Apply php-cs-fixer fix --rules nullable_type_declaration_for_default_null_value

Author: nicolas-grekas

ExpressionFunction.php

@@ -81,7 +81,7 @@ public function getEvaluator()
      * @throws \InvalidArgumentException if given PHP function name is in namespace
      *                                   and expression function name is not defined
      */
-    public static function fromPhp(string $phpFunctionName, string $expressionFunctionName = null)
+    public static function fromPhp(string $phpFunctionName, ?string $expressionFunctionName = null)
     {
         $phpFunctionName = ltrim($phpFunctionName, '\\');
         if (!\function_exists($phpFunctionName)) {

ExpressionLanguage.php

@@ -34,7 +34,7 @@ class ExpressionLanguage
     /**
      * @param ExpressionFunctionProviderInterface[] $providers
      */
-    public function __construct(CacheItemPoolInterface $cache = null, array $providers = [])
+    public function __construct(?CacheItemPoolInterface $cache = null, array $providers = [])
     {
         $this->cache = $cache ?? new ArrayAdapter();
         $this->registerFunctions();

Node/ArrayNode.php

@@ -27,7 +27,7 @@ public function __construct()
         $this->index = -1;
     }
 
-    public function addElement(Node $value, Node $key = null)
+    public function addElement(Node $value, ?Node $key = null)
     {
         if (null === $key) {
             $key = new ConstantNode(++$this->index);

SyntaxError.php

@@ -13,7 +13,7 @@
 
 class SyntaxError extends \LogicException
 {
-    public function __construct(string $message, int $cursor = 0, string $expression = '', string $subject = null, array $proposals = null)
+    public function __construct(string $message, int $cursor = 0, string $expression = '', ?string $subject = null, ?array $proposals = null)
     {
         $message = sprintf('%s around position %d', rtrim($message, '.'), $cursor);
         if ($expression) {

Tests/ParserTest.php

@@ -243,7 +243,7 @@ public function testNameProposal()
     /**
      * @dataProvider getLintData
      */
-    public function testLint($expression, $names, string $exception = null)
+    public function testLint($expression, $names, ?string $exception = null)
     {
         if ($exception) {
             $this->expectException(SyntaxError::class);

Token.php

@@ -56,7 +56,7 @@ public function __toString()
      *
      * @return bool
      */
-    public function test(string $type, string $value = null)
+    public function test(string $type, ?string $value = null)
     {
         return $this->type === $type && (null === $value || $this->value == $value);
     }

TokenStream.php

@@ -58,7 +58,7 @@ public function next()
     /**
      * @param string|null $message The syntax error message
      */
-    public function expect(string $type, string $value = null, string $message = null)
+    public function expect(string $type, ?string $value = null, ?string $message = null)
     {
         $token = $this->current;
         if (!$token->test($type, $value)) {