1// Helpers for quoted stream manipulators -*- C++ -*-
2
3// Copyright (C) 2013-2017 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 namespace __detail {
43 _GLIBCXX_BEGIN_NAMESPACE_VERSION
44
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
159 _GLIBCXX_END_NAMESPACE_VERSION
160 } // namespace __detail
161} // namespace std
162
163#endif // C++11
164#endif /* _GLIBCXX_QUOTED_STRING_H */
165