SuggestedAttributeList.php

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<?php
namespace Magento\ConfigurableProduct\Model;

class SuggestedAttributeList
{
    protected $configurableAttributeHandler;

    protected $_resourceHelper;

    public function __construct(
        \Magento\ConfigurableProduct\Model\ConfigurableAttributeHandler $configurableAttributeHandler,
        \Magento\Catalog\Model\ResourceModel\Helper $resourceHelper
    ) {
        $this->configurableAttributeHandler = $configurableAttributeHandler;
        $this->_resourceHelper = $resourceHelper;
    }

    public function getSuggestedAttributes($labelPart)
    {
        $escapedLabelPart = $this->_resourceHelper->addLikeEscape($labelPart, ['position' => 'any']);
        $collection = $this->configurableAttributeHandler->getApplicableAttributes()->addFieldToFilter(
            'frontend_label',
            ['like' => $escapedLabelPart]
        );
        $result = [];
        foreach ($collection->getItems() as $id => $attribute) {
            if ($this->configurableAttributeHandler->isAttributeApplicable($attribute)) {
                $result[$id] = [
                    'id' => $attribute->getId(),
                    'label' => $attribute->getFrontendLabel(),
                    'code' => $attribute->getAttributeCode(),
                    'options' => $attribute->getSource()->getAllOptions(false),
                ];
            }
        }
        return $result;
    }
}