Fix phpstan errors

Author: FabianoLothor

src/Recurr/Rule.php

@@ -274,7 +274,7 @@ public static function createFromText($text, $startDate = null, $endDate = null,
             throw new InvalidRRule('Unable to parse text: ' . $text);
         }
 
-        $rule = new static($options, $startDate, $endDate, $timezone);
+        $rule = new self($options, $startDate, $endDate, $timezone);
 
         return $rule;
     }

src/Recurr/TextParser.php

@@ -17,12 +17,26 @@
  */
 class TextParser
 {
-    private $tokens = [];
-    private $text = '';
-    private $symbol = null;
-    private $value = null;
-    private $done = true;
-    private $options = [];
+    /**
+     * @var array<string, string>
+     */
+    private array $tokens = [];
+    
+    private string $text = '';
+    
+    private ?string $symbol = null;
+    
+    /**
+     * @var array<string>|null
+     */
+    private ?array $value = null;
+    
+    private bool $done = true;
+    
+    /**
+     * @var array<string, mixed>
+     */
+    private array $options = [];
 
     public function __construct()
     {
@@ -33,9 +47,9 @@ public function __construct()
      * Parse natural language text into Rule options array
      * 
      * @param string $text Natural language text describing recurrence
-     * @return array Options array suitable for Rule constructor
+     * @return array<string, mixed>|null Options array suitable for Rule constructor
      */
-    public function parseText($text)
+    public function parseText(string $text): ?array
     {
         $this->options = [];
         $this->text = strtolower(trim($text));
@@ -55,7 +69,7 @@ public function parseText($text)
         }
     }
 
-    private function initializeTokens()
+    private function initializeTokens(): void
     {
         $this->tokens = [
             'SKIP' => '/^[ \r\n\t]+|^\.$/i',
@@ -101,7 +115,7 @@ private function initializeTokens()
         ];
     }
 
-    private function nextSymbol()
+    private function nextSymbol(): bool
     {
         $this->symbol = null;
         $this->value = null;
@@ -143,7 +157,11 @@ private function nextSymbol()
         return true;
     }
 
-    private function accept($name)
+    /**
+     * @param string $name
+     * @return array<string>|false
+     */
+    private function accept(string $name): array|false
     {
         if ($this->symbol === $name) {
             $value = $this->value;
@@ -153,25 +171,32 @@ private function accept($name)
         return false;
     }
 
-    private function expect($name)
+    /**
+     * @param string $name
+     * @return bool
+     */
+    private function expect(string $name): bool
     {
         if ($this->accept($name)) {
             return true;
         }
         throw new InvalidArgument("Expected $name but found " . $this->symbol);
     }
 
-    private function acceptNumber()
+    /**
+     * @return array<string>|false
+     */
+    private function acceptNumber(): array|false
     {
         return $this->accept('number');
     }
 
-    private function isDone()
+    private function isDone(): bool
     {
         return $this->done && $this->symbol === null;
     }
 
-    private function parseStatement()
+    private function parseStatement(): void
     {
         // every [n]
         $this->expect('every');