Text.php

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<?php
namespace Magento\Eav\Model\Attribute\Data;

use Magento\Framework\App\RequestInterface;

class Text extends \Magento\Eav\Model\Attribute\Data\AbstractData
{
    protected $_string;

    public function __construct(
        \Magento\Framework\Stdlib\DateTime\TimezoneInterface $localeDate,
        \Psr\Log\LoggerInterface $logger,
        \Magento\Framework\Locale\ResolverInterface $localeResolver,
        \Magento\Framework\Stdlib\StringUtils $stringHelper
    ) {
        parent::__construct($localeDate, $logger, $localeResolver);
        $this->_string = $stringHelper;
    }

    public function extractValue(RequestInterface $request)
    {
        $value = $this->_getRequestValue($request);
        return $this->_applyInputFilter($value);
    }

    public function validateValue($value)
    {
        $errors = [];
        $attribute = $this->getAttribute();

        if ($value === false) {
            // try to load original value and validate it
            $value = $this->getEntity()->getDataUsingMethod($attribute->getAttributeCode());
        }

        if ($attribute->getIsRequired() && empty($value) && $value !== '0') {
            $label = __($attribute->getStoreLabel());
            $errors[] = __('"%1" is a required value.', $label);
        }

        if (!$errors && !$attribute->getIsRequired() && empty($value)) {
            return true;
        }

        $result = $this->validateLength($attribute, $value);
        if (count($result) !== 0) {
            $errors = array_merge($errors, $result);
        }

        $result = $this->_validateInputRule($value);
        if ($result !== true) {
            $errors = array_merge($errors, $result);
        }
        if (count($errors) == 0) {
            return true;
        }

        return $errors;
    }

    public function compactValue($value)
    {
        if ($value !== false) {
            $this->getEntity()->setDataUsingMethod($this->getAttribute()->getAttributeCode(), $value);
        }
        return $this;
    }

    public function restoreValue($value)
    {
        return $this->compactValue($value);
    }

    public function outputValue($format = \Magento\Eav\Model\AttributeDataFactory::OUTPUT_FORMAT_TEXT)
    {
        $value = $this->getEntity()->getData($this->getAttribute()->getAttributeCode());
        $value = $this->_applyOutputFilter($value);

        return $value;
    }

    private function validateLength(\Magento\Eav\Model\Attribute $attribute, $value): array
    {
        $errors = [];
        $length = $this->_string->strlen(trim($value));
        $validateRules = $attribute->getValidateRules();

        if (!empty($validateRules['input_validation'])) {
            if (!empty($validateRules['min_text_length']) && $length < $validateRules['min_text_length']) {
                $label = __($attribute->getStoreLabel());
                $v = $validateRules['min_text_length'];
                $errors[] = __('"%1" length must be equal or greater than %2 characters.', $label, $v);
            }
            if (!empty($validateRules['max_text_length']) && $length > $validateRules['max_text_length']) {
                $label = __($attribute->getStoreLabel());
                $v = $validateRules['max_text_length'];
                $errors[] = __('"%1" length must be equal or less than %2 characters.', $label, $v);
            }
        }

        return $errors;
    }
}