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66 lines
2.2 KiB
C++
66 lines
2.2 KiB
C++
/**
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* Alee Forth: A portable and concise Forth implementation in modern C++.
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* Copyright (C) 2023 Clyne Sullivan <clyne@bitgloo.com>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU 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 License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#ifndef ALEEFORTH_DICTIONARY_HPP
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#define ALEEFORTH_DICTIONARY_HPP
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#include "types.hpp"
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#include <cstddef>
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#include <cstdint>
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class Dictionary
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{
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public:
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constexpr static Addr Base = 0;
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constexpr static Addr Here = sizeof(Cell);
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constexpr static Addr Latest = sizeof(Cell) * 2;
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constexpr static Addr Compiling = sizeof(Cell) * 3;
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constexpr static Addr Postpone = sizeof(Cell) * 4;
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constexpr static Addr Input = sizeof(Cell) * 5; // len data...
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constexpr static Addr InputCells = 80; // bytes!
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constexpr static Addr Begin = sizeof(Cell) * 6 + InputCells;
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Addr here() const noexcept { return read(Here); }
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void here(Addr l) noexcept { write(Here, l); }
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Addr latest() const noexcept { return read(Latest); }
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void latest(Addr l) noexcept { write(Latest, l); }
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virtual Cell read(Addr) const noexcept = 0;
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virtual void write(Addr, Cell) noexcept = 0;
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virtual uint8_t readbyte(Addr) const noexcept = 0;
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virtual void writebyte(Addr, uint8_t) noexcept = 0;
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Addr alignhere() noexcept;
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Addr aligned(Addr) const noexcept;
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Addr allot(Cell) noexcept;
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void add(Cell) noexcept;
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void addDefinition(Word) noexcept;
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Addr find(Word) noexcept;
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Addr getexec(Addr) noexcept;
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Word input() noexcept;
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bool equal(Word, const char *, unsigned) const noexcept;
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bool equal(Word, Word) const noexcept;
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};
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#endif // ALEEFORTH_DICTIONARY_HPP
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