Implement lang and xml:lang. Fixed a bunch of bugs too.

git-svn-id: http://htmlpurifier.org/svnroot/htmlpurifier/trunk@162 48356398-32a2-884e-a903-53898d9a118a
2025-07-31 19:30:21 +02:00 · 2006-08-05 01:50:13 +00:00
parent 1945ddca5c
commit 8a23710405
11 changed files with 312 additions and 7 deletions
--- a/library/HTMLPurifier/AttrDef/Lang.php
+++ b/library/HTMLPurifier/AttrDef/Lang.php
@@ -0,0 +1,73 @@
+<?php
+
+require_once 'HTMLPurifier/AttrDef.php';
+
+// built according to RFC 3066, which obsoleted RFC 1766
+
+class HTMLPurifier_AttrDef_Lang extends HTMLPurifier_AttrDef
+{
+    
+    function validate($string) {
+        
+        $string = trim($string);
+        if (!$string) return false;
+        
+        $subtags = explode('-', $string);
+        $num_subtags = count($subtags);
+        
+        if ($num_subtags == 0) return false; // sanity check
+        
+        // process primary subtag : $subtags[0]
+        $length = strlen($subtags[0]);
+        switch ($length) {
+            case 0:
+                return false;
+            case 1:
+                if (! ($subtags[0] == 'x' || $subtags[0] == 'i') ) {
+                    return false;
+                }
+                break;
+            case 2:
+            case 3:
+                if (! ctype_alpha($subtags[0]) ) {
+                    return false;
+                } elseif (! ctype_lower($subtags[0]) ) {
+                    $subtags[0] = strtolower($subtags[0]);
+                }
+                break;
+            default:
+                return false;
+        }
+        
+        $new_string = $subtags[0];
+        if ($num_subtags == 1) return $new_string;
+        
+        // process second subtag : $subtags[1]
+        $length = strlen($subtags[1]);
+        if ($length == 0 || $length == 1 || $length > 8 || !ctype_alnum($subtags[1])) {
+            return $new_string;
+        }
+        if (!ctype_lower($subtags[1])) $subtags[1] = strotolower($subtags[1]);
+        
+        $new_string .= '-' . $subtags[1];
+        if ($num_subtags == 2) return $new_string;
+        
+        // process all other subtags, index 2 and up
+        for ($i = 2; $i < $num_subtags; $i++) {
+            $length = strlen($subtags[$i]);
+            if ($length == 0 || $length > 8 || !ctype_alnum($subtags[$i])) {
+                return $new_string;
+            }
+            if (!ctype_lower($subtags[$i])) {
+                $subtags[$i] = strotolower($subtags[$i]);
+            }
+            $new_string .= '-' . $subtags[$i];
+        }
+        
+        return $new_string;
+        
+    }
+    
+}
+
+?>