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/**
* 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>
/**
* Dictionary entry format:
* - 1 information byte
* bits 0..4: Length of name (L)
* bit 5: Immediate?
* bits 6..15: Distance to next entry (negative)
* - L bytes of name
* - 0+ bytes for address alignment
* - 0+ bytes of entry's data...
*/
class Dictionary
{
public:
constexpr static Addr Base = 0;
constexpr static Addr Here = sizeof(Cell);
constexpr static Addr Latest = sizeof(Cell) * 2;
constexpr static Addr Compiling = sizeof(Cell) * 3;
constexpr static Addr Source = sizeof(Cell) * 4;
constexpr static Addr SourceLen = sizeof(Cell) * 5;
constexpr static Addr Input = sizeof(Cell) * 6; // len data...
constexpr static Addr InputCells = 80; // bytes!
constexpr static Addr Begin = sizeof(Cell) * 7 + InputCells;
void initialize();
Addr here() const noexcept { return read(Here); }
void here(Addr l) noexcept { write(Here, l); }
Addr latest() const noexcept { return read(Latest); }
void latest(Addr l) noexcept { write(Latest, l); }
virtual Cell read(Addr) const noexcept = 0;
virtual void write(Addr, Cell) noexcept = 0;
virtual uint8_t readbyte(Addr) const noexcept = 0;
virtual void writebyte(Addr, uint8_t) noexcept = 0;
Addr alignhere() noexcept;
Addr aligned(Addr) const noexcept;
Addr allot(Cell) noexcept;
void add(Cell) noexcept;
void addDefinition(Word) noexcept;
Addr find(Word) noexcept;
Addr getexec(Addr) noexcept;
Word input() noexcept;
bool equal(Word, const char *, unsigned) const noexcept;
bool equal(Word, Word) const noexcept;
};
#endif // ALEEFORTH_DICTIONARY_HPP
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