class TextField

class TextField extends FieldPluginBase {
    
    /**
     * {@inheritdoc}
     */
    public function getFieldFormatterType(Row $row) {
        $field_type = $this->getFieldType($row);
        $formatter_type = $row->getSourceProperty('formatter/type');
        switch ($field_type) {
            case 'string':
                $formatter_type = str_replace([
                    'text_default',
                    'text_plain',
                ], 'string', $formatter_type);
                break;
            case 'string_long':
                $formatter_type = str_replace([
                    'text_default',
                    'text_plain',
                ], 'basic_string', $formatter_type);
                break;
        }
        return $formatter_type;
    }
    
    /**
     * {@inheritdoc}
     */
    public function getFieldWidgetType(Row $row) {
        $field_type = $this->getFieldType($row);
        $widget_type = $row->getSourceProperty('widget/type');
        switch ($field_type) {
            case 'string':
                $widget_type = str_replace('text_textfield', 'string_textfield', $widget_type);
                break;
            case 'string_long':
                $widget_type = str_replace('text_textarea', 'string_textarea', $widget_type);
                break;
        }
        return $widget_type;
    }
    
    /**
     * {@inheritdoc}
     */
    public function getFieldType(Row $row) {
        $type = $row->getSourceProperty('type');
        $plain_text = FALSE;
        $filtered_text = FALSE;
        foreach ($row->getSourceProperty('instances') as $instance) {
            // Check if this field has plain text instances, filtered text instances,
            // or both.
            $data = unserialize($instance['data']);
            switch ($data['settings']['text_processing']) {
                case '0':
                    $plain_text = TRUE;
                    break;
                case '1':
                    $filtered_text = TRUE;
                    break;
            }
        }
        if (in_array($type, [
            'text',
            'text_long',
        ])) {
            // If a text or text_long field has only plain text instances, migrate it
            // to a string or string_long field.
            if ($plain_text && !$filtered_text) {
                $type = str_replace([
                    'text',
                    'text_long',
                ], [
                    'string',
                    'string_long',
                ], $type);
            }
            elseif ($plain_text && $filtered_text) {
                $field_name = $row->getSourceProperty('field_name');
                throw new MigrateSkipRowException("Can't migrate source field {$field_name} configured with both plain text and filtered text processing. See https://www.drupal.org/docs/8/upgrade/known-issues-when-upgrading-from-drupal-6-or-7-to-drupal-8#plain-text");
            }
        }
        elseif ($type == 'text_with_summary' && $plain_text) {
            // If a text_with_summary field has plain text instances, skip the row
            // since there's no such thing as a string_with_summary field.
            $field_name = $row->getSourceProperty('field_name');
            throw new MigrateSkipRowException("Can't migrate source field {$field_name} of type text_with_summary configured with plain text processing. See https://www.drupal.org/docs/8/upgrade/known-issues-when-upgrading-from-drupal-6-or-7-to-drupal-8#plain-text");
        }
        return $type;
    }

}