added neews validators

CHANGELOG.md

@@ -1,3 +1,7 @@
+## 0.0.2
+
+* Added valid CEP, CNPJ and CreditCard
+
 ## 0.0.1+1
 
 * Initial Release

README.md

@@ -106,6 +106,9 @@ Here’s a complete list of available validators you can use:
 - **isNotNull**: Checks if a value is not null.
 - **isEmpty**: Checks if a string is empty.
 - **validCPF**: Checks if a string is a valid CPF (for use in Brazil).
+- **validCNPJ**: Checks if a string is a valid CNPJ (for use in Brazil).
+- **validCEP**: Checks if a string is a valid CEP (for use in Brazil).
+- **validCredCard**: Checks if a string is a valid Credit Card.
 
 ## Usage with Flutter
 

lib/src/validators/valid_cep_validator.dart

@@ -0,0 +1,20 @@
+part of 'validators.dart';
+
+extension ValidCEPValidator on LucidValidationBuilder<String> {
+  /// Adds a validation rule that checks if the [String] is a valid CEP (Brazilian postal code).
+  ///
+  /// This method verifies that the CEP is in the correct format (#####-###) and consists
+  /// of only numbers.
+  ///
+  /// [message] is the error message returned if the validation fails. Defaults to "Invalid CEP".
+  /// [code] is an optional error code for translation purposes.
+  ///
+  /// Returns the [LucidValidationBuilder] to allow for method chaining.
+  LucidValidationBuilder<String> validCEP({String message = 'Invalid CEP', String code = 'invalid_cep'}) {
+    return registerRule(
+      (value) => RegExp(r'^\d{5}-?\d{3}$').hasMatch(value),
+      message,
+      code,
+    );
+  }
+}

lib/src/validators/valid_cnpj_validator.dart

@@ -0,0 +1,54 @@
+part of 'validators.dart';
+
+extension ValidCNPJValidator on LucidValidationBuilder<String> {
+  /// Adds a validation rule that checks if the [String] is a valid CNPJ number.
+  ///
+  /// The CNPJ is the national identifier for Brazilian companies. This method
+  /// verifies the format and the validity of the CNPJ, ensuring it follows the correct
+  /// algorithm for digit verification.
+  ///
+  /// [message] is the error message returned if the validation fails. Defaults to "Invalid CNPJ".
+  /// [code] is an optional error code for translation purposes.
+  ///
+  /// Returns the [LucidValidationBuilder] to allow for method chaining.
+  LucidValidationBuilder<String> validCNPJ({String message = 'Invalid CNPJ', String code = 'invalid_cnpj'}) {
+    return registerRule(
+      (value) => _validateCNPJ(value),
+      message,
+      code,
+    );
+  }
+
+  bool _validateCNPJ(String cnpj) {
+    // Remove non-numeric characters
+    cnpj = cnpj.replaceAll(RegExp(r'[^0-9]'), '');
+    if (cnpj.length != 14) return false;
+
+    // Check if all digits are the same
+    if (RegExp(r'^(\d)\1*$').hasMatch(cnpj)) return false;
+
+    // Calculate the first check digit
+    int sum = 0;
+    List<int> weight1 = [5, 4, 3, 2, 9, 8, 7, 6, 5, 4, 3, 2];
+    for (int i = 0; i < 12; i++) {
+      sum += int.parse(cnpj[i]) * weight1[i];
+    }
+    int remainder = (sum % 11);
+    int firstCheckDigit = remainder < 2 ? 0 : 11 - remainder;
+
+    // Check the first check digit
+    if (firstCheckDigit != int.parse(cnpj[12])) return false;
+
+    // Calculate the second check digit
+    sum = 0;
+    List<int> weight2 = [6, 5, 4, 3, 2, 9, 8, 7, 6, 5, 4, 3, 2];
+    for (int i = 0; i < 13; i++) {
+      sum += int.parse(cnpj[i]) * weight2[i];
+    }
+    remainder = (sum % 11);
+    int secondCheckDigit = remainder < 2 ? 0 : 11 - remainder;
+
+    // Check the second check digit
+    return secondCheckDigit == int.parse(cnpj[13]);
+  }
+}

lib/src/validators/valid_creditcard_validator.dart

@@ -0,0 +1,45 @@
+part of 'validators.dart';
+
+extension ValidCreditCardValidator on LucidValidationBuilder<String> {
+  /// Adds a validation rule that checks if the [String] is a valid credit card number.
+  ///
+  /// This method uses the Luhn algorithm to verify the validity of a credit card number.
+  /// It checks the length of the number and ensures it passes the Luhn check.
+  ///
+  /// [message] is the error message returned if the validation fails. Defaults to "Invalid credit card number".
+  /// [code] is an optional error code for translation purposes.
+  ///
+  /// Returns the [LucidValidationBuilder] to allow for method chaining.
+  LucidValidationBuilder<String> validCreditCard({String message = 'Invalid credit card number', String code = 'invalid_credit_card'}) {
+    return registerRule(
+      (value) => _validateCreditCard(value),
+      message,
+      code,
+    );
+  }
+
+  bool _validateCreditCard(String number) {
+    // Remove non-numeric characters
+    number = number.replaceAll(RegExp(r'[^0-9]'), '');
+    if (number.isEmpty || number.length < 13 || number.length > 19) return false;
+
+    int sum = 0;
+    bool alternate = false;
+
+    for (int i = number.length - 1; i >= 0; i--) {
+      int n = int.parse(number[i]);
+
+      if (alternate) {
+        n *= 2;
+        if (n > 9) {
+          n -= 9;
+        }
+      }
+
+      sum += n;
+      alternate = !alternate;
+    }
+
+    return (sum % 10 == 0);
+  }
+}

lib/src/validators/validators.dart

@@ -18,5 +18,8 @@ part 'must_have_uppercase.dart';
 part 'not_empty_validator.dart';
 part 'not_equal_validator.dart';
 part 'range_validator.dart';
+part 'valid_cep_validator.dart';
+part 'valid_cnpj_validator.dart';
 part 'valid_cpf.dart';
+part 'valid_creditcard_validator.dart';
 part 'valid_email_validator.dart';

pubspec.yaml

@@ -3,7 +3,7 @@ description: "A Dart/Flutter package for building strongly typed validation rule
 repository: https://github.com/Flutterando/lucid_validation
 homepage: https://pub.dev/documentation/lucid_validation/latest/
 
-version: 0.0.1+1
+version: 0.0.2
 
 environment:
   sdk: ">=3.0.0 <4.0.0"