Commit AttrDef number, currently used by no styles right now, but percentage and length will piggy-back off it.

git-svn-id: http://htmlpurifier.org/svnroot/htmlpurifier/trunk@236 48356398-32a2-884e-a903-53898d9a118a

library/HTMLPurifier/AttrDef/Number.php

@@ -0,0 +1,45 @@
+<?php
+
+class HTMLPurifier_AttrDef_Number extends HTMLPurifier_AttrDef
+{
+    
+    function validate($number, $config, &$context) {
+        
+        $number = $this->parseCDATA($number);
+        
+        if ($number === '') return false;
+        
+        $sign = '';
+        switch ($number[0]) {
+            case '-':
+                $sign = '-';
+            case '+':
+                $number = substr($number, 1);
+        }
+        
+        if (ctype_digit($number)) {
+            $number = ltrim($number, '0');
+            return $number ? $sign . $number : '0';
+        }
+        if (!strpos($number, '.')) return false;
+        
+        list($left, $right) = explode('.', $number, 2);
+        
+        if (!ctype_digit($left)) return false;
+        $left = ltrim($left, '0');
+        
+        $right = rtrim($right, '0');
+        
+        if ($right === '') {
+            return $left ? $sign . $left : '0';
+        } elseif (!ctype_digit($right)) {
+            return false;
+        }
+        
+        return $sign . $left . '.' . $right;
+        
+    }
+    
+}
+
+?>