add argparse

src/main.cpp

@@ -1,26 +1,55 @@
 #include <iostream>
+#include <fstream>
+#include <string>
 
-#include "antlr4-runtime.h"
 #include "SysyLexer.h"
 #include "SysyParser.h"
+#include "antlr4-runtime.h"
+#include <argparse.hpp>
 
 using namespace antlrSysY;
 using namespace antlr4;
 
-int main(int , const char **) {
-  ANTLRInputStream input(u8"🍴 = 🍐 + \"😎\";(((x * π))) * µ + ∰; a + (x * (y ? 0 : 1) + z);");
+int main(int argc, const char **argv) {
+#pragma region ArgParse
+  argparse::ArgumentParser arg_parser("Catfood's SysY Compiler");
+  arg_parser.add_argument("source").help("A single SysY source file");
+  arg_parser.add_argument("-S")
+      .implicit_value(true)
+      .help("Useless but required by the contest")
+      .required();
+  arg_parser.add_argument("-o").help("Output file name").required();
+  arg_parser.add_argument("-O1").implicit_value(true).default_value(false).help(
+      "Performance mode");
+  try {
+    arg_parser.parse_args(argc, argv);
+  } catch (const std::runtime_error &err) {
+    std::cerr << err.what() << std::endl;
+    std::cerr << arg_parser;
+    std::exit(1);
+  }
+  auto source_file = arg_parser.get<std::string>("source");
+  auto output_file = arg_parser.get<std::string>("-o");
+  auto flg_O1 = arg_parser["-O1"] == true;
+  // std::cout << source_file << " " << output_file << " " << flg_O1 << std::endl;
+#pragma endregion
+
+  std::ifstream ifs_source_file(source_file);
+  ANTLRInputStream input(ifs_source_file);
   SysyLexer lexer(&input);
   CommonTokenStream tokens(&lexer);
 
   tokens.fill();
+#if 0
   for (auto token : tokens.getTokens()) {
     std::cout << token->toString() << std::endl;
   }
+#endif
 
   SysyParser parser(&tokens);
   tree::ParseTree *tree = parser.program();
-
+#if 0
   std::cout << tree->toStringTree(&parser) << std::endl << std::endl;
-
+#endif
   return 0;
 }