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<?php
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/**
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 * Validates a MultiLength as defined by the HTML spec.
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 *
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 * A multilength is either a integer (pixel count), a percentage, or
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 * a relative number.
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 */
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class HTMLPurifier_AttrDef_HTML_MultiLength extends HTMLPurifier_AttrDef_HTML_Length
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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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        $string = trim($string);
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        if ($string === '') {
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            return false;
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        }
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        $parent_result = parent::validate($string, $config, $context);
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        if ($parent_result !== false) {
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            return $parent_result;
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        }
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        $length = strlen($string);
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        $last_char = $string[$length - 1];
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        if ($last_char !== '*') {
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            return false;
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        }
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        $int = substr($string, 0, $length - 1);
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        if ($int == '') {
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            return '*';
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        }
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        if (!is_numeric($int)) {
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            return false;
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        }
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        $int = (int)$int;
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        if ($int < 0) {
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            return false;
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        }
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        if ($int == 0) {
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            return '0';
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        }
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        if ($int == 1) {
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            return '*';
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        }
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        return ((string)$int) . '*';
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    }
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}
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// vim: et sw=4 sts=4