Current File : //backups/router/usr/local/include/boost/locale/boundary/facets.hpp
//
// Copyright (c) 2009-2011 Artyom Beilis (Tonkikh)
//
// Distributed under the Boost Software License, Version 1.0.
// https://www.boost.org/LICENSE_1_0.txt
#ifndef BOOST_LOCALE_BOUNDARY_FACETS_HPP_INCLUDED
#define BOOST_LOCALE_BOUNDARY_FACETS_HPP_INCLUDED
#include <boost/locale/boundary/types.hpp>
#include <boost/locale/detail/facet_id.hpp>
#include <boost/locale/detail/is_supported_char.hpp>
#include <locale>
#include <vector>
#ifdef BOOST_MSVC
# pragma warning(push)
# pragma warning(disable : 4275 4251 4231 4660)
#endif
namespace boost { namespace locale {
/// \brief This namespace contains all operations required for boundary analysis of text
namespace boundary {
/// \addtogroup boundary
///
/// @{
/// \brief This structure is used for representing boundary points
/// that follow the offset.
struct break_info {
/// Create empty break point at beginning
break_info() : offset(0), rule(0) {}
/// Create an empty break point at offset v.
/// it is useful for order comparison with other points.
break_info(size_t v) : offset(v), rule(0) {}
/// Offset from the beginning of the text where a break occurs.
size_t offset;
/// The identification of this break point according to
/// various break types
rule_type rule;
/// Compare two break points' offset. Allows to search with
/// standard algorithms over the index.
bool operator<(const break_info& other) const { return offset < other.offset; }
};
/// This type holds the analysis of the text - all its break points
/// with marks
typedef std::vector<break_info> index_type;
/// \brief This facet generates an index for boundary analysis of a given text.
///
/// It is implemented for supported character types, at least \c char, \c wchar_t
template<typename Char>
class BOOST_SYMBOL_VISIBLE boundary_indexing : public std::locale::facet,
public boost::locale::detail::facet_id<boundary_indexing<Char>> {
BOOST_LOCALE_ASSERT_IS_SUPPORTED(Char);
public:
/// Default constructor typical for facets
boundary_indexing(size_t refs = 0) : std::locale::facet(refs) {}
/// Create index for boundary type \a t for text in range [begin,end)
///
/// The returned value is an index of type \ref index_type. Note that this
/// index is never empty, even if the range [begin,end) is empty it consists
/// of at least one boundary point with the offset 0.
virtual index_type map(boundary_type t, const Char* begin, const Char* end) const = 0;
};
/// @}
} // namespace boundary
}} // namespace boost::locale
#ifdef BOOST_MSVC
# pragma warning(pop)
#endif
#endif
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