[feature] all() validator

README.md

@@ -426,6 +426,41 @@ Examples:
 - `any(str(min=3, max=3),str(min=5, max=5),str(min=7, max=7))`: validates to a string that is exactly 3, 5, or 7 characters long
 - `any()`: Allows any value.
 
+### All - `all([validators])`
+
+Validates against a conjunction of validators. Use when a value must satisfy **all** of the specified validators. Unlike the `Any` validator which requires just one validator to pass, this validator requires that **every** validator passes for the value to be considered valid.
+* arguments: validators to test values with (at least one should be provided)
+
+The `all()` validator is particularly valuable when combining heterogeneous validators that cannot be easily combined using existing syntax, especially when custom validators are involved.
+
+Examples:
+* `all(str(), regex('^[A-Z][a-z]+$'))`: Validates that the value is both a string and matches the pattern for capitalized words.
+* `all(num(min=0), num(max=100))`: Ensures a number is both non-negative and less than or equal to 100.
+
+Here's a more realistic example with custom validators:
+
+```yaml
+# Schema
+username: all(
+  str(min=3, max=20),                   # Basic string length requirements
+  regex('^[a-zA-Z0-9_]+$'),             # Only alphanumeric and underscore allowed
+  not_blacklisted()                     # Custom validator to check against blacklisted names
+)
+password: all(
+  str(min=8),                           # Minimum length requirement
+  has_uppercase(),                      # Custom validator for at least one uppercase character
+  has_digit(),                          # Custom validator for at least one digit
+  has_special_char()                    # Custom validator for at least one special character
+)
+email: all(
+  str(),                                # Must be a string
+  regex('^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$'), # Basic email format validation
+  email_domain_exists()                 # Custom validator that checks if the domain exists
+)
+```
+
+Where `not_blacklisted()`, `has_uppercase()`, `has_digit()`, `has_special_char()`, and `email_domain_exists()` would be custom validators you define for your specific requirements.
+
 ### Subset - `subset([validators], allow_empty=False)`
 Validates against a subset of types. Unlike the `Any` validator, this validators allows **one or more** of several types.
 As such, it *automatically validates against a list*. It is valid if all values can be validated against at least one

yamale/schema/schema.py

@@ -106,6 +106,9 @@ def _validate(self, validator, data, path, strict):
         elif isinstance(validator, val.Any):
             errors += self._validate_any(validator, data, path, strict)
 
+        elif isinstance(validator, val.All):
+            errors += self._validate_all(validator, data, path, strict)
+
         elif isinstance(validator, val.Subset):
             errors += self._validate_subset(validator, data, path, strict)
 
@@ -177,6 +180,19 @@ def _validate_any(self, validator, data, path, strict):
 
         return errors
 
+    def _validate_all(self, validator, data, path, strict):
+        if not validator.validators:
+            return []
+
+        errors = []
+        # With 'all', every validator must succeed
+        for v in validator.validators:
+            err = self._validate(v, data, path, strict)
+            if err:
+                errors += err
+
+        return errors
+
     def _validate_subset(self, validator, data, path, strict):
         def _internal_validate(internal_data):
             sub_errors = []

yamale/syntax/parser.py

@@ -25,7 +25,7 @@ def _validate_expr(call_node, validators):
         elif isinstance(base_arg, ast.Call):
             _validate_expr(base_arg, validators)
         else:
-            raise SyntaxError("Argument values must either be constant literals, or else " "reference other validators.")
+            raise SyntaxError("Argument values must either be constant literals, or else reference other validators.")
 
 
 def parse(validator_string, validators=None):

yamale/tests/fixtures/all.yaml

@@ -0,0 +1,6 @@
+number_range: all(num(min=5), num(max=10))
+password: all(str(min=8), regex('^(?=.*[a-z])(?=.*[A-Z])(?=.*\d).*$'))
+email: all(str(), regex('^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$'))
+mixed_list: list(all(num(min=0), num(max=100)))
+nested:
+  value: all(int(min=10), int(max=20))

yamale/tests/fixtures/all_bad.yaml

@@ -0,0 +1,9 @@
+number_range: 12  # Over max limit
+password: "pass"  # Too short and missing required characters
+email: "invalid-email"  # Not a valid email format
+mixed_list:
+  - 42
+  - 150  # Over max limit
+  - 15
+nested:
+  value: 5  # Under min limit

yamale/tests/fixtures/all_good.yaml

@@ -0,0 +1,9 @@
+number_range: 7
+password: "Password123"
+email: "test@example.com"
+mixed_list:
+  - 42
+  - 78
+  - 15
+nested:
+  value: 15

yamale/tests/test_functional.py

@@ -40,6 +40,7 @@
 
 semver = {"schema": "semver_schema.yaml", "good": "semver_good.yaml", "bad": "semver_bad.yaml"}
 
+alls = {"schema": "all.yaml", "good": "all_good.yaml", "bad": "all_bad.yaml"}
 
 include_validator = {
     "schema": "include_validator.yaml",
@@ -117,6 +118,7 @@
     map_key_constraint,
     numeric_bool_coercion,
     semver,
+    alls,
     subset,
     subset_empty,
 ]
@@ -205,6 +207,10 @@ def test_bad_semver():
     assert count_exception_lines(semver["schema"], semver["bad"]) == 1
 
 
+def test_bad_all():
+    assert count_exception_lines(alls["schema"], alls["bad"]) == 6
+
+
 def test_bad_regexes():
     assert count_exception_lines(regexes["schema"], regexes["bad"]) == 4
 

yamale/validators/tests/test_validate.py

@@ -224,3 +224,25 @@ def test_semver():
     assert not v.is_valid("+justmeta")
     assert not v.is_valid("9.8.7+meta+meta")
     assert not v.is_valid("9.8.7-whatever+meta+meta")
+
+
+def test_all():
+    """Test the All validator"""
+    # Test with numeric validators
+    v = val.All(val.Number(min=5), val.Number(max=10))
+    assert v.is_valid(7)  # Should pass both validators
+    assert not v.is_valid(4)  # Fails min=5
+    assert not v.is_valid(11)  # Fails max=10
+
+    # Test with string validators
+    v = val.All(val.String(min=2), val.String(max=5))
+    assert v.is_valid("abc")  # Passes both
+    assert not v.is_valid("a")  # Fails min=2
+    assert not v.is_valid("abcdef")  # Fails max=5
+
+    # Test with mixed validators
+    v = val.All(val.String(), val.Regex(r"^[a-z]+$"))
+    assert v.is_valid("abc")  # String that matches regex
+    assert not v.is_valid(123)  # Not a string
+    assert not v.is_valid("123")  # String but fails regex
+    assert not v.is_valid("abc123")  # String but fails regex

yamale/validators/validators.py

@@ -157,6 +157,48 @@ def _is_valid(self, value):
         return True
 
 
+class All(Validator):
+    """All validators must succeed validator"""
+
+    tag = "all"
+
+    def __init__(self, *args, **kwargs):
+        self.validators = [val for val in args if isinstance(val, Validator)]
+        super(All, self).__init__(*args, **kwargs)
+
+    def _is_valid(self, value):
+        return True
+
+    def validate(self, value):
+        """
+        Override to validate against all validators.
+        Returns a list of all errors from all validators.
+        """
+        # First check base validator conditions
+        errors = []
+
+        # Make sure the type validates first
+        valid = self._is_valid(value)
+        if not valid:
+            errors.append(self.fail(value))
+            return errors
+
+        # Then validate all the constraints
+        for constraint in self._constraints_inst:
+            error = constraint.is_valid(value)
+            if error:
+                if isinstance(error, list):
+                    errors.extend(error)
+                else:
+                    errors.append(error)
+
+        # Now validate against all child validators
+        for validator in self.validators:
+            errors.extend(validator.validate(value))
+
+        return errors
+
+
 class Subset(Validator):
     """Subset of several types validator"""