1 // Helpers for quoted stream manipulators -*- C++ -*-
2
3 // Copyright (C) 2013-2022 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
_GLIBCXX_VISIBILITY(default)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 */
187