Container: shows suggestions for missing components

composer.json

@@ -15,7 +15,7 @@
 	],
 	"require": {
 		"php": ">=5.3.1",
-		"nette/utils": "~2.2"
+		"nette/utils": "^2.3.5"
 	},
 	"require-dev": {
 		"nette/tester": "~1.3"

src/ComponentModel/Container.php

@@ -159,7 +159,11 @@ public function getComponent($name, $need = TRUE)
 			}
 
 		} elseif ($need) {
-			throw new Nette\InvalidArgumentException("Component with name '$name' does not exist.");
+			$hint = Nette\Utils\ObjectMixin::getSuggestion(array_merge(
+				array_keys($this->components),
+				array_map('lcfirst', preg_filter('#^createComponent([A-Z0-9].*)#', '$1', get_class_methods($this)))
+			), $name);
+			throw new Nette\InvalidArgumentException("Component with name '$name' does not exist" . ($hint ? ", did you mean '$hint'?" : '.'));
 		}
 	}
 

tests/ComponentModel/Container.factory.addComponent.phpt

@@ -28,4 +28,4 @@ Assert::same('b', $a->getComponent('b')->getName());
 
 Assert::exception(function () use ($a) {
 	$a->getComponent('B')->getName();
-}, 'InvalidArgumentException', "Component with name 'B' does not exist.");
+}, 'InvalidArgumentException', "Component with name 'B' does not exist, did you mean 'b'?");

tests/ComponentModel/Container.factory.addComponentWithreturn.phpt

@@ -29,4 +29,4 @@ Assert::same('b', $a->getComponent('b')->getName());
 
 Assert::exception(function () use ($a) {
 	$a->getComponent('B')->getName();
-}, 'InvalidArgumentException', "Component with name 'B' does not exist.");
+}, 'InvalidArgumentException', "Component with name 'B' does not exist, did you mean 'b'?");

tests/ComponentModel/Container.factory.return.phpt

@@ -31,7 +31,7 @@ Assert::count(1, $a->getComponents());
 
 Assert::exception(function () use ($a) {
 	$a->getComponent('B')->getName();
-}, 'InvalidArgumentException', "Component with name 'B' does not exist.");
+}, 'InvalidArgumentException', "Component with name 'B' does not exist, did you mean 'b'?");
 
 
 $a->removeComponent($b);

tests/ComponentModel/Container.suggestions.phpt

@@ -0,0 +1,57 @@
+<?php
+
+/**
+ * Test: Nette\ComponentModel\Container suggestions.
+ */
+
+use Nette\ComponentModel\Container;
+use Tester\Assert;
+
+
+require __DIR__ . '/../bootstrap.php';
+
+
+class TestContainer extends Container
+{
+
+	public function createComponentPublic()
+	{
+	}
+
+	public static function createComponentPublicStatic()
+	{
+	}
+
+	protected function createComponentProtected()
+	{
+	}
+
+	private function createComponentPrivate()
+	{
+	}
+
+}
+
+
+$cont = new TestContainer;
+$cont->addComponent(new TestContainer, 'form');
+
+Assert::exception(function () use ($cont) {
+	$comp = $cont->getComponent('from');
+}, 'Nette\InvalidArgumentException', "Component with name 'from' does not exist, did you mean 'form'?");
+
+Assert::exception(function () use ($cont) {
+	$comp = $cont->getComponent('Public');
+}, 'Nette\InvalidArgumentException', "Component with name 'Public' does not exist, did you mean 'public'?");
+
+Assert::exception(function () use ($cont) {
+	$comp = $cont->getComponent('PublicStatic');
+}, 'Nette\InvalidArgumentException', "Component with name 'PublicStatic' does not exist, did you mean 'publicStatic'?");
+
+Assert::exception(function () use ($cont) {
+	$comp = $cont->getComponent('Protected');
+}, 'Nette\InvalidArgumentException', "Component with name 'Protected' does not exist, did you mean 'protected'?");
+
+Assert::exception(function () use ($cont) { // suggest only non-private methods
+	$comp = $cont->getComponent('Private');
+}, 'Nette\InvalidArgumentException', "Component with name 'Private' does not exist.");