508 lines
16 KiB
C++
508 lines
16 KiB
C++
// Locale support (codecvt) -*- C++ -*-
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// Copyright (C) 2000-2013 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/codecvt.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: 22.2.1.5 Template class codecvt
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//
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// Written by Benjamin Kosnik <bkoz@redhat.com>
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#ifndef _CODECVT_H
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#define _CODECVT_H 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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/// Empty base class for codecvt facet [22.2.1.5].
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class codecvt_base
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{
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public:
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enum result
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{
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ok,
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partial,
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error,
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noconv
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};
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};
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/**
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* @brief Common base for codecvt functions.
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*
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* This template class provides implementations of the public functions
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* that forward to the protected virtual functions.
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*
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* This template also provides abstract stubs for the protected virtual
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* functions.
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*/
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template<typename _InternT, typename _ExternT, typename _StateT>
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class __codecvt_abstract_base
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: public locale::facet, public codecvt_base
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{
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public:
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// Types:
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typedef codecvt_base::result result;
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typedef _InternT intern_type;
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typedef _ExternT extern_type;
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typedef _StateT state_type;
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// 22.2.1.5.1 codecvt members
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/**
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* @brief Convert from internal to external character set.
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*
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* Converts input string of intern_type to output string of
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* extern_type. This is analogous to wcsrtombs. It does this by
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* calling codecvt::do_out.
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*
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* The source and destination character sets are determined by the
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* facet's locale, internal and external types.
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*
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* The characters in [from,from_end) are converted and written to
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* [to,to_end). from_next and to_next are set to point to the
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* character following the last successfully converted character,
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* respectively. If the result needed no conversion, from_next and
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* to_next are not affected.
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*
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* The @a state argument should be initialized if the input is at the
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* beginning and carried from a previous call if continuing
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* conversion. There are no guarantees about how @a state is used.
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*
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* The result returned is a member of codecvt_base::result. If
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* all the input is converted, returns codecvt_base::ok. If no
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* conversion is necessary, returns codecvt_base::noconv. If
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* the input ends early or there is insufficient space in the
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* output, returns codecvt_base::partial. Otherwise the
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* conversion failed and codecvt_base::error is returned.
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*
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* @param __state Persistent conversion state data.
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* @param __from Start of input.
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* @param __from_end End of input.
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* @param __from_next Returns start of unconverted data.
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* @param __to Start of output buffer.
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* @param __to_end End of output buffer.
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* @param __to_next Returns start of unused output area.
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* @return codecvt_base::result.
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*/
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result
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out(state_type& __state, const intern_type* __from,
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const intern_type* __from_end, const intern_type*& __from_next,
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extern_type* __to, extern_type* __to_end,
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extern_type*& __to_next) const
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{
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return this->do_out(__state, __from, __from_end, __from_next,
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__to, __to_end, __to_next);
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}
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/**
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* @brief Reset conversion state.
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*
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* Writes characters to output that would restore @a state to initial
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* conditions. The idea is that if a partial conversion occurs, then
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* the converting the characters written by this function would leave
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* the state in initial conditions, rather than partial conversion
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* state. It does this by calling codecvt::do_unshift().
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*
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* For example, if 4 external characters always converted to 1 internal
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* character, and input to in() had 6 external characters with state
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* saved, this function would write two characters to the output and
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* set the state to initialized conditions.
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*
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* The source and destination character sets are determined by the
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* facet's locale, internal and external types.
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*
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* The result returned is a member of codecvt_base::result. If the
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* state could be reset and data written, returns codecvt_base::ok. If
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* no conversion is necessary, returns codecvt_base::noconv. If the
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* output has insufficient space, returns codecvt_base::partial.
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* Otherwise the reset failed and codecvt_base::error is returned.
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*
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* @param __state Persistent conversion state data.
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* @param __to Start of output buffer.
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* @param __to_end End of output buffer.
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* @param __to_next Returns start of unused output area.
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* @return codecvt_base::result.
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*/
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result
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unshift(state_type& __state, extern_type* __to, extern_type* __to_end,
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extern_type*& __to_next) const
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{ return this->do_unshift(__state, __to,__to_end,__to_next); }
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/**
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* @brief Convert from external to internal character set.
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*
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* Converts input string of extern_type to output string of
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* intern_type. This is analogous to mbsrtowcs. It does this by
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* calling codecvt::do_in.
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*
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* The source and destination character sets are determined by the
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* facet's locale, internal and external types.
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*
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* The characters in [from,from_end) are converted and written to
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* [to,to_end). from_next and to_next are set to point to the
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* character following the last successfully converted character,
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* respectively. If the result needed no conversion, from_next and
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* to_next are not affected.
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*
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* The @a state argument should be initialized if the input is at the
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* beginning and carried from a previous call if continuing
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* conversion. There are no guarantees about how @a state is used.
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*
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* The result returned is a member of codecvt_base::result. If
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* all the input is converted, returns codecvt_base::ok. If no
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* conversion is necessary, returns codecvt_base::noconv. If
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* the input ends early or there is insufficient space in the
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* output, returns codecvt_base::partial. Otherwise the
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* conversion failed and codecvt_base::error is returned.
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*
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* @param __state Persistent conversion state data.
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* @param __from Start of input.
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* @param __from_end End of input.
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* @param __from_next Returns start of unconverted data.
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* @param __to Start of output buffer.
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* @param __to_end End of output buffer.
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* @param __to_next Returns start of unused output area.
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* @return codecvt_base::result.
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*/
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result
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in(state_type& __state, const extern_type* __from,
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const extern_type* __from_end, const extern_type*& __from_next,
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intern_type* __to, intern_type* __to_end,
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intern_type*& __to_next) const
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{
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return this->do_in(__state, __from, __from_end, __from_next,
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__to, __to_end, __to_next);
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}
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int
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encoding() const throw()
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{ return this->do_encoding(); }
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bool
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always_noconv() const throw()
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{ return this->do_always_noconv(); }
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int
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length(state_type& __state, const extern_type* __from,
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const extern_type* __end, size_t __max) const
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{ return this->do_length(__state, __from, __end, __max); }
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int
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max_length() const throw()
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{ return this->do_max_length(); }
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protected:
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explicit
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__codecvt_abstract_base(size_t __refs = 0) : locale::facet(__refs) { }
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virtual
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~__codecvt_abstract_base() { }
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/**
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* @brief Convert from internal to external character set.
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*
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* Converts input string of intern_type to output string of
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* extern_type. This function is a hook for derived classes to change
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* the value returned. @see out for more information.
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*/
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virtual result
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do_out(state_type& __state, const intern_type* __from,
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const intern_type* __from_end, const intern_type*& __from_next,
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extern_type* __to, extern_type* __to_end,
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extern_type*& __to_next) const = 0;
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virtual result
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do_unshift(state_type& __state, extern_type* __to,
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extern_type* __to_end, extern_type*& __to_next) const = 0;
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virtual result
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do_in(state_type& __state, const extern_type* __from,
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const extern_type* __from_end, const extern_type*& __from_next,
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intern_type* __to, intern_type* __to_end,
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intern_type*& __to_next) const = 0;
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virtual int
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do_encoding() const throw() = 0;
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virtual bool
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do_always_noconv() const throw() = 0;
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virtual int
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do_length(state_type&, const extern_type* __from,
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const extern_type* __end, size_t __max) const = 0;
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virtual int
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do_max_length() const throw() = 0;
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};
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/**
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* @brief Primary class template codecvt.
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* @ingroup locales
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*
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* NB: Generic, mostly useless implementation.
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*
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*/
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template<typename _InternT, typename _ExternT, typename _StateT>
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class codecvt
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: public __codecvt_abstract_base<_InternT, _ExternT, _StateT>
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{
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public:
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// Types:
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typedef codecvt_base::result result;
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typedef _InternT intern_type;
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typedef _ExternT extern_type;
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typedef _StateT state_type;
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protected:
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__c_locale _M_c_locale_codecvt;
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public:
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static locale::id id;
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explicit
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codecvt(size_t __refs = 0)
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: __codecvt_abstract_base<_InternT, _ExternT, _StateT> (__refs),
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_M_c_locale_codecvt(0)
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{ }
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explicit
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codecvt(__c_locale __cloc, size_t __refs = 0);
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protected:
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virtual
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~codecvt() { }
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virtual result
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do_out(state_type& __state, const intern_type* __from,
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const intern_type* __from_end, const intern_type*& __from_next,
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extern_type* __to, extern_type* __to_end,
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extern_type*& __to_next) const;
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virtual result
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do_unshift(state_type& __state, extern_type* __to,
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extern_type* __to_end, extern_type*& __to_next) const;
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virtual result
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do_in(state_type& __state, const extern_type* __from,
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const extern_type* __from_end, const extern_type*& __from_next,
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intern_type* __to, intern_type* __to_end,
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intern_type*& __to_next) const;
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virtual int
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do_encoding() const throw();
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virtual bool
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do_always_noconv() const throw();
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virtual int
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do_length(state_type&, const extern_type* __from,
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const extern_type* __end, size_t __max) const;
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virtual int
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do_max_length() const throw();
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};
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template<typename _InternT, typename _ExternT, typename _StateT>
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locale::id codecvt<_InternT, _ExternT, _StateT>::id;
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/// class codecvt<char, char, mbstate_t> specialization.
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template<>
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class codecvt<char, char, mbstate_t>
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: public __codecvt_abstract_base<char, char, mbstate_t>
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{
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public:
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// Types:
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typedef char intern_type;
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typedef char extern_type;
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typedef mbstate_t state_type;
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protected:
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__c_locale _M_c_locale_codecvt;
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public:
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static locale::id id;
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explicit
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codecvt(size_t __refs = 0);
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explicit
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codecvt(__c_locale __cloc, size_t __refs = 0);
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protected:
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virtual
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~codecvt();
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virtual result
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do_out(state_type& __state, const intern_type* __from,
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const intern_type* __from_end, const intern_type*& __from_next,
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extern_type* __to, extern_type* __to_end,
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extern_type*& __to_next) const;
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virtual result
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do_unshift(state_type& __state, extern_type* __to,
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extern_type* __to_end, extern_type*& __to_next) const;
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virtual result
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do_in(state_type& __state, const extern_type* __from,
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const extern_type* __from_end, const extern_type*& __from_next,
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intern_type* __to, intern_type* __to_end,
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intern_type*& __to_next) const;
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virtual int
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do_encoding() const throw();
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virtual bool
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do_always_noconv() const throw();
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virtual int
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do_length(state_type&, const extern_type* __from,
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const extern_type* __end, size_t __max) const;
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virtual int
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do_max_length() const throw();
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};
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#ifdef _GLIBCXX_USE_WCHAR_T
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/// class codecvt<wchar_t, char, mbstate_t> specialization.
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template<>
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class codecvt<wchar_t, char, mbstate_t>
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: public __codecvt_abstract_base<wchar_t, char, mbstate_t>
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{
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public:
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// Types:
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typedef wchar_t intern_type;
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typedef char extern_type;
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typedef mbstate_t state_type;
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protected:
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__c_locale _M_c_locale_codecvt;
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public:
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static locale::id id;
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explicit
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codecvt(size_t __refs = 0);
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explicit
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codecvt(__c_locale __cloc, size_t __refs = 0);
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protected:
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virtual
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~codecvt();
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virtual result
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do_out(state_type& __state, const intern_type* __from,
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const intern_type* __from_end, const intern_type*& __from_next,
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extern_type* __to, extern_type* __to_end,
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extern_type*& __to_next) const;
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virtual result
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do_unshift(state_type& __state,
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extern_type* __to, extern_type* __to_end,
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extern_type*& __to_next) const;
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virtual result
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do_in(state_type& __state,
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const extern_type* __from, const extern_type* __from_end,
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const extern_type*& __from_next,
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intern_type* __to, intern_type* __to_end,
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intern_type*& __to_next) const;
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virtual
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int do_encoding() const throw();
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virtual
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bool do_always_noconv() const throw();
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virtual
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int do_length(state_type&, const extern_type* __from,
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const extern_type* __end, size_t __max) const;
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virtual int
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do_max_length() const throw();
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};
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#endif //_GLIBCXX_USE_WCHAR_T
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/// class codecvt_byname [22.2.1.6].
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template<typename _InternT, typename _ExternT, typename _StateT>
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class codecvt_byname : public codecvt<_InternT, _ExternT, _StateT>
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{
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public:
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explicit
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codecvt_byname(const char* __s, size_t __refs = 0)
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: codecvt<_InternT, _ExternT, _StateT>(__refs)
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{
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if (__builtin_strcmp(__s, "C") != 0
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&& __builtin_strcmp(__s, "POSIX") != 0)
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{
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this->_S_destroy_c_locale(this->_M_c_locale_codecvt);
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this->_S_create_c_locale(this->_M_c_locale_codecvt, __s);
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}
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}
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protected:
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virtual
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~codecvt_byname() { }
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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 codecvt_byname<char, char, mbstate_t>;
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extern template
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const codecvt<char, char, mbstate_t>&
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use_facet<codecvt<char, char, mbstate_t> >(const locale&);
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extern template
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bool
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has_facet<codecvt<char, char, mbstate_t> >(const locale&);
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#ifdef _GLIBCXX_USE_WCHAR_T
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extern template class codecvt_byname<wchar_t, char, mbstate_t>;
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extern template
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const codecvt<wchar_t, char, mbstate_t>&
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use_facet<codecvt<wchar_t, char, mbstate_t> >(const locale&);
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extern template
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bool
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has_facet<codecvt<wchar_t, char, mbstate_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 // _CODECVT_H
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