AttributeMapper.php

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<?php
namespace Magento\Ui\Component\Form;

class AttributeMapper
{
    private $formElementMap = [
        'text' => 'input',
        'hidden' => 'input',
        'boolean' => 'checkbox',
    ];

    private $metaPropertiesMap = [
        'dataType' => 'getFrontendInput',
        'visible' => 'getIsVisible',
        'required' => 'getIsRequired',
        'label' => 'getStoreLabel',
        'sortOrder' => 'getSortOrder',
        'notice' => 'getNote',
        'default' => 'getDefaultValue',
        'size' => 'getMultilineCount'
    ];

    protected $validationRules = [
        'input_validation' => [
            'email' => ['validate-email' => true],
            'date' => ['validate-date' => true],
        ],
    ];

    public function map($attribute)
    {
        foreach ($this->metaPropertiesMap as $metaName => $methodName) {
            $value = $attribute->$methodName();
            $meta[$metaName] = $value;
            if ('getFrontendInput' === $methodName) {
                $meta['formElement'] = isset($this->formElementMap[$value])
                    ? $this->formElementMap[$value]
                    : $value;
            }
        }
        if ($attribute->usesSource()) {
            $meta['options'] = $attribute->getSource()->getAllOptions();
        }

        $rules = [];
        if (isset($meta['required']) && $meta['required'] == 1) {
            $rules['required-entry'] = true;
        }
        foreach ($attribute->getValidateRules() as $name => $value) {
            if (isset($this->validationRules[$name][$value])) {
                $rules = array_merge($rules, $this->validationRules[$name][$value]);
            } else {
                $rules[$name] = $value;
            }
        }
        $meta['validation'] = $rules;
        return $meta;
    }
}