102 lines
2.2 KiB
C++
102 lines
2.2 KiB
C++
/*
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* SPDX-FileCopyrightText: Dora "cat" <cat@thenight.club>
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* SPDX-License-Identifier: MPL-2.0
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*
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* This Source Code Form is subject to the terms of the Mozilla Public License,
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* v. 2.0. If a copy of the MPL was not distributed with this file, You can
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* obtain one at http://mozilla.org/MPL/2.0/.
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*/
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#ifndef GUARD_VARIADICMACHINE_MACHINE_H
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#define GUARD_VARIADICMACHINE_MACHINE_H
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#include <array>
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#include <cstdarg>
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#include <cstddef>
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#include <cstdint>
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#include <exception>
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#include <iostream>
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namespace VariadicMachine {
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enum Command : int16_t {
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// Single Argument
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NoCommand,
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MoveLeft,
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MoveRight,
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Increment,
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Decrement,
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PrintAsCharacter,
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// Two Arguments
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IncrementBy,
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DecrementBy
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};
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template <std::size_t maxCells = 2048> class VMachine {
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public:
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template <typename... Commands> constexpr void Do(Commands &&...commands) {
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(Execute(commands), ...);
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}
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private:
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Command State = Command::NoCommand;
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std::array<std::int16_t, maxCells> memory;
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std::int16_t W = 0, X = 0, Y = 0, Z = 0;
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std::size_t maxCellLimit = maxCells, currentPosition = 0;
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void Execute(int16_t command) {
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switch (State) {
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case Command::IncrementBy:
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memory[currentPosition] += command;
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State = Command::NoCommand;
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return;
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case Command::DecrementBy:
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memory[currentPosition] -= command;
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State = Command::NoCommand;
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return;
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default:
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std::terminate();
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break;
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case Command::NoCommand:
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break;
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}
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// State: NoCommand
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switch (command) {
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case Command::MoveLeft:
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--currentPosition;
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return;
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case Command::MoveRight:
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++currentPosition;
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return;
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case Command::Increment:
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++memory[currentPosition];
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return;
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case Command::Decrement:
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--memory[currentPosition];
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return;
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case Command::PrintAsCharacter:
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std::wcout << static_cast<wchar_t>(memory[currentPosition]);
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return;
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// Double Argument Commands
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case Command::IncrementBy:
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case Command::DecrementBy:
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State = static_cast<Command>(command);
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return;
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default:
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std::cout << "Here\n";
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std::terminate();
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return;
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}
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}
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};
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} // namespace VariadicMachine
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#endif
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