feature #18466 [Bridge][Twig] Optionally pass dumper into DumpExtension (CarsonF)

This PR was merged into the 3.2-dev branch.

Discussion
----------

[Bridge][Twig] Optionally pass dumper into DumpExtension

| Q             | A
| ------------- | ---
| Branch?       | master
| Bug fix?      | no
| New feature?  | yes
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| License       | MIT

Allow the dumper to be passed into `DumpExtension` constructor. This allows a different dumper to be used or even just `HtmlDumper` with a non-default configuration, such as different styles.

Note: The dumper's output is ignored.

Commits
-------

d8c0f1d [Bridge][Twig] Optionally pass dumper into DumpExtension

src/Symfony/Bridge/Twig/Extension/DumpExtension.php

@@ -23,10 +23,12 @@ use Symfony\Component\VarDumper\Dumper\HtmlDumper;
 class DumpExtension extends \Twig_Extension
 {
     private $cloner;
+    private $dumper;
 
-    public function __construct(ClonerInterface $cloner)
+    public function __construct(ClonerInterface $cloner, HtmlDumper $dumper = null)
     {
         $this->cloner = $cloner;
+        $this->dumper = $dumper ?: new HtmlDumper();
     }
 
     public function getFunctions()
@@ -67,11 +69,14 @@ class DumpExtension extends \Twig_Extension
         }
 
         $dump = fopen('php://memory', 'r+b');
-        $dumper = new HtmlDumper($dump);
+        $prevOutput = $this->dumper->setOutput($dump);
 
         foreach ($vars as $value) {
-            $dumper->dump($this->cloner->cloneVar($value));
+            $this->dumper->dump($this->cloner->cloneVar($value));
         }
+
+        $this->dumper->setOutput($prevOutput);
+
         rewind($dump);
 
         return stream_get_contents($dump);

src/Symfony/Bridge/Twig/Tests/Extension/DumpExtensionTest.php

@@ -12,6 +12,7 @@
 namespace Symfony\Bridge\Twig\Tests\Extension;
 
 use Symfony\Bridge\Twig\Extension\DumpExtension;
+use Symfony\Component\VarDumper\Dumper\HtmlDumper;
 use Symfony\Component\VarDumper\VarDumper;
 use Symfony\Component\VarDumper\Cloner\VarCloner;
 
@@ -103,4 +104,39 @@ class DumpExtensionTest extends \PHPUnit_Framework_TestCase
             ),
         );
     }
+
+    public function testCustomDumper()
+    {
+        $output = '';
+        $lineDumper = function ($line) use (&$output) {
+            $output .= $line;
+        };
+
+        $dumper = new HtmlDumper($lineDumper);
+
+        $dumper->setDumpHeader('');
+        $dumper->setDumpBoundaries(
+            '<pre class=sf-dump-test id=%s data-indent-pad="%s">',
+            '</pre><script>Sfdump("%s")</script>'
+        );
+        $extension = new DumpExtension(new VarCloner(), $dumper);
+        $twig = new \Twig_Environment($this->getMock('Twig_LoaderInterface'), array(
+            'debug' => true,
+            'cache' => false,
+            'optimizations' => 0,
+        ));
+
+        $dump = $extension->dump($twig, array(), 'foo');
+        $dump = preg_replace('/sf-dump-\d+/', 'sf-dump', $dump);
+
+        $this->assertEquals(
+            '<pre class=sf-dump-test id=sf-dump data-indent-pad="  ">"'.
+            "<span class=sf-dump-str title=\"3 characters\">foo</span>\"\n".
+            "</pre><script>Sfdump(\"sf-dump\")</script>\n",
+            $dump,
+            'Custom dumper should be used to dump data.'
+        );
+
+        $this->assertEmpty($output, 'Dumper output should be ignored.');
+    }
 }