Translation.php

<?php

namespace Drupal\Core\Annotation;

use Drupal\Component\Annotation\AnnotationBase;
use Drupal\Core\StringTranslation\TranslatableMarkup;

/**
 * @defgroup plugin_translatable Annotation for translatable text
 * @{
 * Describes how to put translatable UI text into annotations.
 *
 * When providing plugin annotation, properties whose values are displayed in
 * the user interface should be made translatable. Much the same as how user
 * interface text elsewhere is wrapped in t() to make it translatable, in plugin
 * annotation, wrap translatable strings in the @ Translation() annotation.
 * For example:
 * @code
 *   title = @ Translation("Title of the plugin"),
 * @endcode
 * Remove spaces after @ in your actual plugin - these are put into this sample
 * code so that it is not recognized as annotation.
 *
 * To provide replacement values for placeholders, use the "arguments" array:
 * @code
 *   title = @ Translation("Bundle @title", arguments = {"@title" = "Foo"}),
 * @endcode
 *
 * It is also possible to provide a context with the text, similar to t():
 * @code
 *   title = @ Translation("Bundle", context = "Validation"),
 * @endcode
 * Other t() arguments like language code are not valid to pass in. Only
 * context is supported.
 *
 * @see i18n
 * @see annotation
 * @}
 */

/**
 * Defines a translatable annotation object.
 *
 * Some metadata within an annotation needs to be translatable. This class
 * supports that need by allowing both the translatable string and, if
 * specified, a context for that string. The string (with optional context)
 * is passed into t().
 *
 * @ingroup plugin_translatable
 *
 * @Annotation
 */
class Translation extends AnnotationBase {
    
    /**
     * The string translation object.
     *
     * @var \Drupal\Core\StringTranslation\TranslatableMarkup
     */
    protected $translation;
    
    /**
     * Constructs a new class instance.
     *
     * Parses values passed into this class through the t() function in Drupal and
     * handles an optional context for the string.
     *
     * @param array $values
     *   Possible array keys:
     *   - value (required): the string that is to be translated.
     *   - arguments (optional): an array with placeholder replacements, keyed by
     *     placeholder.
     *   - context (optional): a string that describes the context of "value";
     */
    public function __construct(array $values) {
        $string = $values['value'];
        $arguments = $values['arguments'] ?? [];
        $options = [];
        if (!empty($values['context'])) {
            $options = [
                'context' => $values['context'],
            ];
        }
        $this->translation = new TranslatableMarkup($string, $arguments, $options);
    }
    
    /**
     * {@inheritdoc}
     */
    public function get() {
        return $this->translation;
    }

}