merged branch GromNaN/2.3-di-dump-exception (PR #8524)

This PR was merged into the 2.3 branch.

Discussion
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[DependencyInjection][2.3] Add exception for service name not dumpable in PHP

Same as #8494 for branch 2.3 since the DI component has been refactored (bb797ee755, f1c2ab78af)

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #8485 #8030
| License       | MIT
| Doc PR        | n/a

Throws an exception when the DIC is dumped to PHP, before generating invalid PHP.
The regex comes from the PHP doc: http://www.php.net/manual/en/language.oop5.basic.php

Commits
-------

9ac3556 [DependencyInjection] Add exception for service name not dumpable in PHP

src/Symfony/Component/DependencyInjection/Dumper/PhpDumper.php

@@ -490,7 +490,6 @@ class PhpDumper extends Dumper
      */
     private function addService($id, $definition)
     {
-        $name = Container::camelize($id);
         $this->definitionVariables = new \SplObjectStorage();
         $this->referenceVariables = array();
         $this->variableCount = 0;
@@ -555,7 +554,7 @@ EOF;
      *$lazyInitializationDoc
      * $return
      */
-    {$visibility} function get{$name}Service($lazyInitialization)
+    {$visibility} function get{$this->camelize($id)}Service($lazyInitialization)
     {
 
 EOF;
@@ -656,14 +655,12 @@ EOF;
             return;
         }
 
-        $name = Container::camelize($id);
-
         return <<<EOF
 
     /**
      * Updates the '$id' service.
      */
-    protected function synchronize{$name}Service()
+    protected function synchronize{$this->camelize($id)}Service()
     {
 $code    }
 
@@ -835,7 +832,7 @@ EOF;
         $code = "        \$this->methodMap = array(\n";
         ksort($definitions);
         foreach ($definitions as $id => $definition) {
-            $code .= '            '.var_export($id, true).' => '.var_export('get'.Container::camelize($id).'Service', true).",\n";
+            $code .= '            '.var_export($id, true).' => '.var_export('get'.$this->camelize($id).'Service', true).",\n";
         }
 
         return $code . "        );\n";
@@ -1260,6 +1257,26 @@ EOF;
         }
     }
 
+    /**
+     * Convert a service id to a valid PHP method name.
+     *
+     * @param string $id
+     *
+     * @return string
+     *
+     * @throws InvalidArgumentException
+     */
+    private function camelize($id)
+    {
+        $name = Container::camelize($id);
+
+        if (!preg_match('/^[a-zA-Z0-9_\x7f-\xff]+$/', $name)) {
+            throw new InvalidArgumentException(sprintf('Service id "%s" cannot be converted to a valid PHP method name.', $id));
+        }
+
+        return $name;
+    }
+
     /**
      * Returns the next name to use
      *

src/Symfony/Component/DependencyInjection/Tests/Dumper/PhpDumperTest.php

@@ -120,6 +120,18 @@ class PhpDumperTest extends \PHPUnit_Framework_TestCase
         }
     }
 
+    /**
+     * @expectedException InvalidArgumentException
+     * @expectedExceptionMessage Service id "bar$" cannot be converted to a valid PHP method name.
+     */
+    public function testAddServiceInvalidServiceId()
+    {
+        $container = new ContainerBuilder();
+        $container->register('bar$', 'FooClass');
+        $dumper = new PhpDumper($container);
+        $dumper->dump();
+    }
+
     public function testAliases()
     {
         $container = include self::$fixturesPath.'/containers/container9.php';