AlphabeticValidator.php

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

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

    const LOCALISATION_OBJECT_NAME = 'tx_form_system_validate_alphabetic';

    protected $allowWhiteSpace;

    protected $filter;

    public function __construct($arguments = array()) {
        $this->setAllowWhiteSpace($arguments['allowWhiteSpace']);
        parent::__construct($arguments);
    }

    public function isValid() {
        if ($this->requestHandler->has($this->fieldName)) {
            $value = $this->requestHandler->getByMethod($this->fieldName);
            if ($this->filter === NULL) {
                $className = 'TYPO3\\CMS\\Form\\Filter\\AlphabeticFilter';
                $this->filter = \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance($className);
            }
            $this->filter->setAllowWhiteSpace($this->allowWhiteSpace);
            if ($this->filter->filter($value) !== $value) {
                return FALSE;
            }
        }
        return TRUE;
    }

    public function setAllowWhiteSpace($allowWhiteSpace) {
        if ($allowWhiteSpace === NULL) {
            $this->allowWhiteSpace = FALSE;
        } else {
            $this->allowWhiteSpace = (bool) $allowWhiteSpace;
        }
        return $this;
    }

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

}