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95 lines
2.2 KiB
C++
95 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_TYPES_HPP
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#define ALEEFORTH_TYPES_HPP
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#include <cstdint>
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#include <iterator>
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/**
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* Configure the below types for your platform.
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*/
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using Addr = uint16_t;
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using Cell = int16_t;
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using DoubleCell = int32_t;
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using DoubleAddr = uint32_t; // Only used for um/mod.
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struct Dictionary;
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struct State;
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using Func = void (*)(State&);
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enum class Error : int {
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none = 0,
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push,
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pop,
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pushr,
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popr,
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top,
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pick,
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exit,
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noword
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};
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/**
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* Stores the start and past-the-end addresses of a dictionary's word.
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*/
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class Word
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{
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Addr start;
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Addr wend;
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public:
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struct iterator;
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constexpr explicit Word(Addr s = 0, Addr e = 0):
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start(s), wend(e) {}
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static constexpr Word fromLength(Addr s, Addr l) {
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return Word(s, s + l);
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}
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Addr size() const noexcept;
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iterator begin(const Dictionary *);
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iterator end(const Dictionary *);
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struct iterator {
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using iterator_category = std::input_iterator_tag;
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using value_type = uint8_t;
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using pointer = void;
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using reference = void;
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using difference_type = Cell;
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Addr addr;
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const Dictionary *dict;
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constexpr iterator(Addr a, const Dictionary *d):
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addr(a), dict(d) {}
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iterator& operator++();
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iterator operator++(int);
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value_type operator*();
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bool operator!=(const iterator&);
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};
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};
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#endif // ALEEFORTH_TYPES_HPP
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