[CssSelector] [5.0] Add type-hint whenever possible

Author: Simperfit

CssSelectorConverter.php

@@ -53,12 +53,9 @@ public function __construct(bool $html = true)
      * Optionally, a prefix can be added to the resulting XPath
      * expression with the $prefix parameter.
      *
-     * @param string $cssExpr The CSS expression
-     * @param string $prefix  An optional prefix for the XPath expression
-     *
      * @return string
      */
-    public function toXPath($cssExpr, $prefix = 'descendant-or-self::')
+    public function toXPath(string $cssExpr, string $prefix = 'descendant-or-self::')
     {
         return $this->translator->cssToXPath($cssExpr, $prefix);
     }

Exception/SyntaxErrorException.php

@@ -29,7 +29,7 @@ class SyntaxErrorException extends ParseException
      *
      * @return self
      */
-    public static function unexpectedToken($expectedValue, Token $foundToken)
+    public static function unexpectedToken(string $expectedValue, Token $foundToken)
     {
         return new self(sprintf('Expected %s, but %s found.', $expectedValue, $foundToken));
     }
@@ -40,7 +40,7 @@ public static function unexpectedToken($expectedValue, Token $foundToken)
      *
      * @return self
      */
-    public static function pseudoElementFound($pseudoElement, $unexpectedLocation)
+    public static function pseudoElementFound(string $pseudoElement, string $unexpectedLocation)
     {
         return new self(sprintf('Unexpected pseudo-element "::%s" found %s.', $pseudoElement, $unexpectedLocation));
     }
@@ -50,7 +50,7 @@ public static function pseudoElementFound($pseudoElement, $unexpectedLocation)
      *
      * @return self
      */
-    public static function unclosedString($position)
+    public static function unclosedString(int $position)
     {
         return new self(sprintf('Unclosed/invalid string at %s.', $position));
     }