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alee-forth/dictionary.hpp

61 lines
1.8 KiB
C++

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