Add decorator infrastructure for plugins

src/Dompdf.php

@@ -67,7 +67,7 @@
  *
  * @package dompdf
  */
-class Dompdf
+class Dompdf implements DompdfInterface
 {
     /**
      * Version string for dompdf
@@ -1484,6 +1484,14 @@ public function getFontMetrics()
         return $this->fontMetrics;
     }
 
+    /**
+     * @return FontMetrics
+     */
+    public function copy()
+    {
+        return new static($this->getOptions());
+    }
+
     /**
      * PHP5 overloaded getter
      * Along with {@link Dompdf::__set()} __get() provides access to all

src/DompdfDecorator.php

@@ -0,0 +1,46 @@
+<?php
+/**
+ * @package dompdf
+ * @link    http://dompdf.github.com/
+ * @author  Benj Carson <benjcarson@digitaljunkies.ca>
+ * @license http://www.gnu.org/copyleft/lesser.html GNU Lesser General Public License
+ */
+namespace Dompdf;
+
+abstract class DompdfDecorator implements DompdfInterface
+{
+    /**
+     * @var DompdfInterface
+     */
+    protected $pdf;
+
+    public function __construct( DompdfInterface $pdf ) {
+        $this->pdf = $pdf;
+    }
+
+    public function getOptions() {
+        return $this->pdf->getOptions();
+    }
+
+    public function getDom() {
+        return $this->pdf->getDom();
+    }
+
+    public function render() {
+        $this->pdf->render();
+    }
+
+    public function output( $options = null ) {
+        return $this->pdf->output($options);
+    }
+
+    public function loadHtml( $html, $encoding = 'UTF-8' ) {
+        $this->pdf->loadHtml($html, $encoding);
+    }
+
+    public function copy() {
+        $this->pdf = $this->pdf->copy();
+        return $this;
+    }
+
+}

src/DompdfInterface.php

@@ -0,0 +1,44 @@
+<?php
+/**
+ * @package dompdf
+ * @link    http://dompdf.github.com/
+ * @author  Benj Carson <benjcarson@digitaljunkies.ca>
+ * @license http://www.gnu.org/copyleft/lesser.html GNU Lesser General Public License
+ */
+namespace Dompdf;
+
+use DOMDocument;
+
+interface DompdfInterface
+{
+    /**
+     * @return Options
+     */
+    public function getOptions();
+
+    /**
+     * @return DOMDocument
+     */
+    public function getDom();
+
+    /**
+     * @return void
+     */
+    public function render();
+
+    /**
+     * @return string
+     */
+    public function output( $options = null );
+
+    /**
+     * @return void
+     */
+    public function loadHtml( $str, $encoding = 'UTF-8' );
+
+    /**
+     * @return DompdfInterface
+     */
+    public function copy();
+
+}