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from abc import ABC, abstractmethod
import re
class ValidationError(Exception):
pass
class Validator(ABC):
@staticmethod
@abstractmethod
def validate(value, field_object):
pass
class ValidateNull(Validator):
@staticmethod
def validate(value, field_object):
if value is None and not field_object.nullable:
raise ValidationError('Value cannot be NULL')
class ValidateType(Validator):
@staticmethod
def validate(value, field_object):
if field_object.nullable and value is None:
return
if not isinstance(value, field_object.data_type):
raise ValidationError('Value is of wrong type')
class ValidateLength(Validator):
@staticmethod
def validate(value, field_object):
if len(str(value)) > field_object.max_length:
raise ValidationError('Value has too many digits')
class ValidateTime(Validator):
@staticmethod
def validate(value, field_object):
match = re.fullmatch(r'(\d\d):(\d\d):(\d\d)', value)
if not match:
raise ValidationError('Wrong time format')
else:
hour, minute, second = map(int, match.groups())
if hour not in range(0, 24):
raise ValidationError('Wrong hour value')
if minute not in range(0, 60):
raise ValidationError('Wrong minute value')
if second not in range(0, 60):
raise ValidationError('Wrong second value')
class ValidateDate(Validator):
@staticmethod
def validate(value, field_object):
match = re.fullmatch(r'(\d\d\d\d)-(\d\d)-(\d\d)', value)
if not match:
raise ValidationError('Wrong date format')
else:
year, month, day = map(int, match.groups())
if year < 0:
raise ValidationError('Wrong year value')
if month not in range(1, 12):
raise ValidationError('Wrong month value')
if month == 2:
if year % 4 == 0 and year % 100 != 0 or year % 400 == 0:
febr_range = range(1, 29)
else:
febr_range = range(1, 28)
if day not in febr_range:
raise ValidationError('Wrong day value')
else:
days_count = {
1: 31, 3: 31, 4: 30, 5: 31,
6: 30, 7: 31, 8: 31, 9: 30,
10: 31, 11: 30, 12: 31
}.get(month)
if day not in range(1, days_count):
raise ValidationError('Wrong day value')
class ValidateDatetime(Validator):
@staticmethod
def validate(value, field_object):
datetime = value.split()
if len(datetime) != 2:
raise ValidationError('Wrong datetime format')
else:
ValidateDate.validate(datetime[0], {})
ValidateTime.validate(datetime[1], {})
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