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vixen.cpp
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vixen.cpp
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#include <format>
#include <fstream>
#include <iostream>
#include "include/vixen.hpp"
using namespace std;
using namespace vixen;
#define VIXEN_NAME "Vixen"
#define VIXEN_VERSION "0.4.2"
struct VixenNamespace {
std::string cinput;
std::string exec;
std::string file;
bool help;
bool version;
};
void usage(VixenNamespace vxn) {
std::cout
<< "usage: " << vxn.exec << " [file?] [OPTIONS]\n"
"Options:\n"
"-c Interperate input.\n"
"-h/--help Print help and exit.\n"
"-V/--version Print exec version."
<< std::endl;
};
template <class... Args>
void print_error(
VixenNamespace vxn,
const std::string& message,
Args&&... args) {
std::cerr
<< vxn.exec << ": error: "
<< std::vformat(message, std::make_format_args(args...))
<< std::endl;
}
template <class... Args>
void panic(
VixenNamespace vxn,
const std::string message,
int exit_code = 1,
bool show_help = false,
Args&& ...args) {
print_error(vxn, message, args...);
if (show_help)
usage(vxn);
exit(exit_code);
}
std::string_view parse_option(
const std::vector<std::string_view>& args,
const std::string_view& option_name) {
for (auto it = args.begin(), end = args.end(); it != end; ++it) {
if (*it == option_name)
if (it + 1 != end)
return *(it + 1);
}
return "";
}
void parse(VixenNamespace& vxn, int argc, const char* argv[]) {
vxn.cinput = std::string();
vxn.exec = std::string(argv[0]);
vxn.file = std::string();
vxn.help = false;
vxn.version = false;
std::vector<std::string_view> args(argv + 1, argv + argc);
std::string short_opts("Vch");
bool skipping = false;
for (const auto& arg : args) {
if (skipping) {
skipping = !skipping;
continue;
}
// Apply our options here before attempting
// to parse positionals. Order of parsing
// doesn't matter, unless we need to exit
// quickly.
if (arg == "-h" || arg == "--help") {
vxn.help = true;
break;
}
if (arg == "-V" || arg == "--version") {
vxn.version = true;
break;
}
if (arg == "-c" || arg == "--cinput") {
vxn.cinput = parse_option(args, arg);
skipping = true;
continue;
}
// If the argument looks like an option
// but we cannot identify it, bail.
if (arg.find('-') >= 0 && arg.find('-') < 2) {
panic(vxn, "Unknown option: '" + std::string(arg) + "'.");
}
// Vixen currently only accepts one
// positional arg, 'file'.
if (!vxn.file.length()) {
vxn.file = arg;
continue;
} else if (vxn.file.length()) {
panic(vxn, "Unknown argument: '" + std::string(arg) + "'.");
}
}
if (vxn.help) {
usage(vxn);
exit(0);
} else if (vxn.version) {
std::cout << VIXEN_NAME " " VIXEN_VERSION << std::endl;
exit(0);
}
if (vxn.file.length() && vxn.cinput.length())
panic(vxn, "Cannot handle more than one input source.");
}
int main(int argc, const char* argv[]) {
tokens::Lexer lexer;
parser::TreeParser parser;
nodes::TreeNode program;
VixenNamespace vxn;
parse(vxn, argc, argv);
if (!vxn.file.length() && !vxn.cinput.length()) {
std::string user_in;
while (1) {
std::cout << ">>> ";
std::getline(std::cin, user_in);
parser = parser::TreeParser(tokens::Lexer(user_in));
std::cout
<< parser::parse(parser)
<< std::endl;
}
} else {
// Interperate code provided from cli or
// from file path.
if (vxn.file.length()) {
ifstream file(vxn.file);
if (!file.is_open())
panic(vxn, "Cannot open file '" + vxn.file + "'.");
lexer = tokens::Lexer(file, vxn.file);
file.close();
} else if (vxn.cinput.length()) {
lexer = tokens::Lexer(vxn.cinput);
}
parser = parser::TreeParser(lexer);
program = parser::parse(parser);
std::cout << program << std::endl;
}
return 0;
}