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-rw-r--r--library/HTMLPurifier/AttrDef/CSS/Ident.php32
1 files changed, 32 insertions, 0 deletions
diff --git a/library/HTMLPurifier/AttrDef/CSS/Ident.php b/library/HTMLPurifier/AttrDef/CSS/Ident.php
new file mode 100644
index 000000000..973002c17
--- /dev/null
+++ b/library/HTMLPurifier/AttrDef/CSS/Ident.php
@@ -0,0 +1,32 @@
+<?php
+
+/**
+ * Validates based on {ident} CSS grammar production
+ */
+class HTMLPurifier_AttrDef_CSS_Ident extends HTMLPurifier_AttrDef
+{
+
+ /**
+ * @param string $string
+ * @param HTMLPurifier_Config $config
+ * @param HTMLPurifier_Context $context
+ * @return bool|string
+ */
+ public function validate($string, $config, $context)
+ {
+ $string = trim($string);
+
+ // early abort: '' and '0' (strings that convert to false) are invalid
+ if (!$string) {
+ return false;
+ }
+
+ $pattern = '/^(-?[A-Za-z_][A-Za-z_\-0-9]*)$/';
+ if (!preg_match($pattern, $string)) {
+ return false;
+ }
+ return $string;
+ }
+}
+
+// vim: et sw=4 sts=4