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1 : // Helpers for quoted stream manipulators -*- C++ -*-
2 :
3 : // Copyright (C) 2013-2021 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 0 : _Quoted_string(_String __str, _CharT __del, _CharT __esc)
56 0 : : _M_string(__str), _M_delim{__del}, _M_escape{__esc}
57 0 : { }
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 0 : operator<<(std::basic_ostream<_CharT, _Traits>& __os,
118 : const _Quoted_string<_String, _CharT>& __str)
119 : {
120 0 : std::basic_ostringstream<_CharT, _Traits> __ostr;
121 0 : __ostr << __str._M_delim;
122 0 : for (auto __c : __str._M_string)
123 : {
124 0 : if (__c == __str._M_delim || __c == __str._M_escape)
125 0 : __ostr << __str._M_escape;
126 0 : __ostr << __c;
127 : }
128 0 : __ostr << __str._M_delim;
129 :
130 0 : return __os << __ostr.str();
131 0 : }
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 */
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