string library

String validation rules for the Formix ecosystem.

Use this import for selective access to string validators only.

import 'package:formix_validators/string.dart';

final validator = StringRules.email(error: 'Invalid email');

Classes

AllOf<T, E>

Validates that ALL rules pass (AND logic).

AllOfCollect<T, E>

Validates that ALL rules pass, collecting all errors.

AllOfCollectLimited<T, E>

Validates that ALL rules pass, collecting errors up to a maximum limit.

AndThen<T, E>

Chains two validators, running the second only if the first passes.

AnyOf<T, E>

Validates that AT LEAST ONE rule passes (OR logic).

AnyOfCollect<T, E>

Validates that AT LEAST ONE rule passes, collecting all errors on failure.

CachedFormix<T, E>

A validator wrapper that caches the last validation result.

Chain<T, E>

Chains validators sequentially, only proceeding if the previous passes.

ConditionalLazyFormix<T, E>

A validator that conditionally creates itself based on a condition.

ErrorMessageFormatter<E>

Formats validation errors into user-facing messages.

Formix<T, E>

The root abstraction for all validators in the Formix ecosystem.

FunctionRule<T, E>

A rule defined by a validation function.

Invalid<T, E>

Represents a failed validation with a single error.

InvalidAll<T, E>

Represents a failed validation with multiple errors.

LazyFormix<T, E>

A validator that defers instantiation until first use.

LruCachedFormix<T, E>

A validator wrapper that caches multiple validation results using LRU eviction.

MapError<T, EIn, EOut>

Maps a validator's error type.

MapValue<TIn, TOut, E>

Maps a validator's output value.

Optional<T, E>

Wraps a validator to make it optional - skips validation when empty.

OptionalNullable<T, E>

Wraps a validator for nullable types - skips validation when null.

PredicateRule<T, E>

A rule defined by a predicate function.

Recover<T, E>

Recovers from validation errors with a default value.

Rule<T, E>

A single validation rule.

StringRules

Factory class for creating string validation rules.

Tap<T, E>

Applies side effects without affecting validation.

Transform<TIn, TOut, E>

Transforms a value before validation.

Valid<T, E>

Represents a successful validation.

Validate

Static factory class for creating validators.

ValidationResult<T, E>

Immutable result of a validation operation.

When<T, E>

Conditionally applies validation based on a predicate.

WhenElse<T, E>

Conditionally applies one of two validators based on a predicate.

WhenNot<T, E>

Inverse of When - validates only when condition is false.

Extensions

FormixExtensions on Formix<T, E>

Extension methods for Formix that provide ergonomic composition.