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484 lines
15 KiB
484 lines
15 KiB
// |
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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_SEGMENT_HPP_INCLUDED |
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#define BOOST_LOCALE_BOUNDARY_SEGMENT_HPP_INCLUDED |
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#include <boost/locale/config.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 <locale> |
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#include <string> |
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#include <iosfwd> |
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#include <iterator> |
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namespace boost { |
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namespace locale { |
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namespace boundary { |
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/// \cond INTERNAL |
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namespace details { |
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template<typename LeftIterator,typename RightIterator> |
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int compare_text(LeftIterator l_begin,LeftIterator l_end,RightIterator r_begin,RightIterator r_end) |
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{ |
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typedef LeftIterator left_iterator; |
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typedef RightIterator right_iterator; |
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typedef typename std::iterator_traits<left_iterator>::value_type char_type; |
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typedef std::char_traits<char_type> traits; |
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while(l_begin!=l_end && r_begin!=r_end) { |
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char_type lchar = *l_begin++; |
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char_type rchar = *r_begin++; |
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if(traits::eq(lchar,rchar)) |
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continue; |
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if(traits::lt(lchar,rchar)) |
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return -1; |
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else |
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return 1; |
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} |
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if(l_begin==l_end && r_begin==r_end) |
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return 0; |
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if(l_begin==l_end) |
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return -1; |
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else |
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return 1; |
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} |
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template<typename Left,typename Right> |
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int compare_text(Left const &l,Right const &r) |
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{ |
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return compare_text(l.begin(),l.end(),r.begin(),r.end()); |
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} |
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template<typename Left,typename Char> |
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int compare_string(Left const &l,Char const *begin) |
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{ |
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Char const *end = begin; |
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while(*end!=0) |
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end++; |
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return compare_text(l.begin(),l.end(),begin,end); |
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} |
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template<typename Right,typename Char> |
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int compare_string(Char const *begin,Right const &r) |
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{ |
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Char const *end = begin; |
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while(*end!=0) |
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end++; |
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return compare_text(begin,end,r.begin(),r.end()); |
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} |
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} |
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/// \endcond |
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/// |
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/// \addtogroup boundary |
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/// @{ |
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/// |
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/// \brief a segment object that represents a pair of two iterators that define the range where |
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/// this segment exits and a rule that defines it. |
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/// |
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/// This type of object is dereferenced by the iterators of segment_index. Using a rule() member function |
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/// you can get a specific rule this segment was selected with. For example, when you use |
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/// word boundary analysis, you can check if the specific word contains Kana letters by checking (rule() & \ref word_kana)!=0 |
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/// For a sentence analysis you can check if the sentence is selected because a sentence terminator is found (\ref sentence_term) or |
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/// there is a line break (\ref sentence_sep). |
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/// |
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/// This object can be automatically converted to std::basic_string with the same type of character. It is also |
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/// valid range that has begin() and end() member functions returning iterators on the location of the segment. |
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/// |
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/// \see |
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/// |
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/// - \ref segment_index |
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/// - \ref boundary_point |
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/// - \ref boundary_point_index |
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/// |
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template<typename IteratorType> |
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class segment : public std::pair<IteratorType,IteratorType> { |
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public: |
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/// |
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/// The type of the underlying character |
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/// |
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typedef typename std::iterator_traits<IteratorType>::value_type char_type; |
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/// |
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/// The type of the string it is converted to |
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/// |
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typedef std::basic_string<char_type> string_type; |
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/// |
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/// The value that iterators return - the character itself |
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/// |
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typedef char_type value_type; |
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/// |
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/// The iterator that allows to iterate the range |
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/// |
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typedef IteratorType iterator; |
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/// |
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/// The iterator that allows to iterate the range |
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/// |
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typedef IteratorType const_iterator; |
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/// |
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/// The type that represent a difference between two iterators |
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/// |
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typedef typename std::iterator_traits<IteratorType>::difference_type difference_type; |
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/// |
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/// Default constructor |
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/// |
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segment() {} |
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/// |
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/// Create a segment using two iterators and a rule that represents this point |
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/// |
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segment(iterator b,iterator e,rule_type r) : |
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std::pair<IteratorType,IteratorType>(b,e), |
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rule_(r) |
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{ |
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} |
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/// |
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/// Set the start of the range |
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/// |
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void begin(iterator const &v) |
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{ |
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this->first = v; |
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} |
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/// |
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/// Set the end of the range |
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/// |
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void end(iterator const &v) |
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{ |
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this->second = v; |
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} |
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/// |
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/// Get the start of the range |
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/// |
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IteratorType begin() const |
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{ |
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return this->first; |
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} |
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/// |
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/// Set the end of the range |
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/// |
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IteratorType end() const |
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{ |
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return this->second; |
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} |
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/// |
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/// Convert the range to a string automatically |
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/// |
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template <class T, class A> |
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operator std::basic_string<char_type, T, A> ()const |
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{ |
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return std::basic_string<char_type, T, A>(this->first, this->second); |
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} |
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/// |
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/// Create a string from the range explicitly |
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/// |
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string_type str() const |
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{ |
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return string_type(begin(),end()); |
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} |
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/// |
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/// Get the length of the text chunk |
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/// |
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size_t length() const |
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{ |
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return std::distance(begin(),end()); |
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} |
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/// |
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/// Check if the segment is empty |
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/// |
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bool empty() const |
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{ |
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return begin() == end(); |
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} |
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/// |
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/// Get the rule that is used for selection of this segment. |
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/// |
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rule_type rule() const |
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{ |
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return rule_; |
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} |
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/// |
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/// Set a rule that is used for segment selection |
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/// |
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void rule(rule_type r) |
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{ |
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rule_ = r; |
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} |
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// make sure we override std::pair's operator== |
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/// Compare two segments |
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bool operator==(segment const &other) |
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{ |
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return details::compare_text(*this,other) == 0; |
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} |
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/// Compare two segments |
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bool operator!=(segment const &other) |
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{ |
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return details::compare_text(*this,other) != 0; |
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} |
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private: |
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rule_type rule_; |
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}; |
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/// Compare two segments |
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template<typename IteratorL,typename IteratorR> |
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bool operator==(segment<IteratorL> const &l,segment<IteratorR> const &r) |
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{ |
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return details::compare_text(l,r) == 0; |
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} |
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/// Compare two segments |
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template<typename IteratorL,typename IteratorR> |
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bool operator!=(segment<IteratorL> const &l,segment<IteratorR> const &r) |
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{ |
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return details::compare_text(l,r) != 0; |
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} |
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/// Compare two segments |
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template<typename IteratorL,typename IteratorR> |
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bool operator<(segment<IteratorL> const &l,segment<IteratorR> const &r) |
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{ |
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return details::compare_text(l,r) < 0; |
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} |
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/// Compare two segments |
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template<typename IteratorL,typename IteratorR> |
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bool operator<=(segment<IteratorL> const &l,segment<IteratorR> const &r) |
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{ |
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return details::compare_text(l,r) <= 0; |
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} |
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/// Compare two segments |
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template<typename IteratorL,typename IteratorR> |
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bool operator>(segment<IteratorL> const &l,segment<IteratorR> const &r) |
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{ |
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return details::compare_text(l,r) > 0; |
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} |
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/// Compare two segments |
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template<typename IteratorL,typename IteratorR> |
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bool operator>=(segment<IteratorL> const &l,segment<IteratorR> const &r) |
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{ |
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return details::compare_text(l,r) >= 0; |
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} |
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/// Compare string and segment |
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template<typename CharType,typename Traits,typename Alloc,typename IteratorR> |
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bool operator==(std::basic_string<CharType,Traits,Alloc> const &l,segment<IteratorR> const &r) |
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{ |
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return details::compare_text(l,r) == 0; |
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} |
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/// Compare string and segment |
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template<typename CharType,typename Traits,typename Alloc,typename IteratorR> |
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bool operator!=(std::basic_string<CharType,Traits,Alloc> const &l,segment<IteratorR> const &r) |
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{ |
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return details::compare_text(l,r) != 0; |
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} |
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/// Compare string and segment |
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template<typename CharType,typename Traits,typename Alloc,typename IteratorR> |
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bool operator<(std::basic_string<CharType,Traits,Alloc> const &l,segment<IteratorR> const &r) |
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{ |
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return details::compare_text(l,r) < 0; |
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} |
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/// Compare string and segment |
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template<typename CharType,typename Traits,typename Alloc,typename IteratorR> |
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bool operator<=(std::basic_string<CharType,Traits,Alloc> const &l,segment<IteratorR> const &r) |
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{ |
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return details::compare_text(l,r) <= 0; |
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} |
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/// Compare string and segment |
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template<typename CharType,typename Traits,typename Alloc,typename IteratorR> |
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bool operator>(std::basic_string<CharType,Traits,Alloc> const &l,segment<IteratorR> const &r) |
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{ |
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return details::compare_text(l,r) > 0; |
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} |
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/// Compare string and segment |
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template<typename CharType,typename Traits,typename Alloc,typename IteratorR> |
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bool operator>=(std::basic_string<CharType,Traits,Alloc> const &l,segment<IteratorR> const &r) |
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{ |
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return details::compare_text(l,r) >= 0; |
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} |
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/// Compare string and segment |
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template<typename Iterator,typename CharType,typename Traits,typename Alloc> |
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bool operator==(segment<Iterator> const &l,std::basic_string<CharType,Traits,Alloc> const &r) |
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{ |
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return details::compare_text(l,r) == 0; |
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} |
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/// Compare string and segment |
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template<typename Iterator,typename CharType,typename Traits,typename Alloc> |
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bool operator!=(segment<Iterator> const &l,std::basic_string<CharType,Traits,Alloc> const &r) |
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{ |
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return details::compare_text(l,r) != 0; |
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} |
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/// Compare string and segment |
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template<typename Iterator,typename CharType,typename Traits,typename Alloc> |
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bool operator<(segment<Iterator> const &l,std::basic_string<CharType,Traits,Alloc> const &r) |
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{ |
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return details::compare_text(l,r) < 0; |
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} |
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/// Compare string and segment |
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template<typename Iterator,typename CharType,typename Traits,typename Alloc> |
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bool operator<=(segment<Iterator> const &l,std::basic_string<CharType,Traits,Alloc> const &r) |
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{ |
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return details::compare_text(l,r) <= 0; |
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} |
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/// Compare string and segment |
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template<typename Iterator,typename CharType,typename Traits,typename Alloc> |
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bool operator>(segment<Iterator> const &l,std::basic_string<CharType,Traits,Alloc> const &r) |
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{ |
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return details::compare_text(l,r) > 0; |
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} |
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/// Compare string and segment |
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template<typename Iterator,typename CharType,typename Traits,typename Alloc> |
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bool operator>=(segment<Iterator> const &l,std::basic_string<CharType,Traits,Alloc> const &r) |
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{ |
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return details::compare_text(l,r) >= 0; |
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} |
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/// Compare C string and segment |
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template<typename CharType,typename IteratorR> |
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bool operator==(CharType const *l,segment<IteratorR> const &r) |
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{ |
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return details::compare_string(l,r) == 0; |
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} |
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/// Compare C string and segment |
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template<typename CharType,typename IteratorR> |
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bool operator!=(CharType const *l,segment<IteratorR> const &r) |
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{ |
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return details::compare_string(l,r) != 0; |
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} |
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/// Compare C string and segment |
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template<typename CharType,typename IteratorR> |
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bool operator<(CharType const *l,segment<IteratorR> const &r) |
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{ |
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return details::compare_string(l,r) < 0; |
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} |
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/// Compare C string and segment |
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template<typename CharType,typename IteratorR> |
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bool operator<=(CharType const *l,segment<IteratorR> const &r) |
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{ |
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return details::compare_string(l,r) <= 0; |
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} |
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/// Compare C string and segment |
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template<typename CharType,typename IteratorR> |
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bool operator>(CharType const *l,segment<IteratorR> const &r) |
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{ |
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return details::compare_string(l,r) > 0; |
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} |
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/// Compare C string and segment |
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template<typename CharType,typename IteratorR> |
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bool operator>=(CharType const *l,segment<IteratorR> const &r) |
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{ |
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return details::compare_string(l,r) >= 0; |
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} |
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/// Compare C string and segment |
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template<typename Iterator,typename CharType> |
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bool operator==(segment<Iterator> const &l,CharType const *r) |
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{ |
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return details::compare_string(l,r) == 0; |
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} |
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/// Compare C string and segment |
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template<typename Iterator,typename CharType> |
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bool operator!=(segment<Iterator> const &l,CharType const *r) |
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{ |
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return details::compare_string(l,r) != 0; |
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} |
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/// Compare C string and segment |
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template<typename Iterator,typename CharType> |
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bool operator<(segment<Iterator> const &l,CharType const *r) |
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{ |
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return details::compare_string(l,r) < 0; |
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} |
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/// Compare C string and segment |
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template<typename Iterator,typename CharType> |
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bool operator<=(segment<Iterator> const &l,CharType const *r) |
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{ |
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return details::compare_string(l,r) <= 0; |
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} |
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/// Compare C string and segment |
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template<typename Iterator,typename CharType> |
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bool operator>(segment<Iterator> const &l,CharType const *r) |
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{ |
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return details::compare_string(l,r) > 0; |
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} |
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/// Compare C string and segment |
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template<typename Iterator,typename CharType> |
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bool operator>=(segment<Iterator> const &l,CharType const *r) |
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{ |
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return details::compare_string(l,r) >= 0; |
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} |
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typedef segment<std::string::const_iterator> ssegment; ///< convenience typedef |
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typedef segment<std::wstring::const_iterator> wssegment; ///< convenience typedef |
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#ifdef BOOST_HAS_CHAR16_T |
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typedef segment<std::u16string::const_iterator> u16ssegment;///< convenience typedef |
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#endif |
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#ifdef BOOST_HAS_CHAR32_T |
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typedef segment<std::u32string::const_iterator> u32ssegment;///< convenience typedef |
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#endif |
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typedef segment<char const *> csegment; ///< convenience typedef |
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typedef segment<wchar_t const *> wcsegment; ///< convenience typedef |
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#ifdef BOOST_HAS_CHAR16_T |
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typedef segment<char16_t const *> u16csegment; ///< convenience typedef |
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#endif |
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#ifdef BOOST_HAS_CHAR32_T |
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typedef segment<char32_t const *> u32csegment; ///< convenience typedef |
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#endif |
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/// |
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/// Write the segment to the stream character by character |
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/// |
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template<typename CharType,typename TraitsType,typename Iterator> |
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std::basic_ostream<CharType,TraitsType> &operator<<( |
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std::basic_ostream<CharType,TraitsType> &out, |
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segment<Iterator> const &tok) |
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{ |
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for(Iterator p=tok.begin(),e=tok.end();p!=e;++p) |
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out << *p; |
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return out; |
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} |
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/// @} |
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} // boundary |
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} // locale |
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} // boost |
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#ifdef BOOST_MSVC |
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#pragma warning(pop) |
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#endif |
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#endif |
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// vim: tabstop=4 expandtab shiftwidth=4 softtabstop=4
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