Update for Symfony4 and above

composer.json

@@ -18,9 +18,9 @@
         }
     },
     "require": {
-      "symfony/form": "~2.8|~3.0|^4.0",
-      "symfony/translation": "~2.3|~3.0|^4.0",
-      "symfony/serializer": "~2.8|~3.0|^4.0"
+      "symfony/form": "^4.0",
+      "symfony/translation": "^4.0",
+      "symfony/serializer": "^4.0"
     },
     "require-dev": {
         "escapestudios/symfony2-coding-standard": "^2.9",

src/Limenius/Liform/Serializer/Normalizer/FormErrorNormalizer.php

@@ -14,7 +14,7 @@
 use Symfony\Component\Form\FormError;
 use Symfony\Component\Form\FormInterface;
 use Symfony\Component\Serializer\Normalizer\NormalizerInterface;
-use Symfony\Component\Translation\TranslatorInterface;
+use Symfony\Contracts\Translation\TranslatorInterface;
 
 /**
  * Normalizes invalid Form instances.

src/Limenius/Liform/Transformer/AbstractTransformer.php

@@ -13,7 +13,7 @@
 
 use Symfony\Component\Form\FormInterface;
 use Symfony\Component\Form\FormTypeGuesserInterface;
-use Symfony\Component\Translation\TranslatorInterface;
+use Symfony\Contracts\Translation\TranslatorInterface;
 
 /**
  * @author Nacho Martín <[email protected]>

src/Limenius/Liform/Transformer/ArrayTransformer.php

@@ -15,7 +15,7 @@
 use Limenius\Liform\ResolverInterface;
 use Symfony\Component\Form\FormInterface;
 use Symfony\Component\Form\FormTypeGuesserInterface;
-use Symfony\Component\Translation\TranslatorInterface;
+use Symfony\Contracts\Translation\TranslatorInterface;
 
 /**
  * @author Nacho Martín <[email protected]>

src/Limenius/Liform/Transformer/CompoundTransformer.php

@@ -11,11 +11,10 @@
 
 namespace Limenius\Liform\Transformer;
 
-use Limenius\Liform\FormUtil;
 use Limenius\Liform\ResolverInterface;
 use Symfony\Component\Form\FormInterface;
 use Symfony\Component\Form\FormTypeGuesserInterface;
-use Symfony\Component\Translation\TranslatorInterface;
+use Symfony\Contracts\Translation\TranslatorInterface;
 
 /**
  * @author Nacho Martín <[email protected]>

tests/Limenius/Liform/Tests/LiformTestCase.php

@@ -14,7 +14,7 @@
 use Limenius\Liform\Form\Extension\AddLiformExtension;
 use PHPUnit\Framework\TestCase;
 use Symfony\Component\Form\Forms;
-use Symfony\Component\Translation\TranslatorInterface;
+use Symfony\Contracts\Translation\TranslatorInterface;
 
 /**
  *