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// ==========================================================================
// SeqAn - The Library for Sequence Analysis
// ==========================================================================
// Copyright (c) 2006-2026, Knut Reinert, FU Berlin
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
// * Neither the name of Knut Reinert or the FU Berlin nor the names of
// its contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL KNUT REINERT OR THE FU BERLIN BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
// LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
// OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
// DAMAGE.
//
// ==========================================================================
// Author: David Weese <david.weese@fu-berlin.de>
// ==========================================================================
#ifndef SEQAN_HEADER_PIPE_SHIFTER_H
#define SEQAN_HEADER_PIPE_SHIFTER_H
namespace seqan2
{
//namespace seqan2_NAMESPACE_PIPELINING
//{
// template < int delta, bool omitBlank = false, bool _echoing = (delta < 0) >
// struct Shifter;
template < int delta, bool omitBlank = false, bool _echoing = true >
struct Shifter;
/*!
* @class Shifter
*
* @extends Pipe
*
* @headerfile <seqan/pipe.h>
*
* @brief Shifts the input stream by <tt>delta</tt> elements.
*
* @signature template <typename TInput, int DELTA[, bool OMIT_BLANK]>
* class Pipe<TInput, Shifter<DELTA, OMIT_BLANK> >;
*
* @tparam TInput The type of the pipeline module this module reads from.
* @tparam OMIT_BLANK Omit undefined entries. If <tt>true</tt>, the output stream is <tt>|delta|</tt> elements shorter
* than the input stream. If <tt>false</tt>, the lengths are equal and blanks (default constructed
* elements) are inserted on the cut-off-opposite side, defaults to false.
* @tparam DELTA The shift size. For the output stream holds <tt>out[i]=in[i+delta]</tt>. For <tt>delta>0</tt>
* the input stream is cut of at the beginning and for <tt>delta<0</tt> at the end.
*
* The output type equals the input type.
*/
//////////////////////////////////////////////////////////////////////////////
// echoer class
template < typename TInput, int delta, bool omitBlank >
struct Pipe< TInput, Shifter<delta, omitBlank, true> >
{
TInput ∈
typename Size<Pipe>::Type blankCounter, charCounter;
typename Value<Pipe>::Type blank;
Pipe(TInput& _in):
in(_in),
blank() {}
inline typename Value<Pipe>::Type const & operator*() {
if (blankCounter) return blank;
else return *in;
}
inline Pipe& operator++() {
if (blankCounter)
--blankCounter;
else {
++in;
--charCounter;
}
return *this;
}
};
template < typename TInput, int delta, bool omitBlank >
struct Pipe< TInput, Shifter<delta, omitBlank, false> >
{
TInput ∈
typename Size<Pipe>::Type blankCounter, charCounter;
typename Value<Pipe>::Type blank;
Pipe(TInput& _in):
in(_in),
blank() {}
inline typename Value<Pipe>::Type const & operator*() {
if (charCounter) return *in;
else return blank;
}
inline Pipe& operator++() {
if (charCounter) {
++in;
--charCounter;
} else
--blankCounter;
return *this;
}
};
//////////////////////////////////////////////////////////////////////////////
// global pipe functions
template < typename TInput, int delta, bool omitBlank >
inline bool control(Pipe< TInput, Shifter< delta, omitBlank, false > > &me, ControlBeginRead const &command) {
if (!control(me.in, command)) return false;
for(typename Size<TInput>::Type i = 0; i < delta && !eof(me.in); ++i)
++me.in;
me.blankCounter = (omitBlank)? 0: delta;
me.charCounter = length(me.in) - delta;
return !eof(me.in);
}
template < typename TInput, int delta, bool omitBlank >
inline bool control(Pipe< TInput, Shifter< delta, omitBlank, true > > &me, ControlBeginRead const &command) {
if (!control(me.in, command)) return false;
me.blankCounter = (omitBlank)? 0: -delta;
me.charCounter = length(me.in) + delta;
return true;
}
template < typename TInput, int delta, bool _echoing >
inline Size< Pipe< TInput, Shifter< delta, true, _echoing > > >
length(Pipe< TInput, Shifter< delta, true, _echoing > > const &me) {
return length(me.in) - abs(delta);
}
template < typename TInput, int delta, bool omitBlank, bool _echoing >
inline bool control(Pipe< TInput, Shifter< delta, omitBlank, _echoing > > &me, ControlEof const &/*command*/) {
return me.charCounter == 0 && me.blankCounter == 0;
}
template < typename TInput, int delta, bool omitBlank, bool _echoing >
inline bool control(Pipe< TInput, Shifter< delta, omitBlank, _echoing > > &me, ControlEos const &/*command*/) {
return control(me, ControlEof());
}
//}
}
#endif
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