[1.2.0] Implement primitive email regexp to be used for mailto. There are many spotty implementation issues, so this code is not actually called anywhere else currently.

git-svn-id: http://htmlpurifier.org/svnroot/htmlpurifier/trunk@517 48356398-32a2-884e-a903-53898d9a118a

library/HTMLPurifier/AttrDef.php

@@ -20,10 +20,7 @@ class HTMLPurifier_AttrDef
     var $minimized = false;
     
     /**
-     * Abstract function defined for functions that validate and clean strings.
-     * 
-     * This function forms the basis for all the subclasses: they must
-     * define this method.
+     * Validates and cleans passed string according to a definition.
      * 
      * @public
      * @param $string String to be validated and cleaned.

library/HTMLPurifier/AttrDef/Email.php

@@ -0,0 +1,17 @@
+<?php
+
+require_once 'HTMLPurifier/AttrDef.php';
+
+class HTMLPurifier_AttrDef_Email extends HTMLPurifier_AttrDef
+{
+    
+    /**
+     * Unpacks a mailbox into its display-name and address
+     */
+    function unpack($string) {
+        // needs to be implemented
+    }
+    
+}
+
+?>

library/HTMLPurifier/AttrDef/Email/SimpleCheck.php

@@ -0,0 +1,23 @@
+<?php
+
+require_once 'HTMLPurifier/AttrDef/Email.php';
+
+/**
+ * Primitive email validation class based on the regexp found at 
+ * http://www.regular-expressions.info/email.html
+ */
+class HTMLPurifier_AttrDef_Email_SimpleCheck extends HTMLPurifier_AttrDef_Email
+{
+    
+    function validate($string, $config, &$context) {
+        // no support for named mailboxes i.e. "Bob <bob@example.com>"
+        // that needs more percent encoding to be done
+        if ($string == '') return false;
+        $string = trim($string);
+        $result = preg_match('/^[A-Z0-9._%-]+@[A-Z0-9.-]+\.[A-Z]{2,4}$/i', $string);
+        return $result ? $string : false;
+    }
+    
+}
+
+?>