Esempi in C++ (Cpp) per VM::initRepl

Esempio n. 1

File: main.cpp Progetto: relrod/magpie

int repl(VM& vm)
{
  std::cout << std::endl;
  std::cout << "      _/Oo>" << std::endl;
  std::cout << "     /__/     magpie v0.0.0" << std::endl;
  std::cout << "____//hh___________________" << std::endl;
  std::cout << "   //" << std::endl;
  std::cout << std::endl;
  std::cout << "Type 'Ctrl+C' to exit." << std::endl;

  if (!vm.initRepl())
  {
    std::cerr << "Could not initialize REPL." << std::endl;
    return 1;
  }

  while (true)
  {
    gc<String> code;
    gc<Expr> expr;

    while (true)
    {
      gc<String> line = readLine(!code.isNull());
      if (line.isNull()) return 0;
      
      if (code.isNull())
      {
        code = line;
      }
      else
      {
        code = String::format("%s\n%s", code->cString(), line->cString());
      }

      gc<SourceFile> source = new SourceFile(String::create("<repl>"), code);

      ErrorReporter reporter(true);
      Parser parser(source, reporter);
      expr = parser.parseExpression();

      if (reporter.needMoreLines()) continue;
      if (reporter.numErrors() == 0) break;
      return 3;
    }

    // Evaluate the expression.
    gc<Object> result = vm.evaluateReplExpression(expr);

    // Don't show the result if it's a definition.
    if (expr->asDefExpr() != NULL) continue;
    if (expr->asDefClassExpr() != NULL) continue;

    std::cout << "= " << result << std::endl;
  }
}