Referencing translation inside of another translation - symfony

Question

I have this situation:
unit:
sqkm: Square Kilometers
my_translation: Size is %size% ## I want to append the value of unit.sqkm here ##
Is there a way to reference the translation of the unit.sqkm inside the my_translation key?
Edit: Please note that i do know how i can do this via twig. My question is: is there a way to do this in the translation files.

Answer 1

I extended Symfony Tanslator for this:
<?php
namespace Bundle\Program\Translation;
use Symfony\Bundle\FrameworkBundle\Translation\Translator as BaseTranslator;
class Translator extends BaseTranslator
{
/**
* Uses Symfony Translator to translate, but enables referencing other translations via ##code##
*/
public function trans($id, array $parameters = array(), $domain = null, $locale = null)
{
$text = parent::trans($id, $parameters, $domain, $locale);
$translations = [];
$delimiter = "##";
$strLen = strlen($delimiter);
$pos = strpos($text, $delimiter);
while ($pos !== false) {
$startsAt = $pos + $strLen;
$endsAt = strpos($text, $delimiter, $startsAt);
$translations[] = $delimiter . substr($text, $startsAt, $endsAt - $startsAt) . $delimiter;
$pos = strpos($text, $delimiter, $endsAt + $strLen);
}
foreach ($translations as $translation) {
$translationTrim = str_replace($delimiter, '', $translation);
$text = str_replace($translation, $this->trans($translationTrim, $parameters, $domain, $locale), $text);
}
return $text;
}
}
Then replace the Symfony translator class via parameters:
parameters:
translator.class: Bundle\Program\Translation\Translator
Now you can reference other translations via ##other.translation## INSIDE your yml file.

Answer 2

In your Twig template, try this :
{{ 'my_translation' | trans({'%size%': size, 'unit.sqkm' : ('unit.sqkm'|trans)}) }}

Answer 3

You can use translated values inside other translations.
{{ 'paragraph' | trans({ '%size%': 3, '%unit%': 'unit' | trans()}) }}
Where unit itself is another key for a translation. Your translation file however could look like this:
paragraph: Size is %size% %unit%
unit: Square Kilometers

Answer 4

If, like me, you want to achieve this in Symfony 4.1, here's your solution
(many thanks to #Kim's answer and #Aurelijus Rozenas's answer, all credits -apart my 4 hours trying that- go to them)
First, create your new Translator class (here: src/Common/ReferenceTranslator.php)
I can't manage to find a solution where I would extend the base translator class straight in the class code, let me know if you have one
# src/Common/ReferenceTranslator.php
namespace App\Common;
use Symfony\Component\Translation\TranslatorBagInterface;
use Symfony\Component\Translation\TranslatorInterface;
class ReferenceTranslator implements TranslatorInterface, TranslatorBagInterface
{
/** #var TranslatorBagInterface|TranslatorInterface */
protected $translator;
/**
* #param TranslatorInterface|TranslatorBagInterface $translator
*/
public function __construct($translator)
{
$this->translator = $translator;
}
/**
* Uses Symfony Translator to translate, but enables referencing other translations via ##code##
* #param $id
* #param array $parameters
* #param null $domain
* #param null $locale
* #return mixed|string
*/
public function trans($id, array $parameters = array(), $domain = null, $locale = null)
{
$text = $this->translator->trans($id, $parameters, $domain, $locale);
$translations = [];
$delimiter = "##";
$strLen = strlen($delimiter);
$pos = strpos($text, $delimiter);
while ($pos !== false) {
$startsAt = $pos + $strLen;
$endsAt = strpos($text, $delimiter, $startsAt);
$translations[] = $delimiter . substr($text, $startsAt, $endsAt - $startsAt) . $delimiter;
$pos = strpos($text, $delimiter, $endsAt + $strLen);
}
foreach ($translations as $translation) {
$translationTrim = str_replace($delimiter, '', $translation);
$text = str_replace($translation, $this->trans($translationTrim, $parameters, $domain, $locale), $text);
}
return $text;
}
/**
* #param string $id
* #param int $number
* #param array $parameters
* #param null $domain
* #param null $locale
*
* #return string
*/
public function transChoice($id, $number, array $parameters = [], $domain = null, $locale = null)
{
return $this->translator->transChoice($id, $number, $parameters, $domain, $locale);
}
/**
* #param string $locale
*/
public function setLocale($locale)
{
$this->translator->setLocale($locale);
}
/**
* #return string
*/
public function getLocale()
{
return $this->translator->getLocale();
}
/**
* #param string|null $locale
*
* #return \Symfony\Component\Translation\MessageCatalogueInterface
*/
public function getCatalogue($locale = null)
{
return $this->translator->getCatalogue($locale);
}
}
And then edit your services.yaml file
# app/config/services.yml
#[...]
services:
#[...]
# Custom Translator (References)
# Overrides the Translator Service (is still available as #app.decorating_translator.inner)
app.decorating_translator:
class: App\Common\ReferenceTranslator
decorates: translator
arguments:
- '#app.decorating_translator.inner'
public: false
And voilà !
Again, don't hesitate if you know how to improve this, as I'm not a Symfony expert !

Answer 5

The TBG answer works,
for Symfony 4.4 here is the code in service.yaml
Services
App\Common\ReferenceTranslator:
arguments:
$translator: '#translator'
And dont forget to implement LocaleAwareInterface too !