1. public class TextBlockExecutor {
  3. /**
  4. * Executes a text block synchronously.
  5. *
  6. * @param block The text block to execute. This is treated as a String containing code.
  7. * @return The result of the execution, or null if an error occurred.
  8. */
  9. public static String execute(String block) {
  10. try {
  11. // Use a limited scope to avoid polluting the current class's state
  12. final String finalBlock = block;
  13. return executeInternal(finalBlock);
  14. } catch (Exception e) {
  15. System.err.println("Error executing text block: " + e.getMessage());
  16. e.printStackTrace(); // Consider logging instead of printing to stderr in production
  17. return null;
  18. }
  19. }
  21. private static String executeInternal(String block) throws Exception {
  22. // This is where the actual execution happens.
  23. // In a real-world scenario, you might use a specialized interpreter or VM.
  24. // For demonstration, we'll simply evaluate the string using eval (use with caution!).
  25. // Consider alternatives like BeanShell or a custom interpreter for production.
  26. try {
  27. //Security warning: eval() can be dangerous with untrusted input.
  28. //Best practice is to avoid eval() if possible and use a sandboxed environment.
  29. return new javax.script.ScriptEngineManager().getEngineByName("JavaScript").eval(block).toString();
  31. } catch (Exception e) {
  32. throw e; // Re-throw the exception to be handled by the outer try-catch block
  33. }
  34. }
  35. }

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