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The C and C++ Include Header Files

/usr/include/c++/13/bits/quoted_string.h


$ cat -n /usr/include/c++/13/bits/quoted_string.h

     1	// Helpers for quoted stream manipulators -*- C++ -*-
     2	
     3	// Copyright (C) 2013-2023 Free Software Foundation, Inc.
     4	//
     5	// This file is part of the GNU ISO C++ Library.  This library is free
     6	// software; you can redistribute it and/or modify it under the
     7	// terms of the GNU General Public License as published by the
     8	// Free Software Foundation; either version 3, or (at your option)
     9	// any later version.
    10	
    11	// This library is distributed in the hope that it will be useful,
    12	// but WITHOUT ANY WARRANTY; without even the implied warranty of
    13	// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    14	// GNU General Public License for more details.
    15	
    16	// Under Section 7 of GPL version 3, you are granted additional
    17	// permissions described in the GCC Runtime Library Exception, version
    18	// 3.1, as published by the Free Software Foundation.
    19	
    20	// You should have received a copy of the GNU General Public License and
    21	// a copy of the GCC Runtime Library Exception along with this program;
    22	// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
    23	// <http://www.gnu.org/licenses/>.
    24	
    25	/** @file bits/quoted_string.h
    26	 *  This is an internal header file, included by other library headers.
    27	 *  Do not attempt to use it directly. @headername{iomanip}
    28	 */
    29	
    30	#ifndef _GLIBCXX_QUOTED_STRING_H
    31	#define _GLIBCXX_QUOTED_STRING_H 1
    32	
    33	#pragma GCC system_header
    34	
    35	#if __cplusplus < 201103L
    36	# include <bits/c++0x_warning.h>
    37	#else
    38	#include <sstream>
    39	
    40	namespace std _GLIBCXX_VISIBILITY(default)
    41	{
    42	_GLIBCXX_BEGIN_NAMESPACE_VERSION
    43	
    44	  namespace __detail {
    45	    /**
    46	     * @brief Struct for delimited strings.
    47	     */
    48	    template<typename _String, typename _CharT>
    49	      struct _Quoted_string
    50	      {
    51		static_assert(is_reference<_String>::value
    52			   || is_pointer<_String>::value,
    53			      "String type must be pointer or reference");
    54	
    55		_Quoted_string(_String __str, _CharT __del, _CharT __esc)
    56		: _M_string(__str), _M_delim{__del}, _M_escape{__esc}
    57		{ }
    58	
    59		_Quoted_string&
    60		operator=(_Quoted_string&) = delete;
    61	
    62		_String _M_string;
    63		_CharT _M_delim;
    64		_CharT _M_escape;
    65	      };
    66	
    67	#if __cplusplus >= 201703L
    68	    template<typename _CharT, typename _Traits>
    69	      struct _Quoted_string<basic_string_view<_CharT, _Traits>, _CharT>
    70	      {
    71		_Quoted_string(basic_string_view<_CharT, _Traits> __str,
    72			       _CharT __del, _CharT __esc)
    73		: _M_string(__str), _M_delim{__del}, _M_escape{__esc}
    74		{ }
    75	
    76		_Quoted_string&
    77		operator=(_Quoted_string&) = delete;
    78	
    79		basic_string_view<_CharT, _Traits> _M_string;
    80		_CharT _M_delim;
    81		_CharT _M_escape;
    82	      };
    83	#endif // C++17
    84	
    85	    /**
    86	     * @brief Inserter for quoted strings.
    87	     *
    88	     * @headerfile iomanip
    89	     */
    90	    template<typename _CharT, typename _Traits>
    91	      std::basic_ostream<_CharT, _Traits>&
    92	      operator<<(std::basic_ostream<_CharT, _Traits>& __os,
    93			 const _Quoted_string<const _CharT*, _CharT>& __str)
    94	      {
    95		//  _GLIBCXX_RESOLVE_LIB_DEFECTS
    96		//  DR 2344 quoted()'s interaction with padding is unclear
    97		std::basic_ostringstream<_CharT, _Traits> __ostr;
    98		__ostr << __str._M_delim;
    99		for (const _CharT* __c = __str._M_string; *__c; ++__c)
   100		  {
   101		    if (*__c == __str._M_delim || *__c == __str._M_escape)
   102		      __ostr << __str._M_escape;
   103		    __ostr << *__c;
   104		  }
   105		__ostr << __str._M_delim;
   106	
   107		return __os << __ostr.str();
   108	      }
   109	
   110	    /**
   111	     * @brief Inserter for quoted strings.
   112	     *
   113	     * @headerfile iomanip
   114	     */
   115	    template<typename _CharT, typename _Traits, typename _String>
   116	      std::basic_ostream<_CharT, _Traits>&
   117	      operator<<(std::basic_ostream<_CharT, _Traits>& __os,
   118			 const _Quoted_string<_String, _CharT>& __str)
   119	      {
   120		//  _GLIBCXX_RESOLVE_LIB_DEFECTS
   121		//  DR 2344 quoted()'s interaction with padding is unclear
   122		std::basic_ostringstream<_CharT, _Traits> __ostr;
   123		__ostr << __str._M_delim;
   124		for (auto __c : __str._M_string)
   125		  {
   126		    if (__c == __str._M_delim || __c == __str._M_escape)
   127		      __ostr << __str._M_escape;
   128		    __ostr << __c;
   129		  }
   130		__ostr << __str._M_delim;
   131	
   132		return __os << __ostr.str();
   133	      }
   134	
   135	    /**
   136	     * @brief Extractor for delimited strings.
   137	     *        The left and right delimiters can be different.
   138	     *
   139	     * @headerfile iomanip
   140	     */
   141	    template<typename _CharT, typename _Traits, typename _Alloc>
   142	      std::basic_istream<_CharT, _Traits>&
   143	      operator>>(std::basic_istream<_CharT, _Traits>& __is,
   144			 const _Quoted_string<basic_string<_CharT, _Traits, _Alloc>&,
   145					      _CharT>& __str)
   146	      {
   147		_CharT __c;
   148		__is >> __c;
   149		if (!__is.good())
   150		  return __is;
   151		if (__c != __str._M_delim)
   152		  {
   153		    __is.unget();
   154		    __is >> __str._M_string;
   155		    return __is;
   156		  }
   157		__str._M_string.clear();
   158		std::ios_base::fmtflags __flags
   159		  = __is.flags(__is.flags() & ~std::ios_base::skipws);
   160		do
   161		  {
   162		    __is >> __c;
   163		    if (!__is.good())
   164		      break;
   165		    if (__c == __str._M_escape)
   166		      {
   167			__is >> __c;
   168			if (!__is.good())
   169			  break;
   170		      }
   171		    else if (__c == __str._M_delim)
   172		      break;
   173		    __str._M_string += __c;
   174		  }
   175		while (true);
   176		__is.setf(__flags);
   177	
   178		return __is;
   179	      }
   180	  } // namespace __detail
   181	
   182	_GLIBCXX_END_NAMESPACE_VERSION
   183	} // namespace std
   184	
   185	#endif // C++11
   186	#endif /* _GLIBCXX_QUOTED_STRING_H */