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-rw-r--r--library/HTMLPurifier/ChildDef/Optional.php26
1 files changed, 26 insertions, 0 deletions
diff --git a/library/HTMLPurifier/ChildDef/Optional.php b/library/HTMLPurifier/ChildDef/Optional.php
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+++ b/library/HTMLPurifier/ChildDef/Optional.php
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+<?php
+
+/**
+ * Definition that allows a set of elements, and allows no children.
+ * @note This is a hack to reuse code from HTMLPurifier_ChildDef_Required,
+ * really, one shouldn't inherit from the other. Only altered behavior
+ * is to overload a returned false with an array. Thus, it will never
+ * return false.
+ */
+class HTMLPurifier_ChildDef_Optional extends HTMLPurifier_ChildDef_Required
+{
+ public $allow_empty = true;
+ public $type = 'optional';
+ public function validateChildren($tokens_of_children, $config, $context) {
+ $result = parent::validateChildren($tokens_of_children, $config, $context);
+ // we assume that $tokens_of_children is not modified
+ if ($result === false) {
+ if (empty($tokens_of_children)) return true;
+ elseif ($this->whitespace) return $tokens_of_children;
+ else return array();
+ }
+ return $result;
+ }
+}
+
+// vim: et sw=4 sts=4