support for BackedEnum

Author: fdreamsu

src/Validator/BackedEnum.php

@@ -0,0 +1,29 @@
+<?php
+namespace Swango\HttpServer\Validator;
+class BackedEnum extends \Swango\HttpServer\Validator {
+    public function __construct($cnkey, protected string $enum_class) {
+        parent::__construct($cnkey);
+    }
+    public function getCnMsg(): string {
+        if (isset($this->cnmsg)) {
+            return $this->cnmsg;
+        }
+        $enum = [];
+        foreach (($this->enum_class)::cases() as $case)
+            $enum[] = $case->value;
+        $ret = $this->cnkey . '必须为(' . implode(',', $enum) . ')中的一项';
+        if (! $this->isOptional() || ! $this->couldBeNull()) {
+            $ret .= '且不可缺省';
+        }
+        return $ret;
+    }
+    protected function check(?string $key, &$value): void {
+        if (is_array($value) || is_object($value)) {
+            throw new \ExceptionToResponse\InvalidParameterException('Invalid ' . $key, $this->getCnMsg());
+        }
+        $value = ($this->enum_class)::tryFrom($value);
+        if (! isset($value)) {
+            throw new \ExceptionToResponse\InvalidParameterException('Invalid ' . $key, $this->getCnMsg());
+        }
+    }
+}

src/Validator/Enum.php

@@ -1,16 +1,21 @@
 <?php
 namespace Swango\HttpServer\Validator;
 class Enum extends \Swango\HttpServer\Validator {
-    private $enum, $all_string;
+    private array $enum;
+    private bool $all_string;
     public function __construct($cnkey, array $enum) {
         parent::__construct($cnkey);
         $this->enum = $enum;
         $this->all_string = true;
-        foreach ($enum as $item)
+        foreach ($enum as $item) {
+            if ($item instanceof \BackedEnum) {
+                $item = $item->value;
+            }
             if (! is_string($item) && ! is_numeric($item)) {
                 $this->all_string = false;
                 break;
             }
+        }
     }
     public function getCnMsg(): string {
         if (isset($this->cnmsg))