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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(begin(Search), 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(begin(Search), 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( 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(begin(Search), 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( 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, 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
|
