Add dedicated exception

Author: dantleech

lib/Resolver.php

@@ -118,11 +118,7 @@ public function resolve(array $config): array
 
         if ($diff = array_diff(array_keys($config), $allowedKeys)) {
             $this->throwOrLogError(
-                new InvalidMap(sprintf(
-                    'Key(s) "%s" are not known, known keys: "%s"',
-                    implode('", "', ($diff)),
-                    implode('", "', $allowedKeys)
-                ))
+                UnknownKeys::fromKeysAndAllowedKeys(array_values($diff), $allowedKeys)
             );
 
             $config = $this->removeKeys($config, $diff);
@@ -227,12 +223,12 @@ public function errors(): ResolverErrors
     }
 
     /**
-     * @return array<string>
+     * @return list<string>
      */
     private function resolveAllowedKeys(): array
     {
         $allowedKeys = array_merge(array_keys($this->defaults), $this->required);
-        return $allowedKeys;
+        return array_values($allowedKeys);
     }
 
     private function throwOrLogError(InvalidMap $error): void

lib/UnknownKeys.php

@@ -0,0 +1,45 @@
+<?php
+
+namespace Phpactor\MapResolver;
+
+
+class UnknownKeys extends InvalidMap
+{
+    /**
+     * @param list<string> $allowedKeys
+     * @param list<string> $keys
+     */
+    public function __construct(string $message, private array $keys, private array $allowedKeys)
+    {
+        parent::__construct($message);
+    }
+
+    /**
+     * @return list<string>
+     */
+    public function additionalKeys(): array
+    {
+        return $this->keys;
+    }
+
+    /**
+     * @return list<string>
+     */
+    public function allowedKeys(): array
+    {
+        return $this->allowedKeys;
+    }
+
+    /**
+     * @param list<string> $allowedKeys
+     * @param list<string> $diff
+     */
+    public static function fromKeysAndAllowedKeys(array $diff, array $allowedKeys): self
+    {
+        return new self(sprintf(
+            'Key(s) "%s" are not known, known keys: "%s"',
+            implode('", "', ($diff)),
+            implode('", "', $allowedKeys),
+        ), $diff, $allowedKeys);
+    }
+}