[1.5.0] AttrDef partitioned into HTML, CSS and URI segments. Also, some minor bugs with MultiLength fixed.

git-svn-id: http://htmlpurifier.org/svnroot/htmlpurifier/trunk@747 48356398-32a2-884e-a903-53898d9a118a

library/HTMLPurifier/AttrDef/HTML/Nmtokens.php

@@ -0,0 +1,51 @@
+<?php
+
+require_once 'HTMLPurifier/AttrDef.php';
+require_once 'HTMLPurifier/Config.php';
+
+/**
+ * Validates contents based on NMTOKENS attribute type.
+ * @note The only current use for this is the class attribute in HTML
+ * @note Could have some functionality factored out into Nmtoken class
+ * @warning We cannot assume this class will be used only for 'class'
+ *          attributes. Not sure how to hook in magic behavior, then.
+ */
+class HTMLPurifier_AttrDef_HTML_Nmtokens extends HTMLPurifier_AttrDef
+{
+    
+    function validate($string, $config, &$context) {
+        
+        $string = trim($string);
+        
+        // early abort: '' and '0' (strings that convert to false) are invalid
+        if (!$string) return false;
+        
+        // OPTIMIZABLE!
+        // do the preg_match, capture all subpatterns for reformulation
+        
+        // we don't support U+00A1 and up codepoints or
+        // escaping because I don't know how to do that with regexps
+        // and plus it would complicate optimization efforts (you never
+        // see that anyway).
+        $matches = array();
+        $pattern = '/(?:(?<=\s)|\A)'. // look behind for space or string start
+                   '((?:--|-?[A-Za-z_])[A-Za-z_\-0-9]*)'.
+                   '(?:(?=\s)|\z)/'; // look ahead for space or string end
+        preg_match_all($pattern, $string, $matches);
+        
+        if (empty($matches[1])) return false;
+        
+        // reconstruct string
+        $new_string = '';
+        foreach ($matches[1] as $token) {
+            $new_string .= $token . ' ';
+        }
+        $new_string = rtrim($new_string);
+        
+        return $new_string;
+        
+    }
+    
+}
+
+?>