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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.
//
// ==========================================================================
// Helpers for the test_modifier tests.
// ==========================================================================
#ifndef TESTS_MODIFIER_HELPERS_H_
#define TESTS_MODIFIER_HELPERS_H_
#include <functional>
// Cesar Chiffre as a test functor.
template <typename TArgChar, typename TResultChar = TArgChar>
struct CaesarChiffre : public std::function<TResultChar(TArgChar)>
{
TArgChar _delta;
CaesarChiffre() : _delta(0) {}
CaesarChiffre(CaesarChiffre const &other) = default;
CaesarChiffre & operator=(CaesarChiffre const &) = default;
CaesarChiffre(TArgChar delta) {
if (delta < 0)
_delta = ('z' - 'a' + 1) - (-delta) % ('z' - 'a' + 1);
else
_delta = delta;
}
inline TResultChar operator()(TArgChar const & x) const {
if (('a' <= x) && (x <= 'z'))
return (x - 'a' + _delta) % ('z' - 'a' + 1) + 'a';
if (('A' <= x) && (x <= 'Z'))
return (x - 'A' + _delta) % ('Z' - 'A' + 1) + 'A';
return x;
}
};
#endif // TESTS_MODIFIER_HELPERS_H_
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