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Diffstat (limited to 'boost/algorithm/string/detail/replace_storage.hpp')
| -rw-r--r-- | boost/algorithm/string/detail/replace_storage.hpp | 159 |
1 files changed, 159 insertions, 0 deletions
diff --git a/boost/algorithm/string/detail/replace_storage.hpp b/boost/algorithm/string/detail/replace_storage.hpp new file mode 100644 index 000000000..db35e4c53 --- /dev/null +++ b/boost/algorithm/string/detail/replace_storage.hpp @@ -0,0 +1,159 @@ +// Boost string_algo library replace_storage.hpp header file ---------------------------// + +// Copyright Pavol Droba 2002-2003. +// +// 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_REPLACE_STORAGE_DETAIL_HPP +#define BOOST_STRING_REPLACE_STORAGE_DETAIL_HPP + +#include <boost/algorithm/string/config.hpp> +#include <algorithm> +#include <boost/mpl/bool.hpp> +#include <boost/algorithm/string/sequence_traits.hpp> +#include <boost/algorithm/string/detail/sequence.hpp> + +namespace boost { + namespace algorithm { + namespace detail { + +// storage handling routines -----------------------------------------------// + + template< typename StorageT, typename OutputIteratorT > + inline OutputIteratorT move_from_storage( + StorageT& Storage, + OutputIteratorT DestBegin, + OutputIteratorT DestEnd ) + { + OutputIteratorT OutputIt=DestBegin; + + while( !Storage.empty() && OutputIt!=DestEnd ) + { + *OutputIt=Storage.front(); + Storage.pop_front(); + ++OutputIt; + } + + return OutputIt; + } + + template< typename StorageT, typename WhatT > + inline void copy_to_storage( + StorageT& Storage, + const WhatT& What ) + { + Storage.insert( Storage.end(), ::boost::begin(What), ::boost::end(What) ); + } + + +// process segment routine -----------------------------------------------// + + template< bool HasStableIterators > + struct process_segment_helper + { + // Optimized version of process_segment for generic sequence + template< + typename StorageT, + typename InputT, + typename ForwardIteratorT > + ForwardIteratorT operator()( + StorageT& Storage, + InputT& /*Input*/, + ForwardIteratorT InsertIt, + ForwardIteratorT SegmentBegin, + ForwardIteratorT SegmentEnd ) + { + // Copy data from the storage until the beginning of the segment + ForwardIteratorT It=::boost::algorithm::detail::move_from_storage( Storage, InsertIt, SegmentBegin ); + + // 3 cases are possible : + // a) Storage is empty, It==SegmentBegin + // b) Storage is empty, It!=SegmentBegin + // c) Storage is not empty + + if( Storage.empty() ) + { + if( It==SegmentBegin ) + { + // Case a) everything is grand, just return end of segment + return SegmentEnd; + } + else + { + // Case b) move the segment backwards + return std::copy( SegmentBegin, SegmentEnd, It ); + } + } + else + { + // Case c) -> shift the segment to the left and keep the overlap in the storage + while( It!=SegmentEnd ) + { + // Store value into storage + Storage.push_back( *It ); + // Get the top from the storage and put it here + *It=Storage.front(); + Storage.pop_front(); + + // Advance + ++It; + } + + return It; + } + } + }; + + template<> + struct process_segment_helper< true > + { + // Optimized version of process_segment for list-like sequence + template< + typename StorageT, + typename InputT, + typename ForwardIteratorT > + ForwardIteratorT operator()( + StorageT& Storage, + InputT& Input, + ForwardIteratorT InsertIt, + ForwardIteratorT SegmentBegin, + ForwardIteratorT SegmentEnd ) + + { + // Call replace to do the job + ::boost::algorithm::detail::replace( Input, InsertIt, SegmentBegin, Storage ); + // Empty the storage + Storage.clear(); + // Iterators were not changed, simply return the end of segment + return SegmentEnd; + } + }; + + // Process one segment in the replace_all algorithm + template< + typename StorageT, + typename InputT, + typename ForwardIteratorT > + inline ForwardIteratorT process_segment( + StorageT& Storage, + InputT& Input, + ForwardIteratorT InsertIt, + ForwardIteratorT SegmentBegin, + ForwardIteratorT SegmentEnd ) + { + return + process_segment_helper< + has_stable_iterators<InputT>::value>()( + Storage, Input, InsertIt, SegmentBegin, SegmentEnd ); + } + + + } // namespace detail + } // namespace algorithm +} // namespace boost + +#endif // BOOST_STRING_REPLACE_STORAGE_DETAIL_HPP |