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<?php
declare(strict_types=1);
namespace Askonomm\Validator;
/**
* The Validator takes in an array of fields, an array of
* rules and optionally an array of validators. If no validators
* are provided, default validators will be used instead, which are:
*
* - `Validators::len()`
* - `Validators::email()`
* - `Validators::required()`
*
* The key of each item in the `$fields` array must correspond to the
* the key of each item in the `$rules` array, so that Validator
* would know how to connect the two to each other.
*
* The `$rules` must have a value that is a string where the rules
* are separated by a `|` character, and each rule must match the key of
* the implemented validator, such as `len`, `email` or one that you have
* implemented yourself. Additionally, each rule can take in a modifier,
* where the name of the rule and the modifier is separated by a `:` character.
*
* For example, say we have a validator called `len` which takes a modifier that
* lets that validator validate the length of a string, in such a case we'd write
* that rule as `len:8`, which would indicate using a `len` validator and passing
* a modifier with the value `8` to it.
*
* Example usage of Validator:
*
* ```php
* $fields = ['email' => 'asko@bien.ee'];
* $rules = ['email' => 'required|email'];
* $validator = new Validator($fields, $rules);
*
* if ($validator->fails()) {
* return $validator->errors();
* }
* ```
*
* If you want to implement your own validators then simply create
* a data structure that looks like this:
*
* ```php
* // Create the validator
* $validator = [
* 'error' => function(string $field, $modifier): string {
* return "${field} had some sort of an error.";
* },
* 'validates' => function(string $value, $modifier): bool {
* // validate your $value here and return true if
* // the validation succeeded, or false if there was
* // an error, in which case the rule's error will be
* // added to the array of errors used by Validator.
* }
* ];
*
* // Add validator to Validator
* $validator = new Validator($fields, $rules, [
* 'rule-name' => $validator
* ]);
* ```
*
* If you want to also use the default validators, and add yours as an extra,
* simply join the array of your validators with the array that you get from
* `$validator->defaultValidators()`, for example:
*
* ```php
* $validators = [
* ...$this->defaultValidators(),
* 'rule-name' => $validator,
* ]);
*
* $validator = new Validator($fields, $rules, $validators);
* ```
* @author Asko Nomm <asko@bien.ee>
*/
class Validator
{
private array $errors = [];
public function __construct(
private array $fields,
private array $rules,
array $validators = [],
) {
if (empty($validators)) {
$this->validators = $this->defaultValidators();
}
$this->validate();
}
/**
* Returns the default, built-in validators.
*
* @return array
*/
public function defaultValidators(): array
{
return [
'len' => Validators::len(),
'email' => Validators::email(),
'required' => Validators::required(),
];
}
/**
* Runs `$this->rules` over `$this->fields` to construct
* potential errors that will be stored as an array of strings
* in `$this->errors`.
*
* @return void
*/
private function validate(): void
{
foreach ($this->rules as $field => $rule) {
$value = $this->fields[$field];
foreach (explode('|', $rule) as $item) {
if (str_contains($item, ':')) {
[$name, $modifier] = explode(':', $item);
if (!$this->rules[$name]['validates']($value, $modifier)) {
$this->errors[] = $this->rules[$name]['error']($field, $modifier);
}
} else {
if (!$this->rules[$item]['validates']($value)) {
$this->errors[] = $this->rules[$item]['error']($field);
}
}
}
}
}
/**
* Returns a boolean `true` if there have been any errors.
* Returns `false` otherwise.
*
* @return boolean
*/
public function fails(): bool
{
return count($this->errors) !== 0;
}
/**
* Returns an array of strings where each string
* is a single error that happened during validation.
*
* @return array
*/
public function errors(): array
{
return $this->errors;
}
/**
* If errors are present, returns the first one.
* Otherwise returns an empty string.
*
* @return string
*/
public function firstError(): string
{
if (count($this->errors) > 0) {
return $this->errors[0];
}
return '';
}
}
|
