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 #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 * _GLIBCXX_RESOLVE_LIB_DEFECTS 89 * DR 2344 quoted()'s interaction with padding is unclear 90 */ 91 template<typename _CharT, typename _Traits> 92 std::basic_ostream<_CharT, _Traits>& 93 operator<<(std::basic_ostream<_CharT, _Traits>& __os, 94 const _Quoted_string<const _CharT*, _CharT>& __str) 95 { 96 std::basic_ostringstream<_CharT, _Traits> __ostr; 97 __ostr << __str._M_delim; 98 for (const _CharT* __c = __str._M_string; *__c; ++__c) 99 { 100 if (*__c == __str._M_delim || *__c == __str._M_escape) 101 __ostr << __str._M_escape; 102 __ostr << *__c; 103 } 104 __ostr << __str._M_delim; 105 106 return __os << __ostr.str(); 107 } 108 109 /** 110 * @brief Inserter for quoted strings. 111 * 112 * _GLIBCXX_RESOLVE_LIB_DEFECTS 113 * DR 2344 quoted()'s interaction with padding is unclear 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 std::basic_ostringstream<_CharT, _Traits> __ostr; 121 __ostr << __str._M_delim; 122 for (auto __c : __str._M_string) 123 { 124 if (__c == __str._M_delim || __c == __str._M_escape) 125 __ostr << __str._M_escape; 126 __ostr << __c; 127 } 128 __ostr << __str._M_delim; 129 130 return __os << __ostr.str(); 131 } 132 133 /** 134 * @brief Extractor for delimited strings. 135 * The left and right delimiters can be different. 136 */ 137 template<typename _CharT, typename _Traits, typename _Alloc> 138 std::basic_istream<_CharT, _Traits>& 139 operator>>(std::basic_istream<_CharT, _Traits>& __is, 140 const _Quoted_string<basic_string<_CharT, _Traits, _Alloc>&, 141 _CharT>& __str) 142 { 143 _CharT __c; 144 __is >> __c; 145 if (!__is.good()) 146 return __is; 147 if (__c != __str._M_delim) 148 { 149 __is.unget(); 150 __is >> __str._M_string; 151 return __is; 152 } 153 __str._M_string.clear(); 154 std::ios_base::fmtflags __flags 155 = __is.flags(__is.flags() & ~std::ios_base::skipws); 156 do 157 { 158 __is >> __c; 159 if (!__is.good()) 160 break; 161 if (__c == __str._M_escape) 162 { 163 __is >> __c; 164 if (!__is.good()) 165 break; 166 } 167 else if (__c == __str._M_delim) 168 break; 169 __str._M_string += __c; 170 } 171 while (true); 172 __is.setf(__flags); 173 174 return __is; 175 } 176 } // namespace __detail 177 178 _GLIBCXX_END_NAMESPACE_VERSION 179 } // namespace std 180 181 #endif // C++11 182 #endif /* _GLIBCXX_QUOTED_STRING_H */ 183