Fix errors of phpstan 2.1+

Author: Kirill Nesmeyanov

src/Exception/ParsingException.php

@@ -45,8 +45,8 @@ public function withSource(string $source, int $offset): self
         return new static(
             source: $source,
             offset: $offset,
-            message: $this->message,
-            code: $this->code,
+            message: $this->getMessage(),
+            code: $this->getCode(),
             previous: $this,
         );
     }

src/Tag/Content/OptionalIdentifierApplicator.php

@@ -16,13 +16,14 @@ final class OptionalIdentifierApplicator extends Applicator
      */
     public function __invoke(Content $lexer): ?string
     {
+        // @phpstan-ignore-next-line : PHPStan false positive
         if ($lexer->value === '') {
             return null;
         }
 
         \preg_match('/([a-zA-Z_\x80-\xff][a-zA-Z0-9_\x80-\xff]*)\b/u', $lexer->value, $matches);
 
-        if (\count($matches) !== 2 || $matches[1] === '') {
+        if (\count($matches) !== 2) {
             return null;
         }
 

src/Tag/Content/OptionalVariableNameApplicator.php

@@ -22,7 +22,7 @@ public function __invoke(Content $lexer): ?string
 
         \preg_match('/\$([a-zA-Z_\x80-\xff][a-zA-Z0-9_\x80-\xff]*)\b/u', $lexer->value, $matches);
 
-        if (\count($matches) !== 2 || $matches[1] === '') {
+        if (\count($matches) !== 2) {
             return null;
         }