You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
153 lines
4.5 KiB
153 lines
4.5 KiB
/*
|
|
*
|
|
* Copyright (c) 1998-2002
|
|
* John Maddock
|
|
*
|
|
* Use, modification and distribution are subject to the
|
|
* Boost Software License, Version 1.0. (See accompanying file
|
|
* LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
|
|
*
|
|
*/
|
|
|
|
/*
|
|
* LOCATION: see http://www.boost.org for most recent version.
|
|
* FILE regex_split.hpp
|
|
* VERSION see <boost/version.hpp>
|
|
* DESCRIPTION: Implements regex_split and associated functions.
|
|
* Note this is an internal header file included
|
|
* by regex.hpp, do not include on its own.
|
|
*/
|
|
|
|
#ifndef BOOST_REGEX_SPLIT_HPP
|
|
#define BOOST_REGEX_SPLIT_HPP
|
|
|
|
namespace boost{
|
|
|
|
#ifdef BOOST_REGEX_MSVC
|
|
# pragma warning(push)
|
|
#if BOOST_REGEX_MSVC < 1910
|
|
#pragma warning(disable:4800)
|
|
#endif
|
|
#endif
|
|
|
|
namespace BOOST_REGEX_DETAIL_NS{
|
|
|
|
template <class charT>
|
|
const basic_regex<charT>& get_default_expression(charT)
|
|
{
|
|
static const charT expression_text[4] = { '\\', 's', '+', '\00', };
|
|
static const basic_regex<charT> e(expression_text);
|
|
return e;
|
|
}
|
|
|
|
template <class OutputIterator, class charT, class Traits1, class Alloc1>
|
|
class split_pred
|
|
{
|
|
typedef std::basic_string<charT, Traits1, Alloc1> string_type;
|
|
typedef typename string_type::const_iterator iterator_type;
|
|
iterator_type* p_last;
|
|
OutputIterator* p_out;
|
|
std::size_t* p_max;
|
|
std::size_t initial_max;
|
|
public:
|
|
split_pred(iterator_type* a, OutputIterator* b, std::size_t* c)
|
|
: p_last(a), p_out(b), p_max(c), initial_max(*c) {}
|
|
|
|
bool operator()(const match_results<iterator_type>& what);
|
|
};
|
|
|
|
template <class OutputIterator, class charT, class Traits1, class Alloc1>
|
|
bool split_pred<OutputIterator, charT, Traits1, Alloc1>::operator()
|
|
(const match_results<iterator_type>& what)
|
|
{
|
|
*p_last = what[0].second;
|
|
if(what.size() > 1)
|
|
{
|
|
// output sub-expressions only:
|
|
for(unsigned i = 1; i < what.size(); ++i)
|
|
{
|
|
*(*p_out) = what.str(i);
|
|
++(*p_out);
|
|
if(0 == --*p_max) return false;
|
|
}
|
|
return *p_max != 0;
|
|
}
|
|
else
|
|
{
|
|
// output $` only if it's not-null or not at the start of the input:
|
|
const sub_match<iterator_type>& sub = what[-1];
|
|
if((sub.first != sub.second) || (*p_max != initial_max))
|
|
{
|
|
*(*p_out) = sub.str();
|
|
++(*p_out);
|
|
return --*p_max;
|
|
}
|
|
}
|
|
//
|
|
// initial null, do nothing:
|
|
return true;
|
|
}
|
|
|
|
} // namespace BOOST_REGEX_DETAIL_NS
|
|
|
|
template <class OutputIterator, class charT, class Traits1, class Alloc1, class Traits2>
|
|
std::size_t regex_split(OutputIterator out,
|
|
std::basic_string<charT, Traits1, Alloc1>& s,
|
|
const basic_regex<charT, Traits2>& e,
|
|
match_flag_type flags,
|
|
std::size_t max_split)
|
|
{
|
|
typedef typename std::basic_string<charT, Traits1, Alloc1>::const_iterator ci_t;
|
|
//typedef typename match_results<ci_t>::allocator_type match_allocator;
|
|
ci_t last = s.begin();
|
|
std::size_t init_size = max_split;
|
|
BOOST_REGEX_DETAIL_NS::split_pred<OutputIterator, charT, Traits1, Alloc1> pred(&last, &out, &max_split);
|
|
ci_t i, j;
|
|
i = s.begin();
|
|
j = s.end();
|
|
regex_grep(pred, i, j, e, flags);
|
|
//
|
|
// if there is still input left, do a final push as long as max_split
|
|
// is not exhausted, and we're not splitting sub-expressions rather
|
|
// than whitespace:
|
|
if(max_split && (last != s.end()) && (e.mark_count() == 0))
|
|
{
|
|
*out = std::basic_string<charT, Traits1, Alloc1>((ci_t)last, (ci_t)s.end());
|
|
++out;
|
|
last = s.end();
|
|
--max_split;
|
|
}
|
|
//
|
|
// delete from the string everything that has been processed so far:
|
|
s.erase(0, last - s.begin());
|
|
//
|
|
// return the number of new records pushed:
|
|
return init_size - max_split;
|
|
}
|
|
|
|
template <class OutputIterator, class charT, class Traits1, class Alloc1, class Traits2>
|
|
inline std::size_t regex_split(OutputIterator out,
|
|
std::basic_string<charT, Traits1, Alloc1>& s,
|
|
const basic_regex<charT, Traits2>& e,
|
|
match_flag_type flags = match_default)
|
|
{
|
|
return regex_split(out, s, e, flags, UINT_MAX);
|
|
}
|
|
|
|
template <class OutputIterator, class charT, class Traits1, class Alloc1>
|
|
inline std::size_t regex_split(OutputIterator out,
|
|
std::basic_string<charT, Traits1, Alloc1>& s)
|
|
{
|
|
return regex_split(out, s, BOOST_REGEX_DETAIL_NS::get_default_expression(charT(0)), match_default, UINT_MAX);
|
|
}
|
|
|
|
#ifdef BOOST_REGEX_MSVC
|
|
# pragma warning(pop)
|
|
#endif
|
|
|
|
} // namespace boost
|
|
|
|
#endif
|
|
|
|
|