add AtMostModifier selector modifier

src/Selector/Modifier/AtMostModifier.php

@@ -0,0 +1,39 @@
+<?php declare(strict_types=1);
+
+namespace PHPat\Selector\Modifier;
+
+use PHPat\Selector\SelectorInterface;
+use PHPStan\Reflection\ClassReflection;
+
+final class AtMostModifier implements SelectorInterface
+{
+    private int $max;
+    private array $selectors;
+
+    public function __construct(int $max, SelectorInterface ...$selector)
+    {
+        $this->max = $max;
+        $this->selectors = array_values($selector);
+    }
+
+    public function matches(ClassReflection $classReflection): bool
+    {
+        $matches = 0;
+
+        foreach ($this->selectors as $selector) {
+            if ($selector->matches($classReflection)) {
+                ++$matches;
+            }
+        }
+
+        return $matches <= $this->max;
+    }
+
+    public function getName(): string
+    {
+        return 'at-most-'.$this->max.'-of: '.implode(
+            ', ',
+            array_map(static fn (SelectorInterface $selector) => $selector->getName(), $this->selectors),
+        );
+    }
+}

src/Selector/Selector.php

@@ -3,6 +3,7 @@
 namespace PHPat\Selector;
 
 use PHPat\Selector\Modifier\AndModifier;
+use PHPat\Selector\Modifier\AtMostModifier;
 use PHPat\Selector\Modifier\NotModifier;
 
 final class Selector extends SelectorPrimitive
@@ -16,4 +17,9 @@ public static function NOT(SelectorInterface $selector): NotModifier
     {
         return new NotModifier($selector);
     }
+
+    public static function MAX(int $max, SelectorInterface ...$selector): AtMostModifier
+    {
+        return new AtMostModifier($max, ...$selector);
+    }
 }