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<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Contracts\Translation;

/**
 * @author Fabien Potencier <fabien@symfony.com>
 */
interface TranslatorInterface
{
    /**
     * Translates the given message.
     *
     * When a number is provided as a parameter named "%count%", the message is parsed for plural
     * forms and a translation is chosen according to this number using the following rules:
     *
     * Given a message with different plural translations separated by a
     * pipe (|), this method returns the correct portion of the message based
     * on the given number, locale and the pluralization rules in the message
     * itself.
     *
     * The message supports two different types of pluralization rules:
     *
     * interval: {0} There are no apples|{1} There is one apple|]1,Inf] There are %count% apples
     * indexed:  There is one apple|There are %count% apples
     *
     * The indexed solution can also contain labels (e.g. one: There is one apple).
     * This is purely for making the translations more clear - it does not
     * affect the functionality.
     *
     * The two methods can also be mixed:
     *     {0} There are no apples|one: There is one apple|more: There are %count% apples
     *
     * An interval can represent a finite set of numbers:
     *  {1,2,3,4}
     *
     * An interval can represent numbers between two numbers:
     *  [1, +Inf]
     *  ]-1,2[
     *
     * The left delimiter can be [ (inclusive) or ] (exclusive).
     * The right delimiter can be [ (exclusive) or ] (inclusive).
     * Beside numbers, you can use -Inf and +Inf for the infinite.
     *
     * @see https://en.wikipedia.org/wiki/ISO_31-11
     *
     * @param string      $id         The message id (may also be an object that can be cast to string)
     * @param array       $parameters An array of parameters for the message
     * @param string|null $domain     The domain for the message or null to use the default
     * @param string|null $locale     The locale or null to use the default
     *
     * @throws \InvalidArgumentException If the locale contains invalid characters
     */
    public function trans(string $id, array $parameters = [], string $domain = null, string $locale = null): string;

    /**
     * Returns the default locale.
     */
    public function getLocale(): string;
}