Implementar função para remover símbolos específicos de uma string de CPF

README.md

@@ -154,14 +154,23 @@ Argumentos:
 
 Retorna:
 
-- str: Uma nova string com os símbolos especificados removidos.
+- str: Uma nova string com os símbolos especificados removidos. Caso o CPF
+fornecido não seja válido, retornará None
 
 Exemplo:
 
 ```python
 >>> from brutils import remove_symbols_cpf
 >>> remove_symbols_cpf('000.111.222-33')
 '00011122233'
+>>> remove_symbols_cpf('000.111.222-3')
+None
+>>> remove_symbols_cpf('000.111.222-333')
+None
+>>> remove_symbols_cpf('')
+None
+>>> remove_symbols_cpf(123)
+None
 ```
 
 ### generate_cpf

README_EN.md

@@ -151,7 +151,8 @@ the '.', '-' characters from it.
 
 Args:
 
-- cpf (str): The CPF string containing symbols to be removed.
+- cpf (str): The CPF string containing symbols to be removed. If the provided
+CPF is invalid, it'll return None.
 
 Returns:
 
@@ -163,6 +164,14 @@ Example:
 >>> from brutils import remove_symbols_cpf
 >>> remove_symbols_cpf('000.111.222-33')
 '00011122233'
+>>> remove_symbols_cpf('000.111.222-3')
+None
+>>> remove_symbols_cpf('000.111.222-333')
+None
+>>> remove_symbols_cpf('')
+None
+>>> remove_symbols_cpf(123)
+None
 ```
 
 ### generate_cpf

brutils/__init__.py

@@ -41,6 +41,9 @@
 from brutils.cpf import (
     remove_symbols as remove_symbols_cpf,
 )
+from brutils.cpf import (
+    remove_symbols_cpf as remove_symbols_from_cpf,
+)
 
 # Email Import
 from brutils.email import is_valid as is_valid_email
@@ -141,6 +144,7 @@
     "generate_cpf",
     "is_valid_cpf",
     "remove_symbols_cpf",
+    "remove_symbols_from_cpf",
     # Email
     "is_valid_email",
     # Legal Process

brutils/cpf.py

@@ -243,3 +243,47 @@ def _checksum(basenum):  # type: (str) -> str
     verifying_digits += str(_hashdigit(basenum + verifying_digits, 11))
 
     return verifying_digits
+
+
+def remove_symbols_cpf(cpf: str) -> str:
+    """
+    Compute the checksum digits for a given CPF base number.
+
+    This function removes the symbols dot and dash (`.` and `-`) from a CPF.
+
+    Args:
+        basenum (str): A formatted CPF string with standard visual aid symbols or None
+        if the input is invalid.
+
+    Returns:
+        str: A numbers-only CPF string. If it's not a valid number or format, it'll return None.
+
+    Example:
+        >>> from brutils import remove_symbols_cpf
+        >>> remove_symbols_cpf('000.111.222-33')
+        '00011122233'
+        >>> remove_symbols_cpf('')
+        None
+        >>>     remove_symbols_cpf(123)
+        None
+        >>> remove_symbols_cpf('000.111.222')
+        None
+        >>> remove_symbols_cpf('000.111.222-333')
+        None
+    """
+
+    cpf_no_symbols = ""
+    if cpf == "":
+        return None
+    elif not isinstance(cpf, str):
+        return None
+    else:
+        for character in cpf:
+            if character not in ".-":
+                cpf_no_symbols += character
+        if len(cpf_no_symbols) < 10:
+            return None
+        elif len(cpf_no_symbols) > 11:
+            return None
+        else:
+            return cpf_no_symbols

tests/test_cpf.py

@@ -9,6 +9,7 @@
     generate,
     is_valid,
     remove_symbols,
+    remove_symbols_cpf,
     sieve,
     validate,
 )
@@ -109,5 +110,23 @@ def test_when_cpf_is_not_valid_returns_none(self, mock_is_valid):
         self.assertIsNone(format_cpf("11144477735"))
 
 
+@patch("brutils.cpf.remove_symbols_cpf")
+class TestRemoveSymbolsCPF(TestCase):
+    def test_remove_symbols_cpf_positive(self, mock_remove_symbols_cpf):
+        self.assertEqual(remove_symbols_cpf("123.456.789-10"), "12345678910")
+
+    def test_remove_symbols_cpf_negative_int(self, mock_remove_symbols_cpf):
+        self.assertIsNone(remove_symbols_cpf(123456789))
+
+    def test_remove_symbols_cpf_negative_empy(self, mock_remove_symbols_cpf):
+        self.assertIsNone(remove_symbols_cpf(""))
+
+    def test_remove_symbols_cpf_negative_longer(self, mock_remove_symbols_cpf):
+        self.assertIsNone(remove_symbols_cpf("111.222.333-444"))
+
+    def test_remove_symbols_cpf_negative_shorter(self, mock_remove_symbols_cpf):
+        self.assertIsNone(remove_symbols_cpf("111.222.333"))
+
+
 if __name__ == "__main__":
     main()