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/**
* forspll - LLVM-based Forsp compiler
* Copyright (C) 2024 Clyne Sullivan <clyne@bitgloo.com>
*
* This program is free software: you can redistribute it and/or modify it
* under the terms of the GNU 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 General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License along with
* this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <algorithm>
#include <cctype>
#include <iostream>
#include <list>
#include <map>
#include <string>
#include <string_view>
#include <tuple>
#include "ast.hpp"
#include "llvm.hpp"
#include "parser.hpp"
#include "var.hpp"
static LLVMState llvmState;
std::list<ThunkAST> scope;
static bool parseString(std::string_view sv);
int main()
{
Var::pushScope();
std::string line;
for (unsigned lineno = 1; std::cin.good(); ++lineno) {
std::getline(std::cin, line);
if (!parseString(line)) {
std::cerr << " at line " << lineno << std::endl;
return -1;
}
}
llvmState.output();
std::cout << std::endl;
}
bool parseString(std::string_view sv)
{
do {
const auto [nsv, tok] = nextToken(sv);
if (tok == Token::none && !nsv.empty()) {
std::cerr << "error: unknown term: " << nsv << std::endl;
return false;
} else {
std::unique_ptr<BaseAST> expr;
switch (tok) {
case Token::ThunkOpen:
if (scope.empty())
scope.emplace_back(llvmState, "main");
else
scope.emplace_back(llvmState);
Var::pushScope();
break;
case Token::ThunkClose:
{
auto& thunk = scope.back();
auto gen = thunk.codegen(llvmState);
if (!gen)
return false;
Var::popScope();
Var::addLocal(thunk.name, Var {gen, true});
expr.reset(new PushAST {thunk.name});
scope.pop_back();
}
break;
case Token::Quote:
std::cerr << "error: quoting is not supported!" << std::endl;
return false;
case Token::PopVar:
expr.reset(new PopAST {name});
break;
case Token::PushVar:
expr.reset(new PushAST {name});
break;
case Token::Var:
expr.reset(new CallAST {name});
break;
case Token::Number:
expr.reset(new NumberAST {name});
break;
case Token::none:
break;
}
if (expr) {
if (!scope.empty()) {
if (!expr->codegen(llvmState))
return false;
} else if (tok != Token::ThunkClose) {
std::cerr << "error: non-thunk at top level!" << std::endl;
return false;
}
}
}
sv = nsv;
} while (!sv.empty());
return true;
}
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