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 */ 165