regex.h
Go to the documentation of this file.
// class template regex -*- C++ -*-
// Copyright (C) 2010-2013 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/regex.h
* This is an internal header file, included by other library headers.
* Do not attempt to use it directly. @headername{regex}
*/
namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION
/**
* @addtogroup regex
* @{
*/
/**
* @brief Class regex_traits. Describes aspects of a regular expression.
*
* A regular expression traits class that satisfies the requirements of
* section [28.7].
*
* The class %regex is parameterized around a set of related types and
* functions used to complete the definition of its semantics. This class
* satisfies the requirements of such a traits class.
*/
template<typename _Ch_type>
struct regex_traits
{
public:
typedef _Ch_type char_type;
typedef std::basic_string<char_type> string_type;
typedef std::locale locale_type;
private:
struct _RegexMask
{
typedef typename std::ctype<char_type>::mask _BaseType;
_BaseType _M_base;
unsigned char _M_extended;
static constexpr unsigned char _S_under = 1 << 0;
// FIXME: _S_blank should be removed in the future, when locale's complete.
static constexpr unsigned char _S_blank = 1 << 1;
static constexpr unsigned char _S_valid_mask = 0x3;
constexpr _RegexMask(_BaseType __base = 0,
unsigned char __extended = 0)
: _M_base(__base), _M_extended(__extended)
{ }
constexpr _RegexMask
operator&(_RegexMask __other) const
{
return _RegexMask(_M_base & __other._M_base,
_M_extended & __other._M_extended);
}
constexpr _RegexMask
operator|(_RegexMask __other) const
{
return _RegexMask(_M_base | __other._M_base,
_M_extended | __other._M_extended);
}
constexpr _RegexMask
operator^(_RegexMask __other) const
{
return _RegexMask(_M_base ^ __other._M_base,
_M_extended ^ __other._M_extended);
}
constexpr _RegexMask
operator~() const
{ return _RegexMask(~_M_base, ~_M_extended); }
constexpr _RegexMask&
operator&=(_RegexMask __other)
{ return *this = (*this) & __other; }
constexpr _RegexMask&
operator|=(_RegexMask __other)
{ return *this = (*this) | __other; }
constexpr _RegexMask&
operator^=(_RegexMask __other)
{ return *this = (*this) ^ __other; }
constexpr bool
operator==(_RegexMask __other) const
{
return (_M_extended & _S_valid_mask)
== (__other._M_extended & _S_valid_mask)
&& _M_base == __other._M_base;
}
constexpr bool
operator!=(_RegexMask __other) const
{ return !((*this) == __other); }
};
public:
typedef _RegexMask char_class_type;
public:
/**
* @brief Constructs a default traits object.
*/
regex_traits() { }
/**
* @brief Gives the length of a C-style string starting at @p __p.
*
* @param __p a pointer to the start of a character sequence.
*
* @returns the number of characters between @p *__p and the first
* default-initialized value of type @p char_type. In other words, uses
* the C-string algorithm for determining the length of a sequence of
* characters.
*/
static std::size_t
length(const char_type* __p)
{ return string_type::traits_type::length(__p); }
/**
* @brief Performs the identity translation.
*
* @param __c A character to the locale-specific character set.
*
* @returns __c.
*/
char_type
translate(char_type __c) const
{ return __c; }
/**
* @brief Translates a character into a case-insensitive equivalent.
*
* @param __c A character to the locale-specific character set.
*
* @returns the locale-specific lower-case equivalent of __c.
* @throws std::bad_cast if the imbued locale does not support the ctype
* facet.
*/
char_type
translate_nocase(char_type __c) const
{
typedef std::ctype<char_type> __ctype_type;
const __ctype_type& __fctyp(use_facet<__ctype_type>(_M_locale));
return __fctyp.tolower(__c);
}
/**
* @brief Gets a sort key for a character sequence.
*
* @param __first beginning of the character sequence.
* @param __last one-past-the-end of the character sequence.
*
* Returns a sort key for the character sequence designated by the
* iterator range [F1, F2) such that if the character sequence [G1, G2)
* sorts before the character sequence [H1, H2) then
* v.transform(G1, G2) < v.transform(H1, H2).
*
* What this really does is provide a more efficient way to compare a
* string to multiple other strings in locales with fancy collation
* rules and equivalence classes.
*
* @returns a locale-specific sort key equivalent to the input range.
*
* @throws std::bad_cast if the current locale does not have a collate
* facet.
*/
template<typename _Fwd_iter>
string_type
transform(_Fwd_iter __first, _Fwd_iter __last) const
{
typedef std::collate<char_type> __collate_type;
const __collate_type& __fclt(use_facet<__collate_type>(_M_locale));
string_type __s(__first, __last);
return __fclt.transform(__s.data(), __s.data() + __s.size());
}
/**
* @brief Gets a sort key for a character sequence, independent of case.
*
* @param __first beginning of the character sequence.
* @param __last one-past-the-end of the character sequence.
*
* Effects: if typeid(use_facet<collate<_Ch_type> >) ==
* typeid(collate_byname<_Ch_type>) and the form of the sort key
* returned by collate_byname<_Ch_type>::transform(__first, __last)
* is known and can be converted into a primary sort key
* then returns that key, otherwise returns an empty string.
*
* @todo Implement this function.
*/
template<typename _Fwd_iter>
string_type
transform_primary(_Fwd_iter __first, _Fwd_iter __last) const
{
__try
{
typedef std::ctype<char_type> __ctype_type;
const __ctype_type& __fctyp(use_facet<__ctype_type>(_M_locale));
std::vector<char_type> __v(__first, __last);
// FIXME : this is not entirely correct
__fctyp.tolower(&*__v.begin(), &*__v.end());
return this->transform(&*__v.begin(), &*__v.end());
}
__catch (...)
{
}
return string_type();
}
/**
* @brief Gets a collation element by name.
*
* @param __first beginning of the collation element name.
* @param __last one-past-the-end of the collation element name.
*
* @returns a sequence of one or more characters that represents the
* collating element consisting of the character sequence designated by
* the iterator range [__first, __last). Returns an empty string if the
* character sequence is not a valid collating element.
*/
template<typename _Fwd_iter>
string_type
lookup_collatename(_Fwd_iter __first, _Fwd_iter __last) const;
/**
* @brief Maps one or more characters to a named character
* classification.
*
* @param __first beginning of the character sequence.
* @param __last one-past-the-end of the character sequence.
* @param __icase ignores the case of the classification name.
*
* @returns an unspecified value that represents the character
* classification named by the character sequence designated by
* the iterator range [__first, __last). If @p icase is true,
* the returned mask identifies the classification regardless of
* the case of the characters to be matched (for example,
* [[:lower:]] is the same as [[:alpha:]]), otherwise a
* case-dependent classification is returned. The value
* returned shall be independent of the case of the characters
* in the character sequence. If the name is not recognized then
* returns a value that compares equal to 0.
*
* At least the following names (or their wide-character equivalent) are
* supported.
* - d
* - w
* - s
* - alnum
* - alpha
* - blank
* - cntrl
* - digit
* - graph
* - lower
* - print
* - punct
* - space
* - upper
* - xdigit
*/
template<typename _Fwd_iter>
char_class_type
lookup_classname(_Fwd_iter __first, _Fwd_iter __last,
bool __icase = false) const;
/**
* @brief Determines if @p c is a member of an identified class.
*
* @param __c a character.
* @param __f a class type (as returned from lookup_classname).
*
* @returns true if the character @p __c is a member of the classification
* represented by @p __f, false otherwise.
*
* @throws std::bad_cast if the current locale does not have a ctype
* facet.
*/
bool
isctype(_Ch_type __c, char_class_type __f) const;
/**
* @brief Converts a digit to an int.
*
* @param __ch a character representing a digit.
* @param __radix the radix if the numeric conversion (limited to 8, 10,
* or 16).
*
* @returns the value represented by the digit __ch in base radix if the
* character __ch is a valid digit in base radix; otherwise returns -1.
*/
int
value(_Ch_type __ch, int __radix) const;
/**
* @brief Imbues the regex_traits object with a copy of a new locale.
*
* @param __loc A locale.
*
* @returns a copy of the previous locale in use by the regex_traits
* object.
*
* @note Calling imbue with a different locale than the one currently in
* use invalidates all cached data held by *this.
*/
locale_type
imbue(locale_type __loc)
{
std::swap(_M_locale, __loc);
return __loc;
}
/**
* @brief Gets a copy of the current locale in use by the regex_traits
* object.
*/
locale_type
getloc() const
{ return _M_locale; }
protected:
locale_type _M_locale;
};
template<typename _Ch_type>
template<typename _Fwd_iter>
typename regex_traits<_Ch_type>::string_type
regex_traits<_Ch_type>::
lookup_collatename(_Fwd_iter __first, _Fwd_iter __last) const
{
typedef std::ctype<char_type> __ctype_type;
const __ctype_type& __fctyp(use_facet<__ctype_type>(_M_locale));
static const char* __collatenames[] =
{
"NUL",
"SOH",
"STX",
"ETX",
"EOT",
"ENQ",
"ACK",
"alert",
"backspace",
"tab",
"newline",
"vertical-tab",
"form-feed",
"carriage-return",
"SO",
"SI",
"DLE",
"DC1",
"DC2",
"DC3",
"DC4",
"NAK",
"SYN",
"ETB",
"CAN",
"EM",
"SUB",
"ESC",
"IS4",
"IS3",
"IS2",
"IS1",
"space",
"exclamation-mark",
"quotation-mark",
"number-sign",
"dollar-sign",
"percent-sign",
"ampersand",
"apostrophe",
"left-parenthesis",
"right-parenthesis",
"asterisk",
"plus-sign",
"comma",
"hyphen",
"period",
"slash",
"zero",
"one",
"two",
"three",
"four",
"five",
"six",
"seven",
"eight",
"nine",
"colon",
"semicolon",
"less-than-sign",
"equals-sign",
"greater-than-sign",
"question-mark",
"commercial-at",
"A",
"B",
"C",
"D",
"E",
"F",
"G",
"H",
"I",
"J",
"K",
"L",
"M",
"N",
"O",
"P",
"Q",
"R",
"S",
"T",
"U",
"V",
"W",
"X",
"Y",
"Z",
"left-square-bracket",
"backslash",
"right-square-bracket",
"circumflex",
"underscore",
"grave-accent",
"a",
"b",
"c",
"d",
"e",
"f",
"g",
"h",
"i",
"j",
"k",
"l",
"m",
"n",
"o",
"p",
"q",
"r",
"s",
"t",
"u",
"v",
"w",
"x",
"y",
"z",
"left-curly-bracket",
"vertical-line",
"right-curly-bracket",
"tilde",
"DEL",
""
};
// same as boost
static const char* __digraphs[] =
{
"ae",
"Ae",
"AE",
"ch",
"Ch",
"CH",
"ll",
"Ll",
"LL",
"ss",
"Ss",
"SS",
"nj",
"Nj",
"NJ",
"dz",
"Dz",
"DZ",
"lj",
"Lj",
"LJ",
""
};
std::string __s(__last - __first, '?');
string_type a(__first, __last);
__fctyp.narrow(__first, __last, '?', &*__s.begin());
for (unsigned int __i = 0; *__collatenames[__i]; __i++)
if (__s == __collatenames[__i])
return string_type(1, __fctyp.widen((char)__i));
for (unsigned int __i = 0; *__digraphs[__i]; __i++)
{
const char* __now = __digraphs[__i];
if (__s == __now)
{
string_type ret(__s.size(), __fctyp.widen('?'));
__fctyp.widen(__now, __now + 2/* ouch */, &*ret.begin());
return ret;
}
}
return string_type();
}
template<typename _Ch_type>
template<typename _Fwd_iter>
typename regex_traits<_Ch_type>::char_class_type
regex_traits<_Ch_type>::
lookup_classname(_Fwd_iter __first, _Fwd_iter __last, bool __icase) const
{
typedef std::ctype<char_type> __ctype_type;
typedef std::ctype<char> __cctype_type;
typedef const pair<const char*, char_class_type> _ClassnameEntry;
const __ctype_type& __fctyp(use_facet<__ctype_type>(_M_locale));
const __cctype_type& __cctyp(use_facet<__cctype_type>(_M_locale));
static _ClassnameEntry __classnames[] =
{
{"d", ctype_base::digit},
{"w", {ctype_base::alnum, _RegexMask::_S_under}},
{"s", ctype_base::space},
{"alnum", ctype_base::alnum},
{"alpha", ctype_base::alpha},
{"blank", {0, _RegexMask::_S_blank}},
{"cntrl", ctype_base::cntrl},
{"digit", ctype_base::digit},
{"graph", ctype_base::graph},
{"lower", ctype_base::lower},
{"print", ctype_base::print},
{"punct", ctype_base::punct},
{"space", ctype_base::space},
{"upper", ctype_base::upper},
{"xdigit", ctype_base::xdigit},
};
std::string __s(__last - __first, '?');
__fctyp.narrow(__first, __last, '?', &__s[0]);
__cctyp.tolower(&*__s.begin(), &*__s.end());
for (_ClassnameEntry* __it = __classnames;
__it < *(&__classnames + 1);
++__it)
{
if (__s == __it->first)
{
if (__icase
&& ((__it->second & (ctype_base::lower | ctype_base::upper)) != 0))
return ctype_base::alpha;
return __it->second;
}
}
return 0;
}
template<typename _Ch_type>
bool
regex_traits<_Ch_type>::
isctype(_Ch_type __c, char_class_type __f) const
{
typedef std::ctype<char_type> __ctype_type;
const __ctype_type& __fctyp(use_facet<__ctype_type>(_M_locale));
return __fctyp.is(__f._M_base, __c)
// [[:w:]]
|| ((__f._M_extended & _RegexMask::_S_under)
&& __c == __fctyp.widen('_'))
// [[:blank:]]
|| ((__f._M_extended & _RegexMask::_S_blank)
&& (__c == __fctyp.widen(' ')
|| __c == __fctyp.widen('\t')));
}
template<typename _Ch_type>
int
regex_traits<_Ch_type>::
value(_Ch_type __ch, int __radix) const
{
std::basic_istringstream<char_type> __is(string_type(1, __ch));
int __v;
if (__radix == 8)
__is >> std::oct;
else if (__radix == 16)
__is >> std::hex;
__is >> __v;
return __is.fail() ? -1 : __v;
}
// [7.8] Class basic_regex
/**
* Objects of specializations of this class represent regular expressions
* constructed from sequences of character type @p _Ch_type.
*
* Storage for the regular expression is allocated and deallocated as
* necessary by the member functions of this class.
*/
template<typename _Ch_type, typename _Rx_traits = regex_traits<_Ch_type> >
class basic_regex
{
public:
// types:
typedef _Ch_type value_type;
typedef _Rx_traits traits_type;
typedef typename traits_type::string_type string_type;
typedef regex_constants::syntax_option_type flag_type;
typedef typename traits_type::locale_type locale_type;
/**
* @name Constants
* std [28.8.1](1)
*/
//@{
static constexpr flag_type icase = regex_constants::icase;
static constexpr flag_type nosubs = regex_constants::nosubs;
static constexpr flag_type optimize = regex_constants::optimize;
static constexpr flag_type collate = regex_constants::collate;
static constexpr flag_type ECMAScript = regex_constants::ECMAScript;
static constexpr flag_type basic = regex_constants::basic;
static constexpr flag_type extended = regex_constants::extended;
static constexpr flag_type awk = regex_constants::awk;
static constexpr flag_type grep = regex_constants::grep;
static constexpr flag_type egrep = regex_constants::egrep;
//@}
// [7.8.2] construct/copy/destroy
/**
* Constructs a basic regular expression that does not match any
* character sequence.
*/
basic_regex()
: _M_flags(ECMAScript),
_M_automaton(__detail::__compile<const _Ch_type*, _Rx_traits>(0, 0,
_M_traits, _M_flags))
{ }
/**
* @brief Constructs a basic regular expression from the
* sequence [__p, __p + char_traits<_Ch_type>::length(__p))
* interpreted according to the flags in @p __f.
*
* @param __p A pointer to the start of a C-style null-terminated string
* containing a regular expression.
* @param __f Flags indicating the syntax rules and options.
*
* @throws regex_error if @p __p is not a valid regular expression.
*/
explicit
basic_regex(const _Ch_type* __p, flag_type __f = ECMAScript)
: _M_flags(__f),
_M_automaton(__detail::__compile(__p, __p + _Rx_traits::length(__p),
_M_traits, _M_flags))
{ }
/**
* @brief Constructs a basic regular expression from the sequence
* [p, p + len) interpreted according to the flags in @p f.
*
* @param __p A pointer to the start of a string containing a regular
* expression.
* @param __len The length of the string containing the regular
* expression.
* @param __f Flags indicating the syntax rules and options.
*
* @throws regex_error if @p __p is not a valid regular expression.
*/
basic_regex(const _Ch_type* __p, std::size_t __len, flag_type __f)
: _M_flags(__f),
_M_automaton(__detail::__compile(__p, __p + __len, _M_traits, _M_flags))
{ }
/**
* @brief Copy-constructs a basic regular expression.
*
* @param __rhs A @p regex object.
*/
basic_regex(const basic_regex& __rhs)
: _M_flags(__rhs._M_flags), _M_traits(__rhs._M_traits),
_M_automaton(__rhs._M_automaton)
{ }
/**
* @brief Move-constructs a basic regular expression.
*
* @param __rhs A @p regex object.
*/
basic_regex(const basic_regex&& __rhs) noexcept
: _M_flags(__rhs._M_flags), _M_traits(__rhs._M_traits),
_M_automaton(std::move(__rhs._M_automaton))
{ }
/**
* @brief Constructs a basic regular expression from the string
* @p s interpreted according to the flags in @p f.
*
* @param __s A string containing a regular expression.
* @param __f Flags indicating the syntax rules and options.
*
* @throws regex_error if @p __s is not a valid regular expression.
*/
template<typename _Ch_traits, typename _Ch_alloc>
explicit
basic_regex(const std::basic_string<_Ch_type, _Ch_traits,
_Ch_alloc>& __s,
flag_type __f = ECMAScript)
: _M_flags(__f),
_M_automaton(__detail::__compile(__s.begin(), __s.end(),
_M_traits, _M_flags))
{ }
/**
* @brief Constructs a basic regular expression from the range
* [first, last) interpreted according to the flags in @p f.
*
* @param __first The start of a range containing a valid regular
* expression.
* @param __last The end of a range containing a valid regular
* expression.
* @param __f The format flags of the regular expression.
*
* @throws regex_error if @p [__first, __last) is not a valid regular
* expression.
*/
template<typename _InputIterator>
basic_regex(_InputIterator __first, _InputIterator __last,
flag_type __f = ECMAScript)
: _M_flags(__f),
_M_automaton(__detail::__compile(__first, __last, _M_traits, _M_flags))
{ }
/**
* @brief Constructs a basic regular expression from an initializer list.
*
* @param __l The initializer list.
* @param __f The format flags of the regular expression.
*
* @throws regex_error if @p __l is not a valid regular expression.
*/
basic_regex(initializer_list<_Ch_type> __l,
flag_type __f = ECMAScript)
: _M_flags(__f),
_M_automaton(__detail::__compile(__l.begin(), __l.end(),
_M_traits, _M_flags))
{ }
/**
* @brief Destroys a basic regular expression.
*/
~basic_regex()
{ }
/**
* @brief Assigns one regular expression to another.
*/
basic_regex&
operator=(const basic_regex& __rhs)
{ return this->assign(__rhs); }
/**
* @brief Move-assigns one regular expression to another.
*/
basic_regex&
operator=(basic_regex&& __rhs) noexcept
{ return this->assign(std::move(__rhs)); }
/**
* @brief Replaces a regular expression with a new one constructed from
* a C-style null-terminated string.
*
* @param __p A pointer to the start of a null-terminated C-style string
* containing a regular expression.
*/
basic_regex&
operator=(const _Ch_type* __p)
{ return this->assign(__p, flags()); }
/**
* @brief Replaces a regular expression with a new one constructed from
* a string.
*
* @param __s A pointer to a string containing a regular expression.
*/
template<typename _Ch_typeraits, typename _Alloc>
basic_regex&
operator=(const basic_string<_Ch_type, _Ch_typeraits, _Alloc>& __s)
{ return this->assign(__s, flags()); }
// [7.8.3] assign
/**
* @brief the real assignment operator.
*
* @param __rhs Another regular expression object.
*/
basic_regex&
assign(const basic_regex& __rhs)
{
basic_regex __tmp(__rhs);
this->swap(__tmp);
return *this;
}
/**
* @brief The move-assignment operator.
*
* @param __rhs Another regular expression object.
*/
basic_regex&
assign(basic_regex&& __rhs) noexcept
{
basic_regex __tmp(std::move(__rhs));
this->swap(__tmp);
return *this;
}
/**
* @brief Assigns a new regular expression to a regex object from a
* C-style null-terminated string containing a regular expression
* pattern.
*
* @param __p A pointer to a C-style null-terminated string containing
* a regular expression pattern.
* @param __flags Syntax option flags.
*
* @throws regex_error if __p does not contain a valid regular
* expression pattern interpreted according to @p __flags. If
* regex_error is thrown, *this remains unchanged.
*/
basic_regex&
assign(const _Ch_type* __p, flag_type __flags = ECMAScript)
{ return this->assign(string_type(__p), __flags); }
/**
* @brief Assigns a new regular expression to a regex object from a
* C-style string containing a regular expression pattern.
*
* @param __p A pointer to a C-style string containing a
* regular expression pattern.
* @param __len The length of the regular expression pattern string.
* @param __flags Syntax option flags.
*
* @throws regex_error if p does not contain a valid regular
* expression pattern interpreted according to @p __flags. If
* regex_error is thrown, *this remains unchanged.
*/
basic_regex&
assign(const _Ch_type* __p, std::size_t __len, flag_type __flags)
{ return this->assign(string_type(__p, __len), __flags); }
/**
* @brief Assigns a new regular expression to a regex object from a
* string containing a regular expression pattern.
*
* @param __s A string containing a regular expression pattern.
* @param __flags Syntax option flags.
*
* @throws regex_error if __s does not contain a valid regular
* expression pattern interpreted according to @p __flags. If
* regex_error is thrown, *this remains unchanged.
*/
template<typename _Ch_typeraits, typename _Alloc>
basic_regex&
assign(const basic_string<_Ch_type, _Ch_typeraits, _Alloc>& __s,
flag_type __flags = ECMAScript)
{
basic_regex __tmp(__s, __flags);
this->swap(__tmp);
return *this;
}
/**
* @brief Assigns a new regular expression to a regex object.
*
* @param __first The start of a range containing a valid regular
* expression.
* @param __last The end of a range containing a valid regular
* expression.
* @param __flags Syntax option flags.
*
* @throws regex_error if p does not contain a valid regular
* expression pattern interpreted according to @p __flags. If
* regex_error is thrown, the object remains unchanged.
*/
template<typename _InputIterator>
basic_regex&
assign(_InputIterator __first, _InputIterator __last,
flag_type __flags = ECMAScript)
{ return this->assign(string_type(__first, __last), __flags); }
/**
* @brief Assigns a new regular expression to a regex object.
*
* @param __l An initializer list representing a regular expression.
* @param __flags Syntax option flags.
*
* @throws regex_error if @p __l does not contain a valid
* regular expression pattern interpreted according to @p
* __flags. If regex_error is thrown, the object remains
* unchanged.
*/
basic_regex&
assign(initializer_list<_Ch_type> __l, flag_type __flags = ECMAScript)
{ return this->assign(__l.begin(), __l.end(), __flags); }
// [7.8.4] const operations
/**
* @brief Gets the number of marked subexpressions within the regular
* expression.
*/
unsigned int
mark_count() const
{ return _M_automaton->_M_sub_count() - 1; }
/**
* @brief Gets the flags used to construct the regular expression
* or in the last call to assign().
*/
flag_type
flags() const
{ return _M_flags; }
// [7.8.5] locale
/**
* @brief Imbues the regular expression object with the given locale.
*
* @param __loc A locale.
*/
locale_type
imbue(locale_type __loc)
{ return _M_traits.imbue(__loc); }
/**
* @brief Gets the locale currently imbued in the regular expression
* object.
*/
locale_type
getloc() const
{ return _M_traits.getloc(); }
// [7.8.6] swap
/**
* @brief Swaps the contents of two regular expression objects.
*
* @param __rhs Another regular expression object.
*/
void
swap(basic_regex& __rhs)
{
std::swap(_M_flags, __rhs._M_flags);
std::swap(_M_traits, __rhs._M_traits);
std::swap(_M_automaton, __rhs._M_automaton);
}
#ifdef _GLIBCXX_DEBUG
void
_M_dot(std::ostream& __ostr)
{ _M_automaton->_M_dot(__ostr); }
#endif
const __detail::_AutomatonPtr&
_M_get_automaton() const
{ return _M_automaton; }
protected:
flag_type _M_flags;
_Rx_traits _M_traits;
__detail::_AutomatonPtr _M_automaton;
};
/** @brief Standard regular expressions. */
typedef basic_regex<char> regex;
#ifdef _GLIBCXX_USE_WCHAR_T
/** @brief Standard wide-character regular expressions. */
typedef basic_regex<wchar_t> wregex;
#endif
// [7.8.6] basic_regex swap
/**
* @brief Swaps the contents of two regular expression objects.
* @param __lhs First regular expression.
* @param __rhs Second regular expression.
*/
template<typename _Ch_type, typename _Rx_traits>
inline void
swap(basic_regex<_Ch_type, _Rx_traits>& __lhs,
basic_regex<_Ch_type, _Rx_traits>& __rhs)
{ __lhs.swap(__rhs); }
// [7.9] Class template sub_match
/**
* A sequence of characters matched by a particular marked sub-expression.
*
* An object of this class is essentially a pair of iterators marking a
* matched subexpression within a regular expression pattern match. Such
* objects can be converted to and compared with std::basic_string objects
* of a similar base character type as the pattern matched by the regular
* expression.
*
* The iterators that make up the pair are the usual half-open interval
* referencing the actual original pattern matched.
*/
template<typename _BiIter>
class sub_match : public std::pair<_BiIter, _BiIter>
{
typedef iterator_traits<_BiIter> __iter_traits;
public:
typedef typename __iter_traits::value_type value_type;
typedef typename __iter_traits::difference_type difference_type;
typedef _BiIter iterator;
typedef std::basic_string<value_type> string_type;
bool matched;
constexpr sub_match() : matched() { }
/**
* Gets the length of the matching sequence.
*/
difference_type
length() const
{ return this->matched ? std::distance(this->first, this->second) : 0; }
/**
* @brief Gets the matching sequence as a string.
*
* @returns the matching sequence as a string.
*
* This is the implicit conversion operator. It is identical to the
* str() member function except that it will want to pop up in
* unexpected places and cause a great deal of confusion and cursing
* from the unwary.
*/
operator string_type() const
{
return this->matched
? string_type(this->first, this->second)
: string_type();
}
/**
* @brief Gets the matching sequence as a string.
*
* @returns the matching sequence as a string.
*/
string_type
str() const
{
return this->matched
? string_type(this->first, this->second)
: string_type();
}
/**
* @brief Compares this and another matched sequence.
*
* @param __s Another matched sequence to compare to this one.
*
* @retval <0 this matched sequence will collate before @p __s.
* @retval =0 this matched sequence is equivalent to @p __s.
* @retval <0 this matched sequence will collate after @p __s.
*/
int
compare(const sub_match& __s) const
{ return this->str().compare(__s.str()); }
/**
* @brief Compares this sub_match to a string.
*
* @param __s A string to compare to this sub_match.
*
* @retval <0 this matched sequence will collate before @p __s.
* @retval =0 this matched sequence is equivalent to @p __s.
* @retval <0 this matched sequence will collate after @p __s.
*/
int
compare(const string_type& __s) const
{ return this->str().compare(__s); }
/**
* @brief Compares this sub_match to a C-style string.
*
* @param __s A C-style string to compare to this sub_match.
*
* @retval <0 this matched sequence will collate before @p __s.
* @retval =0 this matched sequence is equivalent to @p __s.
* @retval <0 this matched sequence will collate after @p __s.
*/
int
compare(const value_type* __s) const
{ return this->str().compare(__s); }
};
/** @brief Standard regex submatch over a C-style null-terminated string. */
typedef sub_match<const char*> csub_match;
/** @brief Standard regex submatch over a standard string. */
typedef sub_match<string::const_iterator> ssub_match;
#ifdef _GLIBCXX_USE_WCHAR_T
/** @brief Regex submatch over a C-style null-terminated wide string. */
typedef sub_match<const wchar_t*> wcsub_match;
/** @brief Regex submatch over a standard wide string. */
typedef sub_match<wstring::const_iterator> wssub_match;
#endif
// [7.9.2] sub_match non-member operators
/**
* @brief Tests the equivalence of two regular expression submatches.
* @param __lhs First regular expression submatch.
* @param __rhs Second regular expression submatch.
* @returns true if @a __lhs is equivalent to @a __rhs, false otherwise.
*/
template<typename _BiIter>
inline bool
operator==(const sub_match<_BiIter>& __lhs, const sub_match<_BiIter>& __rhs)
{ return __lhs.compare(__rhs) == 0; }
/**
* @brief Tests the inequivalence of two regular expression submatches.
* @param __lhs First regular expression submatch.
* @param __rhs Second regular expression submatch.
* @returns true if @a __lhs is not equivalent to @a __rhs, false otherwise.
*/
template<typename _BiIter>
inline bool
operator!=(const sub_match<_BiIter>& __lhs, const sub_match<_BiIter>& __rhs)
{ return __lhs.compare(__rhs) != 0; }
/**
* @brief Tests the ordering of two regular expression submatches.
* @param __lhs First regular expression submatch.
* @param __rhs Second regular expression submatch.
* @returns true if @a __lhs precedes @a __rhs, false otherwise.
*/
template<typename _BiIter>
inline bool
operator<(const sub_match<_BiIter>& __lhs, const sub_match<_BiIter>& __rhs)
{ return __lhs.compare(__rhs) < 0; }
/**
* @brief Tests the ordering of two regular expression submatches.
* @param __lhs First regular expression submatch.
* @param __rhs Second regular expression submatch.
* @returns true if @a __lhs does not succeed @a __rhs, false otherwise.
*/
template<typename _BiIter>
inline bool
operator<=(const sub_match<_BiIter>& __lhs, const sub_match<_BiIter>& __rhs)
{ return __lhs.compare(__rhs) <= 0; }
/**
* @brief Tests the ordering of two regular expression submatches.
* @param __lhs First regular expression submatch.
* @param __rhs Second regular expression submatch.
* @returns true if @a __lhs does not precede @a __rhs, false otherwise.
*/
template<typename _BiIter>
inline bool
operator>=(const sub_match<_BiIter>& __lhs, const sub_match<_BiIter>& __rhs)
{ return __lhs.compare(__rhs) >= 0; }
/**
* @brief Tests the ordering of two regular expression submatches.
* @param __lhs First regular expression submatch.
* @param __rhs Second regular expression submatch.
* @returns true if @a __lhs succeeds @a __rhs, false otherwise.
*/
template<typename _BiIter>
inline bool
operator>(const sub_match<_BiIter>& __lhs, const sub_match<_BiIter>& __rhs)
{ return __lhs.compare(__rhs) > 0; }
// Alias for sub_match'd string.
template<typename _Bi_iter, typename _Ch_traits, typename _Ch_alloc>
using __sub_match_string = basic_string<
typename iterator_traits<_Bi_iter>::value_type,
_Ch_traits, _Ch_alloc>;
/**
* @brief Tests the equivalence of a string and a regular expression
* submatch.
* @param __lhs A string.
* @param __rhs A regular expression submatch.
* @returns true if @a __lhs is equivalent to @a __rhs, false otherwise.
*/
template<typename _Bi_iter, typename _Ch_traits, typename _Ch_alloc>
inline bool
operator==(const __sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>& __lhs,
const sub_match<_Bi_iter>& __rhs)
{ return __rhs.compare(__lhs.c_str()) == 0; }
/**
* @brief Tests the inequivalence of a string and a regular expression
* submatch.
* @param __lhs A string.
* @param __rhs A regular expression submatch.
* @returns true if @a __lhs is not equivalent to @a __rhs, false otherwise.
*/
template<typename _Bi_iter, typename _Ch_traits, typename _Ch_alloc>
inline bool
operator!=(const __sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>& __lhs,
const sub_match<_Bi_iter>& __rhs)
{ return !(__lhs == __rhs); }
/**
* @brief Tests the ordering of a string and a regular expression submatch.
* @param __lhs A string.
* @param __rhs A regular expression submatch.
* @returns true if @a __lhs precedes @a __rhs, false otherwise.
*/
template<typename _Bi_iter, typename _Ch_traits, typename _Ch_alloc>
inline bool
operator<(const __sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>& __lhs,
const sub_match<_Bi_iter>& __rhs)
{ return __rhs.compare(__lhs.c_str()) > 0; }
/**
* @brief Tests the ordering of a string and a regular expression submatch.
* @param __lhs A string.
* @param __rhs A regular expression submatch.
* @returns true if @a __lhs succeeds @a __rhs, false otherwise.
*/
template<typename _Bi_iter, typename _Ch_traits, typename _Ch_alloc>
inline bool
operator>(const __sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>& __lhs,
const sub_match<_Bi_iter>& __rhs)
{ return __rhs < __lhs; }
/**
* @brief Tests the ordering of a string and a regular expression submatch.
* @param __lhs A string.
* @param __rhs A regular expression submatch.
* @returns true if @a __lhs does not precede @a __rhs, false otherwise.
*/
template<typename _Bi_iter, typename _Ch_traits, typename _Ch_alloc>
inline bool
operator>=(const __sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>& __lhs,
const sub_match<_Bi_iter>& __rhs)
{ return !(__lhs < __rhs); }
/**
* @brief Tests the ordering of a string and a regular expression submatch.
* @param __lhs A string.
* @param __rhs A regular expression submatch.
* @returns true if @a __lhs does not succeed @a __rhs, false otherwise.
*/
template<typename _Bi_iter, typename _Ch_traits, typename _Ch_alloc>
inline bool
operator<=(const __sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>& __lhs,
const sub_match<_Bi_iter>& __rhs)
{ return !(__rhs < __lhs); }
/**
* @brief Tests the equivalence of a regular expression submatch and a
* string.
* @param __lhs A regular expression submatch.
* @param __rhs A string.
* @returns true if @a __lhs is equivalent to @a __rhs, false otherwise.
*/
template<typename _Bi_iter, typename _Ch_traits, typename _Ch_alloc>
inline bool
operator==(const sub_match<_Bi_iter>& __lhs,
const __sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>& __rhs)
{ return __lhs.compare(__rhs.c_str()) == 0; }
/**
* @brief Tests the inequivalence of a regular expression submatch and a
* string.
* @param __lhs A regular expression submatch.
* @param __rhs A string.
* @returns true if @a __lhs is not equivalent to @a __rhs, false otherwise.
*/
template<typename _Bi_iter, typename _Ch_traits, typename _Ch_alloc>
inline bool
operator!=(const sub_match<_Bi_iter>& __lhs,
const __sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>& __rhs)
{ return !(__lhs == __rhs); }
/**
* @brief Tests the ordering of a regular expression submatch and a string.
* @param __lhs A regular expression submatch.
* @param __rhs A string.
* @returns true if @a __lhs precedes @a __rhs, false otherwise.
*/
template<typename _Bi_iter, class _Ch_traits, class _Ch_alloc>
inline bool
operator<(const sub_match<_Bi_iter>& __lhs,
const __sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>& __rhs)
{ return __lhs.compare(__rhs.c_str()) < 0; }
/**
* @brief Tests the ordering of a regular expression submatch and a string.
* @param __lhs A regular expression submatch.
* @param __rhs A string.
* @returns true if @a __lhs succeeds @a __rhs, false otherwise.
*/
template<typename _Bi_iter, class _Ch_traits, class _Ch_alloc>
inline bool
operator>(const sub_match<_Bi_iter>& __lhs,
const __sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>& __rhs)
{ return __rhs < __lhs; }
/**
* @brief Tests the ordering of a regular expression submatch and a string.
* @param __lhs A regular expression submatch.
* @param __rhs A string.
* @returns true if @a __lhs does not precede @a __rhs, false otherwise.
*/
template<typename _Bi_iter, class _Ch_traits, class _Ch_alloc>
inline bool
operator>=(const sub_match<_Bi_iter>& __lhs,
const __sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>& __rhs)
{ return !(__lhs < __rhs); }
/**
* @brief Tests the ordering of a regular expression submatch and a string.
* @param __lhs A regular expression submatch.
* @param __rhs A string.
* @returns true if @a __lhs does not succeed @a __rhs, false otherwise.
*/
template<typename _Bi_iter, class _Ch_traits, class _Ch_alloc>
inline bool
operator<=(const sub_match<_Bi_iter>& __lhs,
const __sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>& __rhs)
{ return !(__rhs < __lhs); }
/**
* @brief Tests the equivalence of a C string and a regular expression
* submatch.
* @param __lhs A C string.
* @param __rhs A regular expression submatch.
* @returns true if @a __lhs is equivalent to @a __rhs, false otherwise.
*/
template<typename _Bi_iter>
inline bool
operator==(typename iterator_traits<_Bi_iter>::value_type const* __lhs,
const sub_match<_Bi_iter>& __rhs)
{ return __rhs.compare(__lhs) == 0; }
/**
* @brief Tests the inequivalence of an iterator value and a regular
* expression submatch.
* @param __lhs A regular expression submatch.
* @param __rhs A string.
* @returns true if @a __lhs is not equivalent to @a __rhs, false otherwise.
*/
template<typename _Bi_iter>
inline bool
operator!=(typename iterator_traits<_Bi_iter>::value_type const* __lhs,
const sub_match<_Bi_iter>& __rhs)
{ return !(__lhs == __rhs); }
/**
* @brief Tests the ordering of a string and a regular expression submatch.
* @param __lhs A string.
* @param __rhs A regular expression submatch.
* @returns true if @a __lhs precedes @a __rhs, false otherwise.
*/
template<typename _Bi_iter>
inline bool
operator<(typename iterator_traits<_Bi_iter>::value_type const* __lhs,
const sub_match<_Bi_iter>& __rhs)
{ return __rhs.compare(__lhs) > 0; }
/**
* @brief Tests the ordering of a string and a regular expression submatch.
* @param __lhs A string.
* @param __rhs A regular expression submatch.
* @returns true if @a __lhs succeeds @a __rhs, false otherwise.
*/
template<typename _Bi_iter>
inline bool
operator>(typename iterator_traits<_Bi_iter>::value_type const* __lhs,
const sub_match<_Bi_iter>& __rhs)
{ return __rhs < __lhs; }
/**
* @brief Tests the ordering of a string and a regular expression submatch.
* @param __lhs A string.
* @param __rhs A regular expression submatch.
* @returns true if @a __lhs does not precede @a __rhs, false otherwise.
*/
template<typename _Bi_iter>
inline bool
operator>=(typename iterator_traits<_Bi_iter>::value_type const* __lhs,
const sub_match<_Bi_iter>& __rhs)
{ return !(__lhs < __rhs); }
/**
* @brief Tests the ordering of a string and a regular expression submatch.
* @param __lhs A string.
* @param __rhs A regular expression submatch.
* @returns true if @a __lhs does not succeed @a __rhs, false otherwise.
*/
template<typename _Bi_iter>
inline bool
operator<=(typename iterator_traits<_Bi_iter>::value_type const* __lhs,
const sub_match<_Bi_iter>& __rhs)
{ return !(__rhs < __lhs); }
/**
* @brief Tests the equivalence of a regular expression submatch and a
* string.
* @param __lhs A regular expression submatch.
* @param __rhs A pointer to a string?
* @returns true if @a __lhs is equivalent to @a __rhs, false otherwise.
*/
template<typename _Bi_iter>
inline bool
operator==(const sub_match<_Bi_iter>& __lhs,
typename iterator_traits<_Bi_iter>::value_type const* __rhs)
{ return __lhs.compare(__rhs) == 0; }
/**
* @brief Tests the inequivalence of a regular expression submatch and a
* string.
* @param __lhs A regular expression submatch.
* @param __rhs A pointer to a string.
* @returns true if @a __lhs is not equivalent to @a __rhs, false otherwise.
*/
template<typename _Bi_iter>
inline bool
operator!=(const sub_match<_Bi_iter>& __lhs,
typename iterator_traits<_Bi_iter>::value_type const* __rhs)
{ return !(__lhs == __rhs); }
/**
* @brief Tests the ordering of a regular expression submatch and a string.
* @param __lhs A regular expression submatch.
* @param __rhs A string.
* @returns true if @a __lhs precedes @a __rhs, false otherwise.
*/
template<typename _Bi_iter>
inline bool
operator<(const sub_match<_Bi_iter>& __lhs,
typename iterator_traits<_Bi_iter>::value_type const* __rhs)
{ return __lhs.compare(__rhs) < 0; }
/**
* @brief Tests the ordering of a regular expression submatch and a string.
* @param __lhs A regular expression submatch.
* @param __rhs A string.
* @returns true if @a __lhs succeeds @a __rhs, false otherwise.
*/
template<typename _Bi_iter>
inline bool
operator>(const sub_match<_Bi_iter>& __lhs,
typename iterator_traits<_Bi_iter>::value_type const* __rhs)
{ return __rhs < __lhs; }
/**
* @brief Tests the ordering of a regular expression submatch and a string.
* @param __lhs A regular expression submatch.
* @param __rhs A string.
* @returns true if @a __lhs does not precede @a __rhs, false otherwise.
*/
template<typename _Bi_iter>
inline bool
operator>=(const sub_match<_Bi_iter>& __lhs,
typename iterator_traits<_Bi_iter>::value_type const* __rhs)
{ return !(__lhs < __rhs); }
/**
* @brief Tests the ordering of a regular expression submatch and a string.
* @param __lhs A regular expression submatch.
* @param __rhs A string.
* @returns true if @a __lhs does not succeed @a __rhs, false otherwise.
*/
template<typename _Bi_iter>
inline bool
operator<=(const sub_match<_Bi_iter>& __lhs,
typename iterator_traits<_Bi_iter>::value_type const* __rhs)
{ return !(__rhs < __lhs); }
/**
* @brief Tests the equivalence of a string and a regular expression
* submatch.
* @param __lhs A string.
* @param __rhs A regular expression submatch.
* @returns true if @a __lhs is equivalent to @a __rhs, false otherwise.
*/
template<typename _Bi_iter>
inline bool
operator==(typename iterator_traits<_Bi_iter>::value_type const& __lhs,
const sub_match<_Bi_iter>& __rhs)
{
typedef typename sub_match<_Bi_iter>::string_type string_type;
return __rhs.compare(string_type(1, __lhs)) == 0;
}
/**
* @brief Tests the inequivalence of a string and a regular expression
* submatch.
* @param __lhs A string.
* @param __rhs A regular expression submatch.
* @returns true if @a __lhs is not equivalent to @a __rhs, false otherwise.
*/
template<typename _Bi_iter>
inline bool
operator!=(typename iterator_traits<_Bi_iter>::value_type const& __lhs,
const sub_match<_Bi_iter>& __rhs)
{ return !(__lhs == __rhs); }
/**
* @brief Tests the ordering of a string and a regular expression submatch.
* @param __lhs A string.
* @param __rhs A regular expression submatch.
* @returns true if @a __lhs precedes @a __rhs, false otherwise.
*/
template<typename _Bi_iter>
inline bool
operator<(typename iterator_traits<_Bi_iter>::value_type const& __lhs,
const sub_match<_Bi_iter>& __rhs)
{
typedef typename sub_match<_Bi_iter>::string_type string_type;
return __rhs.compare(string_type(1, __lhs)) > 0;
}
/**
* @brief Tests the ordering of a string and a regular expression submatch.
* @param __lhs A string.
* @param __rhs A regular expression submatch.
* @returns true if @a __lhs succeeds @a __rhs, false otherwise.
*/
template<typename _Bi_iter>
inline bool
operator>(typename iterator_traits<_Bi_iter>::value_type const& __lhs,
const sub_match<_Bi_iter>& __rhs)
{ return __rhs < __lhs; }
/**
* @brief Tests the ordering of a string and a regular expression submatch.
* @param __lhs A string.
* @param __rhs A regular expression submatch.
* @returns true if @a __lhs does not precede @a __rhs, false otherwise.
*/
template<typename _Bi_iter>
inline bool
operator>=(typename iterator_traits<_Bi_iter>::value_type const& __lhs,
const sub_match<_Bi_iter>& __rhs)
{ return !(__lhs < __rhs); }
/**
* @brief Tests the ordering of a string and a regular expression submatch.
* @param __lhs A string.
* @param __rhs A regular expression submatch.
* @returns true if @a __lhs does not succeed @a __rhs, false otherwise.
*/
template<typename _Bi_iter>
inline bool
operator<=(typename iterator_traits<_Bi_iter>::value_type const& __lhs,
const sub_match<_Bi_iter>& __rhs)
{ return !(__rhs < __lhs); }
/**
* @brief Tests the equivalence of a regular expression submatch and a
* string.
* @param __lhs A regular expression submatch.
* @param __rhs A const string reference.
* @returns true if @a __lhs is equivalent to @a __rhs, false otherwise.
*/
template<typename _Bi_iter>
inline bool
operator==(const sub_match<_Bi_iter>& __lhs,
typename iterator_traits<_Bi_iter>::value_type const& __rhs)
{
typedef typename sub_match<_Bi_iter>::string_type string_type;
return __lhs.compare(string_type(1, __rhs)) == 0;
}
/**
* @brief Tests the inequivalence of a regular expression submatch and a
* string.
* @param __lhs A regular expression submatch.
* @param __rhs A const string reference.
* @returns true if @a __lhs is not equivalent to @a __rhs, false otherwise.
*/
template<typename _Bi_iter>
inline bool
operator!=(const sub_match<_Bi_iter>& __lhs,
typename iterator_traits<_Bi_iter>::value_type const& __rhs)
{ return !(__lhs == __rhs); }
/**
* @brief Tests the ordering of a regular expression submatch and a string.
* @param __lhs A regular expression submatch.
* @param __rhs A const string reference.
* @returns true if @a __lhs precedes @a __rhs, false otherwise.
*/
template<typename _Bi_iter>
inline bool
operator<(const sub_match<_Bi_iter>& __lhs,
typename iterator_traits<_Bi_iter>::value_type const& __rhs)
{
typedef typename sub_match<_Bi_iter>::string_type string_type;
return __lhs.compare(string_type(1, __rhs)) < 0;
}
/**
* @brief Tests the ordering of a regular expression submatch and a string.
* @param __lhs A regular expression submatch.
* @param __rhs A const string reference.
* @returns true if @a __lhs succeeds @a __rhs, false otherwise.
*/
template<typename _Bi_iter>
inline bool
operator>(const sub_match<_Bi_iter>& __lhs,
typename iterator_traits<_Bi_iter>::value_type const& __rhs)
{ return __rhs < __lhs; }
/**
* @brief Tests the ordering of a regular expression submatch and a string.
* @param __lhs A regular expression submatch.
* @param __rhs A const string reference.
* @returns true if @a __lhs does not precede @a __rhs, false otherwise.
*/
template<typename _Bi_iter>
inline bool
operator>=(const sub_match<_Bi_iter>& __lhs,
typename iterator_traits<_Bi_iter>::value_type const& __rhs)
{ return !(__lhs < __rhs); }
/**
* @brief Tests the ordering of a regular expression submatch and a string.
* @param __lhs A regular expression submatch.
* @param __rhs A const string reference.
* @returns true if @a __lhs does not succeed @a __rhs, false otherwise.
*/
template<typename _Bi_iter>
inline bool
operator<=(const sub_match<_Bi_iter>& __lhs,
typename iterator_traits<_Bi_iter>::value_type const& __rhs)
{ return !(__rhs < __lhs); }
/**
* @brief Inserts a matched string into an output stream.
*
* @param __os The output stream.
* @param __m A submatch string.
*
* @returns the output stream with the submatch string inserted.
*/
template<typename _Ch_type, typename _Ch_traits, typename _Bi_iter>
inline
basic_ostream<_Ch_type, _Ch_traits>&
operator<<(basic_ostream<_Ch_type, _Ch_traits>& __os,
const sub_match<_Bi_iter>& __m)
{ return __os << __m.str(); }
// [7.10] Class template match_results
/*
* Special sub_match object representing an unmatched sub-expression.
*/
template<typename _Bi_iter>
inline const sub_match<_Bi_iter>&
__unmatched_sub()
{
static const sub_match<_Bi_iter> __unmatched = sub_match<_Bi_iter>();
return __unmatched;
}
/**
* @brief The results of a match or search operation.
*
* A collection of character sequences representing the result of a regular
* expression match. Storage for the collection is allocated and freed as
* necessary by the member functions of class template match_results.
*
* This class satisfies the Sequence requirements, with the exception that
* only the operations defined for a const-qualified Sequence are supported.
*
* The sub_match object stored at index 0 represents sub-expression 0, i.e.
* the whole match. In this case the %sub_match member matched is always true.
* The sub_match object stored at index n denotes what matched the marked
* sub-expression n within the matched expression. If the sub-expression n
* participated in a regular expression match then the %sub_match member
* matched evaluates to true, and members first and second denote the range
* of characters [first, second) which formed that match. Otherwise matched
* is false, and members first and second point to the end of the sequence
* that was searched.
*
* @nosubgrouping
*/
template<typename _Bi_iter,
typename _Alloc = allocator<sub_match<_Bi_iter> > >
class match_results
: private std::vector<sub_match<_Bi_iter>, _Alloc>
{
private:
/*
* The vector base is empty if this does not represent a successful match.
* Otherwise it contains n+3 elements where n is the number of marked
* sub-expressions:
* [0] entire match
* [1] 1st marked subexpression
* ...
* [n] nth marked subexpression
* [n+1] prefix
* [n+2] suffix
*/
typedef std::vector<sub_match<_Bi_iter>, _Alloc> _Base_type;
typedef std::iterator_traits<_Bi_iter> __iter_traits;
typedef regex_constants::match_flag_type match_flag_type;
public:
/**
* @name 10.? Public Types
*/
//@{
typedef _Alloc allocator_type;
typedef sub_match<_Bi_iter> value_type;
typedef const value_type& const_reference;
typedef const_reference reference;
typedef typename _Base_type::const_iterator const_iterator;
typedef const_iterator iterator;
typedef typename __iter_traits::difference_type difference_type;
typedef typename __iter_traits::value_type char_type;
typedef typename allocator_traits<_Alloc>::size_type size_type;
typedef std::basic_string<char_type> string_type;
//@}
public:
/**
* @name 28.10.1 Construction, Copying, and Destruction
*/
//@{
/**
* @brief Constructs a default %match_results container.
* @post size() returns 0 and str() returns an empty string.
*/
explicit
match_results(const _Alloc& __a = _Alloc())
: _Base_type(__a)
{ }
/**
* @brief Copy constructs a %match_results.
*/
match_results(const match_results& __rhs)
: _Base_type(__rhs)
{ }
/**
* @brief Move constructs a %match_results.
*/
match_results(match_results&& __rhs) noexcept
: _Base_type(std::move(__rhs))
{ }
/**
* @brief Assigns rhs to *this.
*/
match_results&
operator=(const match_results& __rhs)
{
match_results(__rhs).swap(*this);
return *this;
}
/**
* @brief Move-assigns rhs to *this.
*/
match_results&
operator=(match_results&& __rhs)
{
match_results(std::move(__rhs)).swap(*this);
return *this;
}
/**
* @brief Destroys a %match_results object.
*/
~match_results()
{ }
//@}
// 28.10.2, state:
/**
* @brief Indicates if the %match_results is ready.
* @retval true The object has a fully-established result state.
* @retval false The object is not ready.
*/
bool ready() const { return !_Base_type::empty(); }
/**
* @name 28.10.2 Size
*/
//@{
/**
* @brief Gets the number of matches and submatches.
*
* The number of matches for a given regular expression will be either 0
* if there was no match or mark_count() + 1 if a match was successful.
* Some matches may be empty.
*
* @returns the number of matches found.
*/
size_type
size() const
{
size_type __size = _Base_type::size();
return (__size && _Base_type::operator[](0).matched) ? __size - 2 : 0;
}
size_type
max_size() const
{ return _Base_type::max_size(); }
/**
* @brief Indicates if the %match_results contains no results.
* @retval true The %match_results object is empty.
* @retval false The %match_results object is not empty.
*/
bool
empty() const
{ return size() == 0; }
//@}
/**
* @name 10.3 Element Access
*/
//@{
/**
* @brief Gets the length of the indicated submatch.
* @param __sub indicates the submatch.
* @pre ready() == true
*
* This function returns the length of the indicated submatch, or the
* length of the entire match if @p __sub is zero (the default).
*/
difference_type
length(size_type __sub = 0) const
{ return (*this)[__sub].length(); }
/**
* @brief Gets the offset of the beginning of the indicated submatch.
* @param __sub indicates the submatch.
* @pre ready() == true
*
* This function returns the offset from the beginning of the target
* sequence to the beginning of the submatch, unless the value of @p __sub
* is zero (the default), in which case this function returns the offset
* from the beginning of the target sequence to the beginning of the
* match.
*
* Returns -1 if @p __sub is out of range.
*/
difference_type
position(size_type __sub = 0) const
{
return __sub < size() ? std::distance(this->prefix().first,
(*this)[__sub].first) : -1;
}
/**
* @brief Gets the match or submatch converted to a string type.
* @param __sub indicates the submatch.
* @pre ready() == true
*
* This function gets the submatch (or match, if @p __sub is
* zero) extracted from the target range and converted to the
* associated string type.
*/
string_type
str(size_type __sub = 0) const
{ return (*this)[__sub].str(); }
/**
* @brief Gets a %sub_match reference for the match or submatch.
* @param __sub indicates the submatch.
* @pre ready() == true
*
* This function gets a reference to the indicated submatch, or
* the entire match if @p __sub is zero.
*
* If @p __sub >= size() then this function returns a %sub_match with a
* special value indicating no submatch.
*/
const_reference
operator[](size_type __sub) const
{
_GLIBCXX_DEBUG_ASSERT( ready() );
return __sub < size()
? _Base_type::operator[](__sub)
: __unmatched_sub<_Bi_iter>();
}
/**
* @brief Gets a %sub_match representing the match prefix.
* @pre ready() == true
*
* This function gets a reference to a %sub_match object representing the
* part of the target range between the start of the target range and the
* start of the match.
*/
const_reference
prefix() const
{
_GLIBCXX_DEBUG_ASSERT( ready() );
return !empty()
? _Base_type::operator[](_Base_type::size() - 2)
: __unmatched_sub<_Bi_iter>();
}
/**
* @brief Gets a %sub_match representing the match suffix.
* @pre ready() == true
*
* This function gets a reference to a %sub_match object representing the
* part of the target range between the end of the match and the end of
* the target range.
*/
const_reference
suffix() const
{
_GLIBCXX_DEBUG_ASSERT( ready() );
return !empty()
? _Base_type::operator[](_Base_type::size() - 1)
: __unmatched_sub<_Bi_iter>();
}
/**
* @brief Gets an iterator to the start of the %sub_match collection.
*/
const_iterator
begin() const
{ return _Base_type::begin(); }
/**
* @brief Gets an iterator to the start of the %sub_match collection.
*/
const_iterator
cbegin() const
{ return _Base_type::cbegin(); }
/**
* @brief Gets an iterator to one-past-the-end of the collection.
*/
const_iterator
end() const
{ return !empty() ? _Base_type::end() - 2 : _Base_type::end(); }
/**
* @brief Gets an iterator to one-past-the-end of the collection.
*/
const_iterator
cend() const
{ return end(); }
//@}
/**
* @name 10.4 Formatting
*
* These functions perform formatted substitution of the matched
* character sequences into their target. The format specifiers and
* escape sequences accepted by these functions are determined by
* their @p flags parameter as documented above.
*/
//@{
/**
* @pre ready() == true
* @todo Implement this function.
*/
template<typename _Out_iter>
_Out_iter
format(_Out_iter __out, const char_type* __fmt_first,
const char_type* __fmt_last,
match_flag_type __flags = regex_constants::format_default) const
{ return __out; }
/**
* @pre ready() == true
*/
template<typename _Out_iter, typename _St, typename _Sa>
_Out_iter
format(_Out_iter __out, const basic_string<char_type, _St, _Sa>& __fmt,
match_flag_type __flags = regex_constants::format_default) const
{
return format(__out, __fmt.data(), __fmt.data() + __fmt.size(),
__flags);
}
/**
* @pre ready() == true
*/
template<typename _Out_iter, typename _St, typename _Sa>
basic_string<char_type, _St, _Sa>
format(const basic_string<char_type, _St, _Sa>& __fmt,
match_flag_type __flags = regex_constants::format_default) const
{
basic_string<char_type, _St, _Sa> __result;
format(std::back_inserter(__result), __fmt, __flags);
return __result;
}
/**
* @pre ready() == true
*/
string_type
format(const char_type* __fmt,
match_flag_type __flags = regex_constants::format_default) const
{
string_type __result;
format(std::back_inserter(__result),
__fmt + char_traits<char_type>::length(__fmt),
__flags);
return __result;
}
//@}
/**
* @name 10.5 Allocator
*/
//@{
/**
* @brief Gets a copy of the allocator.
*/
allocator_type
get_allocator() const
{ return _Base_type::get_allocator(); }
//@}
/**
* @name 10.6 Swap
*/
//@{
/**
* @brief Swaps the contents of two match_results.
*/
void
swap(match_results& __that)
{ _Base_type::swap(__that); }
//@}
private:
friend class __detail::_SpecializedResults<_Bi_iter, _Alloc>;
};
typedef match_results<const char*> cmatch;
typedef match_results<string::const_iterator> smatch;
#ifdef _GLIBCXX_USE_WCHAR_T
typedef match_results<const wchar_t*> wcmatch;
typedef match_results<wstring::const_iterator> wsmatch;
#endif
// match_results comparisons
/**
* @brief Compares two match_results for equality.
* @returns true if the two objects refer to the same match,
* false otherwise.
*/
template<typename _Bi_iter, typename _Alloc>
inline bool
operator==(const match_results<_Bi_iter, _Alloc>& __m1,
const match_results<_Bi_iter, _Alloc>& __m2)
{
if (__m1.ready() != __m2.ready())
return false;
if (!__m1.ready()) // both are not ready
return true;
if (__m1.empty() != __m2.empty())
return false;
if (__m1.empty()) // both are empty
return true;
return __m1.prefix() == __m2.prefix()
&& __m1.size() == __m2.size()
&& std::equal(__m1.begin(), __m1.end(), __m2.begin())
&& __m1.suffix() == __m2.suffix();
}
/**
* @brief Compares two match_results for inequality.
* @returns true if the two objects do not refer to the same match,
* false otherwise.
*/
template<typename _Bi_iter, class _Alloc>
inline bool
operator!=(const match_results<_Bi_iter, _Alloc>& __m1,
const match_results<_Bi_iter, _Alloc>& __m2)
{ return !(__m1 == __m2); }
// [7.10.6] match_results swap
/**
* @brief Swaps two match results.
* @param __lhs A match result.
* @param __rhs A match result.
*
* The contents of the two match_results objects are swapped.
*/
template<typename _Bi_iter, typename _Alloc>
inline void
swap(match_results<_Bi_iter, _Alloc>& __lhs,
match_results<_Bi_iter, _Alloc>& __rhs)
{ __lhs.swap(__rhs); }
// [7.11.2] Function template regex_match
/**
* @name Matching, Searching, and Replacing
*/
//@{
/**
* @brief Determines if there is a match between the regular expression @p e
* and all of the character sequence [first, last).
*
* @param __s Start of the character sequence to match.
* @param __e One-past-the-end of the character sequence to match.
* @param __m The match results.
* @param __re The regular expression.
* @param __flags Controls how the regular expression is matched.
*
* @retval true A match exists.
* @retval false Otherwise.
*
* @throws an exception of type regex_error.
*
* @todo Implement this function.
*/
template<typename _Bi_iter, typename _Alloc,
typename _Ch_type, typename _Rx_traits>
bool
regex_match(_Bi_iter __s,
_Bi_iter __e,
match_results<_Bi_iter, _Alloc>& __m,
const basic_regex<_Ch_type, _Rx_traits>& __re,
regex_constants::match_flag_type __flags
= regex_constants::match_default)
{
__detail::_AutomatonPtr __a = __re._M_get_automaton();
__detail::_Automaton::_SizeT __sz = __a->_M_sub_count();
__detail::_SpecializedCursor<_Bi_iter> __cs(__s, __e);
__detail::_SpecializedResults<_Bi_iter, _Alloc> __r(__sz, __cs, __m);
return __a->_M_get_matcher(__cs, __r, __a, __flags)->_M_match();
}
/**
* @brief Indicates if there is a match between the regular expression @p e
* and all of the character sequence [first, last).
*
* @param __first Beginning of the character sequence to match.
* @param __last One-past-the-end of the character sequence to match.
* @param __re The regular expression.
* @param __flags Controls how the regular expression is matched.
*
* @retval true A match exists.
* @retval false Otherwise.
*
* @throws an exception of type regex_error.
*/
template<typename _Bi_iter, typename _Ch_type, typename _Rx_traits>
bool
regex_match(_Bi_iter __first, _Bi_iter __last,
const basic_regex<_Ch_type, _Rx_traits>& __re,
regex_constants::match_flag_type __flags
= regex_constants::match_default)
{
match_results<_Bi_iter> __what;
return regex_match(__first, __last, __what, __re, __flags);
}
/**
* @brief Determines if there is a match between the regular expression @p e
* and a C-style null-terminated string.
*
* @param __s The C-style null-terminated string to match.
* @param __m The match results.
* @param __re The regular expression.
* @param __f Controls how the regular expression is matched.
*
* @retval true A match exists.
* @retval false Otherwise.
*
* @throws an exception of type regex_error.
*/
template<typename _Ch_type, typename _Alloc, typename _Rx_traits>
inline bool
regex_match(const _Ch_type* __s,
match_results<const _Ch_type*, _Alloc>& __m,
const basic_regex<_Ch_type, _Rx_traits>& __re,
regex_constants::match_flag_type __f
= regex_constants::match_default)
{ return regex_match(__s, __s + _Rx_traits::length(__s), __m, __re, __f); }
/**
* @brief Determines if there is a match between the regular expression @p e
* and a string.
*
* @param __s The string to match.
* @param __m The match results.
* @param __re The regular expression.
* @param __flags Controls how the regular expression is matched.
*
* @retval true A match exists.
* @retval false Otherwise.
*
* @throws an exception of type regex_error.
*/
template<typename _Ch_traits, typename _Ch_alloc,
typename _Alloc, typename _Ch_type, typename _Rx_traits>
inline bool
regex_match(const basic_string<_Ch_type, _Ch_traits, _Ch_alloc>& __s,
match_results<typename basic_string<_Ch_type,
_Ch_traits, _Ch_alloc>::const_iterator, _Alloc>& __m,
const basic_regex<_Ch_type, _Rx_traits>& __re,
regex_constants::match_flag_type __flags
= regex_constants::match_default)
{ return regex_match(__s.begin(), __s.end(), __m, __re, __flags); }
/**
* @brief Indicates if there is a match between the regular expression @p e
* and a C-style null-terminated string.
*
* @param __s The C-style null-terminated string to match.
* @param __re The regular expression.
* @param __f Controls how the regular expression is matched.
*
* @retval true A match exists.
* @retval false Otherwise.
*
* @throws an exception of type regex_error.
*/
template<typename _Ch_type, class _Rx_traits>
inline bool
regex_match(const _Ch_type* __s,
const basic_regex<_Ch_type, _Rx_traits>& __re,
regex_constants::match_flag_type __f
= regex_constants::match_default)
{ return regex_match(__s, __s + _Rx_traits::length(__s), __re, __f); }
/**
* @brief Indicates if there is a match between the regular expression @p e
* and a string.
*
* @param __s [IN] The string to match.
* @param __re [IN] The regular expression.
* @param __flags [IN] Controls how the regular expression is matched.
*
* @retval true A match exists.
* @retval false Otherwise.
*
* @throws an exception of type regex_error.
*/
template<typename _Ch_traits, typename _Str_allocator,
typename _Ch_type, typename _Rx_traits>
inline bool
regex_match(const basic_string<_Ch_type, _Ch_traits, _Str_allocator>& __s,
const basic_regex<_Ch_type, _Rx_traits>& __re,
regex_constants::match_flag_type __flags
= regex_constants::match_default)
{ return regex_match(__s.begin(), __s.end(), __re, __flags); }
// [7.11.3] Function template regex_search
/**
* Searches for a regular expression within a range.
* @param __first [IN] The start of the string to search.
* @param __last [IN] One-past-the-end of the string to search.
* @param __m [OUT] The match results.
* @param __re [IN] The regular expression to search for.
* @param __flags [IN] Search policy flags.
* @retval true A match was found within the string.
* @retval false No match was found within the string, the content of %m is
* undefined.
*
* @throws an exception of type regex_error.
*
* @todo Implement this function.
*/
template<typename _Bi_iter, typename _Alloc,
typename _Ch_type, typename _Rx_traits>
inline bool
regex_search(_Bi_iter __first, _Bi_iter __last,
match_results<_Bi_iter, _Alloc>& __m,
const basic_regex<_Ch_type, _Rx_traits>& __re,
regex_constants::match_flag_type __flags
= regex_constants::match_default)
{
__detail::_AutomatonPtr __a = __re._M_get_automaton();
__detail::_Automaton::_SizeT __sz = __a->_M_sub_count();
__detail::_SpecializedCursor<_Bi_iter> __cs(__first, __last);
__detail::_SpecializedResults<_Bi_iter, _Alloc> __r(__sz, __cs, __m);
for (auto __cur = __first; __cur != __last; ++__cur) // Any KMP-like algo?
{
__detail::_SpecializedCursor<_Bi_iter> __curs(__cur, __last);
auto __matcher = __a->_M_get_matcher(__curs, __r, __a, __flags);
if (__matcher->_M_search_from_first())
{
__r._M_set_range(__m.size(),
__detail::_SpecializedCursor<_Bi_iter>
{__first, __m[0].first});
__r._M_set_range(__m.size()+1,
__detail::_SpecializedCursor<_Bi_iter>
{__m[0].second, __last});
__r._M_set_matched(__m.size(),
__m.prefix().first != __m.prefix().second);
__r._M_set_matched(__m.size()+1,
__m.suffix().first != __m.suffix().second);
return true;
}
}
return false;
}
/**
* Searches for a regular expression within a range.
* @param __first [IN] The start of the string to search.
* @param __last [IN] One-past-the-end of the string to search.
* @param __re [IN] The regular expression to search for.
* @param __flags [IN] Search policy flags.
* @retval true A match was found within the string.
* @retval false No match was found within the string.
*
* @throws an exception of type regex_error.
*/
template<typename _Bi_iter, typename _Ch_type, typename _Rx_traits>
inline bool
regex_search(_Bi_iter __first, _Bi_iter __last,
const basic_regex<_Ch_type, _Rx_traits>& __re,
regex_constants::match_flag_type __flags
= regex_constants::match_default)
{
match_results<_Bi_iter> __what;
return regex_search(__first, __last, __what, __re, __flags);
}
/**
* @brief Searches for a regular expression within a C-string.
* @param __s [IN] A C-string to search for the regex.
* @param __m [OUT] The set of regex matches.
* @param __e [IN] The regex to search for in @p s.
* @param __f [IN] The search flags.
* @retval true A match was found within the string.
* @retval false No match was found within the string, the content of %m is
* undefined.
*
* @throws an exception of type regex_error.
*/
template<typename _Ch_type, class _Alloc, class _Rx_traits>
inline bool
regex_search(const _Ch_type* __s,
match_results<const _Ch_type*, _Alloc>& __m,
const basic_regex<_Ch_type, _Rx_traits>& __e,
regex_constants::match_flag_type __f
= regex_constants::match_default)
{ return regex_search(__s, __s + _Rx_traits::length(__s), __m, __e, __f); }
/**
* @brief Searches for a regular expression within a C-string.
* @param __s [IN] The C-string to search.
* @param __e [IN] The regular expression to search for.
* @param __f [IN] Search policy flags.
* @retval true A match was found within the string.
* @retval false No match was found within the string.
*
* @throws an exception of type regex_error.
*/
template<typename _Ch_type, typename _Rx_traits>
inline bool
regex_search(const _Ch_type* __s,
const basic_regex<_Ch_type, _Rx_traits>& __e,
regex_constants::match_flag_type __f
= regex_constants::match_default)
{ return regex_search(__s, __s + _Rx_traits::length(__s), __e, __f); }
/**
* @brief Searches for a regular expression within a string.
* @param __s [IN] The string to search.
* @param __e [IN] The regular expression to search for.
* @param __flags [IN] Search policy flags.
* @retval true A match was found within the string.
* @retval false No match was found within the string.
*
* @throws an exception of type regex_error.
*/
template<typename _Ch_traits, typename _String_allocator,
typename _Ch_type, typename _Rx_traits>
inline bool
regex_search(const basic_string<_Ch_type, _Ch_traits,
_String_allocator>& __s,
const basic_regex<_Ch_type, _Rx_traits>& __e,
regex_constants::match_flag_type __flags
= regex_constants::match_default)
{ return regex_search(__s.begin(), __s.end(), __e, __flags); }
/**
* @brief Searches for a regular expression within a string.
* @param __s [IN] A C++ string to search for the regex.
* @param __m [OUT] The set of regex matches.
* @param __e [IN] The regex to search for in @p s.
* @param __f [IN] The search flags.
* @retval true A match was found within the string.
* @retval false No match was found within the string, the content of %m is
* undefined.
*
* @throws an exception of type regex_error.
*/
template<typename _Ch_traits, typename _Ch_alloc,
typename _Alloc, typename _Ch_type,
typename _Rx_traits>
inline bool
regex_search(const basic_string<_Ch_type, _Ch_traits, _Ch_alloc>& __s,
match_results<typename basic_string<_Ch_type,
_Ch_traits, _Ch_alloc>::const_iterator, _Alloc>& __m,
const basic_regex<_Ch_type, _Rx_traits>& __e,
regex_constants::match_flag_type __f
= regex_constants::match_default)
{ return regex_search(__s.begin(), __s.end(), __m, __e, __f); }
// std [28.11.4] Function template regex_replace
/**
* @doctodo
* @param __out
* @param __first
* @param __last
* @param __e
* @param __fmt
* @param __flags
*
* @returns out
* @throws an exception of type regex_error.
*
* @todo Implement this function.
*/
template<typename _Out_iter, typename _Bi_iter,
typename _Rx_traits, typename _Ch_type>
inline _Out_iter
regex_replace(_Out_iter __out, _Bi_iter __first, _Bi_iter __last,
const basic_regex<_Ch_type, _Rx_traits>& __e,
const basic_string<_Ch_type>& __fmt,
regex_constants::match_flag_type __flags
= regex_constants::match_default)
{ return __out; }
/**
* @doctodo
* @param __s
* @param __e
* @param __fmt
* @param __flags
*
* @returns a copy of string @p s with replacements.
*
* @throws an exception of type regex_error.
*/
template<typename _Rx_traits, typename _Ch_type>
inline basic_string<_Ch_type>
regex_replace(const basic_string<_Ch_type>& __s,
const basic_regex<_Ch_type, _Rx_traits>& __e,
const basic_string<_Ch_type>& __fmt,
regex_constants::match_flag_type __flags
= regex_constants::match_default)
{
basic_string<_Ch_type> __result;
regex_replace(std::back_inserter(__result),
__s.begin(), __s.end(), __e, __fmt, __flags);
return __result;
}
//@}
// std [28.12] Class template regex_iterator
/**
* An iterator adaptor that will provide repeated calls of regex_search over
* a range until no more matches remain.
*/
template<typename _Bi_iter,
typename _Ch_type = typename iterator_traits<_Bi_iter>::value_type,
typename _Rx_traits = regex_traits<_Ch_type> >
class regex_iterator
{
public:
typedef basic_regex<_Ch_type, _Rx_traits> regex_type;
typedef match_results<_Bi_iter> value_type;
typedef std::ptrdiff_t difference_type;
typedef const value_type* pointer;
typedef const value_type& reference;
typedef std::forward_iterator_tag iterator_category;
/**
* @brief Provides a singular iterator, useful for indicating
* one-past-the-end of a range.
*/
regex_iterator()
: _M_match()
{ }
/**
* Constructs a %regex_iterator...
* @param __a [IN] The start of a text range to search.
* @param __b [IN] One-past-the-end of the text range to search.
* @param __re [IN] The regular expression to match.
* @param __m [IN] Policy flags for match rules.
*/
regex_iterator(_Bi_iter __a, _Bi_iter __b, const regex_type& __re,
regex_constants::match_flag_type __m
= regex_constants::match_default)
: _M_begin(__a), _M_end(__b), _M_pregex(&__re), _M_flags(__m), _M_match()
{ regex_search(_M_begin, _M_end, _M_match, *_M_pregex, _M_flags); }
/**
* Copy constructs a %regex_iterator.
*/
regex_iterator(const regex_iterator& __rhs) = default;
/**
* @brief Assigns one %regex_iterator to another.
*/
regex_iterator&
operator=(const regex_iterator& __rhs) = default;
/**
* @brief Tests the equivalence of two regex iterators.
*/
bool
operator==(const regex_iterator& __rhs) const;
/**
* @brief Tests the inequivalence of two regex iterators.
*/
bool
operator!=(const regex_iterator& __rhs) const
{ return !(*this == __rhs); }
/**
* @brief Dereferences a %regex_iterator.
*/
const value_type&
operator*() const
{ return _M_match; }
/**
* @brief Selects a %regex_iterator member.
*/
const value_type*
operator->() const
{ return &_M_match; }
/**
* @brief Increments a %regex_iterator.
*/
regex_iterator&
operator++();
/**
* @brief Postincrements a %regex_iterator.
*/
regex_iterator
operator++(int)
{
auto __tmp = *this;
++(*this);
return __tmp;
}
private:
_Bi_iter _M_begin;
_Bi_iter _M_end;
const regex_type* _M_pregex;
regex_constants::match_flag_type _M_flags;
match_results<_Bi_iter> _M_match;
};
template<typename _Bi_iter,
typename _Ch_type,
typename _Rx_traits>
bool
regex_iterator<_Bi_iter, _Ch_type, _Rx_traits>::
operator==(const regex_iterator& __rhs) const
{
return (_M_match.empty() && __rhs._M_match.empty())
|| (_M_begin == __rhs._M_begin
&& _M_end == __rhs._M_end
&& _M_pregex == __rhs._M_pregex
&& _M_flags == __rhs._M_flags
&& _M_match[0] == __rhs._M_match[0]);
}
template<typename _Bi_iter,
typename _Ch_type,
typename _Rx_traits>
regex_iterator<_Bi_iter, _Ch_type, _Rx_traits>&
regex_iterator<_Bi_iter, _Ch_type, _Rx_traits>::
operator++()
{
// FIXME: In all cases in which the call to regex_search returns true,
// match.prefix().first shall be equal to the previous value of
// match[0].second, and for each index i in the half-open range
// [0, match.size()) for which match[i].matched is true,
// match[i].position() shall return distance(begin, match[i].first).
// [28.12.1.4.5]
if (_M_match[0].matched)
{
auto __start = _M_match[0].second;
if (_M_match[0].first == _M_match[0].second)
if (__start == _M_end)
{
_M_match = value_type();
return *this;
}
else
{
if (regex_search(__start, _M_end, _M_match, *_M_pregex, _M_flags
| regex_constants::match_not_null
| regex_constants::match_continuous))
return *this;
else
++__start;
}
_M_flags |= regex_constants::match_prev_avail;
if (!regex_search(__start, _M_end, _M_match, *_M_pregex, _M_flags))
_M_match = value_type();
}
return *this;
}
typedef regex_iterator<const char*> cregex_iterator;
typedef regex_iterator<string::const_iterator> sregex_iterator;
#ifdef _GLIBCXX_USE_WCHAR_T
typedef regex_iterator<const wchar_t*> wcregex_iterator;
typedef regex_iterator<wstring::const_iterator> wsregex_iterator;
#endif
// [7.12.2] Class template regex_token_iterator
/**
* Iterates over submatches in a range (or @a splits a text string).
*
* The purpose of this iterator is to enumerate all, or all specified,
* matches of a regular expression within a text range. The dereferenced
* value of an iterator of this class is a std::sub_match object.
*/
template<typename _Bi_iter,
typename _Ch_type = typename iterator_traits<_Bi_iter>::value_type,
typename _Rx_traits = regex_traits<_Ch_type> >
class regex_token_iterator
{
public:
typedef basic_regex<_Ch_type, _Rx_traits> regex_type;
typedef sub_match<_Bi_iter> value_type;
typedef std::ptrdiff_t difference_type;
typedef const value_type* pointer;
typedef const value_type& reference;
typedef std::forward_iterator_tag iterator_category;
public:
/**
* @brief Default constructs a %regex_token_iterator.
*
* A default-constructed %regex_token_iterator is a singular iterator
* that will compare equal to the one-past-the-end value for any
* iterator of the same type.
*/
regex_token_iterator()
: _M_position(), _M_result(nullptr), _M_suffix(), _M_n(0), _M_subs()
{ }
/**
* Constructs a %regex_token_iterator...
* @param __a [IN] The start of the text to search.
* @param __b [IN] One-past-the-end of the text to search.
* @param __re [IN] The regular expression to search for.
* @param __submatch [IN] Which submatch to return. There are some
* special values for this parameter:
* - -1 each enumerated subexpression does NOT
* match the regular expression (aka field
* splitting)
* - 0 the entire string matching the
* subexpression is returned for each match
* within the text.
* - >0 enumerates only the indicated
* subexpression from a match within the text.
* @param __m [IN] Policy flags for match rules.
*/
regex_token_iterator(_Bi_iter __a, _Bi_iter __b, const regex_type& __re,
int __submatch = 0,
regex_constants::match_flag_type __m
= regex_constants::match_default)
: _M_position(__a, __b, __re, __m), _M_subs(1, __submatch), _M_n(0)
{ _M_init(__a, __b); }
/**
* Constructs a %regex_token_iterator...
* @param __a [IN] The start of the text to search.
* @param __b [IN] One-past-the-end of the text to search.
* @param __re [IN] The regular expression to search for.
* @param __submatches [IN] A list of subexpressions to return for each
* regular expression match within the text.
* @param __m [IN] Policy flags for match rules.
*/
regex_token_iterator(_Bi_iter __a, _Bi_iter __b,
const regex_type& __re,
const std::vector<int>& __submatches,
regex_constants::match_flag_type __m
= regex_constants::match_default)
: _M_position(__a, __b, __re, __m), _M_subs(__submatches), _M_n(0)
{ _M_init(__a, __b); }
/**
* Constructs a %regex_token_iterator...
* @param __a [IN] The start of the text to search.
* @param __b [IN] One-past-the-end of the text to search.
* @param __re [IN] The regular expression to search for.
* @param __submatches [IN] A list of subexpressions to return for each
* regular expression match within the text.
* @param __m [IN] Policy flags for match rules.
*/
regex_token_iterator(_Bi_iter __a, _Bi_iter __b,
const regex_type& __re,
initializer_list<int> __submatches,
regex_constants::match_flag_type __m
= regex_constants::match_default)
: _M_position(__a, __b, __re, __m), _M_subs(__submatches), _M_n(0)
{ _M_init(__a, __b); }
/**
* Constructs a %regex_token_iterator...
* @param __a [IN] The start of the text to search.
* @param __b [IN] One-past-the-end of the text to search.
* @param __re [IN] The regular expression to search for.
* @param __submatches [IN] A list of subexpressions to return for each
* regular expression match within the text.
* @param __m [IN] Policy flags for match rules.
*/
template<std::size_t _Nm>
regex_token_iterator(_Bi_iter __a, _Bi_iter __b,
const regex_type& __re,
const int (&__submatches)[_Nm],
regex_constants::match_flag_type __m
= regex_constants::match_default)
: _M_position(__a, __b, __re, __m),
_M_subs(__submatches, *(&__submatches+1)), _M_n(0)
{ _M_init(__a, __b); }
/**
* @brief Copy constructs a %regex_token_iterator.
* @param __rhs [IN] A %regex_token_iterator to copy.
*/
regex_token_iterator(const regex_token_iterator& __rhs)
: _M_position(__rhs.position), _M_subs(__rhs.subs), _M_n(__rhs.N),
_M_result(__rhs.result), _M_suffix(__rhs.suffix),
_M_has_m1(__rhs._M_has_m1)
{
if (__rhs._M_result == &__rhs._M_suffix)
_M_result = &_M_suffix;
}
/**
* @brief Assigns a %regex_token_iterator to another.
* @param __rhs [IN] A %regex_token_iterator to copy.
*/
regex_token_iterator&
operator=(const regex_token_iterator& __rhs);
/**
* @brief Compares a %regex_token_iterator to another for equality.
*/
bool
operator==(const regex_token_iterator& __rhs) const;
/**
* @brief Compares a %regex_token_iterator to another for inequality.
*/
bool
operator!=(const regex_token_iterator& __rhs) const
{ return !(*this == __rhs); }
/**
* @brief Dereferences a %regex_token_iterator.
*/
const value_type&
operator*() const
{ return *_M_result; }
/**
* @brief Selects a %regex_token_iterator member.
*/
const value_type*
operator->() const
{ return _M_result; }
/**
* @brief Increments a %regex_token_iterator.
*/
regex_token_iterator&
operator++();
/**
* @brief Postincrements a %regex_token_iterator.
*/
regex_token_iterator
operator++(int)
{
auto __tmp = *this;
++(*this);
return __tmp;
}
private:
typedef regex_iterator<_Bi_iter, _Ch_type, _Rx_traits> _Position;
void
_M_init(_Bi_iter __a, _Bi_iter __b);
const value_type&
_M_current_match() const
{
if (_M_subs[_M_n] == -1)
return (*_M_position).prefix();
else
return (*_M_position)[_M_subs[_M_n]];
}
bool
_M_end_of_seq() const
{ return _M_result != nullptr; }
_Position _M_position;
const value_type* _M_result;
value_type _M_suffix;
std::size_t _M_n;
std::vector<int> _M_subs;
// Show whether _M_subs contains -1
bool _M_has_m1;
};
template<typename _Bi_iter,
typename _Ch_type,
typename _Rx_traits>
regex_token_iterator<_Bi_iter, _Ch_type, _Rx_traits>&
regex_token_iterator<_Bi_iter, _Ch_type, _Rx_traits>::
operator=(const regex_token_iterator& __rhs)
{
_M_position = __rhs._M_position;
_M_subs = __rhs._M_subs;
_M_n = __rhs._M_n;
_M_result = __rhs._M_result;
_M_suffix = __rhs._M_suffix;
_M_has_m1 = __rhs._M_has_m1;
if (__rhs._M_result == &__rhs._M_suffix)
_M_result = &_M_suffix;
}
template<typename _Bi_iter,
typename _Ch_type,
typename _Rx_traits>
bool
regex_token_iterator<_Bi_iter, _Ch_type, _Rx_traits>::
operator==(const regex_token_iterator& __rhs) const
{
if (_M_end_of_seq() && __rhs._M_end_of_seq())
return true;
if (_M_suffix.matched && __rhs._M_suffix.matched
&& _M_suffix == __rhs._M_suffix)
return true;
if (_M_end_of_seq() || _M_suffix.matched
|| __rhs._M_end_of_seq() || __rhs._M_suffix.matched)
return false;
return _M_position == __rhs._M_position
&& _M_n == __rhs._M_n
&& _M_subs == __rhs._M_subs;
}
template<typename _Bi_iter,
typename _Ch_type,
typename _Rx_traits>
regex_token_iterator<_Bi_iter, _Ch_type, _Rx_traits>&
regex_token_iterator<_Bi_iter, _Ch_type, _Rx_traits>::
operator++()
{
_Position __prev = _M_position;
if (_M_suffix.matched)
*this = regex_token_iterator();
else if (_M_n + 1 < _M_subs.size())
{
_M_n++;
_M_result = &_M_current_match();
}
else
{
_M_n = 0;
++_M_position;
if (_M_position != _Position())
_M_result = &_M_current_match();
else if (_M_has_m1 && __prev->suffix().length() != 0)
{
_M_suffix.matched = true;
_M_suffix.first = __prev->suffix().first;
_M_suffix.second = __prev->suffix().second;
_M_result = &_M_suffix;
}
else
*this = regex_token_iterator();
}
return *this;
}
template<typename _Bi_iter,
typename _Ch_type,
typename _Rx_traits>
void
regex_token_iterator<_Bi_iter, _Ch_type, _Rx_traits>::
_M_init(_Bi_iter __a, _Bi_iter __b)
{
_M_has_m1 = false;
for (auto __it : _M_subs)
if (__it == -1)
{
_M_has_m1 = true;
break;
}
if (_M_position != _Position())
_M_result = &_M_current_match();
else if (_M_has_m1)
{
_M_suffix.matched = true;
_M_suffix.first = __a;
_M_suffix.second = __b;
_M_result = &_M_suffix;
}
else
_M_result = nullptr;
}
/** @brief Token iterator for C-style NULL-terminated strings. */
typedef regex_token_iterator<const char*> cregex_token_iterator;
/** @brief Token iterator for standard strings. */
typedef regex_token_iterator<string::const_iterator> sregex_token_iterator;
#ifdef _GLIBCXX_USE_WCHAR_T
/** @brief Token iterator for C-style NULL-terminated wide strings. */
typedef regex_token_iterator<const wchar_t*> wcregex_token_iterator;
/** @brief Token iterator for standard wide-character strings. */
typedef regex_token_iterator<wstring::const_iterator> wsregex_token_iterator;
#endif
//@} // group regex
_GLIBCXX_END_NAMESPACE_VERSION
} // namespace