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alee-forth/alee-standalone.cpp

161 lines
4.0 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/>.
*/
#include "alee.hpp"
#include "splitmemdict.hpp"
#include <charconv>
#include <fstream>
#include <iostream>
#include <vector>
alignas(sizeof(Cell))
#include "core.fth.h"
static bool okay = false;
static void readchar(State& state);
static void parseLine(State&, const std::string&);
static void parseFile(State&, std::istream&);
int main(int argc, char *argv[])
{
SplitMemDict<alee_dat_len> dict (alee_dat);
State state (dict, readchar);
std::vector args (argv + 1, argv + argc);
for (const auto& a : args) {
std::ifstream file (a);
parseFile(state, file);
}
okay = true;
parseFile(state, std::cin);
return 0;
}
static void readchar(State& state)
{
Addr idx = state.dict.read(Dictionary::Input);
Addr addr = Dictionary::Input + sizeof(Cell) + idx;
auto c = static_cast<char>(std::cin.get());
if (isupper(c))
c += 32;
state.dict.writebyte(addr, c ? c : ' ');
}
static void save(State& state)
{
std::ofstream file ("alee.dat", std::ios::binary);
if (file.good()) {
for (Addr i = 0; i < state.dict.here(); ++i)
file.put(state.dict.readbyte(i));
}
}
static void load(State& state)
{
std::ifstream file ("alee.dat", std::ios::binary);
Addr i = 0;
while (file.good())
state.dict.writebyte(i++, file.get() & 0xFFu);
}
void user_sys(State& state)
{
char buf[32] = {0};
switch (state.pop()) {
case 0: // .
std::to_chars(buf, buf + sizeof(buf), state.pop(),
state.dict.read(Dictionary::Base));
std::cout << buf << ' ';
break;
case 1: // u.
{
Addr ucell = static_cast<Addr>(state.pop());
std::to_chars(buf, buf + sizeof(buf), ucell,
state.dict.read(Dictionary::Base));
std::cout << buf << ' ';
}
break;
case 2: // emit
std::cout << static_cast<char>(state.pop());
break;
case 3: // save
save(state);
break;
case 4: // load
load(state);
break;
default:
break;
}
}
void parseLine(State& state, const std::string& line)
{
if (auto r = Parser::parse(state, line.c_str()); r == Error::none) {
if (okay)
std::cout << (state.compiling() ? " compiled" : " ok") << std::endl;
} else {
switch (r) {
case Error::noword:
std::cout << "word not found in: " << line << std::endl;
break;
case Error::push:
std::cout << "stack overflow" << std::endl;
break;
case Error::pushr:
std::cout << "return stack overflow" << std::endl;
break;
case Error::popr:
std::cout << "return stack underflow" << std::endl;
break;
case Error::pop:
case Error::top:
case Error::pick:
std::cout << "stack underflow" << std::endl;
break;
default:
std::cout << "unknown error" << std::endl;
break;
}
state.reset();
}
}
void parseFile(State& state, std::istream& file)
{
while (file.good()) {
std::string line;
std::getline(file, line);
if (line == "bye")
exit(0);
parseLine(state, line);
}
}