1093 lines
47 KiB
C++
1093 lines
47 KiB
C++
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//
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// Copyright (c) 2009-2011 Artyom Beilis (Tonkikh)
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//
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// Distributed under the Boost Software License, Version 1.0. (See
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// accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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//
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#ifndef BOOST_LOCALE_BOUNDARY_INDEX_HPP_INCLUDED
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#define BOOST_LOCALE_BOUNDARY_INDEX_HPP_INCLUDED
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#include <boost/locale/config.hpp>
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#include <boost/locale/boundary/types.hpp>
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#include <boost/locale/boundary/facets.hpp>
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#include <boost/locale/boundary/segment.hpp>
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#include <boost/locale/boundary/boundary_point.hpp>
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#include <boost/iterator/iterator_facade.hpp>
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#include <boost/type_traits/is_same.hpp>
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#include <boost/shared_ptr.hpp>
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#include <boost/cstdint.hpp>
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#include <boost/assert.hpp>
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#ifdef BOOST_MSVC
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# pragma warning(push)
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# pragma warning(disable : 4275 4251 4231 4660)
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#endif
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#include <string>
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#include <locale>
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#include <vector>
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#include <iterator>
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#include <algorithm>
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#include <stdexcept>
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#include <iostream>
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namespace boost {
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namespace locale {
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namespace boundary {
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///
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/// \defgroup boundary Boundary Analysis
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///
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/// This module contains all operations required for %boundary analysis of text: character, word, like and sentence boundaries
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///
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/// @{
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///
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/// \cond INTERNAL
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namespace details {
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template<typename IteratorType,typename CategoryType = typename std::iterator_traits<IteratorType>::iterator_category>
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struct mapping_traits {
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typedef typename std::iterator_traits<IteratorType>::value_type char_type;
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static index_type map(boundary_type t,IteratorType b,IteratorType e,std::locale const &l)
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{
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std::basic_string<char_type> str(b,e);
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return std::use_facet<boundary_indexing<char_type> >(l).map(t,str.c_str(),str.c_str()+str.size());
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}
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};
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template<typename CharType,typename SomeIteratorType>
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struct linear_iterator_traits {
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static const bool is_linear =
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is_same<SomeIteratorType,CharType*>::value
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|| is_same<SomeIteratorType,CharType const*>::value
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|| is_same<SomeIteratorType,typename std::basic_string<CharType>::iterator>::value
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|| is_same<SomeIteratorType,typename std::basic_string<CharType>::const_iterator>::value
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|| is_same<SomeIteratorType,typename std::vector<CharType>::iterator>::value
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|| is_same<SomeIteratorType,typename std::vector<CharType>::const_iterator>::value
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;
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};
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template<typename IteratorType>
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struct mapping_traits<IteratorType,std::random_access_iterator_tag> {
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typedef typename std::iterator_traits<IteratorType>::value_type char_type;
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static index_type map(boundary_type t,IteratorType b,IteratorType e,std::locale const &l)
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{
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index_type result;
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//
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// Optimize for most common cases
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//
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// C++0x requires that string is continious in memory and all known
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// string implementations
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// do this because of c_str() support.
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//
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if(linear_iterator_traits<char_type,IteratorType>::is_linear && b!=e)
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{
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char_type const *begin = &*b;
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char_type const *end = begin + (e-b);
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index_type tmp=std::use_facet<boundary_indexing<char_type> >(l).map(t,begin,end);
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result.swap(tmp);
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}
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else {
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std::basic_string<char_type> str(b,e);
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index_type tmp = std::use_facet<boundary_indexing<char_type> >(l).map(t,str.c_str(),str.c_str()+str.size());
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result.swap(tmp);
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}
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return result;
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}
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};
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template<typename BaseIterator>
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class mapping {
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public:
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typedef BaseIterator base_iterator;
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typedef typename std::iterator_traits<base_iterator>::value_type char_type;
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mapping(boundary_type type,
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base_iterator begin,
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base_iterator end,
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std::locale const &loc)
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:
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index_(new index_type()),
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begin_(begin),
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end_(end)
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{
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index_type idx=details::mapping_traits<base_iterator>::map(type,begin,end,loc);
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index_->swap(idx);
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}
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mapping()
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{
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}
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index_type const &index() const
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{
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return *index_;
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}
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base_iterator begin() const
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{
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return begin_;
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}
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base_iterator end() const
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{
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return end_;
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}
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private:
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boost::shared_ptr<index_type> index_;
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base_iterator begin_,end_;
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};
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template<typename BaseIterator>
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class segment_index_iterator :
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public boost::iterator_facade<
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segment_index_iterator<BaseIterator>,
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segment<BaseIterator>,
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boost::bidirectional_traversal_tag,
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segment<BaseIterator> const &
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>
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{
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public:
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typedef BaseIterator base_iterator;
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typedef mapping<base_iterator> mapping_type;
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typedef segment<base_iterator> segment_type;
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segment_index_iterator() : current_(0,0),map_(0)
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{
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}
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segment_index_iterator(base_iterator p,mapping_type const *map,rule_type mask,bool full_select) :
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map_(map),
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mask_(mask),
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full_select_(full_select)
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{
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set(p);
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}
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segment_index_iterator(bool is_begin,mapping_type const *map,rule_type mask,bool full_select) :
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map_(map),
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mask_(mask),
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full_select_(full_select)
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{
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if(is_begin)
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set_begin();
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else
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set_end();
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}
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segment_type const &dereference() const
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{
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return value_;
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}
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bool equal(segment_index_iterator const &other) const
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{
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return map_ == other.map_ && current_.second == other.current_.second;
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}
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void increment()
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{
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std::pair<size_t,size_t> next = current_;
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if(full_select_) {
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next.first = next.second;
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while(next.second < size()) {
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next.second++;
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if(valid_offset(next.second))
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break;
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}
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if(next.second == size())
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next.first = next.second - 1;
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}
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else {
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while(next.second < size()) {
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next.first = next.second;
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next.second++;
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if(valid_offset(next.second))
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break;
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}
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}
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update_current(next);
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}
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void decrement()
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{
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std::pair<size_t,size_t> next = current_;
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if(full_select_) {
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while(next.second >1) {
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next.second--;
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if(valid_offset(next.second))
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break;
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}
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next.first = next.second;
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while(next.first >0) {
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next.first--;
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if(valid_offset(next.first))
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break;
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}
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}
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else {
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while(next.second >1) {
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next.second--;
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if(valid_offset(next.second))
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break;
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}
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next.first = next.second - 1;
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}
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update_current(next);
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}
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private:
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void set_end()
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{
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current_.first = size() - 1;
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current_.second = size();
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value_ = segment_type(map_->end(),map_->end(),0);
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}
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void set_begin()
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{
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current_.first = current_.second = 0;
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value_ = segment_type(map_->begin(),map_->begin(),0);
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increment();
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}
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void set(base_iterator p)
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{
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size_t dist=std::distance(map_->begin(),p);
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index_type::const_iterator b=map_->index().begin(),e=map_->index().end();
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index_type::const_iterator
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boundary_point=std::upper_bound(b,e,break_info(dist));
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while(boundary_point != e && (boundary_point->rule & mask_)==0)
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boundary_point++;
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current_.first = current_.second = boundary_point - b;
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if(full_select_) {
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while(current_.first > 0) {
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current_.first --;
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if(valid_offset(current_.first))
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break;
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}
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}
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else {
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if(current_.first > 0)
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current_.first --;
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}
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value_.first = map_->begin();
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std::advance(value_.first,get_offset(current_.first));
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value_.second = value_.first;
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std::advance(value_.second,get_offset(current_.second) - get_offset(current_.first));
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update_rule();
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}
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void update_current(std::pair<size_t,size_t> pos)
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{
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std::ptrdiff_t first_diff = get_offset(pos.first) - get_offset(current_.first);
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std::ptrdiff_t second_diff = get_offset(pos.second) - get_offset(current_.second);
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std::advance(value_.first,first_diff);
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std::advance(value_.second,second_diff);
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current_ = pos;
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update_rule();
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}
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void update_rule()
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{
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if(current_.second != size()) {
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value_.rule(index()[current_.second].rule);
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}
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}
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size_t get_offset(size_t ind) const
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{
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if(ind == size())
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return index().back().offset;
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return index()[ind].offset;
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}
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bool valid_offset(size_t offset) const
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{
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return offset == 0
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|| offset == size() // make sure we not acess index[size]
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|| (index()[offset].rule & mask_)!=0;
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}
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size_t size() const
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{
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return index().size();
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}
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index_type const &index() const
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{
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return map_->index();
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}
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segment_type value_;
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std::pair<size_t,size_t> current_;
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mapping_type const *map_;
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rule_type mask_;
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bool full_select_;
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};
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template<typename BaseIterator>
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class boundary_point_index_iterator :
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public boost::iterator_facade<
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boundary_point_index_iterator<BaseIterator>,
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boundary_point<BaseIterator>,
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boost::bidirectional_traversal_tag,
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boundary_point<BaseIterator> const &
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>
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{
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|
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public:
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|
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typedef BaseIterator base_iterator;
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typedef mapping<base_iterator> mapping_type;
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typedef boundary_point<base_iterator> boundary_point_type;
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boundary_point_index_iterator() : current_(0),map_(0)
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{
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}
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boundary_point_index_iterator(bool is_begin,mapping_type const *map,rule_type mask) :
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map_(map),
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mask_(mask)
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{
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if(is_begin)
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set_begin();
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else
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set_end();
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}
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boundary_point_index_iterator(base_iterator p,mapping_type const *map,rule_type mask) :
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map_(map),
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mask_(mask)
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{
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set(p);
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}
|
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boundary_point_type const &dereference() const
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{
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return value_;
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}
|
||
|
|
|
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|
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bool equal(boundary_point_index_iterator const &other) const
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{
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return map_ == other.map_ && current_ == other.current_;
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}
|
||
|
|
|
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|
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void increment()
|
||
|
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{
|
||
|
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size_t next = current_;
|
||
|
|
while(next < size()) {
|
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|
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next++;
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if(valid_offset(next))
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break;
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}
|
||
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update_current(next);
|
||
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}
|
||
|
|
|
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|
|
void decrement()
|
||
|
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{
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||
|
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size_t next = current_;
|
||
|
|
while(next>0) {
|
||
|
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next--;
|
||
|
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if(valid_offset(next))
|
||
|
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break;
|
||
|
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}
|
||
|
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update_current(next);
|
||
|
|
}
|
||
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|
|
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private:
|
||
|
|
void set_end()
|
||
|
|
{
|
||
|
|
current_ = size();
|
||
|
|
value_ = boundary_point_type(map_->end(),0);
|
||
|
|
}
|
||
|
|
void set_begin()
|
||
|
|
{
|
||
|
|
current_ = 0;
|
||
|
|
value_ = boundary_point_type(map_->begin(),0);
|
||
|
|
}
|
||
|
|
|
||
|
|
void set(base_iterator p)
|
||
|
|
{
|
||
|
|
size_t dist = std::distance(map_->begin(),p);
|
||
|
|
|
||
|
|
index_type::const_iterator b=index().begin();
|
||
|
|
index_type::const_iterator e=index().end();
|
||
|
|
index_type::const_iterator ptr = std::lower_bound(b,e,break_info(dist));
|
||
|
|
|
||
|
|
if(ptr==index().end())
|
||
|
|
current_=size()-1;
|
||
|
|
else
|
||
|
|
current_=ptr - index().begin();
|
||
|
|
|
||
|
|
while(!valid_offset(current_))
|
||
|
|
current_ ++;
|
||
|
|
|
||
|
|
std::ptrdiff_t diff = get_offset(current_) - dist;
|
||
|
|
std::advance(p,diff);
|
||
|
|
value_.iterator(p);
|
||
|
|
update_rule();
|
||
|
|
}
|
||
|
|
|
||
|
|
void update_current(size_t pos)
|
||
|
|
{
|
||
|
|
std::ptrdiff_t diff = get_offset(pos) - get_offset(current_);
|
||
|
|
base_iterator i=value_.iterator();
|
||
|
|
std::advance(i,diff);
|
||
|
|
current_ = pos;
|
||
|
|
value_.iterator(i);
|
||
|
|
update_rule();
|
||
|
|
}
|
||
|
|
|
||
|
|
void update_rule()
|
||
|
|
{
|
||
|
|
if(current_ != size()) {
|
||
|
|
value_.rule(index()[current_].rule);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
size_t get_offset(size_t ind) const
|
||
|
|
{
|
||
|
|
if(ind == size())
|
||
|
|
return index().back().offset;
|
||
|
|
return index()[ind].offset;
|
||
|
|
}
|
||
|
|
|
||
|
|
bool valid_offset(size_t offset) const
|
||
|
|
{
|
||
|
|
return offset == 0
|
||
|
|
|| offset + 1 >= size() // last and first are always valid regardless of mark
|
||
|
|
|| (index()[offset].rule & mask_)!=0;
|
||
|
|
}
|
||
|
|
|
||
|
|
size_t size() const
|
||
|
|
{
|
||
|
|
return index().size();
|
||
|
|
}
|
||
|
|
|
||
|
|
index_type const &index() const
|
||
|
|
{
|
||
|
|
return map_->index();
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
boundary_point_type value_;
|
||
|
|
size_t current_;
|
||
|
|
mapping_type const *map_;
|
||
|
|
rule_type mask_;
|
||
|
|
};
|
||
|
|
|
||
|
|
|
||
|
|
} // details
|
||
|
|
|
||
|
|
/// \endcond
|
||
|
|
|
||
|
|
template<typename BaseIterator>
|
||
|
|
class segment_index;
|
||
|
|
|
||
|
|
template<typename BaseIterator>
|
||
|
|
class boundary_point_index;
|
||
|
|
|
||
|
|
|
||
|
|
///
|
||
|
|
/// \brief This class holds an index of segments in the text range and allows to iterate over them
|
||
|
|
///
|
||
|
|
/// This class is provides \ref begin() and \ref end() member functions that return bidirectional iterators
|
||
|
|
/// to the \ref segment objects.
|
||
|
|
///
|
||
|
|
/// It provides two options on way of selecting segments:
|
||
|
|
///
|
||
|
|
/// - \ref rule(rule_type mask) - a mask that allows to select only specific types of segments according to
|
||
|
|
/// various masks %as \ref word_any.
|
||
|
|
/// \n
|
||
|
|
/// The default is to select any types of boundaries.
|
||
|
|
/// \n
|
||
|
|
/// For example: using word %boundary analysis, when the provided mask is \ref word_kana then the iterators
|
||
|
|
/// would iterate only over the words containing Kana letters and \ref word_any would select all types of
|
||
|
|
/// words excluding ranges that consist of white space and punctuation marks. So iterating over the text
|
||
|
|
/// "to be or not to be?" with \ref word_any rule would return segments "to", "be", "or", "not", "to", "be", instead
|
||
|
|
/// of default "to", " ", "be", " ", "or", " ", "not", " ", "to", " ", "be", "?".
|
||
|
|
/// - \ref full_select(bool how) - a flag that defines the way a range is selected if the rule of the previous
|
||
|
|
/// %boundary point does not fit the selected rule.
|
||
|
|
/// \n
|
||
|
|
/// For example: We want to fetch all sentences from the following text: "Hello! How\nare you?".
|
||
|
|
/// \n
|
||
|
|
/// This text contains three %boundary points separating it to sentences by different rules:
|
||
|
|
/// - The exclamation mark "!" ends the sentence "Hello!"
|
||
|
|
/// - The line feed that splits the sentence "How\nare you?" into two parts.
|
||
|
|
/// - The question mark that ends the second sentence.
|
||
|
|
/// \n
|
||
|
|
/// If you would only change the \ref rule() to \ref sentence_term then the segment_index would
|
||
|
|
/// provide two sentences "Hello!" and "are you?" %as only them actually terminated with required
|
||
|
|
/// terminator "!" or "?". But changing \ref full_select() to true, the selected segment would include
|
||
|
|
/// all the text up to previous valid %boundary point and would return two expected sentences:
|
||
|
|
/// "Hello!" and "How\nare you?".
|
||
|
|
///
|
||
|
|
/// This class allows to find a segment according to the given iterator in range using \ref find() member
|
||
|
|
/// function.
|
||
|
|
///
|
||
|
|
/// \note
|
||
|
|
///
|
||
|
|
/// - Changing any of the options - \ref rule() or \ref full_select() and of course re-indexing the text
|
||
|
|
/// invalidates existing iterators and they can't be used any more.
|
||
|
|
/// - segment_index can be created from boundary_point_index or other segment_index that was created with
|
||
|
|
/// same \ref boundary_type. This is very fast operation %as they shared same index
|
||
|
|
/// and it does not require its regeneration.
|
||
|
|
///
|
||
|
|
/// \see
|
||
|
|
///
|
||
|
|
/// - \ref boundary_point_index
|
||
|
|
/// - \ref segment
|
||
|
|
/// - \ref boundary_point
|
||
|
|
///
|
||
|
|
|
||
|
|
template<typename BaseIterator>
|
||
|
|
class segment_index {
|
||
|
|
public:
|
||
|
|
|
||
|
|
///
|
||
|
|
/// The type of the iterator used to iterate over the original text
|
||
|
|
///
|
||
|
|
typedef BaseIterator base_iterator;
|
||
|
|
#ifdef BOOST_LOCALE_DOXYGEN
|
||
|
|
///
|
||
|
|
/// The bidirectional iterator that iterates over \ref value_type objects.
|
||
|
|
///
|
||
|
|
/// - The iterators may be invalidated by use of any non-const member function
|
||
|
|
/// including but not limited to \ref rule(rule_type) and \ref full_select(bool).
|
||
|
|
/// - The returned value_type object is valid %as long %as iterator points to it.
|
||
|
|
/// So this following code is wrong %as t used after p was updated:
|
||
|
|
/// \code
|
||
|
|
/// segment_index<some_iterator>::iterator p=index.begin();
|
||
|
|
/// segment<some_iterator> &t = *p;
|
||
|
|
/// ++p;
|
||
|
|
/// cout << t.str() << endl;
|
||
|
|
/// \endcode
|
||
|
|
///
|
||
|
|
typedef unspecified_iterator_type iterator;
|
||
|
|
///
|
||
|
|
/// \copydoc iterator
|
||
|
|
///
|
||
|
|
typedef unspecified_iterator_type const_iterator;
|
||
|
|
#else
|
||
|
|
typedef details::segment_index_iterator<base_iterator> iterator;
|
||
|
|
typedef details::segment_index_iterator<base_iterator> const_iterator;
|
||
|
|
#endif
|
||
|
|
///
|
||
|
|
/// The type dereferenced by the \ref iterator and \ref const_iterator. It is
|
||
|
|
/// an object that represents selected segment.
|
||
|
|
///
|
||
|
|
typedef segment<base_iterator> value_type;
|
||
|
|
|
||
|
|
///
|
||
|
|
/// Default constructor.
|
||
|
|
///
|
||
|
|
/// \note
|
||
|
|
///
|
||
|
|
/// When this object is constructed by default it does not include a valid index, thus
|
||
|
|
/// calling \ref begin(), \ref end() or \ref find() member functions would lead to undefined
|
||
|
|
/// behavior
|
||
|
|
///
|
||
|
|
segment_index() : mask_(0xFFFFFFFFu),full_select_(false)
|
||
|
|
{
|
||
|
|
}
|
||
|
|
///
|
||
|
|
/// Create a segment_index for %boundary analysis \ref boundary_type "type" of the text
|
||
|
|
/// in range [begin,end) using a rule \a mask for locale \a loc.
|
||
|
|
///
|
||
|
|
segment_index(boundary_type type,
|
||
|
|
base_iterator begin,
|
||
|
|
base_iterator end,
|
||
|
|
rule_type mask,
|
||
|
|
std::locale const &loc=std::locale())
|
||
|
|
:
|
||
|
|
map_(type,begin,end,loc),
|
||
|
|
mask_(mask),
|
||
|
|
full_select_(false)
|
||
|
|
{
|
||
|
|
}
|
||
|
|
///
|
||
|
|
/// Create a segment_index for %boundary analysis \ref boundary_type "type" of the text
|
||
|
|
/// in range [begin,end) selecting all possible segments (full mask) for locale \a loc.
|
||
|
|
///
|
||
|
|
segment_index(boundary_type type,
|
||
|
|
base_iterator begin,
|
||
|
|
base_iterator end,
|
||
|
|
std::locale const &loc=std::locale())
|
||
|
|
:
|
||
|
|
map_(type,begin,end,loc),
|
||
|
|
mask_(0xFFFFFFFFu),
|
||
|
|
full_select_(false)
|
||
|
|
{
|
||
|
|
}
|
||
|
|
|
||
|
|
///
|
||
|
|
/// Create a segment_index from a \ref boundary_point_index. It copies all indexing information
|
||
|
|
/// and used default rule (all possible segments)
|
||
|
|
///
|
||
|
|
/// This operation is very cheap, so if you use boundary_point_index and segment_index on same text
|
||
|
|
/// range it is much better to create one from another rather then indexing the same
|
||
|
|
/// range twice.
|
||
|
|
///
|
||
|
|
/// \note \ref rule() flags are not copied
|
||
|
|
///
|
||
|
|
segment_index(boundary_point_index<base_iterator> const &);
|
||
|
|
///
|
||
|
|
/// Copy an index from a \ref boundary_point_index. It copies all indexing information
|
||
|
|
/// and uses the default rule (all possible segments)
|
||
|
|
///
|
||
|
|
/// This operation is very cheap, so if you use boundary_point_index and segment_index on same text
|
||
|
|
/// range it is much better to create one from another rather then indexing the same
|
||
|
|
/// range twice.
|
||
|
|
///
|
||
|
|
/// \note \ref rule() flags are not copied
|
||
|
|
///
|
||
|
|
segment_index const &operator = (boundary_point_index<base_iterator> const &);
|
||
|
|
|
||
|
|
|
||
|
|
///
|
||
|
|
/// Create a new index for %boundary analysis \ref boundary_type "type" of the text
|
||
|
|
/// in range [begin,end) for locale \a loc.
|
||
|
|
///
|
||
|
|
/// \note \ref rule() and \ref full_select() remain unchanged.
|
||
|
|
///
|
||
|
|
void map(boundary_type type,base_iterator begin,base_iterator end,std::locale const &loc=std::locale())
|
||
|
|
{
|
||
|
|
map_ = mapping_type(type,begin,end,loc);
|
||
|
|
}
|
||
|
|
|
||
|
|
///
|
||
|
|
/// Get the \ref iterator on the beginning of the segments range.
|
||
|
|
///
|
||
|
|
/// Preconditions: the segment_index should have a mapping
|
||
|
|
///
|
||
|
|
/// \note
|
||
|
|
///
|
||
|
|
/// The returned iterator is invalidated by access to any non-const member functions of this object
|
||
|
|
///
|
||
|
|
iterator begin() const
|
||
|
|
{
|
||
|
|
return iterator(true,&map_,mask_,full_select_);
|
||
|
|
}
|
||
|
|
|
||
|
|
///
|
||
|
|
/// Get the \ref iterator on the ending of the segments range.
|
||
|
|
///
|
||
|
|
/// Preconditions: the segment_index should have a mapping
|
||
|
|
///
|
||
|
|
/// The returned iterator is invalidated by access to any non-const member functions of this object
|
||
|
|
///
|
||
|
|
iterator end() const
|
||
|
|
{
|
||
|
|
return iterator(false,&map_,mask_,full_select_);
|
||
|
|
}
|
||
|
|
|
||
|
|
///
|
||
|
|
/// Find a first valid segment following a position \a p.
|
||
|
|
///
|
||
|
|
/// If \a p is inside a valid segment this segment is selected:
|
||
|
|
///
|
||
|
|
/// For example: For \ref word %boundary analysis with \ref word_any rule():
|
||
|
|
///
|
||
|
|
/// - "to| be or ", would point to "be",
|
||
|
|
/// - "t|o be or ", would point to "to",
|
||
|
|
/// - "to be or| ", would point to end.
|
||
|
|
///
|
||
|
|
///
|
||
|
|
/// Preconditions: the segment_index should have a mapping and \a p should be valid iterator
|
||
|
|
/// to the text in the mapped range.
|
||
|
|
///
|
||
|
|
/// The returned iterator is invalidated by access to any non-const member functions of this object
|
||
|
|
///
|
||
|
|
iterator find(base_iterator p) const
|
||
|
|
{
|
||
|
|
return iterator(p,&map_,mask_,full_select_);
|
||
|
|
}
|
||
|
|
|
||
|
|
///
|
||
|
|
/// Get the mask of rules that are used
|
||
|
|
///
|
||
|
|
rule_type rule() const
|
||
|
|
{
|
||
|
|
return mask_;
|
||
|
|
}
|
||
|
|
///
|
||
|
|
/// Set the mask of rules that are used
|
||
|
|
///
|
||
|
|
void rule(rule_type v)
|
||
|
|
{
|
||
|
|
mask_ = v;
|
||
|
|
}
|
||
|
|
|
||
|
|
///
|
||
|
|
/// Get the full_select property value - should segment include in the range
|
||
|
|
/// values that not belong to specific \ref rule() or not.
|
||
|
|
///
|
||
|
|
/// The default value is false.
|
||
|
|
///
|
||
|
|
/// For example for \ref sentence %boundary with rule \ref sentence_term the segments
|
||
|
|
/// of text "Hello! How\nare you?" are "Hello!\", "are you?" when full_select() is false
|
||
|
|
/// because "How\n" is selected %as sentence by a rule spits the text by line feed. If full_select()
|
||
|
|
/// is true the returned segments are "Hello! ", "How\nare you?" where "How\n" is joined with the
|
||
|
|
/// following part "are you?"
|
||
|
|
///
|
||
|
|
|
||
|
|
bool full_select() const
|
||
|
|
{
|
||
|
|
return full_select_;
|
||
|
|
}
|
||
|
|
|
||
|
|
///
|
||
|
|
/// Set the full_select property value - should segment include in the range
|
||
|
|
/// values that not belong to specific \ref rule() or not.
|
||
|
|
///
|
||
|
|
/// The default value is false.
|
||
|
|
///
|
||
|
|
/// For example for \ref sentence %boundary with rule \ref sentence_term the segments
|
||
|
|
/// of text "Hello! How\nare you?" are "Hello!\", "are you?" when full_select() is false
|
||
|
|
/// because "How\n" is selected %as sentence by a rule spits the text by line feed. If full_select()
|
||
|
|
/// is true the returned segments are "Hello! ", "How\nare you?" where "How\n" is joined with the
|
||
|
|
/// following part "are you?"
|
||
|
|
///
|
||
|
|
|
||
|
|
void full_select(bool v)
|
||
|
|
{
|
||
|
|
full_select_ = v;
|
||
|
|
}
|
||
|
|
|
||
|
|
private:
|
||
|
|
friend class boundary_point_index<base_iterator>;
|
||
|
|
typedef details::mapping<base_iterator> mapping_type;
|
||
|
|
mapping_type map_;
|
||
|
|
rule_type mask_;
|
||
|
|
bool full_select_;
|
||
|
|
};
|
||
|
|
|
||
|
|
///
|
||
|
|
/// \brief This class holds an index of \ref boundary_point "boundary points" and allows iterating
|
||
|
|
/// over them.
|
||
|
|
///
|
||
|
|
/// This class is provides \ref begin() and \ref end() member functions that return bidirectional iterators
|
||
|
|
/// to the \ref boundary_point objects.
|
||
|
|
///
|
||
|
|
/// It provides an option that affects selecting %boundary points according to different rules:
|
||
|
|
/// using \ref rule(rule_type mask) member function. It allows to set a mask that select only specific
|
||
|
|
/// types of %boundary points like \ref sentence_term.
|
||
|
|
///
|
||
|
|
/// For example for a sentence %boundary analysis of a text "Hello! How\nare you?" when the default
|
||
|
|
/// rule is used the %boundary points would be:
|
||
|
|
///
|
||
|
|
/// - "|Hello! How\nare you?"
|
||
|
|
/// - "Hello! |How\nare you?"
|
||
|
|
/// - "Hello! How\n|are you?"
|
||
|
|
/// - "Hello! How\nare you?|"
|
||
|
|
///
|
||
|
|
/// However if \ref rule() is set to \ref sentence_term then the selected %boundary points would be:
|
||
|
|
///
|
||
|
|
/// - "|Hello! How\nare you?"
|
||
|
|
/// - "Hello! |How\nare you?"
|
||
|
|
/// - "Hello! How\nare you?|"
|
||
|
|
///
|
||
|
|
/// Such that a %boundary point defined by a line feed character would be ignored.
|
||
|
|
///
|
||
|
|
/// This class allows to find a boundary_point according to the given iterator in range using \ref find() member
|
||
|
|
/// function.
|
||
|
|
///
|
||
|
|
/// \note
|
||
|
|
/// - Even an empty text range [x,x) considered to have a one %boundary point x.
|
||
|
|
/// - \a a and \a b points of the range [a,b) are always considered %boundary points
|
||
|
|
/// regardless the rules used.
|
||
|
|
/// - Changing any of the option \ref rule() or course re-indexing the text
|
||
|
|
/// invalidates existing iterators and they can't be used any more.
|
||
|
|
/// - boundary_point_index can be created from segment_index or other boundary_point_index that was created with
|
||
|
|
/// same \ref boundary_type. This is very fast operation %as they shared same index
|
||
|
|
/// and it does not require its regeneration.
|
||
|
|
///
|
||
|
|
/// \see
|
||
|
|
///
|
||
|
|
/// - \ref segment_index
|
||
|
|
/// - \ref boundary_point
|
||
|
|
/// - \ref segment
|
||
|
|
///
|
||
|
|
|
||
|
|
|
||
|
|
template<typename BaseIterator>
|
||
|
|
class boundary_point_index {
|
||
|
|
public:
|
||
|
|
///
|
||
|
|
/// The type of the iterator used to iterate over the original text
|
||
|
|
///
|
||
|
|
typedef BaseIterator base_iterator;
|
||
|
|
#ifdef BOOST_LOCALE_DOXYGEN
|
||
|
|
///
|
||
|
|
/// The bidirectional iterator that iterates over \ref value_type objects.
|
||
|
|
///
|
||
|
|
/// - The iterators may be invalidated by use of any non-const member function
|
||
|
|
/// including but not limited to \ref rule(rule_type) member function.
|
||
|
|
/// - The returned value_type object is valid %as long %as iterator points to it.
|
||
|
|
/// So this following code is wrong %as t used after p was updated:
|
||
|
|
/// \code
|
||
|
|
/// boundary_point_index<some_iterator>::iterator p=index.begin();
|
||
|
|
/// boundary_point<some_iterator> &t = *p;
|
||
|
|
/// ++p;
|
||
|
|
/// rule_type r = t->rule();
|
||
|
|
/// \endcode
|
||
|
|
///
|
||
|
|
typedef unspecified_iterator_type iterator;
|
||
|
|
///
|
||
|
|
/// \copydoc iterator
|
||
|
|
///
|
||
|
|
typedef unspecified_iterator_type const_iterator;
|
||
|
|
#else
|
||
|
|
typedef details::boundary_point_index_iterator<base_iterator> iterator;
|
||
|
|
typedef details::boundary_point_index_iterator<base_iterator> const_iterator;
|
||
|
|
#endif
|
||
|
|
///
|
||
|
|
/// The type dereferenced by the \ref iterator and \ref const_iterator. It is
|
||
|
|
/// an object that represents the selected \ref boundary_point "boundary point".
|
||
|
|
///
|
||
|
|
typedef boundary_point<base_iterator> value_type;
|
||
|
|
|
||
|
|
///
|
||
|
|
/// Default constructor.
|
||
|
|
///
|
||
|
|
/// \note
|
||
|
|
///
|
||
|
|
/// When this object is constructed by default it does not include a valid index, thus
|
||
|
|
/// calling \ref begin(), \ref end() or \ref find() member functions would lead to undefined
|
||
|
|
/// behavior
|
||
|
|
///
|
||
|
|
boundary_point_index() : mask_(0xFFFFFFFFu)
|
||
|
|
{
|
||
|
|
}
|
||
|
|
|
||
|
|
///
|
||
|
|
/// Create a segment_index for %boundary analysis \ref boundary_type "type" of the text
|
||
|
|
/// in range [begin,end) using a rule \a mask for locale \a loc.
|
||
|
|
///
|
||
|
|
boundary_point_index(boundary_type type,
|
||
|
|
base_iterator begin,
|
||
|
|
base_iterator end,
|
||
|
|
rule_type mask,
|
||
|
|
std::locale const &loc=std::locale())
|
||
|
|
:
|
||
|
|
map_(type,begin,end,loc),
|
||
|
|
mask_(mask)
|
||
|
|
{
|
||
|
|
}
|
||
|
|
///
|
||
|
|
/// Create a segment_index for %boundary analysis \ref boundary_type "type" of the text
|
||
|
|
/// in range [begin,end) selecting all possible %boundary points (full mask) for locale \a loc.
|
||
|
|
///
|
||
|
|
boundary_point_index(boundary_type type,
|
||
|
|
base_iterator begin,
|
||
|
|
base_iterator end,
|
||
|
|
std::locale const &loc=std::locale())
|
||
|
|
:
|
||
|
|
map_(type,begin,end,loc),
|
||
|
|
mask_(0xFFFFFFFFu)
|
||
|
|
{
|
||
|
|
}
|
||
|
|
|
||
|
|
///
|
||
|
|
/// Create a boundary_point_index from a \ref segment_index. It copies all indexing information
|
||
|
|
/// and uses the default rule (all possible %boundary points)
|
||
|
|
///
|
||
|
|
/// This operation is very cheap, so if you use boundary_point_index and segment_index on same text
|
||
|
|
/// range it is much better to create one from another rather then indexing the same
|
||
|
|
/// range twice.
|
||
|
|
///
|
||
|
|
/// \note \ref rule() flags are not copied
|
||
|
|
///
|
||
|
|
boundary_point_index(segment_index<base_iterator> const &other);
|
||
|
|
///
|
||
|
|
/// Copy a boundary_point_index from a \ref segment_index. It copies all indexing information
|
||
|
|
/// and keeps the current \ref rule() unchanged
|
||
|
|
///
|
||
|
|
/// This operation is very cheap, so if you use boundary_point_index and segment_index on same text
|
||
|
|
/// range it is much better to create one from another rather then indexing the same
|
||
|
|
/// range twice.
|
||
|
|
///
|
||
|
|
/// \note \ref rule() flags are not copied
|
||
|
|
///
|
||
|
|
boundary_point_index const &operator=(segment_index<base_iterator> const &other);
|
||
|
|
|
||
|
|
///
|
||
|
|
/// Create a new index for %boundary analysis \ref boundary_type "type" of the text
|
||
|
|
/// in range [begin,end) for locale \a loc.
|
||
|
|
///
|
||
|
|
/// \note \ref rule() remains unchanged.
|
||
|
|
///
|
||
|
|
void map(boundary_type type,base_iterator begin,base_iterator end,std::locale const &loc=std::locale())
|
||
|
|
{
|
||
|
|
map_ = mapping_type(type,begin,end,loc);
|
||
|
|
}
|
||
|
|
|
||
|
|
///
|
||
|
|
/// Get the \ref iterator on the beginning of the %boundary points range.
|
||
|
|
///
|
||
|
|
/// Preconditions: this boundary_point_index should have a mapping
|
||
|
|
///
|
||
|
|
/// \note
|
||
|
|
///
|
||
|
|
/// The returned iterator is invalidated by access to any non-const member functions of this object
|
||
|
|
///
|
||
|
|
iterator begin() const
|
||
|
|
{
|
||
|
|
return iterator(true,&map_,mask_);
|
||
|
|
}
|
||
|
|
|
||
|
|
///
|
||
|
|
/// Get the \ref iterator on the ending of the %boundary points range.
|
||
|
|
///
|
||
|
|
/// Preconditions: this boundary_point_index should have a mapping
|
||
|
|
///
|
||
|
|
/// \note
|
||
|
|
///
|
||
|
|
/// The returned iterator is invalidated by access to any non-const member functions of this object
|
||
|
|
///
|
||
|
|
iterator end() const
|
||
|
|
{
|
||
|
|
return iterator(false,&map_,mask_);
|
||
|
|
}
|
||
|
|
|
||
|
|
///
|
||
|
|
/// Find a first valid %boundary point on a position \a p or following it.
|
||
|
|
///
|
||
|
|
/// For example: For \ref word %boundary analysis of the text "to be or"
|
||
|
|
///
|
||
|
|
/// - "|to be", would return %boundary point at "|to be",
|
||
|
|
/// - "t|o be", would point to "to| be"
|
||
|
|
///
|
||
|
|
/// Preconditions: the boundary_point_index should have a mapping and \a p should be valid iterator
|
||
|
|
/// to the text in the mapped range.
|
||
|
|
///
|
||
|
|
/// The returned iterator is invalidated by access to any non-const member functions of this object
|
||
|
|
///
|
||
|
|
iterator find(base_iterator p) const
|
||
|
|
{
|
||
|
|
return iterator(p,&map_,mask_);
|
||
|
|
}
|
||
|
|
|
||
|
|
///
|
||
|
|
/// Get the mask of rules that are used
|
||
|
|
///
|
||
|
|
rule_type rule() const
|
||
|
|
{
|
||
|
|
return mask_;
|
||
|
|
}
|
||
|
|
///
|
||
|
|
/// Set the mask of rules that are used
|
||
|
|
///
|
||
|
|
void rule(rule_type v)
|
||
|
|
{
|
||
|
|
mask_ = v;
|
||
|
|
}
|
||
|
|
|
||
|
|
private:
|
||
|
|
|
||
|
|
friend class segment_index<base_iterator>;
|
||
|
|
typedef details::mapping<base_iterator> mapping_type;
|
||
|
|
mapping_type map_;
|
||
|
|
rule_type mask_;
|
||
|
|
};
|
||
|
|
|
||
|
|
/// \cond INTERNAL
|
||
|
|
template<typename BaseIterator>
|
||
|
|
segment_index<BaseIterator>::segment_index(boundary_point_index<BaseIterator> const &other) :
|
||
|
|
map_(other.map_),
|
||
|
|
mask_(0xFFFFFFFFu),
|
||
|
|
full_select_(false)
|
||
|
|
{
|
||
|
|
}
|
||
|
|
|
||
|
|
template<typename BaseIterator>
|
||
|
|
boundary_point_index<BaseIterator>::boundary_point_index(segment_index<BaseIterator> const &other) :
|
||
|
|
map_(other.map_),
|
||
|
|
mask_(0xFFFFFFFFu)
|
||
|
|
{
|
||
|
|
}
|
||
|
|
|
||
|
|
template<typename BaseIterator>
|
||
|
|
segment_index<BaseIterator> const &segment_index<BaseIterator>::operator=(boundary_point_index<BaseIterator> const &other)
|
||
|
|
{
|
||
|
|
map_ = other.map_;
|
||
|
|
return *this;
|
||
|
|
}
|
||
|
|
|
||
|
|
template<typename BaseIterator>
|
||
|
|
boundary_point_index<BaseIterator> const &boundary_point_index<BaseIterator>::operator=(segment_index<BaseIterator> const &other)
|
||
|
|
{
|
||
|
|
map_ = other.map_;
|
||
|
|
return *this;
|
||
|
|
}
|
||
|
|
/// \endcond
|
||
|
|
|
||
|
|
typedef segment_index<std::string::const_iterator> ssegment_index; ///< convenience typedef
|
||
|
|
typedef segment_index<std::wstring::const_iterator> wssegment_index; ///< convenience typedef
|
||
|
|
#ifdef BOOST_LOCALE_ENABLE_CHAR16_T
|
||
|
|
typedef segment_index<std::u16string::const_iterator> u16ssegment_index;///< convenience typedef
|
||
|
|
#endif
|
||
|
|
#ifdef BOOST_LOCALE_ENABLE_CHAR32_T
|
||
|
|
typedef segment_index<std::u32string::const_iterator> u32ssegment_index;///< convenience typedef
|
||
|
|
#endif
|
||
|
|
|
||
|
|
typedef segment_index<char const *> csegment_index; ///< convenience typedef
|
||
|
|
typedef segment_index<wchar_t const *> wcsegment_index; ///< convenience typedef
|
||
|
|
#ifdef BOOST_LOCALE_ENABLE_CHAR16_T
|
||
|
|
typedef segment_index<char16_t const *> u16csegment_index; ///< convenience typedef
|
||
|
|
#endif
|
||
|
|
#ifdef BOOST_LOCALE_ENABLE_CHAR32_T
|
||
|
|
typedef segment_index<char32_t const *> u32csegment_index; ///< convenience typedef
|
||
|
|
#endif
|
||
|
|
|
||
|
|
typedef boundary_point_index<std::string::const_iterator> sboundary_point_index;///< convenience typedef
|
||
|
|
typedef boundary_point_index<std::wstring::const_iterator> wsboundary_point_index;///< convenience typedef
|
||
|
|
#ifdef BOOST_LOCALE_ENABLE_CHAR16_T
|
||
|
|
typedef boundary_point_index<std::u16string::const_iterator> u16sboundary_point_index;///< convenience typedef
|
||
|
|
#endif
|
||
|
|
#ifdef BOOST_LOCALE_ENABLE_CHAR32_T
|
||
|
|
typedef boundary_point_index<std::u32string::const_iterator> u32sboundary_point_index;///< convenience typedef
|
||
|
|
#endif
|
||
|
|
|
||
|
|
typedef boundary_point_index<char const *> cboundary_point_index; ///< convenience typedef
|
||
|
|
typedef boundary_point_index<wchar_t const *> wcboundary_point_index; ///< convenience typedef
|
||
|
|
#ifdef BOOST_LOCALE_ENABLE_CHAR16_T
|
||
|
|
typedef boundary_point_index<char16_t const *> u16cboundary_point_index;///< convenience typedef
|
||
|
|
#endif
|
||
|
|
#ifdef BOOST_LOCALE_ENABLE_CHAR32_T
|
||
|
|
typedef boundary_point_index<char32_t const *> u32cboundary_point_index;///< convenience typedef
|
||
|
|
#endif
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
} // boundary
|
||
|
|
|
||
|
|
} // locale
|
||
|
|
} // boost
|
||
|
|
|
||
|
|
///
|
||
|
|
/// \example boundary.cpp
|
||
|
|
/// Example of using segment_index
|
||
|
|
/// \example wboundary.cpp
|
||
|
|
/// Example of using segment_index over wide strings
|
||
|
|
///
|
||
|
|
|
||
|
|
#ifdef BOOST_MSVC
|
||
|
|
#pragma warning(pop)
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#endif
|
||
|
|
// vim: tabstop=4 expandtab shiftwidth=4 softtabstop=4
|