Add conversion functions for our own tree format.

Signed-off-by: Edward Z. Yang <ezyang@mit.edu>

library/HTMLPurifier/Token/Comment.php

@@ -29,6 +29,10 @@ class HTMLPurifier_Token_Comment extends HTMLPurifier_Token
         $this->line = $line;
         $this->col = $col;
     }
+
+    public function toNode() {
+        return new HTMLPurifier_Node_Comment($this->data, $this->line, $this->col);
+    }
 }
 
 // vim: et sw=4 sts=4

library/HTMLPurifier/Token/Empty.php

@@ -5,6 +5,11 @@
  */
 class HTMLPurifier_Token_Empty extends HTMLPurifier_Token_Tag
 {
+    public function toNode() {
+        $n = parent::toNode();
+        $n->empty = true;
+        return $n;
+    }
 }
 
 // vim: et sw=4 sts=4

library/HTMLPurifier/Token/End.php

@@ -15,6 +15,10 @@ class HTMLPurifier_Token_End extends HTMLPurifier_Token_Tag
      * @type HTMLPurifier_Token
      */
     public $start;
+
+    public function toNode() {
+        throw new Exception("HTMLPurifier_Token_End->toNode not supported!");
+    }
 }
 
 // vim: et sw=4 sts=4

library/HTMLPurifier/Token/Tag.php

@@ -59,6 +59,10 @@ abstract class HTMLPurifier_Token_Tag extends HTMLPurifier_Token
         $this->col = $col;
         $this->armor = $armor;
     }
+
+    public function toNode() {
+        return new HTMLPurifier_Node_Element($this->name, $this->attr, $this->line, $this->col, $this->armor);
+    }
 }
 
 // vim: et sw=4 sts=4

library/HTMLPurifier/Token/Text.php

@@ -44,6 +44,10 @@ class HTMLPurifier_Token_Text extends HTMLPurifier_Token
         $this->line = $line;
         $this->col = $col;
     }
+
+    public function toNode() {
+        return new HTMLPurifier_Node_Text($this->data, $this->is_whitespace, $this->line, $this->col);
+    }
 }
 
 // vim: et sw=4 sts=4