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// charset.hpp
// Copyright (c) 2007-2009 Ben Hanson (http://www.benhanson.net/)
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file licence_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
#ifndef BOOST_LEXER_CHARSET_HPP
#define BOOST_LEXER_CHARSET_HPP
#include <set>
#include "../size_t.hpp"
#include "../string_token.hpp"
namespace boost
{
namespace lexer
{
namespace detail
{
template<typename CharT>
struct basic_charset
{
typedef basic_string_token<CharT> token;
typedef std::set<std::size_t> index_set;
token _token;
index_set _index_set;
basic_charset ()
{
}
basic_charset (const token &token_, const std::size_t index_) :
_token (token_)
{
_index_set.insert (index_);
}
bool empty () const
{
return _token.empty () && _index_set.empty ();
}
void intersect (basic_charset &rhs_, basic_charset &overlap_)
{
_token.intersect (rhs_._token, overlap_._token);
if (!overlap_._token.empty ())
{
typename index_set::const_iterator iter_ = _index_set.begin ();
typename index_set::const_iterator end_ = _index_set.end ();
for (; iter_ != end_; ++iter_)
{
overlap_._index_set.insert (*iter_);
}
iter_ = rhs_._index_set.begin ();
end_ = rhs_._index_set.end ();
for (; iter_ != end_; ++iter_)
{
overlap_._index_set.insert (*iter_);
}
if (_token.empty ())
{
_index_set.clear ();
}
if (rhs_._token.empty ())
{
rhs_._index_set.clear ();
}
}
}
};
}
}
}
#endif
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