1// Helpers for quoted stream manipulators -*- C++ -*-
2
3// Copyright (C) 2013-2015 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