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main.cpp
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main.cpp
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#include "FwdTypes.hpp"
#include "lexer/Loxer.h"
#include "parser/Loxgram.h"
#include "visitor/Interpreter.hpp"
#include "visitor/Resolver.hpp"
#include "visitor/ASTPrinter.hpp"
#include "Environment.hpp"
#include <vector>
#include <functional>
#include <fstream>
#define VER_STR "1.02 (2024-Jan-06)"
#ifdef _MSC_VER
#define OPTION_SWITCH '/'
#define USE_STR "[/?|/h|/v] [/i [/a]|/b] [filename]"
#else
#define OPTION_SWITCH '-'
#define USE_STR "[-?|-h|-v] [-i [-a]|-b] [filename]"
#endif
enum class ReturnCode { Unset = -1, Success = 0, Informational, OptionsError, BadFile, ParseError, RuntimeError };
enum class RuntimeOptions { None = 0, ShowAST = 1, Batch = 2, Interactive = 4, JIT = 8 };
RuntimeOptions operator | (RuntimeOptions lhs, RuntimeOptions rhs) {
return static_cast<RuntimeOptions>(static_cast<std::underlying_type_t<RuntimeOptions>>(lhs)
| static_cast<std::underlying_type_t<RuntimeOptions>>(rhs));
}
RuntimeOptions operator & (RuntimeOptions lhs, RuntimeOptions rhs) {
return static_cast<RuntimeOptions>(static_cast<std::underlying_type_t<RuntimeOptions>>(lhs)
& static_cast<std::underlying_type_t<RuntimeOptions>>(rhs));
}
int main(const int argc, const char **argv) {
auto returnCode = ReturnCode::Unset;
std::ifstream input{};
RuntimeOptions opts = RuntimeOptions::None;
int arg = 0;
while (++arg < argc) {
if (argv[arg][0] == OPTION_SWITCH) {
switch(argv[arg][1]) {
case 'a':
opts = opts | RuntimeOptions::ShowAST;
break;
case 'b':
opts = opts | RuntimeOptions::Batch;
break;
case 'i':
opts = opts | RuntimeOptions::Interactive;
break;
case 'j':
opts = opts | RuntimeOptions::JIT;
break;
case 'h':
case '?':
std::cerr << "Usage: " << argv[0] << ' ' << USE_STR << '\n';
returnCode = ReturnCode::Informational;
break;
case 'v':
std::cerr << VER_STR << '\n';
returnCode = ReturnCode::Informational;
break;
default:
std::cerr << "Unrecognized option \'" << OPTION_SWITCH << argv[arg][1] << "\'\n";
returnCode = ReturnCode::OptionsError;
break;
}
}
else {
break;
}
}
if (returnCode != ReturnCode::Informational) {
if ((opts & (RuntimeOptions::Batch | RuntimeOptions::Interactive))
== (RuntimeOptions::Batch | RuntimeOptions::Interactive)) {
std::cerr << "Error: Only specify one of -b and -i\n";
returnCode = ReturnCode::OptionsError;
}
if (((opts & RuntimeOptions::ShowAST) != RuntimeOptions::None)
&& ((opts & RuntimeOptions::Interactive) == RuntimeOptions::None)) {
std::cerr << "Error: Use of -a needs use of -i\n";
returnCode = ReturnCode::OptionsError;
}
if ((opts & RuntimeOptions::JIT) != RuntimeOptions::None) {
std::cerr << "Error: JIT engine not yet implemented\n";
returnCode = ReturnCode::OptionsError;
}
}
if ((opts & (RuntimeOptions::Batch | RuntimeOptions::Interactive))
== RuntimeOptions::None) {
opts = opts | RuntimeOptions::Batch;
}
if (arg != argc) {
if ((opts & RuntimeOptions::Interactive) != RuntimeOptions::Interactive) {
if (arg == (argc - 1)) {
input.open(argv[arg]);
if (!input.is_open()) {
std::cerr << "Error: Could not open file \'" << argv[arg] << "\'\n";
returnCode = ReturnCode::BadFile;
}
}
else {
std::cerr << "Error: Only one input file can be specified\n";
returnCode = ReturnCode::OptionsError;
}
}
else {
std::cerr << "Error: Cannot specify input file with " << OPTION_SWITCH << "i\n";
returnCode = ReturnCode::OptionsError;
}
}
if (returnCode != ReturnCode::Unset) {
return static_cast<int>(returnCode);
}
auto environment = Environment::makeShared();
Interpreter interpreter{ environment };
Resolver resolver{ interpreter };
std::function<void(std::shared_ptr<Stmt>)> execute;
std::vector<std::shared_ptr<Stmt>> program;
if ((opts & RuntimeOptions::Batch) != RuntimeOptions::None) {
execute = [&](std::shared_ptr<Stmt> statement){
program.push_back(statement);
};
}
else {
execute = [&](std::shared_ptr<Stmt> statement){
statement->accept(resolver);
statement->accept(interpreter);
if ((std::dynamic_pointer_cast<StmtExpression>(statement)
|| std::dynamic_pointer_cast<StmtVariable>(statement))) {
if ((opts & RuntimeOptions::ShowAST) == RuntimeOptions::None) {
if (const Value& result = interpreter.lastValue();
static_cast<ValueType>(result.index()) != ValueType::Nil) {
std::cout << "=> " << toString(result) << '\n';
}
}
else {
std::shared_ptr<Expr> expression;
if (std::dynamic_pointer_cast<StmtExpression>(statement)) {
expression = std::dynamic_pointer_cast<StmtExpression>(statement)->get();
}
else {
expression = std::dynamic_pointer_cast<StmtVariable>(statement)->getInit();
}
std::cout << "=> " << toString(interpreter.lastValue())
<< ' ' << toString(expression->accept(ASTPrinter{})) << '\n';
}
}
};
}
Loxer scanner{ input.is_open() ? input : std::cin };
Loxgram parser{ scanner, &execute };
if ((opts & RuntimeOptions::Batch) == RuntimeOptions::None) {
while (returnCode != ReturnCode::Success) {
try {
returnCode = parser.parse() ? ReturnCode::ParseError : ReturnCode::Success;
}
catch (std::exception &e) {
std::cerr << e.what() << '\n';
returnCode = ReturnCode::RuntimeError;
}
}
}
else {
try {
returnCode = parser.parse() ? ReturnCode::ParseError : ReturnCode::Success;
if (returnCode != ReturnCode::ParseError) {
for (auto statement : program) {
statement->accept(resolver);
statement->accept(interpreter);
}
}
}
catch (std::exception &e) {
std::cerr << e.what() << '\n';
returnCode = ReturnCode::RuntimeError;
}
}
return static_cast<int>(returnCode);
}