TASK: Move Scanner::isEnd into $lookAhead->type() and make it nullable

Author: mhsdesign

src/Parser/Ast/ExpressionNode.php

@@ -63,7 +63,7 @@ public static function fromTokens(\Iterator &$tokens, Precedence $precedence = P
                 $lookAhead->shift();
 
                 while (true) {
-                    switch (Scanner::isEnd($lookAhead->tokens) ?: $lookAhead->type()) {
+                    switch ($lookAhead->type()) {
                         case TokenType::STRING:
                         case TokenType::COLON:
                         case TokenType::COMMA:

src/Parser/Tokenizer/LookAhead.php

@@ -70,8 +70,11 @@ public function shift(): void
         Scanner::skipOne($this->tokens);
     }
 
-    public function type(): TokenType
+    public function type(): ?TokenType
     {
+        if (Scanner::isEnd($this->tokens)) {
+            return null;
+        }
         return Scanner::type($this->tokens);
     }
 }