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<?php
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/**
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 * Definition that allows a set of elements, and allows no children.
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 * @note This is a hack to reuse code from HTMLPurifier_ChildDef_Required,
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 *       really, one shouldn't inherit from the other.  Only altered behavior
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 *       is to overload a returned false with an array.  Thus, it will never
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 *       return false.
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 */
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class HTMLPurifier_ChildDef_Optional extends HTMLPurifier_ChildDef_Required
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{
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    /**
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     * @type bool
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     */
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    public $allow_empty = true;
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    /**
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     * @type string
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     */
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    public $type = 'optional';
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    /**
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     * @param array $children
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     * @param HTMLPurifier_Config $config
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     * @param HTMLPurifier_Context $context
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     * @return array
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     */
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    public function validateChildren($children, $config, $context)
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    {
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        $result = parent::validateChildren($children, $config, $context);
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        // we assume that $children is not modified
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        if ($result === false) {
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            if (empty($children)) {
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                return true;
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            } elseif ($this->whitespace) {
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                return $children;
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            } else {
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                return array();
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            }
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        }
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        return $result;
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    }
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}
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// vim: et sw=4 sts=4