639 lines
20 KiB
C++
639 lines
20 KiB
C++
// String based streams -*- C++ -*-
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// Copyright (C) 1997, 1998, 1999, 2002, 2003 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 2, 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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// You should have received a copy of the GNU General Public License along
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// with this library; see the file COPYING. If not, write to the Free
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// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
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// USA.
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// As a special exception, you may use this file as part of a free software
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// library without restriction. Specifically, if other files instantiate
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// templates or use macros or inline functions from this file, or you compile
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// this file and link it with other files to produce an executable, this
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// file does not by itself cause the resulting executable to be covered by
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// the GNU General Public License. This exception does not however
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// invalidate any other reasons why the executable file might be covered by
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// the GNU General Public License.
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//
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// ISO C++ 14882: 27.7 String-based streams
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//
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/** @file sstream
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* This is a Standard C++ Library header. You should @c #include this header
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* in your programs, rather than any of the "st[dl]_*.h" implementation files.
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*/
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#ifndef _CPP_SSTREAM
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#define _CPP_SSTREAM 1
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#pragma GCC system_header
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#include <istream>
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#include <ostream>
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namespace std
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{
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// [27.7.1] template class basic_stringbuf
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/**
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* @brief The actual work of input and output (for std::string).
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*
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* This class associates either or both of its input and output sequences
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* with a sequence of characters, which can be initialized from, or made
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* available as, a @c std::basic_string. (Paraphrased from [27.7.1]/1.)
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*
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* For this class, open modes (of type @c ios_base::openmode) have
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* @c in set if the input sequence can be read, and @c out set if the
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* output sequence can be written.
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*/
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template<typename _CharT, typename _Traits, typename _Alloc>
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class basic_stringbuf : public basic_streambuf<_CharT, _Traits>
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{
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public:
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// Types:
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typedef _CharT char_type;
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typedef _Traits traits_type;
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#ifdef _GLIBCPP_RESOLVE_LIB_DEFECTS
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// 251. basic_stringbuf missing allocator_type
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typedef _Alloc allocator_type;
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#endif
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typedef typename traits_type::int_type int_type;
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typedef typename traits_type::pos_type pos_type;
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typedef typename traits_type::off_type off_type;
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//@{
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/**
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* @if maint
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* @doctodo
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* @endif
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*/
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typedef basic_streambuf<char_type, traits_type> __streambuf_type;
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typedef basic_string<char_type, _Traits, _Alloc> __string_type;
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typedef typename __string_type::size_type __size_type;
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//@}
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protected:
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// Data Members:
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/**
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* @if maint
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* @doctodo
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* @endif
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*/
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__string_type _M_string;
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public:
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// Constructors:
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/**
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* @brief Starts with an empty string buffer.
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* @param mode Whether the buffer can read, or write, or both.
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*
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* The default constructor initializes the parent class using its
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* own default ctor.
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*/
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explicit
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basic_stringbuf(ios_base::openmode __mode = ios_base::in | ios_base::out)
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: __streambuf_type(), _M_string()
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{ _M_stringbuf_init(__mode); }
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/**
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* @brief Starts with an existing string buffer.
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* @param str A string to copy as a starting buffer.
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* @param mode Whether the buffer can read, or write, or both.
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*
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* This constructor initializes the parent class using its
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* own default ctor.
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*/
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explicit
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basic_stringbuf(const __string_type& __str,
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ios_base::openmode __mode = ios_base::in | ios_base::out)
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: __streambuf_type(), _M_string(__str.data(), __str.size())
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{ _M_stringbuf_init(__mode); }
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// Get and set:
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/**
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* @brief Copying out the string buffer.
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* @return A copy of one of the underlying sequences.
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*
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* "If the buffer is only created in input mode, the underlying
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* character sequence is equal to the input sequence; otherwise, it
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* is equal to the output sequence." [27.7.1.2]/1
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*/
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__string_type
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str() const
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{
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if (_M_mode & ios_base::out)
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{
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// This is the deal: _M_string.size() is a value that
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// represents the size of the initial string that makes
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// _M_string, and may not be the correct size of the
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// current stringbuf internal buffer.
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__size_type __len = _M_string.size();
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if (_M_out_end > _M_out_beg)
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__len = max(__size_type(_M_out_end - _M_out_beg), __len);
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return __string_type(_M_out_beg, _M_out_beg + __len);
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}
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else
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return _M_string;
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}
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/**
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* @brief Setting a new buffer.
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* @param s The string to use as a new sequence.
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*
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* Deallocates any previous stored sequence, then copies @a s to
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* use as a new one.
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*/
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void
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str(const __string_type& __s)
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{
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// Cannot use _M_string = __s, since v3 strings are COW.
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_M_string.assign(__s.data(), __s.size());
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_M_stringbuf_init(_M_mode);
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}
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protected:
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// Common initialization code for both ctors goes here.
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/**
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* @if maint
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* @doctodo
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* @endif
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*/
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void
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_M_stringbuf_init(ios_base::openmode __mode)
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{
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// _M_buf_size is a convenient alias for "what the streambuf
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// thinks the allocated size of the string really is." This is
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// necessary as ostringstreams are implemented with the
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// streambufs having control of the allocation and
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// re-allocation of the internal string object, _M_string.
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_M_buf_size = _M_string.size();
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// NB: Start ostringstream buffers at 512 bytes. This is an
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// experimental value (pronounced "arbitrary" in some of the
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// hipper english-speaking countries), and can be changed to
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// suit particular needs.
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_M_buf_size_opt = 512;
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_M_mode = __mode;
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if (_M_mode & (ios_base::ate | ios_base::app))
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_M_really_sync(0, _M_buf_size);
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else
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_M_really_sync(0, 0);
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}
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// Overridden virtual functions:
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// [documentation is inherited]
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virtual int_type
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underflow()
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{
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if (_M_in_cur && _M_in_cur < _M_in_end)
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return traits_type::to_int_type(*gptr());
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else
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return traits_type::eof();
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}
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// [documentation is inherited]
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virtual int_type
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pbackfail(int_type __c = traits_type::eof());
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// [documentation is inherited]
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virtual int_type
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overflow(int_type __c = traits_type::eof());
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/**
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* @brief Manipulates the buffer.
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* @param s Pointer to a buffer area.
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* @param n Size of @a s.
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* @return @c this
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*
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* If no buffer has already been created, and both @a s and @a n are
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* non-zero, then @c s is used as a buffer; see
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* http://gcc.gnu.org/onlinedocs/libstdc++/27_io/howto.html#2
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* for more.
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*/
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virtual __streambuf_type*
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setbuf(char_type* __s, streamsize __n)
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{
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if (__s && __n)
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{
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_M_string = __string_type(__s, __n);
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_M_really_sync(0, 0);
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}
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return this;
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}
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// [documentation is inherited]
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virtual pos_type
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seekoff(off_type __off, ios_base::seekdir __way,
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ios_base::openmode __mode = ios_base::in | ios_base::out);
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// [documentation is inherited]
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virtual pos_type
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seekpos(pos_type __sp,
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ios_base::openmode __mode = ios_base::in | ios_base::out);
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// Internal function for correctly updating the internal buffer
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// for a particular _M_string, due to initialization or
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// re-sizing of an existing _M_string.
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// Assumes: contents of _M_string and internal buffer match exactly.
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// __i == _M_in_cur - _M_in_beg
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// __o == _M_out_cur - _M_out_beg
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/**
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* @if maint
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* @doctodo
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* @endif
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*/
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virtual int
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_M_really_sync(__size_type __i, __size_type __o)
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{
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char_type* __base = const_cast<char_type*>(_M_string.data());
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bool __testin = _M_mode & ios_base::in;
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bool __testout = _M_mode & ios_base::out;
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__size_type __len = _M_string.size();
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_M_buf = __base;
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if (__testin)
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this->setg(__base, __base + __i, __base + __len);
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if (__testout)
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{
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this->setp(__base, __base + __len);
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_M_out_cur += __o;
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}
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return 0;
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}
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};
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// [27.7.2] Template class basic_istringstream
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/**
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* @brief Controlling input for std::string.
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*
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* This class supports reading from objects of type std::basic_string,
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* using the inherited functions from std::basic_istream. To control
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* the associated sequence, an instance of std::basic_stringbuf is used,
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* which this page refers to as @c sb.
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*/
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template<typename _CharT, typename _Traits, typename _Alloc>
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class basic_istringstream : public basic_istream<_CharT, _Traits>
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{
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public:
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// Types:
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typedef _CharT char_type;
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typedef _Traits traits_type;
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#ifdef _GLIBCPP_RESOLVE_LIB_DEFECTS
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// 251. basic_stringbuf missing allocator_type
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typedef _Alloc allocator_type;
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#endif
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typedef typename traits_type::int_type int_type;
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typedef typename traits_type::pos_type pos_type;
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typedef typename traits_type::off_type off_type;
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// Non-standard types:
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typedef basic_string<_CharT, _Traits, _Alloc> __string_type;
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typedef basic_stringbuf<_CharT, _Traits, _Alloc> __stringbuf_type;
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typedef basic_istream<char_type, traits_type> __istream_type;
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private:
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/**
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* @if maint
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* @doctodo
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* @endif
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*/
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__stringbuf_type _M_stringbuf;
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public:
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// Constructors:
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/**
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* @brief Default constructor starts with an empty string buffer.
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* @param mode Whether the buffer can read, or write, or both.
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*
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* @c ios_base::in is automatically included in @a mode.
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*
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* Initializes @c sb using @c mode|in, and passes @c &sb to the base
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* class initializer. Does not allocate any buffer.
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*
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* @if maint
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* That's a lie. We initialize the base class with NULL, because the
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* string class does its own memory management.
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* @endif
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*/
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explicit
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basic_istringstream(ios_base::openmode __mode = ios_base::in)
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: __istream_type(NULL), _M_stringbuf(__mode | ios_base::in)
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{ this->init(&_M_stringbuf); }
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/**
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* @brief Starts with an existing string buffer.
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* @param str A string to copy as a starting buffer.
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* @param mode Whether the buffer can read, or write, or both.
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*
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* @c ios_base::in is automatically included in @a mode.
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*
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* Initializes @c sb using @a str and @c mode|in, and passes @c &sb
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* to the base class initializer.
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*
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* @if maint
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* That's a lie. We initialize the base class with NULL, because the
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* string class does its own memory management.
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* @endif
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*/
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explicit
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basic_istringstream(const __string_type& __str,
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ios_base::openmode __mode = ios_base::in)
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: __istream_type(NULL), _M_stringbuf(__str, __mode | ios_base::in)
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{ this->init(&_M_stringbuf); }
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/**
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* @brief The destructor does nothing.
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*
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* The buffer is deallocated by the stringbuf object, not the
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* formatting stream.
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*/
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~basic_istringstream()
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{ }
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// Members:
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/**
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* @brief Accessing the underlying buffer.
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* @return The current basic_stringbuf buffer.
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*
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* This hides both signatures of std::basic_ios::rdbuf().
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*/
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__stringbuf_type*
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rdbuf() const
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{ return const_cast<__stringbuf_type*>(&_M_stringbuf); }
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/**
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* @brief Copying out the string buffer.
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* @return @c rdbuf()->str()
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*/
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__string_type
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str() const
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{ return _M_stringbuf.str(); }
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/**
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* @brief Setting a new buffer.
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* @param s The string to use as a new sequence.
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*
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* Calls @c rdbuf()->str(s).
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*/
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void
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str(const __string_type& __s)
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{ _M_stringbuf.str(__s); }
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};
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// [27.7.3] Template class basic_ostringstream
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/**
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* @brief Controlling output for std::string.
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*
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* This class supports writing to objects of type std::basic_string,
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* using the inherited functions from std::basic_ostream. To control
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* the associated sequence, an instance of std::basic_stringbuf is used,
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* which this page refers to as @c sb.
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*/
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template <typename _CharT, typename _Traits, typename _Alloc>
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class basic_ostringstream : public basic_ostream<_CharT, _Traits>
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{
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public:
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// Types:
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typedef _CharT char_type;
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typedef _Traits traits_type;
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#ifdef _GLIBCPP_RESOLVE_LIB_DEFECTS
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// 251. basic_stringbuf missing allocator_type
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typedef _Alloc allocator_type;
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#endif
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typedef typename traits_type::int_type int_type;
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typedef typename traits_type::pos_type pos_type;
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typedef typename traits_type::off_type off_type;
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// Non-standard types:
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typedef basic_string<_CharT, _Traits, _Alloc> __string_type;
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typedef basic_stringbuf<_CharT, _Traits, _Alloc> __stringbuf_type;
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typedef basic_ostream<char_type, traits_type> __ostream_type;
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private:
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/**
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* @if maint
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* @doctodo
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* @endif
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*/
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__stringbuf_type _M_stringbuf;
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public:
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// Constructors/destructor:
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/**
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* @brief Default constructor starts with an empty string buffer.
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* @param mode Whether the buffer can read, or write, or both.
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*
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* @c ios_base::out is automatically included in @a mode.
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*
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* Initializes @c sb using @c mode|out, and passes @c &sb to the base
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* class initializer. Does not allocate any buffer.
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*
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* @if maint
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* That's a lie. We initialize the base class with NULL, because the
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* string class does its own memory management.
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* @endif
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*/
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explicit
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basic_ostringstream(ios_base::openmode __mode = ios_base::out)
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: __ostream_type(NULL), _M_stringbuf(__mode | ios_base::out)
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{ this->init(&_M_stringbuf); }
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/**
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* @brief Starts with an existing string buffer.
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* @param str A string to copy as a starting buffer.
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* @param mode Whether the buffer can read, or write, or both.
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*
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* @c ios_base::out is automatically included in @a mode.
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*
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* Initializes @c sb using @a str and @c mode|out, and passes @c &sb
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* to the base class initializer.
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*
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* @if maint
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* That's a lie. We initialize the base class with NULL, because the
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* string class does its own memory management.
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* @endif
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*/
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explicit
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basic_ostringstream(const __string_type& __str,
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ios_base::openmode __mode = ios_base::out)
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: __ostream_type(NULL), _M_stringbuf(__str, __mode | ios_base::out)
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{ this->init(&_M_stringbuf); }
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/**
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* @brief The destructor does nothing.
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*
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* The buffer is deallocated by the stringbuf object, not the
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* formatting stream.
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*/
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~basic_ostringstream()
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{ }
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// Members:
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/**
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* @brief Accessing the underlying buffer.
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* @return The current basic_stringbuf buffer.
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*
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* This hides both signatures of std::basic_ios::rdbuf().
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*/
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__stringbuf_type*
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rdbuf() const
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{ return const_cast<__stringbuf_type*>(&_M_stringbuf); }
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/**
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* @brief Copying out the string buffer.
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* @return @c rdbuf()->str()
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*/
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__string_type
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str() const
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{ return _M_stringbuf.str(); }
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/**
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* @brief Setting a new buffer.
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* @param s The string to use as a new sequence.
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*
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* Calls @c rdbuf()->str(s).
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*/
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void
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str(const __string_type& __s)
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{ _M_stringbuf.str(__s); }
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};
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// [27.7.4] Template class basic_stringstream
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/**
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* @brief Controlling input and output for std::string.
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*
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* This class supports reading from and writing to objects of type
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* std::basic_string, using the inherited functions from
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* std::basic_iostream. To control the associated sequence, an instance
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* of std::basic_stringbuf is used, which this page refers to as @c sb.
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*/
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template <typename _CharT, typename _Traits, typename _Alloc>
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class basic_stringstream : public basic_iostream<_CharT, _Traits>
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{
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public:
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|
// Types:
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|
typedef _CharT char_type;
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typedef _Traits traits_type;
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#ifdef _GLIBCPP_RESOLVE_LIB_DEFECTS
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// 251. basic_stringbuf missing allocator_type
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|
typedef _Alloc allocator_type;
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|
#endif
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|
typedef typename traits_type::int_type int_type;
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|
typedef typename traits_type::pos_type pos_type;
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|
typedef typename traits_type::off_type off_type;
|
|
|
|
// Non-standard Types:
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|
typedef basic_string<_CharT, _Traits, _Alloc> __string_type;
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|
typedef basic_stringbuf<_CharT, _Traits, _Alloc> __stringbuf_type;
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|
typedef basic_iostream<char_type, traits_type> __iostream_type;
|
|
|
|
private:
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|
/**
|
|
* @if maint
|
|
* @doctodo
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|
* @endif
|
|
*/
|
|
__stringbuf_type _M_stringbuf;
|
|
|
|
public:
|
|
// Constructors/destructors
|
|
/**
|
|
* @brief Default constructor starts with an empty string buffer.
|
|
* @param mode Whether the buffer can read, or write, or both.
|
|
*
|
|
* Initializes @c sb using @c mode, and passes @c &sb to the base
|
|
* class initializer. Does not allocate any buffer.
|
|
*
|
|
* @if maint
|
|
* That's a lie. We initialize the base class with NULL, because the
|
|
* string class does its own memory management.
|
|
* @endif
|
|
*/
|
|
explicit
|
|
basic_stringstream(ios_base::openmode __m = ios_base::out | ios_base::in)
|
|
: __iostream_type(NULL), _M_stringbuf(__m)
|
|
{ this->init(&_M_stringbuf); }
|
|
|
|
/**
|
|
* @brief Starts with an existing string buffer.
|
|
* @param str A string to copy as a starting buffer.
|
|
* @param mode Whether the buffer can read, or write, or both.
|
|
*
|
|
* Initializes @c sb using @a str and @c mode, and passes @c &sb
|
|
* to the base class initializer.
|
|
*
|
|
* @if maint
|
|
* That's a lie. We initialize the base class with NULL, because the
|
|
* string class does its own memory management.
|
|
* @endif
|
|
*/
|
|
explicit
|
|
basic_stringstream(const __string_type& __str,
|
|
ios_base::openmode __m = ios_base::out | ios_base::in)
|
|
: __iostream_type(NULL), _M_stringbuf(__str, __m)
|
|
{ this->init(&_M_stringbuf); }
|
|
|
|
/**
|
|
* @brief The destructor does nothing.
|
|
*
|
|
* The buffer is deallocated by the stringbuf object, not the
|
|
* formatting stream.
|
|
*/
|
|
~basic_stringstream()
|
|
{ }
|
|
|
|
// Members:
|
|
/**
|
|
* @brief Accessing the underlying buffer.
|
|
* @return The current basic_stringbuf buffer.
|
|
*
|
|
* This hides both signatures of std::basic_ios::rdbuf().
|
|
*/
|
|
__stringbuf_type*
|
|
rdbuf() const
|
|
{ return const_cast<__stringbuf_type*>(&_M_stringbuf); }
|
|
|
|
/**
|
|
* @brief Copying out the string buffer.
|
|
* @return @c rdbuf()->str()
|
|
*/
|
|
__string_type
|
|
str() const
|
|
{ return _M_stringbuf.str(); }
|
|
|
|
/**
|
|
* @brief Setting a new buffer.
|
|
* @param s The string to use as a new sequence.
|
|
*
|
|
* Calls @c rdbuf()->str(s).
|
|
*/
|
|
void
|
|
str(const __string_type& __s)
|
|
{ _M_stringbuf.str(__s); }
|
|
};
|
|
} // namespace std
|
|
|
|
#ifdef _GLIBCPP_NO_TEMPLATE_EXPORT
|
|
# define export
|
|
#endif
|
|
#ifdef _GLIBCPP_FULLY_COMPLIANT_HEADERS
|
|
# include <bits/sstream.tcc>
|
|
#endif
|
|
|
|
#endif
|