1. import re
  3. class FormFieldValidator:
  4. def __init__(self, field_name, field_type, validation_rules, retry_attempts=3):
  5. self.field_name = field_name
  6. self.field_type = field_type # e.g., 'text', 'email', 'number'
  7. self.validation_rules = validation_rules # Dictionary of rules (e.g., {'required': True, 'min_length': 5})
  8. self.retry_attempts = retry_attempts
  10. def validate(self, value):
  11. attempts = 0
  12. while attempts < self.retry_attempts:
  13. try:
  14. if not value:
  15. if self.validation_rules.get('required', False):
  16. raise ValueError(f"{self.field_name} is required.")
  18. if self.field_type == 'email':
  19. if not re.match(r"[^@]+@[^@]+\.[^@]+", value):
  20. raise ValueError(f"{self.field_name} is not a valid email address.")
  22. if self.validation_rules.get('min_length') and len(value) < self.validation_rules['min_length']:
  23. raise ValueError(f"{self.field_name} must be at least {self.validation_rules['min_length']} characters long.")
  25. if self.validation_rules.get('max_length') and len(value) > self.validation_rules['max_length']:
  26. raise ValueError(f"{self.field_name} must be no more than {self.validation_rules['max_length']} characters long.")
  28. # Add more validation rules here as needed
  30. return value # Validation successful
  32. except ValueError as e:
  33. attempts += 1
  34. if attempts < self.retry_attempts:
  35. print(f"Validation failed for {self.field_name}. Attempt {attempts}/{self.retry_attempts}. Retrying...")
  36. else:
  37. raise ValueError(f"Validation failed for {self.field_name} after {self.retry_attempts} attempts: {e}")
  38. raise ValueError(f"Validation failed for {self.field_name} after {self.retry_attempts} attempts.")
  40. if __name__ == '__main__':
  41. # Example Usage
  42. email_validator = FormFieldValidator(
  43. field_name="email",
  44. field_type="email",
  45. validation_rules={'required': True, 'min_length': 5},
  46. retry_attempts=2
  47. )
  49. try:
  50. validated_email = email_validator.validate("test@example.com")
  51. print(f"Valid email: {validated_email}")
  52. except ValueError as e:
  53. print(f"Error: {e}")
  55. try:
  56. validated_email = email_validator.validate("test")
  57. print(f"Valid email: {validated_email}")
  58. except ValueError as e:
  59. print(f"Error: {e}")

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