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89 lines
2.0 KiB
C++
89 lines
2.0 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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#include "dictionary.hpp"
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Addr Dictionary::allot(Cell amount)
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{
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Addr old = here;
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here += amount;
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return old;
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}
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void Dictionary::add(Cell value)
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{
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write(allot(sizeof(Cell)), value);
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}
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Addr Dictionary::alignhere()
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{
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if (here & (sizeof(Cell) - sizeof(uint8_t)))
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here = (here + sizeof(Cell)) & ~(sizeof(Cell) - sizeof(uint8_t));
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return here;
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}
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void Dictionary::addDefinition(std::string_view str)
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{
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add(str.size());
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for (char c : str)
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add(c);
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}
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bool Dictionary::issame(Addr addr, std::string_view str, std::size_t n)
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{
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if (str.size() != n)
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return false;
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for (char c : str) {
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if (read(addr) != c)
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return false;
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addr += sizeof(Cell);
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}
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return true;
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}
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Addr Dictionary::find(std::string_view str)
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{
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if (latest == 0)
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return 0;
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Addr lt = latest, oldlt;
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do {
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oldlt = lt;
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const auto l = read(lt);
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const auto len = l & 0x1F;
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if (issame(lt + sizeof(Cell), str, len))
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return lt;
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else
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lt -= l >> 6;
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} while (lt != oldlt);
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return 0;
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}
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Addr Dictionary::getexec(Addr addr)
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{
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const auto len = read(addr) & 0x1F;
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return addr + (1 + len) * sizeof(Cell);
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}
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