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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_grep.hpp
* VERSION see <boost/version.hpp>
* DESCRIPTION: Provides regex_grep implementation.
*/
#ifndef BOOST_REGEX_V4_REGEX_GREP_HPP
#define BOOST_REGEX_V4_REGEX_GREP_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
//
// regex_grep:
// find all non-overlapping matches within the sequence first last:
//
template <class Predicate, class BidiIterator, class charT, class traits>
inline unsigned int regex_grep(Predicate foo,
BidiIterator first,
BidiIterator last,
const basic_regex<charT, traits>& e,
match_flag_type flags = match_default)
{
if(e.flags() & regex_constants::failbit)
return false;
typedef typename match_results<BidiIterator>::allocator_type match_allocator_type;
match_results<BidiIterator> m;
re_detail::perl_matcher<BidiIterator, match_allocator_type, traits> matcher(first, last, m, e, flags, first);
unsigned int count = 0;
while(matcher.find())
{
++count;
if(0 == foo(m))
return count; // caller doesn't want to go on
if(m[0].second == last)
return count; // we've reached the end, don't try and find an extra null match.
if(m.length() == 0)
{
if(m[0].second == last)
return count;
// we found a NULL-match, now try to find
// a non-NULL one at the same position:
match_results<BidiIterator, match_allocator_type> m2(m);
matcher.setf(match_not_null | match_continuous);
if(matcher.find())
{
++count;
if(0 == foo(m))
return count;
}
else
{
// reset match back to where it was:
m = m2;
}
matcher.unsetf((match_not_null | match_continuous) & ~flags);
}
}
return count;
}
//
// regex_grep convenience interfaces:
#ifndef BOOST_NO_FUNCTION_TEMPLATE_ORDERING
//
// this isn't really a partial specialisation, but template function
// overloading - if the compiler doesn't support partial specialisation
// then it really won't support this either:
template <class Predicate, class charT, class traits>
inline unsigned int regex_grep(Predicate foo, const charT* str,
const basic_regex<charT, traits>& e,
match_flag_type flags = match_default)
{
return regex_grep(foo, str, str + traits::length(str), e, flags);
}
template <class Predicate, class ST, class SA, class charT, class traits>
inline unsigned int regex_grep(Predicate foo, const std::basic_string<charT, ST, SA>& s,
const basic_regex<charT, traits>& e,
match_flag_type flags = match_default)
{
return regex_grep(foo, s.begin(), s.end(), e, flags);
}
#else // partial specialisation
inline unsigned int regex_grep(bool (*foo)(const cmatch&), const char* str,
const regex& e,
match_flag_type flags = match_default)
{
return regex_grep(foo, str, str + regex::traits_type::length(str), e, flags);
}
#ifndef BOOST_NO_WREGEX
inline unsigned int regex_grep(bool (*foo)(const wcmatch&), const wchar_t* str,
const wregex& e,
match_flag_type flags = match_default)
{
return regex_grep(foo, str, str + wregex::traits_type::length(str), e, flags);
}
#endif
inline unsigned int regex_grep(bool (*foo)(const match_results<std::string::const_iterator>&), const std::string& s,
const regex& e,
match_flag_type flags = match_default)
{
return regex_grep(foo, s.begin(), s.end(), e, flags);
}
#if !defined(BOOST_NO_WREGEX)
inline unsigned int regex_grep(bool (*foo)(const match_results<std::basic_string<wchar_t>::const_iterator>&),
const std::basic_string<wchar_t>& s,
const wregex& e,
match_flag_type flags = match_default)
{
return regex_grep(foo, s.begin(), s.end(), e, flags);
}
#endif
#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 // BOOST_REGEX_V4_REGEX_GREP_HPP
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