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