Improve exception message and add test

src/PhpGenerator/ClassLike.php

@@ -39,27 +39,28 @@ abstract class ClassLike
 
 	public static function from(string|object $class, bool $withBodies = false): static
 	{
-		$class = (new Factory)
+		$instance = (new Factory)
 			->fromClassReflection(new \ReflectionClass($class), $withBodies);
 
-        if (!$class instanceof static) {
-            throw new Nette\InvalidArgumentException("Object '$class' is not an instance of " . static::class);
+        if (!$instance instanceof static) {
+            $class = is_object($class) ? get_class($class) : $class;
+            throw new Nette\InvalidArgumentException("'$class' cannot be represented with " . static::class . ". Call " . get_class($instance) . "::" . __FUNCTION__ . "() or " . __METHOD__ . "() instead.");
         }
 
-        return $class;
+        return $instance;
 	}
 
 
 	public static function fromCode(string $code): static
 	{
-		$class = (new Factory)
+		$instance = (new Factory)
 			->fromClassCode($code);
 
-        if (!$class instanceof static) {
-            throw new Nette\InvalidArgumentException("Object '$class' is not an instance of " . static::class);
+        if (!$instance instanceof static) {
+            throw new Nette\InvalidArgumentException("Provided code cannot be represented with " . static::class . ". Call " . get_class($instance) . "::" . __FUNCTION__ . "() or " . __METHOD__ . "() instead.");
         }
 
-        return $class;
+        return $instance;
 	}
 
 

tests/PhpGenerator/ClassLike.typecheck.phpt

@@ -0,0 +1,28 @@
+<?php
+
+declare(strict_types=1);
+
+use Nette\PhpGenerator\ClassType;
+use Nette\PhpGenerator\EnumType;
+use Nette\PhpGenerator\InterfaceType;
+use Nette\PhpGenerator\TraitType;
+use Tester\Assert;
+
+require __DIR__ . '/../bootstrap.php';
+require __DIR__ . '/fixtures/classes.php';
+
+Assert::exception(function () {
+	ClassType::from(Abc\Interface1::class);
+}, Nette\InvalidArgumentException::class, "'Abc\\Interface1' cannot be represented with Nette\\PhpGenerator\\ClassType. Call Nette\\PhpGenerator\\InterfaceType::from() or Nette\\PhpGenerator\\ClassLike::from() instead.");
+
+Assert::exception(function () {
+    TraitType::from(Abc\Class1::class);
+}, Nette\InvalidArgumentException::class, "'Abc\\Class1' cannot be represented with Nette\\PhpGenerator\\TraitType. Call Nette\\PhpGenerator\\ClassType::from() or Nette\\PhpGenerator\\ClassLike::from() instead.");
+
+Assert::exception(function () {
+    ClassType::fromCode("<?php interface I {}");
+}, Nette\InvalidArgumentException::class, "Provided code cannot be represented with Nette\\PhpGenerator\\ClassType. Call Nette\\PhpGenerator\\InterfaceType::fromCode() or Nette\\PhpGenerator\\ClassLike::fromCode() instead.");
+
+Assert::exception(function () {
+    InterfaceType::fromCode("<?php trait T {}");
+}, Nette\InvalidArgumentException::class, "Provided code cannot be represented with Nette\\PhpGenerator\\InterfaceType. Call Nette\\PhpGenerator\\TraitType::fromCode() or Nette\\PhpGenerator\\ClassLike::fromCode() instead.");