Remove support for unmaintained Symfony versions

composer.json

@@ -12,10 +12,10 @@
     }
   ],
   "require": {
-    "php": "^7.2 || ^8.0",
+    "php": "^7.2.5 || ^8.0",
     "ext-dom": "*",
     "ext-libxml": "*",
-    "symfony/css-selector": "^2.7 || ^3.0 || ^4.0 || ^5.0 || ^6.0 || ^7.0"
+    "symfony/css-selector": "^5.4 || ^6.0 || ^7.0"
   },
   "require-dev": {
     "phpunit/phpunit": "^8.5.21 || ^9.5.10"
@@ -32,7 +32,7 @@
   },
   "extra": {
     "branch-alias": {
-      "dev-master": "2.2.x-dev"
+      "dev-master": "2.x-dev"
     }
   }
 }

src/CssToInlineStyles.php

@@ -2,7 +2,6 @@
 
 namespace TijsVerkoyen\CssToInlineStyles;
 
-use Symfony\Component\CssSelector\CssSelector;
 use Symfony\Component\CssSelector\CssSelectorConverter;
 use Symfony\Component\CssSelector\Exception\ExceptionInterface;
 use TijsVerkoyen\CssToInlineStyles\Css\Processor;
@@ -11,13 +10,14 @@
 
 class CssToInlineStyles
 {
+    /**
+     * @var CssSelectorConverter
+     */
     private $cssConverter;
 
     public function __construct()
     {
-        if (class_exists('Symfony\Component\CssSelector\CssSelectorConverter')) {
-            $this->cssConverter = new CssSelectorConverter();
-        }
+        $this->cssConverter = new CssSelectorConverter();
     }
 
     /**
@@ -166,12 +166,7 @@ protected function inline(\DOMDocument $document, array $rules)
 
         foreach ($rules as $rule) {
             try {
-                if (null !== $this->cssConverter) {
-                    $expression = $this->cssConverter->toXPath($rule->getSelector());
-                } else {
-                    // Compatibility layer for Symfony 2.7 and older
-                    $expression = CssSelector::toXPath($rule->getSelector());
-                }
+                $expression = $this->cssConverter->toXPath($rule->getSelector());
             } catch (ExceptionInterface $e) {
                 continue;
             }