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