dssp9.hpp

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// -----------------------------------------------------------------------------------------------------
// Copyright (c) 2006-2021, Knut Reinert & Freie Universität Berlin
// Copyright (c) 2016-2021, Knut Reinert & MPI für molekulare Genetik
// This file may be used, modified and/or redistributed under the terms of the 3-clause BSD-License
// shipped with this file and also available at: https://github.com/seqan/seqan3/blob/master/LICENSE.md
// -----------------------------------------------------------------------------------------------------
 
#pragma once
 
#include <vector>
 
#include <seqan3/alphabet/concept.hpp>
#include <seqan3/alphabet/alphabet_base.hpp>
#include <seqan3/utility/char_operations/transform.hpp>
 
// ------------------------------------------------------------------
// dssp9
// ------------------------------------------------------------------
 
namespace seqan3
{
 
class dssp9 : public alphabet_base<dssp9, 9>
{
private:
    using base_t = alphabet_base<dssp9, 9>;
 
    friend base_t;
 
public:
    constexpr dssp9()                           noexcept = default; 
    constexpr dssp9(dssp9 const &)              noexcept = default; 
    constexpr dssp9(dssp9 &&)                   noexcept = default; 
    constexpr dssp9 & operator=(dssp9 const &)  noexcept = default; 
    constexpr dssp9 & operator=(dssp9 &&)       noexcept = default; 
    ~dssp9()                                    noexcept = default; 
 
 
private:
    static constexpr char_type rank_to_char_table[alphabet_size]
    {
        'H', 'B', 'E', 'G', 'I', 'T', 'S', 'C', 'X'
    };
 
    static constexpr std::array<rank_type, 256> char_to_rank_table
    {
        [] () constexpr
        {
            std::array<rank_type, 256> ret{};
 
            // initialize with X (std::array::fill unfortunately not constexpr)
            for (rank_type & rnk : ret)
                rnk = 8u;
 
            // reverse mapping for characters
            for (rank_type rnk = 0u; rnk < alphabet_size; ++rnk)
            {
                ret[static_cast<rank_type>(rank_to_char_table[rnk])] = rnk;
            }
 
            return ret;
        } ()
    };
 
    static constexpr char_type rank_to_char(rank_type const rank)
    {
        return rank_to_char_table[rank];
    }
 
    static constexpr rank_type char_to_rank(char_type const chr)
    {
        using index_t = std::make_unsigned_t<char_type>;
        return char_to_rank_table[static_cast<index_t>(chr)];
    }
};
 
inline namespace literals
{
 
constexpr dssp9 operator""_dssp9(char const ch) noexcept
{
    return dssp9{}.assign_char(ch);
}
 
inline std::vector<dssp9> operator""_dssp9(const char * str, std::size_t len)
{
    std::vector<dssp9> vec;
    vec.resize(len);
 
    for (size_t idx = 0u; idx < len; ++idx)
        vec[idx].assign_char(str[idx]);
 
    return vec;
}
 
} // inline namespace literals
 
} // namespace seqan3