LengthValidator.php

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<?php
namespace TYPO3\CMS\Form\Validation;

class LengthValidator extends \TYPO3\CMS\Form\Validation\AbstractValidator {

    const LOCALISATION_OBJECT_NAME = 'tx_form_system_validate_length';

    protected $minimum;

    protected $maximum;

    protected $charsetConverter = NULL;

    public function __construct($arguments) {
        $this->charsetConverter = \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance('TYPO3\\CMS\\Core\\Charset\\CharsetConverter');
        $this->setMinimum($arguments['minimum'])->setMaximum($arguments['maximum']);
        parent::__construct($arguments);
    }

    public function isValid() {
        if ($this->requestHandler->has($this->fieldName)) {
            $value = $this->requestHandler->getByMethod($this->fieldName);
            $length = $this->charsetConverter->strlen('utf-8', $value);
            if ($length < $this->minimum) {
                return FALSE;
            }
            if ($this->maximum !== NULL && $length > $this->maximum) {
                return FALSE;
            }
        }
        return TRUE;
    }

    public function setMinimum($minimum) {
        $this->minimum = (int)$minimum;
        return $this;
    }

    public function setMaximum($maximum) {
        if (empty($maximum)) {
            $this->maximum = NULL;
        } else {
            $this->maximum = (int)$maximum;
        }
        return $this;
    }

    protected function getLocalLanguageLabel($type) {
        $label = static::LOCALISATION_OBJECT_NAME . '.' . $type;
        $messages[] = $this->localizationHandler->getLocalLanguageLabel($label);
        if ($this->maximum !== NULL) {
            $messages[] = $this->localizationHandler->getLocalLanguageLabel($label . '2');
        }
        $message = implode(', ', $messages);
        return $message;
    }

    protected function substituteValues($message) {
        return str_replace(
            array('%minimum', '%maximum'),
            array($this->minimum, $this->maximum),
            $message
        );
    }

}