CharT>(__refs)
|
|
{
|
|
if (__builtin_strcmp(__s, "C") != 0
|
|
&& __builtin_strcmp(__s, "POSIX") != 0)
|
|
{
|
|
this->_S_destroy_c_locale(this->_M_c_locale_collate);
|
|
this->_S_create_c_locale(this->_M_c_locale_collate, __s);
|
|
}
|
|
}
|
|
|
|
#if __cplusplus >= 201103L
|
|
explicit
|
|
collate_byname(const string& __s, size_t __refs = 0)
|
|
: collate_byname(__s.c_str(), __refs) { }
|
|
#endif
|
|
|
|
protected:
|
|
virtual
|
|
~collate_byname() { }
|
|
};
|
|
|
|
_GLIBCXX_END_NAMESPACE_VERSION
|
|
} // namespace
|
|
|
|
# include <bits/locale_classes.tcc>
|
|
|
|
#endif
|