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+// Boost string_algo library finder.hpp header file ---------------------------//
+
+// Copyright Pavol Droba 2002-2006.
+//
+// Distributed under the Boost Software License, Version 1.0.
+// (See accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+
+// See http://www.boost.org/ for updates, documentation, and revision history.
+
+#ifndef BOOST_STRING_FINDER_DETAIL_HPP
+#define BOOST_STRING_FINDER_DETAIL_HPP
+
+#include <boost/algorithm/string/config.hpp>
+#include <boost/algorithm/string/constants.hpp>
+#include <boost/detail/iterator.hpp>
+
+#include <boost/range/iterator_range.hpp>
+#include <boost/range/begin.hpp>
+#include <boost/range/end.hpp>
+#include <boost/range/empty.hpp>
+#include <boost/range/as_literal.hpp>
+
+namespace boost {
+ namespace algorithm {
+ namespace detail {
+
+
+// find first functor -----------------------------------------------//
+
+ // find a subsequence in the sequence ( functor )
+ /*
+ Returns a pair <begin,end> marking the subsequence in the sequence.
+ If the find fails, functor returns <End,End>
+ */
+ template<typename SearchIteratorT,typename PredicateT>
+ struct first_finderF
+ {
+ typedef SearchIteratorT search_iterator_type;
+
+ // Construction
+ template< typename SearchT >
+ first_finderF( const SearchT& Search, PredicateT Comp ) :
+ m_Search(::boost::begin(Search), ::boost::end(Search)), m_Comp(Comp) {}
+ first_finderF(
+ search_iterator_type SearchBegin,
+ search_iterator_type SearchEnd,
+ PredicateT Comp ) :
+ m_Search(SearchBegin, SearchEnd), m_Comp(Comp) {}
+
+ // Operation
+ template< typename ForwardIteratorT >
+ iterator_range<ForwardIteratorT>
+ operator()(
+ ForwardIteratorT Begin,
+ ForwardIteratorT End ) const
+ {
+ typedef iterator_range<ForwardIteratorT> result_type;
+ typedef ForwardIteratorT input_iterator_type;
+
+ // Outer loop
+ for(input_iterator_type OuterIt=Begin;
+ OuterIt!=End;
+ ++OuterIt)
+ {
+ // Sanity check
+ if( boost::empty(m_Search) )
+ return result_type( End, End );
+
+ input_iterator_type InnerIt=OuterIt;
+ search_iterator_type SubstrIt=m_Search.begin();
+ for(;
+ InnerIt!=End && SubstrIt!=m_Search.end();
+ ++InnerIt,++SubstrIt)
+ {
+ if( !( m_Comp(*InnerIt,*SubstrIt) ) )
+ break;
+ }
+
+ // Substring matching succeeded
+ if ( SubstrIt==m_Search.end() )
+ return result_type( OuterIt, InnerIt );
+ }
+
+ return result_type( End, End );
+ }
+
+ private:
+ iterator_range<search_iterator_type> m_Search;
+ PredicateT m_Comp;
+ };
+
+// find last functor -----------------------------------------------//
+
+ // find the last match a subseqeunce in the sequence ( functor )
+ /*
+ Returns a pair <begin,end> marking the subsequence in the sequence.
+ If the find fails, returns <End,End>
+ */
+ template<typename SearchIteratorT, typename PredicateT>
+ struct last_finderF
+ {
+ typedef SearchIteratorT search_iterator_type;
+ typedef first_finderF<
+ search_iterator_type,
+ PredicateT> first_finder_type;
+
+ // Construction
+ template< typename SearchT >
+ last_finderF( const SearchT& Search, PredicateT Comp ) :
+ m_Search(::boost::begin(Search), ::boost::end(Search)), m_Comp(Comp) {}
+ last_finderF(
+ search_iterator_type SearchBegin,
+ search_iterator_type SearchEnd,
+ PredicateT Comp ) :
+ m_Search(SearchBegin, SearchEnd), m_Comp(Comp) {}
+
+ // Operation
+ template< typename ForwardIteratorT >
+ iterator_range<ForwardIteratorT>
+ operator()(
+ ForwardIteratorT Begin,
+ ForwardIteratorT End ) const
+ {
+ typedef iterator_range<ForwardIteratorT> result_type;
+
+ if( boost::empty(m_Search) )
+ return result_type( End, End );
+
+ typedef BOOST_STRING_TYPENAME boost::detail::
+ iterator_traits<ForwardIteratorT>::iterator_category category;
+
+ return findit( Begin, End, category() );
+ }
+
+ private:
+ // forward iterator
+ template< typename ForwardIteratorT >
+ iterator_range<ForwardIteratorT>
+ findit(
+ ForwardIteratorT Begin,
+ ForwardIteratorT End,
+ std::forward_iterator_tag ) const
+ {
+ typedef ForwardIteratorT input_iterator_type;
+ typedef iterator_range<ForwardIteratorT> result_type;
+
+ first_finder_type first_finder(
+ m_Search.begin(), m_Search.end(), m_Comp );
+
+ result_type M=first_finder( Begin, End );
+ result_type Last=M;
+
+ while( M )
+ {
+ Last=M;
+ M=first_finder( ::boost::end(M), End );
+ }
+
+ return Last;
+ }
+
+ // bidirectional iterator
+ template< typename ForwardIteratorT >
+ iterator_range<ForwardIteratorT>
+ findit(
+ ForwardIteratorT Begin,
+ ForwardIteratorT End,
+ std::bidirectional_iterator_tag ) const
+ {
+ typedef iterator_range<ForwardIteratorT> result_type;
+ typedef ForwardIteratorT input_iterator_type;
+
+ // Outer loop
+ for(input_iterator_type OuterIt=End;
+ OuterIt!=Begin; )
+ {
+ input_iterator_type OuterIt2=--OuterIt;
+
+ input_iterator_type InnerIt=OuterIt2;
+ search_iterator_type SubstrIt=m_Search.begin();
+ for(;
+ InnerIt!=End && SubstrIt!=m_Search.end();
+ ++InnerIt,++SubstrIt)
+ {
+ if( !( m_Comp(*InnerIt,*SubstrIt) ) )
+ break;
+ }
+
+ // Substring matching succeeded
+ if( SubstrIt==m_Search.end() )
+ return result_type( OuterIt2, InnerIt );
+ }
+
+ return result_type( End, End );
+ }
+
+ private:
+ iterator_range<search_iterator_type> m_Search;
+ PredicateT m_Comp;
+ };
+
+// find n-th functor -----------------------------------------------//
+
+ // find the n-th match of a subsequence in the sequence ( functor )
+ /*
+ Returns a pair <begin,end> marking the subsequence in the sequence.
+ If the find fails, returns <End,End>
+ */
+ template<typename SearchIteratorT, typename PredicateT>
+ struct nth_finderF
+ {
+ typedef SearchIteratorT search_iterator_type;
+ typedef first_finderF<
+ search_iterator_type,
+ PredicateT> first_finder_type;
+ typedef last_finderF<
+ search_iterator_type,
+ PredicateT> last_finder_type;
+
+ // Construction
+ template< typename SearchT >
+ nth_finderF(
+ const SearchT& Search,
+ int Nth,
+ PredicateT Comp) :
+ m_Search(::boost::begin(Search), ::boost::end(Search)),
+ m_Nth(Nth),
+ m_Comp(Comp) {}
+ nth_finderF(
+ search_iterator_type SearchBegin,
+ search_iterator_type SearchEnd,
+ int Nth,
+ PredicateT Comp) :
+ m_Search(SearchBegin, SearchEnd),
+ m_Nth(Nth),
+ m_Comp(Comp) {}
+
+ // Operation
+ template< typename ForwardIteratorT >
+ iterator_range<ForwardIteratorT>
+ operator()(
+ ForwardIteratorT Begin,
+ ForwardIteratorT End ) const
+ {
+ if(m_Nth>=0)
+ {
+ return find_forward(Begin, End, m_Nth);
+ }
+ else
+ {
+ return find_backward(Begin, End, -m_Nth);
+ }
+
+ }
+
+ private:
+ // Implementation helpers
+ template< typename ForwardIteratorT >
+ iterator_range<ForwardIteratorT>
+ find_forward(
+ ForwardIteratorT Begin,
+ ForwardIteratorT End,
+ unsigned int N) const
+ {
+ typedef ForwardIteratorT input_iterator_type;
+ typedef iterator_range<ForwardIteratorT> result_type;
+
+ // Sanity check
+ if( boost::empty(m_Search) )
+ return result_type( End, End );
+
+ // Instantiate find functor
+ first_finder_type first_finder(
+ m_Search.begin(), m_Search.end(), m_Comp );
+
+ result_type M( Begin, Begin );
+
+ for( unsigned int n=0; n<=N; ++n )
+ {
+ // find next match
+ M=first_finder( ::boost::end(M), End );
+
+ if ( !M )
+ {
+ // Subsequence not found, return
+ return M;
+ }
+ }
+
+ return M;
+ }
+
+ template< typename ForwardIteratorT >
+ iterator_range<ForwardIteratorT>
+ find_backward(
+ ForwardIteratorT Begin,
+ ForwardIteratorT End,
+ unsigned int N) const
+ {
+ typedef ForwardIteratorT input_iterator_type;
+ typedef iterator_range<ForwardIteratorT> result_type;
+
+ // Sanity check
+ if( boost::empty(m_Search) )
+ return result_type( End, End );
+
+ // Instantiate find functor
+ last_finder_type last_finder(
+ m_Search.begin(), m_Search.end(), m_Comp );
+
+ result_type M( End, End );
+
+ for( unsigned int n=1; n<=N; ++n )
+ {
+ // find next match
+ M=last_finder( Begin, ::boost::begin(M) );
+
+ if ( !M )
+ {
+ // Subsequence not found, return
+ return M;
+ }
+ }
+
+ return M;
+ }
+
+
+ private:
+ iterator_range<search_iterator_type> m_Search;
+ int m_Nth;
+ PredicateT m_Comp;
+ };
+
+// find head/tail implementation helpers ---------------------------//
+
+ template<typename ForwardIteratorT>
+ iterator_range<ForwardIteratorT>
+ find_head_impl(
+ ForwardIteratorT Begin,
+ ForwardIteratorT End,
+ unsigned int N,
+ std::forward_iterator_tag )
+ {
+ typedef ForwardIteratorT input_iterator_type;
+ typedef iterator_range<ForwardIteratorT> result_type;
+
+ input_iterator_type It=Begin;
+ for(
+ unsigned int Index=0;
+ Index<N && It!=End; ++Index,++It ) {};
+
+ return result_type( Begin, It );
+ }
+
+ template< typename ForwardIteratorT >
+ iterator_range<ForwardIteratorT>
+ find_head_impl(
+ ForwardIteratorT Begin,
+ ForwardIteratorT End,
+ unsigned int N,
+ std::random_access_iterator_tag )
+ {
+ typedef ForwardIteratorT input_iterator_type;
+ typedef iterator_range<ForwardIteratorT> result_type;
+
+ if ( (End<=Begin) || ( static_cast<unsigned int>(End-Begin) < N ) )
+ return result_type( Begin, End );
+
+ return result_type(Begin,Begin+N);
+ }
+
+ // Find head implementation
+ template<typename ForwardIteratorT>
+ iterator_range<ForwardIteratorT>
+ find_head_impl(
+ ForwardIteratorT Begin,
+ ForwardIteratorT End,
+ unsigned int N )
+ {
+ typedef BOOST_STRING_TYPENAME boost::detail::
+ iterator_traits<ForwardIteratorT>::iterator_category category;
+
+ return find_head_impl( Begin, End, N, category() );
+ }
+
+ template< typename ForwardIteratorT >
+ iterator_range<ForwardIteratorT>
+ find_tail_impl(
+ ForwardIteratorT Begin,
+ ForwardIteratorT End,
+ unsigned int N,
+ std::forward_iterator_tag )
+ {
+ typedef ForwardIteratorT input_iterator_type;
+ typedef iterator_range<ForwardIteratorT> result_type;
+
+ unsigned int Index=0;
+ input_iterator_type It=Begin;
+ input_iterator_type It2=Begin;
+
+ // Advance It2 by N increments
+ for( Index=0; Index<N && It2!=End; ++Index,++It2 ) {};
+
+ // Advance It, It2 to the end
+ for(; It2!=End; ++It,++It2 ) {};
+
+ return result_type( It, It2 );
+ }
+
+ template< typename ForwardIteratorT >
+ iterator_range<ForwardIteratorT>
+ find_tail_impl(
+ ForwardIteratorT Begin,
+ ForwardIteratorT End,
+ unsigned int N,
+ std::bidirectional_iterator_tag )
+ {
+ typedef ForwardIteratorT input_iterator_type;
+ typedef iterator_range<ForwardIteratorT> result_type;
+
+ input_iterator_type It=End;
+ for(
+ unsigned int Index=0;
+ Index<N && It!=Begin; ++Index,--It ) {};
+
+ return result_type( It, End );
+ }
+
+ template< typename ForwardIteratorT >
+ iterator_range<ForwardIteratorT>
+ find_tail_impl(
+ ForwardIteratorT Begin,
+ ForwardIteratorT End,
+ unsigned int N,
+ std::random_access_iterator_tag )
+ {
+ typedef ForwardIteratorT input_iterator_type;
+ typedef iterator_range<ForwardIteratorT> result_type;
+
+ if ( (End<=Begin) || ( static_cast<unsigned int>(End-Begin) < N ) )
+ return result_type( Begin, End );
+
+ return result_type( End-N, End );
+ }
+
+ // Operation
+ template< typename ForwardIteratorT >
+ iterator_range<ForwardIteratorT>
+ find_tail_impl(
+ ForwardIteratorT Begin,
+ ForwardIteratorT End,
+ unsigned int N )
+ {
+ typedef BOOST_STRING_TYPENAME boost::detail::
+ iterator_traits<ForwardIteratorT>::iterator_category category;
+
+ return find_tail_impl( Begin, End, N, category() );
+ }
+
+
+
+// find head functor -----------------------------------------------//
+
+
+ // find a head in the sequence ( functor )
+ /*
+ This functor find a head of the specified range. For
+ a specified N, the head is a subsequence of N starting
+ elements of the range.
+ */
+ struct head_finderF
+ {
+ // Construction
+ head_finderF( int N ) : m_N(N) {}
+
+ // Operation
+ template< typename ForwardIteratorT >
+ iterator_range<ForwardIteratorT>
+ operator()(
+ ForwardIteratorT Begin,
+ ForwardIteratorT End ) const
+ {
+ if(m_N>=0)
+ {
+ return find_head_impl( Begin, End, m_N );
+ }
+ else
+ {
+ iterator_range<ForwardIteratorT> Res=
+ find_tail_impl( Begin, End, -m_N );
+
+ return make_iterator_range(Begin, Res.begin());
+ }
+ }
+
+ private:
+ int m_N;
+ };
+
+// find tail functor -----------------------------------------------//
+
+
+ // find a tail in the sequence ( functor )
+ /*
+ This functor find a tail of the specified range. For
+ a specified N, the head is a subsequence of N starting
+ elements of the range.
+ */
+ struct tail_finderF
+ {
+ // Construction
+ tail_finderF( int N ) : m_N(N) {}
+
+ // Operation
+ template< typename ForwardIteratorT >
+ iterator_range<ForwardIteratorT>
+ operator()(
+ ForwardIteratorT Begin,
+ ForwardIteratorT End ) const
+ {
+ if(m_N>=0)
+ {
+ return find_tail_impl( Begin, End, m_N );
+ }
+ else
+ {
+ iterator_range<ForwardIteratorT> Res=
+ find_head_impl( Begin, End, -m_N );
+
+ return make_iterator_range(Res.end(), End);
+ }
+ }
+
+ private:
+ int m_N;
+ };
+
+// find token functor -----------------------------------------------//
+
+ // find a token in a sequence ( functor )
+ /*
+ This find functor finds a token specified be a predicate
+ in a sequence. It is equivalent of std::find algorithm,
+ with an exception that it return range instead of a single
+ iterator.
+
+ If bCompress is set to true, adjacent matching tokens are
+ concatenated into one match.
+ */
+ template< typename PredicateT >
+ struct token_finderF
+ {
+ // Construction
+ token_finderF(
+ PredicateT Pred,
+ token_compress_mode_type eCompress=token_compress_off ) :
+ m_Pred(Pred), m_eCompress(eCompress) {}
+
+ // Operation
+ template< typename ForwardIteratorT >
+ iterator_range<ForwardIteratorT>
+ operator()(
+ ForwardIteratorT Begin,
+ ForwardIteratorT End ) const
+ {
+ typedef iterator_range<ForwardIteratorT> result_type;
+
+ ForwardIteratorT It=std::find_if( Begin, End, m_Pred );
+
+ if( It==End )
+ {
+ return result_type( End, End );
+ }
+ else
+ {
+ ForwardIteratorT It2=It;
+
+ if( m_eCompress==token_compress_on )
+ {
+ // Find first non-matching character
+ while( It2!=End && m_Pred(*It2) ) ++It2;
+ }
+ else
+ {
+ // Advance by one position
+ ++It2;
+ }
+
+ return result_type( It, It2 );
+ }
+ }
+
+ private:
+ PredicateT m_Pred;
+ token_compress_mode_type m_eCompress;
+ };
+
+// find range functor -----------------------------------------------//
+
+ // find a range in the sequence ( functor )
+ /*
+ This functor actually does not perform any find operation.
+ It always returns given iterator range as a result.
+ */
+ template<typename ForwardIterator1T>
+ struct range_finderF
+ {
+ typedef ForwardIterator1T input_iterator_type;
+ typedef iterator_range<input_iterator_type> result_type;
+
+ // Construction
+ range_finderF(
+ input_iterator_type Begin,
+ input_iterator_type End ) : m_Range(Begin, End) {}
+
+ range_finderF(const iterator_range<input_iterator_type>& Range) :
+ m_Range(Range) {}
+
+ // Operation
+ template< typename ForwardIterator2T >
+ iterator_range<ForwardIterator2T>
+ operator()(
+ ForwardIterator2T,
+ ForwardIterator2T ) const
+ {
+#if BOOST_WORKAROUND( __MWERKS__, <= 0x3003 )
+ return iterator_range<const ForwardIterator2T>(this->m_Range);
+#elif BOOST_WORKAROUND(BOOST_MSVC, <= 1300)
+ return iterator_range<ForwardIterator2T>(m_Range.begin(), m_Range.end());
+#else
+ return m_Range;
+#endif
+ }
+
+ private:
+ iterator_range<input_iterator_type> m_Range;
+ };
+
+
+ } // namespace detail
+ } // namespace algorithm
+} // namespace boost
+
+#endif // BOOST_STRING_FINDER_DETAIL_HPP