[VarDumper] Use Unicode Control Pictures

Author: nicolas-grekas

src/Symfony/Component/VarDumper/Cloner/AbstractCloner.php

@@ -84,7 +84,6 @@ abstract class AbstractCloner implements ClonerInterface
     protected $maxString = -1;
 
     private $casters = array();
-    private $data = array(array(null));
     private $prevErrorHandler;
     private $classInfo = array();
 

src/Symfony/Component/VarDumper/Dumper/CliDumper.php

@@ -331,7 +331,7 @@ protected function dumpKey(Cursor $cursor)
             }
 
             if ($cursor->hardRefTo) {
-                $this->line .= $this->style('ref', '&'.$cursor->hardRefTo, array('count' => $cursor->hardRefCount)).' ';
+                $this->line .= $this->style('ref', '&'.($cursor->hardRefCount ? $cursor->hardRefTo : ''), array('count' => $cursor->hardRefCount)).' ';
             }
         }
     }

src/Symfony/Component/VarDumper/Dumper/HtmlDumper.php

@@ -35,7 +35,7 @@ class HtmlDumper extends CliDumper
         'num' => 'font-weight:bold; color:#1299DA',
         'const' => 'font-weight:bold',
         'str' => 'font-weight:bold; color:#56DB3A',
-        'cchr' => 'font-style:italic',
+        'cchr' => 'color:#FF8400',
         'note' => 'color:#1299DA',
         'ref' => 'color:#A0A0A0',
         'public' => 'color:#FFFFFF',
@@ -319,7 +319,8 @@ protected function style($style, $value, $attr = array())
 
         $v = htmlspecialchars($value, ENT_QUOTES, 'UTF-8');
         $v = preg_replace_callback(self::$controlCharsRx, function ($r) {
-            return sprintf('<span class=sf-dump-cchr title=\\x%02X>%s</span>', ord($r[0]), "\x7F" === $r[0] ? '?' : chr(64 + ord($r[0])));
+            // Use Unicode Control Pictures - see http://www.unicode.org/charts/PDF/U2400.pdf
+            return sprintf('<span class=sf-dump-cchr title=\\x%02X>&#%d;</span>', ord($r[0]), "\x7F" !== $r[0] ? 0x2400 + ord($r[0]) : 0x2421);
         }, $v);
 
         if ('ref' === $style) {

src/Symfony/Component/VarDumper/Tests/HtmlDumperTest.php

@@ -62,7 +62,7 @@ public function testGet()
   <span class=sf-dump-key>5</span> => <span class=sf-dump-num>-INF</span>
   <span class=sf-dump-key>6</span> => <span class=sf-dump-num>{$intMax}</span>
   "<span class=sf-dump-key>str</span>" => "<span class=sf-dump-str title="4 characters">d&#233;j&#224;</span>"
-  <span class=sf-dump-key>7</span> => b"<span class=sf-dump-str title="2 binary or non-UTF-8 characters">&#233;<span class=sf-dump-cchr title=\\x00>@</span></span>"
+  <span class=sf-dump-key>7</span> => b"<span class=sf-dump-str title="2 binary or non-UTF-8 characters">&#233;<span class=sf-dump-cchr title=\\x00>&#9216;</span></span>"
   "<span class=sf-dump-key>[]</span>" => []
   "<span class=sf-dump-key>res</span>" => <abbr title="`stream` resource" class=sf-dump-note>:stream</abbr> {<a class=sf-dump-ref>@{$res1}</a><samp>
     <span class=sf-dump-meta>wrapper_type</span>: "<span class=sf-dump-str title="9 characters">plainfile</span>"