merged branch unkind/bugfix-yaml-parse-exception (PR #8897)

This PR was merged into the 2.2 branch.

Discussion
----------

[Yaml] Fixed filename in the ParseException message

| Q             | A
| ------------- | ---
| Bug fix?      | sort of
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | —
| License       | MIT
| Doc PR        | —

Yaml component throws an exception with corrupt filename because of `json_encode`:

```
[Symfony\Component\Yaml\Exception\ParseException]
A YAML file cannot contain tabs as indentation in "\/var\/www\/app\/config.yml" at line 42 (near "	foo: bar").
```

Commits
-------

da44651 [Yaml] Fixed filename in the ParseException message

src/Symfony/Component/Yaml/Exception/ParseException.php

@@ -125,7 +125,7 @@ private function updateRepr()
         }
 
         if (null !== $this->parsedFile) {
-            $this->message .= sprintf(' in %s', json_encode($this->parsedFile));
+            $this->message .= sprintf(' in "%s"', $this->parsedFile);
         }
 
         if ($this->parsedLine >= 0) {

src/Symfony/Component/Yaml/Tests/ParseExceptionTest.php

@@ -0,0 +1,30 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Yaml\Tests;
+
+use Symfony\Component\Yaml\Exception\ParseException;
+use Symfony\Component\Yaml\Yaml;
+
+class ParseExceptionTest extends \PHPUnit_Framework_TestCase
+{
+    public function testGetMessage()
+    {
+        $exception = new ParseException(
+            'Error message', 42, 'foo: bar', '/var/www/app/config.yml'
+        );
+
+        $this->assertEquals(
+            'Error message in "/var/www/app/config.yml" at line 42 (near "foo: bar")',
+            $exception->getMessage()
+        );
+    }
+}