drupal_module__reinstall/src/Plugin/migrate/source/ReinstallTermSource.php

<?php

namespace Drupal\reinstall\Plugin\migrate\source;

use Drupal\migrate\Plugin\MigrationInterface;
use Drupal\migrate\Row;

/**
 * Source plugin for terms from a YAML file.
 *
 * @MigrateSource(
 *   id = "reinstall_terms"
 * )
 */
class ReinstallTermSource extends SimpleSource {

  /**
   * Constructor.
   */
  public function __construct(
    array $configuration,
    string $pluginId,
    array $pluginDefinition,
    MigrationInterface $migration
  ) {
    parent::__construct($configuration, $pluginId, $pluginDefinition, $migration);
    $rawRecords = array_map([$this, 'flattenRecord'], $this->initialParse($configuration));
    $this->records = $rawRecords;
  }

  protected function flattenRecord($record) {
    $row = new Row($record);
    $this->flattenRow($row);
    return $row->getSource();
  }

  /**
   * {@inheritdoc}
   */
  public function fields() {
    $ret = [
      'changed'           => 'Modification timestamp',
      'default_langcode'  => 'ISO 639 default language code',
      'description'       => 'The entity description',
      'langcode'          => 'ISO 639 language code',
      'name'              => 'The term name (PK)',
      'parent'            => 'Parent term ID',
      'path'              => 'Optional path alias',
      'tid'               => 'Taxonomy term ID',
      'uuid'              => 'UUID',
      'vid'               => 'Vocabulary ID',
      'weight'            => 'Poids',
    ];

    return $ret;
  }

  /**
   * {@inheritdoc}
   */
  public function getIds() {
    $ids = [
      'tid' => [
        'type' => 'integer',
      ],
    ];

    return $ids;
  }

  /**
   * Obtain the term parents from either of their two formats.
   *
   * @param mixed $source
   *   A parent, from the migration pipeline.
   *
   * @return mixed
   *   The parent, as its target_id.
   *
   * @see (reinstall)/README.md
   */
  public static function getParent($source) {
    if (is_scalar($source)) {
      return $source;
    }
    elseif (isset($source['target_id'])) {
      return $source['target_id'];
    }
  }
}