Feat: custom validators

.gitignore

@@ -5,4 +5,6 @@
 pubspec.lock
 
 .fvm/
-.fvmrc
+.fvmrc
+
+.nvim.lua

packages/luthor/lib/src/validations/any_validation.dart

@@ -1,11 +1,7 @@
 import 'package:luthor/src/validation.dart';
 
 class AnyValidation extends Validation {
-  String? customMessage;
-
-  AnyValidation({
-    String? message,
-  }) : customMessage = message;
+  AnyValidation();
 
   @override
   bool call(String? fieldName, Object? value) {

packages/luthor/lib/src/validations/custom_validation.dart

@@ -0,0 +1,35 @@
+import 'package:luthor/src/validation.dart';
+
+typedef CustomValidator = bool Function(Object? value);
+
+class CustomValidation extends Validation {
+  String? customMessage;
+  final CustomValidator customValidator;
+
+  CustomValidation(
+    this.customValidator, {
+    String? message,
+  }) : customMessage = message;
+
+  @override
+  bool call(String? fieldName, Object? value) {
+    super.call(fieldName, value);
+    try {
+      return customValidator(value);
+    } catch (e, s) {
+      // ignore: avoid_print
+      print(e);
+      // ignore: avoid_print
+      print(s);
+      return false;
+    }
+  }
+
+  @override
+  String get message =>
+      customMessage ??
+      '${fieldName ?? 'value'} does not pass custom validation';
+
+  @override
+  Map<String, List<String>>? get errors => null;
+}

packages/luthor/lib/src/validator.dart

@@ -2,6 +2,7 @@ import 'package:luthor/src/validation.dart';
 import 'package:luthor/src/validation_result.dart';
 import 'package:luthor/src/validations/any_validation.dart';
 import 'package:luthor/src/validations/bool_validation.dart';
+import 'package:luthor/src/validations/custom_validation.dart';
 import 'package:luthor/src/validations/double_validation.dart';
 import 'package:luthor/src/validations/int_validation.dart';
 import 'package:luthor/src/validations/list_validation.dart';
@@ -25,8 +26,14 @@ class Validator {
   final List<Validation> validations;
 
   /// Validates a value as dynamic. Always returns true.
-  Validator any({String? message}) {
-    validations.add(AnyValidation(message: message));
+  Validator custom(CustomValidator customValidator, {String? message}) {
+    validations.add(CustomValidation(customValidator, message: message));
+    return this;
+  }
+
+  /// Validates a value as dynamic. Always returns true.
+  Validator any() {
+    validations.add(AnyValidation());
     return this;
   }
 

packages/luthor/test/validations/custom_validation_test.dart

@@ -0,0 +1,43 @@
+import 'package:luthor/luthor.dart';
+import 'package:test/test.dart';
+
+void main() {
+  test('should return true when custom validator passes', () {
+    final result = l.custom((value) {
+      return value! as bool;
+    }).validateValue(true);
+
+    switch (result) {
+      case SingleValidationSuccess(data: _):
+        expect(result.data, true);
+      case SingleValidationError(data: _, errors: _):
+        fail('should not have errors');
+    }
+  });
+
+  test('should return false when custom validator fails', () {
+    final result = l.custom((value) {
+      return !(value! as bool);
+    }).validateValue(true);
+
+    switch (result) {
+      case SingleValidationSuccess(data: _):
+        fail('should not be a success');
+      case SingleValidationError(data: _, errors: final errors):
+        expect(errors, ['value does not pass custom validation']);
+    }
+  });
+
+  test('should return false if the value is null with required()', () {
+    final result = l.required().custom((value) {
+      return true;
+    }).validateValue(null);
+
+    switch (result) {
+      case SingleValidationSuccess(data: _):
+        fail('should not be a success');
+      case SingleValidationError(data: _, errors: final errors):
+        expect(errors, ['value is required']);
+    }
+  });
+}

packages/luthor_annotation/lib/luthor_annotation.dart

@@ -1,8 +1,9 @@
 export './src/luthor.dart';
+export './src/validators/custom.dart';
 export './src/validators/date_time.dart';
 export './src/validators/email.dart';
 export './src/validators/length.dart';
 export './src/validators/max.dart';
 export './src/validators/min.dart';
-export './src/validators/uri.dart';
 export './src/validators/regex.dart';
+export './src/validators/uri.dart';

packages/luthor_annotation/lib/src/validators/custom.dart

@@ -0,0 +1,6 @@
+class WithCustomValidator {
+  final String? message;
+  final bool Function(Object? value) customValidator;
+
+  const WithCustomValidator(this.customValidator, {this.message});
+}

packages/luthor_generator/example/lib/sample.dart

@@ -9,6 +9,10 @@ part 'sample.freezed.dart';
 
 part 'sample.g.dart';
 
+bool customValidatorFn(Object? value) {
+  return value == 'custom';
+}
+
 @luthor
 @freezed
 class Sample with _$Sample {
@@ -35,6 +39,7 @@ class Sample with _$Sample {
     required String luthorPath,
     required AnotherSample anotherSample,
     @JsonKey(name: 'jsonKeyName') required String foo,
+    @WithCustomValidator(customValidatorFn) required String custom,
   }) = _Sample;
 
   static SchemaValidationResult<Sample> validate(Map<String, dynamic> json) =>
@@ -61,6 +66,7 @@ void main() {
     "minAndMaxInt": 1,
     "minAndMaxDouble": 1.0,
     "minAndMaxNumber": 1,
+    "custom": 'custom',
   });
   switch (result2) {
     case SchemaValidationError(errors: final errors):
@@ -78,6 +84,7 @@ void main() {
     "minAndMaxInt": 5,
     "minAndMaxDouble": 5.0,
     "minAndMaxNumber": 5,
+    "custom": 1,
   });
   switch (result3) {
     case SchemaValidationError(errors: final errors):

packages/luthor_generator/example/lib/sample.freezed.dart

@@ -55,6 +55,8 @@ mixin _$Sample {
   AnotherSample get anotherSample => throw _privateConstructorUsedError;
   @JsonKey(name: 'jsonKeyName')
   String get foo => throw _privateConstructorUsedError;
+  @WithCustomValidator(customValidatorFn)
+  String get custom => throw _privateConstructorUsedError;
 
   Map<String, dynamic> toJson() => throw _privateConstructorUsedError;
   @JsonKey(ignore: true)
@@ -85,7 +87,8 @@ abstract class $SampleCopyWith<$Res> {
       @IsUri(allowedSchemes: ['https']) String? httpsLink,
       @MatchRegex(r'^https:\/\/pub\.dev\/packages\/luthor') String luthorPath,
       AnotherSample anotherSample,
-      @JsonKey(name: 'jsonKeyName') String foo});
+      @JsonKey(name: 'jsonKeyName') String foo,
+      @WithCustomValidator(customValidatorFn) String custom});
 
   $AnotherSampleCopyWith<$Res> get anotherSample;
 }
@@ -122,6 +125,7 @@ class _$SampleCopyWithImpl<$Res, $Val extends Sample>
     Object? luthorPath = null,
     Object? anotherSample = null,
     Object? foo = null,
+    Object? custom = null,
   }) {
     return _then(_value.copyWith(
       anyValue: freezed == anyValue
@@ -200,6 +204,10 @@ class _$SampleCopyWithImpl<$Res, $Val extends Sample>
           ? _value.foo
           : foo // ignore: cast_nullable_to_non_nullable
               as String,
+      custom: null == custom
+          ? _value.custom
+          : custom // ignore: cast_nullable_to_non_nullable
+              as String,
     ) as $Val);
   }
 
@@ -238,7 +246,8 @@ abstract class _$$SampleImplCopyWith<$Res> implements $SampleCopyWith<$Res> {
       @IsUri(allowedSchemes: ['https']) String? httpsLink,
       @MatchRegex(r'^https:\/\/pub\.dev\/packages\/luthor') String luthorPath,
       AnotherSample anotherSample,
-      @JsonKey(name: 'jsonKeyName') String foo});
+      @JsonKey(name: 'jsonKeyName') String foo,
+      @WithCustomValidator(customValidatorFn) String custom});
 
   @override
   $AnotherSampleCopyWith<$Res> get anotherSample;
@@ -274,6 +283,7 @@ class __$$SampleImplCopyWithImpl<$Res>
     Object? luthorPath = null,
     Object? anotherSample = null,
     Object? foo = null,
+    Object? custom = null,
   }) {
     return _then(_$SampleImpl(
       anyValue: freezed == anyValue
@@ -352,6 +362,10 @@ class __$$SampleImplCopyWithImpl<$Res>
           ? _value.foo
           : foo // ignore: cast_nullable_to_non_nullable
               as String,
+      custom: null == custom
+          ? _value.custom
+          : custom // ignore: cast_nullable_to_non_nullable
+              as String,
     ));
   }
 }
@@ -379,7 +393,8 @@ class _$SampleImpl implements _Sample {
       @MatchRegex(r'^https:\/\/pub\.dev\/packages\/luthor')
       required this.luthorPath,
       required this.anotherSample,
-      @JsonKey(name: 'jsonKeyName') required this.foo})
+      @JsonKey(name: 'jsonKeyName') required this.foo,
+      @WithCustomValidator(customValidatorFn) required this.custom})
       : _listValue = listValue;
 
   factory _$SampleImpl.fromJson(Map<String, dynamic> json) =>
@@ -445,10 +460,13 @@ class _$SampleImpl implements _Sample {
   @override
   @JsonKey(name: 'jsonKeyName')
   final String foo;
+  @override
+  @WithCustomValidator(customValidatorFn)
+  final String custom;
 
   @override
   String toString() {
-    return 'Sample(anyValue: $anyValue, boolValue: $boolValue, doubleValue: $doubleValue, intValue: $intValue, listValue: $listValue, numValue: $numValue, stringValue: $stringValue, email: $email, date: $date, dateTime: $dateTime, exactly10Characters: $exactly10Characters, minAndMaxString: $minAndMaxString, minAndMaxInt: $minAndMaxInt, minAndMaxDouble: $minAndMaxDouble, minAndMaxNumber: $minAndMaxNumber, httpsLink: $httpsLink, luthorPath: $luthorPath, anotherSample: $anotherSample, foo: $foo)';
+    return 'Sample(anyValue: $anyValue, boolValue: $boolValue, doubleValue: $doubleValue, intValue: $intValue, listValue: $listValue, numValue: $numValue, stringValue: $stringValue, email: $email, date: $date, dateTime: $dateTime, exactly10Characters: $exactly10Characters, minAndMaxString: $minAndMaxString, minAndMaxInt: $minAndMaxInt, minAndMaxDouble: $minAndMaxDouble, minAndMaxNumber: $minAndMaxNumber, httpsLink: $httpsLink, luthorPath: $luthorPath, anotherSample: $anotherSample, foo: $foo, custom: $custom)';
   }
 
   @override
@@ -489,7 +507,8 @@ class _$SampleImpl implements _Sample {
                 other.luthorPath == luthorPath) &&
             (identical(other.anotherSample, anotherSample) ||
                 other.anotherSample == anotherSample) &&
-            (identical(other.foo, foo) || other.foo == foo));
+            (identical(other.foo, foo) || other.foo == foo) &&
+            (identical(other.custom, custom) || other.custom == custom));
   }
 
   @JsonKey(ignore: true)
@@ -514,7 +533,8 @@ class _$SampleImpl implements _Sample {
         httpsLink,
         luthorPath,
         anotherSample,
-        foo
+        foo,
+        custom
       ]);
 
   @JsonKey(ignore: true)
@@ -554,7 +574,9 @@ abstract class _Sample implements Sample {
       @MatchRegex(r'^https:\/\/pub\.dev\/packages\/luthor')
       required final String luthorPath,
       required final AnotherSample anotherSample,
-      @JsonKey(name: 'jsonKeyName') required final String foo}) = _$SampleImpl;
+      @JsonKey(name: 'jsonKeyName') required final String foo,
+      @WithCustomValidator(customValidatorFn)
+      required final String custom}) = _$SampleImpl;
 
   factory _Sample.fromJson(Map<String, dynamic> json) = _$SampleImpl.fromJson;
 
@@ -612,6 +634,9 @@ abstract class _Sample implements Sample {
   @JsonKey(name: 'jsonKeyName')
   String get foo;
   @override
+  @WithCustomValidator(customValidatorFn)
+  String get custom;
+  @override
   @JsonKey(ignore: true)
   _$$SampleImplCopyWith<_$SampleImpl> get copyWith =>
       throw _privateConstructorUsedError;

packages/luthor_generator/lib/checkers.dart

@@ -16,3 +16,4 @@ const hasMaxNumberChecker = TypeChecker.fromRuntime(HasMaxNumber);
 const hasMinNumberChecker = TypeChecker.fromRuntime(HasMinNumber);
 const isUriChecker = TypeChecker.fromRuntime(IsUri);
 const matchRegexChecker = TypeChecker.fromRuntime(MatchRegex);
+const customValidatorChecker = TypeChecker.fromRuntime(WithCustomValidator);

packages/luthor_generator/lib/helpers/validations/base_validations.dart

@@ -4,6 +4,7 @@ import 'package:analyzer/dart/element/nullability_suffix.dart';
 import 'package:analyzer/dart/element/type.dart';
 import 'package:luthor_generator/checkers.dart';
 import 'package:luthor_generator/errors/unsupported_type_error.dart';
+import 'package:luthor_generator/helpers/validations/custom_validations.dart';
 import 'package:luthor_generator/helpers/validations/double_validations.dart';
 import 'package:luthor_generator/helpers/validations/int_validations.dart';
 import 'package:luthor_generator/helpers/validations/number_validations.dart';
@@ -56,6 +57,8 @@ String getValidations(ParameterElement param) {
     _checkAndAddCustomSchema(buffer, param);
   }
 
+  getCustomValidations(param, buffer);
+
   if (param.type is! DynamicType && !isNullable) buffer.write('.required()');
 
   return buffer.toString();

packages/luthor_generator/lib/helpers/validations/custom_validations.dart

@@ -0,0 +1,24 @@
+import 'package:analyzer/dart/element/element.dart';
+import 'package:luthor_generator/checkers.dart';
+import 'package:luthor_generator/helpers/validations/base_validations.dart';
+
+void getCustomValidations(ParameterElement param, StringBuffer buffer) {
+  _checkAndWriteCustomValidation(buffer, param);
+}
+
+void _checkAndWriteCustomValidation(
+  StringBuffer buffer,
+  ParameterElement param,
+) {
+  final customAnnotation = getAnnotation(customValidatorChecker, param);
+  if (customAnnotation != null) {
+    buffer.write('.custom(');
+    final message = customAnnotation.getField('message')?.toStringValue();
+    final customFuntion =
+        customAnnotation.getField('customValidator')!.toFunctionValue()!.name;
+
+    buffer.write(customFuntion);
+    if (message != null) buffer.write(", message: '$message'");
+    buffer.write(')');
+  }
+}