contrib/gcc-8.0/libstdc++-v3/include/bits/quoted_string.h

   1 // Helpers for quoted stream manipulators -*- C++ -*-
   2
   3 // Copyright (C) 2013-2018 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     /**
  68      * @brief Inserter for quoted strings.
  69      *
  70      *  _GLIBCXX_RESOLVE_LIB_DEFECTS
  71      *  DR 2344 quoted()'s interaction with padding is unclear
  72      */
  73     template<typename _CharT, typename _Traits>
  74       std::basic_ostream<_CharT, _Traits>&
  75       operator<<(std::basic_ostream<_CharT, _Traits>& __os,
  76                  const _Quoted_string<const _CharT*, _CharT>& __str)
  77       {
  78         std::basic_ostringstream<_CharT, _Traits> __ostr;
  79         __ostr << __str._M_delim;
  80         for (const _CharT* __c = __str._M_string; *__c; ++__c)
  81           {
  82             if (*__c == __str._M_delim || *__c == __str._M_escape)
  83               __ostr << __str._M_escape;
  84             __ostr << *__c;
  85           }
  86         __ostr << __str._M_delim;
  87
  88         return __os << __ostr.str();
  89       }
  90
  91     /**
  92      * @brief Inserter for quoted strings.
  93      *
  94      *  _GLIBCXX_RESOLVE_LIB_DEFECTS
  95      *  DR 2344 quoted()'s interaction with padding is unclear
  96      */
  97     template<typename _CharT, typename _Traits, typename _String>
  98       std::basic_ostream<_CharT, _Traits>&
  99       operator<<(std::basic_ostream<_CharT, _Traits>& __os,
 100                  const _Quoted_string<_String, _CharT>& __str)
 101       {
 102         std::basic_ostringstream<_CharT, _Traits> __ostr;
 103         __ostr << __str._M_delim;
 104         for (auto& __c : __str._M_string)
 105           {
 106             if (__c == __str._M_delim || __c == __str._M_escape)
 107               __ostr << __str._M_escape;
 108             __ostr << __c;
 109           }
 110         __ostr << __str._M_delim;
 111
 112         return __os << __ostr.str();
 113       }
 114
 115     /**
 116      * @brief Extractor for delimited strings.
 117      *        The left and right delimiters can be different.
 118      */
 119     template<typename _CharT, typename _Traits, typename _Alloc>
 120       std::basic_istream<_CharT, _Traits>&
 121       operator>>(std::basic_istream<_CharT, _Traits>& __is,
 122                  const _Quoted_string<basic_string<_CharT, _Traits, _Alloc>&,
 123                                       _CharT>& __str)
 124       {
 125         _CharT __c;
 126         __is >> __c;
 127         if (!__is.good())
 128           return __is;
 129         if (__c != __str._M_delim)
 130           {
 131             __is.unget();
 132             __is >> __str._M_string;
 133             return __is;
 134           }
 135         __str._M_string.clear();
 136         std::ios_base::fmtflags __flags
 137           = __is.flags(__is.flags() & ~std::ios_base::skipws);
 138         do
 139           {
 140             __is >> __c;
 141             if (!__is.good())
 142               break;
 143             if (__c == __str._M_escape)
 144               {
 145                 __is >> __c;
 146                 if (!__is.good())
 147                   break;
 148               }
 149             else if (__c == __str._M_delim)
 150               break;
 151             __str._M_string += __c;
 152           }
 153         while (true);
 154         __is.setf(__flags);
 155
 156         return __is;
 157       }
 158   } // namespace __detail
 159
 160 _GLIBCXX_END_NAMESPACE_VERSION
 161 } // namespace std
 162
 163 #endif // C++11
 164 #endif /* _GLIBCXX_QUOTED_STRING_H */