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65 lines
2.0 KiB
C++
65 lines
2.0 KiB
C++
/*
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* Copyright (C) Nemirtingas
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* This file is part of System.
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*
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* System is free software; you can redistribute it
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* and/or modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 3 of the License, or (at your option) any later version.
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*
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* System is distributed in the hope that it will be
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* useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with System; if not, see
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* <http://www.gnu.org/licenses/>.
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*/
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#pragma once
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#include <cstdint>
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#include <string>
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#include "SystemDetector.h"
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#include "StringView.hpp"
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namespace System {
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namespace StringSwitch {
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#if defined(SYSTEM_ARCH_X86)
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using hash_type = uint32_t;
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#else
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using hash_type = uint64_t;
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#endif
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namespace Detail {
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constexpr char lower_char(char c) { return ((c >= 'A' && c <= 'Z') ? c + 32 : c); }
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}
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// switch case on a string
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constexpr hash_type Hash(const char* input, size_t len) { return (len > 0 ? static_cast<hash_type>(*input) + 33 * Hash(input + 1, len - 1) : 5381); }
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template<size_t N>
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constexpr hash_type Hash(const char(&input)[N]) { return Hash(input, N-1); }
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constexpr hash_type Hash(System::StringView sv) { return Hash(sv.data(), sv.length()); }
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inline hash_type Hash(const std::string& input) { return Hash(input.c_str(), input.length()); }
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constexpr hash_type IHash(const char* input, size_t len) { return (len > 0 ? static_cast<hash_type>(Detail::lower_char(*input)) + 33 * IHash(input + 1, len - 1) : 5381); }
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template<size_t N>
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constexpr inline hash_type IHash(const char(&input)[N]) { return IHash(input, N - 1); }
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constexpr hash_type IHash(System::StringView sv) { return IHash(sv.data(), sv.length()); }
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inline hash_type IHash(const std::string& input) { return IHash(input.c_str(), input.length()); }
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}
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}
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