Implement TextAlign and all hooks necessary, but it's kind of useless since CSS validation hasn't been built yet.

git-svn-id: http://htmlpurifier.org/svnroot/htmlpurifier/trunk@166 48356398-32a2-884e-a903-53898d9a118a

library/HTMLPurifier/AttrTransform/TextAlign.php

@@ -0,0 +1,33 @@
+<?php
+
+require_once 'HTMLPurifier/AttrTransform.php';
+
+class HTMLPurifier_AttrTransform_TextAlign
+    extends HTMLPurifier_AttrTransform {
+
+    function transform($attr) {
+        
+        if (!isset($attr['align'])) return $attr;
+        
+        $align = strtolower(trim($attr['align']));
+        unset($attr['align']);
+        
+        $values = array('left' => 1,
+                        'right' => 1,
+                        'center' => 1,
+                        'justify' => 1);
+        
+        if (!isset($values[$align])) {
+            return $attr;
+        }
+        
+        $attr['style'] = isset($attr['style']) ? $attr['style'] : '';
+        $attr['style'] = "text-align:$align;" . $attr['style'];
+        
+        return $attr;
+        
+    }
+    
+}
+
+?>