htmlpurifier/library/HTMLPurifier/AttrDef/CSS/Ratio.php

<?php

/**
 * Validates a ratio as defined by the CSS spec.
 */
class HTMLPurifier_AttrDef_CSS_Ratio extends HTMLPurifier_AttrDef
{
    /**
     * @param   string               $ratio   Ratio to validate
     * @param   HTMLPurifier_Config  $config  Configuration options
     * @param   HTMLPurifier_Context $context Context
     *
     * @return  string|boolean
     *
     * @warning Some contexts do not pass $config, $context. These
     *          variables should not be used without checking HTMLPurifier_Length
     */
    public function validate($ratio, $config, $context)
    {
        $ratio = $this->parseCDATA($ratio);

        $parts = explode('/', $ratio, 2);
        $length = count($parts);

        if ($length < 1 || $length > 2) {
            return false;
        }

        $num = new \HTMLPurifier_AttrDef_CSS_Number();

        if ($length === 1) {
            return $num->validate($parts[0], $config, $context);
        }

        $num1 = $num->validate($parts[0], $config, $context);
        $num2 = $num->validate($parts[1], $config, $context);

        if ($num1 === false || $num2 === false) {
            return false;
        }

        return $num1 . '/' . $num2;
    }
}

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