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-rw-r--r--library/HTMLPurifier/AttrDef/CSS/Number.php69
1 files changed, 69 insertions, 0 deletions
diff --git a/library/HTMLPurifier/AttrDef/CSS/Number.php b/library/HTMLPurifier/AttrDef/CSS/Number.php
new file mode 100644
index 000000000..3f99e12ec
--- /dev/null
+++ b/library/HTMLPurifier/AttrDef/CSS/Number.php
@@ -0,0 +1,69 @@
+<?php
+
+/**
+ * Validates a number as defined by the CSS spec.
+ */
+class HTMLPurifier_AttrDef_CSS_Number extends HTMLPurifier_AttrDef
+{
+
+ /**
+ * Bool indicating whether or not only positive values allowed.
+ */
+ protected $non_negative = false;
+
+ /**
+ * @param $non_negative Bool indicating whether negatives are forbidden
+ */
+ public function __construct($non_negative = false) {
+ $this->non_negative = $non_negative;
+ }
+
+ /**
+ * @warning Some contexts do not pass $config, $context. These
+ * variables should not be used without checking HTMLPurifier_Length
+ */
+ public function validate($number, $config, $context) {
+
+ $number = $this->parseCDATA($number);
+
+ if ($number === '') return false;
+ if ($number === '0') return '0';
+
+ $sign = '';
+ switch ($number[0]) {
+ case '-':
+ if ($this->non_negative) return false;
+ $sign = '-';
+ case '+':
+ $number = substr($number, 1);
+ }
+
+ if (ctype_digit($number)) {
+ $number = ltrim($number, '0');
+ return $number ? $sign . $number : '0';
+ }
+
+ // Period is the only non-numeric character allowed
+ if (strpos($number, '.') === false) return false;
+
+ list($left, $right) = explode('.', $number, 2);
+
+ if ($left === '' && $right === '') return false;
+ if ($left !== '' && !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;
+
+ }
+
+}
+
+// vim: et sw=4 sts=4