quoted_string.h
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// Helpers for quoted stream manipulators -*- C++ -*-
// Copyright (C) 2013-2021 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// Under Section 7 of GPL version 3, you are granted additional
// permissions described in the GCC Runtime Library Exception, version
// 3.1, as published by the Free Software Foundation.
// You should have received a copy of the GNU General Public License and
// a copy of the GCC Runtime Library Exception along with this program;
// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
// <http://www.gnu.org/licenses/>.
/** @file bits/quoted_string.h
* This is an internal header file, included by other library headers.
* Do not attempt to use it directly. @headername{iomanip}
*/
#ifndef _GLIBCXX_QUOTED_STRING_H
#define _GLIBCXX_QUOTED_STRING_H 1
#pragma GCC system_header
#if __cplusplus < 201103L
# include <bits/c++0x_warning.h>
#else
#include <sstream>
namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION
namespace __detail {
/**
* @brief Struct for delimited strings.
*/
template<typename _String, typename _CharT>
struct _Quoted_string
{
static_assert(is_reference<_String>::value
|| is_pointer<_String>::value,
"String type must be pointer or reference");
_Quoted_string(_String __str, _CharT __del, _CharT __esc)
: _M_string(__str), _M_delim{__del}, _M_escape{__esc}
{ }
_Quoted_string&
operator=(_Quoted_string&) = delete;
_String _M_string;
_CharT _M_delim;
_CharT _M_escape;
};
#if __cplusplus >= 201703L
template<typename _CharT, typename _Traits>
struct _Quoted_string<basic_string_view<_CharT, _Traits>, _CharT>
{
_Quoted_string(basic_string_view<_CharT, _Traits> __str,
_CharT __del, _CharT __esc)
: _M_string(__str), _M_delim{__del}, _M_escape{__esc}
{ }
_Quoted_string&
operator=(_Quoted_string&) = delete;
basic_string_view<_CharT, _Traits> _M_string;
_CharT _M_delim;
_CharT _M_escape;
};
#endif // C++17
/**
* @brief Inserter for quoted strings.
*
* _GLIBCXX_RESOLVE_LIB_DEFECTS
* DR 2344 quoted()'s interaction with padding is unclear
*/
template<typename _CharT, typename _Traits>
std::basic_ostream<_CharT, _Traits>&
operator<<(std::basic_ostream<_CharT, _Traits>& __os,
const _Quoted_string<const _CharT*, _CharT>& __str)
{
std::basic_ostringstream<_CharT, _Traits> __ostr;
__ostr << __str._M_delim;
for (const _CharT* __c = __str._M_string; *__c; ++__c)
{
if (*__c == __str._M_delim || *__c == __str._M_escape)
__ostr << __str._M_escape;
__ostr << *__c;
}
__ostr << __str._M_delim;
return __os << __ostr.str();
}
/**
* @brief Inserter for quoted strings.
*
* _GLIBCXX_RESOLVE_LIB_DEFECTS
* DR 2344 quoted()'s interaction with padding is unclear
*/
template<typename _CharT, typename _Traits, typename _String>
std::basic_ostream<_CharT, _Traits>&
operator<<(std::basic_ostream<_CharT, _Traits>& __os,
const _Quoted_string<_String, _CharT>& __str)
{
std::basic_ostringstream<_CharT, _Traits> __ostr;
__ostr << __str._M_delim;
for (auto __c : __str._M_string)
{
if (__c == __str._M_delim || __c == __str._M_escape)
__ostr << __str._M_escape;
__ostr << __c;
}
__ostr << __str._M_delim;
return __os << __ostr.str();
}
/**
* @brief Extractor for delimited strings.
* The left and right delimiters can be different.
*/
template<typename _CharT, typename _Traits, typename _Alloc>
std::basic_istream<_CharT, _Traits>&
operator>>(std::basic_istream<_CharT, _Traits>& __is,
const _Quoted_string<basic_string<_CharT, _Traits, _Alloc>&,
_CharT>& __str)
{
_CharT __c;
__is >> __c;
if (!__is.good())
return __is;
if (__c != __str._M_delim)
{
__is.unget();
__is >> __str._M_string;
return __is;
}
__str._M_string.clear();
std::ios_base::fmtflags __flags
= __is.flags(__is.flags() & ~std::ios_base::skipws);
do
{
__is >> __c;
if (!__is.good())
break;
if (__c == __str._M_escape)
{
__is >> __c;
if (!__is.good())
break;
}
else if (__c == __str._M_delim)
break;
__str._M_string += __c;
}
while (true);
__is.setf(__flags);
return __is;
}
} // namespace __detail
_GLIBCXX_END_NAMESPACE_VERSION
} // namespace std
#endif // C++11
#endif /* _GLIBCXX_QUOTED_STRING_H */
sstream
c++0x_warning.h
std
ISO C++ entities toplevel namespace is std.
std::__detail::operator<<
std::basic_ostream< _CharT, _Traits > & operator<<(std::basic_ostream< _CharT, _Traits > &__os, const _Quoted_string< const _CharT *, _CharT > &__str)
Inserter for quoted strings.
Definition: quoted_string.h:93
std::__detail::operator>>
std::basic_istream< _CharT, _Traits > & operator>>(std::basic_istream< _CharT, _Traits > &__is, const _Quoted_string< basic_string< _CharT, _Traits, _Alloc > &, _CharT > &__str)
Extractor for delimited strings. The left and right delimiters can be different.
Definition: quoted_string.h:139
std::basic_ios::clear
void clear(iostate __state=goodbit)
[Re]sets the error state.
Definition: basic_ios.tcc:41
std::basic_ios::good
bool good() const
Fast error checking.
Definition: basic_ios.h:180
std::basic_istream
Template class basic_istream.
Definition: istream:59
std::basic_istream::unget
__istream_type & unget()
Unextracting the previous character.
Definition: istream.tcc:781
std::basic_ostream
Template class basic_ostream.
Definition: ostream:59
std::basic_ostringstream
Controlling output for std::string.
Definition: sstream:758
std::basic_ostringstream::str
__string_type str() const
Copying out the string buffer.
Definition: sstream:916
std::basic_string_view
A non-owning reference to a string.
Definition: string_view:99
std::is_reference
is_reference
Definition: type_traits:560
std::is_pointer
is_pointer
Definition: type_traits:451
std::basic_string
Managing sequences of characters and character-like objects.
Definition: basic_string.h:3175
std::ios_base::setf
fmtflags setf(fmtflags __fmtfl)
Setting new format flags.
Definition: ios_base.h:676
std::ios_base::skipws
static const fmtflags skipws
Skips leading white space before certain input operations.
Definition: ios_base.h:386
std::ios_base::flags
fmtflags flags() const
Access to format flags.
Definition: ios_base.h:649
std::__detail::_Quoted_string
Struct for delimited strings.
Definition: quoted_string.h:50