[console] Removed hardcoded empty style from styles stack.

Author: jfsimon

src/Symfony/Component/Console/Formatter/OutputFormatterStyleStack.php

@@ -17,15 +17,23 @@
 class OutputFormatterStyleStack
 {
     /**
-     * @var OutputFormatterStyle[]
+     * @var OutputFormatterStyleInterface[]
      */
     private $styles;
 
+    /**
+     * @var OutputFormatterStyleInterface
+     */
+    private $emptyStyle;
+
     /**
      * Constructor.
+     *
+     * @param \Symfony\Component\Console\Formatter\OutputFormatterStyleInterface $emptyStyle
      */
-    public function __construct()
+    public function __construct(OutputFormatterStyleInterface $emptyStyle = null)
     {
+        $this->emptyStyle = $emptyStyle ?: new OutputFormatterStyle();
         $this->reset();
     }
 
@@ -59,7 +67,7 @@ public function push(OutputFormatterStyleInterface $style)
     public function pop(OutputFormatterStyleInterface $style = null)
     {
         if (empty($this->styles)) {
-            return new OutputFormatterStyle();
+            return $this->emptyStyle;
         }
 
         if (null === $style) {
@@ -85,9 +93,29 @@ public function pop(OutputFormatterStyleInterface $style = null)
     public function getCurrent()
     {
         if (empty($this->styles)) {
-            return new OutputFormatterStyle();
+            return $this->emptyStyle;
         }
 
         return $this->styles[count($this->styles)-1];
     }
+
+    /**
+     * @param \Symfony\Component\Console\Formatter\OutputFormatterStyleInterface $emptyStyle
+     *
+     * @return \Symfony\Component\Console\Formatter\OutputFormatterStyleStack
+     */
+    public function setEmptyStyle(OutputFormatterStyleInterface $emptyStyle)
+    {
+        $this->emptyStyle = $emptyStyle;
+
+        return $this;
+    }
+
+    /**
+     * @return \Symfony\Component\Console\Formatter\OutputFormatterStyleInterface
+     */
+    public function getEmptyStyle()
+    {
+        return $this->emptyStyle;
+    }
 }