74 lines
2.7 KiB
Plaintext
74 lines
2.7 KiB
Plaintext
|
//---------------------------------------------------------------------------//
|
||
|
|
// Copyright (c) 2014 Roshan <thisisroshansmail@gmail.com>
|
||
|
|
//
|
||
|
|
// Distributed under 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
|
||
|
|
//
|
||
|
|
// See http://boostorg.github.com/compute for more information.
|
||
|
|
//---------------------------------------------------------------------------//
|
||
|
|
|
||
|
|
#ifndef BOOST_COMPUTE_ALGORITHM_SEARCH_HPP
|
||
|
|
#define BOOST_COMPUTE_ALGORITHM_SEARCH_HPP
|
||
|
|
|
||
|
|
#include <boost/compute/algorithm/detail/search_all.hpp>
|
||
|
|
#include <boost/compute/algorithm/find.hpp>
|
||
|
|
#include <boost/compute/container/vector.hpp>
|
||
|
|
#include <boost/compute/detail/iterator_range_size.hpp>
|
||
|
|
#include <boost/compute/detail/meta_kernel.hpp>
|
||
|
|
#include <boost/compute/system.hpp>
|
||
|
|
|
||
|
|
namespace boost {
|
||
|
|
namespace compute {
|
||
|
|
|
||
|
|
///
|
||
|
|
/// \brief Substring matching algorithm
|
||
|
|
///
|
||
|
|
/// Searches for the first match of the pattern [p_first, p_last)
|
||
|
|
/// in text [t_first, t_last).
|
||
|
|
/// \return Iterator pointing to beginning of first occurrence
|
||
|
|
///
|
||
|
|
/// \param t_first Iterator pointing to start of text
|
||
|
|
/// \param t_last Iterator pointing to end of text
|
||
|
|
/// \param p_first Iterator pointing to start of pattern
|
||
|
|
/// \param p_last Iterator pointing to end of pattern
|
||
|
|
/// \param queue Queue on which to execute
|
||
|
|
///
|
||
|
|
template<class TextIterator, class PatternIterator>
|
||
|
|
inline TextIterator search(TextIterator t_first,
|
||
|
|
TextIterator t_last,
|
||
|
|
PatternIterator p_first,
|
||
|
|
PatternIterator p_last,
|
||
|
|
command_queue &queue = system::default_queue())
|
||
|
|
{
|
||
|
|
// there is no need to check if pattern starts at last n - 1 indices
|
||
|
|
vector<uint_> matching_indices(
|
||
|
|
detail::iterator_range_size(t_first, t_last)
|
||
|
|
- detail::iterator_range_size(p_first, p_last) + 1,
|
||
|
|
queue.get_context()
|
||
|
|
);
|
||
|
|
|
||
|
|
// search_kernel puts value 1 at every index in vector where pattern starts at
|
||
|
|
detail::search_kernel<PatternIterator,
|
||
|
|
TextIterator,
|
||
|
|
vector<uint_>::iterator> kernel;
|
||
|
|
|
||
|
|
kernel.set_range(p_first, p_last, t_first, t_last, matching_indices.begin());
|
||
|
|
kernel.exec(queue);
|
||
|
|
|
||
|
|
vector<uint_>::iterator index = ::boost::compute::find(
|
||
|
|
matching_indices.begin(), matching_indices.end(), uint_(1), queue
|
||
|
|
);
|
||
|
|
|
||
|
|
// pattern was not found
|
||
|
|
if(index == matching_indices.end())
|
||
|
|
return t_last;
|
||
|
|
|
||
|
|
return t_first + detail::iterator_range_size(matching_indices.begin(), index);
|
||
|
|
}
|
||
|
|
|
||
|
|
} //end compute namespace
|
||
|
|
} //end boost namespace
|
||
|
|
|
||
|
|
#endif // BOOST_COMPUTE_ALGORITHM_SEARCH_HPP
|