暂存

vendor/illuminate/support/Traits/ReadsClassAttributes.php

@@ -0,0 +1,74 @@
+<?php
+
+namespace Illuminate\Support\Traits;
+
+use Exception;
+use ReflectionClass;
+
+trait ReadsClassAttributes
+{
+    /**
+     * Get a configuration value from an attribute, falling back to a property.
+     *
+     * @param  object  $target
+     * @param  class-string  $attributeClass
+     * @param  string|null  $property
+     * @param  mixed  $default
+     * @return mixed
+     */
+    protected function getAttributeValue($target, string $attributeClass, ?string $property = null, $default = null)
+    {
+        $reflection = new ReflectionClass($target);
+
+        $defaultProperties = $reflection->getDefaultProperties();
+
+        if (isset($target->{$property}) && $target->{$property} !== ($defaultProperties[$property] ?? null)) {
+            return $target->{$property};
+        }
+
+        if ($instance = $this->getAttributeInstance($target, $attributeClass)) {
+            return $this->extractAttributeValue($instance);
+        }
+
+        return $target->{$property} ?? $default;
+    }
+
+    /**
+     * Extract the value from an attribute instance.
+     *
+     * @param  object  $instance
+     * @return mixed
+     */
+    protected function extractAttributeValue($instance)
+    {
+        $properties = get_object_vars($instance);
+
+        return $properties === [] ? true : reset($properties);
+    }
+
+    /**
+     * Get an instance of the given attribute class from the target class or its parents.
+     *
+     * @param  object  $target
+     * @param  class-string  $attributeClass
+     * @return object|null
+     */
+    protected function getAttributeInstance($target, string $attributeClass)
+    {
+        $reflection = new ReflectionClass($target);
+
+        try {
+            do {
+                $attributes = $reflection->getAttributes($attributeClass);
+
+                if (count($attributes) > 0) {
+                    return $attributes[0]->newInstance();
+                }
+            } while ($reflection = $reflection->getParentClass());
+        } catch (Exception) {
+            //
+        }
+
+        return null;
+    }
+}