603 lines
20 KiB
C++
603 lines
20 KiB
C++
// String based streams -*- C++ -*-
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// Copyright (C) 1997-2013 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 include/sstream
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* This is a Standard C++ Library header.
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*/
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//
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// ISO C++ 14882: 27.7 String-based streams
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//
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#ifndef _GLIBCXX_SSTREAM
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#define _GLIBCXX_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 _GLIBCXX_VISIBILITY(default)
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{
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_GLIBCXX_BEGIN_NAMESPACE_VERSION
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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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* @ingroup io
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*
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* @tparam _CharT Type of character stream.
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* @tparam _Traits Traits for character type, defaults to
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* char_traits<_CharT>.
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* @tparam _Alloc Allocator type, defaults to allocator<_CharT>.
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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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// _GLIBCXX_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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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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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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protected:
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/// Place to stash in || out || in | out settings for current stringbuf.
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ios_base::openmode _M_mode;
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// Data Members:
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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_mode(__mode), _M_string()
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{ }
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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_mode(), _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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* <em>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.</em> [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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__string_type __ret;
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if (this->pptr())
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{
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// The current egptr() may not be the actual string end.
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if (this->pptr() > this->egptr())
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__ret = __string_type(this->pbase(), this->pptr());
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else
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__ret = __string_type(this->pbase(), this->egptr());
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}
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else
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__ret = _M_string;
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return __ret;
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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 goes here.
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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_mode = __mode;
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__size_type __len = 0;
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if (_M_mode & (ios_base::ate | ios_base::app))
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__len = _M_string.size();
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_M_sync(const_cast<char_type*>(_M_string.data()), 0, __len);
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}
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virtual streamsize
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showmanyc()
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{
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streamsize __ret = -1;
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if (_M_mode & ios_base::in)
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{
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_M_update_egptr();
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__ret = this->egptr() - this->gptr();
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}
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return __ret;
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}
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virtual int_type
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underflow();
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virtual int_type
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pbackfail(int_type __c = traits_type::eof());
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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++/manual/bk01pt11ch25s02.html
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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 >= 0)
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{
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// This is implementation-defined behavior, and assumes
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// that an external char_type array of length __n exists
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// and has been pre-allocated. If this is not the case,
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// things will quickly blow up.
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// Step 1: Destroy the current internal array.
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_M_string.clear();
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// Step 2: Use the external array.
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_M_sync(__s, __n, 0);
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}
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return this;
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}
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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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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 re-sizing
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// of an existing _M_string.
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void
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_M_sync(char_type* __base, __size_type __i, __size_type __o);
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// Internal function for correctly updating egptr() to the actual
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// string end.
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void
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_M_update_egptr()
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{
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const bool __testin = _M_mode & ios_base::in;
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if (this->pptr() && this->pptr() > this->egptr())
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{
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if (__testin)
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this->setg(this->eback(), this->gptr(), this->pptr());
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else
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this->setg(this->pptr(), this->pptr(), this->pptr());
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}
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}
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// Works around the issue with pbump, part of the protected
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// interface of basic_streambuf, taking just an int.
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void
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_M_pbump(char_type* __pbeg, char_type* __pend, off_type __off);
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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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* @ingroup io
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*
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* @tparam _CharT Type of character stream.
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* @tparam _Traits Traits for character type, defaults to
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* char_traits<_CharT>.
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* @tparam _Alloc Allocator type, defaults to allocator<_CharT>.
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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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// _GLIBCXX_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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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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__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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* 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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*/
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explicit
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basic_istringstream(ios_base::openmode __mode = ios_base::in)
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: __istream_type(), _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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* 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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*/
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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(), _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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* @ingroup io
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*
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* @tparam _CharT Type of character stream.
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* @tparam _Traits Traits for character type, defaults to
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* char_traits<_CharT>.
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* @tparam _Alloc Allocator type, defaults to allocator<_CharT>.
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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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// _GLIBCXX_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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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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__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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* 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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*/
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explicit
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basic_ostringstream(ios_base::openmode __mode = ios_base::out)
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: __ostream_type(), _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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* 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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*/
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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(), _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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* @ingroup io
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*
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* @tparam _CharT Type of character stream.
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* @tparam _Traits Traits for character type, defaults to
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* char_traits<_CharT>.
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* @tparam _Alloc Allocator type, defaults to allocator<_CharT>.
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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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// _GLIBCXX_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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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_iostream<char_type, traits_type> __iostream_type;
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private:
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__stringbuf_type _M_stringbuf;
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public:
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// Constructors/destructors
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/**
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* @brief Default constructor starts with an empty string buffer.
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* @param __m Whether the buffer can read, or write, or both.
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*
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* Initializes @c sb using the mode from @c __m, and passes @c
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* &sb to the base class initializer. Does not allocate any
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* buffer.
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*
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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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*/
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explicit
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basic_stringstream(ios_base::openmode __m = ios_base::out | ios_base::in)
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: __iostream_type(), _M_stringbuf(__m)
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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 __m Whether the buffer can read, or write, or both.
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*
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* Initializes @c sb using @a __str and @c __m, and passes @c &sb
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* to the base class initializer.
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*
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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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*/
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explicit
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basic_stringstream(const __string_type& __str,
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ios_base::openmode __m = ios_base::out | ios_base::in)
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: __iostream_type(), _M_stringbuf(__str, __m)
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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_stringstream()
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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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_GLIBCXX_END_NAMESPACE_VERSION
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} // namespace
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#include <bits/sstream.tcc>
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#endif /* _GLIBCXX_SSTREAM */
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