respect-validation/docs/validators/SubdivisionCode.md
Henrique Moody b701fac656
Create ShortCircuit validator and ShortCircuitable interface
This commit introduces a mechanism for validators to return early once
the validation outcome is determined, rather than evaluating all child
validators.

The ShortCircuit validator evaluates validators sequentially and stops
at the first failure, similar to how PHP's && operator works. This is
useful when later validators depend on earlier ones passing, or when
you want only the first error message.

The ShortCircuitCapable interface allows composite validators (AllOf,
AnyOf, OneOf, NoneOf, Each, All) to implement their own short-circuit
logic.

Why "ShortCircuit" instead of "FailFast":

The name "FailFast" was initially considered but proved misleading.
While AllOf stops on failure (fail fast), AnyOf stops on success
(succeed fast), and OneOf stops on the second success. The common
behavior is not about failing quickly, but about returning as soon as
the outcome is determined—which is exactly what short-circuit
evaluation means. This terminology is familiar to developers from
boolean operators (&& and ||), making the behavior immediately
understandable.

Co-authored-by: Alexandre Gomes Gaigalas <alganet@gmail.com>
Assisted-by: Claude Code (Opus 4.5)
2026-02-05 17:32:42 +01:00

68 lines
2.3 KiB
Markdown

<!--
SPDX-License-Identifier: MIT
SPDX-FileCopyrightText: (c) Respect Project Contributors
SPDX-FileContributor: Alexandre Gomes Gaigalas <alganet@gmail.com>
SPDX-FileContributor: Henrique Moody <henriquemoody@gmail.com>
-->
# SubdivisionCode
- `SubdivisionCode(string $countryCode)`
Validates subdivision country codes according to [ISO 3166-2][].
The `$countryCode` must be a country in [ISO 3166-1 alpha-2][] format.
**This validator requires [sokil/php-isocodes][] and [php-isocodes-db-only][] to be installed.**
```php
v::subdivisionCode('BR')->assert('SP');
// Validation passes successfully
v::subdivisionCode('US')->assert('CA');
// Validation passes successfully
```
## Templates
### `SubdivisionCode::TEMPLATE_STANDARD`
| Mode | Template |
| ---------: | :----------------------------------------------------------------------- |
| `default` | {{subject}} must be a subdivision code of {{countryName&#124;trans}} |
| `inverted` | {{subject}} must not be a subdivision code of {{countryName&#124;trans}} |
## Template placeholders
| Placeholder | Description |
| ------------- | ---------------------------------------------------------------- |
| `countryName` | |
| `subject` | The validated input or the custom validator name (if specified). |
## Categorization
- ISO codes
- Localization
## Changelog
| Version | Description |
| ------: | :---------------------------------------------------------------- |
| 3.0.0 | Require [sokil/php-isocodes][] and [sokil/php-isocodes-db-only][] |
| 1.0.0 | Created |
## See Also
- [CountryCode](CountryCode.md)
- [CurrencyCode](CurrencyCode.md)
- [Nip](Nip.md)
- [Pesel](Pesel.md)
- [PolishIdCard](PolishIdCard.md)
- [PublicDomainSuffix](PublicDomainSuffix.md)
- [ShortCircuit](ShortCircuit.md)
- [Tld](Tld.md)
[ISO 3166-1 alpha-2]: http://en.wikipedia.org/wiki/ISO_3166-1_alpha-2 "ISO 3166-1 alpha-2"
[ISO 3166-2]: http://en.wikipedia.org/wiki/ISO_3166-2 "ISO 3166-2"
[sokil/php-isocodes]: https://github.com/sokil/php-isocodes
[sokil/php-isocodes-db-only]: https://github.com/sokil/php-isocodes-db-only