1// Helpers for quoted stream manipulators -*- C++ -*-
2
3// Copyright (C) 2013-2019 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
40namespace 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