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<?php
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/**
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 * Validates the value for the CSS property text-decoration
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 * @note This class could be generalized into a version that acts sort of
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 *       like Enum except you can compound the allowed values.
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 */
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class HTMLPurifier_AttrDef_CSS_TextDecoration extends HTMLPurifier_AttrDef
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{
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    /**
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     * @param string $string
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     * @param HTMLPurifier_Config $config
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     * @param HTMLPurifier_Context $context
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     * @return bool|string
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     */
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    public function validate($string, $config, $context)
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    {
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        static $allowed_values = array(
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            'line-through' => true,
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            'overline' => true,
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            'underline' => true,
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        );
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        $string = strtolower($this->parseCDATA($string));
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        if ($string === 'none') {
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            return $string;
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        }
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        $parts = explode(' ', $string);
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        $final = '';
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        foreach ($parts as $part) {
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            if (isset($allowed_values[$part])) {
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                $final .= $part . ' ';
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            }
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        }
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        $final = rtrim($final);
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        if ($final === '') {
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            return false;
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        }
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        return $final;
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    }
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}
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// vim: et sw=4 sts=4