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-rw-r--r--library/HTMLPurifier/AttrDef/CSS/AlphaValue.php21
1 files changed, 21 insertions, 0 deletions
diff --git a/library/HTMLPurifier/AttrDef/CSS/AlphaValue.php b/library/HTMLPurifier/AttrDef/CSS/AlphaValue.php
new file mode 100644
index 000000000..292c040d4
--- /dev/null
+++ b/library/HTMLPurifier/AttrDef/CSS/AlphaValue.php
@@ -0,0 +1,21 @@
+<?php
+
+class HTMLPurifier_AttrDef_CSS_AlphaValue extends HTMLPurifier_AttrDef_CSS_Number
+{
+
+ public function __construct() {
+ parent::__construct(false); // opacity is non-negative, but we will clamp it
+ }
+
+ public function validate($number, $config, $context) {
+ $result = parent::validate($number, $config, $context);
+ if ($result === false) return $result;
+ $float = (float) $result;
+ if ($float < 0.0) $result = '0';
+ if ($float > 1.0) $result = '1';
+ return $result;
+ }
+
+}
+
+// vim: et sw=4 sts=4