Interfaces can have properties hooks

src/PhpGenerator/InterfaceType.php

@@ -19,6 +19,7 @@ final class InterfaceType extends ClassLike
 {
 	use Traits\ConstantsAware;
 	use Traits\MethodsAware;
+	use Traits\PropertiesAware;
 
 	/** @var string[] */
 	private array $extends = [];
@@ -54,12 +55,13 @@ public function addExtend(string $name): static
 	/**
 	 * Adds a member. If it already exists, throws an exception or overwrites it if $overwrite is true.
 	 */
-	public function addMember(Method|Constant $member, bool $overwrite = false): static
+	public function addMember(Method|Constant|Property $member, bool $overwrite = false): static
 	{
 		$name = $member->getName();
 		[$type, $n] = match (true) {
 			$member instanceof Constant => ['consts', $name],
 			$member instanceof Method => ['methods', strtolower($name)],
+			$member instanceof Property => ['properties', $name],
 		};
 		if (!$overwrite && isset($this->$type[$n])) {
 			throw new Nette\InvalidStateException("Cannot add member '$name', because it already exists.");
@@ -75,5 +77,6 @@ public function __clone(): void
 		$clone = fn($item) => clone $item;
 		$this->consts = array_map($clone, $this->consts);
 		$this->methods = array_map($clone, $this->methods);
+		$this->properties = array_map($clone, $this->properties);
 	}
 }

src/PhpGenerator/Printer.php

@@ -198,9 +198,11 @@ public function printClass(
 		}
 
 		$properties = [];
-		if ($class instanceof ClassType || $class instanceof TraitType) {
+		if ($class instanceof ClassType || $class instanceof TraitType || $class instanceof InterfaceType) {
 			foreach ($class->getProperties() as $property) {
-				$properties[] = $this->printProperty($property, $readOnlyClass);
+				if (!$class instanceof InterfaceType || ($property->hasGetHook() || $property->hasSetHook())) {
+					$properties[] = $this->printProperty($property, $readOnlyClass, $class->isInterface());
+				}
 			}
 		}
 
@@ -375,7 +377,7 @@ private function printConstant(Constant $const): string
 	}
 
 
-	private function printProperty(Property $property, bool $readOnlyClass = false): string
+	private function printProperty(Property $property, bool $readOnlyClass = false, bool $isInterface = false): string
 	{
 		$property->validate();
 		$type = $property->getType();
@@ -386,11 +388,15 @@ private function printProperty(Property $property, bool $readOnlyClass = false):
 			. ltrim($this->printType($type, $property->isNullable()) . ' ')
 			. '$' . $property->getName());
 
-		$hooks = !$property->getSetHook() && !$property->getGetHook()
-			? ';'
-			: " {\n" . $this->printHooks($property) . '}';
+		if (!$property->getSetHook() && !$property->getGetHook()) {
+			$hooks = ';';
+		} elseif ($isInterface) {
+			$hooks = ' { ' . implode(' ', array_filter([$property->getSetHook() ? 'set;' : null, $property->getGetHook() ? 'get;' : null])) . ' }';
+		} else {
+			$hooks = " {\n" . $this->printHooks($property) . '}';
+		}
 
-		$defaultValue = $property->getValue() === null && !$property->isInitialized()
+		$defaultValue = $isInterface || ($property->getValue() === null && !$property->isInitialized())
 			? ''
 			: ' = ' . $this->dump($property->getValue(), strlen($def) + 3); // 3 = ' = '
 

tests/PhpGenerator/Property.hooks.interfaces.phpt

@@ -0,0 +1,48 @@
+<?php
+
+/**
+ * Test: Nette\PhpGenerator - PHP 8.4 property hooks for interfaces
+ */
+
+declare(strict_types=1);
+
+use Nette\PhpGenerator\InterfaceType;
+use Nette\PhpGenerator\PhpFile;
+use Nette\PhpGenerator\PropertyHook;
+use Nette\PhpGenerator\PsrPrinter;
+use Nette\PhpGenerator\Type;
+
+require __DIR__ . '/../bootstrap.php';
+
+$file = new PhpFile;
+$file->setStrictTypes();
+
+$namespace = $file->addNamespace('Abc');
+
+$interface = new InterfaceType('HasAuthor');
+
+// This will not be printed because it does not have any hooks
+$interface->addProperty('isVisible')
+	->setType(Type::Bool)
+	->setPublic();
+
+$interface->addProperty('score')
+	->setType(Type::Int)
+	->setPublic()
+	->setGetHook(new PropertyHook);
+
+$interface->addProperty('author')
+	->setType('Author')
+	->setPublic()
+	->setGetHook(new PropertyHook)
+	->setSetHook(new PropertyHook);
+
+$expected = <<<'PHP'
+	interface HasAuthor
+	{
+	    public int $score { get; }
+	    public Author $author { set; get; }
+	}
+	PHP;
+
+same(rtrim($expected), rtrim((new PsrPrinter)->printClass($interface)));