run function

void run(String source, { required bool isRepl, })

Implementation

void run(String source, {required bool isRepl}) {
  Object? result;
  try {
    final lexer = Lexer(source);
    List<Token> tokens = lexer.scanTokens();

    final parser = Parser(tokens);
    List<Stmt> statements = parser.parse(); // parse() now returns List<Stmt>

    // Stop if there was a syntax error during parsing (indicated by hadError flag)
    // The error message should have been printed by the parser's error handler.
    // Note: Parser exceptions are caught below, this check might be redundant.
    // if (hadError) return; // Let exceptions handle control flow

    // // Optional: Print AST for debugging
    // if (isRepl && !hadError) { // Only print AST if no parse errors
    //   print("--- AST ---");
    //   statements.forEach((stmt) => print(AstPrinter().printStmt(stmt)));
    //   print("-----------");
    // }

    // If parsing was successful, interpret the AST
    result = interpreter.interpret(statements);
    if (result != null) result = interpreter.repr(result);
  } on LexerError catch (e) {
    print(e);
    hadError = true; // Mark static error
  } on ParseError {
    // Error should have been printed by parser's synchronize/error mechanism.
    hadError = true; // Mark static error
  } on RuntimeError {
    // Runtime errors are caught by interpreter.interpret() and printed there.
    hadRuntimeError = true; // Mark runtime error
  } on ReturnValue catch (_) {
    // This should only happen if 'return' is used at the top level (outside any function)
    hadRuntimeError = true; // Treat as runtime error in REPL/script context
  } catch (e, stacktrace) {
    // Catch any other unexpected Dart errors during execution
    print("An unexpected internal error occurred: $e");
    if (isRepl) {
      // Show stacktrace in REPL for debugging the interpreter itself
      print(stacktrace);
    }
    hadError = true; // Treat unexpected errors as critical failures
  }
  if (result != null) {
    print(result.toString());
  }
}