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/*
*
* 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_MSVC
#pragma warning(push)
#pragma warning(disable: 4103)
#endif
#ifdef BOOST_HAS_ABI_HEADERS
# include BOOST_ABI_PREFIX
#endif
#ifdef BOOST_MSVC
#pragma warning(pop)
#endif
#ifdef BOOST_MSVC
# pragma warning(push)
# pragma warning(disable: 4800)
#endif
namespace re_detail{
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 re_detail
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;
re_detail::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() == 1))
{
*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, re_detail::get_default_expression(charT(0)), match_default, UINT_MAX);
}
#ifdef BOOST_MSVC
# pragma warning(pop)
#endif
#ifdef BOOST_MSVC
#pragma warning(push)
#pragma warning(disable: 4103)
#endif
#ifdef BOOST_HAS_ABI_HEADERS
# include BOOST_ABI_SUFFIX
#endif
#ifdef BOOST_MSVC
#pragma warning(pop)
#endif
} // namespace boost
#endif
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