NameAttribute.php

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<?php
namespace TYPO3\CMS\Form\Domain\Model\Attribute;

class NameAttribute extends \TYPO3\CMS\Form\Domain\Model\Attribute\AbstractAttribute {

    protected $addition;

    protected $returnValueWithoutPrefix = FALSE;

    public function getValueWithoutPrefix() {
        $value = (string) $this->value;
        // Change spaces into hyphens
        $value = preg_replace('/\\s/', '-', $value);
        // Remove non-word characters
        $value = preg_replace('/[^a-zA-Z0-9_\\-]+/', '', $value);
        if (empty($value)) {
            $value = $this->elementId;
        }
        return $value;
    }

    public function getValue() {
        $value = $this->getValueWithoutPrefix();
        if ($this->returnValueWithoutPrefix === FALSE) {
            $requestHandler = \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance('TYPO3\\CMS\\Form\\Request');
            $attribute = $requestHandler->getPrefix() . '[' . $value . ']' . $this->addition;
        } else {
            $attribute = $value;
        }
        return $attribute;
    }

    public function setAddition($addition) {
        $this->addition = (string) $addition;
        return $this;
    }

    public function setReturnValueWithoutPrefix($parameter) {
        $this->returnValueWithoutPrefix = (bool) $parameter;
    }

}